<?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/>.

/**
 * This file contains the version information for the comments feedback plugin
 *
 * @package assignfeedback_editpdf
 * @copyright  2012 Davo Smith
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();


> global $CFG;
/**
> require_once($CFG->dirroot . '/mod/assign/locallib.php');
 * Serves assignment feedback and other files.
> 


 *
 * @param mixed $course course or id of the course
 * @param mixed $cm course module or id of the course module
 * @param context $context
 * @param string $filearea
 * @param array $args
 * @param bool $forcedownload
 * @param array $options - List of options affecting file serving.
 * @return bool false if file not found, does not return if found - just send the file
 */

< function assignfeedback_editpdf_pluginfile($course,



> function assignfeedback_editpdf_pluginfile(
>     $course,


                                           $cm,
                                           context $context,
                                           $filearea,
                                           $args,
                                           $forcedownload,

<                                            array $options=array()) {
<     global $USER, $DB, $CFG;



>     array $options = array()
> ) {
>     global $DB;
>     if ($filearea === 'systemstamps') {




<     require_once($CFG->dirroot . '/mod/assign/locallib.php');



>         if ($context->contextlevel !== CONTEXT_SYSTEM) {
>             return false;
>         }
> 
>         $filename = array_pop($args);
>         $filepath = '/' . implode('/', $args) . '/';
> 
>         $fs = get_file_storage();
>         $file = $fs->get_file($context->id, 'assignfeedback_editpdf', $filearea, 0, $filepath, $filename);
>         if (!$file) {
>             return false;
>         }
> 
>         $options['cacheability'] = 'public';
>         $options['immutable'] = true;
> 
>         send_stored_file($file, null, 0, false, $options);
>     }



    if ($context->contextlevel == CONTEXT_MODULE) {

        require_login($course, false, $cm);
        $itemid = (int)array_shift($args);

        $assign = new assign($context, $cm, $course);

        $record = $DB->get_record('assign_grades', array('id' => $itemid), 'userid,assignment', MUST_EXIST);
        $userid = $record->userid;
        if ($assign->get_instance()->id != $record->assignment) {
            return false;
        }

        // Rely on mod_assign checking permissions.
        if (!$assign->can_view_submission($userid)) {
            return false;
        }

        $relativepath = implode('/', $args);

        $fullpath = "/{$context->id}/assignfeedback_editpdf/$filearea/$itemid/$relativepath";

        $fs = get_file_storage();
        if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
            return false;
        }
        // Download MUST be forced - security!
        send_stored_file($file, 0, 0, true, $options);// Check if we want to retrieve the stamps.
    }

}