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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 Twitter
+ * @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 for doing OAuth authentication against Twitter
+ *
+ * Peforms the OAuth "dance" between Laconica and Twitter -- requests a token,
+ * authorizes it, and exchanges it for an access token. It also creates a link
+ * (Foreign_link) between the Laconica user and Twitter user and stores the
+ * access token and secret in the link.
+ *
+ * @category Twitter
+ * @package Laconica
+ * @author Zach Copley <zach@controlyourself.ca>
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link http://laconi.ca/
+ *
+ */
+class TwitterauthorizationAction extends Action
+{
+ /**
+ * Initialize class members. Looks for 'oauth_token' parameter.
+ *
+ * @param array $args misc. arguments
+ *
+ * @return boolean true
+ */
+ function prepare($args)
+ {
+ parent::prepare($args);
+
+ $this->oauth_token = $this->arg('oauth_token');
+
+ return true;
+ }
+
+ /**
+ * Handler method
+ *
+ * @param array $args is ignored since it's now passed in in prepare()
+ *
+ * @return nothing
+ */
+ function handle($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)) {
+ $this->authorizeRequestToken();
+ } else {
+ $this->saveAccessToken();
+ }
+ }
+
+ /**
+ * Asks Twitter for a request token, and then redirects to Twitter
+ * to authorize it.
+ *
+ * @return nothing
+ */
+ function authorizeRequestToken()
+ {
+ try {
+
+ // Get a new request token and authorize it
+
+ $client = new TwitterOAuthClient();
+ $req_tok =
+ $client->getRequestToken(TwitterOAuthClient::$requestTokenURL);
+
+ // Sock the request token away in the session temporarily
+
+ $_SESSION['twitter_request_token'] = $req_tok->key;
+ $_SESSION['twitter_request_token_secret'] = $req_tok->secret;
+
+ $auth_link = $client->getAuthorizeLink($req_tok);
+
+ } catch (TwitterOAuthClientException $e) {
+ $msg = sprintf('OAuth client cURL error - code: %1s, msg: %2s',
+ $e->getCode(), $e->getMessage());
+ $this->serverError(_('Couldn\'t link your Twitter account.'));
+ }
+
+ common_redirect($auth_link);
+ }
+
+ /**
+ * Called when Twitter returns an authorized request token. Exchanges
+ * it for an access token and stores it.
+ *
+ * @return nothing
+ */
+ function saveAccessToken()
+ {
+
+ // Check to make sure Twitter returned the same request
+ // token we sent them
+
+ if ($_SESSION['twitter_request_token'] != $this->oauth_token) {
+ $this->serverError(_('Couldn\'t link your Twitter account.'));
+ }
+
+ try {
+
+ $client = new TwitterOAuthClient($_SESSION['twitter_request_token'],
+ $_SESSION['twitter_request_token_secret']);
+
+ // Exchange the request token for an access token
+
+ $atok = $client->getAccessToken(TwitterOAuthClient::$accessTokenURL);
+
+ // Test the access token and get the user's Twitter info
+
+ $client = new TwitterOAuthClient($atok->key, $atok->secret);
+ $twitter_user = $client->verifyCredentials();
+
+ } catch (OAuthClientException $e) {
+ $msg = sprintf('OAuth client cURL error - code: %1$s, msg: %2$s',
+ $e->getCode(), $e->getMessage());
+ $this->serverError(_('Couldn\'t link your Twitter account.'));
+ }
+
+ // Save the access token and Twitter user info
+
+ $this->saveForeignLink($atok, $twitter_user);
+
+ // Clean up the the mess we made in the session
+
+ unset($_SESSION['twitter_request_token']);
+ unset($_SESSION['twitter_request_token_secret']);
+
+ common_redirect(common_local_url('twittersettings'));
+ }
+
+ /**
+ * Saves a Foreign_link between Twitter user and local user,
+ * which includes the access token and secret.
+ *
+ * @param OAuthToken $access_token the access token to save
+ * @param mixed $twitter_user twitter API user object
+ *
+ * @return nothing
+ */
+ function saveForeignLink($access_token, $twitter_user)
+ {
+ $user = common_current_user();
+
+ $flink = new Foreign_link();
+
+ $flink->user_id = $user->id;
+ $flink->foreign_id = $twitter_user->id;
+ $flink->service = TWITTER_SERVICE;
+
+ $creds = TwitterOAuthClient::packToken($access_token);
+
+ $flink->credentials = $creds;
+ $flink->created = common_sql_now();
+
+ // Defaults: noticesync on, everything else off
+
+ $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);
+ }
+
+}
+
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