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<?php
/**
* Common library of functions used by Twitter Services.
*
* @package TwitterService
* @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
* @copyright Curverider Ltd 2008-2010
*/
/**
* Tests if the system admin has enabled Sign-On-With-Twitter
*
* @param void
* @return bool
*/
function twitterservice_allow_sign_on_with_twitter() {
if (!$consumer_key = elgg_get_plugin_setting('consumer_key', 'twitterservice')) {
return FALSE;
}
if (!$consumer_secret = elgg_get_plugin_setting('consumer_secret', 'twitterservice')) {
return FALSE;
}
return elgg_get_plugin_setting('sign_on', 'twitterservice') == 'yes';
}
function twitterservice_forward() {
// sanity check
if (!twitterservice_allow_sign_on_with_twitter()) {
forward();
}
$callback = elgg_normalize_url("pg/twitterservice/login");
$request_link = twitterservice_get_authorize_url($callback);
forward($request_link);
}
function twitterservice_login() {
// sanity check
if (!twitterservice_allow_sign_on_with_twitter()) {
forward();
}
$token = twitterservice_get_access_token(get_input('oauth_verifier'));
if (!isset($token['oauth_token']) or !isset($token['oauth_token_secret'])) {
register_error(elgg_echo('twitterservice:login:error'));
forward();
}
// attempt to find user
$values = array(
'plugin:settings:twitterservice:access_key' => $token['oauth_token'],
'plugin:settings:twitterservice:access_secret' => $token['oauth_token_secret'],
);
if (!$users = get_entities_from_private_setting_multi($values, 'user', '', 0, '', 0)) {
// need Twitter account credentials
$consumer_key = elgg_get_plugin_setting('consumer_key', 'twitterservice');
$consumer_secret = elgg_get_plugin_setting('consumer_secret', 'twitterservice');
$api = new TwitterOAuth($consumer_key, $consumer_secret, $token['oauth_token'], $token['oauth_token_secret']);
$twitter = $api->get('account/verify_credentials');
// backward compatibility for stalled-development Twitter Login plugin
$user = FALSE;
if ($twitter_user = get_user_by_username($token['screen_name'])) {
if (($screen_name = $twitter_user->twitter_screen_name) && ($screen_name == $token['screen_name'])) {
// convert existing account
$user = $twitter_user;
$forward = '';
}
}
// create new user
if (!$user) {
// check new registration allowed
if (!elgg_get_config('allow_registration')) {
register_error(elgg_echo('registerdisabled'));
forward();
}
// trigger a hook for plugin authors to intercept
if (!trigger_plugin_hook('new_twitter_user', 'twitter_service', array('account' => $twitter), TRUE)) {
// halt execution
register_error(elgg_echo('twitterservice:login:error'));
forward();
}
// Elgg-ify Twitter credentials
$username = "{$twitter->screen_name}_twitter";
$display_name = $twitter->name;
$password = generate_random_cleartext_password();
// @hack Temporary, junk email account to allow user creation
$email = "$username@elgg.com";
try {
// create new account
if (!$user_id = register_user($username, $password, $display_name, $email)) {
register_error(elgg_echo('registerbad'));
forward();
}
} catch (RegistrationException $r) {
register_error($r->getMessage());
forward();
}
$user = new ElggUser($user_id);
// @hack Remove temporary email and forward to user settings page
// @todo Consider using a view to force valid email
$site_name = elgg_get_site_entity()->name;
system_message(elgg_echo('twitterservice:login:email', array($site_name)));
$user->email = '';
$user->save();
$forward = "pg/settings/user/{$user->username}";
}
// set twitter services tokens
elgg_set_plugin_user_setting('twitter_name', $token['screen_name'], $user->guid);
elgg_set_plugin_user_setting('access_key', $token['oauth_token'], $user->guid);
elgg_set_plugin_user_setting('access_secret', $token['oauth_token_secret'], $user->guid);
// pull in Twitter icon
twitterservice_update_user_avatar($user, $twitter->profile_image_url);
// login new user
if (login($user)) {
system_message(elgg_echo('twitterservice:login:success'));
} else {
system_message(elgg_echo('twitterservice:login:error'));
}
forward($forward);
} elseif (count($users) == 1) {
if (login($users[0])) {
system_message(elgg_echo('twitterservice:login:success'));
} else {
system_message(elgg_echo('twitterservice:login:error'));
}
forward();
}
// register login error
register_error(elgg_echo('twitterservice:login:error'));
forward();
}
function twitterservice_update_user_avatar($user, $file_location) {
$sizes = array(
'topbar' => array(16, 16, TRUE),
'tiny' => array(25, 25, TRUE),
'small' => array(40, 40, TRUE),
'medium' => array(100, 100, TRUE),
'large' => array(200, 200, FALSE),
'master' => array(550, 550, FALSE),
);
$filehandler = new ElggFile();
$filehandler->owner_guid = $user->getGUID();
foreach ($sizes as $size => $dimensions) {
$image = get_resized_image_from_existing_file(
$file_location,
$dimensions[0],
$dimensions[1],
$dimensions[2]
);
$filehandler->setFilename("profile/$user->username$size.jpg");
$filehandler->open('write');
$filehandler->write($image);
$filehandler->close();
}
return TRUE;
}
/**
* User-initiated Twitter authorization
*
* Callback action from Twitter registration. Registers a single Elgg user with
* the authorization tokens. Will revoke access from previous users when a
* conflict exists.
*
* Depends upon {@link twitterservice_get_authorize_url} being called previously
* to establish session request tokens.
*/
function twitterservice_authorize() {
$token = twitterservice_get_access_token();
if (!isset($token['oauth_token']) || !isset($token['oauth_token_secret'])) {
register_error(elgg_echo('twitterservice:authorize:error'));
forward('pg/settings/plugins');
}
// only one user per tokens
$values = array(
'plugin:settings:twitterservice:access_key' => $token['oauth_token'],
'plugin:settings:twitterservice:access_secret' => $token['oauth_token_secret'],
);
if ($users = get_entities_from_private_setting_multi($values, 'user', '', 0, '', 0)) {
foreach ($users as $user) {
// revoke access
clear_plugin_usersetting('twitter_name', $user->getGUID());
clear_plugin_usersetting('access_key', $user->getGUID());
clear_plugin_usersetting('access_secret', $user->getGUID());
}
}
// register user's access tokens
elgg_set_plugin_user_setting('twitter_name', $token['screen_name']);
elgg_set_plugin_user_setting('access_key', $token['oauth_token']);
elgg_set_plugin_user_setting('access_secret', $token['oauth_token_secret']);
system_message(elgg_echo('twitterservice:authorize:success'));
forward('pg/settings/plugins');
}
function twitterservice_revoke() {
// unregister user's access tokens
clear_plugin_usersetting('twitter_name');
clear_plugin_usersetting('access_key');
clear_plugin_usersetting('access_secret');
system_message(elgg_echo('twitterservice:revoke:success'));
forward('pg/settings/plugins');
}
function twitterservice_get_authorize_url($callback=NULL) {
global $SESSION;
$consumer_key = elgg_get_plugin_setting('consumer_key', 'twitterservice');
$consumer_secret = elgg_get_plugin_setting('consumer_secret', 'twitterservice');
// request tokens from Twitter
$twitter = new TwitterOAuth($consumer_key, $consumer_secret);
$token = $twitter->getRequestToken($callback);
// save token in session for use after authorization
$SESSION['twitterservice'] = array(
'oauth_token' => $token['oauth_token'],
'oauth_token_secret' => $token['oauth_token_secret'],
);
return $twitter->getAuthorizeURL($token['oauth_token']);
}
function twitterservice_get_access_token($oauth_verifier=FALSE) {
global $SESSION;
$consumer_key = elgg_get_plugin_setting('consumer_key', 'twitterservice');
$consumer_secret = elgg_get_plugin_setting('consumer_secret', 'twitterservice');
// retrieve stored tokens
$oauth_token = $SESSION['twitterservice']['oauth_token'];
$oauth_token_secret = $SESSION['twitterservice']['oauth_token_secret'];
$SESSION->offsetUnset('twitterservice');
// fetch an access token
$api = new TwitterOAuth($consumer_key, $consumer_secret, $oauth_token, $oauth_token_secret);
return $api->getAccessToken($oauth_verifier);
}
|
