gnu-social/plugins/TwitterBridge/twitter.php

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<?php
/*
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* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2008-2010 StatusNet, Inc.
*
* 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/>.
*/
if (!defined('STATUSNET') && !defined('LACONICA')) {
exit(1);
}
define('TWITTER_SERVICE', 1); // Twitter is foreign_service ID 1
require_once INSTALLDIR . '/plugins/TwitterBridge/twitteroauthclient.php';
function add_twitter_user($twitter_id, $screen_name)
{
// Clear out any bad old foreign_users with the new user's legit URL
// This can happen when users move around or fakester accounts get
// repoed, and things like that.
$luser = Foreign_user::getForeignUser($twitter_id, TWITTER_SERVICE);
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if (!empty($luser)) {
$result = $luser->delete();
if ($result != false) {
common_log(
LOG_INFO,
"Twitter bridge - removed old Twitter user: $screen_name ($twitter_id)."
);
}
}
$fuser = new Foreign_user();
$fuser->nickname = $screen_name;
$fuser->uri = 'http://twitter.com/' . $screen_name;
$fuser->id = $twitter_id;
$fuser->service = TWITTER_SERVICE;
$fuser->created = common_sql_now();
$result = $fuser->insert();
if (empty($result)) {
common_log(LOG_WARNING,
"Twitter bridge - failed to add new Twitter user: $twitter_id - $screen_name.");
common_log_db_error($fuser, 'INSERT', __FILE__);
} else {
common_log(LOG_INFO,
"Twitter bridge - Added new Twitter user: $screen_name ($twitter_id).");
}
return $result;
}
// Creates or Updates a Twitter user
function save_twitter_user($twitter_id, $screen_name)
{
// Check to see whether the Twitter user is already in the system,
// and update its screen name and uri if so.
$fuser = Foreign_user::getForeignUser($twitter_id, TWITTER_SERVICE);
if (!empty($fuser)) {
// Delete old record if Twitter user changed screen name
if ($fuser->nickname != $screen_name) {
$oldname = $fuser->nickname;
$fuser->delete();
common_log(LOG_INFO, sprintf('Twitter bridge - Updated nickname (and URI) ' .
'for Twitter user %1$d - %2$s, was %3$s.',
$fuser->id,
$screen_name,
$oldname));
}
} else {
// Kill any old, invalid records for this screen name
$fuser = Foreign_user::getByNickname($screen_name, TWITTER_SERVICE);
if (!empty($fuser)) {
$fuser->delete();
common_log(
LOG_INFO,
sprintf(
'Twitter bridge - deteted old record for Twitter ' .
'screen name "%s" belonging to Twitter ID %d.',
$screen_name,
$fuser->id
)
);
}
}
return add_twitter_user($twitter_id, $screen_name);
}
function is_twitter_bound($notice, $flink) {
// Check to see if notice should go to Twitter
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if (!empty($flink) && ($flink->noticesync & FOREIGN_NOTICE_SEND)) {
// If it's not a Twitter-style reply, or if the user WANTS to send replies,
// or if it's in reply to a twitter notice
if (!preg_match('/^@[a-zA-Z0-9_]{1,15}\b/u', $notice->content) ||
($flink->noticesync & FOREIGN_NOTICE_SEND_REPLY) ||
is_twitter_notice($notice->reply_to)) {
return true;
}
}
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return false;
}
function is_twitter_notice($id)
{
$n2s = Notice_to_status::staticGet('notice_id', $id);
return (!empty($n2s));
}
/**
* Pull the formatted status ID number from a Twitter status object
* returned via JSON from Twitter API.
*
* Encapsulates checking for the id_str attribute, which is required
* to read 64-bit "Snowflake" ID numbers on a 32-bit system -- the
* integer id attribute gets corrupted into a double-precision float,
* losing a few digits of precision.
*
* Warning: avoid performing arithmetic or direct comparisons with
* this number, as it may get coerced back to a double on 32-bit.
*
* @param object $status
* @param string $field base field name if not 'id'
* @return mixed id number as int or string
*/
function twitter_id($status, $field='id')
{
$field_str = "{$field}_str";
if (isset($status->$field_str)) {
// String version of the id -- required on 32-bit systems
// since the 64-bit numbers get corrupted as ints.
return $status->$field_str;
} else {
return $status->$field;
}
}
/**
* Check if we need to broadcast a notice over the Twitter bridge, and
* do so if necessary. Will determine whether to do a straight post or
* a repeat/retweet
*
* This function is meant to be called directly from TwitterQueueHandler.
*
* @param Notice $notice
* @return boolean true if complete or successful, false if we should retry
*/
function broadcast_twitter($notice)
{
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$flink = Foreign_link::getByUserID($notice->profile_id,
TWITTER_SERVICE);
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// Don't bother with basic auth, since it's no longer allowed
if (!empty($flink) && TwitterOAuthClient::isPackedToken($flink->credentials)) {
if (is_twitter_bound($notice, $flink)) {
if (!empty($notice->repeat_of) && is_twitter_notice($notice->repeat_of)) {
$retweet = retweet_notice($flink, Notice::staticGet('id', $notice->repeat_of));
if (is_object($retweet)) {
Notice_to_status::saveNew($notice->id, twitter_id($retweet));
return true;
} else {
// Our error processing will have decided if we need to requeue
// this or can discard safely.
return $retweet;
}
} else {
return broadcast_oauth($notice, $flink);
}
}
}
return true;
}
/**
* Send a retweet to Twitter for a notice that has been previously bridged
* in or out.
*
* Warning: the return value is not guaranteed to be an object; some error
* conditions will return a 'true' which should be passed on to a calling
* queue handler.
*
* No local information about the resulting retweet is saved: it's up to
* caller to save new mappings etc if appropriate.
*
* @param Foreign_link $flink
* @param Notice $notice
* @return mixed object with resulting Twitter status data on success, or true/false/null on error conditions.
*/
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function retweet_notice($flink, $notice)
{
$token = TwitterOAuthClient::unpackToken($flink->credentials);
$client = new TwitterOAuthClient($token->key, $token->secret);
$id = twitter_status_id($notice);
if (empty($id)) {
common_log(LOG_WARNING, "Trying to retweet notice {$notice->id} with no known status id.");
return null;
}
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try {
$status = $client->statusesRetweet($id);
return $status;
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} catch (OAuthClientException $e) {
return process_error($e, $flink, $notice);
}
}
function twitter_status_id($notice)
{
$n2s = Notice_to_status::staticGet('notice_id', $notice->id);
if (empty($n2s)) {
return null;
} else {
return $n2s->status_id;
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}
}
/**
* Pull any extra information from a notice that we should transfer over
* to Twitter beyond the notice text itself.
*
* @param Notice $notice
* @return array of key-value pairs for Twitter update submission
* @access private
*/
function twitter_update_params($notice)
{
$params = array();
if ($notice->lat || $notice->lon) {
$params['lat'] = $notice->lat;
$params['long'] = $notice->lon;
}
if (!empty($notice->reply_to) && is_twitter_notice($notice->reply_to)) {
$reply = Notice::staticGet('id', $notice->reply_to);
$params['in_reply_to_status_id'] = twitter_status_id($reply);
}
return $params;
}
function broadcast_oauth($notice, $flink) {
$user = $flink->getUser();
$statustxt = format_status($notice);
$params = twitter_update_params($notice);
$token = TwitterOAuthClient::unpackToken($flink->credentials);
$client = new TwitterOAuthClient($token->key, $token->secret);
$status = null;
try {
$status = $client->statusesUpdate($statustxt, $params);
if (!empty($status)) {
Notice_to_status::saveNew($notice->id, twitter_id($status));
}
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} catch (OAuthClientException $e) {
return process_error($e, $flink, $notice);
}
if (empty($status)) {
// This could represent a failure posting,
// or the Twitter API might just be behaving flakey.
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$errmsg = sprintf('Twitter bridge - No data returned by Twitter API when ' .
'trying to post notice %d for User %s (user id %d).',
$notice->id,
$user->nickname,
$user->id);
common_log(LOG_WARNING, $errmsg);
return false;
}
// Notice crossed the great divide
$msg = sprintf('Twitter bridge - posted notice %d to Twitter using ' .
'OAuth for User %s (user id %d).',
$notice->id,
$user->nickname,
$user->id);
common_log(LOG_INFO, $msg);
return true;
}
function process_error($e, $flink, $notice)
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{
$user = $flink->getUser();
$code = $e->getCode();
$logmsg = sprintf('Twitter bridge - %d posting notice %d for ' .
'User %s (user id: %d): %s.',
$code,
$notice->id,
$user->nickname,
$user->id,
$e->getMessage());
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common_log(LOG_WARNING, $logmsg);
// http://dev.twitter.com/pages/responses_errors
switch($code) {
case 400:
// Probably invalid data (bad Unicode chars or coords) that
// cannot be resolved by just sending again.
//
// It could also be rate limiting, but retrying immediately
// won't help much with that, so we'll discard for now.
// If a facility for retrying things later comes up in future,
// we can detect the rate-limiting headers and use that.
//
// Discard the message permanently.
return true;
break;
case 401:
// Probably a revoked or otherwise bad access token - nuke!
remove_twitter_link($flink);
return true;
break;
case 403:
// User has exceeder her rate limit -- toss the notice
return true;
break;
case 404:
// Resource not found. Shouldn't happen much on posting,
// but just in case!
//
// Consider it a matter for tossing the notice.
return true;
break;
default:
// For every other case, it's probably some flakiness so try
// sending the notice again later (requeue).
return false;
break;
}
}
function format_status($notice)
{
// Start with the plaintext source of this notice...
$statustxt = $notice->content;
// Convert !groups to #hashes
// XXX: Make this an optional setting?
$statustxt = preg_replace('/(^|\s)!([A-Za-z0-9]{1,64})/', "\\1#\\2", $statustxt);
// Twitter still has a 140-char hardcoded max.
if (mb_strlen($statustxt) > 140) {
$noticeUrl = common_shorten_url($notice->uri);
$urlLen = mb_strlen($noticeUrl);
$statustxt = mb_substr($statustxt, 0, 140 - ($urlLen + 3)) . ' … ' . $noticeUrl;
}
return $statustxt;
}
function remove_twitter_link($flink)
{
$user = $flink->getUser();
common_log(LOG_INFO, 'Removing Twitter bridge Foreign link for ' .
"user $user->nickname (user id: $user->id).");
$result = $flink->safeDelete();
if (empty($result)) {
common_log(LOG_ERR, 'Could not remove Twitter bridge ' .
"Foreign_link for $user->nickname (user id: $user->id)!");
common_log_db_error($flink, 'DELETE', __FILE__);
}
// Notify the user that her Twitter bridge is down
if (isset($user->email)) {
$result = mail_twitter_bridge_removed($user);
if (!$result) {
$msg = 'Unable to send email to notify ' .
"$user->nickname (user id: $user->id) " .
'that their Twitter bridge link was ' .
'removed!';
common_log(LOG_WARNING, $msg);
}
}
}
/**
* Send a mail message to notify a user that her Twitter bridge link
* has stopped working, and therefore has been removed. This can
* happen when the user changes her Twitter password, or otherwise
* revokes access.
*
* @param User $user user whose Twitter bridge link has been removed
*
* @return boolean success flag
*/
function mail_twitter_bridge_removed($user)
{
$profile = $user->getProfile();
common_switch_locale($user->language);
$subject = sprintf(_m('Your Twitter bridge has been disabled.'));
$site_name = common_config('site', 'name');
$body = sprintf(_m('Hi, %1$s. We\'re sorry to inform you that your ' .
'link to Twitter has been disabled. We no longer seem to have ' .
'permission to update your Twitter status. Did you maybe revoke ' .
'%3$s\'s access?' . "\n\n" .
'You can re-enable your Twitter bridge by visiting your ' .
"Twitter settings page:\n\n\t%2\$s\n\n" .
"Regards,\n%3\$s"),
$profile->getBestName(),
common_local_url('twittersettings'),
common_config('site', 'name'));
common_switch_locale();
return mail_to_user($user, $subject, $body);
}