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See Release Notes
Long Term Support Release

  • Bug fixes for general core bugs in 4.1.x will end 13 November 2023 (12 months).
  • Bug fixes for security issues in 4.1.x will end 10 November 2025 (36 months).
  • PHP version: minimum PHP 7.4.0 Note: minimum PHP version has increased since Moodle 4.0. PHP 8.0.x is supported too.

Differences Between: [Versions 401 and 402] [Versions 401 and 403]

   1  <?php
   2  
   3  // This file is part of Moodle - http://moodle.org/
   4  //
   5  // Moodle is free software: you can redistribute it and/or modify
   6  // it under the terms of the GNU General Public License as published by
   7  // the Free Software Foundation, either version 3 of the License, or
   8  // (at your option) any later version.
   9  //
  10  // Moodle is distributed in the hope that it will be useful,
  11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  // GNU General Public License for more details.
  14  //
  15  // You should have received a copy of the GNU General Public License
  16  // along with Moodle. If not, see <http://www.gnu.org/licenses/>.
  17  
  18  /**
  19   * This contains functions and classes that will be used by scripts in wiki module
  20   *
  21   * @package mod_wiki
  22   * @copyright 2009 Marc Alier, Jordi Piguillem marc.alier@upc.edu
  23   * @copyright 2009 Universitat Politecnica de Catalunya http://www.upc.edu
  24   *
  25   * @author Jordi Piguillem
  26   * @author Marc Alier
  27   * @author David Jimenez
  28   * @author Josep Arus
  29   * @author Daniel Serrano
  30   * @author Kenneth Riba
  31   *
  32   * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  33   */
  34  
  35  defined('MOODLE_INTERNAL') || die();
  36  
  37  require_once($CFG->dirroot . '/mod/wiki/lib.php');
  38  require_once($CFG->dirroot . '/mod/wiki/parser/parser.php');
  39  require_once($CFG->libdir . '/filelib.php');
  40  
  41  define('WIKI_REFRESH_CACHE_TIME', 30); // @TODO: To be deleted.
  42  define('FORMAT_CREOLE', '37');
  43  define('FORMAT_NWIKI', '38');
  44  define('NO_VALID_RATE', '-999');
  45  define('IMPROVEMENT', '+');
  46  define('EQUAL', '=');
  47  define('WORST', '-');
  48  
  49  define('LOCK_TIMEOUT', 30);
  50  
  51  /**
  52   * Get a wiki instance
  53   * @param int $wikiid the instance id of wiki
  54   */
  55  function wiki_get_wiki($wikiid) {
  56      global $DB;
  57  
  58      return $DB->get_record('wiki', array('id' => $wikiid));
  59  }
  60  
  61  /**
  62   * Get sub wiki instances with same wiki id
  63   * @param int $wikiid
  64   */
  65  function wiki_get_subwikis($wikiid) {
  66      global $DB;
  67      return $DB->get_records('wiki_subwikis', array('wikiid' => $wikiid));
  68  }
  69  
  70  /**
  71   * Get a sub wiki instance by wiki id and group id
  72   * @param int $wikiid
  73   * @param int $groupid
  74   * @return object
  75   */
  76  function wiki_get_subwiki_by_group($wikiid, $groupid, $userid = 0) {
  77      global $DB;
  78      return $DB->get_record('wiki_subwikis', array('wikiid' => $wikiid, 'groupid' => $groupid, 'userid' => $userid));
  79  }
  80  
  81  /**
  82   * Get a sub wiki instace by instance id
  83   * @param int $subwikiid
  84   * @return object
  85   */
  86  function wiki_get_subwiki($subwikiid) {
  87      global $DB;
  88      return $DB->get_record('wiki_subwikis', array('id' => $subwikiid));
  89  
  90  }
  91  
  92  /**
  93   * Add a new sub wiki instance
  94   * @param int $wikiid
  95   * @param int $groupid
  96   * @return int $insertid
  97   */
  98  function wiki_add_subwiki($wikiid, $groupid, $userid = 0) {
  99      global $DB;
 100  
 101      $record = new StdClass();
 102      $record->wikiid = $wikiid;
 103      $record->groupid = $groupid;
 104      $record->userid = $userid;
 105  
 106      $insertid = $DB->insert_record('wiki_subwikis', $record);
 107      return $insertid;
 108  }
 109  
 110  /**
 111   * Get a wiki instance by pageid
 112   * @param int $pageid
 113   * @return object
 114   */
 115  function wiki_get_wiki_from_pageid($pageid) {
 116      global $DB;
 117  
 118      $sql = "SELECT w.*
 119              FROM {wiki} w, {wiki_subwikis} s, {wiki_pages} p
 120              WHERE p.id = ? AND
 121              p.subwikiid = s.id AND
 122              s.wikiid = w.id";
 123  
 124      return $DB->get_record_sql($sql, array($pageid));
 125  }
 126  
 127  /**
 128   * Get a wiki page by pageid
 129   * @param int $pageid
 130   * @return object
 131   */
 132  function wiki_get_page($pageid) {
 133      global $DB;
 134      return $DB->get_record('wiki_pages', array('id' => $pageid));
 135  }
 136  
 137  /**
 138   * Get latest version of wiki page
 139   * @param int $pageid
 140   * @return object
 141   */
 142  function wiki_get_current_version($pageid) {
 143      global $DB;
 144  
 145      // @TODO: Fix this query
 146      $sql = "SELECT *
 147              FROM {wiki_versions}
 148              WHERE pageid = ?
 149              ORDER BY version DESC";
 150      $records = $DB->get_records_sql($sql, array($pageid), 0, 1);
 151      return array_pop($records);
 152  
 153  }
 154  
 155  /**
 156   * Alias of wiki_get_current_version
 157   * @TODO, does the exactly same thing as wiki_get_current_version, should be removed
 158   * @param int $pageid
 159   * @return object
 160   */
 161  function wiki_get_last_version($pageid) {
 162      return wiki_get_current_version($pageid);
 163  }
 164  
 165  /**
 166   * Get page section
 167   * @param int $pageid
 168   * @param string $section
 169   */
 170  function wiki_get_section_page($page, $section) {
 171  
 172      $version = wiki_get_current_version($page->id);
 173      return wiki_parser_proxy::get_section($version->content, $version->contentformat, $section);
 174  }
 175  
 176  /**
 177   * Get a wiki page by page title
 178   * @param int $swid, sub wiki id
 179   * @param string $title
 180   * @return object
 181   */
 182  function wiki_get_page_by_title($swid, $title) {
 183      global $DB;
 184      return $DB->get_record('wiki_pages', array('subwikiid' => $swid, 'title' => $title));
 185  }
 186  
 187  /**
 188   * Get a version record by record id
 189   * @param int $versionid, the version id
 190   * @return object
 191   */
 192  function wiki_get_version($versionid) {
 193      global $DB;
 194      return $DB->get_record('wiki_versions', array('id' => $versionid));
 195  }
 196  
 197  /**
 198   * Get first page of wiki instace
 199   * @param int $subwikiid
 200   * @param int $module, wiki instance object
 201   */
 202  function wiki_get_first_page($subwikid, $module = null) {
 203      global $DB, $USER;
 204  
 205      $sql = "SELECT p.*
 206              FROM {wiki} w, {wiki_subwikis} s, {wiki_pages} p
 207              WHERE s.id = ? AND
 208              s.wikiid = w.id AND
 209              w.firstpagetitle = p.title AND
 210              p.subwikiid = s.id";
 211      return $DB->get_record_sql($sql, array($subwikid));
 212  }
 213  
 214  function wiki_save_section($wikipage, $sectiontitle, $sectioncontent, $userid) {
 215  
 216      $wiki = wiki_get_wiki_from_pageid($wikipage->id);
 217      $cm = get_coursemodule_from_instance('wiki', $wiki->id);
 218      $context = context_module::instance($cm->id);
 219  
 220      if (has_capability('mod/wiki:editpage', $context)) {
 221          $version = wiki_get_current_version($wikipage->id);
 222          $content = wiki_parser_proxy::get_section($version->content, $version->contentformat, $sectiontitle, true);
 223  
 224          $newcontent = $content[0] . $sectioncontent . $content[2];
 225  
 226          return wiki_save_page($wikipage, $newcontent, $userid);
 227      } else {
 228          return false;
 229      }
 230  }
 231  
 232  /**
 233   * Save page content
 234   * @param object $wikipage
 235   * @param string $newcontent
 236   * @param int $userid
 237   */
 238  function wiki_save_page($wikipage, $newcontent, $userid) {
 239      global $DB;
 240  
 241      $wiki = wiki_get_wiki_from_pageid($wikipage->id);
 242      $cm = get_coursemodule_from_instance('wiki', $wiki->id);
 243      $context = context_module::instance($cm->id);
 244  
 245      if (has_capability('mod/wiki:editpage', $context)) {
 246          $version = wiki_get_current_version($wikipage->id);
 247  
 248          $version->content = $newcontent;
 249          $version->userid = $userid;
 250          $version->version++;
 251          $version->timecreated = time();
 252          $version->id = $DB->insert_record('wiki_versions', $version);
 253  
 254          $wikipage->timemodified = $version->timecreated;
 255          $wikipage->userid = $userid;
 256          $return = wiki_refresh_cachedcontent($wikipage, $newcontent);
 257          $event = \mod_wiki\event\page_updated::create(
 258                  array(
 259                      'context' => $context,
 260                      'objectid' => $wikipage->id,
 261                      'relateduserid' => $userid,
 262                      'other' => array(
 263                          'newcontent' => $newcontent
 264                          )
 265                      ));
 266          $event->add_record_snapshot('wiki', $wiki);
 267          $event->add_record_snapshot('wiki_pages', $wikipage);
 268          $event->add_record_snapshot('wiki_versions', $version);
 269          $event->trigger();
 270          return $return;
 271      } else {
 272          return false;
 273      }
 274  }
 275  
 276  function wiki_refresh_cachedcontent($page, $newcontent = null) {
 277      global $DB;
 278  
 279      $version = wiki_get_current_version($page->id);
 280      if (empty($version)) {
 281          return null;
 282      }
 283      if (!isset($newcontent)) {
 284          $newcontent = $version->content;
 285      }
 286  
 287      $options = array('swid' => $page->subwikiid, 'pageid' => $page->id);
 288      $parseroutput = wiki_parse_content($version->contentformat, $newcontent, $options);
 289      $page->cachedcontent = $parseroutput['toc'] . $parseroutput['parsed_text'];
 290      $page->timerendered = time();
 291      $DB->update_record('wiki_pages', $page);
 292  
 293      wiki_refresh_page_links($page, $parseroutput['link_count']);
 294  
 295      return array('page' => $page, 'sections' => $parseroutput['repeated_sections'], 'version' => $version->version);
 296  }
 297  
 298  /**
 299   * Restore a page with specified version.
 300   *
 301   * @param stdClass $wikipage wiki page record
 302   * @param stdClass $version wiki page version to restore
 303   * @param context_module $context context of wiki module
 304   * @return stdClass restored page
 305   */
 306  function wiki_restore_page($wikipage, $version, $context) {
 307      $return = wiki_save_page($wikipage, $version->content, $version->userid);
 308      $event = \mod_wiki\event\page_version_restored::create(
 309              array(
 310                  'context' => $context,
 311                  'objectid' => $version->id,
 312                  'other' => array(
 313                      'pageid' => $wikipage->id
 314                      )
 315                  ));
 316      $event->add_record_snapshot('wiki_versions', $version);
 317      $event->trigger();
 318      return $return['page'];
 319  }
 320  
 321  function wiki_refresh_page_links($page, $links) {
 322      global $DB;
 323  
 324      $DB->delete_records('wiki_links', array('frompageid' => $page->id));
 325      foreach ($links as $linkname => $linkinfo) {
 326  
 327          $newlink = new stdClass();
 328          $newlink->subwikiid = $page->subwikiid;
 329          $newlink->frompageid = $page->id;
 330  
 331          if ($linkinfo['new']) {
 332              $newlink->tomissingpage = $linkname;
 333          } else {
 334              $newlink->topageid = $linkinfo['pageid'];
 335          }
 336  
 337          try {
 338              $DB->insert_record('wiki_links', $newlink);
 339          } catch (dml_exception $e) {
 340              debugging($e->getMessage());
 341          }
 342  
 343      }
 344  }
 345  
 346  /**
 347   * Create a new wiki page, if the page exists, return existing pageid
 348   * @param int $swid
 349   * @param string $title
 350   * @param string $format
 351   * @param int $userid
 352   */
 353  function wiki_create_page($swid, $title, $format, $userid) {
 354      global $DB;
 355      $subwiki = wiki_get_subwiki($swid);
 356      $cm = get_coursemodule_from_instance('wiki', $subwiki->wikiid);
 357      $context = context_module::instance($cm->id);
 358      require_capability('mod/wiki:editpage', $context);
 359      // if page exists
 360      if ($page = wiki_get_page_by_title($swid, $title)) {
 361          return $page->id;
 362      }
 363  
 364      // Creating a new empty version
 365      $version = new stdClass();
 366      $version->content = '';
 367      $version->contentformat = $format;
 368      $version->version = 0;
 369      $version->timecreated = time();
 370      $version->userid = $userid;
 371  
 372      $versionid = null;
 373      $versionid = $DB->insert_record('wiki_versions', $version);
 374  
 375      // Createing a new empty page
 376      $page = new stdClass();
 377      $page->subwikiid = $swid;
 378      $page->title = $title;
 379      $page->cachedcontent = '';
 380      $page->timecreated = $version->timecreated;
 381      $page->timemodified = $version->timecreated;
 382      $page->timerendered = $version->timecreated;
 383      $page->userid = $userid;
 384      $page->pageviews = 0;
 385      $page->readonly = 0;
 386  
 387      $pageid = $DB->insert_record('wiki_pages', $page);
 388  
 389      // Setting the pageid
 390      $version->id = $versionid;
 391      $version->pageid = $pageid;
 392      $DB->update_record('wiki_versions', $version);
 393  
 394      $event = \mod_wiki\event\page_created::create(
 395              array(
 396                  'context' => $context,
 397                  'objectid' => $pageid
 398                  )
 399              );
 400      $event->trigger();
 401  
 402      wiki_make_cache_expire($page->title);
 403      return $pageid;
 404  }
 405  
 406  function wiki_make_cache_expire($pagename) {
 407      global $DB;
 408  
 409      $sql = "UPDATE {wiki_pages}
 410              SET timerendered = 0
 411              WHERE id IN ( SELECT l.frompageid
 412                  FROM {wiki_links} l
 413                  WHERE l.tomissingpage = ?
 414              )";
 415      $DB->execute ($sql, array($pagename));
 416  }
 417  
 418  /**
 419   * Get a specific version of page
 420   * @param int $pageid
 421   * @param int $version
 422   */
 423  function wiki_get_wiki_page_version($pageid, $version) {
 424      global $DB;
 425      return $DB->get_record('wiki_versions', array('pageid' => $pageid, 'version' => $version));
 426  }
 427  
 428  /**
 429   * Get version list
 430   * @param int $pageid
 431   * @param int $limitfrom
 432   * @param int $limitnum
 433   */
 434  function wiki_get_wiki_page_versions($pageid, $limitfrom, $limitnum) {
 435      global $DB;
 436      return $DB->get_records('wiki_versions', array('pageid' => $pageid), 'version DESC', '*', $limitfrom, $limitnum);
 437  }
 438  
 439  /**
 440   * Count the number of page version
 441   * @param int $pageid
 442   */
 443  function wiki_count_wiki_page_versions($pageid) {
 444      global $DB;
 445      return $DB->count_records('wiki_versions', array('pageid' => $pageid));
 446  }
 447  
 448  /**
 449   * Get linked from page
 450   * @param int $pageid
 451   */
 452  function wiki_get_linked_to_pages($pageid) {
 453      global $DB;
 454      return $DB->get_records('wiki_links', array('frompageid' => $pageid));
 455  }
 456  
 457  /**
 458   * Get linked from page
 459   * @param int $pageid
 460   */
 461  function wiki_get_linked_from_pages($pageid) {
 462      global $DB;
 463      return $DB->get_records('wiki_links', array('topageid' => $pageid));
 464  }
 465  
 466  /**
 467   * Get pages which user have been edited
 468   * @param int $swid
 469   * @param int $userid
 470   */
 471  function wiki_get_contributions($swid, $userid) {
 472      global $DB;
 473  
 474      $sql = "SELECT v.*
 475              FROM {wiki_versions} v, {wiki_pages} p
 476              WHERE p.subwikiid = ? AND
 477              v.pageid = p.id AND
 478              v.userid = ?";
 479  
 480      return $DB->get_records_sql($sql, array($swid, $userid));
 481  }
 482  
 483  /**
 484   * Get missing or empty pages in wiki
 485   * @param int $swid sub wiki id
 486   */
 487  function wiki_get_missing_or_empty_pages($swid) {
 488      global $DB;
 489  
 490      $sql = "SELECT DISTINCT p.title, p.id, p.subwikiid
 491              FROM {wiki} w, {wiki_subwikis} s, {wiki_pages} p
 492              WHERE s.wikiid = w.id and
 493              s.id = ? and
 494              w.firstpagetitle != p.title and
 495              p.subwikiid = ? and
 496              1 =  (SELECT count(*)
 497                  FROM {wiki_versions} v
 498                  WHERE v.pageid = p.id)
 499              UNION
 500              SELECT DISTINCT l.tomissingpage as title, 0 as id, l.subwikiid
 501              FROM {wiki_links} l
 502              WHERE l.subwikiid = ? and
 503              l.topageid = 0";
 504  
 505      return $DB->get_records_sql($sql, array($swid, $swid, $swid));
 506  }
 507  
 508  /**
 509   * Get pages list in wiki
 510   * @param int $swid sub wiki id
 511   * @param string $sort How to sort the pages. By default, title ASC.
 512   */
 513  function wiki_get_page_list($swid, $sort = 'title ASC') {
 514      global $DB;
 515      $records = $DB->get_records('wiki_pages', array('subwikiid' => $swid), $sort);
 516      return $records;
 517  }
 518  
 519  /**
 520   * Return a list of orphaned wikis for one specific subwiki
 521   * @global object
 522   * @param int $swid sub wiki id
 523   */
 524  function wiki_get_orphaned_pages($swid) {
 525      global $DB;
 526  
 527      $sql = "SELECT p.id, p.title
 528              FROM {wiki_pages} p, {wiki} w , {wiki_subwikis} s
 529              WHERE p.subwikiid = ?
 530              AND s.id = ?
 531              AND w.id = s.wikiid
 532              AND p.title != w.firstpagetitle
 533              AND p.id NOT IN (SELECT topageid FROM {wiki_links} WHERE subwikiid = ?)";
 534  
 535      return $DB->get_records_sql($sql, array($swid, $swid, $swid));
 536  }
 537  
 538  /**
 539   * Search wiki title
 540   * @param int $swid sub wiki id
 541   * @param string $search
 542   */
 543  function wiki_search_title($swid, $search) {
 544      global $DB;
 545  
 546      return $DB->get_records_select('wiki_pages', "subwikiid = ? AND title LIKE ?", array($swid, '%'.$search.'%'));
 547  }
 548  
 549  /**
 550   * Search wiki content
 551   * @param int $swid sub wiki id
 552   * @param string $search
 553   */
 554  function wiki_search_content($swid, $search) {
 555      global $DB;
 556  
 557      return $DB->get_records_select('wiki_pages', "subwikiid = ? AND cachedcontent LIKE ?", array($swid, '%'.$search.'%'));
 558  }
 559  
 560  /**
 561   * Search wiki title and content
 562   * @param int $swid sub wiki id
 563   * @param string $search
 564   */
 565  function wiki_search_all($swid, $search) {
 566      global $DB;
 567  
 568      return $DB->get_records_select('wiki_pages', "subwikiid = ? AND (cachedcontent LIKE ? OR title LIKE ?)", array($swid, '%'.$search.'%', '%'.$search.'%'));
 569  }
 570  
 571  /**
 572   * Get user data
 573   */
 574  function wiki_get_user_info($userid) {
 575      global $DB;
 576      return $DB->get_record('user', array('id' => $userid));
 577  }
 578  
 579  /**
 580   * Increase page view nubmer
 581   * @param int $page, database record
 582   */
 583  function wiki_increment_pageviews($page) {
 584      global $DB;
 585  
 586      $page->pageviews++;
 587      $DB->update_record('wiki_pages', $page);
 588  }
 589  
 590  //----------------------------------------------------------
 591  //----------------------------------------------------------
 592  
 593  /**
 594   * Text format supported by wiki module
 595   */
 596  function wiki_get_formats() {
 597      return array('html', 'creole', 'nwiki');
 598  }
 599  
 600  /**
 601   * Parses a string with the wiki markup language in $markup.
 602   *
 603   * @return Array or false when something wrong has happened.
 604   *
 605   * Returned array contains the following fields:
 606   *     'parsed_text' => String. Contains the parsed wiki content.
 607   *     'unparsed_text' => String. Constains the original wiki content.
 608   *     'link_count' => Array of array('destination' => ..., 'new' => "is new?"). Contains the internal wiki links found in the wiki content.
 609   *      'deleted_sections' => the list of deleted sections.
 610   *              '' =>
 611   *
 612   * @author Josep Arús Pous
 613   **/
 614  function wiki_parse_content($markup, $pagecontent, $options = array()) {
 615      global $PAGE;
 616  
 617      $subwiki = wiki_get_subwiki($options['swid']);
 618      $cm = get_coursemodule_from_instance("wiki", $subwiki->wikiid);
 619      $context = context_module::instance($cm->id);
 620  
 621      $parser_options = array(
 622          'link_callback' => '/mod/wiki/locallib.php:wiki_parser_link',
 623          'link_callback_args' => array('swid' => $options['swid']),
 624          'table_callback' => '/mod/wiki/locallib.php:wiki_parser_table',
 625          'real_path_callback' => '/mod/wiki/locallib.php:wiki_parser_real_path',
 626          'real_path_callback_args' => array(
 627              'context' => $context,
 628              'component' => 'mod_wiki',
 629              'filearea' => 'attachments',
 630              'subwikiid'=> $subwiki->id,
 631              'pageid' => $options['pageid']
 632          ),
 633          'pageid' => $options['pageid'],
 634          'pretty_print' => (isset($options['pretty_print']) && $options['pretty_print']),
 635          'printable' => (isset($options['printable']) && $options['printable'])
 636      );
 637  
 638      return wiki_parser_proxy::parse($pagecontent, $markup, $parser_options);
 639  }
 640  
 641  /**
 642   * This function is the parser callback to parse wiki links.
 643   *
 644   * It returns the necesary information to print a link.
 645   *
 646   * NOTE: Empty pages and non-existent pages must be print in red color.
 647   *
 648   * !!!!!! IMPORTANT !!!!!!
 649   * It is critical that you call format_string on the content before it is used.
 650   *
 651   * @param string|page_wiki $link name of a page
 652   * @param array $options
 653   * @return array Array('content' => string, 'url' => string, 'new' => bool, 'link_info' => array)
 654   *
 655   * @TODO Doc return and options
 656   */
 657  function wiki_parser_link($link, $options = null) {
 658      global $CFG;
 659  
 660      if (is_object($link)) {
 661          $parsedlink = array('content' => $link->title, 'url' => $CFG->wwwroot . '/mod/wiki/view.php?pageid=' . $link->id, 'new' => false, 'link_info' => array('link' => $link->title, 'pageid' => $link->id, 'new' => false));
 662  
 663          $version = wiki_get_current_version($link->id);
 664          if ($version->version == 0) {
 665              $parsedlink['new'] = true;
 666          }
 667          return $parsedlink;
 668      } else {
 669          $swid = $options['swid'];
 670  
 671          if ($page = wiki_get_page_by_title($swid, $link)) {
 672              $parsedlink = array('content' => $link, 'url' => $CFG->wwwroot . '/mod/wiki/view.php?pageid=' . $page->id, 'new' => false, 'link_info' => array('link' => $link, 'pageid' => $page->id, 'new' => false));
 673  
 674              $version = wiki_get_current_version($page->id);
 675              if ($version->version == 0) {
 676                  $parsedlink['new'] = true;
 677              }
 678  
 679              return $parsedlink;
 680  
 681          } else {
 682              return array('content' => $link, 'url' => $CFG->wwwroot . '/mod/wiki/create.php?swid=' . $swid . '&amp;title=' . urlencode($link) . '&amp;action=new', 'new' => true, 'link_info' => array('link' => $link, 'new' => true, 'pageid' => 0));
 683          }
 684      }
 685  }
 686  
 687  /**
 688   * Returns the table fully parsed (HTML)
 689   *
 690   * @return HTML for the table $table
 691   * @author Josep Arús Pous
 692   *
 693   **/
 694  function wiki_parser_table($table) {
 695      global $OUTPUT;
 696  
 697      $htmltable = new html_table();
 698  
 699      $headers = $table[0];
 700      $htmltable->head = array();
 701      foreach ($headers as $h) {
 702          $htmltable->head[] = $h[1];
 703      }
 704  
 705      array_shift($table);
 706      $htmltable->data = array();
 707      foreach ($table as $row) {
 708          $row_data = array();
 709          foreach ($row as $r) {
 710              $row_data[] = $r[1];
 711          }
 712          $htmltable->data[] = $row_data;
 713      }
 714  
 715      return html_writer::table($htmltable);
 716  }
 717  
 718  /**
 719   * Returns an absolute path link, unless there is no such link.
 720   *
 721   * @param string $url Link's URL or filename
 722   * @param stdClass $context filearea params
 723   * @param string $component The component the file is associated with
 724   * @param string $filearea The filearea the file is stored in
 725   * @param int $swid Sub wiki id
 726   *
 727   * @return string URL for files full path
 728   */
 729  
 730  function wiki_parser_real_path($url, $context, $component, $filearea, $swid) {
 731      global $CFG;
 732  
 733      if (preg_match("/^(?:http|ftp)s?\:\/\//", $url)) {
 734          return $url;
 735      } else {
 736  
 737          $file = 'pluginfile.php';
 738          if (!$CFG->slasharguments) {
 739              $file = $file . '?file=';
 740          }
 741          $baseurl = "$CFG->wwwroot/$file/{$context->id}/$component/$filearea/$swid/";
 742          // it is a file in current file area
 743          return $baseurl . $url;
 744      }
 745  }
 746  
 747  /**
 748   * Returns the token used by a wiki language to represent a given tag or "object" (bold -> **)
 749   *
 750   * @return A string when it has only one token at the beginning (f. ex. lists). An array composed by 2 strings when it has 2 tokens, one at the beginning and one at the end (f. ex. italics). Returns false otherwise.
 751   * @author Josep Arús Pous
 752   **/
 753  function wiki_parser_get_token($markup, $name) {
 754  
 755      return wiki_parser_proxy::get_token($name, $markup);
 756  }
 757  
 758  /**
 759   * Checks if current user can view a subwiki
 760   *
 761   * @param stdClass $subwiki usually record from {wiki_subwikis}. Must contain fields 'wikiid', 'groupid', 'userid'.
 762   *     If it also contains fields 'course' and 'groupmode' from table {wiki} it will save extra DB query.
 763   * @param stdClass $wiki optional wiki object if known
 764   * @return bool
 765   */
 766  function wiki_user_can_view($subwiki, $wiki = null) {
 767      global $USER;
 768  
 769      if (empty($wiki) || $wiki->id != $subwiki->wikiid) {
 770          $wiki = wiki_get_wiki($subwiki->wikiid);
 771      }
 772      $modinfo = get_fast_modinfo($wiki->course);
 773      if (!isset($modinfo->instances['wiki'][$subwiki->wikiid])) {
 774          // Module does not exist.
 775          return false;
 776      }
 777      $cm = $modinfo->instances['wiki'][$subwiki->wikiid];
 778      if (!$cm->uservisible) {
 779          // The whole module is not visible to the current user.
 780          return false;
 781      }
 782      $context = context_module::instance($cm->id);
 783  
 784      // Working depending on activity groupmode
 785      switch (groups_get_activity_groupmode($cm)) {
 786      case NOGROUPS:
 787  
 788          if ($wiki->wikimode == 'collaborative') {
 789              // Collaborative Mode:
 790              // There is one wiki for all the class.
 791              //
 792              // Only view capbility needed
 793              return has_capability('mod/wiki:viewpage', $context);
 794          } else if ($wiki->wikimode == 'individual') {
 795              // Individual Mode:
 796              // Each person owns a wiki.
 797              if ($subwiki->userid == $USER->id) {
 798                  // Only the owner of the wiki can view it
 799                  return has_capability('mod/wiki:viewpage', $context);
 800              } else { // User has special capabilities
 801                  // User must have:
 802                  //      mod/wiki:viewpage capability
 803                  // and
 804                  //      mod/wiki:managewiki capability
 805                  $view = has_capability('mod/wiki:viewpage', $context);
 806                  $manage = has_capability('mod/wiki:managewiki', $context);
 807  
 808                  return $view && $manage;
 809              }
 810          } else {
 811              //Error
 812              return false;
 813          }
 814      case SEPARATEGROUPS:
 815          // Collaborative and Individual Mode
 816          //
 817          // Collaborative Mode:
 818          //      There is one wiki per group.
 819          // Individual Mode:
 820          //      Each person owns a wiki.
 821          if ($wiki->wikimode == 'collaborative' || $wiki->wikimode == 'individual') {
 822              // Only members of subwiki group could view that wiki
 823              if (in_array($subwiki->groupid, $modinfo->get_groups($cm->groupingid))) {
 824                  // Only view capability needed
 825                  return has_capability('mod/wiki:viewpage', $context);
 826  
 827              } else { // User is not part of that group
 828                  // User must have:
 829                  //      mod/wiki:managewiki capability
 830                  // or
 831                  //      moodle/site:accessallgroups capability
 832                  // and
 833                  //      mod/wiki:viewpage capability
 834                  $view = has_capability('mod/wiki:viewpage', $context);
 835                  $manage = has_capability('mod/wiki:managewiki', $context);
 836                  $access = has_capability('moodle/site:accessallgroups', $context);
 837                  return ($manage || $access) && $view;
 838              }
 839          } else {
 840              //Error
 841              return false;
 842          }
 843      case VISIBLEGROUPS:
 844          // Collaborative and Individual Mode
 845          //
 846          // Collaborative Mode:
 847          //      There is one wiki per group.
 848          // Individual Mode:
 849          //      Each person owns a wiki.
 850          if ($wiki->wikimode == 'collaborative' || $wiki->wikimode == 'individual') {
 851              // Everybody can read all wikis
 852              //
 853              // Only view capability needed
 854              return has_capability('mod/wiki:viewpage', $context);
 855          } else {
 856              //Error
 857              return false;
 858          }
 859      default: // Error
 860          return false;
 861      }
 862  }
 863  
 864  /**
 865   * Checks if current user can edit a subwiki
 866   *
 867   * @param $subwiki
 868   */
 869  function wiki_user_can_edit($subwiki) {
 870      global $USER;
 871  
 872      $wiki = wiki_get_wiki($subwiki->wikiid);
 873      $cm = get_coursemodule_from_instance('wiki', $wiki->id);
 874      $context = context_module::instance($cm->id);
 875  
 876      // Working depending on activity groupmode
 877      switch (groups_get_activity_groupmode($cm)) {
 878      case NOGROUPS:
 879  
 880          if ($wiki->wikimode == 'collaborative') {
 881              // Collaborative Mode:
 882              // There is a wiki for all the class.
 883              //
 884              // Only edit capbility needed
 885              return has_capability('mod/wiki:editpage', $context);
 886          } else if ($wiki->wikimode == 'individual') {
 887              // Individual Mode
 888              // There is a wiki per user
 889  
 890              // Only the owner of that wiki can edit it
 891              if ($subwiki->userid == $USER->id) {
 892                  return has_capability('mod/wiki:editpage', $context);
 893              } else { // Current user is not the owner of that wiki.
 894  
 895                  // User must have:
 896                  //      mod/wiki:editpage capability
 897                  // and
 898                  //      mod/wiki:managewiki capability
 899                  $edit = has_capability('mod/wiki:editpage', $context);
 900                  $manage = has_capability('mod/wiki:managewiki', $context);
 901  
 902                  return $edit && $manage;
 903              }
 904          } else {
 905              //Error
 906              return false;
 907          }
 908      case SEPARATEGROUPS:
 909          if ($wiki->wikimode == 'collaborative') {
 910              // Collaborative Mode:
 911              // There is one wiki per group.
 912              //
 913              // Only members of subwiki group could edit that wiki
 914              if (groups_is_member($subwiki->groupid)) {
 915                  // Only edit capability needed
 916                  return has_capability('mod/wiki:editpage', $context);
 917              } else { // User is not part of that group
 918                  // User must have:
 919                  //      mod/wiki:managewiki capability
 920                  // and
 921                  //      moodle/site:accessallgroups capability
 922                  // and
 923                  //      mod/wiki:editpage capability
 924                  $manage = has_capability('mod/wiki:managewiki', $context);
 925                  $access = has_capability('moodle/site:accessallgroups', $context);
 926                  $edit = has_capability('mod/wiki:editpage', $context);
 927                  return $manage && $access && $edit;
 928              }
 929          } else if ($wiki->wikimode == 'individual') {
 930              // Individual Mode:
 931              // Each person owns a wiki.
 932              //
 933              // Only the owner of that wiki can edit it
 934              if ($subwiki->userid == $USER->id) {
 935                  return has_capability('mod/wiki:editpage', $context);
 936              } else { // Current user is not the owner of that wiki.
 937                  // User must have:
 938                  //      mod/wiki:managewiki capability
 939                  // and
 940                  //      moodle/site:accessallgroups capability
 941                  // and
 942                  //      mod/wiki:editpage capability
 943                  $manage = has_capability('mod/wiki:managewiki', $context);
 944                  $access = has_capability('moodle/site:accessallgroups', $context);
 945                  $edit = has_capability('mod/wiki:editpage', $context);
 946                  return $manage && $access && $edit;
 947              }
 948          } else {
 949              //Error
 950              return false;
 951          }
 952      case VISIBLEGROUPS:
 953          if ($wiki->wikimode == 'collaborative') {
 954              // Collaborative Mode:
 955              // There is one wiki per group.
 956              //
 957              // Only members of subwiki group could edit that wiki
 958              if (groups_is_member($subwiki->groupid)) {
 959                  // Only edit capability needed
 960                  return has_capability('mod/wiki:editpage', $context);
 961              } else { // User is not part of that group
 962                  // User must have:
 963                  //      mod/wiki:managewiki capability
 964                  // and
 965                  //      mod/wiki:editpage capability
 966                  $manage = has_capability('mod/wiki:managewiki', $context);
 967                  $edit = has_capability('mod/wiki:editpage', $context);
 968                  return $manage && $edit;
 969              }
 970          } else if ($wiki->wikimode == 'individual') {
 971              // Individual Mode:
 972              // Each person owns a wiki.
 973              //
 974              // Only the owner of that wiki can edit it
 975              if ($subwiki->userid == $USER->id) {
 976                  return has_capability('mod/wiki:editpage', $context);
 977              } else { // Current user is not the owner of that wiki.
 978                  // User must have:
 979                  //      mod/wiki:managewiki capability
 980                  // and
 981                  //      mod/wiki:editpage capability
 982                  $manage = has_capability('mod/wiki:managewiki', $context);
 983                  $edit = has_capability('mod/wiki:editpage', $context);
 984                  return $manage && $edit;
 985              }
 986          } else {
 987              //Error
 988              return false;
 989          }
 990      default: // Error
 991          return false;
 992      }
 993  }
 994  
 995  //----------------
 996  // Locks
 997  //----------------
 998  
 999  /**
1000   * Checks if a page-section is locked.
1001   *
1002   * @return true if the combination of section and page is locked, FALSE otherwise.
1003   */
1004  function wiki_is_page_section_locked($pageid, $userid, $section = null) {
1005      global $DB;
1006  
1007      $sql = "pageid = ? AND lockedat > ? AND userid != ?";
1008      $params = array($pageid, time(), $userid);
1009  
1010      if (!empty($section)) {
1011          $sql .= " AND (sectionname = ? OR sectionname IS null)";
1012          $params[] = $section;
1013      }
1014  
1015      return $DB->record_exists_select('wiki_locks', $sql, $params);
1016  }
1017  
1018  /**
1019   * Inserts or updates a wiki_locks record.
1020   */
1021  function wiki_set_lock($pageid, $userid, $section = null, $insert = false) {
1022      global $DB;
1023  
1024      if (wiki_is_page_section_locked($pageid, $userid, $section)) {
1025          return false;
1026      }
1027  
1028      $params = array('pageid' => $pageid, 'userid' => $userid, 'sectionname' => $section);
1029  
1030      $lock = $DB->get_record('wiki_locks', $params);
1031  
1032      if (!empty($lock)) {
1033          $DB->update_record('wiki_locks', array('id' => $lock->id, 'lockedat' => time() + LOCK_TIMEOUT));
1034      } else if ($insert) {
1035          $DB->insert_record('wiki_locks',
1036              array('pageid' => $pageid, 'sectionname' => $section, 'userid' => $userid, 'lockedat' => time() + LOCK_TIMEOUT));
1037      }
1038  
1039      return true;
1040  }
1041  
1042  /**
1043   * Deletes wiki_locks that are not in use. (F.Ex. after submitting the changes). If no userid is present, it deletes ALL the wiki_locks of a specific page.
1044   *
1045   * @param int $pageid page id.
1046   * @param int $userid id of user for which lock is deleted.
1047   * @param string $section section to be deleted.
1048   * @param bool $delete_from_db deleted from db.
1049   * @param bool $delete_section_and_page delete section and page version.
1050   */
1051  function wiki_delete_locks($pageid, $userid = null, $section = null, $delete_from_db = true, $delete_section_and_page = false) {
1052      global $DB;
1053  
1054      $wiki = wiki_get_wiki_from_pageid($pageid);
1055      $cm = get_coursemodule_from_instance('wiki', $wiki->id);
1056      $context = context_module::instance($cm->id);
1057  
1058      $params = array('pageid' => $pageid);
1059  
1060      if (!empty($userid)) {
1061          $params['userid'] = $userid;
1062      }
1063  
1064      if (!empty($section)) {
1065          $params['sectionname'] = $section;
1066      }
1067  
1068      if ($delete_from_db) {
1069          $DB->delete_records('wiki_locks', $params);
1070          if ($delete_section_and_page && !empty($section)) {
1071              $params['sectionname'] = null;
1072              $DB->delete_records('wiki_locks', $params);
1073          }
1074          $event = \mod_wiki\event\page_locks_deleted::create(
1075          array(
1076              'context' => $context,
1077              'objectid' => $pageid,
1078              'relateduserid' => $userid,
1079              'other' => array(
1080                  'section' => $section
1081                  )
1082              ));
1083          // No need to add snapshot, as important data is section, userid and pageid, which is part of event.
1084          $event->trigger();
1085      } else {
1086          $DB->set_field('wiki_locks', 'lockedat', time(), $params);
1087      }
1088  }
1089  
1090  /**
1091   * Deletes wiki_locks that expired 1 hour ago.
1092   */
1093  function wiki_delete_old_locks() {
1094      global $DB;
1095  
1096      $DB->delete_records_select('wiki_locks', "lockedat < ?", array(time() - 3600));
1097  }
1098  
1099  /**
1100   * Deletes wiki_links. It can be sepecific link or links attached in subwiki
1101   *
1102   * @global mixed $DB database object
1103   * @param int $linkid id of the link to be deleted
1104   * @param int $topageid links to the specific page
1105   * @param int $frompageid links from specific page
1106   * @param int $subwikiid links to subwiki
1107   */
1108  function wiki_delete_links($linkid = null, $topageid = null, $frompageid = null, $subwikiid = null) {
1109      global $DB;
1110      $params = array();
1111  
1112      // if link id is givien then don't check for anything else
1113      if (!empty($linkid)) {
1114          $params['id'] = $linkid;
1115      } else {
1116          if (!empty($topageid)) {
1117              $params['topageid'] = $topageid;
1118          }
1119          if (!empty($frompageid)) {
1120              $params['frompageid'] = $frompageid;
1121          }
1122          if (!empty($subwikiid)) {
1123              $params['subwikiid'] = $subwikiid;
1124          }
1125      }
1126  
1127      //Delete links if any params are passed, else nothing to delete.
1128      if (!empty($params)) {
1129          $DB->delete_records('wiki_links', $params);
1130      }
1131  }
1132  
1133  /**
1134   * Delete wiki synonyms related to subwikiid or page
1135   *
1136   * @param int $subwikiid id of sunbwiki
1137   * @param int $pageid id of page
1138   */
1139  function wiki_delete_synonym($subwikiid, $pageid = null) {
1140      global $DB;
1141  
1142      $params = array('subwikiid' => $subwikiid);
1143      if (!is_null($pageid)) {
1144          $params['pageid'] = $pageid;
1145      }
1146      $DB->delete_records('wiki_synonyms', $params, IGNORE_MISSING);
1147  }
1148  
1149  /**
1150   * Delete pages and all related data
1151   *
1152   * @param mixed $context context in which page needs to be deleted.
1153   * @param mixed $pageids id's of pages to be deleted
1154   * @param int $subwikiid id of the subwiki for which all pages should be deleted
1155   */
1156  function wiki_delete_pages($context, $pageids = null, $subwikiid = null) {
1157      global $DB, $CFG;
1158  
1159      if (!empty($pageids) && is_int($pageids)) {
1160         $pageids = array($pageids);
1161      } else if (!empty($subwikiid)) {
1162          $pageids = wiki_get_page_list($subwikiid);
1163      }
1164  
1165      //If there is no pageid then return as we can't delete anything.
1166      if (empty($pageids)) {
1167          return;
1168      }
1169  
1170      /// Delete page and all it's relevent data
1171      foreach ($pageids as $pageid) {
1172          if (is_object($pageid)) {
1173              $pageid = $pageid->id;
1174          }
1175  
1176          //Delete page comments
1177          $comments = wiki_get_comments($context->id, $pageid);
1178          foreach ($comments as $commentid => $commentvalue) {
1179              wiki_delete_comment($commentid, $context, $pageid);
1180          }
1181  
1182          //Delete page tags
1183          core_tag_tag::remove_all_item_tags('mod_wiki', 'wiki_pages', $pageid);
1184  
1185          //Delete Synonym
1186          wiki_delete_synonym($subwikiid, $pageid);
1187  
1188          //Delete all page versions
1189          wiki_delete_page_versions(array($pageid=>array(0)), $context);
1190  
1191          //Delete all page locks
1192          wiki_delete_locks($pageid);
1193  
1194          //Delete all page links
1195          wiki_delete_links(null, $pageid);
1196  
1197          $params = array('id' => $pageid);
1198  
1199          // Get page before deleting.
1200          $page = $DB->get_record('wiki_pages', $params);
1201  
1202          //Delete page
1203          $DB->delete_records('wiki_pages', $params);
1204  
1205          // Trigger page_deleted event.
1206          $event = \mod_wiki\event\page_deleted::create(
1207                  array(
1208                      'context' => $context,
1209                      'objectid' => $pageid,
1210                      'other' => array('subwikiid' => $subwikiid)
1211                      ));
1212          $event->add_record_snapshot('wiki_pages', $page);
1213          $event->trigger();
1214      }
1215  }
1216  
1217  /**
1218   * Delete specificed versions of a page or versions created by users
1219   * if version is 0 then it will remove all versions of the page
1220   *
1221   * @param array $deleteversions delete versions for a page
1222   * @param context_module $context module context
1223   */
1224  function wiki_delete_page_versions($deleteversions, $context = null) {
1225      global $DB;
1226  
1227      /// delete page-versions
1228      foreach ($deleteversions as $id => $versions) {
1229          $params = array('pageid' => $id);
1230          if (is_null($context)) {
1231              $wiki = wiki_get_wiki_from_pageid($id);
1232              $cm = get_coursemodule_from_instance('wiki', $wiki->id);
1233              $context = context_module::instance($cm->id);
1234          }
1235          // Delete all versions, if version specified is 0.
1236          if (in_array(0, $versions)) {
1237              $oldversions = $DB->get_records('wiki_versions', $params);
1238              $DB->delete_records('wiki_versions', $params, IGNORE_MISSING);
1239          } else {
1240              list($insql, $param) = $DB->get_in_or_equal($versions);
1241              $insql .= ' AND pageid = ?';
1242              array_push($param, $params['pageid']);
1243              $oldversions = $DB->get_records_select('wiki_versions', 'version ' . $insql, $param);
1244              $DB->delete_records_select('wiki_versions', 'version ' . $insql, $param);
1245          }
1246          foreach ($oldversions as $version) {
1247              // Trigger page version deleted event.
1248              $event = \mod_wiki\event\page_version_deleted::create(
1249                      array(
1250                          'context' => $context,
1251                          'objectid' => $version->id,
1252                          'other' => array(
1253                              'pageid' => $id
1254                          )
1255                      ));
1256              $event->add_record_snapshot('wiki_versions', $version);
1257              $event->trigger();
1258          }
1259      }
1260  }
1261  
1262  function wiki_get_comment($commentid){
1263      global $DB;
1264      return $DB->get_record('comments', array('id' => $commentid));
1265  }
1266  
1267  /**
1268   * Returns all comments by context and pageid
1269   *
1270   * @param int $contextid Current context id
1271   * @param int $pageid Current pageid
1272   **/
1273  function wiki_get_comments($contextid, $pageid) {
1274      global $DB;
1275  
1276      return $DB->get_records('comments', array('contextid' => $contextid, 'itemid' => $pageid, 'commentarea' => 'wiki_page'), 'timecreated ASC');
1277  }
1278  
1279  /**
1280   * Add comments ro database
1281   *
1282   * @param object $context. Current context
1283   * @param int $pageid. Current pageid
1284   * @param string $content. Content of the comment
1285   * @param string editor. Version of editor we are using.
1286   **/
1287  function wiki_add_comment($context, $pageid, $content, $editor) {
1288      global $CFG;
1289      require_once($CFG->dirroot . '/comment/lib.php');
1290  
1291      list($context, $course, $cm) = get_context_info_array($context->id);
1292      $cmt = new stdclass();
1293      $cmt->context = $context;
1294      $cmt->itemid = $pageid;
1295      $cmt->area = 'wiki_page';
1296      $cmt->course = $course;
1297      $cmt->component = 'mod_wiki';
1298  
1299      $manager = new comment($cmt);
1300  
1301      if ($editor == 'creole') {
1302          $manager->add($content, FORMAT_CREOLE);
1303      } else if ($editor == 'html') {
1304          $manager->add($content, FORMAT_HTML);
1305      } else if ($editor == 'nwiki') {
1306          $manager->add($content, FORMAT_NWIKI);
1307      }
1308  
1309  }
1310  
1311  /**
1312   * Delete comments from database
1313   *
1314   * @param $idcomment. Id of comment which will be deleted
1315   * @param $context. Current context
1316   * @param $pageid. Current pageid
1317   **/
1318  function wiki_delete_comment($idcomment, $context, $pageid) {
1319      global $CFG;
1320      require_once($CFG->dirroot . '/comment/lib.php');
1321  
1322      list($context, $course, $cm) = get_context_info_array($context->id);
1323      $cmt = new stdClass();
1324      $cmt->context = $context;
1325      $cmt->itemid = $pageid;
1326      $cmt->area = 'wiki_page';
1327      $cmt->course = $course;
1328      $cmt->component = 'mod_wiki';
1329  
1330      $manager = new comment($cmt);
1331      $manager->delete($idcomment);
1332  
1333  }
1334  
1335  /**
1336   * Delete al comments from wiki
1337   *
1338   **/
1339  function wiki_delete_comments_wiki() {
1340      global $PAGE, $DB;
1341  
1342      $cm = $PAGE->cm;
1343      $context = context_module::instance($cm->id);
1344  
1345      $table = 'comments';
1346      $select = 'contextid = ?';
1347  
1348      $DB->delete_records_select($table, $select, array($context->id));
1349  
1350  }
1351  
1352  function wiki_add_progress($pageid, $oldversionid, $versionid, $progress) {
1353      global $DB;
1354      for ($v = $oldversionid + 1; $v <= $versionid; $v++) {
1355          $user = wiki_get_wiki_page_id($pageid, $v);
1356  
1357          $DB->insert_record('wiki_progress', array('userid' => $user->userid, 'pageid' => $pageid, 'versionid' => $v, 'progress' => $progress));
1358      }
1359  }
1360  
1361  function wiki_get_wiki_page_id($pageid, $id) {
1362      global $DB;
1363      return $DB->get_record('wiki_versions', array('pageid' => $pageid, 'id' => $id));
1364  }
1365  
1366  function wiki_print_page_content($page, $context, $subwikiid) {
1367      global $OUTPUT, $CFG;
1368  
1369      if ($page->timerendered + WIKI_REFRESH_CACHE_TIME < time()) {
1370          $content = wiki_refresh_cachedcontent($page);
1371          $page = $content['page'];
1372      }
1373  
1374      if (isset($content)) {
1375          $box = '';
1376          foreach ($content['sections'] as $s) {
1377              $box .= '<p>' . get_string('repeatedsection', 'wiki', $s) . '</p>';
1378          }
1379  
1380          if (!empty($box)) {
1381              echo $OUTPUT->box($box);
1382          }
1383      }
1384      $html = file_rewrite_pluginfile_urls($page->cachedcontent, 'pluginfile.php', $context->id, 'mod_wiki', 'attachments', $subwikiid);
1385      $html = format_text($html, FORMAT_HTML, array('overflowdiv' => true, 'allowid' => true));
1386      echo $OUTPUT->box($html);
1387  
1388      echo $OUTPUT->tag_list(core_tag_tag::get_item_tags('mod_wiki', 'wiki_pages', $page->id),
1389              null, 'wiki-tags');
1390  
1391      wiki_increment_pageviews($page);
1392  }
1393  
1394  /**
1395   * This function trims any given text and returns it with some dots at the end
1396   *
1397   * @param string $text
1398   * @param string $limit
1399   *
1400   * @return string
1401   */
1402  function wiki_trim_string($text, $limit = 25) {
1403  
1404      if (core_text::strlen($text) > $limit) {
1405          $text = core_text::substr($text, 0, $limit) . '...';
1406      }
1407  
1408      return $text;
1409  }
1410  
1411  /**
1412   * Prints default edit form fields and buttons
1413   *
1414   * @param string $format Edit form format (html, creole...)
1415   * @param integer $version Version number. A negative number means no versioning.
1416   */
1417  
1418  function wiki_print_edit_form_default_fields($format, $pageid, $version = -1, $upload = false, $deleteuploads = array()) {
1419      global $CFG, $PAGE, $OUTPUT;
1420  
1421      echo '<input type="hidden" name="sesskey" value="' . sesskey() . '" />';
1422  
1423      if ($version >= 0) {
1424          echo '<input type="hidden" name="version" value="' . $version . '" />';
1425      }
1426  
1427      echo '<input type="hidden" name="format" value="' . $format . '"/>';
1428  
1429      //attachments
1430      require_once($CFG->dirroot . '/lib/form/filemanager.php');
1431  
1432      $filemanager = new MoodleQuickForm_filemanager('attachments', get_string('wikiattachments', 'wiki'), array('id' => 'attachments'), array('subdirs' => false, 'maxfiles' => 99, 'maxbytes' => $CFG->maxbytes));
1433  
1434      $value = file_get_submitted_draft_itemid('attachments');
1435      if (!empty($value) && !$upload) {
1436          $filemanager->setValue($value);
1437      }
1438  
1439      echo "<fieldset class=\"wiki-upload-section clearfix\"><legend class=\"ftoggler\">" . get_string("uploadtitle", 'wiki') . "</legend>";
1440  
1441      echo $OUTPUT->container_start('container');
1442      print $filemanager->toHtml();
1443      echo $OUTPUT->container_end();
1444  
1445      $cm = $PAGE->cm;
1446      $context = context_module::instance($cm->id);
1447  
1448      echo $OUTPUT->container_start('container wiki-upload-table');
1449      wiki_print_upload_table($context, 'wiki_upload', $pageid, $deleteuploads);
1450      echo $OUTPUT->container_end();
1451  
1452      echo "</fieldset>";
1453  
1454      echo '<input class="wiki_button btn btn-secondary" type="submit" name="editoption" value="'
1455          . get_string('save', 'wiki') . '" />';
1456      echo '<input class="wiki_button btn btn-secondary" type="submit" name="editoption" value="'
1457          . get_string('upload', 'wiki') . '" />';
1458      echo '<input class="wiki_button btn btn-secondary" type="submit" name="editoption" value="' . get_string('preview') . '" />';
1459      echo '<input class="wiki_button btn btn-secondary" type="submit" name="editoption" value="' . get_string('cancel') . '" />';
1460  }
1461  
1462  /**
1463   * Prints a table with the files attached to a wiki page
1464   * @param object $context
1465   * @param string $filearea
1466   * @param int $fileitemid
1467   * @param array deleteuploads
1468   */
1469  function wiki_print_upload_table($context, $filearea, $fileitemid, $deleteuploads = array()) {
1470      global $CFG, $OUTPUT;
1471  
1472      $htmltable = new html_table();
1473  
1474      $htmltable->head = array(get_string('deleteupload', 'wiki'), get_string('uploadname', 'wiki'), get_string('uploadactions', 'wiki'));
1475  
1476      $fs = get_file_storage();
1477      $files = $fs->get_area_files($context->id, 'mod_wiki', $filearea, $fileitemid); //TODO: this is weird (skodak)
1478  
1479      foreach ($files as $file) {
1480          if (!$file->is_directory()) {
1481              $checkbox = '<input type="checkbox" name="deleteupload[]", value="' . $file->get_pathnamehash() . '"';
1482  
1483              if (in_array($file->get_pathnamehash(), $deleteuploads)) {
1484                  $checkbox .= ' checked="checked"';
1485              }
1486  
1487              $checkbox .= " />";
1488  
1489              $htmltable->data[] = array($checkbox, '<a href="' . file_encode_url($CFG->wwwroot . '/pluginfile.php', '/' . $context->id . '/wiki_upload/' . $fileitemid . '/' . $file->get_filename()) . '">' . $file->get_filename() . '</a>', "");
1490          }
1491      }
1492  
1493      print '<h3 class="upload-table-title">' . get_string('uploadfiletitle', 'wiki') . "</h3>";
1494      print html_writer::table($htmltable);
1495  }
1496  
1497  /**
1498   * Generate wiki's page tree
1499   *
1500   * @param page_wiki $page. A wiki page object
1501   * @param navigation_node $node. Starting navigation_node
1502   * @param array $keys. An array to store keys
1503   * @return an array with all tree nodes
1504   */
1505  function wiki_build_tree($page, $node, &$keys) {
1506      $content = array();
1507      static $icon = null;
1508      if ($icon === null) {
1509          // Substitute the default navigation icon with empty image.
1510          $icon = new pix_icon('spacer', '');
1511      }
1512      $pages = wiki_get_linked_pages($page->id);
1513      foreach ($pages as $p) {
1514          $key = $page->id . ':' . $p->id;
1515          if (in_array($key, $keys)) {
1516              break;
1517          }
1518          array_push($keys, $key);
1519          $l = wiki_parser_link($p);
1520          $link = new moodle_url('/mod/wiki/view.php', array('pageid' => $p->id));
1521          // navigation_node::get_content will format the title for us
1522          $nodeaux = $node->add($p->title, $link, null, null, null, $icon);
1523          if ($l['new']) {
1524              $nodeaux->add_class('wiki_newentry');
1525          }
1526          wiki_build_tree($p, $nodeaux, $keys);
1527      }
1528      $content[] = $node;
1529      return $content;
1530  }
1531  
1532  /**
1533   * Get linked pages from page
1534   * @param int $pageid
1535   */
1536  function wiki_get_linked_pages($pageid) {
1537      global $DB;
1538  
1539      $sql = "SELECT p.id, p.title
1540              FROM {wiki_pages} p
1541              JOIN {wiki_links} l ON l.topageid = p.id
1542              WHERE l.frompageid = ?
1543              ORDER BY p.title ASC";
1544      return $DB->get_records_sql($sql, array($pageid));
1545  }
1546  
1547  /**
1548   * Get updated pages from wiki
1549   * @param int $pageid
1550   */
1551  function wiki_get_updated_pages_by_subwiki($swid) {
1552      global $DB, $USER;
1553  
1554      $sql = "SELECT *
1555              FROM {wiki_pages}
1556              WHERE subwikiid = ? AND timemodified > ?
1557              ORDER BY timemodified DESC";
1558      return $DB->get_records_sql($sql, array($swid, $USER->lastlogin));
1559  }
1560  
1561  /**
1562   * Check if the user can create pages in a certain wiki.
1563   * @param context $context Wiki's context.
1564   * @param integer|stdClass $user A user id or object. By default (null) checks the permissions of the current user.
1565   * @return bool True if user can create pages, false otherwise.
1566   * @since Moodle 3.1
1567   */
1568  function wiki_can_create_pages($context, $user = null) {
1569      return has_capability('mod/wiki:createpage', $context, $user);
1570  }
1571  
1572  /**
1573   * Get a sub wiki instance by wiki id, group id and user id.
1574   * If the wiki doesn't exist in DB it will return an isntance with id -1.
1575   *
1576   * @param int $wikiid  Wiki ID.
1577   * @param int $groupid Group ID.
1578   * @param int $userid  User ID.
1579   * @return object      Subwiki instance.
1580   * @since Moodle 3.1
1581   */
1582  function wiki_get_possible_subwiki_by_group($wikiid, $groupid, $userid = 0) {
1583      if (!$subwiki = wiki_get_subwiki_by_group($wikiid, $groupid, $userid)) {
1584          $subwiki = new stdClass();
1585          $subwiki->id = -1;
1586          $subwiki->wikiid = $wikiid;
1587          $subwiki->groupid = $groupid;
1588          $subwiki->userid = $userid;
1589      }
1590      return $subwiki;
1591  }
1592  
1593  /**
1594   * Get all the possible subwikis visible to the user in a wiki.
1595   * It will return all the subwikis that can be created in a wiki, even if they don't exist in DB yet.
1596   *
1597   * @param  stdClass $wiki          Wiki to get the subwikis from.
1598   * @param  cm_info|stdClass $cm    Optional. The course module object.
1599   * @param  context_module $context Optional. Context of wiki module.
1600   * @return array                   List of subwikis.
1601   * @since Moodle 3.1
1602   */
1603  function wiki_get_visible_subwikis($wiki, $cm = null, $context = null) {
1604      global $USER;
1605  
1606      $subwikis = array();
1607  
1608      if (empty($wiki) or !is_object($wiki)) {
1609          // Wiki not valid.
1610          return $subwikis;
1611      }
1612  
1613      if (empty($cm)) {
1614          $cm = get_coursemodule_from_instance('wiki', $wiki->id);
1615      }
1616      if (empty($context)) {
1617          $context = context_module::instance($cm->id);
1618      }
1619  
1620      if (!has_capability('mod/wiki:viewpage', $context)) {
1621          return $subwikis;
1622      }
1623  
1624      $manage = has_capability('mod/wiki:managewiki', $context);
1625  
1626      if (!$groupmode = groups_get_activity_groupmode($cm)) {
1627          // No groups.
1628          if ($wiki->wikimode == 'collaborative') {
1629              // Only 1 subwiki.
1630              $subwikis[] = wiki_get_possible_subwiki_by_group($wiki->id, 0, 0);
1631          } else if ($wiki->wikimode == 'individual') {
1632              // There's 1 subwiki per user.
1633              if ($manage) {
1634                  // User can view all subwikis.
1635                  $users = get_enrolled_users($context);
1636                  foreach ($users as $user) {
1637                      $subwikis[] = wiki_get_possible_subwiki_by_group($wiki->id, 0, $user->id);
1638                  }
1639              } else {
1640                  // User can only see his subwiki.
1641                  $subwikis[] = wiki_get_possible_subwiki_by_group($wiki->id, 0, $USER->id);
1642              }
1643          }
1644      } else {
1645          if ($wiki->wikimode == 'collaborative') {
1646              // 1 subwiki per group.
1647              $aag = has_capability('moodle/site:accessallgroups', $context);
1648              if ($aag || $groupmode == VISIBLEGROUPS) {
1649                  // User can see all groups.
1650                  $allowedgroups = groups_get_all_groups($cm->course, 0, $cm->groupingid);
1651                  $allparticipants = new stdClass();
1652                  $allparticipants->id = 0;
1653                  array_unshift($allowedgroups, $allparticipants); // Add all participants.
1654              } else {
1655                  // User can only see the groups he belongs to.
1656                  $allowedgroups = groups_get_all_groups($cm->course, $USER->id, $cm->groupingid);
1657              }
1658  
1659              foreach ($allowedgroups as $group) {
1660                  $subwikis[] = wiki_get_possible_subwiki_by_group($wiki->id, $group->id, 0);
1661              }
1662          } else if ($wiki->wikimode == 'individual') {
1663              // 1 subwiki per user and group.
1664  
1665              if ($manage || $groupmode == VISIBLEGROUPS) {
1666                  // User can view all subwikis.
1667                  $users = get_enrolled_users($context);
1668                  foreach ($users as $user) {
1669                      // Get all the groups this user belongs to.
1670                      $groups = groups_get_all_groups($cm->course, $user->id);
1671                      if (!empty($groups)) {
1672                          foreach ($groups as $group) {
1673                              $subwikis[] = wiki_get_possible_subwiki_by_group($wiki->id, $group->id, $user->id);
1674                          }
1675                      } else {
1676                          // User doesn't belong to any group, add it to group 0.
1677                          $subwikis[] = wiki_get_possible_subwiki_by_group($wiki->id, 0, $user->id);
1678                      }
1679                  }
1680              } else {
1681                  // The user can only see the subwikis of the groups he belongs.
1682                  $allowedgroups = groups_get_all_groups($cm->course, $USER->id, $cm->groupingid);
1683                  foreach ($allowedgroups as $group) {
1684                      $users = groups_get_members($group->id);
1685                      foreach ($users as $user) {
1686                          $subwikis[] = wiki_get_possible_subwiki_by_group($wiki->id, $group->id, $user->id);
1687                      }
1688                  }
1689              }
1690          }
1691      }
1692  
1693      return $subwikis;
1694  }
1695  
1696  /**
1697   * Utility function for getting a subwiki by group and user, validating that the user can view it.
1698   * If the subwiki doesn't exists in DB yet it'll have id -1.
1699   *
1700   * @param stdClass $wiki The wiki.
1701   * @param int $groupid Group ID. 0 means the subwiki doesn't use groups.
1702   * @param int $userid User ID. 0 means the subwiki doesn't use users.
1703   * @return stdClass Subwiki. If it doesn't exists in DB yet it'll have id -1. If the user can't view the
1704   *                  subwiki this function will return false.
1705   * @since  Moodle 3.1
1706   * @throws moodle_exception
1707   */
1708  function wiki_get_subwiki_by_group_and_user_with_validation($wiki, $groupid, $userid) {
1709      global $USER, $DB;
1710  
1711      // Get subwiki based on group and user.
1712      if (!$subwiki = wiki_get_subwiki_by_group($wiki->id, $groupid, $userid)) {
1713  
1714          // The subwiki doesn't exist.
1715          // Validate if user is valid.
1716          if ($userid != 0) {
1717              $user = core_user::get_user($userid, '*', MUST_EXIST);
1718              core_user::require_active_user($user);
1719          }
1720  
1721          // Validate that groupid is valid.
1722          if ($groupid != 0 && !groups_group_exists($groupid)) {
1723              throw new moodle_exception('cannotfindgroup', 'error');
1724          }
1725  
1726          // Valid data but subwiki not found. We'll simulate a subwiki object to check if the user would be able to see it
1727          // if it existed. If he's able to see it then we'll return an empty array because the subwiki has no pages.
1728          $subwiki = new stdClass();
1729          $subwiki->id = -1;
1730          $subwiki->wikiid = $wiki->id;
1731          $subwiki->userid = $userid;
1732          $subwiki->groupid = $groupid;
1733      }
1734  
1735      // Check that the user can view the subwiki. This function checks capabilities.
1736      if (!wiki_user_can_view($subwiki, $wiki)) {
1737          return false;
1738      }
1739  
1740      return $subwiki;
1741  }
1742  
1743  /**
1744   * Returns wiki pages tagged with a specified tag.
1745   *
1746   * This is a callback used by the tag area mod_wiki/wiki_pages to search for wiki pages
1747   * tagged with a specific tag.
1748   *
1749   * @param core_tag_tag $tag
1750   * @param bool $exclusivemode if set to true it means that no other entities tagged with this tag
1751   *             are displayed on the page and the per-page limit may be bigger
1752   * @param int $fromctx context id where the link was displayed, may be used by callbacks
1753   *            to display items in the same context first
1754   * @param int $ctx context id where to search for records
1755   * @param bool $rec search in subcontexts as well
1756   * @param int $page 0-based number of page being displayed
1757   * @return \core_tag\output\tagindex
1758   */
1759  function mod_wiki_get_tagged_pages($tag, $exclusivemode = false, $fromctx = 0, $ctx = 0, $rec = 1, $page = 0) {
1760      global $OUTPUT;
1761      $perpage = $exclusivemode ? 20 : 5;
1762  
1763      // Build the SQL query.
1764      $ctxselect = context_helper::get_preload_record_columns_sql('ctx');
1765      $query = "SELECT wp.id, wp.title, ws.userid, ws.wikiid, ws.id AS subwikiid, ws.groupid, w.wikimode,
1766                      cm.id AS cmid, c.id AS courseid, c.shortname, c.fullname, $ctxselect
1767                  FROM {wiki_pages} wp
1768                  JOIN {wiki_subwikis} ws ON wp.subwikiid = ws.id
1769                  JOIN {wiki} w ON w.id = ws.wikiid
1770                  JOIN {modules} m ON m.name='wiki'
1771                  JOIN {course_modules} cm ON cm.module = m.id AND cm.instance = w.id
1772                  JOIN {tag_instance} tt ON wp.id = tt.itemid
1773                  JOIN {course} c ON cm.course = c.id
1774                  JOIN {context} ctx ON ctx.instanceid = cm.id AND ctx.contextlevel = :coursemodulecontextlevel
1775                 WHERE tt.itemtype = :itemtype AND tt.tagid = :tagid AND tt.component = :component
1776                   AND cm.deletioninprogress = 0
1777                   AND wp.id %ITEMFILTER% AND c.id %COURSEFILTER%";
1778  
1779      $params = array('itemtype' => 'wiki_pages', 'tagid' => $tag->id, 'component' => 'mod_wiki',
1780          'coursemodulecontextlevel' => CONTEXT_MODULE);
1781  
1782      if ($ctx) {
1783          $context = $ctx ? context::instance_by_id($ctx) : context_system::instance();
1784          $query .= $rec ? ' AND (ctx.id = :contextid OR ctx.path LIKE :path)' : ' AND ctx.id = :contextid';
1785          $params['contextid'] = $context->id;
1786          $params['path'] = $context->path.'/%';
1787      }
1788  
1789      $query .= " ORDER BY ";
1790      if ($fromctx) {
1791          // In order-clause specify that modules from inside "fromctx" context should be returned first.
1792          $fromcontext = context::instance_by_id($fromctx);
1793          $query .= ' (CASE WHEN ctx.id = :fromcontextid OR ctx.path LIKE :frompath THEN 0 ELSE 1 END),';
1794          $params['fromcontextid'] = $fromcontext->id;
1795          $params['frompath'] = $fromcontext->path.'/%';
1796      }
1797      $query .= ' c.sortorder, cm.id, wp.id';
1798  
1799      $totalpages = $page + 1;
1800  
1801      // Use core_tag_index_builder to build and filter the list of items.
1802      $builder = new core_tag_index_builder('mod_wiki', 'wiki_pages', $query, $params, $page * $perpage, $perpage + 1);
1803      while ($item = $builder->has_item_that_needs_access_check()) {
1804          context_helper::preload_from_record($item);
1805          $courseid = $item->courseid;
1806          if (!$builder->can_access_course($courseid)) {
1807              $builder->set_accessible($item, false);
1808              continue;
1809          }
1810          $modinfo = get_fast_modinfo($builder->get_course($courseid));
1811          // Set accessibility of this item and all other items in the same course.
1812          $builder->walk(function ($taggeditem) use ($courseid, $modinfo, $builder) {
1813              if ($taggeditem->courseid == $courseid) {
1814                  $accessible = false;
1815                  if (($cm = $modinfo->get_cm($taggeditem->cmid)) && $cm->uservisible) {
1816                      $subwiki = (object)array('id' => $taggeditem->subwikiid, 'groupid' => $taggeditem->groupid,
1817                          'userid' => $taggeditem->userid, 'wikiid' => $taggeditem->wikiid);
1818                      $wiki = (object)array('id' => $taggeditem->wikiid, 'wikimode' => $taggeditem->wikimode,
1819                          'course' => $cm->course);
1820                      $accessible = wiki_user_can_view($subwiki, $wiki);
1821                  }
1822                  $builder->set_accessible($taggeditem, $accessible);
1823              }
1824          });
1825      }
1826  
1827      $items = $builder->get_items();
1828      if (count($items) > $perpage) {
1829          $totalpages = $page + 2; // We don't need exact page count, just indicate that the next page exists.
1830          array_pop($items);
1831      }
1832  
1833      // Build the display contents.
1834      if ($items) {
1835          $tagfeed = new core_tag\output\tagfeed();
1836          foreach ($items as $item) {
1837              context_helper::preload_from_record($item);
1838              $modinfo = get_fast_modinfo($item->courseid);
1839              $cm = $modinfo->get_cm($item->cmid);
1840              $pageurl = new moodle_url('/mod/wiki/view.php', array('pageid' => $item->id));
1841              $pagename = format_string($item->title, true, array('context' => context_module::instance($item->cmid)));
1842              $pagename = html_writer::link($pageurl, $pagename);
1843              $courseurl = course_get_url($item->courseid, $cm->sectionnum);
1844              $cmname = html_writer::link($cm->url, $cm->get_formatted_name());
1845              $coursename = format_string($item->fullname, true, array('context' => context_course::instance($item->courseid)));
1846              $coursename = html_writer::link($courseurl, $coursename);
1847              $icon = html_writer::link($pageurl, html_writer::empty_tag('img', array('src' => $cm->get_icon_url())));
1848              $tagfeed->add($icon, $pagename, $cmname.'<br>'.$coursename);
1849          }
1850  
1851          $content = $OUTPUT->render_from_template('core_tag/tagfeed',
1852                  $tagfeed->export_for_template($OUTPUT));
1853  
1854          return new core_tag\output\tagindex($tag, 'mod_wiki', 'wiki_pages', $content,
1855                  $exclusivemode, $fromctx, $ctx, $rec, $page, $totalpages);
1856      }
1857  }