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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* This script delegates file serving to individual plugins
*
* @package core
* @subpackage file
* @copyright 2008 Petr Skoda (http://skodak.org)
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
// disable moodle specific debug messages and any errors in output
//define('NO_DEBUG_DISPLAY', true);
//TODO: uncomment this once the file api stabilises a bit more
require_once('config.php');
require_once('lib/filelib.php');
$relativepath = get_file_argument();
$forcedownload = optional_param('forcedownload', 0, PARAM_BOOL);
// relative path must start with '/'
if (!$relativepath) {
print_error('invalidargorconf');
} else if ($relativepath[0] != '/') {
print_error('pathdoesnotstartslash');
}
// extract relative path components
$args = explode('/', ltrim($relativepath, '/'));
if (count($args) < 3) { // always at least context, component and filearea
print_error('invalidarguments');
}
$contextid = (int)array_shift($args);
$component = clean_param(array_shift($args), PARAM_SAFEDIR);
$filearea = clean_param(array_shift($args), PARAM_SAFEDIR);
list($context, $course, $cm) = get_context_info_array($contextid);
$fs = get_file_storage();
// If the file is a Flash file and that the user flash player is outdated return a flash upgrader MDL-20841
$mimetype = mimeinfo('type', $args[count($args)-1]);
if (!empty($CFG->excludeoldflashclients) && $mimetype == 'application/x-shockwave-flash'&& !empty($SESSION->flashversion)) {
$userplayerversion = explode('.', $SESSION->flashversion);
$requiredplayerversion = explode('.', $CFG->excludeoldflashclients);
if (($userplayerversion[0] < $requiredplayerversion[0]) ||
($userplayerversion[0] == $requiredplayerversion[0] && $userplayerversion[1] < $requiredplayerversion[1]) ||
($userplayerversion[0] == $requiredplayerversion[0] && $userplayerversion[1] == $requiredplayerversion[1]
&& $userplayerversion[2] < $requiredplayerversion[2])) {
$path = $CFG->dirroot."/lib/flashdetect/flashupgrade.swf"; // Alternate content asking user to upgrade Flash
$filename = "flashupgrade.swf";
send_file($path, $filename, O, 0, false, false, 'application/x-shockwave-flash'); // Do not cache
}
}
// ========================================================================================================================
if ($component === 'blog') {
// Blog file serving
if ($context->contextlevel != CONTEXT_SYSTEM) {
send_file_not_found();
}
if ($filearea !== 'attachment' and $filearea !== 'post') {
send_file_not_found();
}
if (empty($CFG->bloglevel)) {
print_error('siteblogdisable', 'blog');
}
if ($CFG->bloglevel < BLOG_GLOBAL_LEVEL) {
require_login();
if (isguestuser()) {
print_error('noguest');
}
if ($CFG->bloglevel == BLOG_USER_LEVEL) {
if ($USER->id != $entry->userid) {
send_file_not_found();
}
}
}
$entryid = (int)array_shift($args);
if (!$entry = $DB->get_record('post', array('module'=>'blog', 'id'=>$entryid))) {
send_file_not_found();
}
if ('publishstate' === 'public') {
if ($CFG->forcelogin) {
require_login();
}
} else if ('publishstate' === 'site') {
require_login();
//ok
} else if ('publishstate' === 'draft') {
require_login();
if ($USER->id != $entry->userid) {
send_file_not_found();
}
}
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, $component, $filearea, $entryid, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
send_stored_file($file, 10*60, 0, true); // download MUST be forced - security!
// ========================================================================================================================
} else if ($component === 'grade') {
if (($filearea === 'outcome' or $filearea === 'scale') and $context->contextlevel == CONTEXT_SYSTEM) {
// Global gradebook files
if ($CFG->forcelogin) {
require_login();
}
$fullpath = "/$context->id/$component/$filearea/".implode('/', $args);
if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
send_file_not_found();
}
session_get_instance()->write_close(); // unlock session during fileserving
send_stored_file($file, 60*60, 0, $forcedownload);
} else if ($filearea === 'feedback' and $context->contextlevel == CONTEXT_COURSE) {
//TODO: nobody implemented this yet in grade edit form!!
send_file_not_found();
if ($CFG->forcelogin || $course->id != SITEID) {
require_login($course);
}
$fullpath = "/$context->id/$component/$filearea/".implode('/', $args);
if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
send_file_not_found();
}
session_get_instance()->write_close(); // unlock session during fileserving
send_stored_file($file, 60*60, 0, $forcedownload);
} else {
send_file_not_found();
}
// ========================================================================================================================
} else if ($component === 'tag') {
if ($filearea === 'description' and $context->contextlevel == CONTEXT_SYSTEM) {
// All tag descriptions are going to be public but we still need to respect forcelogin
if ($CFG->forcelogin) {
require_login();
}
$fullpath = "/$context->id/tag/description/".implode('/', $args);
if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
send_file_not_found();
}
session_get_instance()->write_close(); // unlock session during fileserving
send_stored_file($file, 60*60, 0, true);
} else {
send_file_not_found();
}
// ========================================================================================================================
} else if ($component === 'calendar') {
if ($filearea === 'event_description' and $context->contextlevel == CONTEXT_SYSTEM) {
// All events here are public the one requirement is that we respect forcelogin
if ($CFG->forcelogin) {
require_login();
}
// Get the event if from the args array
$eventid = array_shift($args);
// Load the event from the database
if (!$event = $DB->get_record('event', array('id'=>(int)$eventid, 'eventtype'=>'site'))) {
send_file_not_found();
}
// Check that we got an event and that it's userid is that of the user
// Get the file and serve if successful
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, $component, $filearea, $eventid, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
session_get_instance()->write_close(); // unlock session during fileserving
send_stored_file($file, 60*60, 0, $forcedownload);
} else if ($filearea === 'event_description' and $context->contextlevel == CONTEXT_USER) {
// Must be logged in, if they are not then they obviously can't be this user
require_login();
// Don't want guests here, potentially saves a DB call
if (isguestuser()) {
send_file_not_found();
}
// Get the event if from the args array
$eventid = array_shift($args);
// Load the event from the database - user id must match
if (!$event = $DB->get_record('event', array('id'=>(int)$eventid, 'userid'=>$USER->id, 'eventtype'=>'user'))) {
send_file_not_found();
}
// Get the file and serve if successful
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, $component, $filearea, $eventid, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
session_get_instance()->write_close(); // unlock session during fileserving
send_stored_file($file, 60*60, 0, $forcedownload);
} else if ($filearea === 'event_description' and $context->contextlevel == CONTEXT_COURSE) {
// Respect forcelogin and require login unless this is the site.... it probably
// should NEVER be the site
if ($CFG->forcelogin || $course->id != SITEID) {
require_login($course);
}
// Must be able to at least view the course
if (!is_enrolled($context) and !is_viewing($context)) {
//TODO: hmm, do we really want to block guests here?
send_file_not_found();
}
// Get the event id
$eventid = array_shift($args);
// Load the event from the database we need to check whether it is
// a) valid course event
// b) a group event
// Group events use the course context (there is no group context)
if (!$event = $DB->get_record('event', array('id'=>(int)$eventid, 'courseid'=>$course->id))) {
send_file_not_found();
}
// If its a group event require either membership of view all groups capability
if ($event->eventtype === 'group') {
if (!has_capability('moodle/site:accessallgroups', $context) && !groups_is_member($event->groupid, $USER->id)) {
send_file_not_found();
}
} else if ($event->eventtype === 'course') {
//ok
} else {
// some other type
send_file_not_found();
}
// If we get this far we can serve the file
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, $component, $filearea, $eventid, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
session_get_instance()->write_close(); // unlock session during fileserving
send_stored_file($file, 60*60, 0, $forcedownload);
} else {
send_file_not_found();
}
// ========================================================================================================================
} else if ($component === 'user') {
if ($filearea === 'icon' and $context->contextlevel == CONTEXT_USER) {
$redirect = false;
if (count($args) == 1) {
$themename = theme_config::DEFAULT_THEME;
$filename = array_shift($args);
} else {
$themename = array_shift($args);
$filename = array_shift($args);
}
if ((!empty($CFG->forcelogin) and !isloggedin()) ||
(!empty($CFG->forceloginforprofileimage) && (!isloggedin() || isguestuser()))) {
// protect images if login required and not logged in;
// also if login is required for profile images and is not logged in or guest
// do not use require_login() because it is expensive and not suitable here anyway
$redirect = true;
}
if (!$redirect and ($filename !== 'f1' and $filename !== 'f2')) {
$filename = 'f1';
$redirect = true;
}
if (!$redirect && !$file = $fs->get_file($context->id, 'user', 'icon', 0, '/', $filename.'/.png')) {
if (!$file = $fs->get_file($context->id, 'user', 'icon', 0, '/', $filename.'/.jpg')) {
$redirect = true;
}
}
if ($redirect) {
$theme = theme_config::load($themename);
redirect($theme->pix_url('u/'.$filename, 'moodle'));
}
send_stored_file($file, 60*60*24); // enable long caching, there are many images on each page
} else if ($filearea === 'private' and $context->contextlevel == CONTEXT_USER) {
require_login();
if (isguestuser()) {
send_file_not_found();
}
if ($USER->id !== $context->instanceid) {
send_file_not_found();
}
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, $component, $filearea, 0, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
session_get_instance()->write_close(); // unlock session during fileserving
send_stored_file($file, 0, 0, true); // must force download - security!
} else if ($filearea === 'profile' and $context->contextlevel == CONTEXT_USER) {
if ($CFG->forcelogin) {
require_login();
}
$userid = $context->instanceid;
if ($USER->id == $userid) {
// always can access own
} else if (!empty($CFG->forceloginforprofiles)) {
require_login();
if (isguestuser()) {
send_file_not_found();
}
// we allow access to site profile of all course contacts (usually teachers)
if (!has_coursecontact_role($userid) && !has_capability('moodle/user:viewdetails', $context)) {
send_file_not_found();
}
$canview = false;
if (has_capability('moodle/user:viewdetails', $context)) {
$canview = true;
} else {
$courses = enrol_get_my_courses();
}
while (!$canview && count($courses) > 0) {
$course = array_shift($courses);
if (has_capability('moodle/user:viewdetails', get_context_instance(CONTEXT_COURSE, $course->id))) {
$canview = true;
}
}
}
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, $component, $filearea, 0, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
session_get_instance()->write_close(); // unlock session during fileserving
send_stored_file($file, 0, 0, true); // must force download - security!
} else if ($filearea === 'profile' and $context->contextlevel == CONTEXT_COURSE) {
$userid = (int)array_shift($args);
$usercontext = get_context_instance(CONTEXT_USER, $userid);
if ($CFG->forcelogin) {
require_login();
}
if (!empty($CFG->forceloginforprofiles)) {
require_login();
if (isguestuser()) {
print_error('noguest');
}
//TODO: review this logic of user profile access prevention
if (!has_coursecontact_role($userid) and !has_capability('moodle/user:viewdetails', $usercontext)) {
print_error('usernotavailable');
}
if (!has_capability('moodle/user:viewdetails', $context) && !has_capability('moodle/user:viewdetails', $usercontext)) {
print_error('cannotviewprofile');
}
if (!is_enrolled($context, $userid)) {
print_error('notenrolledprofile');
}
if (groups_get_course_groupmode($course) == SEPARATEGROUPS and !has_capability('moodle/site:accessallgroups', $context)) {
print_error('groupnotamember');
}
}
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($usercontext->id, 'user', 'profile', 0, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
session_get_instance()->write_close(); // unlock session during fileserving
send_stored_file($file, 0, 0, true); // must force download - security!
} else if ($filearea === 'backup' and $context->contextlevel == CONTEXT_USER) {
require_login();
if (isguestuser()) {
send_file_not_found();
}
$userid = $context->instanceid;
if ($USER->id != $userid) {
send_file_not_found();
}
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'user', 'backup', 0, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
session_get_instance()->write_close(); // unlock session during fileserving
send_stored_file($file, 0, 0, true); // must force download - security!
} else {
send_file_not_found();
}
// ========================================================================================================================
} else if ($component === 'coursecat') {
if ($context->contextlevel != CONTEXT_COURSECAT) {
send_file_not_found();
}
if ($filearea === 'description') {
if ($CFG->forcelogin) {
// no login necessary - unless login forced everywhere
require_login();
}
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'coursecat', 'description', 0, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
session_get_instance()->write_close(); // unlock session during fileserving
send_stored_file($file, 60*60, 0, $forcedownload);
} else {
send_file_not_found();
}
// ========================================================================================================================
} else if ($component === 'course') {
if ($context->contextlevel != CONTEXT_COURSE) {
send_file_not_found();
}
if ($filearea === 'summary') {
if ($CFG->forcelogin) {
require_login();
}
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'course', 'summary', 0, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
session_get_instance()->write_close(); // unlock session during fileserving
send_stored_file($file, 60*60, 0, $forcedownload);
} else if ($filearea === 'section') {
if ($CFG->forcelogin) {
require_login($course);
} else if ($course->id != SITEID) {
require_login($course);
}
$sectionid = (int)array_shift($args);
if (!$section = $DB->get_record('course_sections', array('id'=>$sectionid, 'course'=>$course->id))) {
send_file_not_found();
}
if ($course->numsections < $section->section) {
if (!has_capability('moodle/course:update', $context)) {
// block access to unavailable sections if can not edit course
send_file_not_found();
}
}
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'course', 'section', $sectionid, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
session_get_instance()->write_close(); // unlock session during fileserving
send_stored_file($file, 60*60, 0, $forcedownload);
} else {
send_file_not_found();
}
} else if ($component === 'group') {
if ($context->contextlevel != CONTEXT_COURSE) {
send_file_not_found();
}
require_course_login($course, true, null, false);
$groupid = (int)array_shift($args);
$group = $DB->get_record('groups', array('id'=>$groupid, 'courseid'=>$course->id), '*', MUST_EXIST);
if (($course->groupmodeforce and $course->groupmode == SEPARATEGROUPS) and !has_capability('moodle/site:accessallgroups', $context) and !groups_is_member($group->id, $USER->id)) {
// do not allow access to separate group info if not member or teacher
send_file_not_found();
}
if ($filearea === 'description') {
require_login($course);
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'group', 'description', $group->id, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
session_get_instance()->write_close(); // unlock session during fileserving
send_stored_file($file, 60*60, 0, $forcedownload);
} else if ($filearea === 'icon') {
$filename = array_pop($args);
if ($filename !== 'f1' and $filename !== 'f2') {
send_file_not_found();
}
if (!$file = $fs->get_file($context->id, 'group', 'icon', $group->id, '/', $filename.'.png')) {
if (!$file = $fs->get_file($context->id, 'group', 'icon', $group->id, '/', $filename.'.jpg')) {
send_file_not_found();
}
}
session_get_instance()->write_close(); // unlock session during fileserving
send_stored_file($file, 60*60);
} else {
send_file_not_found();
}
} else if ($component === 'grouping') {
if ($context->contextlevel != CONTEXT_COURSE) {
send_file_not_found();
}
require_login($course);
$groupingid = (int)array_shift($args);
// note: everybody has access to grouping desc images for now
if ($filearea === 'description') {
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'grouping', 'description', $groupingid, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
session_get_instance()->write_close(); // unlock session during fileserving
send_stored_file($file, 60*60, 0, $forcedownload);
} else {
send_file_not_found();
}
// ========================================================================================================================
} else if ($component === 'backup') {
if ($filearea === 'course' and $context->contextlevel == CONTEXT_COURSE) {
require_login($course);
require_capability('moodle/backup:downloadfile', $context);
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'backup', 'course', 0, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
session_get_instance()->write_close(); // unlock session during fileserving
send_stored_file($file, 0, 0, $forcedownload);
} else if ($filearea === 'section' and $context->contextlevel == CONTEXT_COURSE) {
require_login($course);
require_capability('moodle/backup:downloadfile', $context);
$sectionid = (int)array_shift($args);
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'backup', 'section', $sectionid, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
session_get_instance()->write_close();
send_stored_file($file, 60*60, 0, $forcedownload);
} else if ($filearea === 'activity' and $context->contextlevel == CONTEXT_MODULE) {
require_login($course, false, $cm);
require_capability('moodle/backup:downloadfile', $context);
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'backup', 'activity', 0, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
session_get_instance()->write_close();
send_stored_file($file, 60*60, 0, $forcedownload);
} else if ($filearea === 'automated' and $context->contextlevel == CONTEXT_COURSE) {
// Backup files that were generated by the automated backup systems.
require_login($course);
require_capability('moodle/site:config', $context);
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'backup', 'automated', 0, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
session_get_instance()->write_close(); // unlock session during fileserving
send_stored_file($file, 0, 0, $forcedownload);
} else {
send_file_not_found();
}
// ========================================================================================================================
} else if ($component === 'question') {
require_once($CFG->libdir . '/questionlib.php');
question_pluginfile($course, $context, 'question', $filearea, $args, $forcedownload);
send_file_not_found();
// ========================================================================================================================
} else if (strpos($component, 'mod_') === 0) {
$modname = substr($component, 4);
if (!file_exists("$CFG->dirroot/mod/$modname/lib.php")) {
send_file_not_found();
}
require_once("$CFG->dirroot/mod/$modname/lib.php");
if ($context->contextlevel == CONTEXT_MODULE) {
if ($cm->modname !== $modname) {
// somebody tries to gain illegal access, cm type must match the component!
send_file_not_found();
}
}
if ($filearea === 'intro') {
if (!plugin_supports('mod', $modname, FEATURE_MOD_INTRO, true)) {
send_file_not_found();
}
require_course_login($course, true, $cm);
// all users may access it
$filename = array_pop($args);
$filepath = $args ? '/'.implode('/', $args).'/' : '/';
if (!$file = $fs->get_file($context->id, 'mod_'.$modname, 'intro', 0, $filepath, $filename) or $file->is_directory()) {
send_file_not_found();
}
$lifetime = isset($CFG->filelifetime) ? $CFG->filelifetime : 86400;
// finally send the file
send_stored_file($file, $lifetime, 0);
}
$filefunction = $component.'_pluginfile';
$filefunctionold = $modname.'_pluginfile';
if (function_exists($filefunction)) {
// if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
$filefunction($course, $cm, $context, $filearea, $args, $forcedownload);
} else if (function_exists($filefunctionold)) {
// if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
$filefunctionold($course, $cm, $context, $filearea, $args, $forcedownload);
}
send_file_not_found();
// ========================================================================================================================
} else if (strpos($component, 'block_') === 0) {
$blockname = substr($component, 6);
// note: no more class methods in blocks please, that is ....
if (!file_exists("$CFG->dirroot/blocks/$blockname/lib.php")) {
send_file_not_found();
}
require_once("$CFG->dirroot/blocks/$blockname/lib.php");
if ($context->contextlevel == CONTEXT_BLOCK) {
$birecord = $DB->get_record('block_instances', array('id'=>$context->instanceid), '*',MUST_EXIST);
if ($birecord->blockname !== $blockname) {
// somebody tries to gain illegal access, cm type must match the component!
send_file_not_found();
}
} else {
$birecord = null;
}
$filefunction = $component.'_pluginfile';
if (function_exists($filefunction)) {
// if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
$filefunction($course, $birecord, $context, $filearea, $args, $forcedownload);
}
send_file_not_found();
} else if (strpos($component, '_') === false) {
// all core subsystems have to be specified above, no more guessing here!
send_file_not_found();
} else {
// try to serve general plugin file in arbitrary context
$dir = get_component_directory($component);
if (!file_exists("$dir/lib.php")) {
send_file_not_found();
}
include_once("$dir/lib.php");
$filefunction = $component.'_pluginfile';
if (function_exists($filefunction)) {
// if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
$filefunction($course, $cm, $context, $filearea, $args, $forcedownload);
}
send_file_not_found();
}
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