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xsendfilelib.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/>.
/**
* X-Sendfile support
*
* @package core_files
* @copyright 2012 Petr Skoda {@link http://skodak.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
//NOTE: do not verify MOODLE_INTERNAL here, this is used from themes too
/**
* Serve file using X-Sendfile header, this needs special server module
* or configuration. Please make sure that all headers are already sent
* and the all access control checks passed.
*
* @param string $filepath
* @return bool success
*/
function xsendfile($filepath) {
global $CFG;
if (empty($CFG->xsendfile)) {
return false;
}
if (!file_exists($filepath)) {
return false;
}
if (headers_sent()) {
return false;
}
$filepath = realpath($filepath);
$aliased = false;
if (!empty($CFG->xsendfilealiases) and is_array($CFG->xsendfilealiases)) {
foreach ($CFG->xsendfilealiases as $alias=>$dir) {
$dir = realpath($dir);
if ($dir === false) {
continue;
}
if (substr($dir, -1) !== DIRECTORY_SEPARATOR) {
// add trailing dir separator
$dir .= DIRECTORY_SEPARATOR;
}
if (strpos($filepath, $dir) === 0) {
$filepath = $alias.substr($filepath, strlen($dir));
$aliased = true;
break;
}
}
}
if ($CFG->xsendfile === 'X-LIGHTTPD-send-file') {
// http://redmine.lighttpd.net/projects/lighttpd/wiki/X-LIGHTTPD-send-file says 1.4 it does not support byteserving
header('Accept-Ranges: none');
} else if ($CFG->xsendfile === 'X-Accel-Redirect') {
// http://wiki.nginx.org/XSendfile
// Nginx requires paths relative to aliases, you need to specify them in config.php
if (!$aliased) {
return false;
}
}
header("$CFG->xsendfile: $filepath");
return true;
}