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pluginfile.php
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pluginfile.php
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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 moodlecore
* @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);
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) == 0) { // always at least user id
print_error('invalidarguments');
}
$contextid = (int)array_shift($args);
$filearea = array_shift($args);
if (!$context = get_context_instance_by_id($contextid)) {
send_file_not_found();
}
$fs = get_file_storage();
if ($context->contextlevel == CONTEXT_SYSTEM) {
if ($filearea === 'blog_attachment' || $filearea === 'blog_post') {
if (empty($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();
}
}
//TODO: implement shared course and shared group access
$relativepath = '/'.implode('/', $args);
$fullpath = $context->id.$filearea.$entryid.$relativepath;
if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
send_file_not_found();
}
send_stored_file($file, 10*60, 0, true); // download MUST be forced - security!
} else if ($filearea === 'grade_outcome' || $filearea === 'grade_scale') { // CONTEXT_SYSTEM
if ($CFG->forcelogin) {
require_login();
}
$fullpath = $context->id.$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, $forcedownload); // TODO: change timeout?
} else if ($filearea === 'tag_description') { // CONTEXT_SYSTEM
// All tag descriptions are going to be public but we still need to respect forcelogin
if ($CFG->forcelogin) {
require_login();
}
$fullpath = $context->id.$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, true); // TODO: change timeout?
} else if ($filearea === 'calendar_event_description') { // CONTEXT_SYSTEM
// All events here are public the one requirement is that we respect forcelogin
if ($CFG->forcelogin) {
require_login();
}
$fullpath = $context->id.$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, $forcedownload); // TODO: change timeout?
} else {
send_file_not_found();
}
} else if ($context->contextlevel == CONTEXT_USER) {
if ($filearea === 'calendar_event_description') { // 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);
if ((int)$eventid <= 0) {
send_file_not_found();
}
// Load the event from the database
$event = $DB->get_record('event', array('id'=>(int)$eventid));
// Check that we got an event and that it's userid is that of the user
if (!$event || $event->userid !== $USER->id) {
send_file_not_found();
}
// Get the file and serve if succesfull
$fullpath = $context->id.$filearea.$eventid.'/'.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, $forcedownload); // TODO: change timeout?
} else if ($filearea === 'user_profile') { // CONTEXT_USER
if ($CFG->forcelogin) {
require_login();
}
$userid = array_shift($args);
if ((int)$userid <= 0) {
send_file_not_found();
}
if (!empty($CFG->forceloginforprofiles)) {
require_login();
if (isguestuser()) {
send_file_not_found();
}
if ($USER->id !== $userid) {
$usercontext = get_context_instance(CONTEXT_USER, $userid);
// The browsing user is not the current user
if (!isteacherinanycourse() && !isteacherinanycourse($userid) && !has_capability('moodle/user:viewdetails', $usercontext)) {
send_file_not_found();
}
$canview = false;
if (has_capability('moodle/user:viewdetails', $usercontext)) {
$canview = true;
} else {
$courses = get_my_courses($USER->id);
}
while (!$canview && count($courses) > 0) {
$course = array_shift($courses);
if (has_capability('moodle/user:viewdetails', get_context_instance(CONTEXT_COURSE, $course->id))) {
$canview = true;
}
}
}
}
$fullpath = $context->id.$filearea.$userid.'/'.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);
}
send_file_not_found();
} else if ($context->contextlevel == CONTEXT_COURSECAT) {
if ($filearea !== 'coursecat_intro') {
send_file_not_found();
}
if ($CFG->forcelogin) {
// no login necessary - unless login forced everywhere
require_login();
}
$relativepath = '/'.implode('/', $args);
$fullpath = $context->id.'coursecat_intro0'.$relativepath;
if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->get_filename() == '.') {
send_file_not_found();
}
session_get_instance()->write_close(); // unlock session during fileserving
send_stored_file($file, 60*60, 0, $forcedownload);
} else if ($context->contextlevel == CONTEXT_COURSE) {
if (!$course = $DB->get_record('course', array('id'=>$context->instanceid))) {
print_error('invalidcourseid');
}
if ($filearea === 'course_backup') {
require_login($course);
require_capability('moodle/site:backupdownload', $context);
$relativepath = '/'.implode('/', $args);
$fullpath = $context->id.'course_backup0'.$relativepath;
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, 0, 0, true);
} else if ($filearea === 'course_intro') {
if ($CFG->forcelogin) {
require_login();
}
$relativepath = '/'.implode('/', $args);
$fullpath = $context->id.'course_intro0'.$relativepath;
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, false); // TODO: change timeout?
} else if ($filearea === 'course_summary') {
if ($CFG->forcelogin) {
require_login();
}
$fullpath = $context->id.$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, $forcedownload); // TODO: change timeout?
} else if ($filearea === 'course_grade_tree_feedback') {
if ($CFG->forcelogin || $course->id !== SITEID) {
require_login($course);
}
$fullpath = $context->id.$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, $forcedownload); // TODO: change timeout?
} else if ($filearea === 'calendar_event_description') { // CONTEXT_COURSE
// This is for content used in course and group events
// 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 (!has_capability('moodle/course:view', $context)) {
send_file_not_found();
}
// Get the event id
$eventid = array_shift($args);
if ((int)$eventid <= 0) {
send_file_not_found();
}
// Load the event from the database we need to check whether it is
// a) valid
// b) a group event
// Group events use the course context (there is no group context)
$event = $DB->get_record('event', array('id'=>(int)$eventid));
if (!$event || $event->userid !== $USER->id) {
send_file_not_found();
}
// If its a group event require either membership of manage groups capability
if ($event->eventtype === 'group' && !has_capability('moodle/course:managegroups', $context) && !groups_is_member($event->groupid, $USER->id)) {
send_file_not_found();
}
// If we get this far we can serve the file
$fullpath = $context->id.$filearea.$eventid.'/'.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, $forcedownload); // TODO: change timeout?
} else if ($filearea === 'course_section') {
if ($CFG->forcelogin) {
require_login($course);
} else if ($course->id !== SITEID) {
require_login($course);
}
$sectionid = (int)array_shift($args);
if ($course->numsections < $sectionid) {
if (!has_capability('moodle/course:update', $context)) {
// disable access to invisible sections if can not edit course
// this is going to break some ugly hacks, but is necessary
send_file_not_found();
}
}
$relativepath = '/'.implode('/', $args);
$fullpath = $context->id.'course_section'.$sectionid.$relativepath;
if (!$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, false); // TODO: change timeout?
} else if ($filearea === 'user_profile') {
$userid = (int)array_shift($args);
$usercontext = get_context_instance(CONTEXT_USER, $userid);
if (!empty($CFG->forceloginforprofiles)) {
require_login();
if (isguestuser()) {
print_error('noguest');
}
if (!isteacherinanycourse()
and !isteacherinanycourse($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 (!has_capability('moodle/course:view', $context, $userid, false)) {
print_error('notenrolledprofile');
}
if (groups_get_course_groupmode($course) == SEPARATEGROUPS and !has_capability('moodle/site:accessallgroups', $context)) {
print_error('groupnotamember');
}
}
$relativepath = '/'.implode('/', $args);
$fullpath = $usercontext->id.'user_profile0'.$relativepath;
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, 0, 0, true); // must force download - security!
} else {
send_file_not_found();
}
} else if ($context->contextlevel == CONTEXT_MODULE) {
if (!$coursecontext = get_context_instance_by_id(get_parent_contextid($context))) {
send_file_not_found();
}
if (!$course = $DB->get_record('course', array('id'=>$coursecontext->instanceid))) {
send_file_not_found();
}
$modinfo = get_fast_modinfo($course);
if (empty($modinfo->cms[$context->instanceid])) {
send_file_not_found();
}
$cminfo = $modinfo->cms[$context->instanceid];
$modname = $cminfo->modname;
$libfile = "$CFG->dirroot/mod/$modname/lib.php";
if (!file_exists($libfile)) {
send_file_not_found();
}
require_once($libfile);
if ($filearea === $modname.'_intro') {
if (!plugin_supports('mod', $modname, FEATURE_MOD_INTRO, true)) {
send_file_not_found();
}
if (!$cm = get_coursemodule_from_instance($modname, $cminfo->instance, $course->id)) {
send_file_not_found();
}
require_course_login($course, true, $cm);
if (!$cminfo->uservisible) {
send_file_not_found();
}
// all users may access it
$relativepath = '/'.implode('/', $args);
$fullpath = $context->id.$filearea.'0'.$relativepath;
$fs = get_file_storage();
if (!$file = $fs->get_file_by_hash(sha1($fullpath)) 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 = $modname.'_pluginfile';
if (function_exists($filefunction)) {
// if the function exists, it must send the file and terminate. Whatever it returns leads to "not found"
$filefunction($course, $cminfo, $context, $filearea, $args, $forcedownload);
}
send_file_not_found();
} else if ($context->contextlevel == CONTEXT_BLOCK) {
//not supported yet
send_file_not_found();
} else {
send_file_not_found();
}