mod/wiki/lib.php

   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  * Library of functions and constants for module wiki
  20  *
  21  * It contains the great majority of functions defined by Moodle
  22  * that are mandatory to develop a module.
  23  *
  24  * @package mod_wiki
  25  * @copyright 2009 Marc Alier, Jordi Piguillem marc.alier@upc.edu
  26  * @copyright 2009 Universitat Politecnica de Catalunya http://www.upc.edu
  27  *
  28  * @author Jordi Piguillem
  29  * @author Marc Alier
  30  * @author David Jimenez
  31  * @author Josep Arus
  32  * @author Kenneth Riba
  33  *
  34  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  35  */
  36
  37 defined('MOODLE_INTERNAL') || die();
  38
  39 /**
  40  * Given an object containing all the necessary data,
  41  * (defined by the form in mod.html) this function
  42  * will create a new instance and return the id number
  43  * of the new instance.
  44  *
  45  * @param object $instance An object from the form in mod.html
  46  * @return int The id of the newly inserted wiki record
  47  **/
  48 function wiki_add_instance($wiki) {
  49     global $DB;
  50
  51     $wiki->timemodified = time();
  52     # May have to add extra stuff in here #
  53     if (empty($wiki->forceformat)) {
  54         $wiki->forceformat = 0;
  55     }
  56
  57     $id = $DB->insert_record('wiki', $wiki);
  58
  59     $completiontimeexpected = !empty($wiki->completionexpected) ? $wiki->completionexpected : null;
  60     \core_completion\api::update_completion_date_event($wiki->coursemodule, 'wiki', $id, $completiontimeexpected);
  61
  62     return $id;
  63 }
  64
  65 /**
  66  * Given an object containing all the necessary data,
  67  * (defined by the form in mod.html) this function
  68  * will update an existing instance with new data.
  69  *
  70  * @param object $instance An object from the form in mod.html
  71  * @return boolean Success/Fail
  72  **/
  73 function wiki_update_instance($wiki) {
  74     global $DB;
  75
  76     $wiki->timemodified = time();
  77     $wiki->id = $wiki->instance;
  78     if (empty($wiki->forceformat)) {
  79         $wiki->forceformat = 0;
  80     }
  81
  82     $completiontimeexpected = !empty($wiki->completionexpected) ? $wiki->completionexpected : null;
  83     \core_completion\api::update_completion_date_event($wiki->coursemodule, 'wiki', $wiki->id, $completiontimeexpected);
  84
  85     # May have to add extra stuff in here #
  86
  87     return $DB->update_record('wiki', $wiki);
  88 }
  89
  90 /**
  91  * Given an ID of an instance of this module,
  92  * this function will permanently delete the instance
  93  * and any data that depends on it.
  94  *
  95  * @param int $id Id of the module instance
  96  * @return boolean Success/Failure
  97  **/
  98 function wiki_delete_instance($id) {
  99     global $DB;
 100
 101     if (!$wiki = $DB->get_record('wiki', array('id' => $id))) {
 102         return false;
 103     }
 104
 105     $result = true;
 106
 107     # Get subwiki information #
 108     $subwikis = $DB->get_records('wiki_subwikis', array('wikiid' => $wiki->id));
 109
 110     foreach ($subwikis as $subwiki) {
 111         # Get existing links, and delete them #
 112         if (!$DB->delete_records('wiki_links', array('subwikiid' => $subwiki->id), IGNORE_MISSING)) {
 113             $result = false;
 114         }
 115
 116         # Get existing pages #
 117         if ($pages = $DB->get_records('wiki_pages', array('subwikiid' => $subwiki->id))) {
 118             foreach ($pages as $page) {
 119                 # Get locks, and delete them #
 120                 if (!$DB->delete_records('wiki_locks', array('pageid' => $page->id), IGNORE_MISSING)) {
 121                     $result = false;
 122                 }
 123
 124                 # Get versions, and delete them #
 125                 if (!$DB->delete_records('wiki_versions', array('pageid' => $page->id), IGNORE_MISSING)) {
 126                     $result = false;
 127                 }
 128             }
 129
 130             # Delete pages #
 131             if (!$DB->delete_records('wiki_pages', array('subwikiid' => $subwiki->id), IGNORE_MISSING)) {
 132                 $result = false;
 133             }
 134         }
 135
 136         # Get existing synonyms, and delete them #
 137         if (!$DB->delete_records('wiki_synonyms', array('subwikiid' => $subwiki->id), IGNORE_MISSING)) {
 138             $result = false;
 139         }
 140
 141         # Delete any subwikis #
 142         if (!$DB->delete_records('wiki_subwikis', array('id' => $subwiki->id), IGNORE_MISSING)) {
 143             $result = false;
 144         }
 145     }
 146
 147     $cm = get_coursemodule_from_instance('wiki', $id);
 148     \core_completion\api::update_completion_date_event($cm->id, 'wiki', $wiki->id, null);
 149
 150     # Delete any dependent records here #
 151     if (!$DB->delete_records('wiki', array('id' => $wiki->id))) {
 152         $result = false;
 153     }
 154
 155     return $result;
 156 }
 157
 158 /**
 159  * Implements callback to reset course
 160  *
 161  * @param stdClass $data
 162  * @return boolean|array
 163  */
 164 function wiki_reset_userdata($data) {
 165     global $CFG,$DB;
 166     require_once($CFG->dirroot . '/mod/wiki/pagelib.php');
 167     require_once($CFG->dirroot . "/mod/wiki/locallib.php");
 168
 169     $componentstr = get_string('modulenameplural', 'wiki');
 170     $status = array();
 171
 172     //get the wiki(s) in this course.
 173     if (!$wikis = $DB->get_records('wiki', array('course' => $data->courseid))) {
 174         return false;
 175     }
 176     if (empty($data->reset_wiki_comments) && empty($data->reset_wiki_tags) && empty($data->reset_wiki_pages)) {
 177         return $status;
 178     }
 179
 180     foreach ($wikis as $wiki) {
 181         if (!$cm = get_coursemodule_from_instance('wiki', $wiki->id, $data->courseid)) {
 182             continue;
 183         }
 184         $context = context_module::instance($cm->id);
 185
 186         // Remove tags or all pages.
 187         if (!empty($data->reset_wiki_pages) || !empty($data->reset_wiki_tags)) {
 188
 189             // Get subwiki information.
 190             $subwikis = wiki_get_subwikis($wiki->id);
 191
 192             foreach ($subwikis as $subwiki) {
 193                 // Get existing pages.
 194                 if ($pages = wiki_get_page_list($subwiki->id)) {
 195                     // If the wiki page isn't selected then we are only removing tags.
 196                     if (empty($data->reset_wiki_pages)) {
 197                         // Go through each page and delete the tags.
 198                         foreach ($pages as $page) {
 199                             core_tag_tag::remove_all_item_tags('mod_wiki', 'wiki_pages', $page->id);
 200                         }
 201                     } else {
 202                         // Otherwise we are removing pages and tags.
 203                         wiki_delete_pages($context, $pages, $subwiki->id);
 204                     }
 205                 }
 206                 if (!empty($data->reset_wiki_pages)) {
 207                     // Delete any subwikis.
 208                     $DB->delete_records('wiki_subwikis', array('id' => $subwiki->id), IGNORE_MISSING);
 209
 210                     // Delete any attached files.
 211                     $fs = get_file_storage();
 212                     $fs->delete_area_files($context->id, 'mod_wiki', 'attachments');
 213                 }
 214             }
 215
 216             if (!empty($data->reset_wiki_pages)) {
 217                 $status[] = array('component' => $componentstr, 'item' => get_string('deleteallpages', 'wiki'),
 218                     'error' => false);
 219             }
 220             if (!empty($data->reset_wiki_tags)) {
 221                 $status[] = array('component' => $componentstr, 'item' => get_string('tagsdeleted', 'wiki'), 'error' => false);
 222             }
 223         }
 224
 225         // Remove all comments.
 226         if (!empty($data->reset_wiki_comments) || !empty($data->reset_wiki_pages)) {
 227             $DB->delete_records_select('comments', "contextid = ? AND commentarea='wiki_page'", array($context->id));
 228             if (!empty($data->reset_wiki_comments)) {
 229                 $status[] = array('component' => $componentstr, 'item' => get_string('deleteallcomments'), 'error' => false);
 230             }
 231         }
 232     }
 233
 234     // Any changes to the list of dates that needs to be rolled should be same during course restore and course reset.
 235     // See MDL-9367.
 236     shift_course_mod_dates('wiki', array('editbegin', 'editend'), $data->timeshift, $data->courseid);
 237     $status[] = array('component' => $componentstr, 'item' => get_string('datechanged'), 'error' => false);
 238
 239     return $status;
 240 }
 241
 242
 243 function wiki_reset_course_form_definition(&$mform) {
 244     $mform->addElement('header', 'wikiheader', get_string('modulenameplural', 'wiki'));
 245     $mform->addElement('advcheckbox', 'reset_wiki_pages', get_string('deleteallpages', 'wiki'));
 246     $mform->addElement('advcheckbox', 'reset_wiki_tags', get_string('removeallwikitags', 'wiki'));
 247     $mform->addElement('advcheckbox', 'reset_wiki_comments', get_string('deleteallcomments'));
 248 }
 249
 250 /**
 251  * Indicates API features that the wiki supports.
 252  *
 253  * @uses FEATURE_GROUPS
 254  * @uses FEATURE_GROUPINGS
 255  * @uses FEATURE_MOD_INTRO
 256  * @uses FEATURE_COMPLETION_TRACKS_VIEWS
 257  * @uses FEATURE_COMPLETION_HAS_RULES
 258  * @uses FEATURE_GRADE_HAS_GRADE
 259  * @uses FEATURE_GRADE_OUTCOMES
 260  * @param string $feature
 261  * @return mixed True if module supports feature, false if not, null if doesn't know or string for the module purpose.
 262  */
 263 function wiki_supports($feature) {
 264     switch ($feature) {
 265     case FEATURE_GROUPS:
 266         return true;
 267     case FEATURE_GROUPINGS:
 268         return true;
 269     case FEATURE_MOD_INTRO:
 270         return true;
 271     case FEATURE_COMPLETION_TRACKS_VIEWS:
 272         return true;
 273     case FEATURE_GRADE_HAS_GRADE:
 274         return false;
 275     case FEATURE_GRADE_OUTCOMES:
 276         return false;
 277     case FEATURE_RATE:
 278         return false;
 279     case FEATURE_BACKUP_MOODLE2:
 280         return true;
 281     case FEATURE_SHOW_DESCRIPTION:
 282         return true;
 283     case FEATURE_COMMENT:
 284         return true;
 285     case FEATURE_MOD_PURPOSE:
 286         return MOD_PURPOSE_COLLABORATION;
 287
 288     default:
 289         return null;
 290     }
 291 }
 292
 293 /**
 294  * Given a course and a time, this module should find recent activity
 295  * that has occurred in wiki activities and print it out.
 296  * Return true if there was output, or false is there was none.
 297  *
 298  * @global $CFG
 299  * @global $DB
 300  * @uses CONTEXT_MODULE
 301  * @uses VISIBLEGROUPS
 302  * @param object $course
 303  * @param bool $viewfullnames capability
 304  * @param int $timestart
 305  * @return boolean
 306  **/
 307 function wiki_print_recent_activity($course, $viewfullnames, $timestart) {
 308     global $CFG, $DB, $OUTPUT;
 309
 310     $sql = "SELECT p.id, p.timemodified, p.subwikiid, sw.wikiid, w.wikimode, sw.userid, sw.groupid
 311             FROM {wiki_pages} p
 312                 JOIN {wiki_subwikis} sw ON sw.id = p.subwikiid
 313                 JOIN {wiki} w ON w.id = sw.wikiid
 314             WHERE p.timemodified > ? AND w.course = ?
 315             ORDER BY p.timemodified ASC";
 316     if (!$pages = $DB->get_records_sql($sql, array($timestart, $course->id))) {
 317         return false;
 318     }
 319     require_once($CFG->dirroot . "/mod/wiki/locallib.php");
 320
 321     $wikis = array();
 322
 323     $modinfo = get_fast_modinfo($course);
 324
 325     $subwikivisible = array();
 326     foreach ($pages as $page) {
 327         if (!isset($subwikivisible[$page->subwikiid])) {
 328             $subwiki = (object)array('id' => $page->subwikiid, 'wikiid' => $page->wikiid,
 329                 'groupid' => $page->groupid, 'userid' => $page->userid);
 330             $wiki = (object)array('id' => $page->wikiid, 'course' => $course->id, 'wikimode' => $page->wikimode);
 331             $subwikivisible[$page->subwikiid] = wiki_user_can_view($subwiki, $wiki);
 332         }
 333         if ($subwikivisible[$page->subwikiid]) {
 334             $wikis[] = $page;
 335         }
 336     }
 337     unset($subwikivisible);
 338     unset($pages);
 339
 340     if (!$wikis) {
 341         return false;
 342     }
 343     echo $OUTPUT->heading(get_string("updatedwikipages", 'wiki') . ':', 6);
 344     foreach ($wikis as $wiki) {
 345         $cm = $modinfo->instances['wiki'][$wiki->wikiid];
 346         $link = $CFG->wwwroot . '/mod/wiki/view.php?pageid=' . $wiki->id;
 347         print_recent_activity_note($wiki->timemodified, $wiki, $cm->name, $link, false, $viewfullnames);
 348     }
 349
 350     return true; //  True if anything was printed, otherwise false
 351 }
 352
 353 /**
 354  * Must return an array of grades for a given instance of this module,
 355  * indexed by user.  It also returns a maximum allowed grade.
 356  *
 357  * Example:
 358  *    $return->grades = array of grades;
 359  *    $return->maxgrade = maximum allowed grade;
 360  *
 361  *    return $return;
 362  *
 363  * @param int $wikiid ID of an instance of this module
 364  * @return mixed Null or object with an array of grades and with the maximum grade
 365  **/
 366 function wiki_grades($wikiid) {
 367     return null;
 368 }
 369
 370 /**
 371  * @deprecated since Moodle 3.8
 372  */
 373 function wiki_scale_used() {
 374     throw new coding_exception('wiki_scale_used() can not be used anymore. Plugins can implement ' .
 375         '<modname>_scale_used_anywhere, all implementations of <modname>_scale_used are now ignored');
 376 }
 377
 378 /**
 379  * Checks if scale is being used by any instance of wiki.
 380  * This function was added in 1.9
 381  *
 382  * This is used to find out if scale used anywhere
 383  * @param $scaleid int
 384  * @return boolean True if the scale is used by any wiki
 385  */
 386 function wiki_scale_used_anywhere($scaleid) {
 387     global $DB;
 388
 389     //if ($scaleid and $DB->record_exists('wiki', array('grade' => -$scaleid))) {
 390     //    return true;
 391     //} else {
 392     //    return false;
 393     //}
 394
 395     return false;
 396 }
 397
 398 /**
 399  * file serving callback
 400  *
 401  * @copyright Josep Arus
 402  * @package  mod_wiki
 403  * @category files
 404  * @param stdClass $course course object
 405  * @param stdClass $cm course module object
 406  * @param stdClass $context context object
 407  * @param string $filearea file area
 408  * @param array $args extra arguments
 409  * @param bool $forcedownload whether or not force download
 410  * @param array $options additional options affecting the file serving
 411  * @return bool false if the file was not found, just send the file otherwise and do not return anything
 412  */
 413 function wiki_pluginfile($course, $cm, $context, $filearea, $args, $forcedownload, array $options=array()) {
 414     global $CFG;
 415
 416     if ($context->contextlevel != CONTEXT_MODULE) {
 417         return false;
 418     }
 419
 420     require_login($course, true, $cm);
 421
 422     require_once($CFG->dirroot . "/mod/wiki/locallib.php");
 423
 424     if ($filearea == 'attachments') {
 425         $swid = (int) array_shift($args);
 426
 427         if (!$subwiki = wiki_get_subwiki($swid)) {
 428             return false;
 429         }
 430
 431         require_capability('mod/wiki:viewpage', $context);
 432
 433         $relativepath = implode('/', $args);
 434
 435         $fullpath = "/$context->id/mod_wiki/attachments/$swid/$relativepath";
 436
 437         $fs = get_file_storage();
 438         if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
 439             return false;
 440         }
 441
 442         send_stored_file($file, null, 0, $options);
 443     }
 444 }
 445
 446 /**
 447  * Search for wiki
 448  *
 449  * @param stdClass $cm course module object
 450  * @param string $search searchword.
 451  * @param stdClass $subwiki Optional Subwiki.
 452  * @return Search wiki input form
 453  */
 454 function wiki_search_form($cm, $search = '', $subwiki = null) {
 455     global $OUTPUT;
 456
 457     $hiddenfields = [
 458         (object) ['type' => 'hidden', 'name' => 'courseid', 'value' => $cm->course],
 459         (object) ['type' => 'hidden', 'name' => 'cmid', 'value' => $cm->id],
 460         (object) ['type' => 'hidden', 'name' => 'searchwikicontent', 'value' => 1],
 461     ];
 462     if (!empty($subwiki->id)) {
 463         $hiddenfields[] = (object) ['type' => 'hidden', 'name' => 'subwikiid', 'value' => $subwiki->id];
 464     }
 465     $data = [
 466         'action' => new moodle_url('/mod/wiki/search.php'),
 467         'hiddenfields' => $hiddenfields,
 468         'inputname' => 'searchstring',
 469         'query' => s($search, true),
 470         'searchstring' => get_string('searchwikis', 'wiki'),
 471         'extraclasses' => 'mt-2'
 472     ];
 473     return $OUTPUT->render_from_template('core/search_input', $data);
 474 }
 475
 476 /**
 477  * Extends the global navigation tree by adding wiki nodes if there is a relevant content
 478  *
 479  * This can be called by an AJAX request so do not rely on $PAGE as it might not be set up properly.
 480  *
 481  * @param navigation_node $navref An object representing the navigation tree node of the workshop module instance
 482  * @param stdClass $course the course object
 483  * @param stdClass $instance the activity record object
 484  * @param cm_info $cm the course module object
 485  */
 486 function wiki_extend_navigation(navigation_node $navref, stdClass $course, stdClass $instance, cm_info $cm) {
 487     global $CFG, $USER;
 488
 489     require_once($CFG->dirroot . '/mod/wiki/locallib.php');
 490
 491     $context = context_module::instance($cm->id);
 492     $userid = ($instance->wikimode == 'individual') ? $USER->id : 0;
 493     $gid = groups_get_activity_group($cm) ?: 0;
 494
 495     if (!$subwiki = wiki_get_subwiki_by_group($cm->instance, $gid, $userid)) {
 496         return;
 497     }
 498
 499     $pageid = optional_param('pageid', null, PARAM_INT);
 500     if (empty($pageid)) {
 501         // wiki main page
 502         $page = wiki_get_page_by_title($subwiki->id, $instance->firstpagetitle);
 503         $pageid = $page->id;
 504     }
 505
 506     if (wiki_can_create_pages($context)) {
 507         $link = new moodle_url('/mod/wiki/create.php', ['action' => 'new', 'swid' => $subwiki->id]);
 508         $navref->add(get_string('newpage', 'wiki'), $link, navigation_node::TYPE_SETTING);
 509     }
 510
 511     if (empty($pageid)) {
 512         return;
 513     }
 514
 515     $canviewpage = has_capability('mod/wiki:viewpage', $context);
 516
 517     if ($canviewpage) {
 518         $link = new moodle_url('/mod/wiki/view.php', ['pageid' => $pageid]);
 519         $navref->add(get_string('view', 'wiki'), $link, navigation_node::TYPE_SETTING);
 520     }
 521
 522     if (wiki_user_can_edit($subwiki)) {
 523         $link = new moodle_url('/mod/wiki/edit.php', ['pageid' => $pageid]);
 524         $navref->add(get_string('edit', 'wiki'), $link, navigation_node::TYPE_SETTING);
 525     }
 526
 527     if (has_capability('mod/wiki:viewcomment', $context)) {
 528         $link = new moodle_url('/mod/wiki/comments.php', ['pageid' => $pageid]);
 529         $navref->add(get_string('comments', 'wiki'), $link, navigation_node::TYPE_SETTING);
 530     }
 531
 532     if ($canviewpage) {
 533         $link = new moodle_url('/mod/wiki/history.php', ['pageid' => $pageid]);
 534         $navref->add(get_string('history', 'wiki'), $link, navigation_node::TYPE_SETTING);
 535
 536         $link = new moodle_url('/mod/wiki/map.php', ['pageid' => $pageid]);
 537         $navref->add(get_string('map', 'wiki'), $link, navigation_node::TYPE_SETTING);
 538
 539         $link = new moodle_url('/mod/wiki/files.php', ['pageid' => $pageid]);
 540         $navref->add(get_string('files', 'wiki'), $link, navigation_node::TYPE_SETTING);
 541     }
 542
 543     if (has_capability('mod/wiki:managewiki', $context)) {
 544         $link = new moodle_url('/mod/wiki/admin.php', ['pageid' => $pageid]);
 545         $navref->add(get_string('admin', 'wiki'), $link, navigation_node::TYPE_SETTING);
 546     }
 547 }
 548 /**
 549  * Returns all other caps used in wiki module
 550  *
 551  * @return array
 552  */
 553 function wiki_get_extra_capabilities() {
 554     return array('moodle/comment:view', 'moodle/comment:post', 'moodle/comment:delete');
 555 }
 556
 557 /**
 558  * Running addtional permission check on plugin, for example, plugins
 559  * may have switch to turn on/off comments option, this callback will
 560  * affect UI display, not like pluginname_comment_validate only throw
 561  * exceptions.
 562  * Capability check has been done in comment->check_permissions(), we
 563  * don't need to do it again here.
 564  *
 565  * @package  mod_wiki
 566  * @category comment
 567  *
 568  * @param stdClass $comment_param {
 569  *              context  => context the context object
 570  *              courseid => int course id
 571  *              cm       => stdClass course module object
 572  *              commentarea => string comment area
 573  *              itemid      => int itemid
 574  * }
 575  * @return array
 576  */
 577 function wiki_comment_permissions($comment_param) {
 578     return array('post'=>true, 'view'=>true);
 579 }
 580
 581 /**
 582  * Validate comment parameter before perform other comments actions
 583  *
 584  * @param stdClass $comment_param {
 585  *              context  => context the context object
 586  *              courseid => int course id
 587  *              cm       => stdClass course module object
 588  *              commentarea => string comment area
 589  *              itemid      => int itemid
 590  * }
 591  *
 592  * @package  mod_wiki
 593  * @category comment
 594  *
 595  * @return boolean
 596  */
 597 function wiki_comment_validate($comment_param) {
 598     global $DB, $CFG;
 599     require_once($CFG->dirroot . '/mod/wiki/locallib.php');
 600     // validate comment area
 601     if ($comment_param->commentarea != 'wiki_page') {
 602         throw new comment_exception('invalidcommentarea');
 603     }
 604     // validate itemid
 605     if (!$record = $DB->get_record('wiki_pages', array('id'=>$comment_param->itemid))) {
 606         throw new comment_exception('invalidcommentitemid');
 607     }
 608     if (!$subwiki = wiki_get_subwiki($record->subwikiid)) {
 609         throw new comment_exception('invalidsubwikiid');
 610     }
 611     if (!$wiki = wiki_get_wiki_from_pageid($comment_param->itemid)) {
 612         throw new comment_exception('invalidid', 'data');
 613     }
 614     if (!$course = $DB->get_record('course', array('id'=>$wiki->course))) {
 615         throw new comment_exception('coursemisconf');
 616     }
 617     if (!$cm = get_coursemodule_from_instance('wiki', $wiki->id, $course->id)) {
 618         throw new comment_exception('invalidcoursemodule');
 619     }
 620     $context = context_module::instance($cm->id);
 621     // group access
 622     if ($subwiki->groupid) {
 623         $groupmode = groups_get_activity_groupmode($cm, $course);
 624         if ($groupmode == SEPARATEGROUPS and !has_capability('moodle/site:accessallgroups', $context)) {
 625             if (!groups_is_member($subwiki->groupid)) {
 626                 throw new comment_exception('notmemberofgroup');
 627             }
 628         }
 629     }
 630     // validate context id
 631     if ($context->id != $comment_param->context->id) {
 632         throw new comment_exception('invalidcontext');
 633     }
 634     // validation for comment deletion
 635     if (!empty($comment_param->commentid)) {
 636         if ($comment = $DB->get_record('comments', array('id'=>$comment_param->commentid))) {
 637             if ($comment->commentarea != 'wiki_page') {
 638                 throw new comment_exception('invalidcommentarea');
 639             }
 640             if ($comment->contextid != $context->id) {
 641                 throw new comment_exception('invalidcontext');
 642             }
 643             if ($comment->itemid != $comment_param->itemid) {
 644                 throw new comment_exception('invalidcommentitemid');
 645             }
 646         } else {
 647             throw new comment_exception('invalidcommentid');
 648         }
 649     }
 650     return true;
 651 }
 652
 653 /**
 654  * Return a list of page types
 655  * @param string $pagetype current page type
 656  * @param stdClass $parentcontext Block's parent context
 657  * @param stdClass $currentcontext Current context of block
 658  */
 659 function wiki_page_type_list($pagetype, $parentcontext, $currentcontext) {
 660     $module_pagetype = array(
 661         'mod-wiki-*'=>get_string('page-mod-wiki-x', 'wiki'),
 662         'mod-wiki-view'=>get_string('page-mod-wiki-view', 'wiki'),
 663         'mod-wiki-comments'=>get_string('page-mod-wiki-comments', 'wiki'),
 664         'mod-wiki-history'=>get_string('page-mod-wiki-history', 'wiki'),
 665         'mod-wiki-map'=>get_string('page-mod-wiki-map', 'wiki')
 666     );
 667     return $module_pagetype;
 668 }
 669
 670 /**
 671  * Mark the activity completed (if required) and trigger the course_module_viewed event.
 672  *
 673  * @param  stdClass $wiki       Wiki object.
 674  * @param  stdClass $course     Course object.
 675  * @param  stdClass $cm         Course module object.
 676  * @param  stdClass $context    Context object.
 677  * @since Moodle 3.1
 678  */
 679 function wiki_view($wiki, $course, $cm, $context) {
 680     // Trigger course_module_viewed event.
 681     $params = array(
 682         'context' => $context,
 683         'objectid' => $wiki->id
 684     );
 685     $event = \mod_wiki\event\course_module_viewed::create($params);
 686     $event->add_record_snapshot('course_modules', $cm);
 687     $event->add_record_snapshot('course', $course);
 688     $event->add_record_snapshot('wiki', $wiki);
 689     $event->trigger();
 690
 691     // Completion.
 692     $completion = new completion_info($course);
 693     $completion->set_module_viewed($cm);
 694 }
 695
 696 /**
 697  * Mark the activity completed (if required) and trigger the page_viewed event.
 698  *
 699  * @param  stdClass $wiki       Wiki object.
 700  * @param  stdClass $page       Page object.
 701  * @param  stdClass $course     Course object.
 702  * @param  stdClass $cm         Course module object.
 703  * @param  stdClass $context    Context object.
 704  * @param  int $uid             Optional User ID.
 705  * @param  array $other         Optional Other params: title, wiki ID, group ID, groupanduser, prettyview.
 706  * @param  stdClass $subwiki    Optional Subwiki.
 707  * @since Moodle 3.1
 708  */
 709 function wiki_page_view($wiki, $page, $course, $cm, $context, $uid = null, $other = null, $subwiki = null) {
 710
 711     // Trigger course_module_viewed event.
 712     $params = array(
 713         'context' => $context,
 714         'objectid' => $page->id
 715     );
 716     if ($uid != null) {
 717         $params['relateduserid'] = $uid;
 718     }
 719     if ($other != null) {
 720         $params['other'] = $other;
 721     }
 722
 723     $event = \mod_wiki\event\page_viewed::create($params);
 724
 725     $event->add_record_snapshot('wiki_pages', $page);
 726     $event->add_record_snapshot('course_modules', $cm);
 727     $event->add_record_snapshot('course', $course);
 728     $event->add_record_snapshot('wiki', $wiki);
 729     if ($subwiki != null) {
 730         $event->add_record_snapshot('wiki_subwikis', $subwiki);
 731     }
 732     $event->trigger();
 733
 734     // Completion.
 735     $completion = new completion_info($course);
 736     $completion->set_module_viewed($cm);
 737 }
 738
 739 /**
 740  * Check if the module has any update that affects the current user since a given time.
 741  *
 742  * @param  cm_info $cm course module data
 743  * @param  int $from the time to check updates from
 744  * @param  array $filter  if we need to check only specific updates
 745  * @return stdClass an object with the different type of areas indicating if they were updated or not
 746  * @since Moodle 3.2
 747  */
 748 function wiki_check_updates_since(cm_info $cm, $from, $filter = array()) {
 749     global $DB, $CFG;
 750     require_once($CFG->dirroot . '/mod/wiki/locallib.php');
 751
 752     $updates = new stdClass();
 753     if (!has_capability('mod/wiki:viewpage', $cm->context)) {
 754         return $updates;
 755     }
 756     $updates = course_check_module_updates_since($cm, $from, array('attachments'), $filter);
 757
 758     // Check only pages updated in subwikis the user can access.
 759     $updates->pages = (object) array('updated' => false);
 760     $wiki = $DB->get_record($cm->modname, array('id' => $cm->instance), '*', MUST_EXIST);
 761     if ($subwikis = wiki_get_visible_subwikis($wiki, $cm, $cm->context)) {
 762         $subwikisids = array();
 763         foreach ($subwikis as $subwiki) {
 764             $subwikisids[] = $subwiki->id;
 765         }
 766         list($subwikissql, $params) = $DB->get_in_or_equal($subwikisids, SQL_PARAMS_NAMED);
 767         $select = 'subwikiid ' . $subwikissql . ' AND (timemodified > :since1 OR timecreated > :since2)';
 768         $params['since1'] = $from;
 769         $params['since2'] = $from;
 770         $pages = $DB->get_records_select('wiki_pages', $select, $params, '', 'id');
 771         if (!empty($pages)) {
 772             $updates->pages->updated = true;
 773             $updates->pages->itemids = array_keys($pages);
 774         }
 775     }
 776     return $updates;
 777 }
 778
 779 /**
 780  * Get icon mapping for font-awesome.
 781  */
 782 function mod_wiki_get_fontawesome_icon_map() {
 783     return [
 784         'mod_wiki:attachment' => 'fa-paperclip',
 785     ];
 786 }
 787
 788 /**
 789  * This function receives a calendar event and returns the action associated with it, or null if there is none.
 790  *
 791  * This is used by block_myoverview in order to display the event appropriately. If null is returned then the event
 792  * is not displayed on the block.
 793  *
 794  * @param calendar_event $event
 795  * @param \core_calendar\action_factory $factory
 796  * @param int $userid User id to use for all capability checks, etc. Set to 0 for current user (default).
 797  * @return \core_calendar\local\event\entities\action_interface|null
 798  */
 799 function mod_wiki_core_calendar_provide_event_action(calendar_event $event,
 800                                                     \core_calendar\action_factory $factory,
 801                                                     int $userid = 0) {
 802     global $USER;
 803
 804     if (!$userid) {
 805         $userid = $USER->id;
 806     }
 807
 808     $cm = get_fast_modinfo($event->courseid, $userid)->instances['wiki'][$event->instance];
 809
 810     if (!$cm->uservisible) {
 811         // The module is not visible to the user for any reason.
 812         return null;
 813     }
 814
 815     $completion = new \completion_info($cm->get_course());
 816
 817     $completiondata = $completion->get_data($cm, false, $userid);
 818
 819     if ($completiondata->completionstate != COMPLETION_INCOMPLETE) {
 820         return null;
 821     }
 822
 823     return $factory->create_instance(
 824         get_string('view'),
 825         new \moodle_url('/mod/wiki/view.php', ['id' => $cm->id]),
 826         1,
 827         true
 828     );
 829 }
 830
 831 /**
 832  * Sets dynamic information about a course module
 833  *
 834  * This callback is called from cm_info when checking module availability (incl. $cm->uservisible)
 835  *
 836  * Main viewing capability in mod_wiki is 'mod/wiki:viewpage' instead of the expected standardised 'mod/wiki:view'.
 837  * The method cm_info::is_user_access_restricted_by_capability() does not work for wiki, we need to implement
 838  * this callback.
 839  *
 840  * @param cm_info $cm
 841  */
 842 function wiki_cm_info_dynamic(cm_info $cm) {
 843     if (!has_capability('mod/wiki:viewpage', $cm->context, $cm->get_modinfo()->get_user_id())) {
 844         $cm->set_available(false);
 845     }
 846 }