]> git.mxchange.org Git - quix0rs-gnu-social.git/blobdiff - actions/twittersettings.php
Added configuration options to enable/disable SMS and Twitter integration.
[quix0rs-gnu-social.git] / actions / twittersettings.php
index d8eb7aba0873e3a4483d2926106fdf0634ea6292..3343dba95a20d240a0a42f1ab14ae97e650e6223 100644 (file)
@@ -1,9 +1,12 @@
 <?php
-/*
- * Laconica - a distributed open-source microblogging tool
- * Copyright (C) 2008, Controlez-Vous, Inc.
+/**
+ * Laconica, the distributed open-source microblogging tool
  *
- * This program is free software: you can redistribute it and/or modify
+ * Settings for Twitter integration
+ *
+ * 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.
  *
  * 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  Settings
+ * @package   Laconica
+ * @author    Evan Prodromou <evan@controlyourself.ca>
+ * @copyright 2008-2009 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);
+}
+
+require_once INSTALLDIR.'/lib/connectsettingsaction.php';
+require_once INSTALLDIR.'/lib/twitter.php';
+
+define('SUBSCRIPTIONS', 80);
+
+/**
+ * Settings for Twitter integration
+ *
+ * @category Settings
+ * @package  Laconica
+ * @author   Evan Prodromou <evan@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/
+ *
+ * @see      SettingsAction
  */
 
-if (!defined('LACONICA')) { exit(1); }
-
-require_once(INSTALLDIR.'/lib/settingsaction.php');
-
-class TwittersettingsAction extends SettingsAction {
-
-       function get_instructions() {
-               return _('Add your Twitter account to automatically send your notices to Twitter, ' .
-                       'and subscribe to Twitter friends already here.');
-       }
-
-       function show_form($msg=NULL, $success=false) {
-               $user = common_current_user();
-               $profile = $user->getProfile();
-               $fuser = NULL;
-               $flink = Foreign_link::getForeignLink($user->id, 1); // 1 == Twitter
-
-               if ($flink) {
-                       $fuser = Foreign_user::getForeignUser($flink->foreign_id, 1);
-               }
-
-               $this->form_header(_('Twitter settings'), $msg, $success);
-               common_element_start('form', array('method' => 'post',
-                                                                                  'id' => 'twittersettings',
-                                                                                  'action' =>
-                                                                                  common_local_url('twittersettings')));
-               common_hidden('token', common_session_token());
-
-               common_element('h2', NULL, _('Twitter Account'));
-
-               if ($fuser) {
-                       common_element_start('p');
-
-                       common_element('span', 'twitter_user', $fuser->nickname);
-                       common_element('a', array('href' => $fuser->uri),  $fuser->uri);
-                       common_element('span', 'input_instructions',
-                                      _('Current verified Twitter account.'));
-                       common_hidden('flink_foreign_id', $flink->foreign_id);
-                       common_element_end('p');
-                       common_submit('remove', _('Remove'));
-               } else {
-
-                       // XXX: Should we make an educated guess as to the twitter acct name? -- Zach
-                       common_input('twitter_username', _('Twitter Username'),
-                                                ($this->arg('twitter_username')) ? $this->arg('twitter_username') : $profile->nickname,
-                                                _('No spaces, please.')); // hey, it's what Twitter says
-
-                       common_password('twitter_password', _('Twitter Password'));
-               }
-
-               common_element('h2', NULL, _('Preferences'));
-
-               if ($flink) {
-                       common_checkbox('noticesync', _('Automatically send my notices to Twitter.'),
-                               ($flink->noticesync > 0) ? true : false);
-
-                       common_checkbox('replysync', _('Don\'t send local "@" replies to Twitter.'),
-                               ($flink->noticesync == 3) ? true : false, NULL, 'true');
-
-                       common_checkbox('friendsync', _('Subscribe to my Twitter friends here.'),
-                               ($flink->friendsync) ? true : false, NULL, 'true', true);
-
-                       common_submit('save', _('Save'));
-               } else {
-                       common_checkbox('noticesync', _('Automatically send my notices to Twitter.'), true);
-                       common_checkbox('replysync', _('Don\'t send local "@" replies to Twitter.'), false, NULL, 'true');
-                       common_checkbox('friendsync', _('Subscribe to my Twitter friends here.'), false, NULL, 'true', true);
-                       common_submit('add', _('Add'));
-               }
-
-               common_element_end('form');
-               common_show_footer();
-       }
-
-       function handle_post() {
-
-               # CSRF protection
-               $token = $this->trimmed('token');
-               if (!$token || $token != common_session_token()) {
-                       $this->show_form(_('There was a problem with your session token. Try again, please.'));
-                       return;
-               }
-
-               if ($this->arg('save')) {
-                       $this->save_preferences();
-               } else if ($this->arg('add')) {
-                       $this->add_twitter_acct();
-               } else if ($this->arg('remove')) {
-                       $this->remove_twitter_acct();
-               } else {
-                       $this->show_form(_('Unexpected form submission.'));
-               }
-       }
-
-       function add_twitter_acct() {
-               $twitter_username = $this->trimmed('twitter_username');
-               $twitter_password = $this->trimmed('twitter_password');
-               $noticesync = $this->boolean('noticesync');
-               $replysync = $this->boolean('replysync');
-               $friendsync = $this->boolean('friendsync');
-
-               if (!Validate::string($twitter_username, array('min_length' => 1,
-                                                                                                          'max_length' => 15,
-                                                                                                          'format' => VALIDATE_NUM . VALIDATE_ALPHA . '_'))) {
-                       $this->show_form(_('Username must have only numbers, upper- and lowercase letters, and underscore (_). 15 chars max.'));
-                       return;
-               }
-
-               // Verify this is a real Twitter user.
-               if (!$this->verify_credentials($twitter_username, $twitter_password)) {
-                       $this->show_form(_('Could not verify your Twitter credentials!'));
-                       return;
-               }
-
-               // Now that we have a valid Twitter user, we have to make another api call to
-               // find its Twitter ID.  Dumb, but true.
-               $twitter_id = $this->get_twitter_id($twitter_username, $twitter_password);
-
-               if (!$twitter_id) {
-                       $this->show_form(sprintf(_('Unable to retrieve account information for "%s" from Twitter.'), $twitter_username));
-                       return;
-               }
-
-               $fuser = DB_DataObject::factory('foreign_user');
-               $fuser->id = $twitter_id;
-               $fuser->service = 1; // Twitter
-               $fuser->uri = "http://www.twitter.com/$twitter_username";
-               $fuser->nickname = $twitter_username;
-               $fuser->created = common_sql_now();
-               $result = $fuser->insert();
-
-               if (!$result) {
-                       common_log_db_error($fuser, 'INSERT', __FILE__);
-                       $this->show_form(_('Unable to save your Twitter settings!'));
-                       return;
-               }
-
-               $user = common_current_user();
-
-               $flink = DB_DataObject::factory('foreign_link');
-               $flink->user_id = $user->id;
-               $flink->foreign_id = $fuser->id;
-               $flink->service = 1; // Twitter
-               $flink->credentials = $twitter_password;
-               $flink->created = common_sql_now();
-
-               if ($noticesync) {
-                       if ($replysync) {
-                               $flink->noticesync = 3;
-                       } else {
-                               $flink->noticesync = 1;
-                       }
-               } else {
-                       $flink->noticesync = 0;
-               }
-
-               $flink->friendsync = ($friendsync) ? 2 : 0;
-               $flink->profilesync = 0; // XXX: leave as default?
-               $flink_id = $flink->insert();
-
-               if (!$flink_id) {
-                       common_log_db_error($flink, 'INSERT', __FILE__);
-                       $this->show_form(_('Unable to save your Twitter settings!'));
-                       return;
-               }
-
-               $this->show_form(_('Twitter settings saved.'), true);
-       }
-
-       function remove_twitter_acct() {
-               $user = common_current_user();
-
-               // For now we assume one Twitter acct per Laconica acct
-               $flink = Foreign_link::getForeignLink($user->id, 1);
-               $fuser = Foreign_user::getForeignUser($flink->foreign_id, 1);
-               $flink_foreign_id = $this->arg('flink_foreign_id');
-
-               if (!$flink) {
-                       common_debug("couldn't get flink");
-               }
-
-               # Maybe an old tab open...?
-               if ($flink->foreign_id != $flink_foreign_id) {
-                       common_debug("flink user_id = " . $flink->user_id);
-                   $this->show_form(_('That is not your Twitter account.'));
-                   return;
-               }
-
-               $result = $fuser->delete();
-
-               if (!$result) {
-                       common_log_db_error($fuser, 'DELETE', __FILE__);
-                       $this->show_form(_('Couldn\'t remove Twitter user.'));
-                       return;
-               }
-
-               $result = $flink->delete();
-
-               if (!$result) {
-                       common_log_db_error($flink, 'DELETE', __FILE__);
-                       common_server_error(_('Couldn\'t remove Twitter user.'));
-                       return;
-               }
-
-               $this->show_form(_('Twitter account removed.'), TRUE);
-       }
-
-       function save_preferences() {
-               $noticesync = $this->boolean('noticesync');
-               $friendsync = $this->boolean('friendsync');
-               $replysync = $this->boolean('replysync');
-
-               $user = common_current_user();
-               $flink = Foreign_link::getForeignLink($user->id, 1);
-
-               if (!$flink) {
-                       common_log_db_error($flink, 'SELECT', __FILE__);
-                       $this->show_form(_('Couldn\'t save Twitter preferences.'));
-                       return;
-               }
-
-               if ($noticesync) {
-                       if ($replysync) {
-                               $flink->noticesync = 3;
-                       } else {
-                               $flink->noticesync = 1;
-                       }
-               } else {
-                       $flink->noticesync = 0;
-               }
-
-               $flink->friendsync = ($friendsync) ? 2 : 0;
-               // $flink->profilesync = 0; // XXX: leave as default?
-               $result = $flink->update();
-
-               if (!$result) {
-                       common_log_db_error($flink, 'UPDATE', __FILE__);
-                       $this->show_form(_('Couldn\'t save Twitter preferences.'));
-                       return;
-               }
-
-               $this->show_form(_('Twitter preferences saved.'));
-
-               return;
-       }
-
-       function get_twitter_id($user, $password) {
-               $uri = "http://twitter.com/users/show/$user.json";
-               $data = $this->get_twitter_data($uri, $user, $password);
-
-               if (!$data) {
-                       return NULL;
-               }
-
-               $user = json_decode($data);
-
-               if (!$user) {
-                       return NULL;
-               }
-
-               return $user->id;
-       }
-
-       function verify_credentials($user, $password) {
-               $uri = 'http://twitter.com/account/verify_credentials.json';
-               $data = $this->get_twitter_data($uri, $user, $password);
-
-               if (!$data) {
-                       return false;
-               }
-
-               $creds = json_decode($data);
-
-               if (!$creds) {
-                       return false;
-               }
-
-               if ($creds->authorized == 1) {
-                       return true;
-               }
-
-               return false;
-       }
-
-       // PHP's cURL the best thing to use here? -- Zach
-       function get_twitter_data($uri, $user=NULL, $password=NULL) {
-               $options = array(
-                               CURLOPT_USERPWD => "$user:$password",
-                               CURLOPT_RETURNTRANSFER  => true,
-                               CURLOPT_FAILONERROR             => true,
-                               CURLOPT_HEADER                  => false,
-                               CURLOPT_FOLLOWLOCATION  => true,
-                               // CURLOPT_USERAGENT            => "identi.ca",
-                               CURLOPT_CONNECTTIMEOUT  => 120,
-                               CURLOPT_TIMEOUT                 => 120
-               );
-
-               $ch = curl_init($uri);
-           curl_setopt_array($ch, $options);
-           $data = curl_exec($ch);
-           $errmsg = curl_error($ch);
-
-               if ($errmsg) {
-                       common_debug("cURL error: $errmsg - trying to load: $uri with user $user.", __FILE__);
-               }
-
-               curl_close($ch);
-
-               return $data;
-       }
-
-}
\ No newline at end of file
+class TwittersettingsAction extends ConnectSettingsAction
+{
+    /**
+     * Title of the page
+     *
+     * @return string Title of the page
+     */
+
+    function title()
+    {
+        return _('Twitter settings');
+    }
+
+    /**
+     * Instructions for use
+     *
+     * @return instructions for use
+     */
+
+    function getInstructions()
+    {
+        return _('Add your Twitter account to automatically send '.
+                 ' your notices to Twitter, ' .
+                 'and subscribe to Twitter friends already here.');
+    }
+
+    /**
+     * Content area of the page
+     *
+     * Shows a form for associating a Twitter account with this
+     * Laconica account. Also lets the user set preferences.
+     *
+     * @return void
+     */
+
+    function showContent()
+    {
+        if (!common_config('twitter', 'enabled')) {
+            $this->element('div', array('class' => 'error'),
+                           _('Twitter is not available.'));
+            return;
+        }
+
+        $user = common_current_user();
+
+        $profile = $user->getProfile();
+
+        $fuser = null;
+
+        $flink = Foreign_link::getByUserID($user->id, TWITTER_SERVICE);
+
+        if ($flink) {
+            $fuser = $flink->getForeignUser();
+        }
+
+        $this->elementStart('form', array('method' => 'post',
+                                          'id' => 'form_settings_twitter',
+                                          'class' => 'form_settings',
+                                          'action' =>
+                                          common_local_url('twittersettings')));
+        $this->elementStart('fieldset', array('id' => 'settings_twitter_account'));
+        $this->element('legend', null, _('Twitter Account'));
+        $this->hidden('token', common_session_token());
+        if ($fuser) {
+            $this->elementStart('ul', 'form_data');
+            $this->elementStart('li', array('id' => 'settings_twitter_remove'));
+            $this->element('span', 'twitter_user', $fuser->nickname);
+            $this->element('a', array('href' => $fuser->uri), $fuser->uri);
+            $this->element('p', 'form_note',
+                           _('Current verified Twitter account.'));
+            $this->hidden('flink_foreign_id', $flink->foreign_id);
+            $this->elementEnd('li');
+            $this->elementEnd('ul');
+            $this->submit('remove', _('Remove'));
+        } else {
+            $this->elementStart('ul', 'form_data');
+            $this->elementStart('li', array('id' => 'settings_twitter_login'));
+            $this->input('twitter_username', _('Twitter user name'),
+                         ($this->arg('twitter_username')) ?
+                         $this->arg('twitter_username') :
+                         $profile->nickname,
+                         _('No spaces, please.')); // hey, it's what Twitter says
+            $this->elementEnd('li');
+            $this->elementStart('li');
+            $this->password('twitter_password', _('Twitter password'));
+            $this->elementend('li');
+            $this->elementEnd('ul');
+        }
+        $this->elementEnd('fieldset');
+
+        $this->elementStart('fieldset',
+                            array('id' => 'settings_twitter_preferences'));
+        $this->element('legend', null, _('Preferences'));
+
+        $this->elementStart('ul', 'form_data');
+        $this->elementStart('li');
+        $this->checkbox('noticesend',
+                        _('Automatically send my notices to Twitter.'),
+                        ($flink) ?
+                        ($flink->noticesync & FOREIGN_NOTICE_SEND) :
+                        true);
+        $this->elementEnd('li');
+        $this->elementStart('li');
+        $this->checkbox('replysync',
+                        _('Send local "@" replies to Twitter.'),
+                        ($flink) ?
+                        ($flink->noticesync & FOREIGN_NOTICE_SEND_REPLY) :
+                        true);
+        $this->elementEnd('li');
+        $this->elementStart('li');
+        $this->checkbox('friendsync',
+                        _('Subscribe to my Twitter friends here.'),
+                        ($flink) ?
+                        ($flink->friendsync & FOREIGN_FRIEND_RECV) :
+                        false);
+        $this->elementEnd('li');
+
+        if (common_config('twitterbridge','enabled')) {
+            $this->elementStart('li');
+            $this->checkbox('noticerecv',
+                            _('Import my Friends Timeline.'),
+                            ($flink) ?
+                            ($flink->noticesync & FOREIGN_NOTICE_RECV) :
+                            false);
+            $this->elementEnd('li');
+        } else {
+            // preserve setting even if bidrection bridge toggled off
+            if ($flink && ($flink->noticesync & FOREIGN_NOTICE_RECV)) {
+                $this->hidden('noticerecv', true, 'noticerecv');
+            }
+        }
+
+        $this->elementEnd('ul');
+
+        if ($flink) {
+            $this->submit('save', _('Save'));
+        } else {
+            $this->submit('add', _('Add'));
+        }
+        $this->elementEnd('fieldset');
+
+        $this->showTwitterSubscriptions();
+
+        $this->elementEnd('form');
+    }
+
+    /**
+     * Gets some of the user's Twitter friends
+     *
+     * Gets the number of Twitter friends that are on this
+     * instance of Laconica.
+     *
+     * @return array array of User objects
+     */
+
+    function subscribedTwitterUsers()
+    {
+
+        $current_user = common_current_user();
+
+        $qry = 'SELECT "user".* ' .
+          'FROM subscription ' .
+          'JOIN "user" ON subscription.subscribed = "user".id ' .
+          'JOIN foreign_link ON foreign_link.user_id = "user".id ' .
+          'WHERE subscriber = %d ' .
+          'ORDER BY "user".nickname';
+
+        $user = new User();
+
+        $user->query(sprintf($qry, $current_user->id));
+
+        $users = array();
+
+        while ($user->fetch()) {
+
+            // Don't include the user's own self-subscription
+            if ($user->id != $current_user->id) {
+                $users[] = clone($user);
+            }
+        }
+
+        return $users;
+    }
+
+    /**
+     * Show user's Twitter friends
+     *
+     * Gets the number of Twitter friends that are on this
+     * instance of Laconica, and shows their mini-avatars.
+     *
+     * @return void
+     */
+
+    function showTwitterSubscriptions()
+    {
+
+        $friends = $this->subscribedTwitterUsers();
+
+        $friends_count = count($friends);
+
+        if ($friends_count > 0) {
+            $this->elementStart('div', array('id' => 'entity_subscriptions',
+                                             'class' => 'section'));
+            $this->element('h2', null, _('Twitter Friends'));
+            $this->elementStart('ul', 'entities users xoxo');
+
+            for ($i = 0; $i < min($friends_count, SUBSCRIPTIONS); $i++) {
+
+                $other = Profile::staticGet($friends[$i]->id);
+
+                if (!$other) {
+                    common_log_db_error($subs, 'SELECT', __FILE__);
+                    continue;
+                }
+
+                $this->elementStart('li', 'vcard');
+                $this->elementStart('a', array('title' => ($other->fullname) ?
+                                               $other->fullname :
+                                               $other->nickname,
+                                               'href' => $other->profileurl,
+                                               'class' => 'url'));
+
+                $avatar = $other->getAvatar(AVATAR_MINI_SIZE);
+
+                $avatar_url = ($avatar) ?
+                  $avatar->displayUrl() :
+                  Avatar::defaultImage(AVATAR_MINI_SIZE);
+
+                $this->element('img', array('src' => $avatar_url,
+                                            'width' => AVATAR_MINI_SIZE,
+                                            'height' => AVATAR_MINI_SIZE,
+                                            'class' => 'avatar photo',
+                                            'alt' =>  ($other->fullname) ?
+                                            $other->fullname :
+                                            $other->nickname));
+
+                $this->element('span', 'fn nickname', $other->nickname);
+                $this->elementEnd('a');
+                $this->elementEnd('li');
+
+            }
+
+            $this->elementEnd('ul');
+            $this->elementEnd('div');
+
+        }
+    }
+
+    /**
+     * Handle posts to this form
+     *
+     * Based on the button that was pressed, muxes out to other functions
+     * to do the actual task requested.
+     *
+     * All sub-functions reload the form with a message -- success or failure.
+     *
+     * @return void
+     */
+
+    function handlePost()
+    {
+
+        // CSRF protection
+        $token = $this->trimmed('token');
+        if (!$token || $token != common_session_token()) {
+            $this->showForm(_('There was a problem with your session token. '.
+                              'Try again, please.'));
+            return;
+        }
+
+        if ($this->arg('save')) {
+            $this->savePreferences();
+        } else if ($this->arg('add')) {
+            $this->addTwitterAccount();
+        } else if ($this->arg('remove')) {
+            $this->removeTwitterAccount();
+        } else {
+            $this->showForm(_('Unexpected form submission.'));
+        }
+    }
+
+    /**
+     * Associate a Twitter account with the user's account
+     *
+     * Validates post input; verifies it against Twitter; and if
+     * successful stores in the database.
+     *
+     * @return void
+     */
+
+    function addTwitterAccount()
+    {
+        $screen_name = $this->trimmed('twitter_username');
+        $password    = $this->trimmed('twitter_password');
+        $noticesend  = $this->boolean('noticesend');
+        $noticerecv  = $this->boolean('noticerecv');
+        $replysync   = $this->boolean('replysync');
+        $friendsync  = $this->boolean('friendsync');
+
+        if (!Validate::string($screen_name,
+                              array('min_length' => 1,
+                                    'max_length' => 15,
+                                    'format' => VALIDATE_NUM.VALIDATE_ALPHA.'_'))) {
+            $this->showForm(_('Username must have only numbers, '.
+                              'upper- and lowercase letters, '.
+                              'and underscore (_). 15 chars max.'));
+            return;
+        }
+
+        if (!$this->verifyCredentials($screen_name, $password)) {
+            $this->showForm(_('Could not verify your Twitter credentials!'));
+            return;
+        }
+
+        $twit_user = twitter_user_info($screen_name, $password);
+
+        if (!$twit_user) {
+            $this->showForm(sprintf(_('Unable to retrieve account information '.
+                                      'For "%s" from Twitter.'),
+                                    $screen_name));
+            return;
+        }
+
+        if (!save_twitter_user($twit_user->id, $screen_name)) {
+            $this->showForm(_('Unable to save your Twitter settings!'));
+            return;
+        }
+
+        $user = common_current_user();
+
+        $flink = new Foreign_link();
+
+        $flink->user_id     = $user->id;
+        $flink->foreign_id  = $twit_user->id;
+        $flink->service     = TWITTER_SERVICE;
+        $flink->credentials = $password;
+        $flink->created     = common_sql_now();
+
+        $flink->set_flags($noticesend, $noticerecv, $replysync, $friendsync);
+
+        $flink_id = $flink->insert();
+
+        if (!$flink_id) {
+            common_log_db_error($flink, 'INSERT', __FILE__);
+            $this->showForm(_('Unable to save your Twitter settings!'));
+            return;
+        }
+
+        if ($friendsync) {
+            save_twitter_friends($user, $twit_user->id, $screen_name, $password);
+            $flink->last_friendsync = common_sql_now();
+            $flink->update();
+        }
+
+        $this->showForm(_('Twitter settings saved.'), true);
+    }
+
+    /**
+     * Disassociate an existing Twitter account from this account
+     *
+     * @return void
+     */
+
+    function removeTwitterAccount()
+    {
+        $user = common_current_user();
+
+        $flink = Foreign_link::getByUserID($user->id, 1);
+
+        $flink_foreign_id = $this->arg('flink_foreign_id');
+
+        // Maybe an old tab open...?
+        if ($flink->foreign_id != $flink_foreign_id) {
+            $this->showForm(_('That is not your Twitter account.'));
+            return;
+        }
+
+        $result = $flink->delete();
+
+        if (!$result) {
+            common_log_db_error($flink, 'DELETE', __FILE__);
+            $this->serverError(_('Couldn\'t remove Twitter user.'));
+            return;
+        }
+
+        $this->showForm(_('Twitter account removed.'), true);
+    }
+
+    /**
+     * Save user's Twitter-bridging preferences
+     *
+     * @return void
+     */
+
+    function savePreferences()
+    {
+        $noticesend = $this->boolean('noticesend');
+        $noticerecv = $this->boolean('noticerecv');
+        $friendsync = $this->boolean('friendsync');
+        $replysync  = $this->boolean('replysync');
+
+        $user = common_current_user();
+
+        $flink = Foreign_link::getByUserID($user->id, 1);
+
+        if (!$flink) {
+            common_log_db_error($flink, 'SELECT', __FILE__);
+            $this->showForm(_('Couldn\'t save Twitter preferences.'));
+            return;
+        }
+
+        $twitter_id = $flink->foreign_id;
+        $password   = $flink->credentials;
+
+        $fuser = $flink->getForeignUser();
+
+        if (!$fuser) {
+            common_log_db_error($fuser, 'SELECT', __FILE__);
+            $this->showForm(_('Couldn\'t save Twitter preferences.'));
+            return;
+        }
+
+        $screen_name = $fuser->nickname;
+
+        $original = clone($flink);
+
+        $flink->set_flags($noticesend, $noticerecv, $replysync, $friendsync);
+
+        $result = $flink->update($original);
+
+        if ($result === false) {
+            common_log_db_error($flink, 'UPDATE', __FILE__);
+            $this->showForm(_('Couldn\'t save Twitter preferences.'));
+            return;
+        }
+
+        if ($friendsync) {
+            save_twitter_friends($user, $flink->foreign_id, $screen_name, $password);
+        }
+
+        $this->showForm(_('Twitter preferences saved.'), true);
+    }
+
+    /**
+     * Verifies a username and password against Twitter's API
+     *
+     * @param string $screen_name Twitter user name
+     * @param string $password    Twitter password
+     *
+     * @return boolean success flag
+     */
+
+    function verifyCredentials($screen_name, $password)
+    {
+        $uri = 'http://twitter.com/account/verify_credentials.json';
+
+        $data = get_twitter_data($uri, $screen_name, $password);
+
+        if (!$data) {
+            return false;
+        }
+
+        $user = json_decode($data);
+
+        if (!$user) {
+            return false;
+        }
+
+        $twitter_id = $user->id;
+
+        if ($twitter_id) {
+            return $twitter_id;
+        }
+
+        return false;
+    }
+
+}