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+<?php
+/**
+ * Laconica, the distributed open-source microblogging tool
+ *
+ * Class for doing OAuth authentication against Twitter
+ *
+ * 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 TwitterauthorizationAction
+ * @package Laconica
+ * @author Zach Copely <zach@controlyourself.ca>
+ * @copyright 2009 Control Yourself, Inc.
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link http://laconi.ca/
+ */
+
+if (!defined('LACONICA')) {
+ exit(1);
+}
+
+class TwitterauthorizationAction extends Action
+{
+
+ function prepare($args)
+ {
+ parent::prepare($args);
+
+ $this->oauth_token = $this->arg('oauth_token');
+
+ return true;
+ }
+
+ function handle($args)
+ {
+ parent::handle($args);
+
+ if (!common_logged_in()) {
+ $this->clientError(_('Not logged in.'), 403);
+ }
+
+ $user = common_current_user();
+ $flink = Foreign_link::getByUserID($user->id, TWITTER_SERVICE);
+
+ // If there's already a foreign link record, it means we already
+ // have an access token, and this is unecessary. So go back.
+
+ if (isset($flink)) {
+ common_redirect(common_local_url('twittersettings'));
+ }
+
+ // $this->oauth_token is only populated once Twitter authorizes our
+ // request token. If it's empty we're at the beginning of the auth
+ // process
+
+ if (empty($this->oauth_token)) {
+
+ // Get a new request token and authorize it
+
+ $client = new TwitterOAuthClient();
+ $req_tok = $client->getRequestToken();
+
+ // Sock the request token away in the session temporarily
+
+ $_SESSION['twitter_request_token'] = $req_tok->key;
+ $_SESSION['twitter_request_token_secret'] = $req_tok->key;
+
+ $auth_link = $client->getAuthorizeLink($req_tok);
+ common_redirect($auth_link);
+
+ } else {
+
+ // Check to make sure Twitter sent us the same request token we sent
+
+ if ($_SESSION['twitter_request_token'] != $this->oauth_token) {
+ $this->serverError(_('Couldn\'t link your Twitter account.'));
+ }
+
+ $client = new TwitterOAuthClient($_SESSION['twitter_request_token'],
+ $_SESSION['twitter_request_token_secret']);
+
+ // Exchange the request token for an access token
+
+ $atok = $client->getAccessToken();
+
+ // Save the access token and Twitter user info
+
+ $client = new TwitterOAuthClient($atok->key, $atok->secret);
+
+ $twitter_user = $client->verify_credentials();
+
+ $user = common_current_user();
+
+ $flink = new Foreign_link();
+
+ $flink->user_id = $user->id;
+ $flink->foreign_id = $twitter_user->id;
+ $flink->service = TWITTER_SERVICE;
+ $flink->token = $atok->key;
+ $flink->credentials = $atok->secret;
+ $flink->created = common_sql_now();
+
+ $flink->set_flags(true, false, false, false);
+
+ $flink_id = $flink->insert();
+
+ if (empty($flink_id)) {
+ common_log_db_error($flink, 'INSERT', __FILE__);
+ $this->serverError(_('Couldn\'t link your Twitter account.'));
+ }
+
+ save_twitter_user($twitter_user->id, $twitter_user->screen_name);
+
+ // clean up the the mess we made in the session
+
+ unset($_SESSION['twitter_request_token']);
+ unset($_SESSION['twitter_request_token_secret']);
+
+ common_redirect(common_local_url('twittersettings'));
+ }
+ }
+
+}
+