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<?php
/**
* Copyright (c) 2012 Bart Visscher <bartv@thisnet.nl>
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
*/
class OC_Request {
const USER_AGENT_IE = '/MSIE/';
// Android Chrome user agent: https://developers.google.com/chrome/mobile/docs/user-agent
const USER_AGENT_ANDROID_MOBILE_CHROME = '#Android.*Chrome/[.0-9]*#';
/**
* @brief Check overwrite condition
* @param string $type
* @returns bool
*/
private static function isOverwriteCondition($type = '') {
$regex = '/' . OC_Config::getValue('overwritecondaddr', '') . '/';
return $regex === '//' or preg_match($regex, $_SERVER['REMOTE_ADDR']) === 1
or ($type !== 'protocol' and OC_Config::getValue('forcessl', false));
}
/**
* @brief Returns the server host
* @returns string the server host
*
* Returns the server host, even if the website uses one or more
* reverse proxies
*/
public static function serverHost() {
if(OC::$CLI) {
return 'localhost';
}
if(OC_Config::getValue('overwritehost', '') !== '' and self::isOverwriteCondition()) {
return OC_Config::getValue('overwritehost');
}
if (isset($_SERVER['HTTP_X_FORWARDED_HOST'])) {
if (strpos($_SERVER['HTTP_X_FORWARDED_HOST'], ",") !== false) {
$host = trim(array_pop(explode(",", $_SERVER['HTTP_X_FORWARDED_HOST'])));
}
else{
$host=$_SERVER['HTTP_X_FORWARDED_HOST'];
}
}
else{
if (isset($_SERVER['HTTP_HOST'])) {
return $_SERVER['HTTP_HOST'];
}
if (isset($_SERVER['SERVER_NAME'])) {
return $_SERVER['SERVER_NAME'];
}
return 'localhost';
}
return $host;
}
/**
* @brief Returns the server protocol
* @returns string the server protocol
*
* Returns the server protocol. It respects reverse proxy servers and load balancers
*/
public static function serverProtocol() {
if(OC_Config::getValue('overwriteprotocol', '') !== '' and self::isOverwriteCondition('protocol')) {
return OC_Config::getValue('overwriteprotocol');
}
if (isset($_SERVER['HTTP_X_FORWARDED_PROTO'])) {
$proto = strtolower($_SERVER['HTTP_X_FORWARDED_PROTO']);
}else{
if(isset($_SERVER['HTTPS']) and !empty($_SERVER['HTTPS']) and ($_SERVER['HTTPS']!='off')) {
$proto = 'https';
}else{
$proto = 'http';
}
}
return $proto;
}
/**
* @brief Returns the request uri
* @returns string the request uri
*
* Returns the request uri, even if the website uses one or more
* reverse proxies
*/
public static function requestUri() {
$uri = isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : '';
if (OC_Config::getValue('overwritewebroot', '') !== '' and self::isOverwriteCondition()) {
$uri = self::scriptName() . substr($uri, strlen($_SERVER['SCRIPT_NAME']));
}
return $uri;
}
/**
* @brief Returns the script name
* @returns string the script name
*
* Returns the script name, even if the website uses one or more
* reverse proxies
*/
public static function scriptName() {
$name = $_SERVER['SCRIPT_NAME'];
if (OC_Config::getValue('overwritewebroot', '') !== '' and self::isOverwriteCondition()) {
$serverroot = str_replace("\\", '/', substr(__DIR__, 0, -strlen('lib/private/')));
$suburi = str_replace("\\", "/", substr(realpath($_SERVER["SCRIPT_FILENAME"]), strlen($serverroot)));
$name = OC_Config::getValue('overwritewebroot', '') . $suburi;
}
return $name;
}
/**
* @brief get Path info from request
* @returns string Path info or false when not found
*/
public static function getPathInfo() {
if (array_key_exists('PATH_INFO', $_SERVER)) {
$path_info = $_SERVER['PATH_INFO'];
}else{
$path_info = self::getRawPathInfo();
// following is taken from Sabre_DAV_URLUtil::decodePathSegment
$path_info = rawurldecode($path_info);
$encoding = mb_detect_encoding($path_info, array('UTF-8', 'ISO-8859-1'));
switch($encoding) {
case 'ISO-8859-1' :
$path_info = utf8_encode($path_info);
}
// end copy
}
return $path_info;
}
/**
* @brief get Path info from request, not urldecoded
* @returns string Path info or false when not found
*/
public static function getRawPathInfo() {
$requestUri = $_SERVER['REQUEST_URI'];
// remove too many leading slashes - can be caused by reverse proxy configuration
if (strpos($requestUri, '/') === 0) {
$requestUri = '/' . ltrim($requestUri, '/');
}
// Remove the query string from REQUEST_URI
if ($pos = strpos($requestUri, '?')) {
$requestUri = substr($requestUri, 0, $pos);
}
$scriptName = $_SERVER['SCRIPT_NAME'];
$path_info = $requestUri;
// strip off the script name's dir and file name
list($path, $name) = \Sabre_DAV_URLUtil::splitPath($scriptName);
if (!empty($path)) {
if( $path === $path_info || strpos($path_info, $path.'/') === 0) {
$path_info = substr($path_info, strlen($path));
} else {
throw new Exception("The requested uri($requestUri) cannot be processed by the script '$scriptName')");
}
}
if (strpos($path_info, '/'.$name) === 0) {
$path_info = substr($path_info, strlen($name) + 1);
}
if (strpos($path_info, $name) === 0) {
$path_info = substr($path_info, strlen($name));
}
if($path_info === '/'){
return '';
} else {
return $path_info;
}
}
/**
* @brief Check if this is a no-cache request
* @returns boolean true for no-cache
*/
static public function isNoCache() {
if (!isset($_SERVER['HTTP_CACHE_CONTROL'])) {
return false;
}
return $_SERVER['HTTP_CACHE_CONTROL'] == 'no-cache';
}
/**
* @brief Check if the requestor understands gzip
* @returns boolean true for gzip encoding supported
*/
static public function acceptGZip() {
if (!isset($_SERVER['HTTP_ACCEPT_ENCODING'])) {
return false;
}
$HTTP_ACCEPT_ENCODING = $_SERVER["HTTP_ACCEPT_ENCODING"];
if( strpos($HTTP_ACCEPT_ENCODING, 'x-gzip') !== false )
return 'x-gzip';
else if( strpos($HTTP_ACCEPT_ENCODING, 'gzip') !== false )
return 'gzip';
return false;
}
/**
* @brief Check if the requester sent along an mtime
* @returns false or an mtime
*/
static public function hasModificationTime () {
if (isset($_SERVER['HTTP_X_OC_MTIME'])) {
return $_SERVER['HTTP_X_OC_MTIME'];
} else {
return false;
}
}
/**
* Checks whether the user agent matches a given regex
* @param string|array $agent agent name or array of agent names
* @return boolean true if at least one of the given agent matches,
* false otherwise
*/
static public function isUserAgent($agent) {
if (!is_array($agent)) {
$agent = array($agent);
}
foreach ($agent as $regex) {
if (preg_match($regex, $_SERVER['HTTP_USER_AGENT'])) {
return true;
}
}
return false;
}
}
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