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<?php
/**
* StatusNet, the distributed open-source microblogging tool
*
* Utility for doing HTTP-related things
*
* PHP version 5
*
* LICENCE: This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category Action
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @copyright 2009 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
if (!defined('STATUSNET')) {
exit(1);
}
require_once 'HTTP/Request2.php';
require_once 'HTTP/Request2/Response.php';
/**
* Useful structure for HTTP responses
*
* We make HTTP calls in several places, and we have several different
* ways of doing them. This class hides the specifics of what underlying
* library (curl or PHP-HTTP or whatever) that's used.
*
* This extends the HTTP_Request2_Response class with methods to get info
* about any followed redirects.
*
* @category HTTP
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @author Brion Vibber <brion@status.net>
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
class HTTPResponse extends HTTP_Request2_Response
{
function __construct(HTTP_Request2_Response $response, $url, $redirects=0)
{
foreach (get_object_vars($response) as $key => $val) {
$this->$key = $val;
}
$this->url = strval($url);
$this->redirectCount = intval($redirects);
}
/**
* Get the count of redirects that have been followed, if any.
* @return int
*/
function getRedirectCount() {
return $this->redirectCount;
}
/**
* Gets the final target URL, after any redirects have been followed.
* @return string URL
*/
function getUrl() {
return $this->url;
}
}
/**
* Utility class for doing HTTP client stuff
*
* We make HTTP calls in several places, and we have several different
* ways of doing them. This class hides the specifics of what underlying
* library (curl or PHP-HTTP or whatever) that's used.
*
* This extends the PEAR HTTP_Request2 package:
* - sends StatusNet-specific User-Agent header
* - 'follow_redirects' config option, defaulting off
* - 'max_redirs' config option, defaulting to 10
* - extended response class adds getRedirectCount() and getUrl() methods
* - get() and post() convenience functions return body content directly
*
* @category HTTP
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @author Brion Vibber <brion@status.net>
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
class HTTPClient extends HTTP_Request2
{
function __construct($url=null, $method=self::METHOD_GET, $config=array())
{
$this->config['max_redirs'] = 10;
$this->config['follow_redirects'] = false;
parent::__construct($url, $method, $config);
$this->setHeader('User-Agent', $this->userAgent());
}
/**
* Convenience function to run a get request and return the response body.
* Use when you don't need to get into details of the response.
*
* @return mixed string on success, false on failure
*/
function get()
{
$this->setMethod(self::METHOD_GET);
return $this->doRequest();
}
/**
* Convenience function to post form data and return the response body.
* Use when you don't need to get into details of the response.
*
* @param array associative array of form data to submit
* @return mixed string on success, false on failure
*/
public function post($data=array())
{
$this->setMethod(self::METHOD_POST);
if ($data) {
$this->addPostParameter($data);
}
return $this->doRequest();
}
/**
* @return mixed string on success, false on failure
*/
protected function doRequest()
{
try {
$response = $this->send();
$code = $response->getStatus();
if (($code < 200) || ($code >= 400)) {
return false;
}
return $response->getBody();
} catch (HTTP_Request2_Exception $e) {
$this->log(LOG_ERR, $e->getMessage());
return false;
}
}
protected function log($level, $detail) {
$method = $this->getMethod();
$url = $this->getUrl();
common_log($level, __CLASS__ . ": HTTP $method $url - $detail");
}
/**
* Pulls up StatusNet's customized user-agent string, so services
* we hit can track down the responsible software.
*/
function userAgent()
{
return "StatusNet/".STATUSNET_VERSION." (".STATUSNET_CODENAME.")";
}
function send()
{
$maxRedirs = intval($this->config['max_redirs']);
if (empty($this->config['follow_redirects'])) {
$maxRedirs = 0;
}
$redirs = 0;
do {
try {
$response = parent::send();
} catch (HTTP_Request2_Exception $e) {
$this->log(LOG_ERR, $e->getMessage());
throw $e;
}
$code = $response->getStatus();
if ($code >= 200 && $code < 300) {
$reason = $response->getReasonPhrase();
$this->log(LOG_INFO, "$code $reason");
} elseif ($code >= 300 && $code < 400) {
$url = $this->getUrl();
$target = $response->getHeader('Location');
if (++$redirs >= $maxRedirs) {
common_log(LOG_ERR, __CLASS__ . ": Too many redirects: skipping $code redirect from $url to $target");
break;
}
try {
$this->setUrl($target);
$this->setHeader('Referer', $url);
common_log(LOG_INFO, __CLASS__ . ": Following $code redirect from $url to $target");
continue;
} catch (HTTP_Request2_Exception $e) {
common_log(LOG_ERR, __CLASS__ . ": Invalid $code redirect from $url to $target");
}
} else {
$reason = $response->getReasonPhrase();
$this->log(LOG_ERR, "$code $reason");
}
break;
} while ($maxRedirs);
return new HTTPResponse($response, $this->getUrl(), $redirs);
}
}
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