mod/wiki/locallib.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  * 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 }