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     $entryid = (int)array_shift($args);
  89     if (!$entry = $DB->get_record('post', array('module'=>'blog', 'id'=>$entryid))) {
  90         send_file_not_found();
  91     }
  92     if ($CFG->bloglevel < BLOG_GLOBAL_LEVEL) {
  93         require_login();
  94         if (isguestuser()) {
  95             print_error('noguest');
  96         }
  97         if ($CFG->bloglevel == BLOG_USER_LEVEL) {
  98             if ($USER->id != $entry->userid) {
  99                 send_file_not_found();
 100             }
 101         }
 102     }
 103
 104     if ('publishstate' === 'public') {
 105         if ($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         $redirect = false;
 298         if (count($args) == 1) {
 299             $themename = theme_config::DEFAULT_THEME;
 300             $filename = array_shift($args);
 301         } else {
 302             $themename = array_shift($args);
 303             $filename = array_shift($args);
 304         }
 305         if ((!empty($CFG->forcelogin) and !isloggedin()) ||
 306                 (!empty($CFG->forceloginforprofileimage) && (!isloggedin() || isguestuser()))) {
 307             // protect images if login required and not logged in;
 308             // also if login is required for profile images and is not logged in or guest
 309             // do not use require_login() because it is expensive and not suitable here anyway
 310             $redirect = true;
 311         }
 312         if (!$redirect and ($filename !== 'f1' and $filename !== 'f2')) {
 313             $filename = 'f1';
 314             $redirect = true;
 315         }
 316         if (!$redirect && !$file = $fs->get_file($context->id, 'user', 'icon', 0, '/', $filename.'/.png')) {
 317             if (!$file = $fs->get_file($context->id, 'user', 'icon', 0, '/', $filename.'/.jpg')) {
 318                 $redirect = true;
 319             }
 320         }
 321         if ($redirect) {
 322             $theme = theme_config::load($themename);
 323             redirect($theme->pix_url('u/'.$filename, 'moodle'));
 324         }
 325         send_stored_file($file, 60*60*24); // enable long caching, there are many images on each page
 326
 327     } else if ($filearea === 'private' and $context->contextlevel == CONTEXT_USER) {
 328         require_login();
 329
 330         if (isguestuser()) {
 331             send_file_not_found();
 332         }
 333
 334         if ($USER->id !== $context->instanceid) {
 335             send_file_not_found();
 336         }
 337
 338         $filename = array_pop($args);
 339         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 340         if (!$file = $fs->get_file($context->id, $component, $filearea, 0, $filepath, $filename) or $file->is_directory()) {
 341             send_file_not_found();
 342         }
 343
 344         session_get_instance()->write_close(); // unlock session during fileserving
 345         send_stored_file($file, 0, 0, true); // must force download - security!
 346
 347     } else if ($filearea === 'profile' and $context->contextlevel == CONTEXT_USER) {
 348
 349         if ($CFG->forcelogin) {
 350             require_login();
 351         }
 352
 353         $userid = $context->instanceid;
 354
 355         if ($USER->id == $userid) {
 356             // always can access own
 357
 358         } else if (!empty($CFG->forceloginforprofiles)) {
 359             require_login();
 360
 361             if (isguestuser()) {
 362                 send_file_not_found();
 363             }
 364
 365             // we allow access to site profile of all course contacts (usually teachers)
 366             if (!has_coursecontact_role($userid) && !has_capability('moodle/user:viewdetails', $context)) {
 367                 send_file_not_found();
 368             }
 369
 370             $canview = false;
 371             if (has_capability('moodle/user:viewdetails', $context)) {
 372                 $canview = true;
 373             } else {
 374                 $courses = enrol_get_my_courses();
 375             }
 376
 377             while (!$canview && count($courses) > 0) {
 378                 $course = array_shift($courses);
 379                 if (has_capability('moodle/user:viewdetails', get_context_instance(CONTEXT_COURSE, $course->id))) {
 380                     $canview = true;
 381                 }
 382             }
 383         }
 384
 385         $filename = array_pop($args);
 386         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 387         if (!$file = $fs->get_file($context->id, $component, $filearea, 0, $filepath, $filename) or $file->is_directory()) {
 388             send_file_not_found();
 389         }
 390
 391         session_get_instance()->write_close(); // unlock session during fileserving
 392         send_stored_file($file, 0, 0, true); // must force download - security!
 393
 394     } else if ($filearea === 'profile' and $context->contextlevel == CONTEXT_COURSE) {
 395         $userid = (int)array_shift($args);
 396         $usercontext = get_context_instance(CONTEXT_USER, $userid);
 397
 398         if ($CFG->forcelogin) {
 399             require_login();
 400         }
 401
 402         if (!empty($CFG->forceloginforprofiles)) {
 403             require_login();
 404             if (isguestuser()) {
 405                 print_error('noguest');
 406             }
 407
 408             //TODO: review this logic of user profile access prevention
 409             if (!has_coursecontact_role($userid) and !has_capability('moodle/user:viewdetails', $usercontext)) {
 410                 print_error('usernotavailable');
 411             }
 412             if (!has_capability('moodle/user:viewdetails', $context) && !has_capability('moodle/user:viewdetails', $usercontext)) {
 413                 print_error('cannotviewprofile');
 414             }
 415             if (!is_enrolled($context, $userid)) {
 416                 print_error('notenrolledprofile');
 417             }
 418             if (groups_get_course_groupmode($course) == SEPARATEGROUPS and !has_capability('moodle/site:accessallgroups', $context)) {
 419                 print_error('groupnotamember');
 420             }
 421         }
 422
 423         $filename = array_pop($args);
 424         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 425         if (!$file = $fs->get_file($usercontext->id, 'user', 'profile', 0, $filepath, $filename) or $file->is_directory()) {
 426             send_file_not_found();
 427         }
 428
 429         session_get_instance()->write_close(); // unlock session during fileserving
 430         send_stored_file($file, 0, 0, true); // must force download - security!
 431
 432     } else if ($filearea === 'backup' and $context->contextlevel == CONTEXT_USER) {
 433         require_login();
 434
 435         if (isguestuser()) {
 436             send_file_not_found();
 437         }
 438         $userid = $context->instanceid;
 439
 440         if ($USER->id != $userid) {
 441             send_file_not_found();
 442         }
 443
 444         $filename = array_pop($args);
 445         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 446         if (!$file = $fs->get_file($context->id, 'user', 'backup', 0, $filepath, $filename) or $file->is_directory()) {
 447             send_file_not_found();
 448         }
 449
 450         session_get_instance()->write_close(); // unlock session during fileserving
 451         send_stored_file($file, 0, 0, true); // must force download - security!
 452
 453     } else {
 454         send_file_not_found();
 455     }
 456
 457 // ========================================================================================================================
 458 } else if ($component === 'coursecat') {
 459     if ($context->contextlevel != CONTEXT_COURSECAT) {
 460         send_file_not_found();
 461     }
 462
 463     if ($filearea === 'description') {
 464         if ($CFG->forcelogin) {
 465             // no login necessary - unless login forced everywhere
 466             require_login();
 467         }
 468
 469         $filename = array_pop($args);
 470         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 471         if (!$file = $fs->get_file($context->id, 'coursecat', 'description', 0, $filepath, $filename) or $file->is_directory()) {
 472             send_file_not_found();
 473         }
 474
 475         session_get_instance()->write_close(); // unlock session during fileserving
 476         send_stored_file($file, 60*60, 0, $forcedownload);
 477     } else {
 478         send_file_not_found();
 479     }
 480
 481 // ========================================================================================================================
 482 } else if ($component === 'course') {
 483     if ($context->contextlevel != CONTEXT_COURSE) {
 484         send_file_not_found();
 485     }
 486
 487     if ($filearea === 'summary') {
 488         if ($CFG->forcelogin) {
 489             require_login();
 490         }
 491
 492         $filename = array_pop($args);
 493         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 494         if (!$file = $fs->get_file($context->id, 'course', 'summary', 0, $filepath, $filename) or $file->is_directory()) {
 495             send_file_not_found();
 496         }
 497
 498         session_get_instance()->write_close(); // unlock session during fileserving
 499         send_stored_file($file, 60*60, 0, $forcedownload);
 500
 501     } else if ($filearea === 'section') {
 502         if ($CFG->forcelogin) {
 503             require_login($course);
 504         } else if ($course->id != SITEID) {
 505             require_login($course);
 506         }
 507
 508         $sectionid = (int)array_shift($args);
 509
 510         if (!$section = $DB->get_record('course_sections', array('id'=>$sectionid, 'course'=>$course->id))) {
 511             send_file_not_found();
 512         }
 513
 514         if ($course->numsections < $section->section) {
 515             if (!has_capability('moodle/course:update', $context)) {
 516                 // block access to unavailable sections if can not edit course
 517                 send_file_not_found();
 518             }
 519         }
 520
 521         $filename = array_pop($args);
 522         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 523         if (!$file = $fs->get_file($context->id, 'course', 'section', $sectionid, $filepath, $filename) or $file->is_directory()) {
 524             send_file_not_found();
 525         }
 526
 527         session_get_instance()->write_close(); // unlock session during fileserving
 528         send_stored_file($file, 60*60, 0, $forcedownload);
 529
 530     } else {
 531         send_file_not_found();
 532     }
 533
 534 } else if ($component === 'group') {
 535     if ($context->contextlevel != CONTEXT_COURSE) {
 536         send_file_not_found();
 537     }
 538
 539     require_course_login($course, true, null, false);
 540
 541     $groupid = (int)array_shift($args);
 542
 543     $group = $DB->get_record('groups', array('id'=>$groupid, 'courseid'=>$course->id), '*', MUST_EXIST);
 544     if (($course->groupmodeforce and $course->groupmode == SEPARATEGROUPS) and !has_capability('moodle/site:accessallgroups', $context) and !groups_is_member($group->id, $USER->id)) {
 545         // do not allow access to separate group info if not member or teacher
 546         send_file_not_found();
 547     }
 548
 549     if ($filearea === 'description') {
 550
 551         require_login($course);
 552
 553         $filename = array_pop($args);
 554         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 555         if (!$file = $fs->get_file($context->id, 'group', 'description', $group->id, $filepath, $filename) or $file->is_directory()) {
 556             send_file_not_found();
 557         }
 558
 559         session_get_instance()->write_close(); // unlock session during fileserving
 560         send_stored_file($file, 60*60, 0, $forcedownload);
 561
 562     } else if ($filearea === 'icon') {
 563         $filename = array_pop($args);
 564
 565         if ($filename !== 'f1' and $filename !== 'f2') {
 566             send_file_not_found();
 567         }
 568         if (!$file = $fs->get_file($context->id, 'group', 'icon', $group->id, '/', $filename.'.png')) {
 569             if (!$file = $fs->get_file($context->id, 'group', 'icon', $group->id, '/', $filename.'.jpg')) {
 570                 send_file_not_found();
 571             }
 572         }
 573
 574         session_get_instance()->write_close(); // unlock session during fileserving
 575         send_stored_file($file, 60*60);
 576
 577     } else {
 578         send_file_not_found();
 579     }
 580
 581 } else if ($component === 'grouping') {
 582     if ($context->contextlevel != CONTEXT_COURSE) {
 583         send_file_not_found();
 584     }
 585
 586     require_login($course);
 587
 588     $groupingid = (int)array_shift($args);
 589
 590     // note: everybody has access to grouping desc images for now
 591     if ($filearea === 'description') {
 592
 593         $filename = array_pop($args);
 594         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 595         if (!$file = $fs->get_file($context->id, 'grouping', 'description', $groupingid, $filepath, $filename) or $file->is_directory()) {
 596             send_file_not_found();
 597         }
 598
 599         session_get_instance()->write_close(); // unlock session during fileserving
 600         send_stored_file($file, 60*60, 0, $forcedownload);
 601
 602     } else {
 603         send_file_not_found();
 604     }
 605
 606 // ========================================================================================================================
 607 } else if ($component === 'backup') {
 608     if ($filearea === 'course' and $context->contextlevel == CONTEXT_COURSE) {
 609         require_login($course);
 610         require_capability('moodle/backup:downloadfile', $context);
 611
 612         $filename = array_pop($args);
 613         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 614         if (!$file = $fs->get_file($context->id, 'backup', 'course', 0, $filepath, $filename) or $file->is_directory()) {
 615             send_file_not_found();
 616         }
 617
 618         session_get_instance()->write_close(); // unlock session during fileserving
 619         send_stored_file($file, 0, 0, $forcedownload);
 620
 621     } else if ($filearea === 'section' and $context->contextlevel == CONTEXT_COURSE) {
 622         require_login($course);
 623         require_capability('moodle/backup:downloadfile', $context);
 624
 625         $sectionid = (int)array_shift($args);
 626
 627         $filename = array_pop($args);
 628         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 629         if (!$file = $fs->get_file($context->id, 'backup', 'section', $sectionid, $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 === 'activity' and $context->contextlevel == CONTEXT_MODULE) {
 637         require_login($course, false, $cm);
 638         require_capability('moodle/backup:downloadfile', $context);
 639
 640         $filename = array_pop($args);
 641         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 642         if (!$file = $fs->get_file($context->id, 'backup', 'activity', 0, $filepath, $filename) or $file->is_directory()) {
 643             send_file_not_found();
 644         }
 645
 646         session_get_instance()->write_close();
 647         send_stored_file($file, 60*60, 0, $forcedownload);
 648
 649     } else if ($filearea === 'automated' and $context->contextlevel == CONTEXT_COURSE) {
 650         // Backup files that were generated by the automated backup systems.
 651
 652         require_login($course);
 653         require_capability('moodle/site:config', $context);
 654
 655         $filename = array_pop($args);
 656         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 657         if (!$file = $fs->get_file($context->id, 'backup', 'automated', 0, $filepath, $filename) or $file->is_directory()) {
 658             send_file_not_found();
 659         }
 660
 661         session_get_instance()->write_close(); // unlock session during fileserving
 662         send_stored_file($file, 0, 0, $forcedownload);
 663
 664     } else {
 665         send_file_not_found();
 666     }
 667
 668 // ========================================================================================================================
 669 } else if ($component === 'question') {
 670     require_once($CFG->libdir . '/questionlib.php');
 671     question_pluginfile($course, $context, 'question', $filearea, $args, $forcedownload);
 672     send_file_not_found();
 673
 674 // ========================================================================================================================
 675 } else if (strpos($component, 'mod_') === 0) {
 676     $modname = substr($component, 4);
 677     if (!file_exists("$CFG->dirroot/mod/$modname/lib.php")) {
 678         send_file_not_found();
 679     }
 680     require_once("$CFG->dirroot/mod/$modname/lib.php");
 681
 682     if ($context->contextlevel == CONTEXT_MODULE) {
 683         if ($cm->modname !== $modname) {
 684             // somebody tries to gain illegal access, cm type must match the component!
 685             send_file_not_found();
 686         }
 687     }
 688
 689     if ($filearea === 'intro') {
 690         if (!plugin_supports('mod', $modname, FEATURE_MOD_INTRO, true)) {
 691             send_file_not_found();
 692         }
 693         require_course_login($course, true, $cm);
 694
 695         // all users may access it
 696         $filename = array_pop($args);
 697         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 698         if (!$file = $fs->get_file($context->id, 'mod_'.$modname, 'intro', 0, $filepath, $filename) or $file->is_directory()) {
 699             send_file_not_found();
 700         }
 701
 702         $lifetime = isset($CFG->filelifetime) ? $CFG->filelifetime : 86400;
 703
 704         // finally send the file
 705         send_stored_file($file, $lifetime, 0);
 706     }
 707
 708     $filefunction = $component.'_pluginfile';
 709     $filefunctionold = $modname.'_pluginfile';
 710     if (function_exists($filefunction)) {
 711         // if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
 712         $filefunction($course, $cm, $context, $filearea, $args, $forcedownload);
 713     } else if (function_exists($filefunctionold)) {
 714         // if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
 715         $filefunctionold($course, $cm, $context, $filearea, $args, $forcedownload);
 716     }
 717
 718     send_file_not_found();
 719
 720 // ========================================================================================================================
 721 } else if (strpos($component, 'block_') === 0) {
 722     $blockname = substr($component, 6);
 723     // note: no more class methods in blocks please, that is ....
 724     if (!file_exists("$CFG->dirroot/blocks/$blockname/lib.php")) {
 725         send_file_not_found();
 726     }
 727     require_once("$CFG->dirroot/blocks/$blockname/lib.php");
 728
 729     if ($context->contextlevel == CONTEXT_BLOCK) {
 730         $birecord = $DB->get_record('block_instances', array('id'=>$context->instanceid), '*',MUST_EXIST);
 731         if ($birecord->blockname !== $blockname) {
 732             // somebody tries to gain illegal access, cm type must match the component!
 733             send_file_not_found();
 734         }
 735     } else {
 736         $birecord = null;
 737     }
 738
 739     $filefunction = $component.'_pluginfile';
 740     if (function_exists($filefunction)) {
 741         // if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
 742         $filefunction($course, $birecord, $context, $filearea, $args, $forcedownload);
 743     }
 744
 745     send_file_not_found();
 746
 747 } else if (strpos($component, '_') === false) {
 748     // all core subsystems have to be specified above, no more guessing here!
 749     send_file_not_found();
 750
 751 } else {
 752     // try to serve general plugin file in arbitrary context
 753     $dir = get_component_directory($component);
 754     if (!file_exists("$dir/lib.php")) {
 755         send_file_not_found();
 756     }
 757     include_once("$dir/lib.php");
 758
 759     $filefunction = $component.'_pluginfile';
 760     if (function_exists($filefunction)) {
 761         // if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
 762         $filefunction($course, $cm, $context, $filearea, $args, $forcedownload);
 763     }
 764
 765     send_file_not_found();
 766 }