mod/imscp/lib.php

   1 <?php
   2 // This file is part of Moodle - http://moodle.org/
   3 //
   4 // Moodle is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU General Public License as published by
   6 // the Free Software Foundation, either version 3 of the License, or
   7 // (at your option) any later version.
   8 //
   9 // Moodle is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 /**
  18  * Mandatory public API of imscp module
  19  *
  20  * @package mod_imscp
  21  * @copyright  2009 Petr Skoda  {@link http://skodak.org}
  22  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23  */
  24
  25 defined('MOODLE_INTERNAL') || die();
  26
  27 /**
  28  * List of features supported in IMS CP module
  29  * @param string $feature FEATURE_xx constant for requested feature
  30  * @return mixed True if module supports feature, false if not, null if doesn't know or string for the module purpose.
  31  */
  32 function imscp_supports($feature) {
  33     switch($feature) {
  34         case FEATURE_MOD_ARCHETYPE:           return MOD_ARCHETYPE_RESOURCE;
  35         case FEATURE_GROUPS:                  return false;
  36         case FEATURE_GROUPINGS:               return false;
  37         case FEATURE_MOD_INTRO:               return true;
  38         case FEATURE_COMPLETION_TRACKS_VIEWS: return true;
  39         case FEATURE_GRADE_HAS_GRADE:         return false;
  40         case FEATURE_GRADE_OUTCOMES:          return false;
  41         case FEATURE_BACKUP_MOODLE2:          return true;
  42         case FEATURE_SHOW_DESCRIPTION:        return true;
  43         case FEATURE_MOD_PURPOSE:             return MOD_PURPOSE_CONTENT;
  44
  45         default: return null;
  46     }
  47 }
  48
  49 /**
  50  * This function is used by the reset_course_userdata function in moodlelib.
  51  *
  52  * @param stdClass $data the data submitted from the reset course.
  53  * @return array status array
  54  */
  55 function imscp_reset_userdata($data) {
  56
  57     // Any changes to the list of dates that needs to be rolled should be same during course restore and course reset.
  58     // See MDL-9367.
  59
  60     return array();
  61 }
  62
  63 /**
  64  * List the actions that correspond to a view of this module.
  65  * This is used by the participation report.
  66  *
  67  * Note: This is not used by new logging system. Event with
  68  *       crud = 'r' and edulevel = LEVEL_PARTICIPATING will
  69  *       be considered as view action.
  70  *
  71  * @return array
  72  */
  73 function imscp_get_view_actions() {
  74     return array('view', 'view all');
  75 }
  76
  77 /**
  78  * List the actions that correspond to a post of this module.
  79  * This is used by the participation report.
  80  *
  81  * Note: This is not used by new logging system. Event with
  82  *       crud = ('c' || 'u' || 'd') and edulevel = LEVEL_PARTICIPATING
  83  *       will be considered as post action.
  84  *
  85  * @return array
  86  */
  87 function imscp_get_post_actions() {
  88     return array('update', 'add');
  89 }
  90
  91 /**
  92  * Add imscp instance.
  93  * @param object $data
  94  * @param object $mform
  95  * @return int new imscp instance id
  96  */
  97 function imscp_add_instance($data, $mform) {
  98     global $CFG, $DB;
  99     require_once("$CFG->dirroot/mod/imscp/locallib.php");
 100
 101     $cmid = $data->coursemodule;
 102
 103     $data->timemodified = time();
 104     $data->revision     = 1;
 105     $data->structure    = null;
 106
 107     $data->id = $DB->insert_record('imscp', $data);
 108
 109     // We need to use context now, so we need to make sure all needed info is already in db.
 110     $DB->set_field('course_modules', 'instance', $data->id, array('id' => $cmid));
 111     $context = context_module::instance($cmid);
 112     $imscp = $DB->get_record('imscp', array('id' => $data->id), '*', MUST_EXIST);
 113
 114     if (!empty($data->package)) {
 115         // Save uploaded files to 'backup' filearea.
 116         $fs = get_file_storage();
 117         $fs->delete_area_files($context->id, 'mod_imscp', 'backup', 1);
 118         file_save_draft_area_files($data->package, $context->id, 'mod_imscp', 'backup',
 119             1, array('subdirs' => 0, 'maxfiles' => 1));
 120         // Get filename of zip that was uploaded.
 121         $files = $fs->get_area_files($context->id, 'mod_imscp', 'backup', 1, '', false);
 122         if ($files) {
 123             // Extract package content to 'content' filearea.
 124             $package = reset($files);
 125             $packer = get_file_packer('application/zip');
 126             $package->extract_to_storage($packer, $context->id, 'mod_imscp', 'content', 1, '/');
 127             $structure = imscp_parse_structure($imscp, $context);
 128             $imscp->structure = is_array($structure) ? serialize($structure) : null;
 129             $DB->update_record('imscp', $imscp);
 130         }
 131     }
 132
 133     $completiontimeexpected = !empty($data->completionexpected) ? $data->completionexpected : null;
 134     \core_completion\api::update_completion_date_event($cmid, 'imscp', $data->id, $completiontimeexpected);
 135
 136     return $data->id;
 137 }
 138
 139 /**
 140  * Update imscp instance.
 141  * @param object $data
 142  * @param object $mform
 143  * @return bool true
 144  */
 145 function imscp_update_instance($data, $mform) {
 146     global $CFG, $DB;
 147     require_once("$CFG->dirroot/mod/imscp/locallib.php");
 148
 149     $cmid = $data->coursemodule;
 150
 151     $data->timemodified = time();
 152     $data->id           = $data->instance;
 153     $data->structure   = null; // Better reparse structure after each update.
 154
 155     $DB->update_record('imscp', $data);
 156
 157     $context = context_module::instance($cmid);
 158     $imscp = $DB->get_record('imscp', array('id' => $data->id), '*', MUST_EXIST);
 159
 160     if (!empty($data->package) && ($draftareainfo = file_get_draft_area_info($data->package)) &&
 161             $draftareainfo['filecount']) {
 162         $fs = get_file_storage();
 163
 164         $imscp->revision++;
 165         $DB->update_record('imscp', $imscp);
 166
 167         // Get a list of existing packages before adding new package.
 168         if ($imscp->keepold > -1) {
 169             $packages = $fs->get_area_files($context->id, 'mod_imscp', 'backup', false, "itemid ASC", false);
 170         } else {
 171             $packages = array();
 172         }
 173
 174         file_save_draft_area_files($data->package, $context->id, 'mod_imscp', 'backup',
 175             $imscp->revision, array('subdirs' => 0, 'maxfiles' => 1));
 176         $files = $fs->get_area_files($context->id, 'mod_imscp', 'backup', $imscp->revision, '', false);
 177         $package = reset($files);
 178
 179         // Purge all extracted content.
 180         $fs->delete_area_files($context->id, 'mod_imscp', 'content');
 181
 182         // Extract package content.
 183         if ($package) {
 184             $packer = get_file_packer('application/zip');
 185             $package->extract_to_storage($packer, $context->id, 'mod_imscp', 'content', $imscp->revision, '/');
 186         }
 187
 188         // Cleanup old package files, keep current + keep old.
 189         while ($packages and (count($packages) > $imscp->keepold)) {
 190             $package = array_shift($packages);
 191             $fs->delete_area_files($context->id, 'mod_imscp', 'backup', $package->get_itemid());
 192         }
 193     }
 194
 195     $structure = imscp_parse_structure($imscp, $context);
 196     $imscp->structure = is_array($structure) ? serialize($structure) : null;
 197     $DB->update_record('imscp', $imscp);
 198
 199     $completiontimeexpected = !empty($data->completionexpected) ? $data->completionexpected : null;
 200     \core_completion\api::update_completion_date_event($cmid, 'imscp', $imscp->id, $completiontimeexpected);
 201
 202     return true;
 203 }
 204
 205 /**
 206  * Delete imscp instance.
 207  * @param int $id
 208  * @return bool true
 209  */
 210 function imscp_delete_instance($id) {
 211     global $DB;
 212
 213     if (!$imscp = $DB->get_record('imscp', array('id' => $id))) {
 214         return false;
 215     }
 216
 217     $cm = get_coursemodule_from_instance('imscp', $id);
 218     \core_completion\api::update_completion_date_event($cm->id, 'imscp', $id, null);
 219
 220     // Note: all context files are deleted automatically.
 221
 222     $DB->delete_records('imscp', array('id' => $imscp->id));
 223
 224     return true;
 225 }
 226
 227 /**
 228  * Lists all browsable file areas
 229  *
 230  * @package  mod_imscp
 231  * @category files
 232  * @param stdClass $course course object
 233  * @param stdClass $cm course module object
 234  * @param stdClass $context context object
 235  * @return array
 236  */
 237 function imscp_get_file_areas($course, $cm, $context) {
 238     $areas = array();
 239
 240     $areas['content'] = get_string('areacontent', 'imscp');
 241     $areas['backup']  = get_string('areabackup', 'imscp');
 242
 243     return $areas;
 244 }
 245
 246 /**
 247  * File browsing support for imscp module ontent area.
 248  *
 249  * @package  mod_imscp
 250  * @category files
 251  * @param file_browser $browser file browser
 252  * @param stdClass $areas file areas
 253  * @param stdClass $course course object
 254  * @param stdClass $cm course module object
 255  * @param stdClass $context context object
 256  * @param string $filearea file area
 257  * @param int $itemid item ID
 258  * @param string $filepath file path
 259  * @param string $filename file name
 260  * @return file_info instance or null if not found
 261  */
 262 function imscp_get_file_info($browser, $areas, $course, $cm, $context, $filearea, $itemid, $filepath, $filename) {
 263     global $CFG, $DB;
 264
 265     // Note: imscp_intro handled in file_browser automatically.
 266
 267     if (!has_capability('moodle/course:managefiles', $context)) {
 268         // No peeking here for students!
 269         return null;
 270     }
 271
 272     if ($filearea !== 'content' and $filearea !== 'backup') {
 273         return null;
 274     }
 275
 276     require_once("$CFG->dirroot/mod/imscp/locallib.php");
 277
 278     if (is_null($itemid)) {
 279         return new imscp_file_info($browser, $course, $cm, $context, $areas, $filearea, $itemid);
 280     }
 281
 282     $fs = get_file_storage();
 283     $filepath = is_null($filepath) ? '/' : $filepath;
 284     $filename = is_null($filename) ? '.' : $filename;
 285     if (!$storedfile = $fs->get_file($context->id, 'mod_imscp', $filearea, $itemid, $filepath, $filename)) {
 286         return null;
 287     }
 288
 289     // Do not allow manual modification of any files!
 290     $urlbase = $CFG->wwwroot.'/pluginfile.php';
 291     return new file_info_stored($browser, $context, $storedfile, $urlbase, $itemid, true, true, false, false); // No writing here!
 292 }
 293
 294 /**
 295  * Serves the imscp files.
 296  *
 297  * @package  mod_imscp
 298  * @category files
 299  * @param stdClass $course course object
 300  * @param stdClass $cm course module object
 301  * @param stdClass $context context object
 302  * @param string $filearea file area
 303  * @param array $args extra arguments
 304  * @param bool $forcedownload whether or not force download
 305  * @param array $options additional options affecting the file serving
 306  * @return bool false if file not found, does not return if found - justsend the file
 307  */
 308 function imscp_pluginfile($course, $cm, $context, $filearea, $args, $forcedownload, array $options=array()) {
 309     global $CFG, $DB;
 310
 311     if ($context->contextlevel != CONTEXT_MODULE) {
 312         return false;
 313     }
 314
 315     require_login($course, true, $cm);
 316
 317     if ($filearea === 'content') {
 318         if (!has_capability('mod/imscp:view', $context)) {
 319             return false;
 320         }
 321         $revision = array_shift($args);
 322         $fs = get_file_storage();
 323         $relativepath = implode('/', $args);
 324         if ($relativepath === 'imsmanifest.xml') {
 325             if (!has_capability('moodle/course:managefiles', $context)) {
 326                 // No stealing of detailed package info.
 327                 return false;
 328             }
 329         }
 330         $fullpath = "/$context->id/mod_imscp/$filearea/$revision/$relativepath";
 331         if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
 332             return false;
 333         }
 334
 335         // Finally send the file.
 336         send_stored_file($file, null, 0, $forcedownload, $options);
 337
 338     } else if ($filearea === 'backup') {
 339         if (!has_capability('moodle/course:managefiles', $context)) {
 340             // No stealing of package backups.
 341             return false;
 342         }
 343         $revision = array_shift($args);
 344         $fs = get_file_storage();
 345         $relativepath = implode('/', $args);
 346         $fullpath = "/$context->id/mod_imscp/$filearea/$revision/$relativepath";
 347         if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
 348             return false;
 349         }
 350
 351         // Finally send the file.
 352         send_stored_file($file, null, 0, $forcedownload, $options);
 353
 354     } else {
 355         return false;
 356     }
 357 }
 358
 359 /**
 360  * Return a list of page types
 361  * @param string $pagetype current page type
 362  * @param stdClass $parentcontext Block's parent context
 363  * @param stdClass $currentcontext Current context of block
 364  * @return array $modulepagetype list
 365  */
 366 function imscp_page_type_list($pagetype, $parentcontext, $currentcontext) {
 367     $modulepagetype = array('mod-imscp-*' => get_string('page-mod-imscp-x', 'imscp'));
 368     return $modulepagetype;
 369 }
 370
 371 /**
 372  * Export imscp resource contents
 373  *
 374  * @param  stdClass $cm     Course module object
 375  * @param  string $baseurl  Base URL for file downloads
 376  * @return array of file content
 377  */
 378 function imscp_export_contents($cm, $baseurl) {
 379     global $DB;
 380
 381     $contents = array();
 382     $context = context_module::instance($cm->id);
 383
 384     $imscp = $DB->get_record('imscp', array('id' => $cm->instance), '*', MUST_EXIST);
 385
 386     // We export the IMSCP structure as json encoded string.
 387     $structure = array();
 388     $structure['type']         = 'content';
 389     $structure['filename']     = 'structure';
 390     $structure['filepath']     = '/';
 391     $structure['filesize']     = 0;
 392     $structure['fileurl']      = null;
 393     $structure['timecreated']  = $imscp->timemodified;
 394     $structure['timemodified'] = $imscp->timemodified;
 395     $structure['content']      = json_encode(unserialize($imscp->structure));
 396     $structure['sortorder']    = 0;
 397     $structure['userid']       = null;
 398     $structure['author']       = null;
 399     $structure['license']      = null;
 400     $contents[] = $structure;
 401
 402     // Area files.
 403     $fs = get_file_storage();
 404     $files = $fs->get_area_files($context->id, 'mod_imscp', 'content', $imscp->revision, 'id ASC', false);
 405     foreach ($files as $fileinfo) {
 406         $file = array();
 407         $file['type']         = 'file';
 408         $file['filename']     = $fileinfo->get_filename();
 409         $file['filepath']     = $fileinfo->get_filepath();
 410         $file['filesize']     = $fileinfo->get_filesize();
 411         $file['fileurl']      = moodle_url::make_webservice_pluginfile_url(
 412                                     $context->id, 'mod_imscp', 'content', $imscp->revision,
 413                                     $fileinfo->get_filepath(), $fileinfo->get_filename())->out(false);
 414         $file['timecreated']  = $fileinfo->get_timecreated();
 415         $file['timemodified'] = $fileinfo->get_timemodified();
 416         $file['sortorder']    = $fileinfo->get_sortorder();
 417         $file['userid']       = $fileinfo->get_userid();
 418         $file['author']       = $fileinfo->get_author();
 419         $file['license']      = $fileinfo->get_license();
 420         $file['mimetype']     = $fileinfo->get_mimetype();
 421         $file['isexternalfile'] = $fileinfo->is_external_file();
 422         if ($file['isexternalfile']) {
 423             $file['repositorytype'] = $fileinfo->get_repository_type();
 424         }
 425         $contents[] = $file;
 426     }
 427
 428     return $contents;
 429 }
 430
 431 /**
 432  * Mark the activity completed (if required) and trigger the course_module_viewed event.
 433  *
 434  * @param  stdClass $imscp   imscp object
 435  * @param  stdClass $course     course object
 436  * @param  stdClass $cm         course module object
 437  * @param  stdClass $context    context object
 438  * @since Moodle 3.0
 439  */
 440 function imscp_view($imscp, $course, $cm, $context) {
 441
 442     // Trigger course_module_viewed event.
 443     $params = array(
 444         'context' => $context,
 445         'objectid' => $imscp->id
 446     );
 447
 448     $event = \mod_imscp\event\course_module_viewed::create($params);
 449     $event->add_record_snapshot('course_modules', $cm);
 450     $event->add_record_snapshot('course', $course);
 451     $event->add_record_snapshot('imscp', $imscp);
 452     $event->trigger();
 453
 454     // Completion.
 455     $completion = new completion_info($course);
 456     $completion->set_module_viewed($cm);
 457 }
 458
 459 /**
 460  * Check if the module has any update that affects the current user since a given time.
 461  *
 462  * @param  cm_info $cm course module data
 463  * @param  int $from the time to check updates from
 464  * @param  array $filter  if we need to check only specific updates
 465  * @return stdClass an object with the different type of areas indicating if they were updated or not
 466  * @since Moodle 3.2
 467  */
 468 function imscp_check_updates_since(cm_info $cm, $from, $filter = array()) {
 469     $updates = course_check_module_updates_since($cm, $from, array('content'), $filter);
 470     return $updates;
 471 }
 472
 473 /**
 474  * This function receives a calendar event and returns the action associated with it, or null if there is none.
 475  *
 476  * This is used by block_myoverview in order to display the event appropriately. If null is returned then the event
 477  * is not displayed on the block.
 478  *
 479  * @param calendar_event $event
 480  * @param \core_calendar\action_factory $factory
 481  * @param int $userid User id to use for all capability checks, etc. Set to 0 for current user (default).
 482  * @return \core_calendar\local\event\entities\action_interface|null
 483  */
 484 function mod_imscp_core_calendar_provide_event_action(calendar_event $event,
 485                                                       \core_calendar\action_factory $factory,
 486                                                       int $userid = 0) {
 487     $cm = get_fast_modinfo($event->courseid, $userid)->instances['imscp'][$event->instance];
 488
 489     if (!$cm->uservisible) {
 490         // The module is not visible to the user for any reason.
 491         return null;
 492     }
 493
 494     $completion = new \completion_info($cm->get_course());
 495
 496     $completiondata = $completion->get_data($cm, false, $userid);
 497
 498     if ($completiondata->completionstate != COMPLETION_INCOMPLETE) {
 499         return null;
 500     }
 501
 502     return $factory->create_instance(
 503         get_string('view'),
 504         new \moodle_url('/mod/imscp/view.php', ['id' => $cm->id]),
 505         1,
 506         true
 507     );
 508 }