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         // XXX: pix_url will initialize $PAGE, so we have to set up context here
 298         // this temp hack should be fixed by better solution
 299         $PAGE->set_context(get_system_context());
 300         if (!empty($CFG->forcelogin) and !isloggedin()) {
 301             // protect images if login required and not logged in;
 302             // do not use require_login() because it is expensive and not suitable here anyway
 303             redirect($OUTPUT->pix_url('u/f1'));
 304         }
 305         $filename = array_pop($args);
 306         if ($filename !== 'f1' and $filename !== 'f2') {
 307             redirect($OUTPUT->pix_url('u/f1'));
 308         }
 309         if (!$file = $fs->get_file($context->id, 'user', 'icon', 0, '/', $filename.'/.png')) {
 310             if (!$file = $fs->get_file($context->id, 'user', 'icon', 0, '/', $filename.'/.jpg')) {
 311                 redirect($OUTPUT->pix_url('u/'.$filename));
 312             }
 313         }
 314
 315         send_stored_file($file, 60*60*24); // enable long caching, there are many images on each page
 316
 317     } else if ($filearea === 'private' and $context->contextlevel == CONTEXT_USER) {
 318         require_login();
 319
 320         if (isguestuser()) {
 321             send_file_not_found();
 322         }
 323
 324         if ($USER->id !== $context->instanceid) {
 325             send_file_not_found();
 326         }
 327
 328         $filename = array_pop($args);
 329         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 330         if (!$file = $fs->get_file($context->id, $component, $filearea, 0, $filepath, $filename) or $file->is_directory()) {
 331             send_file_not_found();
 332         }
 333
 334         session_get_instance()->write_close(); // unlock session during fileserving
 335         send_stored_file($file, 0, 0, true); // must force download - security!
 336
 337     } else if ($filearea === 'profile' and $context->contextlevel == CONTEXT_USER) {
 338
 339         if ($CFG->forcelogin) {
 340             require_login();
 341         }
 342
 343         $userid = $context->instanceid;
 344
 345         if ($USER->id == $userid) {
 346             // always can access own
 347
 348         } else if (!empty($CFG->forceloginforprofiles)) {
 349             require_login();
 350
 351             if (isguestuser()) {
 352                 send_file_not_found();
 353             }
 354
 355             // we allow access to site profile of all course contacts (usually teachers)
 356             if (!has_coursecontact_role($userid) && !has_capability('moodle/user:viewdetails', $context)) {
 357                 send_file_not_found();
 358             }
 359
 360             $canview = false;
 361             if (has_capability('moodle/user:viewdetails', $context)) {
 362                 $canview = true;
 363             } else {
 364                 $courses = enrol_get_my_courses();
 365             }
 366
 367             while (!$canview && count($courses) > 0) {
 368                 $course = array_shift($courses);
 369                 if (has_capability('moodle/user:viewdetails', get_context_instance(CONTEXT_COURSE, $course->id))) {
 370                     $canview = true;
 371                 }
 372             }
 373         }
 374
 375         $filename = array_pop($args);
 376         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 377         if (!$file = $fs->get_file($context->id, $component, $filearea, 0, $filepath, $filename) or $file->is_directory()) {
 378             send_file_not_found();
 379         }
 380
 381         session_get_instance()->write_close(); // unlock session during fileserving
 382         send_stored_file($file, 0, 0, true); // must force download - security!
 383
 384     } else if ($filearea === 'profile' and $context->contextlevel == CONTEXT_COURSE) {
 385         $userid = (int)array_shift($args);
 386         $usercontext = get_context_instance(CONTEXT_USER, $userid);
 387
 388         if ($CFG->forcelogin) {
 389             require_login();
 390         }
 391
 392         if (!empty($CFG->forceloginforprofiles)) {
 393             require_login();
 394             if (isguestuser()) {
 395                 print_error('noguest');
 396             }
 397
 398             //TODO: review this logic of user profile access prevention
 399             if (!has_coursecontact_role($userid) and !has_capability('moodle/user:viewdetails', $usercontext)) {
 400                 print_error('usernotavailable');
 401             }
 402             if (!has_capability('moodle/user:viewdetails', $context) && !has_capability('moodle/user:viewdetails', $usercontext)) {
 403                 print_error('cannotviewprofile');
 404             }
 405             if (!is_enrolled($context, $userid)) {
 406                 print_error('notenrolledprofile');
 407             }
 408             if (groups_get_course_groupmode($course) == SEPARATEGROUPS and !has_capability('moodle/site:accessallgroups', $context)) {
 409                 print_error('groupnotamember');
 410             }
 411         }
 412
 413         $filename = array_pop($args);
 414         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 415         if (!$file = $fs->get_file($usercontext->id, 'user', 'profile', 0, $filepath, $filename) or $file->is_directory()) {
 416             send_file_not_found();
 417         }
 418
 419         session_get_instance()->write_close(); // unlock session during fileserving
 420         send_stored_file($file, 0, 0, true); // must force download - security!
 421
 422     } else if ($filearea === 'backup' and $context->contextlevel == CONTEXT_USER) {
 423         require_login();
 424
 425         if (isguestuser()) {
 426             send_file_not_found();
 427         }
 428         $userid = $context->instanceid;
 429
 430         if ($USER->id != $userid) {
 431             send_file_not_found();
 432         }
 433
 434         $filename = array_pop($args);
 435         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 436         if (!$file = $fs->get_file($context->id, 'user', 'backup', 0, $filepath, $filename) or $file->is_directory()) {
 437             send_file_not_found();
 438         }
 439
 440         session_get_instance()->write_close(); // unlock session during fileserving
 441         send_stored_file($file, 0, 0, true); // must force download - security!
 442
 443     } else {
 444         send_file_not_found();
 445     }
 446
 447 // ========================================================================================================================
 448 } else if ($component === 'coursecat') {
 449     if ($context->contextlevel != CONTEXT_COURSECAT) {
 450         send_file_not_found();
 451     }
 452
 453     if ($filearea === 'description') {
 454         if ($CFG->forcelogin) {
 455             // no login necessary - unless login forced everywhere
 456             require_login();
 457         }
 458
 459         $filename = array_pop($args);
 460         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 461         if (!$file = $fs->get_file($context->id, 'coursecat', 'description', 0, $filepath, $filename) or $file->is_directory()) {
 462             send_file_not_found();
 463         }
 464
 465         session_get_instance()->write_close(); // unlock session during fileserving
 466         send_stored_file($file, 60*60, 0, $forcedownload);
 467     } else {
 468         send_file_not_found();
 469     }
 470
 471 // ========================================================================================================================
 472 } else if ($component === 'course') {
 473     if ($context->contextlevel != CONTEXT_COURSE) {
 474         send_file_not_found();
 475     }
 476
 477     if ($filearea === 'summary') {
 478         if ($CFG->forcelogin) {
 479             require_login();
 480         }
 481
 482         $filename = array_pop($args);
 483         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 484         if (!$file = $fs->get_file($context->id, 'course', 'summary', 0, $filepath, $filename) or $file->is_directory()) {
 485             send_file_not_found();
 486         }
 487
 488         session_get_instance()->write_close(); // unlock session during fileserving
 489         send_stored_file($file, 60*60, 0, $forcedownload);
 490
 491     } else if ($filearea === 'section') {
 492         if ($CFG->forcelogin) {
 493             require_login($course);
 494         } else if ($course->id != SITEID) {
 495             require_login($course);
 496         }
 497
 498         $sectionid = (int)array_shift($args);
 499
 500         if (!$section = $DB->get_record('course_sections', array('id'=>$sectionid, 'course'=>$course->id))) {
 501             send_file_not_found();
 502         }
 503
 504         if ($course->numsections < $section->section) {
 505             if (!has_capability('moodle/course:update', $context)) {
 506                 // block access to unavailable sections if can not edit course
 507                 send_file_not_found();
 508             }
 509         }
 510
 511         $filename = array_pop($args);
 512         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 513         if (!$file = $fs->get_file($context->id, 'course', 'section', $sectionid, $filepath, $filename) or $file->is_directory()) {
 514             send_file_not_found();
 515         }
 516
 517         session_get_instance()->write_close(); // unlock session during fileserving
 518         send_stored_file($file, 60*60, 0, $forcedownload);
 519
 520     } else {
 521         send_file_not_found();
 522     }
 523
 524 } else if ($component === 'group') {
 525     if ($context->contextlevel != CONTEXT_COURSE) {
 526         send_file_not_found();
 527     }
 528
 529     require_course_login($course, true, null, false);
 530
 531     $groupid = (int)array_shift($args);
 532
 533     $group = $DB->get_record('groups', array('id'=>$groupid, 'courseid'=>$course->id), '*', MUST_EXIST);
 534     if (($course->groupmodeforce and $course->groupmode == SEPARATEGROUPS) and !has_capability('moodle/site:accessallgroups', $context) and !groups_is_member($group->id, $USER->id)) {
 535         // do not allow access to separate group info if not member or teacher
 536         send_file_not_found();
 537     }
 538
 539     if ($filearea === 'description') {
 540
 541         require_login($course);
 542
 543         $filename = array_pop($args);
 544         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 545         if (!$file = $fs->get_file($context->id, 'group', 'description', $group->id, $filepath, $filename) or $file->is_directory()) {
 546             send_file_not_found();
 547         }
 548
 549         session_get_instance()->write_close(); // unlock session during fileserving
 550         send_stored_file($file, 60*60, 0, $forcedownload);
 551
 552     } else if ($filearea === 'icon') {
 553         $filename = array_pop($args);
 554
 555         if ($filename !== 'f1' and $filename !== 'f2') {
 556             send_file_not_found();
 557         }
 558         if (!$file = $fs->get_file($context->id, 'group', 'icon', $group->id, '/', $filename.'.png')) {
 559             if (!$file = $fs->get_file($context->id, 'group', 'icon', $group->id, '/', $filename.'.jpg')) {
 560                 send_file_not_found();
 561             }
 562         }
 563
 564         session_get_instance()->write_close(); // unlock session during fileserving
 565         send_stored_file($file, 60*60);
 566
 567     } else {
 568         send_file_not_found();
 569     }
 570
 571 } else if ($component === 'grouping') {
 572     if ($context->contextlevel != CONTEXT_COURSE) {
 573         send_file_not_found();
 574     }
 575
 576     require_login($course);
 577
 578     $groupingid = (int)array_shift($args);
 579
 580     // note: everybody has access to grouping desc images for now
 581     if ($filearea === 'description') {
 582
 583         $filename = array_pop($args);
 584         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 585         if (!$file = $fs->get_file($context->id, 'grouping', 'description', $groupingid, $filepath, $filename) or $file->is_directory()) {
 586             send_file_not_found();
 587         }
 588
 589         session_get_instance()->write_close(); // unlock session during fileserving
 590         send_stored_file($file, 60*60, 0, $forcedownload);
 591
 592     } else {
 593         send_file_not_found();
 594     }
 595
 596 // ========================================================================================================================
 597 } else if ($component === 'backup') {
 598     if ($filearea === 'course' and $context->contextlevel == CONTEXT_COURSE) {
 599         require_login($course);
 600         require_capability('moodle/backup:downloadfile', $context);
 601
 602         $filename = array_pop($args);
 603         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 604         if (!$file = $fs->get_file($context->id, 'backup', 'course', 0, $filepath, $filename) or $file->is_directory()) {
 605             send_file_not_found();
 606         }
 607
 608         session_get_instance()->write_close(); // unlock session during fileserving
 609         send_stored_file($file, 0, 0, $forcedownload);
 610
 611     } else if ($filearea === 'section' and $context->contextlevel == CONTEXT_COURSE) {
 612         require_login($course);
 613         require_capability('moodle/backup:downloadfile', $context);
 614
 615         $sectionid = (int)array_shift($args);
 616
 617         $filename = array_pop($args);
 618         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 619         if (!$file = $fs->get_file($context->id, 'backup', 'section', $sectionid, $filepath, $filename) or $file->is_directory()) {
 620             send_file_not_found();
 621         }
 622
 623         session_get_instance()->write_close();
 624         send_stored_file($file, 60*60, 0, $forcedownload);
 625
 626     } else if ($filearea === 'activity' and $context->contextlevel == CONTEXT_MODULE) {
 627         require_login($course, false, $cm);
 628         require_capability('moodle/backup:downloadfile', $context);
 629
 630         $filename = array_pop($args);
 631         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 632         if (!$file = $fs->get_file($context->id, 'backup', 'activity', 0, $filepath, $filename) or $file->is_directory()) {
 633             send_file_not_found();
 634         }
 635
 636         session_get_instance()->write_close();
 637         send_stored_file($file, 60*60, 0, $forcedownload);
 638
 639     } else if ($filearea === 'automated' and $context->contextlevel == CONTEXT_COURSE) {
 640         // Backup files that were generated by the automated backup systems.
 641
 642         require_login($course);
 643         require_capability('moodle/site:config', $context);
 644
 645         $filename = array_pop($args);
 646         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 647         if (!$file = $fs->get_file($context->id, 'backup', 'automated', 0, $filepath, $filename) or $file->is_directory()) {
 648             send_file_not_found();
 649         }
 650
 651         session_get_instance()->write_close(); // unlock session during fileserving
 652         send_stored_file($file, 0, 0, $forcedownload);
 653
 654     } else {
 655         send_file_not_found();
 656     }
 657
 658 // ========================================================================================================================
 659 } else if ($component === 'question') {
 660     require_once($CFG->libdir . '/questionlib.php');
 661     question_pluginfile($course, $context, 'question', $filearea, $args, $forcedownload);
 662     send_file_not_found();
 663
 664 // ========================================================================================================================
 665 } else if (strpos($component, 'mod_') === 0) {
 666     $modname = substr($component, 4);
 667     if (!file_exists("$CFG->dirroot/mod/$modname/lib.php")) {
 668         send_file_not_found();
 669     }
 670     require_once("$CFG->dirroot/mod/$modname/lib.php");
 671
 672     if ($context->contextlevel == CONTEXT_MODULE) {
 673         if ($cm->modname !== $modname) {
 674             // somebody tries to gain illegal access, cm type must match the component!
 675             send_file_not_found();
 676         }
 677     }
 678
 679     if ($filearea === 'intro') {
 680         if (!plugin_supports('mod', $modname, FEATURE_MOD_INTRO, true)) {
 681             send_file_not_found();
 682         }
 683         require_course_login($course, true, $cm);
 684
 685         // all users may access it
 686         $filename = array_pop($args);
 687         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 688         if (!$file = $fs->get_file($context->id, 'mod_'.$modname, 'intro', 0, $filepath, $filename) or $file->is_directory()) {
 689             send_file_not_found();
 690         }
 691
 692         $lifetime = isset($CFG->filelifetime) ? $CFG->filelifetime : 86400;
 693
 694         // finally send the file
 695         send_stored_file($file, $lifetime, 0);
 696     }
 697
 698     $filefunction = $component.'_pluginfile';
 699     $filefunctionold = $modname.'_pluginfile';
 700     if (function_exists($filefunction)) {
 701         // if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
 702         $filefunction($course, $cm, $context, $filearea, $args, $forcedownload);
 703     } else if (function_exists($filefunctionold)) {
 704         // if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
 705         $filefunctionold($course, $cm, $context, $filearea, $args, $forcedownload);
 706     }
 707
 708     send_file_not_found();
 709
 710 // ========================================================================================================================
 711 } else if (strpos($component, 'block_') === 0) {
 712     $blockname = substr($component, 6);
 713     // note: no more class methods in blocks please, that is ....
 714     if (!file_exists("$CFG->dirroot/blocks/$blockname/lib.php")) {
 715         send_file_not_found();
 716     }
 717     require_once("$CFG->dirroot/blocks/$blockname/lib.php");
 718
 719     if ($context->contextlevel == CONTEXT_BLOCK) {
 720         $birecord = $DB->get_record('block_instances', array('id'=>$context->instanceid), '*',MUST_EXIST);
 721         if ($birecord->blockname !== $blockname) {
 722             // somebody tries to gain illegal access, cm type must match the component!
 723             send_file_not_found();
 724         }
 725     } else {
 726         $birecord = null;
 727     }
 728
 729     $filefunction = $component.'_pluginfile';
 730     if (function_exists($filefunction)) {
 731         // if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
 732         $filefunction($course, $birecord, $context, $filearea, $args, $forcedownload);
 733     }
 734
 735     send_file_not_found();
 736
 737 } else if (strpos($component, '_') === false) {
 738     // all core subsystems have to be specified above, no more guessing here!
 739     send_file_not_found();
 740
 741 } else {
 742     // try to serve general plugin file in arbitrary context
 743     $dir = get_component_directory($component);
 744     if (!file_exists("$dir/lib.php")) {
 745         send_file_not_found();
 746     }
 747     include_once("$dir/lib.php");
 748
 749     $filefunction = $component.'_pluginfile';
 750     if (function_exists($filefunction)) {
 751         // if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
 752         $filefunction($course, $cm, $context, $filearea, $args, $forcedownload);
 753     }
 754
 755     send_file_not_found();
 756 }