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