pluginfile.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 script delegates file serving to individual plugins
  20  *
  21  * @package    core
  22  * @subpackage file
  23  * @copyright  2008 Petr Skoda (http://skodak.org)
  24  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  25  */
  26
  27 // disable moodle specific debug messages and any errors in output
  28 //define('NO_DEBUG_DISPLAY', true);
  29 //TODO: uncomment this once the file api stabilises a bit more
  30
  31 require_once('config.php');
  32 require_once('lib/filelib.php');
  33
  34 $relativepath = get_file_argument();
  35 $forcedownload = optional_param('forcedownload', 0, PARAM_BOOL);
  36
  37 // relative path must start with '/'
  38 if (!$relativepath) {
  39     print_error('invalidargorconf');
  40 } else if ($relativepath[0] != '/') {
  41     print_error('pathdoesnotstartslash');
  42 }
  43
  44 // extract relative path components
  45 $args = explode('/', ltrim($relativepath, '/'));
  46
  47 if (count($args) < 3) { // always at least context, component and filearea
  48     print_error('invalidarguments');
  49 }
  50
  51 $contextid = (int)array_shift($args);
  52 $component = clean_param(array_shift($args), PARAM_SAFEDIR);
  53 $filearea  = clean_param(array_shift($args), PARAM_SAFEDIR);
  54
  55 list($context, $course, $cm) = get_context_info_array($contextid);
  56
  57 $fs = get_file_storage();
  58
  59 // If the file is a Flash file and that the user flash player is outdated return a flash upgrader MDL-20841
  60 $mimetype = mimeinfo('type', $args[count($args)-1]);
  61 if (!empty($CFG->excludeoldflashclients) && $mimetype == 'application/x-shockwave-flash'&& !empty($SESSION->flashversion)) {
  62     $userplayerversion = explode('.', $SESSION->flashversion);
  63     $requiredplayerversion = explode('.', $CFG->excludeoldflashclients);
  64     if (($userplayerversion[0] <  $requiredplayerversion[0]) ||
  65         ($userplayerversion[0] == $requiredplayerversion[0] && $userplayerversion[1] < $requiredplayerversion[1]) ||
  66         ($userplayerversion[0] == $requiredplayerversion[0] && $userplayerversion[1] == $requiredplayerversion[1]
  67          && $userplayerversion[2] < $requiredplayerversion[2])) {
  68         $path = $CFG->dirroot."/lib/flashdetect/flashupgrade.swf";  // Alternate content asking user to upgrade Flash
  69         $filename = "flashupgrade.swf";
  70         send_file($path, $filename, O, 0, false, false, 'application/x-shockwave-flash'); // Do not cache
  71     }
  72 }
  73
  74 // ========================================================================================================================
  75 if ($component === 'blog') {
  76     // Blog file serving
  77     if ($context->contextlevel != CONTEXT_SYSTEM) {
  78         send_file_not_found();
  79     }
  80     if ($filearea !== 'attachment' and $filearea !== 'post') {
  81         send_file_not_found();
  82     }
  83
  84     if (empty($CFG->bloglevel)) {
  85         print_error('siteblogdisable', 'blog');
  86     }
  87
  88     if ($CFG->bloglevel < BLOG_GLOBAL_LEVEL) {
  89         require_login();
  90         if (isguestuser()) {
  91             print_error('noguest');
  92         }
  93         if ($CFG->bloglevel == BLOG_USER_LEVEL) {
  94             if ($USER->id != $entry->userid) {
  95                 send_file_not_found();
  96             }
  97         }
  98     }
  99     $entryid = (int)array_shift($args);
 100     if (!$entry = $DB->get_record('post', array('module'=>'blog', 'id'=>$entryid))) {
 101         send_file_not_found();
 102     }
 103
 104     if ('publishstate' === 'public') {
 105         if ($CFG->forcelogin) {
 106             require_login();
 107         }
 108
 109     } else if ('publishstate' === 'site') {
 110         require_login();
 111         //ok
 112     } else if ('publishstate' === 'draft') {
 113         require_login();
 114         if ($USER->id != $entry->userid) {
 115             send_file_not_found();
 116         }
 117     }
 118
 119     $filename = array_pop($args);
 120     $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 121
 122     if (!$file = $fs->get_file($context->id, $component, $filearea, $entryid, $filepath, $filename) or $file->is_directory()) {
 123         send_file_not_found();
 124     }
 125
 126     send_stored_file($file, 10*60, 0, true); // download MUST be forced - security!
 127
 128 // ========================================================================================================================
 129 } else if ($component === 'grade') {
 130     if (($filearea === 'outcome' or $filearea === 'scale') and $context->contextlevel == CONTEXT_SYSTEM) {
 131         // Global gradebook files
 132         if ($CFG->forcelogin) {
 133             require_login();
 134         }
 135
 136         $fullpath = "/$context->id/$component/$filearea/".implode('/', $args);
 137
 138         if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
 139             send_file_not_found();
 140         }
 141
 142         session_get_instance()->write_close(); // unlock session during fileserving
 143         send_stored_file($file, 60*60, 0, $forcedownload);
 144
 145     } else if ($filearea === 'feedback' and $context->contextlevel == CONTEXT_COURSE) {
 146         //TODO: nobody implemented this yet in grade edit form!!
 147         send_file_not_found();
 148
 149         if ($CFG->forcelogin || $course->id != SITEID) {
 150             require_login($course);
 151         }
 152
 153         $fullpath = "/$context->id/$component/$filearea/".implode('/', $args);
 154
 155         if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
 156             send_file_not_found();
 157         }
 158
 159         session_get_instance()->write_close(); // unlock session during fileserving
 160         send_stored_file($file, 60*60, 0, $forcedownload);
 161     } else {
 162         send_file_not_found();
 163     }
 164
 165 // ========================================================================================================================
 166 } else if ($component === 'tag') {
 167     if ($filearea === 'description' and $context->contextlevel == CONTEXT_SYSTEM) {
 168
 169         // All tag descriptions are going to be public but we still need to respect forcelogin
 170         if ($CFG->forcelogin) {
 171             require_login();
 172         }
 173
 174         $fullpath = "/$context->id/tag/description/".implode('/', $args);
 175
 176         if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
 177             send_file_not_found();
 178         }
 179
 180         session_get_instance()->write_close(); // unlock session during fileserving
 181         send_stored_file($file, 60*60, 0, true);
 182
 183     } else {
 184         send_file_not_found();
 185     }
 186
 187 // ========================================================================================================================
 188 } else if ($component === 'calendar') {
 189     if ($filearea === 'event_description'  and $context->contextlevel == CONTEXT_SYSTEM) {
 190
 191         // All events here are public the one requirement is that we respect forcelogin
 192         if ($CFG->forcelogin) {
 193             require_login();
 194         }
 195
 196         // Get the event if from the args array
 197         $eventid = array_shift($args);
 198
 199         // Load the event from the database
 200         if (!$event = $DB->get_record('event', array('id'=>(int)$eventid, 'eventtype'=>'site'))) {
 201             send_file_not_found();
 202         }
 203         // Check that we got an event and that it's userid is that of the user
 204
 205         // Get the file and serve if successful
 206         $filename = array_pop($args);
 207         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 208         if (!$file = $fs->get_file($context->id, $component, $filearea, $eventid, $filepath, $filename) or $file->is_directory()) {
 209             send_file_not_found();
 210         }
 211
 212         session_get_instance()->write_close(); // unlock session during fileserving
 213         send_stored_file($file, 60*60, 0, $forcedownload);
 214
 215     } else if ($filearea === 'event_description' and $context->contextlevel == CONTEXT_USER) {
 216
 217         // Must be logged in, if they are not then they obviously can't be this user
 218         require_login();
 219
 220         // Don't want guests here, potentially saves a DB call
 221         if (isguestuser()) {
 222             send_file_not_found();
 223         }
 224
 225         // Get the event if from the args array
 226         $eventid = array_shift($args);
 227
 228         // Load the event from the database - user id must match
 229         if (!$event = $DB->get_record('event', array('id'=>(int)$eventid, 'userid'=>$USER->id, 'eventtype'=>'user'))) {
 230             send_file_not_found();
 231         }
 232
 233         // Get the file and serve if successful
 234         $filename = array_pop($args);
 235         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 236         if (!$file = $fs->get_file($context->id, $component, $filearea, $eventid, $filepath, $filename) or $file->is_directory()) {
 237             send_file_not_found();
 238         }
 239
 240         session_get_instance()->write_close(); // unlock session during fileserving
 241         send_stored_file($file, 60*60, 0, $forcedownload);
 242
 243     } else if ($filearea === 'event_description' and $context->contextlevel == CONTEXT_COURSE) {
 244
 245         // Respect forcelogin and require login unless this is the site.... it probably
 246         // should NEVER be the site
 247         if ($CFG->forcelogin || $course->id != SITEID) {
 248             require_login($course);
 249         }
 250
 251         // Must be able to at least view the course
 252         if (!is_enrolled($context) and !is_viewing($context)) {
 253             //TODO: hmm, do we really want to block guests here?
 254             send_file_not_found();
 255         }
 256
 257         // Get the event id
 258         $eventid = array_shift($args);
 259
 260         // Load the event from the database we need to check whether it is
 261         // a) valid course event
 262         // b) a group event
 263         // Group events use the course context (there is no group context)
 264         if (!$event = $DB->get_record('event', array('id'=>(int)$eventid, 'courseid'=>$course->id))) {
 265             send_file_not_found();
 266         }
 267
 268         // If its a group event require either membership of view all groups capability
 269         if ($event->eventtype === 'group') {
 270             if (!has_capability('moodle/site:accessallgroups', $context) && !groups_is_member($event->groupid, $USER->id)) {
 271                 send_file_not_found();
 272             }
 273         } else if ($event->eventtype === 'course') {
 274             //ok
 275         } else {
 276             // some other type
 277             send_file_not_found();
 278         }
 279
 280         // If we get this far we can serve the file
 281         $filename = array_pop($args);
 282         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 283         if (!$file = $fs->get_file($context->id, $component, $filearea, $eventid, $filepath, $filename) or $file->is_directory()) {
 284             send_file_not_found();
 285         }
 286
 287         session_get_instance()->write_close(); // unlock session during fileserving
 288         send_stored_file($file, 60*60, 0, $forcedownload);
 289
 290     } else {
 291         send_file_not_found();
 292     }
 293
 294 // ========================================================================================================================
 295 } else if ($component === 'user') {
 296     if ($filearea === 'icon' and $context->contextlevel == CONTEXT_USER) {
 297         if (!empty($CFG->forcelogin) and !isloggedin()) {
 298             // protect images if login required and not logged in;
 299             // do not use require_login() because it is expensive and not suitable here anyway
 300             redirect($OUTPUT->pix_url('u/f1'));
 301         }
 302         $filename = array_pop($args);
 303         if ($filename !== 'f1' and $filename !== 'f2') {
 304             redirect($OUTPUT->pix_url('u/f1'));
 305         }
 306         if (!$file = $fs->get_file($context->id, 'user', 'icon', 0, '/', $filename.'/.png')) {
 307             if (!$file = $fs->get_file($context->id, 'user', 'icon', 0, '/', $filename.'/.jpg')) {
 308                 redirect($OUTPUT->pix_url('u/f1'));
 309             }
 310         }
 311
 312         send_stored_file($file, 60*60*24); // enable long caching, there are many images on each page
 313
 314     } else if ($filearea === 'private' and $context->contextlevel == CONTEXT_USER) {
 315         require_login();
 316
 317         if (isguestuser()) {
 318             send_file_not_found();
 319         }
 320
 321         if ($USER->id !== $context->instanceid) {
 322             send_file_not_found();
 323         }
 324
 325         $filename = array_pop($args);
 326         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 327         if (!$file = $fs->get_file($context->id, $component, $filearea, 0, $filepath, $filename) or $file->is_directory()) {
 328             send_file_not_found();
 329         }
 330
 331         session_get_instance()->write_close(); // unlock session during fileserving
 332         send_stored_file($file, 0, 0, true); // must force download - security!
 333
 334     } else if ($filearea === 'profile' and $context->contextlevel == CONTEXT_USER) {
 335
 336         if ($CFG->forcelogin) {
 337             require_login();
 338         }
 339
 340         $userid = $context->instanceid;
 341
 342         if ($USER->id == $userid) {
 343             // always can access own
 344
 345         } else if (!empty($CFG->forceloginforprofiles)) {
 346             require_login();
 347
 348             if (isguestuser()) {
 349                 send_file_not_found();
 350             }
 351
 352             // we allow access to site profile of all course contacts (usually teachers)
 353             if (!has_coursecontact_role($userid) && !has_capability('moodle/user:viewdetails', $context)) {
 354                 send_file_not_found();
 355             }
 356
 357             $canview = false;
 358             if (has_capability('moodle/user:viewdetails', $context)) {
 359                 $canview = true;
 360             } else {
 361                 $courses = enrol_get_my_courses();
 362             }
 363
 364             while (!$canview && count($courses) > 0) {
 365                 $course = array_shift($courses);
 366                 if (has_capability('moodle/user:viewdetails', get_context_instance(CONTEXT_COURSE, $course->id))) {
 367                     $canview = true;
 368                 }
 369             }
 370         }
 371
 372         $filename = array_pop($args);
 373         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 374         if (!$file = $fs->get_file($context->id, $component, $filearea, 0, $filepath, $filename) or $file->is_directory()) {
 375             send_file_not_found();
 376         }
 377
 378         session_get_instance()->write_close(); // unlock session during fileserving
 379         send_stored_file($file, 0, 0, true); // must force download - security!
 380
 381     } else if ($filearea === 'profile' and $context->contextlevel == CONTEXT_COURSE) {
 382         $userid = (int)array_shift($args);
 383         $usercontext = get_context_instance(CONTEXT_USER, $userid);
 384
 385         if ($CFG->forcelogin) {
 386             require_login();
 387         }
 388
 389         if (!empty($CFG->forceloginforprofiles)) {
 390             require_login();
 391             if (isguestuser()) {
 392                 print_error('noguest');
 393             }
 394
 395             //TODO: review this logic of user profile access prevention
 396             if (!has_coursecontact_role($userid) and !has_capability('moodle/user:viewdetails', $usercontext)) {
 397                 print_error('usernotavailable');
 398             }
 399             if (!has_capability('moodle/user:viewdetails', $context) && !has_capability('moodle/user:viewdetails', $usercontext)) {
 400                 print_error('cannotviewprofile');
 401             }
 402             if (!is_enrolled($context, $userid)) {
 403                 print_error('notenrolledprofile');
 404             }
 405             if (groups_get_course_groupmode($course) == SEPARATEGROUPS and !has_capability('moodle/site:accessallgroups', $context)) {
 406                 print_error('groupnotamember');
 407             }
 408         }
 409
 410         $filename = array_pop($args);
 411         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 412         if (!$file = $fs->get_file($usercontext->id, 'user', 'profile', 0, $filepath, $filename) or $file->is_directory()) {
 413             send_file_not_found();
 414         }
 415
 416         session_get_instance()->write_close(); // unlock session during fileserving
 417         send_stored_file($file, 0, 0, true); // must force download - security!
 418
 419     } else if ($filearea === 'backup' and $context->contextlevel == CONTEXT_USER) {
 420         require_login();
 421
 422         if (isguestuser()) {
 423             send_file_not_found();
 424         }
 425         $userid = $context->instanceid;
 426
 427         if ($USER->id != $userid) {
 428             send_file_not_found();
 429         }
 430
 431         $filename = array_pop($args);
 432         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 433         if (!$file = $fs->get_file($context->id, 'user', 'backup', 0, $filepath, $filename) or $file->is_directory()) {
 434             send_file_not_found();
 435         }
 436
 437         session_get_instance()->write_close(); // unlock session during fileserving
 438         send_stored_file($file, 0, 0, true); // must force download - security!
 439
 440     } else {
 441         send_file_not_found();
 442     }
 443
 444 // ========================================================================================================================
 445 } else if ($component === 'coursecat') {
 446     if ($context->contextlevel != CONTEXT_COURSECAT) {
 447         send_file_not_found();
 448     }
 449
 450     if ($filearea === 'description') {
 451         if ($CFG->forcelogin) {
 452             // no login necessary - unless login forced everywhere
 453             require_login();
 454         }
 455
 456         $filename = array_pop($args);
 457         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 458         if (!$file = $fs->get_file($context->id, 'coursecat', 'description', 0, $filepath, $filename) or $file->is_directory()) {
 459             send_file_not_found();
 460         }
 461
 462         session_get_instance()->write_close(); // unlock session during fileserving
 463         send_stored_file($file, 60*60, 0, $forcedownload);
 464     } else {
 465         send_file_not_found();
 466     }
 467
 468 // ========================================================================================================================
 469 } else if ($component === 'course') {
 470     if ($context->contextlevel != CONTEXT_COURSE) {
 471         send_file_not_found();
 472     }
 473
 474     if ($filearea === 'summary') {
 475         if ($CFG->forcelogin) {
 476             require_login();
 477         }
 478
 479         $filename = array_pop($args);
 480         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 481         if (!$file = $fs->get_file($context->id, 'course', 'summary', 0, $filepath, $filename) or $file->is_directory()) {
 482             send_file_not_found();
 483         }
 484
 485         session_get_instance()->write_close(); // unlock session during fileserving
 486         send_stored_file($file, 60*60, 0, $forcedownload);
 487
 488     } else if ($filearea === 'section') {
 489         if ($CFG->forcelogin) {
 490             require_login($course);
 491         } else if ($course->id != SITEID) {
 492             require_login($course);
 493         }
 494
 495         $sectionid = (int)array_shift($args);
 496
 497         if (!$section = $DB->get_record('course_sections', array('id'=>$sectionid, 'course'=>$course->id))) {
 498             send_file_not_found();
 499         }
 500
 501         if ($course->numsections < $section->section) {
 502             if (!has_capability('moodle/course:update', $context)) {
 503                 // block access to unavailable sections if can not edit course
 504                 send_file_not_found();
 505             }
 506         }
 507
 508         $filename = array_pop($args);
 509         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 510         if (!$file = $fs->get_file($context->id, 'course', 'section', $sectionid, $filepath, $filename) or $file->is_directory()) {
 511             send_file_not_found();
 512         }
 513
 514         session_get_instance()->write_close(); // unlock session during fileserving
 515         send_stored_file($file, 60*60, 0, $forcedownload);
 516
 517     } else {
 518         send_file_not_found();
 519     }
 520
 521 } else if ($component === 'group') {
 522     if ($context->contextlevel != CONTEXT_COURSE) {
 523         send_file_not_found();
 524     }
 525
 526     require_course_login($course, true, null, false);
 527
 528     $groupid = (int)array_shift($args);
 529
 530     $group = $DB->get_record('groups', array('id'=>$groupid, 'courseid'=>$course->id), '*', MUST_EXIST);
 531     if (($course->groupmodeforce and $course->groupmode == SEPARATEGROUPS) and !has_capability('moodle/site:accessallgroups', $context) and !groups_is_member($group->id, $USER->id)) {
 532         // do not allow access to separate group info if not member or teacher
 533         send_file_not_found();
 534     }
 535
 536     if ($filearea === 'description') {
 537
 538         require_login($course);
 539
 540         $filename = array_pop($args);
 541         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 542         if (!$file = $fs->get_file($context->id, 'group', 'description', $group->id, $filepath, $filename) or $file->is_directory()) {
 543             send_file_not_found();
 544         }
 545
 546         session_get_instance()->write_close(); // unlock session during fileserving
 547         send_stored_file($file, 60*60, 0, $forcedownload);
 548
 549     } else if ($filearea === 'icon') {
 550         $filename = array_pop($args);
 551
 552         if ($filename !== 'f1' and $filename !== 'f2') {
 553             send_file_not_found();
 554         }
 555         if (!$file = $fs->get_file($context->id, 'group', 'icon', $group->id, '/', $filename.'.png')) {
 556             if (!$file = $fs->get_file($context->id, 'group', 'icon', $group->id, '/', $filename.'.jpg')) {
 557                 send_file_not_found();
 558             }
 559         }
 560
 561         session_get_instance()->write_close(); // unlock session during fileserving
 562         send_stored_file($file, 60*60);
 563
 564     } else {
 565         send_file_not_found();
 566     }
 567
 568 } else if ($component === 'grouping') {
 569     if ($context->contextlevel != CONTEXT_COURSE) {
 570         send_file_not_found();
 571     }
 572
 573     require_login($course);
 574
 575     $groupingid = (int)array_shift($args);
 576
 577     // note: everybody has access to grouping desc images for now
 578     if ($filearea === 'description') {
 579
 580         $filename = array_pop($args);
 581         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 582         if (!$file = $fs->get_file($context->id, 'grouping', 'description', $groupingid, $filepath, $filename) or $file->is_directory()) {
 583             send_file_not_found();
 584         }
 585
 586         session_get_instance()->write_close(); // unlock session during fileserving
 587         send_stored_file($file, 60*60, 0, $forcedownload);
 588
 589     } else {
 590         send_file_not_found();
 591     }
 592
 593 // ========================================================================================================================
 594 } else if ($component === 'backup') {
 595     if ($filearea === 'course' and $context->contextlevel == CONTEXT_COURSE) {
 596         require_login($course);
 597         require_capability('moodle/backup:downloadfile', $context);
 598
 599         $filename = array_pop($args);
 600         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 601         if (!$file = $fs->get_file($context->id, 'backup', 'course', 0, $filepath, $filename) or $file->is_directory()) {
 602             send_file_not_found();
 603         }
 604
 605         session_get_instance()->write_close(); // unlock session during fileserving
 606         send_stored_file($file, 0, 0, $forcedownload);
 607
 608     } else if ($filearea === 'section' and $context->contextlevel == CONTEXT_COURSE) {
 609         require_login($course);
 610         require_capability('moodle/backup:downloadfile', $context);
 611
 612         $sectionid = (int)array_shift($args);
 613
 614         $filename = array_pop($args);
 615         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 616         if (!$file = $fs->get_file($context->id, 'backup', 'section', $sectionid, $filepath, $filename) or $file->is_directory()) {
 617             send_file_not_found();
 618         }
 619
 620         session_get_instance()->write_close();
 621         send_stored_file($file, 60*60, 0, $forcedownload);
 622
 623     } else if ($filearea === 'activity' and $context->contextlevel == CONTEXT_MODULE) {
 624         require_login($course, false, $cm);
 625         require_capability('moodle/backup:downloadfile', $context);
 626
 627         $filename = array_pop($args);
 628         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 629         if (!$file = $fs->get_file($context->id, 'backup', 'activity', 0, $filepath, $filename) or $file->is_directory()) {
 630             send_file_not_found();
 631         }
 632
 633         session_get_instance()->write_close();
 634         send_stored_file($file, 60*60, 0, $forcedownload);
 635
 636     } else if ($filearea === 'automated' and $context->contextlevel == CONTEXT_COURSE) {
 637         // Backup files that were generated by the automated backup systems.
 638
 639         require_login($course);
 640         require_capability('moodle/site:config', $context);
 641
 642         $filename = array_pop($args);
 643         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 644         if (!$file = $fs->get_file($context->id, 'backup', 'automated', 0, $filepath, $filename) or $file->is_directory()) {
 645             send_file_not_found();
 646         }
 647
 648         session_get_instance()->write_close(); // unlock session during fileserving
 649         send_stored_file($file, 0, 0, $forcedownload);
 650
 651     } else {
 652         send_file_not_found();
 653     }
 654
 655 // ========================================================================================================================
 656 } else if ($component === 'question') {
 657     require_once($CFG->libdir . '/questionlib.php');
 658     question_pluginfile($course, $context, 'question', $filearea, $args, $forcedownload);
 659     send_file_not_found();
 660
 661 // ========================================================================================================================
 662 } else if (strpos($component, 'mod_') === 0) {
 663     $modname = substr($component, 4);
 664     if (!file_exists("$CFG->dirroot/mod/$modname/lib.php")) {
 665         send_file_not_found();
 666     }
 667     require_once("$CFG->dirroot/mod/$modname/lib.php");
 668
 669     if ($context->contextlevel == CONTEXT_MODULE) {
 670         if ($cm->modname !== $modname) {
 671             // somebody tries to gain illegal access, cm type must match the component!
 672             send_file_not_found();
 673         }
 674     }
 675
 676     if ($filearea === 'intro') {
 677         if (!plugin_supports('mod', $modname, FEATURE_MOD_INTRO, true)) {
 678             send_file_not_found();
 679         }
 680         require_course_login($course, true, $cm);
 681
 682         // all users may access it
 683         $filename = array_pop($args);
 684         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 685         if (!$file = $fs->get_file($context->id, 'mod_'.$modname, 'intro', 0, $filepath, $filename) or $file->is_directory()) {
 686             send_file_not_found();
 687         }
 688
 689         $lifetime = isset($CFG->filelifetime) ? $CFG->filelifetime : 86400;
 690
 691         // finally send the file
 692         send_stored_file($file, $lifetime, 0);
 693     }
 694
 695     $filefunction = $component.'_pluginfile';
 696     $filefunctionold = $modname.'_pluginfile';
 697     if (function_exists($filefunction)) {
 698         // if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
 699         $filefunction($course, $cm, $context, $filearea, $args, $forcedownload);
 700     } else if (function_exists($filefunctionold)) {
 701         // if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
 702         $filefunctionold($course, $cm, $context, $filearea, $args, $forcedownload);
 703     }
 704
 705     send_file_not_found();
 706
 707 // ========================================================================================================================
 708 } else if (strpos($component, 'block_') === 0) {
 709     $blockname = substr($component, 6);
 710     // note: no more class methods in blocks please, that is ....
 711     if (!file_exists("$CFG->dirroot/blocks/$blockname/lib.php")) {
 712         send_file_not_found();
 713     }
 714     require_once("$CFG->dirroot/blocks/$blockname/lib.php");
 715
 716     if ($context->contextlevel == CONTEXT_BLOCK) {
 717         $birecord = $DB->get_record('block_instances', array('id'=>$context->instanceid), '*',MUST_EXIST);
 718         if ($birecord->blockname !== $blockname) {
 719             // somebody tries to gain illegal access, cm type must match the component!
 720             send_file_not_found();
 721         }
 722     } else {
 723         $birecord = null;
 724     }
 725
 726     $filefunction = $component.'_pluginfile';
 727     if (function_exists($filefunction)) {
 728         // if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
 729         $filefunction($course, $birecord, $context, $filearea, $args, $forcedownload);
 730     }
 731
 732     send_file_not_found();
 733
 734 } else if (strpos($component, '_') === false) {
 735     // all core subsystems have to be specified above, no more guessing here!
 736     send_file_not_found();
 737
 738 } else {
 739     // try to serve general plugin file in arbitrary context
 740     $dir = get_component_directory($component);
 741     if (!file_exists("$dir/lib.php")) {
 742         send_file_not_found();
 743     }
 744     include_once("$dir/lib.php");
 745
 746     $filefunction = $component.'_pluginfile';
 747     if (function_exists($filefunction)) {
 748         // if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
 749         $filefunction($course, $cm, $context, $filearea, $args, $forcedownload);
 750     }
 751
 752     send_file_not_found();
 753 }