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         $redirect = false;
 298         if (count($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             // protect images if login required and not logged in;
 307             // do not use require_login() because it is expensive and not suitable here anyway
 308             $redirect = true;
 309         }
 310         if (!$redirect and ($filename !== 'f1' and $filename !== 'f2')) {
 311             $filename = 'f1';
 312             $redirect = true;
 313         }
 314         if (!$redirect && !$file = $fs->get_file($context->id, 'user', 'icon', 0, '/', $filename.'/.png')) {
 315             if (!$file = $fs->get_file($context->id, 'user', 'icon', 0, '/', $filename.'/.jpg')) {
 316                 $redirect = true;
 317             }
 318         }
 319         if ($redirect) {
 320             $theme = theme_config::load($themename);
 321             redirect($theme->pix_url('u/'.$filename, 'moodle'));
 322         }
 323         send_stored_file($file, 60*60*24); // enable long caching, there are many images on each page
 324
 325     } else if ($filearea === 'private' and $context->contextlevel == CONTEXT_USER) {
 326         require_login();
 327
 328         if (isguestuser()) {
 329             send_file_not_found();
 330         }
 331
 332         if ($USER->id !== $context->instanceid) {
 333             send_file_not_found();
 334         }
 335
 336         $filename = array_pop($args);
 337         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 338         if (!$file = $fs->get_file($context->id, $component, $filearea, 0, $filepath, $filename) or $file->is_directory()) {
 339             send_file_not_found();
 340         }
 341
 342         session_get_instance()->write_close(); // unlock session during fileserving
 343         send_stored_file($file, 0, 0, true); // must force download - security!
 344
 345     } else if ($filearea === 'profile' and $context->contextlevel == CONTEXT_USER) {
 346
 347         if ($CFG->forcelogin) {
 348             require_login();
 349         }
 350
 351         $userid = $context->instanceid;
 352
 353         if ($USER->id == $userid) {
 354             // always can access own
 355
 356         } else if (!empty($CFG->forceloginforprofiles)) {
 357             require_login();
 358
 359             if (isguestuser()) {
 360                 send_file_not_found();
 361             }
 362
 363             // we allow access to site profile of all course contacts (usually teachers)
 364             if (!has_coursecontact_role($userid) && !has_capability('moodle/user:viewdetails', $context)) {
 365                 send_file_not_found();
 366             }
 367
 368             $canview = false;
 369             if (has_capability('moodle/user:viewdetails', $context)) {
 370                 $canview = true;
 371             } else {
 372                 $courses = enrol_get_my_courses();
 373             }
 374
 375             while (!$canview && count($courses) > 0) {
 376                 $course = array_shift($courses);
 377                 if (has_capability('moodle/user:viewdetails', get_context_instance(CONTEXT_COURSE, $course->id))) {
 378                     $canview = true;
 379                 }
 380             }
 381         }
 382
 383         $filename = array_pop($args);
 384         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 385         if (!$file = $fs->get_file($context->id, $component, $filearea, 0, $filepath, $filename) or $file->is_directory()) {
 386             send_file_not_found();
 387         }
 388
 389         session_get_instance()->write_close(); // unlock session during fileserving
 390         send_stored_file($file, 0, 0, true); // must force download - security!
 391
 392     } else if ($filearea === 'profile' and $context->contextlevel == CONTEXT_COURSE) {
 393         $userid = (int)array_shift($args);
 394         $usercontext = get_context_instance(CONTEXT_USER, $userid);
 395
 396         if ($CFG->forcelogin) {
 397             require_login();
 398         }
 399
 400         if (!empty($CFG->forceloginforprofiles)) {
 401             require_login();
 402             if (isguestuser()) {
 403                 print_error('noguest');
 404             }
 405
 406             //TODO: review this logic of user profile access prevention
 407             if (!has_coursecontact_role($userid) and !has_capability('moodle/user:viewdetails', $usercontext)) {
 408                 print_error('usernotavailable');
 409             }
 410             if (!has_capability('moodle/user:viewdetails', $context) && !has_capability('moodle/user:viewdetails', $usercontext)) {
 411                 print_error('cannotviewprofile');
 412             }
 413             if (!is_enrolled($context, $userid)) {
 414                 print_error('notenrolledprofile');
 415             }
 416             if (groups_get_course_groupmode($course) == SEPARATEGROUPS and !has_capability('moodle/site:accessallgroups', $context)) {
 417                 print_error('groupnotamember');
 418             }
 419         }
 420
 421         $filename = array_pop($args);
 422         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 423         if (!$file = $fs->get_file($usercontext->id, 'user', 'profile', 0, $filepath, $filename) or $file->is_directory()) {
 424             send_file_not_found();
 425         }
 426
 427         session_get_instance()->write_close(); // unlock session during fileserving
 428         send_stored_file($file, 0, 0, true); // must force download - security!
 429
 430     } else if ($filearea === 'backup' and $context->contextlevel == CONTEXT_USER) {
 431         require_login();
 432
 433         if (isguestuser()) {
 434             send_file_not_found();
 435         }
 436         $userid = $context->instanceid;
 437
 438         if ($USER->id != $userid) {
 439             send_file_not_found();
 440         }
 441
 442         $filename = array_pop($args);
 443         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 444         if (!$file = $fs->get_file($context->id, 'user', 'backup', 0, $filepath, $filename) or $file->is_directory()) {
 445             send_file_not_found();
 446         }
 447
 448         session_get_instance()->write_close(); // unlock session during fileserving
 449         send_stored_file($file, 0, 0, true); // must force download - security!
 450
 451     } else {
 452         send_file_not_found();
 453     }
 454
 455 // ========================================================================================================================
 456 } else if ($component === 'coursecat') {
 457     if ($context->contextlevel != CONTEXT_COURSECAT) {
 458         send_file_not_found();
 459     }
 460
 461     if ($filearea === 'description') {
 462         if ($CFG->forcelogin) {
 463             // no login necessary - unless login forced everywhere
 464             require_login();
 465         }
 466
 467         $filename = array_pop($args);
 468         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 469         if (!$file = $fs->get_file($context->id, 'coursecat', 'description', 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, $forcedownload);
 475     } else {
 476         send_file_not_found();
 477     }
 478
 479 // ========================================================================================================================
 480 } else if ($component === 'course') {
 481     if ($context->contextlevel != CONTEXT_COURSE) {
 482         send_file_not_found();
 483     }
 484
 485     if ($filearea === 'summary') {
 486         if ($CFG->forcelogin) {
 487             require_login();
 488         }
 489
 490         $filename = array_pop($args);
 491         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 492         if (!$file = $fs->get_file($context->id, 'course', 'summary', 0, $filepath, $filename) or $file->is_directory()) {
 493             send_file_not_found();
 494         }
 495
 496         session_get_instance()->write_close(); // unlock session during fileserving
 497         send_stored_file($file, 60*60, 0, $forcedownload);
 498
 499     } else if ($filearea === 'section') {
 500         if ($CFG->forcelogin) {
 501             require_login($course);
 502         } else if ($course->id != SITEID) {
 503             require_login($course);
 504         }
 505
 506         $sectionid = (int)array_shift($args);
 507
 508         if (!$section = $DB->get_record('course_sections', array('id'=>$sectionid, 'course'=>$course->id))) {
 509             send_file_not_found();
 510         }
 511
 512         if ($course->numsections < $section->section) {
 513             if (!has_capability('moodle/course:update', $context)) {
 514                 // block access to unavailable sections if can not edit course
 515                 send_file_not_found();
 516             }
 517         }
 518
 519         $filename = array_pop($args);
 520         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 521         if (!$file = $fs->get_file($context->id, 'course', 'section', $sectionid, $filepath, $filename) or $file->is_directory()) {
 522             send_file_not_found();
 523         }
 524
 525         session_get_instance()->write_close(); // unlock session during fileserving
 526         send_stored_file($file, 60*60, 0, $forcedownload);
 527
 528     } else {
 529         send_file_not_found();
 530     }
 531
 532 } else if ($component === 'group') {
 533     if ($context->contextlevel != CONTEXT_COURSE) {
 534         send_file_not_found();
 535     }
 536
 537     require_course_login($course, true, null, false);
 538
 539     $groupid = (int)array_shift($args);
 540
 541     $group = $DB->get_record('groups', array('id'=>$groupid, 'courseid'=>$course->id), '*', MUST_EXIST);
 542     if (($course->groupmodeforce and $course->groupmode == SEPARATEGROUPS) and !has_capability('moodle/site:accessallgroups', $context) and !groups_is_member($group->id, $USER->id)) {
 543         // do not allow access to separate group info if not member or teacher
 544         send_file_not_found();
 545     }
 546
 547     if ($filearea === 'description') {
 548
 549         require_login($course);
 550
 551         $filename = array_pop($args);
 552         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 553         if (!$file = $fs->get_file($context->id, 'group', 'description', $group->id, $filepath, $filename) or $file->is_directory()) {
 554             send_file_not_found();
 555         }
 556
 557         session_get_instance()->write_close(); // unlock session during fileserving
 558         send_stored_file($file, 60*60, 0, $forcedownload);
 559
 560     } else if ($filearea === 'icon') {
 561         $filename = array_pop($args);
 562
 563         if ($filename !== 'f1' and $filename !== 'f2') {
 564             send_file_not_found();
 565         }
 566         if (!$file = $fs->get_file($context->id, 'group', 'icon', $group->id, '/', $filename.'.png')) {
 567             if (!$file = $fs->get_file($context->id, 'group', 'icon', $group->id, '/', $filename.'.jpg')) {
 568                 send_file_not_found();
 569             }
 570         }
 571
 572         session_get_instance()->write_close(); // unlock session during fileserving
 573         send_stored_file($file, 60*60);
 574
 575     } else {
 576         send_file_not_found();
 577     }
 578
 579 } else if ($component === 'grouping') {
 580     if ($context->contextlevel != CONTEXT_COURSE) {
 581         send_file_not_found();
 582     }
 583
 584     require_login($course);
 585
 586     $groupingid = (int)array_shift($args);
 587
 588     // note: everybody has access to grouping desc images for now
 589     if ($filearea === 'description') {
 590
 591         $filename = array_pop($args);
 592         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 593         if (!$file = $fs->get_file($context->id, 'grouping', 'description', $groupingid, $filepath, $filename) or $file->is_directory()) {
 594             send_file_not_found();
 595         }
 596
 597         session_get_instance()->write_close(); // unlock session during fileserving
 598         send_stored_file($file, 60*60, 0, $forcedownload);
 599
 600     } else {
 601         send_file_not_found();
 602     }
 603
 604 // ========================================================================================================================
 605 } else if ($component === 'backup') {
 606     if ($filearea === 'course' and $context->contextlevel == CONTEXT_COURSE) {
 607         require_login($course);
 608         require_capability('moodle/backup:downloadfile', $context);
 609
 610         $filename = array_pop($args);
 611         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 612         if (!$file = $fs->get_file($context->id, 'backup', 'course', 0, $filepath, $filename) or $file->is_directory()) {
 613             send_file_not_found();
 614         }
 615
 616         session_get_instance()->write_close(); // unlock session during fileserving
 617         send_stored_file($file, 0, 0, $forcedownload);
 618
 619     } else if ($filearea === 'section' and $context->contextlevel == CONTEXT_COURSE) {
 620         require_login($course);
 621         require_capability('moodle/backup:downloadfile', $context);
 622
 623         $sectionid = (int)array_shift($args);
 624
 625         $filename = array_pop($args);
 626         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 627         if (!$file = $fs->get_file($context->id, 'backup', 'section', $sectionid, $filepath, $filename) or $file->is_directory()) {
 628             send_file_not_found();
 629         }
 630
 631         session_get_instance()->write_close();
 632         send_stored_file($file, 60*60, 0, $forcedownload);
 633
 634     } else if ($filearea === 'activity' and $context->contextlevel == CONTEXT_MODULE) {
 635         require_login($course, false, $cm);
 636         require_capability('moodle/backup:downloadfile', $context);
 637
 638         $filename = array_pop($args);
 639         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 640         if (!$file = $fs->get_file($context->id, 'backup', 'activity', 0, $filepath, $filename) or $file->is_directory()) {
 641             send_file_not_found();
 642         }
 643
 644         session_get_instance()->write_close();
 645         send_stored_file($file, 60*60, 0, $forcedownload);
 646
 647     } else if ($filearea === 'automated' and $context->contextlevel == CONTEXT_COURSE) {
 648         // Backup files that were generated by the automated backup systems.
 649
 650         require_login($course);
 651         require_capability('moodle/site:config', $context);
 652
 653         $filename = array_pop($args);
 654         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 655         if (!$file = $fs->get_file($context->id, 'backup', 'automated', 0, $filepath, $filename) or $file->is_directory()) {
 656             send_file_not_found();
 657         }
 658
 659         session_get_instance()->write_close(); // unlock session during fileserving
 660         send_stored_file($file, 0, 0, $forcedownload);
 661
 662     } else {
 663         send_file_not_found();
 664     }
 665
 666 // ========================================================================================================================
 667 } else if ($component === 'question') {
 668     require_once($CFG->libdir . '/questionlib.php');
 669     question_pluginfile($course, $context, 'question', $filearea, $args, $forcedownload);
 670     send_file_not_found();
 671
 672 // ========================================================================================================================
 673 } else if (strpos($component, 'mod_') === 0) {
 674     $modname = substr($component, 4);
 675     if (!file_exists("$CFG->dirroot/mod/$modname/lib.php")) {
 676         send_file_not_found();
 677     }
 678     require_once("$CFG->dirroot/mod/$modname/lib.php");
 679
 680     if ($context->contextlevel == CONTEXT_MODULE) {
 681         if ($cm->modname !== $modname) {
 682             // somebody tries to gain illegal access, cm type must match the component!
 683             send_file_not_found();
 684         }
 685     }
 686
 687     if ($filearea === 'intro') {
 688         if (!plugin_supports('mod', $modname, FEATURE_MOD_INTRO, true)) {
 689             send_file_not_found();
 690         }
 691         require_course_login($course, true, $cm);
 692
 693         // all users may access it
 694         $filename = array_pop($args);
 695         $filepath = $args ? '/'.implode('/', $args).'/' : '/';
 696         if (!$file = $fs->get_file($context->id, 'mod_'.$modname, 'intro', 0, $filepath, $filename) or $file->is_directory()) {
 697             send_file_not_found();
 698         }
 699
 700         $lifetime = isset($CFG->filelifetime) ? $CFG->filelifetime : 86400;
 701
 702         // finally send the file
 703         send_stored_file($file, $lifetime, 0);
 704     }
 705
 706     $filefunction = $component.'_pluginfile';
 707     $filefunctionold = $modname.'_pluginfile';
 708     if (function_exists($filefunction)) {
 709         // if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
 710         $filefunction($course, $cm, $context, $filearea, $args, $forcedownload);
 711     } else if (function_exists($filefunctionold)) {
 712         // if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
 713         $filefunctionold($course, $cm, $context, $filearea, $args, $forcedownload);
 714     }
 715
 716     send_file_not_found();
 717
 718 // ========================================================================================================================
 719 } else if (strpos($component, 'block_') === 0) {
 720     $blockname = substr($component, 6);
 721     // note: no more class methods in blocks please, that is ....
 722     if (!file_exists("$CFG->dirroot/blocks/$blockname/lib.php")) {
 723         send_file_not_found();
 724     }
 725     require_once("$CFG->dirroot/blocks/$blockname/lib.php");
 726
 727     if ($context->contextlevel == CONTEXT_BLOCK) {
 728         $birecord = $DB->get_record('block_instances', array('id'=>$context->instanceid), '*',MUST_EXIST);
 729         if ($birecord->blockname !== $blockname) {
 730             // somebody tries to gain illegal access, cm type must match the component!
 731             send_file_not_found();
 732         }
 733     } else {
 734         $birecord = null;
 735     }
 736
 737     $filefunction = $component.'_pluginfile';
 738     if (function_exists($filefunction)) {
 739         // if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
 740         $filefunction($course, $birecord, $context, $filearea, $args, $forcedownload);
 741     }
 742
 743     send_file_not_found();
 744
 745 } else if (strpos($component, '_') === false) {
 746     // all core subsystems have to be specified above, no more guessing here!
 747     send_file_not_found();
 748
 749 } else {
 750     // try to serve general plugin file in arbitrary context
 751     $dir = get_component_directory($component);
 752     if (!file_exists("$dir/lib.php")) {
 753         send_file_not_found();
 754     }
 755     include_once("$dir/lib.php");
 756
 757     $filefunction = $component.'_pluginfile';
 758     if (function_exists($filefunction)) {
 759         // if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
 760         $filefunction($course, $cm, $context, $filearea, $args, $forcedownload);
 761     }
 762
 763     send_file_not_found();
 764 }