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<?php
/**
* StatusNet, the distributed open-source microblogging tool
*
* Issue temporary OAuth credentials (a request token)
*
* 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 API
* @package StatusNet
* @author Zach Copley <zach@status.net>
* @copyright 2010 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 INSTALLDIR . '/lib/apioauth.php';
/**
* Issue temporary OAuth credentials (a request token)
*
* @category API
* @package StatusNet
* @author Zach Copley <zach@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 ApiOauthRequestTokenAction extends ApiOauthAction
{
/**
* Take arguments for running
*
* @param array $args $_REQUEST args
*
* @return boolean success flag
*
*/
function prepare($args)
{
parent::prepare($args);
// XXX: support "force_login" parameter like Twitter? (Forces the user to enter
// their credentials to ensure the correct users account is authorized.)
return true;
}
/**
* Handle a request for temporary OAuth credentials
*
* Make sure the request is kosher, then emit a set of temporary
* credentials -- AKA an unauthorized request token.
*
* @param array $args array of arguments
*
* @return void
*/
function handle($args)
{
parent::handle($args);
$datastore = new ApiStatusNetOAuthDataStore();
$server = new OAuthServer($datastore);
$hmac_method = new OAuthSignatureMethod_HMAC_SHA1();
$server->add_signature_method($hmac_method);
try {
$req = OAuthRequest::from_request();
// verify callback
if (!$this->verifyCallback($req->get_parameter('oauth_callback'))) {
throw new OAuthException(
"You must provide a valid URL or 'oob' in oauth_callback.",
400
);
}
// check signature and issue a new request token
$token = $server->fetch_request_token($req);
// return token to the client
$this->showRequestToken($token);
} catch (OAuthException $e) {
common_log(LOG_WARNING, 'API OAuthException - ' . $e->getMessage());
// Return 401 for for bad credentials or signature problems,
// and 400 for missing or unsupported parameters
$code = $e->getCode();
$this->clientError($e->getMessage(), empty($code) ? 401 : $code, 'text');
}
}
/*
* Display temporary OAuth credentials
*/
function showRequestToken($token)
{
header('Content-Type: application/x-www-form-urlencoded');
print $token;
print '&oauth_callback_confirmed=true';
}
/* Make sure the callback parameter contains either a real URL
* or the string 'oob'.
*
* @todo Check for evil/banned URLs here
*
* @return boolean true or false
*/
function verifyCallback($callback)
{
if ($callback == "oob") {
common_debug("OAuth request token requested for out of bounds client.");
return true;
} else {
return Validate::uri(
$callback,
array('allowed_schemes' => array('http', 'https'))
);
}
}
}
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