mirror of https://github.com/friendica/friendica
476 lines
16 KiB
PHP
476 lines
16 KiB
PHP
<?php
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/**
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* PEAR_REST
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*
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* PHP versions 4 and 5
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*
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* @category pear
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* @package PEAR
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* @author Greg Beaver <cellog@php.net>
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* @copyright 1997-2009 The Authors
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* @license http://opensource.org/licenses/bsd-license.php New BSD License
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* @link http://pear.php.net/package/PEAR
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* @since File available since Release 1.4.0a1
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*/
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/**
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* For downloading xml files
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*/
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require_once 'PEAR.php';
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require_once 'PEAR/XMLParser.php';
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require_once 'PEAR/Proxy.php';
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/**
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* Intelligently retrieve data, following hyperlinks if necessary, and re-directing
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* as well
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* @category pear
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* @package PEAR
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* @author Greg Beaver <cellog@php.net>
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* @copyright 1997-2009 The Authors
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* @license http://opensource.org/licenses/bsd-license.php New BSD License
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* @version Release: 1.10.4
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* @link http://pear.php.net/package/PEAR
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* @since Class available since Release 1.4.0a1
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*/
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class PEAR_REST
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{
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var $config;
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var $_options;
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function __construct(&$config, $options = array())
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{
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$this->config = &$config;
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$this->_options = $options;
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}
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/**
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* Retrieve REST data, but always retrieve the local cache if it is available.
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*
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* This is useful for elements that should never change, such as information on a particular
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* release
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* @param string full URL to this resource
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* @param array|false contents of the accept-encoding header
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* @param boolean if true, xml will be returned as a string, otherwise, xml will be
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* parsed using PEAR_XMLParser
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* @return string|array
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*/
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function retrieveCacheFirst($url, $accept = false, $forcestring = false, $channel = false)
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{
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$cachefile = $this->config->get('cache_dir') . DIRECTORY_SEPARATOR .
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md5($url) . 'rest.cachefile';
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if (file_exists($cachefile)) {
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return unserialize(implode('', file($cachefile)));
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}
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return $this->retrieveData($url, $accept, $forcestring, $channel);
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}
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/**
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* Retrieve a remote REST resource
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* @param string full URL to this resource
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* @param array|false contents of the accept-encoding header
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* @param boolean if true, xml will be returned as a string, otherwise, xml will be
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* parsed using PEAR_XMLParser
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* @return string|array
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*/
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function retrieveData($url, $accept = false, $forcestring = false, $channel = false)
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{
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$cacheId = $this->getCacheId($url);
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if ($ret = $this->useLocalCache($url, $cacheId)) {
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return $ret;
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}
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$file = $trieddownload = false;
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if (!isset($this->_options['offline'])) {
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$trieddownload = true;
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$file = $this->downloadHttp($url, $cacheId ? $cacheId['lastChange'] : false, $accept, $channel);
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}
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if (PEAR::isError($file)) {
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if ($file->getCode() !== -9276) {
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return $file;
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}
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$trieddownload = false;
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$file = false; // use local copy if available on socket connect error
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}
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if (!$file) {
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$ret = $this->getCache($url);
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if (!PEAR::isError($ret) && $trieddownload) {
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// reset the age of the cache if the server says it was unmodified
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$result = $this->saveCache($url, $ret, null, true, $cacheId);
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if (PEAR::isError($result)) {
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return PEAR::raiseError($result->getMessage());
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}
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}
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return $ret;
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}
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if (is_array($file)) {
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$headers = $file[2];
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$lastmodified = $file[1];
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$content = $file[0];
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} else {
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$headers = array();
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$lastmodified = false;
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$content = $file;
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}
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if ($forcestring) {
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$result = $this->saveCache($url, $content, $lastmodified, false, $cacheId);
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if (PEAR::isError($result)) {
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return PEAR::raiseError($result->getMessage());
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}
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return $content;
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}
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if (isset($headers['content-type'])) {
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$content_type = explode(";", $headers['content-type']);
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$content_type = $content_type[0];
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switch ($content_type) {
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case 'text/xml' :
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case 'application/xml' :
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case 'text/plain' :
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if ($content_type === 'text/plain') {
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$check = substr($content, 0, 5);
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if ($check !== '<?xml') {
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break;
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}
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}
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$parser = new PEAR_XMLParser;
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PEAR::pushErrorHandling(PEAR_ERROR_RETURN);
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$err = $parser->parse($content);
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PEAR::popErrorHandling();
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if (PEAR::isError($err)) {
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return PEAR::raiseError('Invalid xml downloaded from "' . $url . '": ' .
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$err->getMessage());
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}
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$content = $parser->getData();
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case 'text/html' :
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default :
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// use it as a string
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}
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} else {
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// assume XML
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$parser = new PEAR_XMLParser;
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$parser->parse($content);
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$content = $parser->getData();
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}
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$result = $this->saveCache($url, $content, $lastmodified, false, $cacheId);
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if (PEAR::isError($result)) {
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return PEAR::raiseError($result->getMessage());
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}
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return $content;
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}
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function useLocalCache($url, $cacheid = null)
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{
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if ($cacheid === null) {
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$cacheidfile = $this->config->get('cache_dir') . DIRECTORY_SEPARATOR .
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md5($url) . 'rest.cacheid';
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if (!file_exists($cacheidfile)) {
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return false;
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}
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$cacheid = unserialize(implode('', file($cacheidfile)));
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}
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$cachettl = $this->config->get('cache_ttl');
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// If cache is newer than $cachettl seconds, we use the cache!
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if (time() - $cacheid['age'] < $cachettl) {
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return $this->getCache($url);
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}
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return false;
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}
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function getCacheId($url)
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{
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$cacheidfile = $this->config->get('cache_dir') . DIRECTORY_SEPARATOR .
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md5($url) . 'rest.cacheid';
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if (!file_exists($cacheidfile)) {
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return false;
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}
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$ret = unserialize(implode('', file($cacheidfile)));
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return $ret;
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}
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function getCache($url)
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{
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$cachefile = $this->config->get('cache_dir') . DIRECTORY_SEPARATOR .
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md5($url) . 'rest.cachefile';
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if (!file_exists($cachefile)) {
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return PEAR::raiseError('No cached content available for "' . $url . '"');
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}
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return unserialize(implode('', file($cachefile)));
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}
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/**
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* @param string full URL to REST resource
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* @param string original contents of the REST resource
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* @param array HTTP Last-Modified and ETag headers
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* @param bool if true, then the cache id file should be regenerated to
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* trigger a new time-to-live value
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*/
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function saveCache($url, $contents, $lastmodified, $nochange = false, $cacheid = null)
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{
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$cache_dir = $this->config->get('cache_dir');
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$d = $cache_dir . DIRECTORY_SEPARATOR . md5($url);
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$cacheidfile = $d . 'rest.cacheid';
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$cachefile = $d . 'rest.cachefile';
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if (!is_dir($cache_dir)) {
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if (System::mkdir(array('-p', $cache_dir)) === false) {
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return PEAR::raiseError("The value of config option cache_dir ($cache_dir) is not a directory and attempts to create the directory failed.");
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}
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}
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if (!is_writeable($cache_dir)) {
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// If writing to the cache dir is not going to work, silently do nothing.
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// An ugly hack, but retains compat with PEAR 1.9.1 where many commands
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// work fine as non-root user (w/out write access to default cache dir).
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return true;
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}
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if ($cacheid === null && $nochange) {
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$cacheid = unserialize(implode('', file($cacheidfile)));
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}
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$idData = serialize(array(
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'age' => time(),
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'lastChange' => ($nochange ? $cacheid['lastChange'] : $lastmodified),
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));
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$result = $this->saveCacheFile($cacheidfile, $idData);
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if (PEAR::isError($result)) {
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return $result;
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} elseif ($nochange) {
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return true;
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}
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$result = $this->saveCacheFile($cachefile, serialize($contents));
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if (PEAR::isError($result)) {
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if (file_exists($cacheidfile)) {
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@unlink($cacheidfile);
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}
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return $result;
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}
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return true;
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}
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function saveCacheFile($file, $contents)
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{
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$len = strlen($contents);
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$cachefile_fp = @fopen($file, 'xb'); // x is the O_CREAT|O_EXCL mode
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if ($cachefile_fp !== false) { // create file
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if (fwrite($cachefile_fp, $contents, $len) < $len) {
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fclose($cachefile_fp);
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return PEAR::raiseError("Could not write $file.");
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}
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} else { // update file
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$cachefile_fp = @fopen($file, 'r+b'); // do not truncate file
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if (!$cachefile_fp) {
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return PEAR::raiseError("Could not open $file for writing.");
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}
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if (OS_WINDOWS) {
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$not_symlink = !is_link($file); // see bug #18834
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} else {
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$cachefile_lstat = lstat($file);
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$cachefile_fstat = fstat($cachefile_fp);
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$not_symlink = $cachefile_lstat['mode'] == $cachefile_fstat['mode']
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&& $cachefile_lstat['ino'] == $cachefile_fstat['ino']
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&& $cachefile_lstat['dev'] == $cachefile_fstat['dev']
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&& $cachefile_fstat['nlink'] === 1;
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}
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if ($not_symlink) {
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ftruncate($cachefile_fp, 0); // NOW truncate
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if (fwrite($cachefile_fp, $contents, $len) < $len) {
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fclose($cachefile_fp);
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return PEAR::raiseError("Could not write $file.");
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}
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} else {
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fclose($cachefile_fp);
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$link = function_exists('readlink') ? readlink($file) : $file;
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return PEAR::raiseError('SECURITY ERROR: Will not write to ' . $file . ' as it is symlinked to ' . $link . ' - Possible symlink attack');
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}
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}
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fclose($cachefile_fp);
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return true;
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}
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/**
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* Efficiently Download a file through HTTP. Returns downloaded file as a string in-memory
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* This is best used for small files
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*
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* If an HTTP proxy has been configured (http_proxy PEAR_Config
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* setting), the proxy will be used.
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*
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* @param string $url the URL to download
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* @param string $save_dir directory to save file in
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* @param false|string|array $lastmodified header values to check against for caching
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* use false to return the header values from this download
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* @param false|array $accept Accept headers to send
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* @return string|array Returns the contents of the downloaded file or a PEAR
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* error on failure. If the error is caused by
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* socket-related errors, the error object will
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* have the fsockopen error code available through
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* getCode(). If caching is requested, then return the header
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* values.
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*
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* @access public
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*/
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function downloadHttp($url, $lastmodified = null, $accept = false, $channel = false)
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{
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static $redirect = 0;
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// always reset , so we are clean case of error
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$wasredirect = $redirect;
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$redirect = 0;
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$info = parse_url($url);
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if (!isset($info['scheme']) || !in_array($info['scheme'], array('http', 'https'))) {
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return PEAR::raiseError('Cannot download non-http URL "' . $url . '"');
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}
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if (!isset($info['host'])) {
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return PEAR::raiseError('Cannot download from non-URL "' . $url . '"');
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}
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$host = isset($info['host']) ? $info['host'] : null;
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$port = isset($info['port']) ? $info['port'] : null;
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$path = isset($info['path']) ? $info['path'] : null;
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$schema = (isset($info['scheme']) && $info['scheme'] == 'https') ? 'https' : 'http';
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$proxy = new PEAR_Proxy($this->config);
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if (empty($port)) {
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$port = (isset($info['scheme']) && $info['scheme'] == 'https') ? 443 : 80;
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}
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if ($proxy->isProxyConfigured() && $schema === 'http') {
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$request = "GET $url HTTP/1.1\r\n";
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} else {
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$request = "GET $path HTTP/1.1\r\n";
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}
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$request .= "Host: $host\r\n";
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$ifmodifiedsince = '';
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if (is_array($lastmodified)) {
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if (isset($lastmodified['Last-Modified'])) {
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$ifmodifiedsince = 'If-Modified-Since: ' . $lastmodified['Last-Modified'] . "\r\n";
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}
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if (isset($lastmodified['ETag'])) {
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$ifmodifiedsince .= "If-None-Match: $lastmodified[ETag]\r\n";
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}
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} else {
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$ifmodifiedsince = ($lastmodified ? "If-Modified-Since: $lastmodified\r\n" : '');
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}
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$request .= $ifmodifiedsince .
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"User-Agent: PEAR/1.10.4/PHP/" . PHP_VERSION . "\r\n";
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$username = $this->config->get('username', null, $channel);
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$password = $this->config->get('password', null, $channel);
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if ($username && $password) {
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$tmp = base64_encode("$username:$password");
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$request .= "Authorization: Basic $tmp\r\n";
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}
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$proxyAuth = $proxy->getProxyAuth();
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if ($proxyAuth) {
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$request .= 'Proxy-Authorization: Basic ' .
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$proxyAuth . "\r\n";
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}
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if ($accept) {
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$request .= 'Accept: ' . implode(', ', $accept) . "\r\n";
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}
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$request .= "Accept-Encoding:\r\n";
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$request .= "Connection: close\r\n";
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$request .= "\r\n";
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$secure = ($schema == 'https');
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$fp = $proxy->openSocket($host, $port, $secure);
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if (PEAR::isError($fp)) {
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return $fp;
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}
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fwrite($fp, $request);
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$headers = array();
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$reply = 0;
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while ($line = trim(fgets($fp, 1024))) {
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if (preg_match('/^([^:]+):\s+(.*)\s*\\z/', $line, $matches)) {
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$headers[strtolower($matches[1])] = trim($matches[2]);
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} elseif (preg_match('|^HTTP/1.[01] ([0-9]{3}) |', $line, $matches)) {
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$reply = (int)$matches[1];
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if ($reply == 304 && ($lastmodified || ($lastmodified === false))) {
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return false;
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}
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if (!in_array($reply, array(200, 301, 302, 303, 305, 307))) {
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return PEAR::raiseError("File $schema://$host:$port$path not valid (received: $line)");
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}
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}
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}
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if ($reply != 200) {
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if (!isset($headers['location'])) {
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return PEAR::raiseError("File $schema://$host:$port$path not valid (redirected but no location)");
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}
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if ($wasredirect > 4) {
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return PEAR::raiseError("File $schema://$host:$port$path not valid (redirection looped more than 5 times)");
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}
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$redirect = $wasredirect + 1;
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return $this->downloadHttp($headers['location'], $lastmodified, $accept, $channel);
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}
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$length = isset($headers['content-length']) ? $headers['content-length'] : -1;
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$data = '';
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while ($chunk = @fread($fp, 8192)) {
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$data .= $chunk;
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}
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fclose($fp);
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if ($lastmodified === false || $lastmodified) {
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if (isset($headers['etag'])) {
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$lastmodified = array('ETag' => $headers['etag']);
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}
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if (isset($headers['last-modified'])) {
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if (is_array($lastmodified)) {
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$lastmodified['Last-Modified'] = $headers['last-modified'];
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} else {
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$lastmodified = $headers['last-modified'];
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}
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}
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return array($data, $lastmodified, $headers);
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}
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return $data;
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}
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}
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