406 lines
14 KiB
PHP
406 lines
14 KiB
PHP
<?php
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/**
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* StatusNet, the distributed open-source microblogging tool
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*
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* Utility for doing HTTP-related things
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*
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* PHP version 5
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*
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* LICENCE: This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero 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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* This program 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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category Action
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @copyright 2009 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*/
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if (!defined('GNUSOCIAL')) { exit(1); }
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/**
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* Useful structure for HTTP responses
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*
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* We make HTTP calls in several places, and we have several different
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* ways of doing them. This class hides the specifics of what underlying
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* library (curl or PHP-HTTP or whatever) that's used.
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*
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* This extends the HTTP_Request2_Response class with methods to get info
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* about any followed redirects.
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*
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* Originally used the name 'HTTPResponse' to match earlier code, but
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* this conflicts with a class in in the PECL HTTP extension.
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*
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* @category HTTP
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @author Brion Vibber <brion@status.net>
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*/
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class GNUsocial_HTTPResponse extends HTTP_Request2_Response
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{
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function __construct(HTTP_Request2_Response $response, $url, $redirects=0)
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{
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foreach (get_object_vars($response) as $key => $val) {
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$this->$key = $val;
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}
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$this->url = strval($url);
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$this->redirectCount = intval($redirects);
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}
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/**
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* Get the count of redirects that have been followed, if any.
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* @return int
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*/
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function getRedirectCount()
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{
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return $this->redirectCount;
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}
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/**
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* Gets the target URL, before any redirects. Use getEffectiveUrl() for final target.
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* @return string URL
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*/
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function getUrl()
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{
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return $this->url;
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}
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/**
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* Check if the response is OK, generally a 200 or other 2xx status code.
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* @return bool
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*/
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function isOk()
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{
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$status = $this->getStatus();
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return ($status >= 200 && $status < 300);
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}
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}
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/**
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* Utility class for doing HTTP client stuff
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*
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* We make HTTP calls in several places, and we have several different
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* ways of doing them. This class hides the specifics of what underlying
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* library (curl or PHP-HTTP or whatever) that's used.
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*
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* This extends the PEAR HTTP_Request2 package:
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* - sends StatusNet-specific User-Agent header
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* - 'follow_redirects' config option, defaulting on
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* - 'max_redirs' config option, defaulting to 10
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* - extended response class adds getRedirectCount() and getUrl() methods
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* - get() and post() convenience functions return body content directly
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*
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* @category HTTP
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @author Brion Vibber <brion@status.net>
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*/
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class HTTPClient extends HTTP_Request2
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{
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function __construct($url=null, $method=self::METHOD_GET, $config=array())
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{
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if (is_int(common_config('http', 'timeout'))) {
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// Reasonably you shouldn't set http/timeout to 0 because of
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// malicious remote servers that can cause infinitely long
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// responses... But the default in HTTP_Request2 is 0 for
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// some reason and should probably be considered a valid value.
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$this->config['timeout'] = common_config('http', 'timeout');
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} else {
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common_log(LOG_ERR, 'config option http/timeout is not an integer value: '._ve(common_config('http', 'timeout')));
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}
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if (!empty(common_config('http', 'connect_timeout'))) {
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$this->config['connect_timeout'] = common_config('http', 'connect_timeout');
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}
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$this->config['max_redirs'] = 10;
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$this->config['follow_redirects'] = true;
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// We've had some issues with keepalive breaking with
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// HEAD requests, such as to youtube which seems to be
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// emitting chunked encoding info for an empty body
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// instead of not emitting anything. This may be a
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// bug on YouTube's end, but the upstream libray
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// ought to be investigated to see if we can handle
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// it gracefully in that case as well.
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$this->config['protocol_version'] = '1.0';
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// Default state of OpenSSL seems to have no trusted
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// SSL certificate authorities, which breaks hostname
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// verification and means we have a hard time communicating
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// with other sites' HTTPS interfaces.
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//
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// Turn off verification unless we've configured a CA bundle.
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if (common_config('http', 'ssl_cafile')) {
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$this->config['ssl_cafile'] = common_config('http', 'ssl_cafile');
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} else {
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$this->config['ssl_verify_peer'] = false;
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}
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// This means "verify the cert hostname against what we connect to", it does not
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// imply CA trust or anything like that. Just the hostname.
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$this->config['ssl_verify_host'] = common_config('http', 'ssl_verify_host');
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if (common_config('http', 'curl') && extension_loaded('curl')) {
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$this->config['adapter'] = 'HTTP_Request2_Adapter_Curl';
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}
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foreach (array('host', 'port', 'user', 'password', 'auth_scheme') as $cf) {
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$k = 'proxy_'.$cf;
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$v = common_config('http', $k);
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if (!empty($v)) {
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$this->config[$k] = $v;
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}
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}
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parent::__construct($url, $method, $config);
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$this->setHeader('User-Agent', self::userAgent());
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}
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/**
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* Convenience/back-compat instantiator
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* @return HTTPClient
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*/
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public static function start()
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{
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return new HTTPClient();
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}
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/**
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* Quick static function to GET a URL
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*/
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public static function quickGet($url, $accept=null, array $params=array(), array $headers=array())
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{
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if (!empty($params)) {
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$params = http_build_query($params, null, '&');
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if (strpos($url, '?') === false) {
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$url .= '?' . $params;
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} else {
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$url .= '&' . $params;
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}
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}
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$client = new HTTPClient();
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if (!is_null($accept)) {
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$client->setHeader('Accept', $accept);
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}
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$response = $client->get($url, $headers);
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if (!$response->isOk()) {
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// TRANS: Exception. %s is the URL we tried to GET.
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throw new Exception(sprintf(_m('Could not GET URL %s.'), $url), $response->getStatus());
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}
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return $response->getBody();
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}
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public static function quickGetJson($url, $params=array())
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{
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$data = json_decode(self::quickGet($url, null, $params));
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if (is_null($data)) {
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common_debug('Could not decode JSON data from URL: '.$url);
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throw new ServerException('Could not decode JSON data from URL');
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}
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return $data;
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}
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/**
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* If you want an Accept header, put it in $headers
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*/
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public static function quickHead($url, array $params=array(), array $headers=array())
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{
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if (!empty($params)) {
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$params = http_build_query($params, null, '&');
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if (strpos($url, '?') === false) {
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$url .= '?' . $params;
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} else {
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$url .= '&' . $params;
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}
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}
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$client = new HTTPClient();
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$response = $client->head($url, $headers);
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if (!$response->isOk()) {
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// TRANS: Exception. %s is the URL we tried to GET.
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throw new Exception(sprintf(_m('Could not GET URL %s.'), $url), $response->getStatus());
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}
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return $response->getHeader();
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}
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/**
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* Convenience function to run a GET request.
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*
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* @return GNUsocial_HTTPResponse
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* @throws HTTP_Request2_Exception
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*/
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public function get($url, $headers=array())
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{
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return $this->doRequest($url, self::METHOD_GET, $headers);
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}
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/**
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* Convenience function to run a HEAD request.
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*
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* NOTE: Will probably turn into a GET request if you let it follow redirects!
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* That option is only there to be flexible and may be removed in the future!
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*
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* @return GNUsocial_HTTPResponse
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* @throws HTTP_Request2_Exception
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*/
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public function head($url, $headers=array(), $follow_redirects=false)
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{
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// Save the configured value for follow_redirects
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$old_follow = $this->config['follow_redirects'];
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try {
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// Temporarily (possibly) override the follow_redirects setting
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$this->config['follow_redirects'] = $follow_redirects;
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return $this->doRequest($url, self::METHOD_HEAD, $headers);
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} catch (Exception $e) {
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// Let the exception go on its merry way.
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throw $e;
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} finally {
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// reset to the old value
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$this->config['follow_redirects'] = $old_follow;
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}
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//we've either returned or thrown exception here
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}
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/**
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* Convenience function to POST form data.
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*
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* @param string $url
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* @param array $headers optional associative array of HTTP headers
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* @param array $data optional associative array or blob of form data to submit
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* @return GNUsocial_HTTPResponse
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* @throws HTTP_Request2_Exception
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*/
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public function post($url, $headers=array(), $data=array())
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{
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if ($data) {
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$this->addPostParameter($data);
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}
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return $this->doRequest($url, self::METHOD_POST, $headers);
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}
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/**
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* @param string $url The URL including possible querystring
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* @param string $method The HTTP method to use
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* @param array $headers List of already formatted strings
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* (not an associative array, to allow
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* multiple same-named headers)
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*
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* @return GNUsocial_HTTPResponse
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* @throws HTTP_Request2_Exception
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*/
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protected function doRequest($url, $method, array $headers=array())
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{
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$this->setUrl($url);
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// Workaround for HTTP_Request2 not setting up SNI in socket contexts;
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// This fixes cert validation for SSL virtual hosts using SNI.
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// Requires PHP 5.3.2 or later and OpenSSL with SNI support.
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if ($this->url->getScheme() == 'https' && defined('OPENSSL_TLSEXT_SERVER_NAME')) {
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$this->config['ssl_SNI_enabled'] = true;
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$this->config['ssl_SNI_server_name'] = $this->url->getHost();
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}
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$this->setMethod($method);
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foreach ($headers as $header) {
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$this->setHeader($header);
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}
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$response = $this->send();
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if (is_null($response)) {
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// TRANS: Failed to retrieve a remote web resource, %s is the target URL.
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throw new NoHttpResponseException($url);
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}
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return $response;
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}
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protected function log($level, $detail) {
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$method = $this->getMethod();
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$url = $this->getUrl();
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common_log($level, __CLASS__ . ": HTTP $method $url - $detail");
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}
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/**
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* Pulls up GNU Social's customized user-agent string, so services
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* we hit can track down the responsible software.
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*
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* @return string
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*/
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static public function userAgent()
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{
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return GNUSOCIAL_ENGINE . '/' . GNUSOCIAL_VERSION
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. ' (' . GNUSOCIAL_CODENAME . ')';
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}
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/**
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* Actually performs the HTTP request and returns a
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* GNUsocial_HTTPResponse object with response body and header info.
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*
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* Wraps around parent send() to add logging and redirection processing.
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*
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* @return GNUsocial_HTTPResponse
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* @throw HTTP_Request2_Exception
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*/
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public function send()
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{
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$maxRedirs = intval($this->config['max_redirs']);
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if (empty($this->config['max_redirs'])) {
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$maxRedirs = 0;
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}
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$redirs = 0;
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$redirUrls = array();
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do {
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try {
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$response = parent::send();
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} catch (Exception $e) {
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$this->log(LOG_ERR, $e->getMessage());
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throw $e;
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}
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$code = $response->getStatus();
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$effectiveUrl = $response->getEffectiveUrl();
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$redirUrls[] = $effectiveUrl;
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$response->redirUrls = $redirUrls;
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if ($code >= 200 && $code < 300) {
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$reason = $response->getReasonPhrase();
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$this->log(LOG_INFO, "$code $reason");
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} elseif ($code >= 300 && $code < 400) {
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$url = $this->getUrl();
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$target = $response->getHeader('Location');
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if (++$redirs >= $maxRedirs) {
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common_log(LOG_ERR, __CLASS__ . ": Too many redirects: skipping $code redirect from $url to $target");
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break;
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}
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try {
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$this->setUrl($target);
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$this->setHeader('Referer', $url);
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common_log(LOG_INFO, __CLASS__ . ": Following $code redirect from $url to $target");
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continue;
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} catch (HTTP_Request2_Exception $e) {
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common_log(LOG_ERR, __CLASS__ . ": Invalid $code redirect from $url to $target");
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}
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} else {
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$reason = $response->getReasonPhrase();
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$this->log(LOG_ERR, "$code $reason");
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}
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break;
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} while ($maxRedirs);
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return new GNUsocial_HTTPResponse($response, $this->getUrl(), $redirs);
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}
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}
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