forked from GNUsocial/gnu-social
483 lines
16 KiB
PHP
483 lines
16 KiB
PHP
<?php
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/*
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* StatusNet - the distributed open-source microblogging tool
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* Copyright (C) 2008-2011 StatusNet, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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if (!defined('STATUSNET') && !defined('LACONICA')) {
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exit(1);
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}
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define('TWITTER_SERVICE', 1); // Twitter is foreign_service ID 1
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function add_twitter_user($twitter_id, $screen_name)
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{
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// Clear out any bad old foreign_users with the new user's legit URL
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// This can happen when users move around or fakester accounts get
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// repoed, and things like that.
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try {
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$fuser = Foreign_user::getForeignUser($twitter_id, TWITTER_SERVICE);
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$result = $fuser->delete();
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if ($result != false) {
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common_log(
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LOG_INFO,
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"Twitter bridge - removed old Twitter user: $screen_name ($twitter_id)."
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);
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}
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} catch (NoResultException $e) {
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// no old foreign users exist for this id
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}
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$fuser = new Foreign_user();
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$fuser->nickname = $screen_name;
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$fuser->uri = 'http://twitter.com/' . $screen_name;
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$fuser->id = $twitter_id;
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$fuser->service = TWITTER_SERVICE;
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$fuser->created = common_sql_now();
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$result = $fuser->insert();
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if ($result === false) {
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common_log(LOG_WARNING, "Twitter bridge - failed to add new Twitter user: $twitter_id - $screen_name.");
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common_log_db_error($fuser, 'INSERT', __FILE__);
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} else {
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common_log(LOG_INFO,
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"Twitter bridge - Added new Twitter user: $screen_name ($twitter_id).");
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}
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return $result;
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}
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// Creates or Updates a Twitter user
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function save_twitter_user($twitter_id, $screen_name)
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{
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// Check to see whether the Twitter user is already in the system,
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// and update its screen name and uri if so.
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try {
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$fuser = Foreign_user::getForeignUser($twitter_id, TWITTER_SERVICE);
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// Delete old record if Twitter user changed screen name
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if ($fuser->nickname != $screen_name) {
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$oldname = $fuser->nickname;
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$fuser->delete();
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common_log(LOG_INFO, sprintf('Twitter bridge - Updated nickname (and URI) ' .
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'for Twitter user %1$d - %2$s, was %3$s.',
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$fuser->id,
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$screen_name,
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$oldname));
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}
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} catch (NoResultException $e) {
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// No old users exist for this id
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// Kill any old, invalid records for this screen name
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// XXX: Is this really only supposed to be run if the above getForeignUser fails?
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try {
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$fuser = Foreign_user::getByNickname($screen_name, TWITTER_SERVICE);
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$fuser->delete();
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common_log(
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LOG_INFO,
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sprintf(
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'Twitter bridge - deteted old record for Twitter ' .
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'screen name "%s" belonging to Twitter ID %d.',
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$screen_name,
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$fuser->id
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)
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);
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} catch (NoResultException $e) {
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// No old users exist for this screen_name
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}
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}
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return add_twitter_user($twitter_id, $screen_name);
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}
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function is_twitter_bound($notice, $flink) {
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// Don't send activity activities (at least for now)
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if ($notice->object_type == ActivityObject::ACTIVITY) {
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return false;
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}
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$allowedVerbs = array(ActivityVerb::POST);
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// Default behavior: always send repeats
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if (empty($flink))
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array_push($allowedVerbs, ActivityVerb::SHARE);
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// Otherwise, check to see if repeats are allowed
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else if (($flink->noticesync & FOREIGN_NOTICE_SEND_REPEAT) == FOREIGN_NOTICE_SEND_REPEAT)
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array_push($allowedVerbs, ActivityVerb::SHARE);
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// Don't send things that aren't posts or repeats (at least for now)
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if (!in_array($notice->verb, $allowedVerbs)) {
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return false;
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}
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// Check to see if notice should go to Twitter
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if (!empty($flink) && (($flink->noticesync & FOREIGN_NOTICE_SEND) == FOREIGN_NOTICE_SEND)) {
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// If it's not a Twitter-style reply, or if the user WANTS to send replies,
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// or if it's in reply to a twitter notice
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if ( (($flink->noticesync & FOREIGN_NOTICE_SEND_REPLY) == FOREIGN_NOTICE_SEND_REPLY) ||
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is_twitter_notice($notice->reply_to) || is_twitter_notice($notice->repeat_of) ||
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(empty($notice->reply_to) && !preg_match('/^@[a-zA-Z0-9_]{1,15}\b/u', $notice->content)) ){
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return true;
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}
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}
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return false;
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}
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function is_twitter_notice($id)
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{
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$n2s = Notice_to_status::getKV('notice_id', $id);
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return (!empty($n2s));
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}
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/**
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* Pull the formatted status ID number from a Twitter status object
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* returned via JSON from Twitter API.
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*
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* Encapsulates checking for the id_str attribute, which is required
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* to read 64-bit "Snowflake" ID numbers on a 32-bit system -- the
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* integer id attribute gets corrupted into a double-precision float,
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* losing a few digits of precision.
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*
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* Warning: avoid performing arithmetic or direct comparisons with
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* this number, as it may get coerced back to a double on 32-bit.
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*
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* @param object $status
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* @param string $field base field name if not 'id'
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* @return mixed id number as int or string
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*/
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function twitter_id($status, $field='id')
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{
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$field_str = "{$field}_str";
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if (isset($status->$field_str)) {
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// String version of the id -- required on 32-bit systems
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// since the 64-bit numbers get corrupted as ints.
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return $status->$field_str;
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} else {
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return $status->$field;
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}
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}
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/**
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* Check if we need to broadcast a notice over the Twitter bridge, and
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* do so if necessary. Will determine whether to do a straight post or
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* a repeat/retweet
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*
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* This function is meant to be called directly from TwitterQueueHandler.
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*
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* @param Notice $notice
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* @return boolean true if complete or successful, false if we should retry
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*/
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function broadcast_twitter($notice)
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{
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try {
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$flink = Foreign_link::getByUserID($notice->profile_id, TWITTER_SERVICE);
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} catch (NoResultException $e) {
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// Alright so don't broadcast it then! (since there's no foreign link)
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return true;
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}
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// Don't bother with basic auth, since it's no longer allowed
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if (TwitterOAuthClient::isPackedToken($flink->credentials)) {
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if (is_twitter_bound($notice, $flink)) {
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if (!empty($notice->repeat_of) && is_twitter_notice($notice->repeat_of)) {
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$retweet = retweet_notice($flink, Notice::getKV('id', $notice->repeat_of));
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if (is_object($retweet)) {
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Notice_to_status::saveNew($notice->id, twitter_id($retweet));
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return true;
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} else {
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// Our error processing will have decided if we need to requeue
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// this or can discard safely.
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return $retweet;
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}
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} else {
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return broadcast_oauth($notice, $flink);
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}
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}
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}
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return true;
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}
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/**
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* Send a retweet to Twitter for a notice that has been previously bridged
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* in or out.
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*
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* Warning: the return value is not guaranteed to be an object; some error
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* conditions will return a 'true' which should be passed on to a calling
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* queue handler.
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*
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* No local information about the resulting retweet is saved: it's up to
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* caller to save new mappings etc if appropriate.
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*
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* @param Foreign_link $flink
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* @param Notice $notice
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* @return mixed object with resulting Twitter status data on success, or true/false/null on error conditions.
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*/
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function retweet_notice($flink, $notice)
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{
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$token = TwitterOAuthClient::unpackToken($flink->credentials);
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$client = new TwitterOAuthClient($token->key, $token->secret);
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$id = twitter_status_id($notice);
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if (empty($id)) {
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common_log(LOG_WARNING, "Trying to retweet notice {$notice->id} with no known status id.");
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return null;
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}
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try {
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$status = $client->statusesRetweet($id);
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return $status;
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} catch (OAuthClientException $e) {
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return process_error($e, $flink, $notice);
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}
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}
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function twitter_status_id($notice)
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{
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$n2s = Notice_to_status::getKV('notice_id', $notice->id);
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if (empty($n2s)) {
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return null;
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} else {
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return $n2s->status_id;
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}
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}
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/**
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* Pull any extra information from a notice that we should transfer over
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* to Twitter beyond the notice text itself.
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*
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* @param Notice $notice
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* @return array of key-value pairs for Twitter update submission
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* @access private
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*/
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function twitter_update_params($notice)
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{
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$params = array();
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if ($notice->lat || $notice->lon) {
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$params['lat'] = $notice->lat;
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$params['long'] = $notice->lon;
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}
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if (!empty($notice->reply_to) && is_twitter_notice($notice->reply_to)) {
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$reply = Notice::getKV('id', $notice->reply_to);
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$params['in_reply_to_status_id'] = twitter_status_id($reply);
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}
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return $params;
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}
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function broadcast_oauth($notice, Foreign_link $flink) {
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try {
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$user = $flink->getUser();
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} catch (ServerException $e) {
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common_log(LOG_WARNING, 'Discarding broadcast_oauth for notice '.$notice->id.' because of exception: '.$e->getMessage());
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return true;
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}
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$statustxt = format_status($notice);
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$params = twitter_update_params($notice);
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$token = TwitterOAuthClient::unpackToken($flink->credentials);
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$client = new TwitterOAuthClient($token->key, $token->secret);
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$status = null;
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try {
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$status = $client->statusesUpdate($statustxt, $params);
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if (!empty($status)) {
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Notice_to_status::saveNew($notice->id, twitter_id($status));
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}
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} catch (OAuthClientException $e) {
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return process_error($e, $flink, $notice);
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}
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if (empty($status)) {
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// This could represent a failure posting,
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// or the Twitter API might just be behaving flakey.
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$errmsg = sprintf('Twitter bridge - No data returned by Twitter API when ' .
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'trying to post notice %d for User %s (user id %d).',
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$notice->id,
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$user->nickname,
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$user->id);
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common_log(LOG_WARNING, $errmsg);
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return false;
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}
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// Notice crossed the great divide
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$msg = sprintf('Twitter bridge - posted notice %d to Twitter using ' .
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'OAuth for User %s (user id %d).',
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$notice->id,
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$user->nickname,
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$user->id);
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common_log(LOG_INFO, $msg);
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return true;
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}
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function process_error($e, $flink, $notice)
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{
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$user = $flink->getUser();
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$code = $e->getCode();
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$logmsg = sprintf('Twitter bridge - %d posting notice %d for ' .
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'User %s (user id: %d): %s.',
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$code,
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$notice->id,
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$user->nickname,
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$user->id,
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$e->getMessage());
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common_log(LOG_WARNING, $logmsg);
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// http://dev.twitter.com/pages/responses_errors
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switch($code) {
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case 400:
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// Probably invalid data (bad Unicode chars or coords) that
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// cannot be resolved by just sending again.
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//
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// It could also be rate limiting, but retrying immediately
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// won't help much with that, so we'll discard for now.
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// If a facility for retrying things later comes up in future,
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// we can detect the rate-limiting headers and use that.
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//
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// Discard the message permanently.
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return true;
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break;
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case 401:
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// Probably a revoked or otherwise bad access token - nuke!
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remove_twitter_link($flink);
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return true;
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break;
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case 403:
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// User has exceeder her rate limit -- toss the notice
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return true;
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break;
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case 404:
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// Resource not found. Shouldn't happen much on posting,
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// but just in case!
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//
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// Consider it a matter for tossing the notice.
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return true;
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break;
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default:
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// For every other case, it's probably some flakiness so try
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// sending the notice again later (requeue).
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return false;
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break;
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}
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}
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function format_status($notice)
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{
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// Start with the plaintext source of this notice...
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$statustxt = $notice->content;
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// Convert !groups to #hashes
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// XXX: Make this an optional setting?
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$statustxt = preg_replace('/(^|\s)!([A-Za-z0-9]{1,64})/', "\\1#\\2", $statustxt);
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// detect links, each link uses 23 characters on twitter
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$numberOfLinks = preg_match_all('`((http|https|ftp)://[^\s<]+[^\s<\.)])`i', $statustxt);
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$statusWithoutLinks = preg_replace('`((http|https|ftp)://[^\s<]+[^\s<\.)])`i', '', $statustxt);
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$statusLength = mb_strlen($statusWithoutLinks) + $numberOfLinks * 23;
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// Twitter still has a 140-char hardcoded max.
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if ($statusLength > 140) {
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$noticeUrl = common_shorten_url($notice->getUrl());
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// each link uses 23 chars on twitter + 3 for the ' … ' => 26
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$statustxt = mb_substr($statustxt, 0, 140 - 26) . ' … ' . $noticeUrl;
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}
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return $statustxt;
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}
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function remove_twitter_link($flink)
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{
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$user = $flink->getUser();
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common_log(LOG_INFO, 'Removing Twitter bridge Foreign link for ' .
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"user $user->nickname (user id: $user->id).");
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$result = $flink->safeDelete();
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if (empty($result)) {
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common_log(LOG_ERR, 'Could not remove Twitter bridge ' .
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"Foreign_link for $user->nickname (user id: $user->id)!");
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common_log_db_error($flink, 'DELETE', __FILE__);
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}
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// Notify the user that her Twitter bridge is down
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if (isset($user->email)) {
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$result = mail_twitter_bridge_removed($user);
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if (!$result) {
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$msg = 'Unable to send email to notify ' .
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"$user->nickname (user id: $user->id) " .
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'that their Twitter bridge link was ' .
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'removed!';
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common_log(LOG_WARNING, $msg);
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}
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}
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}
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/**
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* Send a mail message to notify a user that her Twitter bridge link
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* has stopped working, and therefore has been removed. This can
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* happen when the user changes her Twitter password, or otherwise
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* revokes access.
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*
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* @param User $user user whose Twitter bridge link has been removed
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*
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* @return boolean success flag
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*/
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function mail_twitter_bridge_removed($user)
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{
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$profile = $user->getProfile();
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common_switch_locale($user->language);
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// TRANS: Mail subject after forwarding notices to Twitter has stopped working.
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$subject = sprintf(_m('Your Twitter bridge has been disabled'));
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$site_name = common_config('site', 'name');
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// TRANS: Mail body after forwarding notices to Twitter has stopped working.
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// TRANS: %1$ is the name of the user the mail is sent to, %2$s is a URL to the
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// TRANS: Twitter settings, %3$s is the StatusNet sitename.
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$body = sprintf(_m('Hi, %1$s. We\'re sorry to inform you that your ' .
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'link to Twitter has been disabled. We no longer seem to have ' .
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'permission to update your Twitter status. Did you maybe revoke ' .
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'%3$s\'s access?' . "\n\n" .
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'You can re-enable your Twitter bridge by visiting your ' .
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"Twitter settings page:\n\n\t%2\$s\n\n" .
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"Regards,\n%3\$s"),
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$profile->getBestName(),
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common_local_url('twittersettings'),
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common_config('site', 'name'));
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common_switch_locale();
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return mail_to_user($user, $subject, $body);
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}
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