mod/page/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  * @package mod_page
  20  * @copyright  2009 Petr Skoda (http://skodak.org)
  21  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  22  */
  23
  24 defined('MOODLE_INTERNAL') || die;
  25
  26 /**
  27  * List of features supported in Page module
  28  * @param string $feature FEATURE_xx constant for requested feature
  29  * @return mixed True if module supports feature, false if not, null if doesn't know or string for the module purpose.
  30  */
  31 function page_supports($feature) {
  32     switch($feature) {
  33         case FEATURE_MOD_ARCHETYPE:           return MOD_ARCHETYPE_RESOURCE;
  34         case FEATURE_GROUPS:                  return false;
  35         case FEATURE_GROUPINGS:               return false;
  36         case FEATURE_MOD_INTRO:               return true;
  37         case FEATURE_COMPLETION_TRACKS_VIEWS: return true;
  38         case FEATURE_GRADE_HAS_GRADE:         return false;
  39         case FEATURE_GRADE_OUTCOMES:          return false;
  40         case FEATURE_BACKUP_MOODLE2:          return true;
  41         case FEATURE_SHOW_DESCRIPTION:        return true;
  42         case FEATURE_MOD_PURPOSE:             return MOD_PURPOSE_CONTENT;
  43
  44         default: return null;
  45     }
  46 }
  47
  48 /**
  49  * This function is used by the reset_course_userdata function in moodlelib.
  50  * @param $data the data submitted from the reset course.
  51  * @return array status array
  52  */
  53 function page_reset_userdata($data) {
  54
  55     // Any changes to the list of dates that needs to be rolled should be same during course restore and course reset.
  56     // See MDL-9367.
  57
  58     return array();
  59 }
  60
  61 /**
  62  * List the actions that correspond to a view of this module.
  63  * This is used by the participation report.
  64  *
  65  * Note: This is not used by new logging system. Event with
  66  *       crud = 'r' and edulevel = LEVEL_PARTICIPATING will
  67  *       be considered as view action.
  68  *
  69  * @return array
  70  */
  71 function page_get_view_actions() {
  72     return array('view','view all');
  73 }
  74
  75 /**
  76  * List the actions that correspond to a post of this module.
  77  * This is used by the participation report.
  78  *
  79  * Note: This is not used by new logging system. Event with
  80  *       crud = ('c' || 'u' || 'd') and edulevel = LEVEL_PARTICIPATING
  81  *       will be considered as post action.
  82  *
  83  * @return array
  84  */
  85 function page_get_post_actions() {
  86     return array('update', 'add');
  87 }
  88
  89 /**
  90  * Add page instance.
  91  * @param stdClass $data
  92  * @param mod_page_mod_form $mform
  93  * @return int new page instance id
  94  */
  95 function page_add_instance($data, $mform = null) {
  96     global $CFG, $DB;
  97     require_once("$CFG->libdir/resourcelib.php");
  98
  99     $cmid = $data->coursemodule;
 100
 101     $data->timemodified = time();
 102     $displayoptions = array();
 103     if ($data->display == RESOURCELIB_DISPLAY_POPUP) {
 104         $displayoptions['popupwidth']  = $data->popupwidth;
 105         $displayoptions['popupheight'] = $data->popupheight;
 106     }
 107     $displayoptions['printintro']   = $data->printintro;
 108     $displayoptions['printlastmodified'] = $data->printlastmodified;
 109     $data->displayoptions = serialize($displayoptions);
 110
 111     if ($mform) {
 112         $data->content       = $data->page['text'];
 113         $data->contentformat = $data->page['format'];
 114     }
 115
 116     $data->id = $DB->insert_record('page', $data);
 117
 118     // we need to use context now, so we need to make sure all needed info is already in db
 119     $DB->set_field('course_modules', 'instance', $data->id, array('id'=>$cmid));
 120     $context = context_module::instance($cmid);
 121
 122     if ($mform and !empty($data->page['itemid'])) {
 123         $draftitemid = $data->page['itemid'];
 124         $data->content = file_save_draft_area_files($draftitemid, $context->id, 'mod_page', 'content', 0, page_get_editor_options($context), $data->content);
 125         $DB->update_record('page', $data);
 126     }
 127
 128     $completiontimeexpected = !empty($data->completionexpected) ? $data->completionexpected : null;
 129     \core_completion\api::update_completion_date_event($cmid, 'page', $data->id, $completiontimeexpected);
 130
 131     return $data->id;
 132 }
 133
 134 /**
 135  * Update page instance.
 136  * @param object $data
 137  * @param object $mform
 138  * @return bool true
 139  */
 140 function page_update_instance($data, $mform) {
 141     global $CFG, $DB;
 142     require_once("$CFG->libdir/resourcelib.php");
 143
 144     $cmid        = $data->coursemodule;
 145     $draftitemid = $data->page['itemid'];
 146
 147     $data->timemodified = time();
 148     $data->id           = $data->instance;
 149     $data->revision++;
 150
 151     $displayoptions = array();
 152     if ($data->display == RESOURCELIB_DISPLAY_POPUP) {
 153         $displayoptions['popupwidth']  = $data->popupwidth;
 154         $displayoptions['popupheight'] = $data->popupheight;
 155     }
 156     $displayoptions['printintro']   = $data->printintro;
 157     $displayoptions['printlastmodified'] = $data->printlastmodified;
 158     $data->displayoptions = serialize($displayoptions);
 159
 160     $data->content       = $data->page['text'];
 161     $data->contentformat = $data->page['format'];
 162
 163     $DB->update_record('page', $data);
 164
 165     $context = context_module::instance($cmid);
 166     if ($draftitemid) {
 167         $data->content = file_save_draft_area_files($draftitemid, $context->id, 'mod_page', 'content', 0, page_get_editor_options($context), $data->content);
 168         $DB->update_record('page', $data);
 169     }
 170
 171     $completiontimeexpected = !empty($data->completionexpected) ? $data->completionexpected : null;
 172     \core_completion\api::update_completion_date_event($cmid, 'page', $data->id, $completiontimeexpected);
 173
 174     return true;
 175 }
 176
 177 /**
 178  * Delete page instance.
 179  * @param int $id
 180  * @return bool true
 181  */
 182 function page_delete_instance($id) {
 183     global $DB;
 184
 185     if (!$page = $DB->get_record('page', array('id'=>$id))) {
 186         return false;
 187     }
 188
 189     $cm = get_coursemodule_from_instance('page', $id);
 190     \core_completion\api::update_completion_date_event($cm->id, 'page', $id, null);
 191
 192     // note: all context files are deleted automatically
 193
 194     $DB->delete_records('page', array('id'=>$page->id));
 195
 196     return true;
 197 }
 198
 199 /**
 200  * Given a course_module object, this function returns any
 201  * "extra" information that may be needed when printing
 202  * this activity in a course listing.
 203  *
 204  * See {@link course_modinfo::get_array_of_activities()}
 205  *
 206  * @param stdClass $coursemodule
 207  * @return cached_cm_info Info to customise main page display
 208  */
 209 function page_get_coursemodule_info($coursemodule) {
 210     global $CFG, $DB;
 211     require_once("$CFG->libdir/resourcelib.php");
 212
 213     if (!$page = $DB->get_record('page', array('id'=>$coursemodule->instance),
 214             'id, name, display, displayoptions, intro, introformat')) {
 215         return NULL;
 216     }
 217
 218     $info = new cached_cm_info();
 219     $info->name = $page->name;
 220
 221     if ($coursemodule->showdescription) {
 222         // Convert intro to html. Do not filter cached version, filters run at display time.
 223         $info->content = format_module_intro('page', $page, $coursemodule->id, false);
 224     }
 225
 226     if ($page->display != RESOURCELIB_DISPLAY_POPUP) {
 227         return $info;
 228     }
 229
 230     $fullurl = "$CFG->wwwroot/mod/page/view.php?id=$coursemodule->id&amp;inpopup=1";
 231     $options = empty($page->displayoptions) ? [] : (array) unserialize_array($page->displayoptions);
 232     $width  = empty($options['popupwidth'])  ? 620 : $options['popupwidth'];
 233     $height = empty($options['popupheight']) ? 450 : $options['popupheight'];
 234     $wh = "width=$width,height=$height,toolbar=no,location=no,menubar=no,copyhistory=no,status=no,directories=no,scrollbars=yes,resizable=yes";
 235     $info->onclick = "window.open('$fullurl', '', '$wh'); return false;";
 236
 237     return $info;
 238 }
 239
 240
 241 /**
 242  * Lists all browsable file areas
 243  *
 244  * @package  mod_page
 245  * @category files
 246  * @param stdClass $course course object
 247  * @param stdClass $cm course module object
 248  * @param stdClass $context context object
 249  * @return array
 250  */
 251 function page_get_file_areas($course, $cm, $context) {
 252     $areas = array();
 253     $areas['content'] = get_string('content', 'page');
 254     return $areas;
 255 }
 256
 257 /**
 258  * File browsing support for page module content area.
 259  *
 260  * @package  mod_page
 261  * @category files
 262  * @param stdClass $browser file browser instance
 263  * @param stdClass $areas file areas
 264  * @param stdClass $course course object
 265  * @param stdClass $cm course module object
 266  * @param stdClass $context context object
 267  * @param string $filearea file area
 268  * @param int $itemid item ID
 269  * @param string $filepath file path
 270  * @param string $filename file name
 271  * @return file_info instance or null if not found
 272  */
 273 function page_get_file_info($browser, $areas, $course, $cm, $context, $filearea, $itemid, $filepath, $filename) {
 274     global $CFG;
 275
 276     if (!has_capability('moodle/course:managefiles', $context)) {
 277         // students can not peak here!
 278         return null;
 279     }
 280
 281     $fs = get_file_storage();
 282
 283     if ($filearea === 'content') {
 284         $filepath = is_null($filepath) ? '/' : $filepath;
 285         $filename = is_null($filename) ? '.' : $filename;
 286
 287         $urlbase = $CFG->wwwroot.'/pluginfile.php';
 288         if (!$storedfile = $fs->get_file($context->id, 'mod_page', 'content', 0, $filepath, $filename)) {
 289             if ($filepath === '/' and $filename === '.') {
 290                 $storedfile = new virtual_root_file($context->id, 'mod_page', 'content', 0);
 291             } else {
 292                 // not found
 293                 return null;
 294             }
 295         }
 296         require_once("$CFG->dirroot/mod/page/locallib.php");
 297         return new page_content_file_info($browser, $context, $storedfile, $urlbase, $areas[$filearea], true, true, true, false);
 298     }
 299
 300     // note: page_intro handled in file_browser automatically
 301
 302     return null;
 303 }
 304
 305 /**
 306  * Serves the page files.
 307  *
 308  * @package  mod_page
 309  * @category files
 310  * @param stdClass $course course object
 311  * @param stdClass $cm course module object
 312  * @param stdClass $context context object
 313  * @param string $filearea file area
 314  * @param array $args extra arguments
 315  * @param bool $forcedownload whether or not force download
 316  * @param array $options additional options affecting the file serving
 317  * @return bool false if file not found, does not return if found - just send the file
 318  */
 319 function page_pluginfile($course, $cm, $context, $filearea, $args, $forcedownload, array $options=array()) {
 320     global $CFG, $DB;
 321     require_once("$CFG->libdir/resourcelib.php");
 322
 323     if ($context->contextlevel != CONTEXT_MODULE) {
 324         return false;
 325     }
 326
 327     require_course_login($course, true, $cm);
 328     if (!has_capability('mod/page:view', $context)) {
 329         return false;
 330     }
 331
 332     if ($filearea !== 'content') {
 333         // intro is handled automatically in pluginfile.php
 334         return false;
 335     }
 336
 337     // $arg could be revision number or index.html
 338     $arg = array_shift($args);
 339     if ($arg == 'index.html' || $arg == 'index.htm') {
 340         // serve page content
 341         $filename = $arg;
 342
 343         if (!$page = $DB->get_record('page', array('id'=>$cm->instance), '*', MUST_EXIST)) {
 344             return false;
 345         }
 346
 347         // We need to rewrite the pluginfile URLs so the media filters can work.
 348         $content = file_rewrite_pluginfile_urls($page->content, 'webservice/pluginfile.php', $context->id, 'mod_page', 'content',
 349                                                 $page->revision);
 350         $formatoptions = new stdClass;
 351         $formatoptions->noclean = true;
 352         $formatoptions->overflowdiv = true;
 353         $formatoptions->context = $context;
 354         $content = format_text($content, $page->contentformat, $formatoptions);
 355
 356         // Remove @@PLUGINFILE@@/.
 357         $options = array('reverse' => true);
 358         $content = file_rewrite_pluginfile_urls($content, 'webservice/pluginfile.php', $context->id, 'mod_page', 'content',
 359                                                 $page->revision, $options);
 360         $content = str_replace('@@PLUGINFILE@@/', '', $content);
 361
 362         send_file($content, $filename, 0, 0, true, true);
 363     } else {
 364         $fs = get_file_storage();
 365         $relativepath = implode('/', $args);
 366         $fullpath = "/$context->id/mod_page/$filearea/0/$relativepath";
 367         if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
 368             $page = $DB->get_record('page', array('id'=>$cm->instance), 'id, legacyfiles', MUST_EXIST);
 369             if ($page->legacyfiles != RESOURCELIB_LEGACYFILES_ACTIVE) {
 370                 return false;
 371             }
 372             if (!$file = resourcelib_try_file_migration('/'.$relativepath, $cm->id, $cm->course, 'mod_page', 'content', 0)) {
 373                 return false;
 374             }
 375             //file migrate - update flag
 376             $page->legacyfileslast = time();
 377             $DB->update_record('page', $page);
 378         }
 379
 380         // finally send the file
 381         send_stored_file($file, null, 0, $forcedownload, $options);
 382     }
 383 }
 384
 385 /**
 386  * Return a list of page types
 387  * @param string $pagetype current page type
 388  * @param stdClass $parentcontext Block's parent context
 389  * @param stdClass $currentcontext Current context of block
 390  */
 391 function page_page_type_list($pagetype, $parentcontext, $currentcontext) {
 392     $module_pagetype = array('mod-page-*'=>get_string('page-mod-page-x', 'page'));
 393     return $module_pagetype;
 394 }
 395
 396 /**
 397  * Export page resource contents
 398  *
 399  * @return array of file content
 400  */
 401 function page_export_contents($cm, $baseurl) {
 402     global $CFG, $DB;
 403     $contents = array();
 404     $context = context_module::instance($cm->id);
 405
 406     $page = $DB->get_record('page', array('id'=>$cm->instance), '*', MUST_EXIST);
 407
 408     // page contents
 409     $fs = get_file_storage();
 410     $files = $fs->get_area_files($context->id, 'mod_page', 'content', 0, 'sortorder DESC, id ASC', false);
 411     foreach ($files as $fileinfo) {
 412         $file = array();
 413         $file['type']         = 'file';
 414         $file['filename']     = $fileinfo->get_filename();
 415         $file['filepath']     = $fileinfo->get_filepath();
 416         $file['filesize']     = $fileinfo->get_filesize();
 417         $file['fileurl']      = file_encode_url("$CFG->wwwroot/" . $baseurl, '/'.$context->id.'/mod_page/content/'.$page->revision.$fileinfo->get_filepath().$fileinfo->get_filename(), true);
 418         $file['timecreated']  = $fileinfo->get_timecreated();
 419         $file['timemodified'] = $fileinfo->get_timemodified();
 420         $file['sortorder']    = $fileinfo->get_sortorder();
 421         $file['userid']       = $fileinfo->get_userid();
 422         $file['author']       = $fileinfo->get_author();
 423         $file['license']      = $fileinfo->get_license();
 424         $file['mimetype']     = $fileinfo->get_mimetype();
 425         $file['isexternalfile'] = $fileinfo->is_external_file();
 426         if ($file['isexternalfile']) {
 427             $file['repositorytype'] = $fileinfo->get_repository_type();
 428         }
 429         $contents[] = $file;
 430     }
 431
 432     // page html conent
 433     $filename = 'index.html';
 434     $pagefile = array();
 435     $pagefile['type']         = 'file';
 436     $pagefile['filename']     = $filename;
 437     $pagefile['filepath']     = '/';
 438     $pagefile['filesize']     = 0;
 439     $pagefile['fileurl']      = file_encode_url("$CFG->wwwroot/" . $baseurl, '/'.$context->id.'/mod_page/content/' . $filename, true);
 440     $pagefile['timecreated']  = null;
 441     $pagefile['timemodified'] = $page->timemodified;
 442     // make this file as main file
 443     $pagefile['sortorder']    = 1;
 444     $pagefile['userid']       = null;
 445     $pagefile['author']       = null;
 446     $pagefile['license']      = null;
 447     $contents[] = $pagefile;
 448
 449     return $contents;
 450 }
 451
 452 /**
 453  * Register the ability to handle drag and drop file uploads
 454  * @return array containing details of the files / types the mod can handle
 455  */
 456 function page_dndupload_register() {
 457     return array('types' => array(
 458                      array('identifier' => 'text/html', 'message' => get_string('createpage', 'page')),
 459                      array('identifier' => 'text', 'message' => get_string('createpage', 'page'))
 460                  ));
 461 }
 462
 463 /**
 464  * Handle a file that has been uploaded
 465  * @param object $uploadinfo details of the file / content that has been uploaded
 466  * @return int instance id of the newly created mod
 467  */
 468 function page_dndupload_handle($uploadinfo) {
 469     // Gather the required info.
 470     $data = new stdClass();
 471     $data->course = $uploadinfo->course->id;
 472     $data->name = $uploadinfo->displayname;
 473     $data->intro = '<p>'.$uploadinfo->displayname.'</p>';
 474     $data->introformat = FORMAT_HTML;
 475     if ($uploadinfo->type == 'text/html') {
 476         $data->contentformat = FORMAT_HTML;
 477         $data->content = clean_param($uploadinfo->content, PARAM_CLEANHTML);
 478     } else {
 479         $data->contentformat = FORMAT_PLAIN;
 480         $data->content = clean_param($uploadinfo->content, PARAM_TEXT);
 481     }
 482     $data->coursemodule = $uploadinfo->coursemodule;
 483
 484     // Set the display options to the site defaults.
 485     $config = get_config('page');
 486     $data->display = $config->display;
 487     $data->popupheight = $config->popupheight;
 488     $data->popupwidth = $config->popupwidth;
 489     $data->printintro = $config->printintro;
 490     $data->printlastmodified = $config->printlastmodified;
 491
 492     return page_add_instance($data, null);
 493 }
 494
 495 /**
 496  * Mark the activity completed (if required) and trigger the course_module_viewed event.
 497  *
 498  * @param  stdClass $page       page object
 499  * @param  stdClass $course     course object
 500  * @param  stdClass $cm         course module object
 501  * @param  stdClass $context    context object
 502  * @since Moodle 3.0
 503  */
 504 function page_view($page, $course, $cm, $context) {
 505
 506     // Trigger course_module_viewed event.
 507     $params = array(
 508         'context' => $context,
 509         'objectid' => $page->id
 510     );
 511
 512     $event = \mod_page\event\course_module_viewed::create($params);
 513     $event->add_record_snapshot('course_modules', $cm);
 514     $event->add_record_snapshot('course', $course);
 515     $event->add_record_snapshot('page', $page);
 516     $event->trigger();
 517
 518     // Completion.
 519     $completion = new completion_info($course);
 520     $completion->set_module_viewed($cm);
 521 }
 522
 523 /**
 524  * Check if the module has any update that affects the current user since a given time.
 525  *
 526  * @param  cm_info $cm course module data
 527  * @param  int $from the time to check updates from
 528  * @param  array $filter  if we need to check only specific updates
 529  * @return stdClass an object with the different type of areas indicating if they were updated or not
 530  * @since Moodle 3.2
 531  */
 532 function page_check_updates_since(cm_info $cm, $from, $filter = array()) {
 533     $updates = course_check_module_updates_since($cm, $from, array('content'), $filter);
 534     return $updates;
 535 }
 536
 537 /**
 538  * This function receives a calendar event and returns the action associated with it, or null if there is none.
 539  *
 540  * This is used by block_myoverview in order to display the event appropriately. If null is returned then the event
 541  * is not displayed on the block.
 542  *
 543  * @param calendar_event $event
 544  * @param \core_calendar\action_factory $factory
 545  * @return \core_calendar\local\event\entities\action_interface|null
 546  */
 547 function mod_page_core_calendar_provide_event_action(calendar_event $event,
 548                                                       \core_calendar\action_factory $factory, $userid = 0) {
 549     global $USER;
 550
 551     if (empty($userid)) {
 552         $userid = $USER->id;
 553     }
 554
 555     $cm = get_fast_modinfo($event->courseid, $userid)->instances['page'][$event->instance];
 556
 557     $completion = new \completion_info($cm->get_course());
 558
 559     $completiondata = $completion->get_data($cm, false, $userid);
 560
 561     if ($completiondata->completionstate != COMPLETION_INCOMPLETE) {
 562         return null;
 563     }
 564
 565     return $factory->create_instance(
 566         get_string('view'),
 567         new \moodle_url('/mod/page/view.php', ['id' => $cm->id]),
 568         1,
 569         true
 570     );
 571 }
 572
 573 /**
 574  * Given an array with a file path, it returns the itemid and the filepath for the defined filearea.
 575  *
 576  * @param  string $filearea The filearea.
 577  * @param  array  $args The path (the part after the filearea and before the filename).
 578  * @return array The itemid and the filepath inside the $args path, for the defined filearea.
 579  */
 580 function mod_page_get_path_from_pluginfile(string $filearea, array $args) : array {
 581     // Page never has an itemid (the number represents the revision but it's not stored in database).
 582     array_shift($args);
 583
 584     // Get the filepath.
 585     if (empty($args)) {
 586         $filepath = '/';
 587     } else {
 588         $filepath = '/' . implode('/', $args) . '/';
 589     }
 590
 591     return [
 592         'itemid' => 0,
 593         'filepath' => $filepath,
 594     ];
 595 }