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<?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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* X-Sendfile support
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*
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* @package core
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* @copyright 2012 Petr Skoda {@link 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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/**
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* Serve files using the X-Sendfile header.
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*
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* This needs special server module or configuration.
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* Please make sure that all headers are already sent and the all access control checks passed.
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*
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* @param string $filepath
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* @return bool success
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*/
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function xsendfile($filepath) {
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global $CFG;
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if (empty($CFG->xsendfile)) {
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return false;
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}
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if (!file_exists($filepath)) {
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return false;
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}
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if (headers_sent()) {
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return false;
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}
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$filepath = realpath($filepath);
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$localrequestdir = realpath($CFG->localrequestdir);
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if (str_contains($filepath, $localrequestdir)) {
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// Do not serve files from local request directory using xsendfile.
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// They are likely to be removed before xsendfile can serve them.
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return false;
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}
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$aliased = false;
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if (!empty($CFG->xsendfilealiases) && is_array($CFG->xsendfilealiases)) {
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foreach ($CFG->xsendfilealiases as $alias => $dir) {
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$dir = realpath($dir);
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if ($dir === false) {
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continue;
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}
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if (substr($dir, -1) !== DIRECTORY_SEPARATOR) {
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// Add trailing dir separator.
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$dir .= DIRECTORY_SEPARATOR;
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}
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if (str_starts_with($filepath, $dir)) {
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$filepath = $alias . substr($filepath, strlen($dir));
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$aliased = true;
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break;
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}
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}
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}
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if ($CFG->xsendfile === 'X-LIGHTTPD-send-file') {
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// Version 1.4.40 and earlier do not support byte serving.
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// See http://redmine.lighttpd.net/projects/lighttpd/wiki/X-LIGHTTPD-send-file for more information.
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header('Accept-Ranges: none');
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} else if ($CFG->xsendfile === 'X-Accel-Redirect') {
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// Nginx requires paths relative to aliases, you need to specify them in config.php
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// See http://wiki.nginx.org/XSendfile for more information.
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if (!$aliased) {
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return false;
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}
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}
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header("$CFG->xsendfile: $filepath");
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return true;
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}
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