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- Bug fixes for general core bugs in 4.2.x will end 22 April 2024 (12 months).
- Bug fixes for security issues in 4.2.x will end 7 October 2024 (18 months).
- PHP version: minimum PHP 8.0.0 Note: minimum PHP version has increased since Moodle 4.1. PHP 8.1.x is supported too.
/lib/ -> filelib.php (source)
<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Functions for file handling.
*
* @package core_files
* @copyright 1999 onwards Martin Dougiamas (http://dougiamas.com)
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
* BYTESERVING_BOUNDARY - string unique string constant.
*/
define('BYTESERVING_BOUNDARY', 's1k2o3d4a5k6s7');
/**
* Do not process file merging when working with draft area files.
*/
define('IGNORE_FILE_MERGE', -1);
/**
* Unlimited area size constant
*/
define('FILE_AREA_MAX_BYTES_UNLIMITED', -1);
/**
* Capacity of the draft area bucket when using the leaking bucket technique to limit the draft upload rate.
*/
define('DRAFT_AREA_BUCKET_CAPACITY', 50);
/**
* Leaking rate of the draft area bucket when using the leaking bucket technique to limit the draft upload rate.
*/
define('DRAFT_AREA_BUCKET_LEAK', 0.2);
require_once("$CFG->libdir/filestorage/file_exceptions.php");
require_once("$CFG->libdir/filestorage/file_storage.php");
require_once("$CFG->libdir/filestorage/zip_packer.php");
require_once("$CFG->libdir/filebrowser/file_browser.php");
/**
* Encodes file serving url
*
* @deprecated use moodle_url factory methods instead
*
* @todo MDL-31071 deprecate this function
* @global stdClass $CFG
* @param string $urlbase
* @param string $path /filearea/itemid/dir/dir/file.exe
* @param bool $forcedownload
* @param bool $https https url required
* @return string encoded file url
*/
function file_encode_url($urlbase, $path, $forcedownload=false, $https=false) {
global $CFG;
//TODO: deprecate this
if ($CFG->slasharguments) {
$parts = explode('/', $path);
$parts = array_map('rawurlencode', $parts);
$path = implode('/', $parts);
$return = $urlbase.$path;
if ($forcedownload) {
$return .= '?forcedownload=1';
}
} else {
$path = rawurlencode($path);
$return = $urlbase.'?file='.$path;
if ($forcedownload) {
$return .= '&forcedownload=1';
}
}
if ($https) {
$return = str_replace('http://', 'https://', $return);
}
return $return;
}
/**
* Detects if area contains subdirs,
* this is intended for file areas that are attached to content
* migrated from 1.x where subdirs were allowed everywhere.
*
* @param context $context
* @param string $component
* @param string $filearea
* @param string $itemid
* @return bool
*/
function file_area_contains_subdirs(context $context, $component, $filearea, $itemid) {
global $DB;
if (!isset($itemid)) {
// Not initialised yet.
return false;
}
// Detect if any directories are already present, this is necessary for content upgraded from 1.x.
$select = "contextid = :contextid AND component = :component AND filearea = :filearea AND itemid = :itemid AND filepath <> '/' AND filename = '.'";
$params = array('contextid'=>$context->id, 'component'=>$component, 'filearea'=>$filearea, 'itemid'=>$itemid);
return $DB->record_exists_select('files', $select, $params);
}
/**
* Prepares 'editor' formslib element from data in database
*
* The passed $data record must contain field foobar, foobarformat and optionally foobartrust. This
* function then copies the embedded files into draft area (assigning itemids automatically),
* creates the form element foobar_editor and rewrites the URLs so the embedded images can be
* displayed.
* In your mform definition, you must have an 'editor' element called foobar_editor. Then you call
* your mform's set_data() supplying the object returned by this function.
*
* @category files
* @param stdClass $data database field that holds the html text with embedded media
* @param string $field the name of the database field that holds the html text with embedded media
* @param array $options editor options (like maxifiles, maxbytes etc.)
* @param stdClass $context context of the editor
* @param string $component
* @param string $filearea file area name
* @param int $itemid item id, required if item exists
* @return stdClass modified data object
*/
function file_prepare_standard_editor($data, $field, array $options, $context=null, $component=null, $filearea=null, $itemid=null) {
$options = (array)$options;
if (!isset($options['trusttext'])) {
$options['trusttext'] = false;
}
if (!isset($options['forcehttps'])) {
$options['forcehttps'] = false;
}
if (!isset($options['subdirs'])) {
$options['subdirs'] = false;
}
if (!isset($options['maxfiles'])) {
$options['maxfiles'] = 0; // no files by default
}
if (!isset($options['noclean'])) {
$options['noclean'] = false;
}
//sanity check for passed context. This function doesn't expect $option['context'] to be set
//But this function is called before creating editor hence, this is one of the best places to check
//if context is used properly. This check notify developer that they missed passing context to editor.
if (isset($context) && !isset($options['context'])) {
//if $context is not null then make sure $option['context'] is also set.
debugging('Context for editor is not set in editoroptions. Hence editor will not respect editor filters', DEBUG_DEVELOPER);
} else if (isset($options['context']) && isset($context)) {
//If both are passed then they should be equal.
if ($options['context']->id != $context->id) {
$exceptionmsg = 'Editor context ['.$options['context']->id.'] is not equal to passed context ['.$context->id.']';
throw new coding_exception($exceptionmsg);
}
}
if (is_null($itemid) or is_null($context)) {
$contextid = null;
$itemid = null;
if (!isset($data)) {
$data = new stdClass();
}
if (!isset($data->{$field})) {
$data->{$field} = '';
}
if (!isset($data->{$field.'format'})) {
$data->{$field.'format'} = editors_get_preferred_format();
}
if (!$options['noclean']) {
if ($data->{$field.'format'} != FORMAT_MARKDOWN) {
$data->{$field} = clean_text($data->{$field}, $data->{$field . 'format'});
}
}
} else {
if ($options['trusttext']) {
// noclean ignored if trusttext enabled
if (!isset($data->{$field.'trust'})) {
$data->{$field.'trust'} = 0;
}
$data = trusttext_pre_edit($data, $field, $context);
} else {
if (!$options['noclean']) {
// We do not have a way to sanitise Markdown texts,
// luckily editors for this format should not have XSS problems.
if ($data->{$field.'format'} != FORMAT_MARKDOWN) {
$data->{$field} = clean_text($data->{$field}, $data->{$field.'format'});
}
}
}
$contextid = $context->id;
}
if ($options['maxfiles'] != 0) {
$draftid_editor = file_get_submitted_draft_itemid($field);
$currenttext = file_prepare_draft_area($draftid_editor, $contextid, $component, $filearea, $itemid, $options, $data->{$field});
$data->{$field.'_editor'} = array('text'=>$currenttext, 'format'=>$data->{$field.'format'}, 'itemid'=>$draftid_editor);
} else {
$data->{$field.'_editor'} = array('text'=>$data->{$field}, 'format'=>$data->{$field.'format'}, 'itemid'=>0);
}
return $data;
}
/**
* Prepares the content of the 'editor' form element with embedded media files to be saved in database
*
* This function moves files from draft area to the destination area and
* encodes URLs to the draft files so they can be safely saved into DB. The
* form has to contain the 'editor' element named foobar_editor, where 'foobar'
* is the name of the database field to hold the wysiwyg editor content. The
* editor data comes as an array with text, format and itemid properties. This
* function automatically adds $data properties foobar, foobarformat and
* foobartrust, where foobar has URL to embedded files encoded.
*
* @category files
* @param stdClass $data raw data submitted by the form
* @param string $field name of the database field containing the html with embedded media files
* @param array $options editor options (trusttext, subdirs, maxfiles, maxbytes etc.)
* @param stdClass $context context, required for existing data
* @param string $component file component
* @param string $filearea file area name
* @param int $itemid item id, required if item exists
* @return stdClass modified data object
*/
function file_postupdate_standard_editor($data, $field, array $options, $context, $component=null, $filearea=null, $itemid=null) {
$options = (array)$options;
if (!isset($options['trusttext'])) {
$options['trusttext'] = false;
}
if (!isset($options['forcehttps'])) {
$options['forcehttps'] = false;
}
if (!isset($options['subdirs'])) {
$options['subdirs'] = false;
}
if (!isset($options['maxfiles'])) {
$options['maxfiles'] = 0; // no files by default
}
if (!isset($options['maxbytes'])) {
$options['maxbytes'] = 0; // unlimited
}
if (!isset($options['removeorphaneddrafts'])) {
$options['removeorphaneddrafts'] = false; // Don't remove orphaned draft files by default.
}
if ($options['trusttext']) {
$data->{$field.'trust'} = trusttext_trusted($context);
} else {
$data->{$field.'trust'} = 0;
}
$editor = $data->{$field.'_editor'};
if ($options['maxfiles'] == 0 or is_null($filearea) or is_null($itemid) or empty($editor['itemid'])) {
$data->{$field} = $editor['text'];
} else {
// Clean the user drafts area of any files not referenced in the editor text.
if ($options['removeorphaneddrafts']) {
file_remove_editor_orphaned_files($editor);
}
$data->{$field} = file_save_draft_area_files($editor['itemid'], $context->id, $component, $filearea, $itemid, $options, $editor['text'], $options['forcehttps']);
}
$data->{$field.'format'} = $editor['format'];
return $data;
}
/**
* Saves text and files modified by Editor formslib element
*
* @category files
* @param stdClass $data $database entry field
* @param string $field name of data field
* @param array $options various options
* @param stdClass $context context - must already exist
* @param string $component
* @param string $filearea file area name
* @param int $itemid must already exist, usually means data is in db
* @return stdClass modified data obejct
*/
function file_prepare_standard_filemanager($data, $field, array $options, $context=null, $component=null, $filearea=null, $itemid=null) {
$options = (array)$options;
if (!isset($options['subdirs'])) {
$options['subdirs'] = false;
}
if (is_null($itemid) or is_null($context)) {
$itemid = null;
$contextid = null;
} else {
$contextid = $context->id;
}
$draftid_editor = file_get_submitted_draft_itemid($field.'_filemanager');
file_prepare_draft_area($draftid_editor, $contextid, $component, $filearea, $itemid, $options);
$data->{$field.'_filemanager'} = $draftid_editor;
return $data;
}
/**
* Saves files modified by File manager formslib element
*
* @todo MDL-31073 review this function
* @category files
* @param stdClass $data $database entry field
* @param string $field name of data field
* @param array $options various options
* @param stdClass $context context - must already exist
* @param string $component
* @param string $filearea file area name
* @param int $itemid must already exist, usually means data is in db
* @return stdClass modified data obejct
*/
function file_postupdate_standard_filemanager($data, $field, array $options, $context, $component, $filearea, $itemid) {
$options = (array)$options;
if (!isset($options['subdirs'])) {
$options['subdirs'] = false;
}
if (!isset($options['maxfiles'])) {
$options['maxfiles'] = -1; // unlimited
}
if (!isset($options['maxbytes'])) {
$options['maxbytes'] = 0; // unlimited
}
if (empty($data->{$field.'_filemanager'})) {
$data->$field = '';
} else {
file_save_draft_area_files($data->{$field.'_filemanager'}, $context->id, $component, $filearea, $itemid, $options);
$fs = get_file_storage();
if ($fs->get_area_files($context->id, $component, $filearea, $itemid)) {
$data->$field = '1'; // TODO: this is an ugly hack (skodak)
} else {
$data->$field = '';
}
}
return $data;
}
/**
* Generate a draft itemid
*
* @category files
* @global moodle_database $DB
* @global stdClass $USER
* @return int a random but available draft itemid that can be used to create a new draft
* file area.
*/
function file_get_unused_draft_itemid() {
global $DB, $USER;
if (isguestuser() or !isloggedin()) {
// guests and not-logged-in users can not be allowed to upload anything!!!!!!
throw new \moodle_exception('noguest');
}
$contextid = context_user::instance($USER->id)->id;
$fs = get_file_storage();
$draftitemid = rand(1, 999999999);
while ($files = $fs->get_area_files($contextid, 'user', 'draft', $draftitemid)) {
$draftitemid = rand(1, 999999999);
}
return $draftitemid;
}
/**
* Initialise a draft file area from a real one by copying the files. A draft
* area will be created if one does not already exist. Normally you should
* get $draftitemid by calling file_get_submitted_draft_itemid('elementname');
*
* @category files
* @global stdClass $CFG
* @global stdClass $USER
* @param int $draftitemid the id of the draft area to use, or 0 to create a new one, in which case this parameter is updated.
* @param int $contextid This parameter and the next two identify the file area to copy files from.
* @param string $component
* @param string $filearea helps indentify the file area.
* @param int $itemid helps identify the file area. Can be null if there are no files yet.
* @param array $options text and file options ('subdirs'=>false, 'forcehttps'=>false)
* @param string $text some html content that needs to have embedded links rewritten to point to the draft area.
* @return string|null returns string if $text was passed in, the rewritten $text is returned. Otherwise NULL.
*/
function file_prepare_draft_area(&$draftitemid, $contextid, $component, $filearea, $itemid, array $options=null, $text=null) {
global $CFG, $USER;
$options = (array)$options;
if (!isset($options['subdirs'])) {
$options['subdirs'] = false;
}
if (!isset($options['forcehttps'])) {
$options['forcehttps'] = false;
}
$usercontext = context_user::instance($USER->id);
$fs = get_file_storage();
if (empty($draftitemid)) {
// create a new area and copy existing files into
$draftitemid = file_get_unused_draft_itemid();
$file_record = array('contextid'=>$usercontext->id, 'component'=>'user', 'filearea'=>'draft', 'itemid'=>$draftitemid);
if (!is_null($itemid) and $files = $fs->get_area_files($contextid, $component, $filearea, $itemid)) {
foreach ($files as $file) {
if ($file->is_directory() and $file->get_filepath() === '/') {
// we need a way to mark the age of each draft area,
// by not copying the root dir we force it to be created automatically with current timestamp
continue;
}
if (!$options['subdirs'] and ($file->is_directory() or $file->get_filepath() !== '/')) {
continue;
}
$draftfile = $fs->create_file_from_storedfile($file_record, $file);
// XXX: This is a hack for file manager (MDL-28666)
// File manager needs to know the original file information before copying
// to draft area, so we append these information in mdl_files.source field
// {@link file_storage::search_references()}
// {@link file_storage::search_references_count()}
$sourcefield = $file->get_source();
$newsourcefield = new stdClass;
$newsourcefield->source = $sourcefield;
$original = new stdClass;
$original->contextid = $contextid;
$original->component = $component;
$original->filearea = $filearea;
$original->itemid = $itemid;
$original->filename = $file->get_filename();
$original->filepath = $file->get_filepath();
$newsourcefield->original = file_storage::pack_reference($original);
$draftfile->set_source(serialize($newsourcefield));
// End of file manager hack
}
}
if (!is_null($text)) {
// at this point there should not be any draftfile links yet,
// because this is a new text from database that should still contain the @@pluginfile@@ links
// this happens when developers forget to post process the text
$text = str_replace("\"$CFG->wwwroot/draftfile.php", "\"$CFG->wwwroot/brokenfile.php#", $text);
}
} else {
// nothing to do
}
if (is_null($text)) {
return null;
}
// relink embedded files - editor can not handle @@PLUGINFILE@@ !
return file_rewrite_pluginfile_urls($text, 'draftfile.php', $usercontext->id, 'user', 'draft', $draftitemid, $options);
}
/**
* Convert encoded URLs in $text from the @@PLUGINFILE@@/... form to an actual URL.
* Passing a new option reverse = true in the $options var will make the function to convert actual URLs in $text to encoded URLs
* in the @@PLUGINFILE@@ form.
*
* @param string $text The content that may contain ULRs in need of rewriting.
* @param string $file The script that should be used to serve these files. pluginfile.php, draftfile.php, etc.
* @param int $contextid This parameter and the next two identify the file area to use.
* @param string $component
* @param string $filearea helps identify the file area.
* @param int $itemid helps identify the file area.
* @param array $options
* bool $options.forcehttps Force the user of https
* bool $options.reverse Reverse the behaviour of the function
* mixed $options.includetoken Use a token for authentication. True for current user, int value for other user id.
* string The processed text.
*/
function file_rewrite_pluginfile_urls($text, $file, $contextid, $component, $filearea, $itemid, array $options=null) {
global $CFG, $USER;
$options = (array)$options;
if (!isset($options['forcehttps'])) {
$options['forcehttps'] = false;
}
$baseurl = "{$CFG->wwwroot}/{$file}";
if (!empty($options['includetoken'])) {
$userid = $options['includetoken'] === true ? $USER->id : $options['includetoken'];
$token = get_user_key('core_files', $userid);
$finalfile = basename($file);
$tokenfile = "token{$finalfile}";
$file = substr($file, 0, strlen($file) - strlen($finalfile)) . $tokenfile;
$baseurl = "{$CFG->wwwroot}/{$file}";
if (!$CFG->slasharguments) {
$baseurl .= "?token={$token}&file=";
} else {
$baseurl .= "/{$token}";
}
}
$baseurl .= "/{$contextid}/{$component}/{$filearea}/";
if ($itemid !== null) {
$baseurl .= "$itemid/";
}
if ($options['forcehttps']) {
$baseurl = str_replace('http://', 'https://', $baseurl);
}
if (!empty($options['reverse'])) {
return str_replace($baseurl, '@@PLUGINFILE@@/', $text ?? '');
} else {
return str_replace('@@PLUGINFILE@@/', $baseurl, $text ?? '');
}
}
/**
* Returns information about files in a draft area.
*
* @global stdClass $CFG
* @global stdClass $USER
* @param int $draftitemid the draft area item id.
* @param string $filepath path to the directory from which the information have to be retrieved.
* @return array with the following entries:
* 'filecount' => number of files in the draft area.
* 'filesize' => total size of the files in the draft area.
* 'foldercount' => number of folders in the draft area.
* 'filesize_without_references' => total size of the area excluding file references.
* (more information will be added as needed).
*/
function file_get_draft_area_info($draftitemid, $filepath = '/') {
global $USER;
$usercontext = context_user::instance($USER->id);
return file_get_file_area_info($usercontext->id, 'user', 'draft', $draftitemid, $filepath);
}
/**
* Returns information about files in an area.
*
* @param int $contextid context id
* @param string $component component
* @param string $filearea file area name
* @param int $itemid item id or all files if not specified
* @param string $filepath path to the directory from which the information have to be retrieved.
* @return array with the following entries:
* 'filecount' => number of files in the area.
* 'filesize' => total size of the files in the area.
* 'foldercount' => number of folders in the area.
* 'filesize_without_references' => total size of the area excluding file references.
* @since Moodle 3.4
*/
function file_get_file_area_info($contextid, $component, $filearea, $itemid = 0, $filepath = '/') {
$fs = get_file_storage();
$results = array(
'filecount' => 0,
'foldercount' => 0,
'filesize' => 0,
'filesize_without_references' => 0
);
$draftfiles = $fs->get_directory_files($contextid, $component, $filearea, $itemid, $filepath, true, true);
foreach ($draftfiles as $file) {
if ($file->is_directory()) {
$results['foldercount'] += 1;
} else {
$results['filecount'] += 1;
}
$filesize = $file->get_filesize();
$results['filesize'] += $filesize;
if (!$file->is_external_file()) {
$results['filesize_without_references'] += $filesize;
}
}
return $results;
}
/**
* Returns whether a draft area has exceeded/will exceed its size limit.
*
* Please note that the unlimited value for $areamaxbytes is -1 {@link FILE_AREA_MAX_BYTES_UNLIMITED}, not 0.
*
* @param int $draftitemid the draft area item id.
* @param int $areamaxbytes the maximum size allowed in this draft area.
* @param int $newfilesize the size that would be added to the current area.
* @param bool $includereferences true to include the size of the references in the area size.
* @return bool true if the area will/has exceeded its limit.
* @since Moodle 2.4
*/
function file_is_draft_area_limit_reached($draftitemid, $areamaxbytes, $newfilesize = 0, $includereferences = false) {
if ($areamaxbytes != FILE_AREA_MAX_BYTES_UNLIMITED) {
$draftinfo = file_get_draft_area_info($draftitemid);
$areasize = $draftinfo['filesize_without_references'];
if ($includereferences) {
$areasize = $draftinfo['filesize'];
}
if ($areasize + $newfilesize > $areamaxbytes) {
return true;
}
}
return false;
}
/**
* Returns whether a user has reached their draft area upload rate.
*
* @param int $userid The user id
* @return bool
*/
function file_is_draft_areas_limit_reached(int $userid): bool {
global $CFG;
$capacity = $CFG->draft_area_bucket_capacity ?? DRAFT_AREA_BUCKET_CAPACITY;
$leak = $CFG->draft_area_bucket_leak ?? DRAFT_AREA_BUCKET_LEAK;
$since = time() - floor($capacity / $leak); // The items that were in the bucket before this time are already leaked by now.
// We are going to be a bit generous to the user when using the leaky bucket
// algorithm below. We are going to assume that the bucket is empty at $since.
// We have to do an assumption here unless we really want to get ALL user's draft
// items without any limit and put all of them in the leaking bucket.
// I decided to favour performance over accuracy here.
$fs = get_file_storage();
$items = $fs->get_user_draft_items($userid, $since);
$items = array_reverse($items); // So that the items are sorted based on time in the ascending direction.
// We only need to store the time that each element in the bucket is going to leak. So $bucket is array of leaking times.
$bucket = [];
foreach ($items as $item) {
$now = $item->timemodified;
// First let's see if items can be dropped from the bucket as a result of leakage.
while (!empty($bucket) && ($now >= $bucket[0])) {
array_shift($bucket);
}
// Calculate the time that the new item we put into the bucket will be leaked from it, and store it into the bucket.
if ($bucket) {
$bucket[] = max($bucket[count($bucket) - 1], $now) + (1 / $leak);
} else {
$bucket[] = $now + (1 / $leak);
}
}
// Recalculate the bucket's content based on the leakage until now.
$now = time();
while (!empty($bucket) && ($now >= $bucket[0])) {
array_shift($bucket);
}
return count($bucket) >= $capacity;
}
/**
* Get used space of files
* @global moodle_database $DB
* @global stdClass $USER
* @return int total bytes
*/
function file_get_user_used_space() {
global $DB, $USER;
$usercontext = context_user::instance($USER->id);
$sql = "SELECT SUM(files1.filesize) AS totalbytes FROM {files} files1
JOIN (SELECT contenthash, filename, MAX(id) AS id
FROM {files}
WHERE contextid = ? AND component = ? AND filearea != ?
GROUP BY contenthash, filename) files2 ON files1.id = files2.id";
$params = array('contextid'=>$usercontext->id, 'component'=>'user', 'filearea'=>'draft');
$record = $DB->get_record_sql($sql, $params);
return (int)$record->totalbytes;
}
/**
* Convert any string to a valid filepath
* @todo review this function
* @param string $str
* @return string path
*/
function file_correct_filepath($str) { //TODO: what is this? (skodak) - No idea (Fred)
if ($str == '/' or empty($str)) {
return '/';
} else {
return '/'.trim($str, '/').'/';
}
}
/**
* Generate a folder tree of draft area of current USER recursively
*
* @todo MDL-31073 use normal return value instead, this does not fit the rest of api here (skodak)
* @param int $draftitemid
* @param string $filepath
* @param mixed $data
*/
function file_get_drafarea_folders($draftitemid, $filepath, &$data) {
global $USER, $OUTPUT, $CFG;
$data->children = array();
$context = context_user::instance($USER->id);
$fs = get_file_storage();
if ($files = $fs->get_directory_files($context->id, 'user', 'draft', $draftitemid, $filepath, false)) {
foreach ($files as $file) {
if ($file->is_directory()) {
$item = new stdClass();
$item->sortorder = $file->get_sortorder();
$item->filepath = $file->get_filepath();
$foldername = explode('/', trim($item->filepath, '/'));
$item->fullname = trim(array_pop($foldername), '/');
$item->id = uniqid();
file_get_drafarea_folders($draftitemid, $item->filepath, $item);
$data->children[] = $item;
} else {
continue;
}
}
}
}
/**
* Listing all files (including folders) in current path (draft area)
* used by file manager
* @param int $draftitemid
* @param string $filepath
* @return stdClass
*/
function file_get_drafarea_files($draftitemid, $filepath = '/') {
global $USER, $OUTPUT, $CFG;
$context = context_user::instance($USER->id);
$fs = get_file_storage();
$data = new stdClass();
$data->path = array();
$data->path[] = array('name'=>get_string('files'), 'path'=>'/');
// will be used to build breadcrumb
$trail = '/';
if ($filepath !== '/') {
$filepath = file_correct_filepath($filepath);
$parts = explode('/', $filepath);
foreach ($parts as $part) {
if ($part != '' && $part != null) {
$trail .= ($part.'/');
$data->path[] = array('name'=>$part, 'path'=>$trail);
}
}
}
$list = array();
$maxlength = 12;
if ($files = $fs->get_directory_files($context->id, 'user', 'draft', $draftitemid, $filepath, false)) {
foreach ($files as $file) {
$item = new stdClass();
$item->filename = $file->get_filename();
$item->filepath = $file->get_filepath();
$item->fullname = trim($item->filename, '/');
$filesize = $file->get_filesize();
$item->size = $filesize ? $filesize : null;
$item->filesize = $filesize ? display_size($filesize) : '';
$item->sortorder = $file->get_sortorder();
$item->author = $file->get_author();
$item->license = $file->get_license();
$item->datemodified = $file->get_timemodified();
$item->datecreated = $file->get_timecreated();
$item->isref = $file->is_external_file();
if ($item->isref && $file->get_status() == 666) {
$item->originalmissing = true;
}
// find the file this draft file was created from and count all references in local
// system pointing to that file
$source = @unserialize($file->get_source() ?? '');
if (isset($source->original)) {
$item->refcount = $fs->search_references_count($source->original);
}
if ($file->is_directory()) {
$item->filesize = 0;
< $item->icon = $OUTPUT->image_url(file_folder_icon(24))->out(false);
> $item->icon = $OUTPUT->image_url(file_folder_icon())->out(false);
$item->type = 'folder';
$foldername = explode('/', trim($item->filepath, '/'));
$item->fullname = trim(array_pop($foldername), '/');
< $item->thumbnail = $OUTPUT->image_url(file_folder_icon(90))->out(false);
> $item->thumbnail = $OUTPUT->image_url(file_folder_icon())->out(false);
} else {
// do NOT use file browser here!
$item->mimetype = get_mimetype_description($file);
if (file_extension_in_typegroup($file->get_filename(), 'archive')) {
$item->type = 'zip';
} else {
$item->type = 'file';
}
$itemurl = moodle_url::make_draftfile_url($draftitemid, $item->filepath, $item->filename);
$item->url = $itemurl->out();
< $item->icon = $OUTPUT->image_url(file_file_icon($file, 24))->out(false);
< $item->thumbnail = $OUTPUT->image_url(file_file_icon($file, 90))->out(false);
> $item->icon = $OUTPUT->image_url(file_file_icon($file))->out(false);
> $item->thumbnail = $OUTPUT->image_url(file_file_icon($file))->out(false);
// The call to $file->get_imageinfo() fails with an exception if the file can't be read on the file system.
// We still want to add such files to the list, so the owner can view and delete them if needed. So, we only call
// get_imageinfo() on files that can be read, and we also spoof the file status based on whether it was found.
// We'll use the same status types used by stored_file->get_status(), where 0 = OK. 1 = problem, as these will be
// used by the widget to display a warning about the problem files.
// The value of stored_file->get_status(), and the file record are unaffected by this. It's only superficially set.
$item->status = $fs->get_file_system()->is_file_readable_remotely_by_storedfile($file) ? 0 : 1;
if ($item->status == 0) {
if ($imageinfo = $file->get_imageinfo()) {
$item->realthumbnail = $itemurl->out(false, array('preview' => 'thumb',
'oid' => $file->get_timemodified()));
$item->realicon = $itemurl->out(false, array('preview' => 'tinyicon', 'oid' => $file->get_timemodified()));
$item->image_width = $imageinfo['width'];
$item->image_height = $imageinfo['height'];
}
}
}
$list[] = $item;
}
}
$data->itemid = $draftitemid;
$data->list = $list;
return $data;
}
/**
* Returns all of the files in the draftarea.
*
* @param int $draftitemid The draft item ID
* @param string $filepath path for the uploaded files.
* @return array An array of files associated with this draft item id.
*/
function file_get_all_files_in_draftarea(int $draftitemid, string $filepath = '/') : array {
$files = [];
$draftfiles = file_get_drafarea_files($draftitemid, $filepath);
file_get_drafarea_folders($draftitemid, $filepath, $draftfiles);
if (!empty($draftfiles)) {
foreach ($draftfiles->list as $draftfile) {
if ($draftfile->type == 'file') {
$files[] = $draftfile;
}
}
if (isset($draftfiles->children)) {
foreach ($draftfiles->children as $draftfile) {
$files = array_merge($files, file_get_all_files_in_draftarea($draftitemid, $draftfile->filepath));
}
}
}
return $files;
}
/**
* Returns draft area itemid for a given element.
*
* @category files
* @param string $elname name of formlib editor element, or a hidden form field that stores the draft area item id, etc.
* @return int the itemid, or 0 if there is not one yet.
*/
function file_get_submitted_draft_itemid($elname) {
// this is a nasty hack, ideally all new elements should use arrays here or there should be a new parameter
if (!isset($_REQUEST[$elname])) {
return 0;
}
if (is_array($_REQUEST[$elname])) {
$param = optional_param_array($elname, 0, PARAM_INT);
if (!empty($param['itemid'])) {
$param = $param['itemid'];
} else {
debugging('Missing itemid, maybe caused by unset maxfiles option', DEBUG_DEVELOPER);
return false;
}
} else {
$param = optional_param($elname, 0, PARAM_INT);
}
if ($param) {
require_sesskey();
}
return $param;
}
/**
* Restore the original source field from draft files
*
* Do not use this function because it makes field files.source inconsistent
* for draft area files. This function will be deprecated in 2.6
*
* @param stored_file $storedfile This only works with draft files
* @return stored_file
*/
function file_restore_source_field_from_draft_file($storedfile) {
$source = @unserialize($storedfile->get_source() ?? '');
if (!empty($source)) {
if (is_object($source)) {
$restoredsource = $source->source;
$storedfile->set_source($restoredsource);
} else {
throw new moodle_exception('invalidsourcefield', 'error');
}
}
return $storedfile;
}
/**
* Removes those files from the user drafts filearea which are not referenced in the editor text.
*
* @param stdClass $editor The online text editor element from the submitted form data.
*/
function file_remove_editor_orphaned_files($editor) {
global $CFG, $USER;
// Find those draft files included in the text, and generate their hashes.
$context = context_user::instance($USER->id);
$baseurl = $CFG->wwwroot . '/draftfile.php/' . $context->id . '/user/draft/' . $editor['itemid'] . '/';
$pattern = "/" . preg_quote($baseurl, '/') . "(.+?)[\?\"'<>\s:\\\\]/";
preg_match_all($pattern, $editor['text'], $matches);
$usedfilehashes = [];
foreach ($matches[1] as $matchedfilename) {
$matchedfilename = urldecode($matchedfilename);
$usedfilehashes[] = \file_storage::get_pathname_hash($context->id, 'user', 'draft', $editor['itemid'], '/',
$matchedfilename);
}
// Now, compare the hashes of all draft files, and remove those which don't match used files.
$fs = get_file_storage();
$files = $fs->get_area_files($context->id, 'user', 'draft', $editor['itemid'], 'id', false);
foreach ($files as $file) {
$tmphash = $file->get_pathnamehash();
if (!in_array($tmphash, $usedfilehashes)) {
$file->delete();
}
}
}
/**
* Finds all draft areas used in a textarea and copies the files into the primary textarea. If a user copies and pastes
* content from another draft area it's possible for a single textarea to reference multiple draft areas.
*
* @category files
* @param int $draftitemid the id of the primary draft area.
* When set to -1 (probably, by a WebService) it won't process file merging, keeping the original state of the file area.
* @param int $usercontextid the user's context id.
* @param string $text some html content that needs to have files copied to the correct draft area.
* @param bool $forcehttps force https urls.
*
* @return string $text html content modified with new draft links
*/
function file_merge_draft_areas($draftitemid, $usercontextid, $text, $forcehttps = false) {
if (is_null($text)) {
return null;
}
// Do not merge files, leave it as it was.
if ($draftitemid === IGNORE_FILE_MERGE) {
return null;
}
$urls = extract_draft_file_urls_from_text($text, $forcehttps, $usercontextid, 'user', 'draft');
// No draft areas to rewrite.
if (empty($urls)) {
return $text;
}
foreach ($urls as $url) {
// Do not process the "home" draft area.
if ($url['itemid'] == $draftitemid) {
continue;
}
// Decode the filename.
$filename = urldecode($url['filename']);
// Copy the file.
file_copy_file_to_file_area($url, $filename, $draftitemid);
// Rewrite draft area.
$text = file_replace_file_area_in_text($url, $draftitemid, $text, $forcehttps);
}
return $text;
}
/**
* Rewrites a file area in arbitrary text.
*
* @param array $file General information about the file.
* @param int $newid The new file area itemid.
* @param string $text The text to rewrite.
* @param bool $forcehttps force https urls.
* @return string The rewritten text.
*/
function file_replace_file_area_in_text($file, $newid, $text, $forcehttps = false) {
global $CFG;
$wwwroot = $CFG->wwwroot;
if ($forcehttps) {
$wwwroot = str_replace('http://', 'https://', $wwwroot);
}
$search = [
$wwwroot,
$file['urlbase'],
$file['contextid'],
$file['component'],
$file['filearea'],
$file['itemid'],
$file['filename']
];
$replace = [
$wwwroot,
$file['urlbase'],
$file['contextid'],
$file['component'],
$file['filearea'],
$newid,
$file['filename']
];
$text = str_ireplace( implode('/', $search), implode('/', $replace), $text);
return $text;
}
/**
* Copies a file from one file area to another.
*
* @param array $file Information about the file to be copied.
* @param string $filename The filename.
* @param int $itemid The new file area.
*/
function file_copy_file_to_file_area($file, $filename, $itemid) {
$fs = get_file_storage();
// Load the current file in the old draft area.
$fileinfo = array(
'component' => $file['component'],
'filearea' => $file['filearea'],
'itemid' => $file['itemid'],
'contextid' => $file['contextid'],
'filepath' => '/',
'filename' => $filename
);
$oldfile = $fs->get_file($fileinfo['contextid'], $fileinfo['component'], $fileinfo['filearea'],
$fileinfo['itemid'], $fileinfo['filepath'], $fileinfo['filename']);
$newfileinfo = array(
'component' => $file['component'],
'filearea' => $file['filearea'],
'itemid' => $itemid,
'contextid' => $file['contextid'],
'filepath' => '/',
'filename' => $filename
);
$newcontextid = $newfileinfo['contextid'];
$newcomponent = $newfileinfo['component'];
$newfilearea = $newfileinfo['filearea'];
$newitemid = $newfileinfo['itemid'];
$newfilepath = $newfileinfo['filepath'];
$newfilename = $newfileinfo['filename'];
// Check if the file exists.
if (!$fs->file_exists($newcontextid, $newcomponent, $newfilearea, $newitemid, $newfilepath, $newfilename)) {
$fs->create_file_from_storedfile($newfileinfo, $oldfile);
}
}
/**
* Saves files from a draft file area to a real one (merging the list of files).
* Can rewrite URLs in some content at the same time if desired.
*
* @category files
* @global stdClass $USER
* @param int $draftitemid the id of the draft area to use. Normally obtained
* from file_get_submitted_draft_itemid('elementname') or similar.
* When set to -1 (probably, by a WebService) it won't process file merging, keeping the original state of the file area.
* @param int $contextid This parameter and the next two identify the file area to save to.
* @param string $component
* @param string $filearea indentifies the file area.
* @param int $itemid helps identifies the file area.
* @param array $options area options (subdirs=>false, maxfiles=-1, maxbytes=0)
* @param string $text some html content that needs to have embedded links rewritten
* to the @@PLUGINFILE@@ form for saving in the database.
* @param bool $forcehttps force https urls.
* @return string|null if $text was passed in, the rewritten $text is returned. Otherwise NULL.
*/
function file_save_draft_area_files($draftitemid, $contextid, $component, $filearea, $itemid, array $options=null, $text=null, $forcehttps=false) {
global $USER;
// Do not merge files, leave it as it was.
if ($draftitemid === IGNORE_FILE_MERGE) {
// Safely return $text, no need to rewrite pluginfile because this is mostly comming from an external client like the app.
return $text;
}
if ($itemid === false) {
// Catch a potentially dangerous coding error.
throw new coding_exception('file_save_draft_area_files was called with $itemid false. ' .
"This suggests a bug, because it would wipe all ($contextid, $component, $filearea) files.");
}
$usercontext = context_user::instance($USER->id);
$fs = get_file_storage();
$options = (array)$options;
if (!isset($options['subdirs'])) {
$options['subdirs'] = false;
}
if (!isset($options['maxfiles'])) {
$options['maxfiles'] = -1; // unlimited
}
if (!isset($options['maxbytes']) || $options['maxbytes'] == USER_CAN_IGNORE_FILE_SIZE_LIMITS) {
$options['maxbytes'] = 0; // unlimited
}
if (!isset($options['areamaxbytes'])) {
$options['areamaxbytes'] = FILE_AREA_MAX_BYTES_UNLIMITED; // Unlimited.
}
$allowreferences = true;
if (isset($options['return_types']) && !($options['return_types'] & (FILE_REFERENCE | FILE_CONTROLLED_LINK))) {
// we assume that if $options['return_types'] is NOT specified, we DO allow references.
// this is not exactly right. BUT there are many places in code where filemanager options
// are not passed to file_save_draft_area_files()
$allowreferences = false;
}
// Check if the user has copy-pasted from other draft areas. Those files will be located in different draft
// areas and need to be copied into the current draft area.
$text = file_merge_draft_areas($draftitemid, $usercontext->id, $text, $forcehttps);
// Check if the draft area has exceeded the authorised limit. This should never happen as validation
// should have taken place before, unless the user is doing something nauthly. If so, let's just not save
// anything at all in the next area.
if (file_is_draft_area_limit_reached($draftitemid, $options['areamaxbytes'])) {
return null;
}
$draftfiles = $fs->get_area_files($usercontext->id, 'user', 'draft', $draftitemid, 'id');
$oldfiles = $fs->get_area_files($contextid, $component, $filearea, $itemid, 'id');
// One file in filearea means it is empty (it has only top-level directory '.').
if (count($draftfiles) > 1 || count($oldfiles) > 1) {
// we have to merge old and new files - we want to keep file ids for files that were not changed
// we change time modified for all new and changed files, we keep time created as is
$newhashes = array();
$filecount = 0;
$context = context::instance_by_id($contextid, MUST_EXIST);
foreach ($draftfiles as $file) {
if (!$options['subdirs'] && $file->get_filepath() !== '/') {
continue;
}
if (!$allowreferences && $file->is_external_file()) {
continue;
}
if (!$file->is_directory()) {
// Check to see if this file was uploaded by someone who can ignore the file size limits.
$fileusermaxbytes = get_user_max_upload_file_size($context, $options['maxbytes'], 0, 0, $file->get_userid());
if ($fileusermaxbytes != USER_CAN_IGNORE_FILE_SIZE_LIMITS
&& ($options['maxbytes'] and $options['maxbytes'] < $file->get_filesize())) {
// Oversized file.
continue;
}
if ($options['maxfiles'] != -1 and $options['maxfiles'] <= $filecount) {
// more files - should not get here at all
continue;
}
$filecount++;
}
$newhash = $fs->get_pathname_hash($contextid, $component, $filearea, $itemid, $file->get_filepath(), $file->get_filename());
$newhashes[$newhash] = $file;
}
// Loop through oldfiles and decide which we need to delete and which to update.
// After this cycle the array $newhashes will only contain the files that need to be added.
foreach ($oldfiles as $oldfile) {
$oldhash = $oldfile->get_pathnamehash();
if (!isset($newhashes[$oldhash])) {
// delete files not needed any more - deleted by user
$oldfile->delete();
continue;
}
$newfile = $newhashes[$oldhash];
// Now we know that we have $oldfile and $newfile for the same path.
// Let's check if we can update this file or we need to delete and create.
if ($newfile->is_directory()) {
// Directories are always ok to just update.
} else if (($source = @unserialize($newfile->get_source() ?? '')) && isset($source->original)) {
// File has the 'original' - we need to update the file (it may even have not been changed at all).
$original = file_storage::unpack_reference($source->original);
if ($original['filename'] !== $oldfile->get_filename() || $original['filepath'] !== $oldfile->get_filepath()) {
// Very odd, original points to another file. Delete and create file.
$oldfile->delete();
continue;
}
} else {
// The same file name but absence of 'original' means that file was deteled and uploaded again.
// By deleting and creating new file we properly manage all existing references.
$oldfile->delete();
continue;
}
// status changed, we delete old file, and create a new one
if ($oldfile->get_status() != $newfile->get_status()) {
// file was changed, use updated with new timemodified data
$oldfile->delete();
// This file will be added later
continue;
}
// Updated author
if ($oldfile->get_author() != $newfile->get_author()) {
$oldfile->set_author($newfile->get_author());
}
// Updated license
if ($oldfile->get_license() != $newfile->get_license()) {
$oldfile->set_license($newfile->get_license());
}
// Updated file source
// Field files.source for draftarea files contains serialised object with source and original information.
// We only store the source part of it for non-draft file area.
$newsource = $newfile->get_source();
if ($source = @unserialize($newfile->get_source() ?? '')) {
$newsource = $source->source;
}
if ($oldfile->get_source() !== $newsource) {
$oldfile->set_source($newsource);
}
// Updated sort order
if ($oldfile->get_sortorder() != $newfile->get_sortorder()) {
$oldfile->set_sortorder($newfile->get_sortorder());
}
// Update file timemodified
if ($oldfile->get_timemodified() != $newfile->get_timemodified()) {
$oldfile->set_timemodified($newfile->get_timemodified());
}
// Replaced file content
if (!$oldfile->is_directory() &&
($oldfile->get_contenthash() != $newfile->get_contenthash() ||
$oldfile->get_filesize() != $newfile->get_filesize() ||
$oldfile->get_referencefileid() != $newfile->get_referencefileid() ||
$oldfile->get_userid() != $newfile->get_userid())) {
$oldfile->replace_file_with($newfile);
}
// unchanged file or directory - we keep it as is
unset($newhashes[$oldhash]);
}
// Add fresh file or the file which has changed status
// the size and subdirectory tests are extra safety only, the UI should prevent it
foreach ($newhashes as $file) {
$file_record = array('contextid'=>$contextid, 'component'=>$component, 'filearea'=>$filearea, 'itemid'=>$itemid, 'timemodified'=>time());
if ($source = @unserialize($file->get_source() ?? '')) {
// Field files.source for draftarea files contains serialised object with source and original information.
// We only store the source part of it for non-draft file area.
$file_record['source'] = $source->source;
}
if ($file->is_external_file()) {
$repoid = $file->get_repository_id();
if (!empty($repoid)) {
$context = context::instance_by_id($contextid, MUST_EXIST);
$repo = repository::get_repository_by_id($repoid, $context);
if (!empty($options)) {
$repo->options = $options;
}
$file_record['repositoryid'] = $repoid;
// This hook gives the repo a place to do some house cleaning, and update the $reference before it's saved
// to the file store. E.g. transfer ownership of the file to a system account etc.
$reference = $repo->reference_file_selected($file->get_reference(), $context, $component, $filearea, $itemid);
$file_record['reference'] = $reference;
}
}
$fs->create_file_from_storedfile($file_record, $file);
}
}
// note: do not purge the draft area - we clean up areas later in cron,
// the reason is that user might press submit twice and they would loose the files,
// also sometimes we might want to use hacks that save files into two different areas
if (is_null($text)) {
return null;
} else {
return file_rewrite_urls_to_pluginfile($text, $draftitemid, $forcehttps);
}
}
/**
* Convert the draft file area URLs in some content to @@PLUGINFILE@@ tokens
* ready to be saved in the database. Normally, this is done automatically by
* {@link file_save_draft_area_files()}.
*
* @category files
* @param string $text the content to process.
* @param int $draftitemid the draft file area the content was using.
* @param bool $forcehttps whether the content contains https URLs. Default false.
* @return string the processed content.
*/
function file_rewrite_urls_to_pluginfile($text, $draftitemid, $forcehttps = false) {
global $CFG, $USER;
$usercontext = context_user::instance($USER->id);
$wwwroot = $CFG->wwwroot;
if ($forcehttps) {
$wwwroot = str_replace('http://', 'https://', $wwwroot);
}
// relink embedded files if text submitted - no absolute links allowed in database!
$text = str_ireplace("$wwwroot/draftfile.php/$usercontext->id/user/draft/$draftitemid/", '@@PLUGINFILE@@/', $text);
if (strpos($text, 'draftfile.php?file=') !== false) {
$matches = array();
preg_match_all("!$wwwroot/draftfile.php\?file=%2F{$usercontext->id}%2Fuser%2Fdraft%2F{$draftitemid}%2F[^'\",&<>|`\s:\\\\]+!iu", $text, $matches);
if ($matches) {
foreach ($matches[0] as $match) {
$replace = str_ireplace('%2F', '/', $match);
$text = str_replace($match, $replace, $text);
}
}
$text = str_ireplace("$wwwroot/draftfile.php?file=/$usercontext->id/user/draft/$draftitemid/", '@@PLUGINFILE@@/', $text);
}
return $text;
}
/**
* Set file sort order
*
* @global moodle_database $DB
* @param int $contextid the context id
* @param string $component file component
* @param string $filearea file area.
* @param int $itemid itemid.
* @param string $filepath file path.
* @param string $filename file name.
* @param int $sortorder the sort order of file.
* @return bool
*/
function file_set_sortorder($contextid, $component, $filearea, $itemid, $filepath, $filename, $sortorder) {
global $DB;
$conditions = array('contextid'=>$contextid, 'component'=>$component, 'filearea'=>$filearea, 'itemid'=>$itemid, 'filepath'=>$filepath, 'filename'=>$filename);
if ($file_record = $DB->get_record('files', $conditions)) {
$sortorder = (int)$sortorder;
$file_record->sortorder = $sortorder;
$DB->update_record('files', $file_record);
return true;
}
return false;
}
/**
* reset file sort order number to 0
* @global moodle_database $DB
* @param int $contextid the context id
* @param string $component
* @param string $filearea file area.
* @param int|bool $itemid itemid.
* @return bool
*/
function file_reset_sortorder($contextid, $component, $filearea, $itemid=false) {
global $DB;
$conditions = array('contextid'=>$contextid, 'component'=>$component, 'filearea'=>$filearea);
if ($itemid !== false) {
$conditions['itemid'] = $itemid;
}
$file_records = $DB->get_records('files', $conditions);
foreach ($file_records as $file_record) {
$file_record->sortorder = 0;
$DB->update_record('files', $file_record);
}
return true;
}
/**
* Returns description of upload error
*
* @param int $errorcode found in $_FILES['filename.ext']['error']
* @return string error description string, '' if ok
*/
function file_get_upload_error($errorcode) {
switch ($errorcode) {
case 0: // UPLOAD_ERR_OK - no error
$errmessage = '';
break;
case 1: // UPLOAD_ERR_INI_SIZE
$errmessage = get_string('uploadserverlimit');
break;
case 2: // UPLOAD_ERR_FORM_SIZE
$errmessage = get_string('uploadformlimit');
break;
case 3: // UPLOAD_ERR_PARTIAL
$errmessage = get_string('uploadpartialfile');
break;
case 4: // UPLOAD_ERR_NO_FILE
$errmessage = get_string('uploadnofilefound');
break;
// Note: there is no error with a value of 5
case 6: // UPLOAD_ERR_NO_TMP_DIR
$errmessage = get_string('uploadnotempdir');
break;
case 7: // UPLOAD_ERR_CANT_WRITE
$errmessage = get_string('uploadcantwrite');
break;
case 8: // UPLOAD_ERR_EXTENSION
$errmessage = get_string('uploadextension');
break;
default:
$errmessage = get_string('uploadproblem');
}
return $errmessage;
}
/**
* Recursive function formating an array in POST parameter
* @param array $arraydata - the array that we are going to format and add into &$data array
* @param string $currentdata - a row of the final postdata array at instant T
* when finish, it's assign to $data under this format: name[keyname][][]...[]='value'
* @param array $data - the final data array containing all POST parameters : 1 row = 1 parameter
*/
function format_array_postdata_for_curlcall($arraydata, $currentdata, &$data) {
foreach ($arraydata as $k=>$v) {
$newcurrentdata = $currentdata;
if (is_array($v)) { //the value is an array, call the function recursively
$newcurrentdata = $newcurrentdata.'['.urlencode($k).']';
format_array_postdata_for_curlcall($v, $newcurrentdata, $data);
} else { //add the POST parameter to the $data array
$data[] = $newcurrentdata.'['.urlencode($k).']='.urlencode($v);
}
}
}
/**
* Transform a PHP array into POST parameter
* (see the recursive function format_array_postdata_for_curlcall)
* @param array $postdata
* @return array containing all POST parameters (1 row = 1 POST parameter)
*/
function format_postdata_for_curlcall($postdata) {
$data = array();
foreach ($postdata as $k=>$v) {
if (is_array($v)) {
$currentdata = urlencode($k);
format_array_postdata_for_curlcall($v, $currentdata, $data);
} else {
$data[] = urlencode($k).'='.urlencode($v ?? '');
}
}
$convertedpostdata = implode('&', $data);
return $convertedpostdata;
}
/**
* Fetches content of file from Internet (using proxy if defined). Uses cURL extension if present.
* Due to security concerns only downloads from http(s) sources are supported.
*
* @category files
* @param string $url file url starting with http(s)://
* @param array $headers http headers, null if none. If set, should be an
* associative array of header name => value pairs.
* @param array $postdata array means use POST request with given parameters
* @param bool $fullresponse return headers, responses, etc in a similar way snoopy does
* (if false, just returns content)
* @param int $timeout timeout for complete download process including all file transfer
* (default 5 minutes)
* @param int $connecttimeout timeout for connection to server; this is the timeout that
* usually happens if the remote server is completely down (default 20 seconds);
* may not work when using proxy
* @param bool $skipcertverify If true, the peer's SSL certificate will not be checked.
* Only use this when already in a trusted location.
* @param string $tofile store the downloaded content to file instead of returning it.
* @param bool $calctimeout false by default, true enables an extra head request to try and determine
* filesize and appropriately larger timeout based on $CFG->curltimeoutkbitrate
* @return stdClass|string|bool stdClass object if $fullresponse is true, false if request failed, true
* if file downloaded into $tofile successfully or the file content as a string.
*/
function download_file_content($url, $headers=null, $postdata=null, $fullresponse=false, $timeout=300, $connecttimeout=20, $skipcertverify=false, $tofile=NULL, $calctimeout=false) {
global $CFG;
// Only http and https links supported.
if (!preg_match('|^https?://|i', $url)) {
if ($fullresponse) {
$response = new stdClass();
$response->status = 0;
$response->headers = array();
$response->response_code = 'Invalid protocol specified in url';
$response->results = '';
$response->error = 'Invalid protocol specified in url';
return $response;
} else {
return false;
}
}
$options = array();
$headers2 = array();
if (is_array($headers)) {
foreach ($headers as $key => $value) {
if (is_numeric($key)) {
$headers2[] = $value;
} else {
$headers2[] = "$key: $value";
}
}
}
if ($skipcertverify) {
$options['CURLOPT_SSL_VERIFYPEER'] = false;
} else {
$options['CURLOPT_SSL_VERIFYPEER'] = true;
}
$options['CURLOPT_CONNECTTIMEOUT'] = $connecttimeout;
$options['CURLOPT_FOLLOWLOCATION'] = 1;
$options['CURLOPT_MAXREDIRS'] = 5;
// Use POST if requested.
if (is_array($postdata)) {
$postdata = format_postdata_for_curlcall($postdata);
} else if (empty($postdata)) {
$postdata = null;
}
// Optionally attempt to get more correct timeout by fetching the file size.
if (!isset($CFG->curltimeoutkbitrate)) {
// Use very slow rate of 56kbps as a timeout speed when not set.
$bitrate = 56;
} else {
$bitrate = $CFG->curltimeoutkbitrate;
}
if ($calctimeout and !isset($postdata)) {
$curl = new curl();
$curl->setHeader($headers2);
$curl->head($url, $postdata, $options);
$info = $curl->get_info();
$error_no = $curl->get_errno();
if (!$error_no && $info['download_content_length'] > 0) {
// No curl errors - adjust for large files only - take max timeout.
$timeout = max($timeout, ceil($info['download_content_length'] * 8 / ($bitrate * 1024)));
}
}
$curl = new curl();
$curl->setHeader($headers2);
$options['CURLOPT_RETURNTRANSFER'] = true;
$options['CURLOPT_NOBODY'] = false;
$options['CURLOPT_TIMEOUT'] = $timeout;
if ($tofile) {
$fh = fopen($tofile, 'w');
if (!$fh) {
if ($fullresponse) {
$response = new stdClass();
$response->status = 0;
$response->headers = array();
$response->response_code = 'Can not write to file';
$response->results = false;
$response->error = 'Can not write to file';
return $response;
} else {
return false;
}
}
$options['CURLOPT_FILE'] = $fh;
}
if (isset($postdata)) {
$content = $curl->post($url, $postdata, $options);
} else {
$content = $curl->get($url, null, $options);
}
if ($tofile) {
fclose($fh);
@chmod($tofile, $CFG->filepermissions);
}
/*
// Try to detect encoding problems.
if ((curl_errno($ch) == 23 or curl_errno($ch) == 61) and defined('CURLOPT_ENCODING')) {
curl_setopt($ch, CURLOPT_ENCODING, 'none');
$result = curl_exec($ch);
}
*/
$info = $curl->get_info();
$error_no = $curl->get_errno();
$rawheaders = $curl->get_raw_response();
if ($error_no) {
$error = $content;
if (!$fullresponse) {
debugging("cURL request for \"$url\" failed with: $error ($error_no)", DEBUG_ALL);
return false;
}
$response = new stdClass();
if ($error_no == 28) {
$response->status = '-100'; // Mimic snoopy.
} else {
$response->status = '0';
}
$response->headers = array();
$response->response_code = $error;
$response->results = false;
$response->error = $error;
return $response;
}
if ($tofile) {
$content = true;
}
if (empty($info['http_code'])) {
// For security reasons we support only true http connections (Location: file:// exploit prevention).
$response = new stdClass();
$response->status = '0';
$response->headers = array();
$response->response_code = 'Unknown cURL error';
$response->results = false; // do NOT change this, we really want to ignore the result!
$response->error = 'Unknown cURL error';
} else {
$response = new stdClass();
$response->status = (string)$info['http_code'];
$response->headers = $rawheaders;
$response->results = $content;
$response->error = '';
// There might be multiple headers on redirect, find the status of the last one.
$firstline = true;
foreach ($rawheaders as $line) {
if ($firstline) {
$response->response_code = $line;
$firstline = false;
}
if (trim($line, "\r\n") === '') {
$firstline = true;
}
}
}
if ($fullresponse) {
return $response;
}
if ($info['http_code'] != 200) {
debugging("cURL request for \"$url\" failed, HTTP response code: ".$response->response_code, DEBUG_ALL);
return false;
}
return $response->results;
}
/**
* Returns a list of information about file types based on extensions.
*
* The following elements expected in value array for each extension:
* 'type' - mimetype
* 'icon' - location of the icon file. If value is FILENAME, then either pix/f/FILENAME.gif
* or pix/f/FILENAME.png must be present in moodle and contain 16x16 filetype icon;
* also files with bigger sizes under names
* FILENAME-24, FILENAME-32, FILENAME-64, FILENAME-128, FILENAME-256 are recommended.
* 'groups' (optional) - array of filetype groups this filetype extension is part of;
* commonly used in moodle the following groups:
* - web_image - image that can be included as <img> in HTML
* - image - image that we can parse using GD to find it's dimensions, also used for portfolio format
* - optimised_image - image that will be processed and optimised
* - video - file that can be imported as video in text editor
* - audio - file that can be imported as audio in text editor
* - archive - we can extract files from this archive
* - spreadsheet - used for portfolio format
* - document - used for portfolio format
* - presentation - used for portfolio format
* 'string' (optional) - the name of the string from lang/en/mimetypes.php that displays
* human-readable description for this filetype;
* Function {@link get_mimetype_description()} first looks at the presence of string for
* particular mimetype (value of 'type'), if not found looks for string specified in 'string'
* attribute, if not found returns the value of 'type';
* 'defaulticon' (boolean, optional) - used by function {@link file_mimetype_icon()} to find
* an icon for mimetype. If an entry with 'defaulticon' is not found for a particular mimetype,
* this function will return first found icon; Especially usefull for types such as 'text/plain'
*
* @category files
* @return array List of information about file types based on extensions.
* Associative array of extension (lower-case) to associative array
* from 'element name' to data. Current element names are 'type' and 'icon'.
* Unknown types should use the 'xxx' entry which includes defaults.
*/
function &get_mimetypes_array() {
// Get types from the core_filetypes function, which includes caching.
return core_filetypes::get_types();
}
/**
* Determine a file's MIME type based on the given filename using the function mimeinfo.
*
* This function retrieves a file's MIME type for a file that will be sent to the user.
* This should only be used for file-sending purposes just like in send_stored_file, send_file, and send_temp_file.
* Should the file's MIME type cannot be determined by mimeinfo, it will return 'application/octet-stream' as a default
* MIME type which should tell the browser "I don't know what type of file this is, so just download it.".
*
* @param string $filename The file's filename.
* @return string The file's MIME type or 'application/octet-stream' if it cannot be determined.
*/
function get_mimetype_for_sending($filename = '') {
// Guess the file's MIME type using mimeinfo.
$mimetype = mimeinfo('type', $filename);
// Use octet-stream as fallback if MIME type cannot be determined by mimeinfo.
if (!$mimetype || $mimetype === 'document/unknown') {
$mimetype = 'application/octet-stream';
}
return $mimetype;
}
/**
* Obtains information about a filetype based on its extension. Will
* use a default if no information is present about that particular
* extension.
*
* @category files
* @param string $element Desired information (usually 'icon'
* for icon filename or 'type' for MIME type. Can also be
* 'icon24', ...32, 48, 64, 72, 80, 96, 128, 256)
* @param string $filename Filename we're looking up
* @return string Requested piece of information from array
*/
function mimeinfo($element, $filename) {
global $CFG;
$mimeinfo = & get_mimetypes_array();
static $iconpostfixes = array(256=>'-256', 128=>'-128', 96=>'-96', 80=>'-80', 72=>'-72', 64=>'-64', 48=>'-48', 32=>'-32', 24=>'-24', 16=>'');
$filetype = strtolower(pathinfo($filename ?? '', PATHINFO_EXTENSION));
if (empty($filetype)) {
$filetype = 'xxx'; // file without extension
}
if (preg_match('/^icon(\d*)$/', $element, $iconsizematch)) {
$iconsize = max(array(16, (int)$iconsizematch[1]));
$filenames = array($mimeinfo['xxx']['icon']);
if ($filetype != 'xxx' && isset($mimeinfo[$filetype]['icon'])) {
array_unshift($filenames, $mimeinfo[$filetype]['icon']);
}
// find the file with the closest size, first search for specific icon then for default icon
foreach ($filenames as $filename) {
foreach ($iconpostfixes as $size => $postfix) {
$fullname = $CFG->dirroot.'/pix/f/'.$filename.$postfix;
if ($iconsize >= $size &&
(file_exists($fullname.'.svg') || file_exists($fullname.'.png') || file_exists($fullname.'.gif'))) {
return $filename.$postfix;
}
}
}
} else if (isset($mimeinfo[$filetype][$element])) {
return $mimeinfo[$filetype][$element];
} else if (isset($mimeinfo['xxx'][$element])) {
return $mimeinfo['xxx'][$element]; // By default
} else {
return null;
}
}
/**
* Obtains information about a filetype based on the MIME type rather than
* the other way around.
*
* @category files
< * @param string $element Desired information ('extension', 'icon', 'icon-24', etc.)
> * @param string $element Desired information ('extension', 'icon', etc.)
* @param string $mimetype MIME type we're looking up
* @return string Requested piece of information from array
*/
function mimeinfo_from_type($element, $mimetype) {
/* array of cached mimetype->extension associations */
static $cached = array();
$mimeinfo = & get_mimetypes_array();
if (!array_key_exists($mimetype, $cached)) {
$cached[$mimetype] = null;
foreach($mimeinfo as $filetype => $values) {
if ($values['type'] == $mimetype) {
if ($cached[$mimetype] === null) {
$cached[$mimetype] = '.'.$filetype;
}
if (!empty($values['defaulticon'])) {
$cached[$mimetype] = '.'.$filetype;
break;
}
}
}
if (empty($cached[$mimetype])) {
$cached[$mimetype] = '.xxx';
}
}
if ($element === 'extension') {
return $cached[$mimetype];
} else {
return mimeinfo($element, $cached[$mimetype]);
}
}
/**
* Return the relative icon path for a given file
*
* Usage:
* <code>
* // $file - instance of stored_file or file_info
* $icon = $OUTPUT->image_url(file_file_icon($file))->out();
* echo html_writer::empty_tag('img', array('src' => $icon, 'alt' => get_mimetype_description($file)));
* </code>
* or
* <code>
* echo $OUTPUT->pix_icon(file_file_icon($file), get_mimetype_description($file));
* </code>
*
* @param stored_file|file_info|stdClass|array $file (in case of object attributes $file->filename
* and $file->mimetype are expected)
< * @param int $size The size of the icon. Defaults to 16 can also be 24, 32, 64, 128, 256
> * @param null $unused This parameter has been deprecated since 4.3 and should not be used anymore.
* @return string
*/
< function file_file_icon($file, $size = null) {
> function file_file_icon($file, $unused = null) {
> if ($unused !== null) {
> debugging('Deprecated argument passed to ' . __FUNCTION__, DEBUG_DEVELOPER);
> }
>
if (!is_object($file)) {
$file = (object)$file;
}
if (isset($file->filename)) {
$filename = $file->filename;
} else if (method_exists($file, 'get_filename')) {
$filename = $file->get_filename();
} else if (method_exists($file, 'get_visible_name')) {
$filename = $file->get_visible_name();
} else {
$filename = '';
}
if (isset($file->mimetype)) {
$mimetype = $file->mimetype;
} else if (method_exists($file, 'get_mimetype')) {
$mimetype = $file->get_mimetype();
} else {
$mimetype = '';
}
$mimetypes = &get_mimetypes_array();
if ($filename) {
$extension = strtolower(pathinfo($filename, PATHINFO_EXTENSION));
if ($extension && !empty($mimetypes[$extension])) {
// if file name has known extension, return icon for this extension
< return file_extension_icon($filename, $size);
> return file_extension_icon($filename);
}
}
< return file_mimetype_icon($mimetype, $size);
> return file_mimetype_icon($mimetype);
}
/**
< * Return the relative icon path for a folder image
> * Return the relative icon path for a folder image.
*
* Usage:
* <code>
* $icon = $OUTPUT->image_url(file_folder_icon())->out();
* echo html_writer::empty_tag('img', array('src' => $icon));
* </code>
* or
* <code>
< * echo $OUTPUT->pix_icon(file_folder_icon(32), '');
> * echo $OUTPUT->pix_icon(file_folder_icon(), '');
* </code>
*
< * @param int $iconsize The size of the icon. Defaults to 16 can also be 24, 32, 48, 64, 72, 80, 96, 128, 256
> * @param null $unused This parameter has been deprecated since 4.3 and should not be used anymore.
* @return string
*/
< function file_folder_icon($iconsize = null) {
> function file_folder_icon($unused = null) {
global $CFG;
< static $iconpostfixes = array(256=>'-256', 128=>'-128', 96=>'-96', 80=>'-80', 72=>'-72', 64=>'-64', 48=>'-48', 32=>'-32', 24=>'-24', 16=>'');
< static $cached = array();
< $iconsize = max(array(16, (int)$iconsize));
< if (!array_key_exists($iconsize, $cached)) {
< foreach ($iconpostfixes as $size => $postfix) {
< $fullname = $CFG->dirroot.'/pix/f/folder'.$postfix;
< if ($iconsize >= $size &&
< (file_exists($fullname.'.svg') || file_exists($fullname.'.png') || file_exists($fullname.'.gif'))) {
< $cached[$iconsize] = 'f/folder'.$postfix;
< break;
< }
< }
>
> if ($unused !== null) {
> debugging('Deprecated argument passed to ' . __FUNCTION__, DEBUG_DEVELOPER);
}
< return $cached[$iconsize];
>
> return 'f/folder';
}
/**
* Returns the relative icon path for a given mime type
*
* This function should be used in conjunction with $OUTPUT->image_url to produce
* a return the full path to an icon.
*
* <code>
* $mimetype = 'image/jpg';
* $icon = $OUTPUT->image_url(file_mimetype_icon($mimetype))->out();
* echo html_writer::empty_tag('img', array('src' => $icon, 'alt' => get_mimetype_description($mimetype)));
* </code>
*
* @category files
* @todo MDL-31074 When an $OUTPUT->icon method is available this function should be altered
* to conform with that.
* @param string $mimetype The mimetype to fetch an icon for
< * @param int $size The size of the icon. Defaults to 16 can also be 24, 32, 64, 128, 256
> * @param null $unused This parameter has been deprecated since 4.3 and should not be used anymore.
* @return string The relative path to the icon
*/
< function file_mimetype_icon($mimetype, $size = NULL) {
< return 'f/'.mimeinfo_from_type('icon'.$size, $mimetype);
> function file_mimetype_icon($mimetype, $unused = null) {
> return 'f/'.mimeinfo_from_type('icon', $mimetype);
}
/**
* Returns the relative icon path for a given file name
*
* This function should be used in conjunction with $OUTPUT->image_url to produce
* a return the full path to an icon.
*
* <code>
* $filename = '.jpg';
* $icon = $OUTPUT->image_url(file_extension_icon($filename))->out();
* echo html_writer::empty_tag('img', array('src' => $icon, 'alt' => '...'));
* </code>
*
* @todo MDL-31074 When an $OUTPUT->icon method is available this function should be altered
* to conform with that.
* @todo MDL-31074 Implement $size
* @category files
* @param string $filename The filename to get the icon for
< * @param int $size The size of the icon. Defaults to 16 can also be 24, 32, 64, 128, 256
> * @param null $unused This parameter has been deprecated since 4.3 and should not be used anymore.
* @return string
*/
< function file_extension_icon($filename, $size = NULL) {
< return 'f/'.mimeinfo('icon'.$size, $filename);
> function file_extension_icon($filename, $unused = null) {
> if ($unused !== null) {
> debugging('Deprecated argument passed to ' . __FUNCTION__, DEBUG_DEVELOPER);
> }
> return 'f/'.mimeinfo('icon', $filename);
}
/**
* Obtains descriptions for file types (e.g. 'Microsoft Word document') from the
* mimetypes.php language file.
*
* @param mixed $obj - instance of stored_file or file_info or array/stdClass with field
* 'filename' and 'mimetype', or just a string with mimetype (though it is recommended to
* have filename); In case of array/stdClass the field 'mimetype' is optional.
* @param bool $capitalise If true, capitalises first character of result
* @return string Text description
*/
function get_mimetype_description($obj, $capitalise=false) {
$filename = $mimetype = '';
if (is_object($obj) && method_exists($obj, 'get_filename') && method_exists($obj, 'get_mimetype')) {
// this is an instance of stored_file
$mimetype = $obj->get_mimetype();
$filename = $obj->get_filename();
} else if (is_object($obj) && method_exists($obj, 'get_visible_name') && method_exists($obj, 'get_mimetype')) {
// this is an instance of file_info
$mimetype = $obj->get_mimetype();
$filename = $obj->get_visible_name();
} else if (is_array($obj) || is_object ($obj)) {
$obj = (array)$obj;
if (!empty($obj['filename'])) {
$filename = $obj['filename'];
}
if (!empty($obj['mimetype'])) {
$mimetype = $obj['mimetype'];
}
} else {
$mimetype = $obj;
}
$mimetypefromext = mimeinfo('type', $filename);
if (empty($mimetype) || $mimetypefromext !== 'document/unknown') {
// if file has a known extension, overwrite the specified mimetype
$mimetype = $mimetypefromext;
}
$extension = strtolower(pathinfo($filename, PATHINFO_EXTENSION));
if (empty($extension)) {
$mimetypestr = mimeinfo_from_type('string', $mimetype);
$extension = str_replace('.', '', mimeinfo_from_type('extension', $mimetype));
} else {
$mimetypestr = mimeinfo('string', $filename);
}
$chunks = explode('/', $mimetype, 2);
$chunks[] = '';
$attr = array(
'mimetype' => $mimetype,
'ext' => $extension,
'mimetype1' => $chunks[0],
'mimetype2' => $chunks[1],
);
$a = array();
foreach ($attr as $key => $value) {
$a[$key] = $value;
$a[strtoupper($key)] = strtoupper($value);
$a[ucfirst($key)] = ucfirst($value);
}
// MIME types may include + symbol but this is not permitted in string ids.
$safemimetype = str_replace('+', '_', $mimetype ?? '');
$safemimetypestr = str_replace('+', '_', $mimetypestr ?? '');
$customdescription = mimeinfo('customdescription', $filename);
if ($customdescription) {
// Call format_string on the custom description so that multilang
// filter can be used (if enabled on system context). We use system
// context because it is possible that the page context might not have
// been defined yet.
$result = format_string($customdescription, true,
array('context' => context_system::instance()));
} else if (get_string_manager()->string_exists($safemimetype, 'mimetypes')) {
$result = get_string($safemimetype, 'mimetypes', (object)$a);
} else if (get_string_manager()->string_exists($safemimetypestr, 'mimetypes')) {
$result = get_string($safemimetypestr, 'mimetypes', (object)$a);
} else if (get_string_manager()->string_exists('default', 'mimetypes')) {
$result = get_string('default', 'mimetypes', (object)$a);
} else {
$result = $mimetype;
}
if ($capitalise) {
$result=ucfirst($result);
}
return $result;
}
/**
* Returns array of elements of type $element in type group(s)
*
* @param string $element name of the element we are interested in, usually 'type' or 'extension'
* @param string|array $groups one group or array of groups/extensions/mimetypes
* @return array
*/
function file_get_typegroup($element, $groups) {
static $cached = array();
// Turn groups into a list.
if (!is_array($groups)) {
$groups = preg_split('/[\s,;:"\']+/', $groups, -1, PREG_SPLIT_NO_EMPTY);
}
if (!array_key_exists($element, $cached)) {
$cached[$element] = array();
}
$result = array();
foreach ($groups as $group) {
if (!array_key_exists($group, $cached[$element])) {
// retrieive and cache all elements of type $element for group $group
$mimeinfo = & get_mimetypes_array();
$cached[$element][$group] = array();
foreach ($mimeinfo as $extension => $value) {
$value['extension'] = '.'.$extension;
if (empty($value[$element])) {
continue;
}
if (($group === '.'.$extension || $group === $value['type'] ||
(!empty($value['groups']) && in_array($group, $value['groups']))) &&
!in_array($value[$element], $cached[$element][$group])) {
$cached[$element][$group][] = $value[$element];
}
}
}
$result = array_merge($result, $cached[$element][$group]);
}
return array_values(array_unique($result));
}
/**
* Checks if file with name $filename has one of the extensions in groups $groups
*
* @see get_mimetypes_array()
* @param string $filename name of the file to check
* @param string|array $groups one group or array of groups to check
* @param bool $checktype if true and extension check fails, find the mimetype and check if
* file mimetype is in mimetypes in groups $groups
* @return bool
*/
function file_extension_in_typegroup($filename, $groups, $checktype = false) {
$extension = pathinfo($filename, PATHINFO_EXTENSION);
if (!empty($extension) && in_array('.'.strtolower($extension), file_get_typegroup('extension', $groups))) {
return true;
}
return $checktype && file_mimetype_in_typegroup(mimeinfo('type', $filename), $groups);
}
/**
* Checks if mimetype $mimetype belongs to one of the groups $groups
*
* @see get_mimetypes_array()
* @param string $mimetype
* @param string|array $groups one group or array of groups to check
* @return bool
*/
function file_mimetype_in_typegroup($mimetype, $groups) {
return !empty($mimetype) && in_array($mimetype, file_get_typegroup('type', $groups));
}
/**
* Requested file is not found or not accessible, does not return, terminates script
*
* @global stdClass $CFG
* @global stdClass $COURSE
*/
function send_file_not_found() {
global $CFG, $COURSE;
// Allow cross-origin requests only for Web Services.
// This allow to receive requests done by Web Workers or webapps in different domains.
if (WS_SERVER) {
header('Access-Control-Allow-Origin: *');
}
send_header_404();
throw new \moodle_exception('filenotfound', 'error',
$CFG->wwwroot.'/course/view.php?id='.$COURSE->id); // This is not displayed on IIS?
}
/**
* Helper function to send correct 404 for server.
*/
function send_header_404() {
if (substr(php_sapi_name(), 0, 3) == 'cgi') {
header("Status: 404 Not Found");
} else {
header('HTTP/1.0 404 not found');
}
}
/**
* The readfile function can fail when files are larger than 2GB (even on 64-bit
* platforms). This wrapper uses readfile for small files and custom code for
* large ones.
*
* @param string $path Path to file
* @param int $filesize Size of file (if left out, will get it automatically)
* @return int|bool Size read (will always be $filesize) or false if failed
*/
function readfile_allow_large($path, $filesize = -1) {
// Automatically get size if not specified.
if ($filesize === -1) {
$filesize = filesize($path);
}
if ($filesize <= 2147483647) {
// If the file is up to 2^31 - 1, send it normally using readfile.
return readfile($path);
} else {
// For large files, read and output in 64KB chunks.
$handle = fopen($path, 'r');
if ($handle === false) {
return false;
}
$left = $filesize;
while ($left > 0) {
$size = min($left, 65536);
$buffer = fread($handle, $size);
if ($buffer === false) {
return false;
}
echo $buffer;
$left -= $size;
}
return $filesize;
}
}
/**
* Enhanced readfile() with optional acceleration.
* @param string|stored_file $file
* @param string $mimetype
* @param bool $accelerate
* @return void
*/
function readfile_accel($file, $mimetype, $accelerate) {
global $CFG;
if ($mimetype === 'text/plain') {
// there is no encoding specified in text files, we need something consistent
header('Content-Type: text/plain; charset=utf-8');
} else {
header('Content-Type: '.$mimetype);
}
$lastmodified = is_object($file) ? $file->get_timemodified() : filemtime($file);
header('Last-Modified: '. gmdate('D, d M Y H:i:s', $lastmodified) .' GMT');
if (is_object($file)) {
header('Etag: "' . $file->get_contenthash() . '"');
if (isset($_SERVER['HTTP_IF_NONE_MATCH']) and trim($_SERVER['HTTP_IF_NONE_MATCH'], '"') === $file->get_contenthash()) {
header('HTTP/1.1 304 Not Modified');
return;
}
}
// if etag present for stored file rely on it exclusively
if (!empty($_SERVER['HTTP_IF_MODIFIED_SINCE']) and (empty($_SERVER['HTTP_IF_NONE_MATCH']) or !is_object($file))) {
// get unixtime of request header; clip extra junk off first
$since = strtotime(preg_replace('/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"]));
if ($since && $since >= $lastmodified) {
header('HTTP/1.1 304 Not Modified');
return;
}
}
if ($accelerate and empty($CFG->disablebyteserving) and $mimetype !== 'text/plain') {
header('Accept-Ranges: bytes');
} else {
header('Accept-Ranges: none');
}
if ($accelerate) {
if (is_object($file)) {
$fs = get_file_storage();
if ($fs->supports_xsendfile()) {
if ($fs->xsendfile_file($file)) {
return;
}
}
} else {
if (!empty($CFG->xsendfile)) {
require_once("$CFG->libdir/xsendfilelib.php");
if (xsendfile($file)) {
return;
}
}
}
}
$filesize = is_object($file) ? $file->get_filesize() : filesize($file);
header('Last-Modified: '. gmdate('D, d M Y H:i:s', $lastmodified) .' GMT');
if ($accelerate and empty($CFG->disablebyteserving) and $mimetype !== 'text/plain') {
if (!empty($_SERVER['HTTP_RANGE']) and strpos($_SERVER['HTTP_RANGE'],'bytes=') !== FALSE) {
// byteserving stuff - for acrobat reader and download accelerators
// see: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35
// inspired by: http://www.coneural.org/florian/papers/04_byteserving.php
$ranges = false;
if (preg_match_all('/(\d*)-(\d*)/', $_SERVER['HTTP_RANGE'], $ranges, PREG_SET_ORDER)) {
foreach ($ranges as $key=>$value) {
if ($ranges[$key][1] == '') {
//suffix case
$ranges[$key][1] = $filesize - $ranges[$key][2];
$ranges[$key][2] = $filesize - 1;
} else if ($ranges[$key][2] == '' || $ranges[$key][2] > $filesize - 1) {
//fix range length
$ranges[$key][2] = $filesize - 1;
}
if ($ranges[$key][2] != '' && $ranges[$key][2] < $ranges[$key][1]) {
//invalid byte-range ==> ignore header
$ranges = false;
break;
}
//prepare multipart header
$ranges[$key][0] = "\r\n--".BYTESERVING_BOUNDARY."\r\nContent-Type: $mimetype\r\n";
$ranges[$key][0] .= "Content-Range: bytes {$ranges[$key][1]}-{$ranges[$key][2]}/$filesize\r\n\r\n";
}
} else {
$ranges = false;
}
if ($ranges) {
if (is_object($file)) {
$handle = $file->get_content_file_handle();
if ($handle === false) {
throw new file_exception('storedfilecannotreadfile', $file->get_filename());
}
} else {
$handle = fopen($file, 'rb');
if ($handle === false) {
throw new file_exception('cannotopenfile', $file);
}
}
byteserving_send_file($handle, $mimetype, $ranges, $filesize);
}
}
}
header('Content-Length: ' . $filesize);
if (!empty($_SERVER['REQUEST_METHOD']) and $_SERVER['REQUEST_METHOD'] === 'HEAD') {
exit;
}
while (ob_get_level()) {
$handlerstack = ob_list_handlers();
$activehandler = array_pop($handlerstack);
if ($activehandler === 'default output handler') {
// We do not expect any content in the buffer when we are serving files.
$buffercontents = ob_get_clean();
if ($buffercontents !== '') {
error_log('Non-empty default output handler buffer detected while serving the file ' . $file);
}
} else {
// Some handlers such as zlib output compression may have file signature buffered - flush it.
ob_end_flush();
}
}
// send the whole file content
if (is_object($file)) {
$file->readfile();
} else {
if (readfile_allow_large($file, $filesize) === false) {
throw new file_exception('cannotopenfile', $file);
}
}
}
/**
* Similar to readfile_accel() but designed for strings.
* @param string $string
* @param string $mimetype
* @param bool $accelerate Ignored
* @return void
*/
function readstring_accel($string, $mimetype, $accelerate = false) {
global $CFG;
if ($mimetype === 'text/plain') {
// there is no encoding specified in text files, we need something consistent
header('Content-Type: text/plain; charset=utf-8');
} else {
header('Content-Type: '.$mimetype);
}
header('Last-Modified: '. gmdate('D, d M Y H:i:s', time()) .' GMT');
header('Accept-Ranges: none');
header('Content-Length: '.strlen($string));
echo $string;
}
/**
* Handles the sending of temporary file to user, download is forced.
* File is deleted after abort or successful sending, does not return, script terminated
*
* @param string $path path to file, preferably from moodledata/temp/something; or content of file itself
* @param string $filename proposed file name when saving file
* @param bool $pathisstring If the path is string
*/
function send_temp_file($path, $filename, $pathisstring=false) {
global $CFG;
// Guess the file's MIME type.
$mimetype = get_mimetype_for_sending($filename);
// close session - not needed anymore
\core\session\manager::write_close();
if (!$pathisstring) {
if (!file_exists($path)) {
send_header_404();
throw new \moodle_exception('filenotfound', 'error', $CFG->wwwroot.'/');
}
// executed after normal finish or abort
core_shutdown_manager::register_function('send_temp_file_finished', array($path));
}
// if user is using IE, urlencode the filename so that multibyte file name will show up correctly on popup
if (core_useragent::is_ie() || core_useragent::is_edge()) {
$filename = urlencode($filename);
}
// If this file was requested from a form, then mark download as complete.
\core_form\util::form_download_complete();
header('Content-Disposition: attachment; filename="'.$filename.'"');
if (is_https()) { // HTTPS sites - watch out for IE! KB812935 and KB316431.
header('Cache-Control: private, max-age=10, no-transform');
header('Expires: '. gmdate('D, d M Y H:i:s', 0) .' GMT');
header('Pragma: ');
} else { //normal http - prevent caching at all cost
header('Cache-Control: private, must-revalidate, pre-check=0, post-check=0, max-age=0, no-transform');
header('Expires: '. gmdate('D, d M Y H:i:s', 0) .' GMT');
header('Pragma: no-cache');
}
// send the contents - we can not accelerate this because the file will be deleted asap
if ($pathisstring) {
readstring_accel($path, $mimetype);
} else {
readfile_accel($path, $mimetype, false);
@unlink($path);
}
die; //no more chars to output
}
/**
* Internal callback function used by send_temp_file()
*
* @param string $path
*/
function send_temp_file_finished($path) {
if (file_exists($path)) {
@unlink($path);
}
}
/**
* Serve content which is not meant to be cached.
*
* This is only intended to be used for volatile public files, for instance
* when development is enabled, or when caching is not required on a public resource.
*
* @param string $content Raw content.
* @param string $filename The file name.
* @return void
*/
function send_content_uncached($content, $filename) {
$mimetype = mimeinfo('type', $filename);
$charset = strpos($mimetype, 'text/') === 0 ? '; charset=utf-8' : '';
header('Content-Disposition: inline; filename="' . $filename . '"');
header('Last-Modified: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT');
header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 2) . ' GMT');
header('Pragma: ');
header('Accept-Ranges: none');
header('Content-Type: ' . $mimetype . $charset);
header('Content-Length: ' . strlen($content));
echo $content;
die();
}
/**
* Safely save content to a certain path.
*
* This function tries hard to be atomic by first copying the content
* to a separate file, and then moving the file across. It also prevents
* the user to abort a request to prevent half-safed files.
*
* This function is intended to be used when saving some content to cache like
* $CFG->localcachedir. If you're not caching a file you should use the File API.
*
* @param string $content The file content.
* @param string $destination The absolute path of the final file.
* @return void
*/
function file_safe_save_content($content, $destination) {
global $CFG;
clearstatcache();
if (!file_exists(dirname($destination))) {
@mkdir(dirname($destination), $CFG->directorypermissions, true);
}
// Prevent serving of incomplete file from concurrent request,
// the rename() should be more atomic than fwrite().
ignore_user_abort(true);
if ($fp = fopen($destination . '.tmp', 'xb')) {
fwrite($fp, $content);
fclose($fp);
rename($destination . '.tmp', $destination);
@chmod($destination, $CFG->filepermissions);
@unlink($destination . '.tmp'); // Just in case anything fails.
}
ignore_user_abort(false);
if (connection_aborted()) {
die();
}
}
/**
* Handles the sending of file data to the user's browser, including support for
* byteranges etc.
*
* @category files
* @param string|stored_file $path Path of file on disk (including real filename),
* or actual content of file as string,
* or stored_file object
* @param string $filename Filename to send
* @param int $lifetime Number of seconds before the file should expire from caches (null means $CFG->filelifetime)
* @param int $filter 0 (default)=no filtering, 1=all files, 2=html files only
* @param bool $pathisstring If true (default false), $path is the content to send and not the pathname.
* Forced to false when $path is a stored_file object.
* @param bool $forcedownload If true (default false), forces download of file rather than view in browser/plugin
* @param string $mimetype Include to specify the MIME type; leave blank to have it guess the type from $filename
* @param bool $dontdie - return control to caller afterwards. this is not recommended and only used for cleanup tasks.
* if this is passed as true, ignore_user_abort is called. if you don't want your processing to continue on cancel,
* you must detect this case when control is returned using connection_aborted. Please not that session is closed
* and should not be reopened.
* @param array $options An array of options, currently accepts:
* - (string) cacheability: public, or private.
* - (string|null) immutable
* - (bool) dontforcesvgdownload: true if force download should be disabled on SVGs.
* Note: This overrides a security feature, so should only be applied to "trusted" content
* (eg module content that is created using an XSS risk flagged capability, such as SCORM).
* @return null script execution stopped unless $dontdie is true
*/
function send_file($path, $filename, $lifetime = null , $filter=0, $pathisstring=false, $forcedownload=false, $mimetype='',
$dontdie=false, array $options = array()) {
global $CFG, $COURSE;
if ($dontdie) {
ignore_user_abort(true);
}
if ($lifetime === 'default' or is_null($lifetime)) {
$lifetime = $CFG->filelifetime;
}
if (is_object($path)) {
$pathisstring = false;
}
\core\session\manager::write_close(); // Unlock session during file serving.
// Use given MIME type if specified, otherwise guess it.
if (!$mimetype || $mimetype === 'document/unknown') {
$mimetype = get_mimetype_for_sending($filename);
}
// if user is using IE, urlencode the filename so that multibyte file name will show up correctly on popup
if (core_useragent::is_ie() || core_useragent::is_edge()) {
$filename = rawurlencode($filename);
}
// Make sure we force download of SVG files, unless the module explicitly allows them (eg within SCORM content).
// This is for security reasons (https://digi.ninja/blog/svg_xss.php).
if (file_is_svg_image_from_mimetype($mimetype) && empty($options['dontforcesvgdownload'])) {
$forcedownload = true;
}
if ($forcedownload) {
header('Content-Disposition: attachment; filename="'.$filename.'"');
// If this file was requested from a form, then mark download as complete.
\core_form\util::form_download_complete();
} else if ($mimetype !== 'application/x-shockwave-flash') {
// If this is an swf don't pass content-disposition with filename as this makes the flash player treat the file
// as an upload and enforces security that may prevent the file from being loaded.
header('Content-Disposition: inline; filename="'.$filename.'"');
}
if ($lifetime > 0) {
$immutable = '';
if (!empty($options['immutable'])) {
$immutable = ', immutable';
// Overwrite lifetime accordingly:
// 90 days only - based on Moodle point release cadence being every 3 months.
$lifetimemin = 60 * 60 * 24 * 90;
$lifetime = max($lifetime, $lifetimemin);
}
$cacheability = ' public,';
if (!empty($options['cacheability']) && ($options['cacheability'] === 'public')) {
// This file must be cache-able by both browsers and proxies.
$cacheability = ' public,';
} else if (!empty($options['cacheability']) && ($options['cacheability'] === 'private')) {
// This file must be cache-able only by browsers.
$cacheability = ' private,';
} else if (isloggedin() and !isguestuser()) {
// By default, under the conditions above, this file must be cache-able only by browsers.
$cacheability = ' private,';
}
$nobyteserving = false;
header('Cache-Control:'.$cacheability.' max-age='.$lifetime.', no-transform'.$immutable);
header('Expires: '. gmdate('D, d M Y H:i:s', time() + $lifetime) .' GMT');
header('Pragma: ');
} else { // Do not cache files in proxies and browsers
$nobyteserving = true;
if (is_https()) { // HTTPS sites - watch out for IE! KB812935 and KB316431.
header('Cache-Control: private, max-age=10, no-transform');
header('Expires: '. gmdate('D, d M Y H:i:s', 0) .' GMT');
header('Pragma: ');
} else { //normal http - prevent caching at all cost
header('Cache-Control: private, must-revalidate, pre-check=0, post-check=0, max-age=0, no-transform');
header('Expires: '. gmdate('D, d M Y H:i:s', 0) .' GMT');
header('Pragma: no-cache');
}
}
if (empty($filter)) {
// send the contents
if ($pathisstring) {
readstring_accel($path, $mimetype);
} else {
readfile_accel($path, $mimetype, !$dontdie);
}
} else {
// Try to put the file through filters
if ($mimetype == 'text/html' || $mimetype == 'application/xhtml+xml' || file_is_svg_image_from_mimetype($mimetype)) {
$options = new stdClass();
$options->noclean = true;
$options->nocache = true; // temporary workaround for MDL-5136
if (is_object($path)) {
$text = $path->get_content();
} else if ($pathisstring) {
$text = $path;
} else {
$text = implode('', file($path));
}
$output = format_text($text, FORMAT_HTML, $options, $COURSE->id);
readstring_accel($output, $mimetype);
} else if (($mimetype == 'text/plain') and ($filter == 1)) {
// only filter text if filter all files is selected
$options = new stdClass();
$options->newlines = false;
$options->noclean = true;
if (is_object($path)) {
$text = htmlentities($path->get_content(), ENT_QUOTES, 'UTF-8');
} else if ($pathisstring) {
$text = htmlentities($path, ENT_QUOTES, 'UTF-8');
} else {
$text = htmlentities(implode('', file($path)), ENT_QUOTES, 'UTF-8');
}
$output = '<pre>'. format_text($text, FORMAT_MOODLE, $options, $COURSE->id) .'</pre>';
readstring_accel($output, $mimetype);
} else {
// send the contents
if ($pathisstring) {
readstring_accel($path, $mimetype);
} else {
readfile_accel($path, $mimetype, !$dontdie);
}
}
}
if ($dontdie) {
return;
}
die; //no more chars to output!!!
}
/**
* Handles the sending of file data to the user's browser, including support for
* byteranges etc.
*
* The $options parameter supports the following keys:
* (string|null) preview - send the preview of the file (e.g. "thumb" for a thumbnail)
* (string|null) filename - overrides the implicit filename
* (bool) dontdie - return control to caller afterwards. this is not recommended and only used for cleanup tasks.
* if this is passed as true, ignore_user_abort is called. if you don't want your processing to continue on cancel,
* you must detect this case when control is returned using connection_aborted. Please not that session is closed
* and should not be reopened
* (string|null) cacheability - force the cacheability setting of the HTTP response, "private" or "public",
* when $lifetime is greater than 0. Cacheability defaults to "private" when logged in as other than guest; otherwise,
* defaults to "public".
* (string|null) immutable - set the immutable cache setting in the HTTP response, when served under HTTPS.
* Note: it's up to the consumer to set it properly i.e. when serving a "versioned" URL.
*
* @category files
< * @param stored_file $stored_file local file object
> * @param stored_file $storedfile local file object
* @param int $lifetime Number of seconds before the file should expire from caches (null means $CFG->filelifetime)
* @param int $filter 0 (default)=no filtering, 1=all files, 2=html files only
* @param bool $forcedownload If true (default false), forces download of file rather than view in browser/plugin
* @param array $options additional options affecting the file serving
* @return null script execution stopped unless $options['dontdie'] is true
*/
< function send_stored_file($stored_file, $lifetime=null, $filter=0, $forcedownload=false, array $options=array()) {
> function send_stored_file($storedfile, $lifetime=null, $filter=0, $forcedownload=false, array $options=array()) {
global $CFG, $COURSE;
static $recursion = 0;
if (empty($options['filename'])) {
$filename = null;
} else {
$filename = $options['filename'];
}
if (empty($options['dontdie'])) {
$dontdie = false;
} else {
$dontdie = true;
}
if ($lifetime === 'default' or is_null($lifetime)) {
$lifetime = $CFG->filelifetime;
}
if (!empty($options['preview'])) {
// replace the file with its preview
$fs = get_file_storage();
< $preview_file = $fs->get_file_preview($stored_file, $options['preview']);
< if (!$preview_file) {
< // unable to create a preview of the file, send its default mime icon instead
< if ($options['preview'] === 'tinyicon') {
< $size = 24;
< } else if ($options['preview'] === 'thumb') {
< $size = 90;
< } else {
< $size = 256;
< }
< $fileicon = file_file_icon($stored_file, $size);
< send_file($CFG->dirroot.'/pix/'.$fileicon.'.png', basename($fileicon).'.png');
> $previewfile = $fs->get_file_preview($storedfile, $options['preview']);
> if (!$previewfile) {
> // Unable to create a preview of the file, send its default mime icon instead.
> $fileicon = file_file_icon($storedfile);
> send_file($CFG->dirroot.'/pix/'.$fileicon.'.svg', basename($fileicon).'.svg');
} else {
// preview images have fixed cache lifetime and they ignore forced download
// (they are generated by GD and therefore they are considered reasonably safe).
< $stored_file = $preview_file;
> $storedfile = $previewfile;
$lifetime = DAYSECS;
$filter = 0;
$forcedownload = false;
}
}
// handle external resource
< if ($stored_file && $stored_file->is_external_file() && !isset($options['sendcachedexternalfile'])) {
> if ($storedfile && $storedfile->is_external_file() && !isset($options['sendcachedexternalfile'])) {
// Have we been here before?
$recursion++;
if ($recursion > 10) {
throw new coding_exception('Recursive file serving detected');
}
< $stored_file->send_file($lifetime, $filter, $forcedownload, $options);
> $storedfile->send_file($lifetime, $filter, $forcedownload, $options);
die;
}
< if (!$stored_file or $stored_file->is_directory()) {
< // nothing to serve
> if (!$storedfile || $storedfile->is_directory()) {
> // Nothing to serve.
if ($dontdie) {
return;
}
die;
}
< $filename = is_null($filename) ? $stored_file->get_filename() : $filename;
> $filename = is_null($filename) ? $storedfile->get_filename() : $filename;
// Use given MIME type if specified.
< $mimetype = $stored_file->get_mimetype();
> $mimetype = $storedfile->get_mimetype();
// Allow cross-origin requests only for Web Services.
// This allow to receive requests done by Web Workers or webapps in different domains.
if (WS_SERVER) {
header('Access-Control-Allow-Origin: *');
}
< send_file($stored_file, $filename, $lifetime, $filter, false, $forcedownload, $mimetype, $dontdie, $options);
> send_file($storedfile, $filename, $lifetime, $filter, false, $forcedownload, $mimetype, $dontdie, $options);
}
/**
* Recursively delete the file or folder with path $location. That is,
* if it is a file delete it. If it is a folder, delete all its content
* then delete it. If $location does not exist to start, that is not
* considered an error.
*
* @param string $location the path to remove.
* @return bool
*/
function fulldelete($location) {
if (empty($location)) {
// extra safety against wrong param
return false;
}
if (is_dir($location)) {
if (!$currdir = opendir($location)) {
return false;
}
while (false !== ($file = readdir($currdir))) {
if ($file <> ".." && $file <> ".") {
$fullfile = $location."/".$file;
if (is_dir($fullfile)) {
if (!fulldelete($fullfile)) {
return false;
}
} else {
if (!unlink($fullfile)) {
return false;
}
}
}
}
closedir($currdir);
if (! rmdir($location)) {
return false;
}
} else if (file_exists($location)) {
if (!unlink($location)) {
return false;
}
}
return true;
}
/**
* Send requested byterange of file.
*
* @param resource $handle A file handle
* @param string $mimetype The mimetype for the output
* @param array $ranges An array of ranges to send
* @param string $filesize The size of the content if only one range is used
*/
function byteserving_send_file($handle, $mimetype, $ranges, $filesize) {
// better turn off any kind of compression and buffering
ini_set('zlib.output_compression', 'Off');
$chunksize = 1*(1024*1024); // 1MB chunks - must be less than 2MB!
if ($handle === false) {
die;
}
if (count($ranges) == 1) { //only one range requested
$length = $ranges[0][2] - $ranges[0][1] + 1;
header('HTTP/1.1 206 Partial content');
header('Content-Length: '.$length);
header('Content-Range: bytes '.$ranges[0][1].'-'.$ranges[0][2].'/'.$filesize);
header('Content-Type: '.$mimetype);
while(@ob_get_level()) {
if (!@ob_end_flush()) {
break;
}
}
fseek($handle, $ranges[0][1]);
while (!feof($handle) && $length > 0) {
core_php_time_limit::raise(60*60); //reset time limit to 60 min - should be enough for 1 MB chunk
$buffer = fread($handle, ($chunksize < $length ? $chunksize : $length));
echo $buffer;
flush();
$length -= strlen($buffer);
}
fclose($handle);
die;
} else { // multiple ranges requested - not tested much
$totallength = 0;
foreach($ranges as $range) {
$totallength += strlen($range[0]) + $range[2] - $range[1] + 1;
}
$totallength += strlen("\r\n--".BYTESERVING_BOUNDARY."--\r\n");
header('HTTP/1.1 206 Partial content');
header('Content-Length: '.$totallength);
header('Content-Type: multipart/byteranges; boundary='.BYTESERVING_BOUNDARY);
while(@ob_get_level()) {
if (!@ob_end_flush()) {
break;
}
}
foreach($ranges as $range) {
$length = $range[2] - $range[1] + 1;
echo $range[0];
fseek($handle, $range[1]);
while (!feof($handle) && $length > 0) {
core_php_time_limit::raise(60*60); //reset time limit to 60 min - should be enough for 1 MB chunk
$buffer = fread($handle, ($chunksize < $length ? $chunksize : $length));
echo $buffer;
flush();
$length -= strlen($buffer);
}
}
echo "\r\n--".BYTESERVING_BOUNDARY."--\r\n";
fclose($handle);
die;
}
}
/**
* Tells whether the filename is executable.
*
* @link http://php.net/manual/en/function.is-executable.php
* @link https://bugs.php.net/bug.php?id=41062
* @param string $filename Path to the file.
* @return bool True if the filename exists and is executable; otherwise, false.
*/
function file_is_executable($filename) {
if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
if (is_executable($filename)) {
return true;
} else {
$fileext = strrchr($filename, '.');
// If we have an extension we can check if it is listed as executable.
if ($fileext && file_exists($filename) && !is_dir($filename)) {
$winpathext = strtolower(getenv('PATHEXT'));
$winpathexts = explode(';', $winpathext);
return in_array(strtolower($fileext), $winpathexts);
}
return false;
}
} else {
return is_executable($filename);
}
}
/**
* Overwrite an existing file in a draft area.
*
* @param stored_file $newfile the new file with the new content and meta-data
* @param stored_file $existingfile the file that will be overwritten
* @throws moodle_exception
* @since Moodle 3.2
*/
function file_overwrite_existing_draftfile(stored_file $newfile, stored_file $existingfile) {
if ($existingfile->get_component() != 'user' or $existingfile->get_filearea() != 'draft') {
throw new coding_exception('The file to overwrite is not in a draft area.');
}
$fs = get_file_storage();
// Remember original file source field.
$source = @unserialize($existingfile->get_source() ?? '');
// Remember the original sortorder.
$sortorder = $existingfile->get_sortorder();
if ($newfile->is_external_file()) {
// New file is a reference. Check that existing file does not have any other files referencing to it
if (isset($source->original) && $fs->search_references_count($source->original)) {
throw new moodle_exception('errordoublereference', 'repository');
}
}
// Delete existing file to release filename.
$newfilerecord = array(
'contextid' => $existingfile->get_contextid(),
'component' => 'user',
'filearea' => 'draft',
'itemid' => $existingfile->get_itemid(),
'timemodified' => time()
);
$existingfile->delete();
// Create new file.
$newfile = $fs->create_file_from_storedfile($newfilerecord, $newfile);
// Preserve original file location (stored in source field) for handling references.
if (isset($source->original)) {
if (!($newfilesource = @unserialize($newfile->get_source() ?? ''))) {
$newfilesource = new stdClass();
}
$newfilesource->original = $source->original;
$newfile->set_source(serialize($newfilesource));
}
$newfile->set_sortorder($sortorder);
}
/**
* Add files from a draft area into a final area.
*
* Most of the time you do not want to use this. It is intended to be used
* by asynchronous services which cannot direcly manipulate a final
* area through a draft area. Instead they add files to a new draft
* area and merge that new draft into the final area when ready.
*
* @param int $draftitemid the id of the draft area to use.
* @param int $contextid this parameter and the next two identify the file area to save to.
* @param string $component component name
* @param string $filearea indentifies the file area
* @param int $itemid identifies the item id or false for all items in the file area
* @param array $options area options (subdirs=false, maxfiles=-1, maxbytes=0, areamaxbytes=FILE_AREA_MAX_BYTES_UNLIMITED)
* @see file_save_draft_area_files
* @since Moodle 3.2
*/
function file_merge_files_from_draft_area_into_filearea($draftitemid, $contextid, $component, $filearea, $itemid,
array $options = null) {
// We use 0 here so file_prepare_draft_area creates a new one, finaldraftid will be updated with the new draft id.
$finaldraftid = 0;
file_prepare_draft_area($finaldraftid, $contextid, $component, $filearea, $itemid, $options);
file_merge_draft_area_into_draft_area($draftitemid, $finaldraftid);
file_save_draft_area_files($finaldraftid, $contextid, $component, $filearea, $itemid, $options);
}
/**
* Merge files from two draftarea areas.
*
* This does not handle conflict resolution, files in the destination area which appear
* to be more recent will be kept disregarding the intended ones.
*
* @param int $getfromdraftid the id of the draft area where are the files to merge.
* @param int $mergeintodraftid the id of the draft area where new files will be merged.
* @throws coding_exception
* @since Moodle 3.2
*/
function file_merge_draft_area_into_draft_area($getfromdraftid, $mergeintodraftid) {
global $USER;
$fs = get_file_storage();
$contextid = context_user::instance($USER->id)->id;
if (!$filestomerge = $fs->get_area_files($contextid, 'user', 'draft', $getfromdraftid)) {
throw new coding_exception('Nothing to merge or area does not belong to current user');
}
$currentfiles = $fs->get_area_files($contextid, 'user', 'draft', $mergeintodraftid);
// Get hashes of the files to merge.
$newhashes = array();
foreach ($filestomerge as $filetomerge) {
$filepath = $filetomerge->get_filepath();
$filename = $filetomerge->get_filename();
$newhash = $fs->get_pathname_hash($contextid, 'user', 'draft', $mergeintodraftid, $filepath, $filename);
$newhashes[$newhash] = $filetomerge;
}
// Calculate wich files must be added.
foreach ($currentfiles as $file) {
$filehash = $file->get_pathnamehash();
// One file to be merged already exists.
if (isset($newhashes[$filehash])) {
$updatedfile = $newhashes[$filehash];
// Avoid race conditions.
if ($file->get_timemodified() > $updatedfile->get_timemodified()) {
// The existing file is more recent, do not copy the suposedly "new" one.
unset($newhashes[$filehash]);
continue;
}
// Update existing file (not only content, meta-data too).
file_overwrite_existing_draftfile($updatedfile, $file);
unset($newhashes[$filehash]);
}
}
foreach ($newhashes as $newfile) {
$newfilerecord = array(
'contextid' => $contextid,
'component' => 'user',
'filearea' => 'draft',
'itemid' => $mergeintodraftid,
'timemodified' => time()
);
$fs->create_file_from_storedfile($newfilerecord, $newfile);
}
}
/**
* Attempt to determine whether the specified mime-type is an SVG image or not.
*
* @param string $mimetype Mime-type
* @return bool True if it is an SVG file
*/
function file_is_svg_image_from_mimetype(string $mimetype): bool {
return preg_match('|^image/svg|', $mimetype);
}
/**
* Returns the moodle proxy configuration as a formatted url
*
* @return string the string to use for proxy settings.
*/
function get_moodle_proxy_url() {
global $CFG;
$proxy = '';
if (empty($CFG->proxytype)) {
return $proxy;
}
if (empty($CFG->proxyhost)) {
return $proxy;
}
if ($CFG->proxytype === 'SOCKS5') {
// If it is a SOCKS proxy, append the protocol info.
$protocol = 'socks5://';
} else {
$protocol = '';
}
$proxy = $CFG->proxyhost;
if (!empty($CFG->proxyport)) {
$proxy .= ':'. $CFG->proxyport;
}
if (!empty($CFG->proxyuser) && !empty($CFG->proxypassword)) {
$proxy = $protocol . $CFG->proxyuser . ':' . $CFG->proxypassword . '@' . $proxy;
}
return $proxy;
}
/**
* RESTful cURL class
*
* This is a wrapper class for curl, it is quite easy to use:
* <code>
* $c = new curl;
* // enable cache
* $c = new curl(array('cache'=>true));
* // enable cookie
* $c = new curl(array('cookie'=>true));
* // enable proxy
* $c = new curl(array('proxy'=>true));
*
* // HTTP GET Method
* $html = $c->get('http://example.com');
* // HTTP POST Method
* $html = $c->post('http://example.com/', array('q'=>'words', 'name'=>'moodle'));
* // HTTP PUT Method
* $html = $c->put('http://example.com/', array('file'=>'/var/www/test.txt');
* </code>
*
* @package core_files
* @category files
* @copyright Dongsheng Cai <dongsheng@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU Public License
*/
class curl {
/** @var curl_cache|false Caches http request contents */
public $cache = false;
/** @var bool Uses proxy, null means automatic based on URL */
public $proxy = null;
/** @var string library version */
public $version = '0.4 dev';
/** @var array http's response */
public $response = array();
/** @var array Raw response headers, needed for BC in download_file_content(). */
public $rawresponse = array();
/** @var array http header */
public $header = array();
/** @var array cURL information */
public $info;
/** @var string error */
public $error;
/** @var int error code */
public $errno;
/** @var bool Perform redirects at PHP level instead of relying on native cURL functionality. Always true now. */
public $emulateredirects = null;
/** @var array cURL options */
private $options;
/** @var string Proxy host */
private $proxy_host = '';
/** @var string Proxy auth */
private $proxy_auth = '';
/** @var string Proxy type */
private $proxy_type = '';
/** @var bool Debug mode on */
private $debug = false;
/** @var bool|string Path to cookie file */
private $cookie = false;
/** @var bool tracks multiple headers in response - redirect detection */
private $responsefinished = false;
/** @var security helper class, responsible for checking host/ports against allowed/blocked entries.*/
private $securityhelper;
/** @var bool ignoresecurity a flag which can be supplied to the constructor, allowing security to be bypassed. */
private $ignoresecurity;
/** @var array $mockresponses For unit testing only - return the head of this list instead of making the next request. */
private static $mockresponses = [];
/** @var array temporary params value if the value is not belongs to class stored_file. */
public $_tmp_file_post_params = [];
/**
* Curl constructor.
*
* Allowed settings are:
* proxy: (bool) use proxy server, null means autodetect non-local from url
* debug: (bool) use debug output
* cookie: (string) path to cookie file, false if none
* cache: (bool) use cache
* module_cache: (string) type of cache
* securityhelper: (\core\files\curl_security_helper_base) helper object providing URL checking for requests.
* ignoresecurity: (bool) set true to override and ignore the security helper when making requests.
*
* @param array $settings
*/
public function __construct($settings = array()) {
global $CFG;
if (!function_exists('curl_init')) {
$this->error = 'cURL module must be enabled!';
trigger_error($this->error, E_USER_ERROR);
return false;
}
// All settings of this class should be init here.
$this->resetopt();
if (!empty($settings['debug'])) {
$this->debug = true;
}
if (!empty($settings['cookie'])) {
if($settings['cookie'] === true) {
$this->cookie = $CFG->dataroot.'/curl_cookie.txt';
} else {
$this->cookie = $settings['cookie'];
}
}
if (!empty($settings['cache'])) {
if (class_exists('curl_cache')) {
if (!empty($settings['module_cache'])) {
$this->cache = new curl_cache($settings['module_cache']);
} else {
$this->cache = new curl_cache('misc');
}
}
}
if (!empty($CFG->proxyhost)) {
if (empty($CFG->proxyport)) {
$this->proxy_host = $CFG->proxyhost;
} else {
$this->proxy_host = $CFG->proxyhost.':'.$CFG->proxyport;
}
if (!empty($CFG->proxyuser) and !empty($CFG->proxypassword)) {
$this->proxy_auth = $CFG->proxyuser.':'.$CFG->proxypassword;
$this->setopt(array(
'proxyauth'=> CURLAUTH_BASIC | CURLAUTH_NTLM,
'proxyuserpwd'=>$this->proxy_auth));
}
if (!empty($CFG->proxytype)) {
if ($CFG->proxytype == 'SOCKS5') {
$this->proxy_type = CURLPROXY_SOCKS5;
} else {
$this->proxy_type = CURLPROXY_HTTP;
$this->setopt([
'httpproxytunnel' => false,
]);
if (defined('CURLOPT_SUPPRESS_CONNECT_HEADERS')) {
$this->setopt([
'suppress_connect_headers' => true,
]);
}
}
$this->setopt(array('proxytype'=>$this->proxy_type));
}
if (isset($settings['proxy'])) {
$this->proxy = $settings['proxy'];
}
} else {
$this->proxy = false;
}
// All redirects are performed at PHP level now and each one is checked against blocked URLs rules. We do not
// want to let cURL naively follow the redirect chain and visit every URL for security reasons. Even when the
// caller explicitly wants to ignore the security checks, we would need to fall back to the original
// implementation and use emulated redirects if open_basedir is in effect to avoid the PHP warning
// "CURLOPT_FOLLOWLOCATION cannot be activated when in safe_mode or an open_basedir". So it is better to simply
// ignore this property and always handle redirects at this PHP wrapper level and not inside the native cURL.
$this->emulateredirects = true;
// Curl security setup. Allow injection of a security helper, but if not found, default to the core helper.
if (isset($settings['securityhelper']) && $settings['securityhelper'] instanceof \core\files\curl_security_helper_base) {
$this->set_security($settings['securityhelper']);
} else {
$this->set_security(new \core\files\curl_security_helper());
}
$this->ignoresecurity = isset($settings['ignoresecurity']) ? $settings['ignoresecurity'] : false;
}
/**
* Resets the CURL options that have already been set
*/
public function resetopt() {
$this->options = array();
$this->options['CURLOPT_USERAGENT'] = \core_useragent::get_moodlebot_useragent();
// True to include the header in the output
$this->options['CURLOPT_HEADER'] = 0;
// True to Exclude the body from the output
$this->options['CURLOPT_NOBODY'] = 0;
// Redirect ny default.
$this->options['CURLOPT_FOLLOWLOCATION'] = 1;
$this->options['CURLOPT_MAXREDIRS'] = 10;
$this->options['CURLOPT_ENCODING'] = '';
// TRUE to return the transfer as a string of the return
// value of curl_exec() instead of outputting it out directly.
$this->options['CURLOPT_RETURNTRANSFER'] = 1;
$this->options['CURLOPT_SSL_VERIFYPEER'] = 0;
$this->options['CURLOPT_SSL_VERIFYHOST'] = 2;
$this->options['CURLOPT_CONNECTTIMEOUT'] = 30;
if ($cacert = self::get_cacert()) {
$this->options['CURLOPT_CAINFO'] = $cacert;
}
}
/**
* Get the location of ca certificates.
* @return string absolute file path or empty if default used
*/
public static function get_cacert() {
global $CFG;
// Bundle in dataroot always wins.
if (is_readable("$CFG->dataroot/moodleorgca.crt")) {
return realpath("$CFG->dataroot/moodleorgca.crt");
}
// Next comes the default from php.ini
$cacert = ini_get('curl.cainfo');
if (!empty($cacert) and is_readable($cacert)) {
return realpath($cacert);
}
// Windows PHP does not have any certs, we need to use something.
if ($CFG->ostype === 'WINDOWS') {
if (is_readable("$CFG->libdir/cacert.pem")) {
return realpath("$CFG->libdir/cacert.pem");
}
}
// Use default, this should work fine on all properly configured *nix systems.
return null;
}
/**
* Reset Cookie
*/
public function resetcookie() {
if (!empty($this->cookie)) {
if (is_file($this->cookie)) {
$fp = fopen($this->cookie, 'w');
if (!empty($fp)) {
fwrite($fp, '');
fclose($fp);
}
}
}
}
/**
* Set curl options.
*
* Do not use the curl constants to define the options, pass a string
* corresponding to that constant. Ie. to set CURLOPT_MAXREDIRS, pass
* array('CURLOPT_MAXREDIRS' => 10) or array('maxredirs' => 10) to this method.
*
* @param array $options If array is null, this function will reset the options to default value.
* @return void
* @throws coding_exception If an option uses constant value instead of option name.
*/
public function setopt($options = array()) {
if (is_array($options)) {
foreach ($options as $name => $val) {
if (!is_string($name)) {
throw new coding_exception('Curl options should be defined using strings, not constant values.');
}
if (stripos($name, 'CURLOPT_') === false) {
// Only prefix with CURLOPT_ if the option doesn't contain CURLINFO_,
// which is a valid prefix for at least one option CURLINFO_HEADER_OUT.
if (stripos($name, 'CURLINFO_') === false) {
$name = strtoupper('CURLOPT_'.$name);
}
} else {
$name = strtoupper($name);
}
$this->options[$name] = $val;
}
}
}
/**
* Reset http method
*/
public function cleanopt() {
unset($this->options['CURLOPT_HTTPGET']);
unset($this->options['CURLOPT_POST']);
unset($this->options['CURLOPT_POSTFIELDS']);
unset($this->options['CURLOPT_PUT']);
unset($this->options['CURLOPT_INFILE']);
unset($this->options['CURLOPT_INFILESIZE']);
unset($this->options['CURLOPT_CUSTOMREQUEST']);
unset($this->options['CURLOPT_FILE']);
}
/**
* Resets the HTTP Request headers (to prepare for the new request)
*/
public function resetHeader() {
$this->header = array();
}
/**
* Set HTTP Request Header
*
* @param array $header
*/
public function setHeader($header) {
if (is_array($header)) {
foreach ($header as $v) {
$this->setHeader($v);
}
} else {
// Remove newlines, they are not allowed in headers.
$newvalue = preg_replace('/[\r\n]/', '', $header);
if (!in_array($newvalue, $this->header)) {
$this->header[] = $newvalue;
}
}
}
/**
* Get HTTP Response Headers
* @return array of arrays
*/
public function getResponse() {
return $this->response;
}
/**
* Get raw HTTP Response Headers
* @return array of strings
*/
public function get_raw_response() {
return $this->rawresponse;
}
/**
* private callback function
* Formatting HTTP Response Header
*
* We only keep the last headers returned. For example during a redirect the
* redirect headers will not appear in {@link self::getResponse()}, if you need
* to use those headers, refer to {@link self::get_raw_response()}.
*
* @param resource $ch Apparently not used
* @param string $header
* @return int The strlen of the header
*/
private function formatHeader($ch, $header) {
$this->rawresponse[] = $header;
if (trim($header, "\r\n") === '') {
// This must be the last header.
$this->responsefinished = true;
}
if (strlen($header) > 2) {
if ($this->responsefinished) {
// We still have headers after the supposedly last header, we must be
// in a redirect so let's empty the response to keep the last headers.
$this->responsefinished = false;
$this->response = array();
}
$parts = explode(" ", rtrim($header, "\r\n"), 2);
$key = rtrim($parts[0], ':');
$value = isset($parts[1]) ? $parts[1] : null;
if (!empty($this->response[$key])) {
if (is_array($this->response[$key])) {
$this->response[$key][] = $value;
} else {
$tmp = $this->response[$key];
$this->response[$key] = array();
$this->response[$key][] = $tmp;
$this->response[$key][] = $value;
}
} else {
$this->response[$key] = $value;
}
}
return strlen($header);
}
/**
* Set options for individual curl instance
*
* @param resource|CurlHandle $curl A curl handle
* @param array $options
* @return resource The curl handle
*/
private function apply_opt($curl, $options) {
// Clean up
$this->cleanopt();
// set cookie
if (!empty($this->cookie) || !empty($options['cookie'])) {
$this->setopt(array('cookiejar'=>$this->cookie,
'cookiefile'=>$this->cookie
));
}
// Bypass proxy if required.
if ($this->proxy === null) {
if (!empty($this->options['CURLOPT_URL']) and is_proxybypass($this->options['CURLOPT_URL'])) {
$proxy = false;
} else {
$proxy = true;
}
} else {
$proxy = (bool)$this->proxy;
}
// Set proxy.
if ($proxy) {
$options['CURLOPT_PROXY'] = $this->proxy_host;
} else {
unset($this->options['CURLOPT_PROXY']);
}
$this->setopt($options);
// Reset before set options.
curl_setopt($curl, CURLOPT_HEADERFUNCTION, array(&$this,'formatHeader'));
// Setting the User-Agent based on options provided.
$useragent = '';
if (!empty($options['CURLOPT_USERAGENT'])) {
$useragent = $options['CURLOPT_USERAGENT'];
} else if (!empty($this->options['CURLOPT_USERAGENT'])) {
$useragent = $this->options['CURLOPT_USERAGENT'];
} else {
$useragent = \core_useragent::get_moodlebot_useragent();
}
// Set headers.
if (empty($this->header)) {
$this->setHeader(array(
'User-Agent: ' . $useragent,
'Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7',
'Connection: keep-alive'
));
} else if (!in_array('User-Agent: ' . $useragent, $this->header)) {
// Remove old User-Agent if one existed.
// We have to partial search since we don't know what the original User-Agent is.
if ($match = preg_grep('/User-Agent.*/', $this->header)) {
$key = array_keys($match)[0];
unset($this->header[$key]);
}
$this->setHeader(array('User-Agent: ' . $useragent));
}
curl_setopt($curl, CURLOPT_HTTPHEADER, $this->header);
if ($this->debug) {
echo '<h1>Options</h1>';
var_dump($this->options);
echo '<h1>Header</h1>';
var_dump($this->header);
}
// Do not allow infinite redirects.
if (!isset($this->options['CURLOPT_MAXREDIRS'])) {
$this->options['CURLOPT_MAXREDIRS'] = 0;
} else if ($this->options['CURLOPT_MAXREDIRS'] > 100) {
$this->options['CURLOPT_MAXREDIRS'] = 100;
} else {
$this->options['CURLOPT_MAXREDIRS'] = (int)$this->options['CURLOPT_MAXREDIRS'];
}
// Make sure we always know if redirects expected.
if (!isset($this->options['CURLOPT_FOLLOWLOCATION'])) {
$this->options['CURLOPT_FOLLOWLOCATION'] = 0;
}
// Limit the protocols to HTTP and HTTPS.
if (defined('CURLOPT_PROTOCOLS')) {
$this->options['CURLOPT_PROTOCOLS'] = (CURLPROTO_HTTP | CURLPROTO_HTTPS);
$this->options['CURLOPT_REDIR_PROTOCOLS'] = (CURLPROTO_HTTP | CURLPROTO_HTTPS);
}
// Set options.
foreach($this->options as $name => $val) {
if ($name === 'CURLOPT_FOLLOWLOCATION') {
// All the redirects are emulated at PHP level.
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 0);
continue;
}
$name = constant($name);
curl_setopt($curl, $name, $val);
}
return $curl;
}
/**
* Download multiple files in parallel
*
* Calls {@link multi()} with specific download headers
*
* <code>
* $c = new curl();
* $file1 = fopen('a', 'wb');
* $file2 = fopen('b', 'wb');
* $c->download(array(
* array('url'=>'http://localhost/', 'file'=>$file1),
* array('url'=>'http://localhost/20/', 'file'=>$file2)
* ));
* fclose($file1);
* fclose($file2);
* </code>
*
* or
*
* <code>
* $c = new curl();
* $c->download(array(
* array('url'=>'http://localhost/', 'filepath'=>'/tmp/file1.tmp'),
* array('url'=>'http://localhost/20/', 'filepath'=>'/tmp/file2.tmp')
* ));
* </code>
*
* @param array $requests An array of files to request {
* url => url to download the file [required]
* file => file handler, or
* filepath => file path
* }
* If 'file' and 'filepath' parameters are both specified in one request, the
* open file handle in the 'file' parameter will take precedence and 'filepath'
* will be ignored.
*
* @param array $options An array of options to set
* @return array An array of results
*/
public function download($requests, $options = array()) {
$options['RETURNTRANSFER'] = false;
return $this->multi($requests, $options);
}
/**
* Returns the current curl security helper.
*
* @return \core\files\curl_security_helper instance.
*/
public function get_security() {
return $this->securityhelper;
}
/**
* Sets the curl security helper.
*
* @param \core\files\curl_security_helper $securityobject instance/subclass of the base curl_security_helper class.
* @return bool true if the security helper could be set, false otherwise.
*/
public function set_security($securityobject) {
if ($securityobject instanceof \core\files\curl_security_helper) {
$this->securityhelper = $securityobject;
return true;
}
return false;
}
/**
* Multi HTTP Requests
* This function could run multi-requests in parallel.
*
* @param array $requests An array of files to request
* @param array $options An array of options to set
* @return array An array of results
*/
protected function multi($requests, $options = array()) {
$count = count($requests);
$handles = array();
$results = array();
$main = curl_multi_init();
for ($i = 0; $i < $count; $i++) {
if (!empty($requests[$i]['filepath']) and empty($requests[$i]['file'])) {
// open file
$requests[$i]['file'] = fopen($requests[$i]['filepath'], 'w');
$requests[$i]['auto-handle'] = true;
}
foreach($requests[$i] as $n=>$v) {
$options[$n] = $v;
}
$handles[$i] = curl_init($requests[$i]['url']);
$this->apply_opt($handles[$i], $options);
curl_multi_add_handle($main, $handles[$i]);
}
$running = 0;
do {
curl_multi_exec($main, $running);
} while($running > 0);
for ($i = 0; $i < $count; $i++) {
if (!empty($options['CURLOPT_RETURNTRANSFER'])) {
$results[] = true;
} else {
$results[] = curl_multi_getcontent($handles[$i]);
}
curl_multi_remove_handle($main, $handles[$i]);
}
curl_multi_close($main);
for ($i = 0; $i < $count; $i++) {
if (!empty($requests[$i]['filepath']) and !empty($requests[$i]['auto-handle'])) {
// close file handler if file is opened in this function
fclose($requests[$i]['file']);
}
}
return $results;
}
/**
* Helper function to reset the request state vars.
*
* @return void.
*/
protected function reset_request_state_vars() {
$this->info = array();
$this->error = '';
$this->errno = 0;
$this->response = array();
$this->rawresponse = array();
$this->responsefinished = false;
}
/**
* For use only in unit tests - we can pre-set the next curl response.
* This is useful for unit testing APIs that call external systems.
* @param string $response
*/
public static function mock_response($response) {
if ((defined('PHPUNIT_TEST') && PHPUNIT_TEST)) {
array_push(self::$mockresponses, $response);
} else {
throw new coding_exception('mock_response function is only available for unit tests.');
}
}
/**
* check_securityhelper_blocklist.
* Checks whether the given URL is blocked by checking both plugin's security helpers
* and core curl security helper or any curl security helper that passed to curl class constructor.
* If ignoresecurity is set to true, skip checking and consider the url is not blocked.
* This augments all installed plugin's security helpers if there is any.
*
* @param string $url the url to check.
* @return string - an error message if URL is blocked or null if URL is not blocked.
*/
protected function check_securityhelper_blocklist(string $url): ?string {
// If curl security is not enabled, do not proceed.
if ($this->ignoresecurity) {
return null;
}
// Augment all installed plugin's security helpers if there is any.
// The plugin's function has to be defined as plugintype_pluginname_curl_security_helper in pluginname/lib.php.
$plugintypes = get_plugins_with_function('curl_security_helper');
// If any of the security helper's function returns true, treat as URL is blocked.
foreach ($plugintypes as $plugins) {
foreach ($plugins as $pluginfunction) {
// Get curl security helper object from plugin lib.php.
$pluginsecurityhelper = $pluginfunction();
if ($pluginsecurityhelper instanceof \core\files\curl_security_helper_base) {
if ($pluginsecurityhelper->url_is_blocked($url)) {
$this->error = $pluginsecurityhelper->get_blocked_url_string();
return $this->error;
}
}
}
}
// Check if the URL is blocked in core curl_security_helper or
// curl security helper that passed to curl class constructor.
if ($this->securityhelper->url_is_blocked($url)) {
$this->error = $this->securityhelper->get_blocked_url_string();
return $this->error;
}
return null;
}
/**
* Single HTTP Request
*
* @param string $url The URL to request
* @param array $options
* @return bool
*/
protected function request($url, $options = array()) {
// Reset here so that the data is valid when result returned from cache, or if we return due to a blocked URL hit.
$this->reset_request_state_vars();
if ((defined('PHPUNIT_TEST') && PHPUNIT_TEST)) {
$mockresponse = array_pop(self::$mockresponses);
if ($mockresponse !== null) {
$this->info = [ 'http_code' => 200 ];
return $mockresponse;
}
}
if (empty($this->emulateredirects)) {
// Just in case someone had tried to explicitly disable emulated redirects in legacy code.
debugging('Attempting to disable emulated redirects has no effect any more!', DEBUG_DEVELOPER);
}
$urlisblocked = $this->check_securityhelper_blocklist($url);
if (!is_null($urlisblocked)) {
> $this->trigger_url_blocked_event($url, $urlisblocked);
return $urlisblocked;
}
// Set the URL as a curl option.
$this->setopt(array('CURLOPT_URL' => $url));
// Create curl instance.
$curl = curl_init();
$this->apply_opt($curl, $options);
if ($this->cache && $ret = $this->cache->get($this->options)) {
return $ret;
}
$ret = curl_exec($curl);
$this->info = curl_getinfo($curl);
$this->error = curl_error($curl);
$this->errno = curl_errno($curl);
// Note: $this->response and $this->rawresponse are filled by $hits->formatHeader callback.
if (intval($this->info['redirect_count']) > 0) {
// For security reasons we do not allow the cURL handle to follow redirects on its own.
// See setting CURLOPT_FOLLOWLOCATION in {@see self::apply_opt()} method.
throw new coding_exception('Internal cURL handle should never follow redirects on its own!',
'Reported number of redirects: ' . $this->info['redirect_count']);
}
if ($this->options['CURLOPT_FOLLOWLOCATION'] && $this->info['http_code'] != 200) {
$redirects = 0;
while($redirects <= $this->options['CURLOPT_MAXREDIRS']) {
if ($this->info['http_code'] == 301) {
// Moved Permanently - repeat the same request on new URL.
} else if ($this->info['http_code'] == 302) {
// Found - the standard redirect - repeat the same request on new URL.
} else if ($this->info['http_code'] == 303) {
// 303 See Other - repeat only if GET, do not bother with POSTs.
if (empty($this->options['CURLOPT_HTTPGET'])) {
break;
}
} else if ($this->info['http_code'] == 307) {
// Temporary Redirect - must repeat using the same request type.
} else if ($this->info['http_code'] == 308) {
// Permanent Redirect - must repeat using the same request type.
} else {
// Some other http code means do not retry!
break;
}
$redirects++;
$redirecturl = null;
if (isset($this->info['redirect_url'])) {
if (preg_match('|^https?://|i', $this->info['redirect_url'])) {
$redirecturl = $this->info['redirect_url'];
} else {
// Emulate CURLOPT_REDIR_PROTOCOLS behaviour which we have set to (CURLPROTO_HTTP | CURLPROTO_HTTPS) only.
$this->errno = CURLE_UNSUPPORTED_PROTOCOL;
$this->error = 'Redirect to a URL with unsuported protocol: ' . $this->info['redirect_url'];
curl_close($curl);
return $this->error;
}
}
if (!$redirecturl) {
foreach ($this->response as $k => $v) {
if (strtolower($k) === 'location') {
$redirecturl = $v;
break;
}
}
if (preg_match('|^https?://|i', $redirecturl)) {
// Great, this is the correct location format!
} else if ($redirecturl) {
$current = curl_getinfo($curl, CURLINFO_EFFECTIVE_URL);
if (strpos($redirecturl, '/') === 0) {
// Relative to server root - just guess.
$pos = strpos('/', $current, 8);
if ($pos === false) {
$redirecturl = $current.$redirecturl;
} else {
$redirecturl = substr($current, 0, $pos).$redirecturl;
}
} else {
// Relative to current script.
$redirecturl = dirname($current).'/'.$redirecturl;
}
}
}
$urlisblocked = $this->check_securityhelper_blocklist($redirecturl);
if (!is_null($urlisblocked)) {
$this->reset_request_state_vars();
curl_close($curl);
> $this->trigger_url_blocked_event($redirecturl, $urlisblocked, true);
return $urlisblocked;
}
// If the response body is written to a seekable stream resource, reset the stream pointer to avoid
// appending multiple response bodies to the same resource.
if (!empty($this->options['CURLOPT_FILE'])) {
$streammetadata = stream_get_meta_data($this->options['CURLOPT_FILE']);
if ($streammetadata['seekable']) {
ftruncate($this->options['CURLOPT_FILE'], 0);
rewind($this->options['CURLOPT_FILE']);
}
}
curl_setopt($curl, CURLOPT_URL, $redirecturl);
$ret = curl_exec($curl);
$this->info = curl_getinfo($curl);
$this->error = curl_error($curl);
$this->errno = curl_errno($curl);
$this->info['redirect_count'] = $redirects;
if ($this->info['http_code'] === 200) {
// Finally this is what we wanted.
break;
}
if ($this->errno != CURLE_OK) {
// Something wrong is going on.
break;
}
}
if ($redirects > $this->options['CURLOPT_MAXREDIRS']) {
$this->errno = CURLE_TOO_MANY_REDIRECTS;
$this->error = 'Maximum ('.$this->options['CURLOPT_MAXREDIRS'].') redirects followed';
}
}
if ($this->cache) {
$this->cache->set($this->options, $ret);
}
if ($this->debug) {
echo '<h1>Return Data</h1>';
var_dump($ret);
echo '<h1>Info</h1>';
var_dump($this->info);
echo '<h1>Error</h1>';
var_dump($this->error);
}
curl_close($curl);
if (empty($this->error)) {
return $ret;
} else {
return $this->error;
// exception is not ajax friendly
//throw new moodle_exception($this->error, 'curl');
}
}
/**
> * Trigger url_blocked event
* HTTP HEAD method
> *
*
> * @param string $url The URL to request
* @see request()
> * @param string $reason Reason for blocking
*
> * @param bool $redirect true if it was a redirect
* @param string $url
> */
* @param array $options
> private function trigger_url_blocked_event($url, $reason, $redirect = false): void {
* @return bool
> $params = [
*/
> 'url' => $url,
public function head($url, $options = array()) {
> 'reason' => $reason,
$options['CURLOPT_HTTPGET'] = 0;
> 'redirect' => $redirect,
$options['CURLOPT_HEADER'] = 1;
> ];
$options['CURLOPT_NOBODY'] = 1;
> $event = core\event\url_blocked::create(['other' => $params]);
return $this->request($url, $options);
> $event->trigger();
}
> }
>
/**
> /**
* HTTP PATCH method
*
* @param string $url
* @param array|string $params
* @param array $options
* @return bool
*/
public function patch($url, $params = '', $options = array()) {
$options['CURLOPT_CUSTOMREQUEST'] = 'PATCH';
if (is_array($params)) {
$this->_tmp_file_post_params = array();
foreach ($params as $key => $value) {
if ($value instanceof stored_file) {
$value->add_to_curl_request($this, $key);
} else {
$this->_tmp_file_post_params[$key] = $value;
}
}
$options['CURLOPT_POSTFIELDS'] = $this->_tmp_file_post_params;
unset($this->_tmp_file_post_params);
} else {
// The variable $params is the raw post data.
$options['CURLOPT_POSTFIELDS'] = $params;
}
return $this->request($url, $options);
}
/**
* HTTP POST method
*
* @param string $url
* @param array|string $params
* @param array $options
* @return bool
*/
public function post($url, $params = '', $options = array()) {
$options['CURLOPT_POST'] = 1;
if (is_array($params)) {
$this->_tmp_file_post_params = array();
foreach ($params as $key => $value) {
if ($value instanceof stored_file) {
$value->add_to_curl_request($this, $key);
} else {
$this->_tmp_file_post_params[$key] = $value;
}
}
$options['CURLOPT_POSTFIELDS'] = $this->_tmp_file_post_params;
unset($this->_tmp_file_post_params);
} else {
// $params is the raw post data
$options['CURLOPT_POSTFIELDS'] = $params;
}
return $this->request($url, $options);
}
/**
* HTTP GET method
*
* @param string $url
* @param array $params
* @param array $options
* @return bool
*/
public function get($url, $params = array(), $options = array()) {
$options['CURLOPT_HTTPGET'] = 1;
if (!empty($params)) {
$url .= (stripos($url, '?') !== false) ? '&' : '?';
$url .= http_build_query($params, '', '&');
}
return $this->request($url, $options);
}
/**
* Downloads one file and writes it to the specified file handler
*
* <code>
* $c = new curl();
* $file = fopen('savepath', 'w');
* $result = $c->download_one('http://localhost/', null,
* array('file' => $file, 'timeout' => 5, 'followlocation' => true, 'maxredirs' => 3));
* fclose($file);
* $download_info = $c->get_info();
* if ($result === true) {
* // file downloaded successfully
* } else {
* $error_text = $result;
* $error_code = $c->get_errno();
* }
* </code>
*
* <code>
* $c = new curl();
* $result = $c->download_one('http://localhost/', null,
* array('filepath' => 'savepath', 'timeout' => 5, 'followlocation' => true, 'maxredirs' => 3));
* // ... see above, no need to close handle and remove file if unsuccessful
* </code>
*
* @param string $url
* @param array|null $params key-value pairs to be added to $url as query string
* @param array $options request options. Must include either 'file' or 'filepath'
* @return bool|string true on success or error string on failure
*/
public function download_one($url, $params, $options = array()) {
$options['CURLOPT_HTTPGET'] = 1;
if (!empty($params)) {
$url .= (stripos($url, '?') !== false) ? '&' : '?';
$url .= http_build_query($params, '', '&');
}
if (!empty($options['filepath']) && empty($options['file'])) {
// open file
if (!($options['file'] = fopen($options['filepath'], 'w'))) {
$this->errno = 100;
return get_string('cannotwritefile', 'error', $options['filepath']);
}
$filepath = $options['filepath'];
}
unset($options['filepath']);
$result = $this->request($url, $options);
if (isset($filepath)) {
fclose($options['file']);
if ($result !== true) {
unlink($filepath);
}
}
return $result;
}
/**
* HTTP PUT method
*
* @param string $url
* @param array $params
* @param array $options
* @return bool
*/
public function put($url, $params = array(), $options = array()) {
$file = '';
$fp = false;
if (isset($params['file'])) {
$file = $params['file'];
if (is_file($file)) {
$fp = fopen($file, 'r');
$size = filesize($file);
$options['CURLOPT_PUT'] = 1;
$options['CURLOPT_INFILESIZE'] = $size;
$options['CURLOPT_INFILE'] = $fp;
} else {
return null;
}
if (!isset($this->options['CURLOPT_USERPWD'])) {
$this->setopt(array('CURLOPT_USERPWD' => 'anonymous: noreply@moodle.org'));
}
} else {
$options['CURLOPT_CUSTOMREQUEST'] = 'PUT';
$options['CURLOPT_POSTFIELDS'] = $params;
}
$ret = $this->request($url, $options);
if ($fp !== false) {
fclose($fp);
}
return $ret;
}
/**
* HTTP DELETE method
*
* @param string $url
* @param array $param
* @param array $options
* @return bool
*/
public function delete($url, $param = array(), $options = array()) {
$options['CURLOPT_CUSTOMREQUEST'] = 'DELETE';
if (!isset($options['CURLOPT_USERPWD'])) {
$options['CURLOPT_USERPWD'] = 'anonymous: noreply@moodle.org';
}
$ret = $this->request($url, $options);
return $ret;
}
/**
* HTTP TRACE method
*
* @param string $url
* @param array $options
* @return bool
*/
public function trace($url, $options = array()) {
$options['CURLOPT_CUSTOMREQUEST'] = 'TRACE';
$ret = $this->request($url, $options);
return $ret;
}
/**
* HTTP OPTIONS method
*
* @param string $url
* @param array $options
* @return bool
*/
public function options($url, $options = array()) {
$options['CURLOPT_CUSTOMREQUEST'] = 'OPTIONS';
$ret = $this->request($url, $options);
return $ret;
}
/**
* Get curl information
*
* @return array
*/
public function get_info() {
return $this->info;
}
/**
* Get curl error code
*
* @return int
*/
public function get_errno() {
return $this->errno;
}
/**
* When using a proxy, an additional HTTP response code may appear at
* the start of the header. For example, when using https over a proxy
* there may be 'HTTP/1.0 200 Connection Established'. Other codes are
* also possible and some may come with their own headers.
*
* If using the return value containing all headers, this function can be
* called to remove unwanted doubles.
*
* Note that it is not possible to distinguish this situation from valid
* data unless you know the actual response part (below the headers)
* will not be included in this string, or else will not 'look like' HTTP
* headers. As a result it is not safe to call this function for general
* data.
*
* @param string $input Input HTTP response
* @return string HTTP response with additional headers stripped if any
*/
public static function strip_double_headers($input) {
// I have tried to make this regular expression as specific as possible
// to avoid any case where it does weird stuff if you happen to put
// HTTP/1.1 200 at the start of any line in your RSS file. This should
// also make it faster because it can abandon regex processing as soon
// as it hits something that doesn't look like an http header. The
// header definition is taken from RFC 822, except I didn't support
// folding which is never used in practice.
$crlf = "\r\n";
return preg_replace(
// HTTP version and status code (ignore value of code).
'~^HTTP/[1-9](\.[0-9])?.*' . $crlf .
// Header name: character between 33 and 126 decimal, except colon.
// Colon. Header value: any character except \r and \n. CRLF.
'(?:[\x21-\x39\x3b-\x7e]+:[^' . $crlf . ']+' . $crlf . ')*' .
// Headers are terminated by another CRLF (blank line).
$crlf .
// Second HTTP status code, this time must be 200.
'(HTTP/[1-9](\.[0-9])? 200)~', '$2', $input);
}
}
/**
* This class is used by cURL class, use case:
*
* <code>
* $CFG->repositorycacheexpire = 120;
* $CFG->curlcache = 120;
*
* $c = new curl(array('cache'=>true), 'module_cache'=>'repository');
* $ret = $c->get('http://www.google.com');
* </code>
*
* @package core_files
* @copyright Dongsheng Cai <dongsheng@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class curl_cache {
/** @var string Path to cache directory */
public $dir = '';
/** @var int the repositorycacheexpire config value. */
private $ttl;
/**
* Constructor
*
* @global stdClass $CFG
* @param string $module which module is using curl_cache
*/
public function __construct($module = 'repository') {
global $CFG;
if (!empty($module)) {
$this->dir = $CFG->cachedir.'/'.$module.'/';
} else {
$this->dir = $CFG->cachedir.'/misc/';
}
if (!file_exists($this->dir)) {
mkdir($this->dir, $CFG->directorypermissions, true);
}
if ($module == 'repository') {
if (empty($CFG->repositorycacheexpire)) {
$CFG->repositorycacheexpire = 120;
}
$this->ttl = $CFG->repositorycacheexpire;
} else {
if (empty($CFG->curlcache)) {
$CFG->curlcache = 120;
}
$this->ttl = $CFG->curlcache;
}
}
/**
* Get cached value
*
* @global stdClass $CFG
* @global stdClass $USER
* @param mixed $param
* @return bool|string
*/
public function get($param) {
global $CFG, $USER;
$this->cleanup($this->ttl);
$filename = 'u'.$USER->id.'_'.md5(serialize($param));
if(file_exists($this->dir.$filename)) {
$lasttime = filemtime($this->dir.$filename);
if (time()-$lasttime > $this->ttl) {
return false;
} else {
$fp = fopen($this->dir.$filename, 'r');
$size = filesize($this->dir.$filename);
$content = fread($fp, $size);
return unserialize($content);
}
}
return false;
}
/**
* Set cache value
*
* @global object $CFG
* @global object $USER
* @param mixed $param
* @param mixed $val
*/
public function set($param, $val) {
global $CFG, $USER;
$filename = 'u'.$USER->id.'_'.md5(serialize($param));
$fp = fopen($this->dir.$filename, 'w');
fwrite($fp, serialize($val));
fclose($fp);
@chmod($this->dir.$filename, $CFG->filepermissions);
}
/**
* Remove cache files
*
* @param int $expire The number of seconds before expiry
*/
public function cleanup($expire) {
if ($dir = opendir($this->dir)) {
while (false !== ($file = readdir($dir))) {
if(!is_dir($file) && $file != '.' && $file != '..') {
$lasttime = @filemtime($this->dir.$file);
if (time() - $lasttime > $expire) {
@unlink($this->dir.$file);
}
}
}
closedir($dir);
}
}
/**
* delete current user's cache file
*
* @global object $CFG
* @global object $USER
*/
public function refresh() {
global $CFG, $USER;
if ($dir = opendir($this->dir)) {
while (false !== ($file = readdir($dir))) {
if (!is_dir($file) && $file != '.' && $file != '..') {
if (strpos($file, 'u'.$USER->id.'_') !== false) {
@unlink($this->dir.$file);
}
}
}
}
}
}
/**
* This function delegates file serving to individual plugins
*
* @param string $relativepath
* @param bool $forcedownload
* @param null|string $preview the preview mode, defaults to serving the original file
* @param boolean $offline If offline is requested - don't serve a redirect to an external file, return a file suitable for viewing
* offline (e.g. mobile app).
* @param bool $embed Whether this file will be served embed into an iframe.
* @todo MDL-31088 file serving improments
*/
function file_pluginfile($relativepath, $forcedownload, $preview = null, $offline = false, $embed = false) {
global $DB, $CFG, $USER, $OUTPUT;
// relative path must start with '/'
if (!$relativepath) {
throw new \moodle_exception('invalidargorconf');
} else if ($relativepath[0] != '/') {
throw new \moodle_exception('pathdoesnotstartslash');
}
// extract relative path components
$args = explode('/', ltrim($relativepath, '/'));
if (count($args) < 3) { // always at least context, component and filearea
throw new \moodle_exception('invalidarguments');
}
$contextid = (int)array_shift($args);
$component = clean_param(array_shift($args), PARAM_COMPONENT);
$filearea = clean_param(array_shift($args), PARAM_AREA);
list($context, $course, $cm) = get_context_info_array($contextid);
$fs = get_file_storage();
$sendfileoptions = ['preview' => $preview, 'offline' => $offline, 'embed' => $embed];
// ========================================================================================================================
if ($component === 'blog') {
// Blog file serving
if ($context->contextlevel != CONTEXT_SYSTEM) {
send_file_not_found();
}
if ($filearea !== 'attachment' and $filearea !== 'post') {
send_file_not_found();
}
if (empty($CFG->enableblogs)) {
throw new \moodle_exception('siteblogdisable', 'blog');
}
$entryid = (int)array_shift($args);
if (!$entry = $DB->get_record('post', array('module'=>'blog', 'id'=>$entryid))) {
send_file_not_found();
}
if ($CFG->bloglevel < BLOG_GLOBAL_LEVEL) {
require_login();
if (isguestuser()) {
throw new \moodle_exception('noguest');
}
if ($CFG->bloglevel == BLOG_USER_LEVEL) {
if ($USER->id != $entry->userid) {
send_file_not_found();
}
}
}
if ($entry->publishstate === 'public') {
if ($CFG->forcelogin) {
require_login();
}
} else if ($entry->publishstate === 'site') {
require_login();
//ok
} else if ($entry->publishstate === 'draft') {
require_login();
if ($USER->id != $entry->userid) {
send_file_not_found();
}
}
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, $component, $filearea, $entryid, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
send_stored_file($file, 10*60, 0, true, $sendfileoptions); // download MUST be forced - security!
// ========================================================================================================================
} else if ($component === 'grade') {
require_once($CFG->libdir . '/grade/constants.php');
if (($filearea === 'outcome' or $filearea === 'scale') and $context->contextlevel == CONTEXT_SYSTEM) {
// Global gradebook files
if ($CFG->forcelogin) {
require_login();
}
$fullpath = "/$context->id/$component/$filearea/".implode('/', $args);
if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
send_file_not_found();
}
\core\session\manager::write_close(); // Unlock session during file serving.
send_stored_file($file, 60*60, 0, $forcedownload, $sendfileoptions);
} else if ($filearea == GRADE_FEEDBACK_FILEAREA || $filearea == GRADE_HISTORY_FEEDBACK_FILEAREA) {
if ($context->contextlevel != CONTEXT_MODULE) {
send_file_not_found();
}
require_login($course, false);
$gradeid = (int) array_shift($args);
$filename = array_pop($args);
if ($filearea == GRADE_HISTORY_FEEDBACK_FILEAREA) {
$grade = $DB->get_record('grade_grades_history', ['id' => $gradeid]);
} else {
$grade = $DB->get_record('grade_grades', ['id' => $gradeid]);
}
if (!$grade) {
send_file_not_found();
}
$iscurrentuser = $USER->id == $grade->userid;
if (!$iscurrentuser) {
$coursecontext = context_course::instance($course->id);
if (!has_capability('moodle/grade:viewall', $coursecontext)) {
send_file_not_found();
}
}
$fullpath = "/$context->id/$component/$filearea/$gradeid/$filename";
if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
send_file_not_found();
}
\core\session\manager::write_close(); // Unlock session during file serving.
send_stored_file($file, 60*60, 0, $forcedownload, $sendfileoptions);
} else {
send_file_not_found();
}
// ========================================================================================================================
} else if ($component === 'tag') {
if ($filearea === 'description' and $context->contextlevel == CONTEXT_SYSTEM) {
// All tag descriptions are going to be public but we still need to respect forcelogin
if ($CFG->forcelogin) {
require_login();
}
$fullpath = "/$context->id/tag/description/".implode('/', $args);
if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
send_file_not_found();
}
\core\session\manager::write_close(); // Unlock session during file serving.
send_stored_file($file, 60*60, 0, true, $sendfileoptions);
} else {
send_file_not_found();
}
// ========================================================================================================================
} else if ($component === 'badges') {
require_once($CFG->libdir . '/badgeslib.php');
$badgeid = (int)array_shift($args);
$badge = new badge($badgeid);
$filename = array_pop($args);
if ($filearea === 'badgeimage') {
if ($filename !== 'f1' && $filename !== 'f2' && $filename !== 'f3') {
send_file_not_found();
}
if (!$file = $fs->get_file($context->id, 'badges', 'badgeimage', $badge->id, '/', $filename.'.png')) {
send_file_not_found();
}
\core\session\manager::write_close();
send_stored_file($file, 60*60, 0, $forcedownload, $sendfileoptions);
} else if ($filearea === 'userbadge' and $context->contextlevel == CONTEXT_USER) {
if (!$file = $fs->get_file($context->id, 'badges', 'userbadge', $badge->id, '/', $filename.'.png')) {
send_file_not_found();
}
\core\session\manager::write_close();
send_stored_file($file, 60*60, 0, true, $sendfileoptions);
}
// ========================================================================================================================
} else if ($component === 'calendar') {
if ($filearea === 'event_description' and $context->contextlevel == CONTEXT_SYSTEM) {
// All events here are public the one requirement is that we respect forcelogin
if ($CFG->forcelogin) {
require_login();
}
// Get the event if from the args array
$eventid = array_shift($args);
// Load the event from the database
if (!$event = $DB->get_record('event', array('id'=>(int)$eventid, 'eventtype'=>'site'))) {
send_file_not_found();
}
// Get the file and serve if successful
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, $component, $filearea, $eventid, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
\core\session\manager::write_close(); // Unlock session during file serving.
send_stored_file($file, 60*60, 0, $forcedownload, $sendfileoptions);
} else if ($filearea === 'event_description' and $context->contextlevel == CONTEXT_USER) {
// Must be logged in, if they are not then they obviously can't be this user
require_login();
// Don't want guests here, potentially saves a DB call
if (isguestuser()) {
send_file_not_found();
}
// Get the event if from the args array
$eventid = array_shift($args);
// Load the event from the database - user id must match
if (!$event = $DB->get_record('event', array('id'=>(int)$eventid, 'userid'=>$USER->id, 'eventtype'=>'user'))) {
send_file_not_found();
}
// Get the file and serve if successful
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, $component, $filearea, $eventid, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
\core\session\manager::write_close(); // Unlock session during file serving.
send_stored_file($file, 0, 0, true, $sendfileoptions);
} else if ($filearea === 'event_description' and $context->contextlevel == CONTEXT_COURSECAT) {
if ($CFG->forcelogin) {
require_login();
}
// Get category, this will also validate access.
$category = core_course_category::get($context->instanceid);
// Get the event ID from the args array, load event.
$eventid = array_shift($args);
$event = $DB->get_record('event', [
'id' => (int) $eventid,
'eventtype' => 'category',
'categoryid' => $category->id,
]);
if (!$event) {
send_file_not_found();
}
// Retrieve file from storage, and serve.
$filename = array_pop($args);
$filepath = $args ? '/' . implode('/', $args) .'/' : '/';
$file = $fs->get_file($context->id, $component, $filearea, $eventid, $filepath, $filename);
if (!$file || $file->is_directory()) {
send_file_not_found();
}
// Unlock session during file serving.
\core\session\manager::write_close();
send_stored_file($file, HOURSECS, 0, $forcedownload, $sendfileoptions);
} else if ($filearea === 'event_description' and $context->contextlevel == CONTEXT_COURSE) {
// Respect forcelogin and require login unless this is the site.... it probably
// should NEVER be the site
if ($CFG->forcelogin || $course->id != SITEID) {
require_login($course);
}
// Must be able to at least view the course. This does not apply to the front page.
if ($course->id != SITEID && (!is_enrolled($context)) && (!is_viewing($context))) {
//TODO: hmm, do we really want to block guests here?
send_file_not_found();
}
// Get the event id
$eventid = array_shift($args);
// Load the event from the database we need to check whether it is
// a) valid course event
// b) a group event
// Group events use the course context (there is no group context)
if (!$event = $DB->get_record('event', array('id'=>(int)$eventid, 'courseid'=>$course->id))) {
send_file_not_found();
}
// If its a group event require either membership of view all groups capability
if ($event->eventtype === 'group') {
if (!has_capability('moodle/site:accessallgroups', $context) && !groups_is_member($event->groupid, $USER->id)) {
send_file_not_found();
}
} else if ($event->eventtype === 'course' || $event->eventtype === 'site') {
// Ok. Please note that the event type 'site' still uses a course context.
} else {
// Some other type.
send_file_not_found();
}
// If we get this far we can serve the file
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, $component, $filearea, $eventid, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
\core\session\manager::write_close(); // Unlock session during file serving.
send_stored_file($file, 60*60, 0, $forcedownload, $sendfileoptions);
} else {
send_file_not_found();
}
// ========================================================================================================================
} else if ($component === 'user') {
if ($filearea === 'icon' and $context->contextlevel == CONTEXT_USER) {
if (count($args) == 1) {
$themename = theme_config::DEFAULT_THEME;
$filename = array_shift($args);
} else {
$themename = array_shift($args);
$filename = array_shift($args);
}
// fix file name automatically
if ($filename !== 'f1' and $filename !== 'f2' and $filename !== 'f3') {
$filename = 'f1';
}
if ((!empty($CFG->forcelogin) and !isloggedin()) ||
(!empty($CFG->forceloginforprofileimage) && (!isloggedin() || isguestuser()))) {
// protect images if login required and not logged in;
// also if login is required for profile images and is not logged in or guest
// do not use require_login() because it is expensive and not suitable here anyway
$theme = theme_config::load($themename);
redirect($theme->image_url('u/'.$filename, 'moodle')); // intentionally not cached
}
if (!$file = $fs->get_file($context->id, 'user', 'icon', 0, '/', $filename.'.png')) {
if (!$file = $fs->get_file($context->id, 'user', 'icon', 0, '/', $filename.'.jpg')) {
if ($filename === 'f3') {
// f3 512x512px was introduced in 2.3, there might be only the smaller version.
if (!$file = $fs->get_file($context->id, 'user', 'icon', 0, '/', 'f1.png')) {
$file = $fs->get_file($context->id, 'user', 'icon', 0, '/', 'f1.jpg');
}
}
}
}
if (!$file) {
// bad reference - try to prevent future retries as hard as possible!
if ($user = $DB->get_record('user', array('id'=>$context->instanceid), 'id, picture')) {
if ($user->picture > 0) {
$DB->set_field('user', 'picture', 0, array('id'=>$user->id));
}
}
// no redirect here because it is not cached
$theme = theme_config::load($themename);
$imagefile = $theme->resolve_image_location('u/'.$filename, 'moodle', null);
send_file($imagefile, basename($imagefile), 60*60*24*14);
}
$options = $sendfileoptions;
if (empty($CFG->forcelogin) && empty($CFG->forceloginforprofileimage)) {
// Profile images should be cache-able by both browsers and proxies according
// to $CFG->forcelogin and $CFG->forceloginforprofileimage.
$options['cacheability'] = 'public';
}
send_stored_file($file, 60*60*24*365, 0, false, $options); // enable long caching, there are many images on each page
} else if ($filearea === 'private' and $context->contextlevel == CONTEXT_USER) {
require_login();
if (isguestuser()) {
send_file_not_found();
}
if ($USER->id !== $context->instanceid) {
send_file_not_found();
}
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, $component, $filearea, 0, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
\core\session\manager::write_close(); // Unlock session during file serving.
send_stored_file($file, 0, 0, true, $sendfileoptions); // must force download - security!
} else if ($filearea === 'profile' and $context->contextlevel == CONTEXT_USER) {
if ($CFG->forcelogin) {
require_login();
}
$userid = $context->instanceid;
if (!empty($CFG->forceloginforprofiles)) {
require_once("{$CFG->dirroot}/user/lib.php");
require_login();
// Verify the current user is able to view the profile of the supplied user anywhere.
$user = core_user::get_user($userid);
if (!user_can_view_profile($user, null, $context)) {
send_file_not_found();
}
}
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, $component, $filearea, 0, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
\core\session\manager::write_close(); // Unlock session during file serving.
send_stored_file($file, 0, 0, true, $sendfileoptions); // must force download - security!
} else if ($filearea === 'profile' and $context->contextlevel == CONTEXT_COURSE) {
$userid = (int)array_shift($args);
$usercontext = context_user::instance($userid);
if ($CFG->forcelogin) {
require_login();
}
if (!empty($CFG->forceloginforprofiles)) {
require_once("{$CFG->dirroot}/user/lib.php");
require_login();
// Verify the current user is able to view the profile of the supplied user in current course.
$user = core_user::get_user($userid);
if (!user_can_view_profile($user, $course, $usercontext)) {
send_file_not_found();
}
}
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($usercontext->id, 'user', 'profile', 0, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
\core\session\manager::write_close(); // Unlock session during file serving.
send_stored_file($file, 0, 0, true, $sendfileoptions); // must force download - security!
} else if ($filearea === 'backup' and $context->contextlevel == CONTEXT_USER) {
require_login();
if (isguestuser()) {
send_file_not_found();
}
$userid = $context->instanceid;
if ($USER->id != $userid) {
send_file_not_found();
}
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'user', 'backup', 0, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
\core\session\manager::write_close(); // Unlock session during file serving.
send_stored_file($file, 0, 0, true, $sendfileoptions); // must force download - security!
} else {
send_file_not_found();
}
// ========================================================================================================================
} else if ($component === 'coursecat') {
if ($context->contextlevel != CONTEXT_COURSECAT) {
send_file_not_found();
}
if ($filearea === 'description') {
if ($CFG->forcelogin) {
// no login necessary - unless login forced everywhere
require_login();
}
// Check if user can view this category.
if (!core_course_category::get($context->instanceid, IGNORE_MISSING)) {
send_file_not_found();
}
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'coursecat', 'description', 0, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
\core\session\manager::write_close(); // Unlock session during file serving.
send_stored_file($file, 60*60, 0, $forcedownload, $sendfileoptions);
} else {
send_file_not_found();
}
// ========================================================================================================================
} else if ($component === 'course') {
if ($context->contextlevel != CONTEXT_COURSE) {
send_file_not_found();
}
if ($filearea === 'summary' || $filearea === 'overviewfiles') {
if ($CFG->forcelogin) {
require_login();
}
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'course', $filearea, 0, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
\core\session\manager::write_close(); // Unlock session during file serving.
send_stored_file($file, 60*60, 0, $forcedownload, $sendfileoptions);
} else if ($filearea === 'section') {
if ($CFG->forcelogin) {
require_login($course);
} else if ($course->id != SITEID) {
require_login($course);
}
$sectionid = (int)array_shift($args);
if (!$section = $DB->get_record('course_sections', array('id'=>$sectionid, 'course'=>$course->id))) {
send_file_not_found();
}
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'course', 'section', $sectionid, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
\core\session\manager::write_close(); // Unlock session during file serving.
send_stored_file($file, 60*60, 0, $forcedownload, $sendfileoptions);
} else if ($filearea === 'generated') {
if ($CFG->forcelogin) {
require_login($course);
} else if ($course->id != SITEID) {
require_login($course);
}
$svg = $OUTPUT->get_generated_svg_for_id($course->id);
\core\session\manager::write_close(); // Unlock session during file serving.
send_file($svg, 'course.svg', 60 * 60, 0, true, $forcedownload);
} else {
send_file_not_found();
}
} else if ($component === 'cohort') {
$cohortid = (int)array_shift($args);
$cohort = $DB->get_record('cohort', array('id' => $cohortid), '*', MUST_EXIST);
$cohortcontext = context::instance_by_id($cohort->contextid);
// The context in the file URL must be either cohort context or context of the course underneath the cohort's context.
if ($context->id != $cohort->contextid &&
($context->contextlevel != CONTEXT_COURSE || !in_array($cohort->contextid, $context->get_parent_context_ids()))) {
send_file_not_found();
}
// User is able to access cohort if they have view cap on cohort level or
// the cohort is visible and they have view cap on course level.
$canview = has_capability('moodle/cohort:view', $cohortcontext) ||
($cohort->visible && has_capability('moodle/cohort:view', $context));
if ($filearea === 'description' && $canview) {
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (($file = $fs->get_file($cohortcontext->id, 'cohort', 'description', $cohort->id, $filepath, $filename))
&& !$file->is_directory()) {
\core\session\manager::write_close(); // Unlock session during file serving.
send_stored_file($file, 60 * 60, 0, $forcedownload, $sendfileoptions);
}
}
send_file_not_found();
} else if ($component === 'group') {
if ($context->contextlevel != CONTEXT_COURSE) {
send_file_not_found();
}
require_course_login($course, true, null, false);
$groupid = (int)array_shift($args);
$group = $DB->get_record('groups', array('id'=>$groupid, 'courseid'=>$course->id), '*', MUST_EXIST);
if (($course->groupmodeforce and $course->groupmode == SEPARATEGROUPS) and !has_capability('moodle/site:accessallgroups', $context) and !groups_is_member($group->id, $USER->id)) {
// do not allow access to separate group info if not member or teacher
send_file_not_found();
}
if ($filearea === 'description') {
require_login($course);
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'group', 'description', $group->id, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
\core\session\manager::write_close(); // Unlock session during file serving.
send_stored_file($file, 60*60, 0, $forcedownload, $sendfileoptions);
} else if ($filearea === 'icon') {
$filename = array_pop($args);
if ($filename !== 'f1' and $filename !== 'f2') {
send_file_not_found();
}
if (!$file = $fs->get_file($context->id, 'group', 'icon', $group->id, '/', $filename.'.png')) {
if (!$file = $fs->get_file($context->id, 'group', 'icon', $group->id, '/', $filename.'.jpg')) {
send_file_not_found();
}
}
\core\session\manager::write_close(); // Unlock session during file serving.
send_stored_file($file, 60*60, 0, false, $sendfileoptions);
>
> } else if ($filearea === 'generated') {
} else {
> if ($CFG->forcelogin) {
send_file_not_found();
> require_login($course);
}
> } else if ($course->id != SITEID) {
> require_login($course);
} else if ($component === 'grouping') {
> }
if ($context->contextlevel != CONTEXT_COURSE) {
>
send_file_not_found();
> $svg = $OUTPUT->get_generated_svg_for_id($group->id);
}
>
> \core\session\manager::write_close(); // Unlock session during file serving.
require_login($course);
> send_file($svg, 'group.svg', 60 * 60, 0, true, $forcedownload);
$groupingid = (int)array_shift($args);
// note: everybody has access to grouping desc images for now
if ($filearea === 'description') {
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'grouping', 'description', $groupingid, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
\core\session\manager::write_close(); // Unlock session during file serving.
send_stored_file($file, 60*60, 0, $forcedownload, $sendfileoptions);
} else {
send_file_not_found();
}
// ========================================================================================================================
} else if ($component === 'backup') {
if ($filearea === 'course' and $context->contextlevel == CONTEXT_COURSE) {
require_login($course);
require_capability('moodle/backup:downloadfile', $context);
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'backup', 'course', 0, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
\core\session\manager::write_close(); // Unlock session during file serving.
send_stored_file($file, 0, 0, $forcedownload, $sendfileoptions);
} else if ($filearea === 'section' and $context->contextlevel == CONTEXT_COURSE) {
require_login($course);
require_capability('moodle/backup:downloadfile', $context);
$sectionid = (int)array_shift($args);
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'backup', 'section', $sectionid, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
\core\session\manager::write_close();
send_stored_file($file, 60*60, 0, $forcedownload, $sendfileoptions);
} else if ($filearea === 'activity' and $context->contextlevel == CONTEXT_MODULE) {
require_login($course, false, $cm);
require_capability('moodle/backup:downloadfile', $context);
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'backup', 'activity', 0, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
\core\session\manager::write_close();
send_stored_file($file, 60*60, 0, $forcedownload, $sendfileoptions);
} else if ($filearea === 'automated' and $context->contextlevel == CONTEXT_COURSE) {
// Backup files that were generated by the automated backup systems.
require_login($course);
require_capability('moodle/backup:downloadfile', $context);
require_capability('moodle/restore:userinfo', $context);
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'backup', 'automated', 0, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
\core\session\manager::write_close(); // Unlock session during file serving.
send_stored_file($file, 0, 0, $forcedownload, $sendfileoptions);
} else {
send_file_not_found();
}
// ========================================================================================================================
} else if ($component === 'question') {
require_once($CFG->libdir . '/questionlib.php');
question_pluginfile($course, $context, 'question', $filearea, $args, $forcedownload, $sendfileoptions);
send_file_not_found();
// ========================================================================================================================
} else if ($component === 'grading') {
if ($filearea === 'description') {
// files embedded into the form definition description
if ($context->contextlevel == CONTEXT_SYSTEM) {
require_login();
} else if ($context->contextlevel >= CONTEXT_COURSE) {
require_login($course, false, $cm);
} else {
send_file_not_found();
}
$formid = (int)array_shift($args);
$sql = "SELECT ga.id
FROM {grading_areas} ga
JOIN {grading_definitions} gd ON (gd.areaid = ga.id)
WHERE gd.id = ? AND ga.contextid = ?";
$areaid = $DB->get_field_sql($sql, array($formid, $context->id), IGNORE_MISSING);
if (!$areaid) {
send_file_not_found();
}
$fullpath = "/$context->id/$component/$filearea/$formid/".implode('/', $args);
if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
send_file_not_found();
}
\core\session\manager::write_close(); // Unlock session during file serving.
send_stored_file($file, 60*60, 0, $forcedownload, $sendfileoptions);
}
} else if ($component === 'contentbank') {
if ($filearea != 'public' || isguestuser()) {
send_file_not_found();
}
if ($context->contextlevel == CONTEXT_SYSTEM || $context->contextlevel == CONTEXT_COURSECAT) {
require_login();
} else if ($context->contextlevel == CONTEXT_COURSE) {
require_login($course);
} else {
send_file_not_found();
}
$componentargs = fullclone($args);
$itemid = (int)array_shift($args);
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
\core\session\manager::write_close(); // Unlock session during file serving.
$contenttype = $DB->get_field('contentbank_content', 'contenttype', ['id' => $itemid]);
if (component_class_callback("\\{$contenttype}\\contenttype", 'pluginfile',
[$course, null, $context, $filearea, $componentargs, $forcedownload, $sendfileoptions], false) === false) {
if (!$file = $fs->get_file($context->id, $component, $filearea, $itemid, $filepath, $filename) or
$file->is_directory()) {
send_file_not_found();
} else {
send_stored_file($file, 0, 0, true, $sendfileoptions); // Must force download - security!
}
}
} else if (strpos($component, 'mod_') === 0) {
$modname = substr($component, 4);
if (!file_exists("$CFG->dirroot/mod/$modname/lib.php")) {
send_file_not_found();
}
require_once("$CFG->dirroot/mod/$modname/lib.php");
if ($context->contextlevel == CONTEXT_MODULE) {
if ($cm->modname !== $modname) {
// somebody tries to gain illegal access, cm type must match the component!
send_file_not_found();
}
}
if ($filearea === 'intro') {
if (!plugin_supports('mod', $modname, FEATURE_MOD_INTRO, true)) {
send_file_not_found();
}
// Require login to the course first (without login to the module).
require_course_login($course, true);
// Now check if module is available OR it is restricted but the intro is shown on the course page.
$cminfo = cm_info::create($cm);
if (!$cminfo->uservisible) {
if (!$cm->showdescription || !$cminfo->is_visible_on_course_page()) {
// Module intro is not visible on the course page and module is not available, show access error.
require_course_login($course, true, $cminfo);
}
}
// all users may access it
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'mod_'.$modname, 'intro', 0, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
// finally send the file
send_stored_file($file, null, 0, false, $sendfileoptions);
}
$filefunction = $component.'_pluginfile';
$filefunctionold = $modname.'_pluginfile';
if (function_exists($filefunction)) {
// if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
$filefunction($course, $cm, $context, $filearea, $args, $forcedownload, $sendfileoptions);
} else if (function_exists($filefunctionold)) {
// if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
$filefunctionold($course, $cm, $context, $filearea, $args, $forcedownload, $sendfileoptions);
}
send_file_not_found();
// ========================================================================================================================
} else if (strpos($component, 'block_') === 0) {
$blockname = substr($component, 6);
// note: no more class methods in blocks please, that is ....
if (!file_exists("$CFG->dirroot/blocks/$blockname/lib.php")) {
send_file_not_found();
}
require_once("$CFG->dirroot/blocks/$blockname/lib.php");
if ($context->contextlevel == CONTEXT_BLOCK) {
$birecord = $DB->get_record('block_instances', array('id'=>$context->instanceid), '*',MUST_EXIST);
if ($birecord->blockname !== $blockname) {
// somebody tries to gain illegal access, cm type must match the component!
send_file_not_found();
}
if ($context->get_course_context(false)) {
// If block is in course context, then check if user has capability to access course.
require_course_login($course);
} else if ($CFG->forcelogin) {
// If user is logged out, bp record will not be visible, even if the user would have access if logged in.
require_login();
}
$bprecord = $DB->get_record('block_positions', array('contextid' => $context->id, 'blockinstanceid' => $context->instanceid));
// User can't access file, if block is hidden or doesn't have block:view capability
if (($bprecord && !$bprecord->visible) || !has_capability('moodle/block:view', $context)) {
send_file_not_found();
}
} else {
$birecord = null;
}
$filefunction = $component.'_pluginfile';
if (function_exists($filefunction)) {
// if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
$filefunction($course, $birecord, $context, $filearea, $args, $forcedownload, $sendfileoptions);
}
send_file_not_found();
// ========================================================================================================================
} else if (strpos($component, '_') === false) {
// all core subsystems have to be specified above, no more guessing here!
send_file_not_found();
} else {
// try to serve general plugin file in arbitrary context
$dir = core_component::get_component_directory($component);
if (!file_exists("$dir/lib.php")) {
send_file_not_found();
}
include_once("$dir/lib.php");
$filefunction = $component.'_pluginfile';
if (function_exists($filefunction)) {
// if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
$filefunction($course, $cm, $context, $filearea, $args, $forcedownload, $sendfileoptions);
}
send_file_not_found();
}
}
