mirror of
https://github.com/moodle/moodle.git
synced 2025-01-18 22:08:20 +01:00
518 lines
18 KiB
PHP
518 lines
18 KiB
PHP
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* This script delegates file serving to individual plugins
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*
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* @package moodlecore
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* @subpackage file
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* @copyright 2008 Petr Skoda (http://skodak.org)
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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// disable moodle specific debug messages and any errors in output
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define('NO_DEBUG_DISPLAY', true);
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require_once('config.php');
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require_once('lib/filelib.php');
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$relativepath = get_file_argument();
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$forcedownload = optional_param('forcedownload', 0, PARAM_BOOL);
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// relative path must start with '/'
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if (!$relativepath) {
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print_error('invalidargorconf');
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} else if ($relativepath[0] != '/') {
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print_error('pathdoesnotstartslash');
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}
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// extract relative path components
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$args = explode('/', ltrim($relativepath, '/'));
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if (count($args) == 0) { // always at least user id
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print_error('invalidarguments');
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}
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$contextid = (int)array_shift($args);
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$filearea = array_shift($args);
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if (!$context = get_context_instance_by_id($contextid)) {
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send_file_not_found();
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}
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$fs = get_file_storage();
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// If the file is a Flash file and that the user flash player is outdated return a flash upgrader MDL-20841
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$mimetype = mimeinfo('type', $args[count($args)-1]);
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if (!empty($CFG->excludeoldflashclients) && $mimetype == 'application/x-shockwave-flash'&& !empty($SESSION->flashversion)) {
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$userplayerversion = explode('.', $SESSION->flashversion);
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$requiredplayerversion = explode('.', $CFG->excludeoldflashclients);
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$sendflashupgrader = true;
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}
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if (!empty($sendflashupgrader) && (($userplayerversion[0] < $requiredplayerversion[0]) ||
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($userplayerversion[0] == $requiredplayerversion[0] && $userplayerversion[1] < $requiredplayerversion[1]) ||
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($userplayerversion[0] == $requiredplayerversion[0] && $userplayerversion[1] == $requiredplayerversion[1]
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&& $userplayerversion[2] < $requiredplayerversion[2]))) {
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$path = $CFG->dirroot."/lib/flashdetect/flashupgrade.swf"; // Alternate content asking user to upgrade Flash
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$filename = "flashupgrade.swf";
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$lifetime = 0; // Do not cache
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send_file($path, $filename, $lifetime, 0, false, false, $mimetype);
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} else if ($context->contextlevel == CONTEXT_SYSTEM) {
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if ($filearea === 'blog_attachment' || $filearea === 'blog_post') {
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if (empty($CFG->bloglevel)) {
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print_error('siteblogdisable', 'blog');
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}
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if ($CFG->bloglevel < BLOG_GLOBAL_LEVEL) {
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require_login();
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if (isguestuser()) {
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print_error('noguest');
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}
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if ($CFG->bloglevel == BLOG_USER_LEVEL) {
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if ($USER->id != $entry->userid) {
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send_file_not_found();
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}
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}
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}
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$entryid = (int)array_shift($args);
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if (!$entry = $DB->get_record('post', array('module'=>'blog', 'id'=>$entryid))) {
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send_file_not_found();
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}
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if ('publishstate' === 'public') {
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if ($CFG->forcelogin) {
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require_login();
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}
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} else if ('publishstate' === 'site') {
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require_login();
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//ok
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} else if ('publishstate' === 'draft') {
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require_login();
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if ($USER->id != $entry->userid) {
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send_file_not_found();
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}
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}
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//TODO: implement shared course and shared group access
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$relativepath = '/'.implode('/', $args);
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$fullpath = $context->id.$filearea.$entryid.$relativepath;
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if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
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send_file_not_found();
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}
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send_stored_file($file, 10*60, 0, true); // download MUST be forced - security!
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} else if ($filearea === 'grade_outcome' || $filearea === 'grade_scale') { // CONTEXT_SYSTEM
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if ($CFG->forcelogin) {
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require_login();
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}
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$fullpath = $context->id.$filearea.implode('/', $args);
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if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
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send_file_not_found();
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}
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session_get_instance()->write_close(); // unlock session during fileserving
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send_stored_file($file, 60*60, 0, $forcedownload); // TODO: change timeout?
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} else if ($filearea === 'tag_description') { // CONTEXT_SYSTEM
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// All tag descriptions are going to be public but we still need to respect forcelogin
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if ($CFG->forcelogin) {
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require_login();
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}
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$fullpath = $context->id.$filearea.implode('/', $args);
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if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
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send_file_not_found();
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}
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session_get_instance()->write_close(); // unlock session during fileserving
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send_stored_file($file, 60*60, 0, true); // TODO: change timeout?
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} else if ($filearea === 'calendar_event_description') { // CONTEXT_SYSTEM
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// All events here are public the one requirement is that we respect forcelogin
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if ($CFG->forcelogin) {
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require_login();
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}
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$fullpath = $context->id.$filearea.implode('/', $args);
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if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
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send_file_not_found();
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}
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session_get_instance()->write_close(); // unlock session during fileserving
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send_stored_file($file, 60*60, 0, $forcedownload); // TODO: change timeout?
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} else {
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send_file_not_found();
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}
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} else if ($context->contextlevel == CONTEXT_USER) {
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if ($filearea === 'calendar_event_description') { // CONTEXT_USER
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// Must be logged in, if they are not then they obviously can't be this user
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require_login();
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// Don't want guests here, potentially saves a DB call
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if (isguestuser()) {
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send_file_not_found();
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}
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// Get the event if from the args array
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$eventid = array_shift($args);
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if ((int)$eventid <= 0) {
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send_file_not_found();
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}
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// Load the event from the database
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$event = $DB->get_record('event', array('id'=>(int)$eventid));
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// Check that we got an event and that it's userid is that of the user
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if (!$event || $event->userid !== $USER->id) {
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send_file_not_found();
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}
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// Get the file and serve if succesfull
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$fullpath = $context->id.$filearea.$eventid.'/'.implode('/', $args);
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if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
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send_file_not_found();
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}
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session_get_instance()->write_close(); // unlock session during fileserving
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send_stored_file($file, 60*60, 0, $forcedownload); // TODO: change timeout?
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} else if ($filearea === 'user_profile') { // CONTEXT_USER
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if ($CFG->forcelogin) {
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require_login();
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}
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$userid = array_shift($args);
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if ((int)$userid <= 0) {
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send_file_not_found();
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}
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if (!empty($CFG->forceloginforprofiles)) {
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require_login();
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if (isguestuser()) {
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send_file_not_found();
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}
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if ($USER->id !== $userid) {
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$usercontext = get_context_instance(CONTEXT_USER, $userid);
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// The browsing user is not the current user
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if (!isteacherinanycourse() && !isteacherinanycourse($userid) && !has_capability('moodle/user:viewdetails', $usercontext)) {
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send_file_not_found();
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}
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$canview = false;
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if (has_capability('moodle/user:viewdetails', $usercontext)) {
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$canview = true;
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} else {
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$courses = get_my_courses($USER->id);
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}
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while (!$canview && count($courses) > 0) {
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$course = array_shift($courses);
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if (has_capability('moodle/user:viewdetails', get_context_instance(CONTEXT_COURSE, $course->id))) {
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$canview = true;
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}
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}
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}
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}
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$fullpath = $context->id.$filearea.$userid.'/'.implode('/', $args);
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if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
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send_file_not_found();
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}
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session_get_instance()->write_close(); // unlock session during fileserving
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send_stored_file($file, 60*60, 0, true);
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}
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send_file_not_found();
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} else if ($context->contextlevel == CONTEXT_COURSECAT) {
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if ($filearea !== 'coursecat_intro') {
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send_file_not_found();
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}
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if ($CFG->forcelogin) {
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// no login necessary - unless login forced everywhere
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require_login();
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}
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$relativepath = '/'.implode('/', $args);
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$fullpath = $context->id.'coursecat_intro0'.$relativepath;
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if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->get_filename() == '.') {
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send_file_not_found();
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}
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session_get_instance()->write_close(); // unlock session during fileserving
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send_stored_file($file, 60*60, 0, $forcedownload);
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} else if ($context->contextlevel == CONTEXT_COURSE) {
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if (!$course = $DB->get_record('course', array('id'=>$context->instanceid))) {
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print_error('invalidcourseid');
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}
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if ($filearea === 'course_backup') {
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require_login($course);
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require_capability('moodle/backup:downloadfile', $context);
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$relativepath = '/'.implode('/', $args);
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$fullpath = $context->id.'course_backup0'.$relativepath;
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if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
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send_file_not_found();
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}
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session_get_instance()->write_close(); // unlock session during fileserving
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send_stored_file($file, 0, 0, true);
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} else if ($filearea === 'course_intro') {
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if ($CFG->forcelogin) {
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require_login();
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}
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$relativepath = '/'.implode('/', $args);
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$fullpath = $context->id.'course_intro0'.$relativepath;
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if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
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send_file_not_found();
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}
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session_get_instance()->write_close(); // unlock session during fileserving
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send_stored_file($file, 60*60, 0, false); // TODO: change timeout?
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} else if ($filearea === 'course_summary') {
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if ($CFG->forcelogin) {
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require_login();
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}
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$fullpath = $context->id.$filearea.implode('/', $args);
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if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
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send_file_not_found();
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}
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session_get_instance()->write_close(); // unlock session during fileserving
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send_stored_file($file, 60*60, 0, $forcedownload); // TODO: change timeout?
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} else if ($filearea === 'course_grade_tree_feedback') {
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if ($CFG->forcelogin || $course->id !== SITEID) {
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require_login($course);
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}
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$fullpath = $context->id.$filearea.implode('/', $args);
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if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
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send_file_not_found();
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}
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session_get_instance()->write_close(); // unlock session during fileserving
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send_stored_file($file, 60*60, 0, $forcedownload); // TODO: change timeout?
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} else if ($filearea === 'calendar_event_description') { // CONTEXT_COURSE
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// This is for content used in course and group events
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// Respect forcelogin and require login unless this is the site.... it probably
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// should NEVER be the site
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if ($CFG->forcelogin || $course->id !== SITEID) {
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require_login($course);
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}
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// Must be able to at least view the course
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if (!has_capability('moodle/course:view', $context)) {
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send_file_not_found();
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}
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// Get the event id
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$eventid = array_shift($args);
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if ((int)$eventid <= 0) {
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send_file_not_found();
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}
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// Load the event from the database we need to check whether it is
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// a) valid
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// b) a group event
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// Group events use the course context (there is no group context)
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$event = $DB->get_record('event', array('id'=>(int)$eventid));
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if (!$event || $event->userid !== $USER->id) {
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send_file_not_found();
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}
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// If its a group event require either membership of manage groups capability
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if ($event->eventtype === 'group' && !has_capability('moodle/course:managegroups', $context) && !groups_is_member($event->groupid, $USER->id)) {
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send_file_not_found();
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}
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// If we get this far we can serve the file
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$fullpath = $context->id.$filearea.$eventid.'/'.implode('/', $args);
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if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
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send_file_not_found();
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}
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session_get_instance()->write_close(); // unlock session during fileserving
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send_stored_file($file, 60*60, 0, $forcedownload); // TODO: change timeout?
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} else if ($filearea === 'course_section') {
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if ($CFG->forcelogin) {
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require_login($course);
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} else if ($course->id !== SITEID) {
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require_login($course);
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}
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$sectionid = (int)array_shift($args);
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if ($course->numsections < $sectionid) {
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if (!has_capability('moodle/course:update', $context)) {
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// disable access to invisible sections if can not edit course
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// this is going to break some ugly hacks, but is necessary
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send_file_not_found();
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}
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}
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$relativepath = '/'.implode('/', $args);
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$fullpath = $context->id.'course_section'.$sectionid.$relativepath;
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if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
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send_file_not_found();
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}
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session_get_instance()->write_close(); // unlock session during fileserving
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send_stored_file($file, 60*60, 0, false); // TODO: change timeout?
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} else if ($filearea === 'user_profile') {
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$userid = (int)array_shift($args);
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$usercontext = get_context_instance(CONTEXT_USER, $userid);
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if (!empty($CFG->forceloginforprofiles)) {
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require_login();
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if (isguestuser()) {
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print_error('noguest');
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}
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if (!isteacherinanycourse()
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and !isteacherinanycourse($userid)
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and !has_capability('moodle/user:viewdetails', $usercontext)) {
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print_error('usernotavailable');
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}
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if (!has_capability('moodle/user:viewdetails', $context) &&
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!has_capability('moodle/user:viewdetails', $usercontext)) {
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print_error('cannotviewprofile');
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}
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if (!has_capability('moodle/course:view', $context, $userid, false)) {
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print_error('notenrolledprofile');
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}
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if (groups_get_course_groupmode($course) == SEPARATEGROUPS and !has_capability('moodle/site:accessallgroups', $context)) {
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print_error('groupnotamember');
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}
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}
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$relativepath = '/'.implode('/', $args);
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$fullpath = $usercontext->id.'user_profile0'.$relativepath;
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if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
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send_file_not_found();
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}
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session_get_instance()->write_close(); // unlock session during fileserving
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send_stored_file($file, 0, 0, true); // must force download - security!
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} else {
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send_file_not_found();
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}
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} else if ($context->contextlevel == CONTEXT_MODULE) {
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if (!$coursecontext = get_context_instance_by_id(get_parent_contextid($context))) {
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send_file_not_found();
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}
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if (!$course = $DB->get_record('course', array('id'=>$coursecontext->instanceid))) {
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send_file_not_found();
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}
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$modinfo = get_fast_modinfo($course);
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if (empty($modinfo->cms[$context->instanceid])) {
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send_file_not_found();
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}
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$cminfo = $modinfo->cms[$context->instanceid];
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$modname = $cminfo->modname;
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$libfile = "$CFG->dirroot/mod/$modname/lib.php";
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if (!file_exists($libfile)) {
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send_file_not_found();
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}
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require_once($libfile);
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if ($filearea === $modname.'_intro') {
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if (!plugin_supports('mod', $modname, FEATURE_MOD_INTRO, true)) {
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send_file_not_found();
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}
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if (!$cm = get_coursemodule_from_instance($modname, $cminfo->instance, $course->id)) {
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send_file_not_found();
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}
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require_course_login($course, true, $cm);
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if (!$cminfo->uservisible) {
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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();
|
|
}
|