forked from GNUsocial/gnu-social
275 lines
11 KiB
PHP
275 lines
11 KiB
PHP
<?php
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/*
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* StatusNet - the distributed open-source microblogging tool
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* Copyright (C) 2010, 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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/**
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* @package OStatusPlugin
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* @author James Walker <james@status.net>
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*/
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if (!defined('GNUSOCIAL')) { exit(1); }
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class SalmonAction extends Action
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{
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protected $needPost = true;
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protected $oprofile = null; // Ostatus_profile of the actor
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protected $actor = null; // Profile object of the actor
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var $xml = null;
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var $activity = null;
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var $target = null;
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protected function prepare(array $args=array())
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{
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StatusNet::setApi(true); // Send smaller error pages
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parent::prepare($args);
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if (!isset($_SERVER['CONTENT_TYPE']) || $_SERVER['CONTENT_TYPE'] != 'application/magic-envelope+xml') {
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// TRANS: Client error. Do not translate "application/magic-envelope+xml".
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$this->clientError(_m('Salmon requires "application/magic-envelope+xml".'));
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}
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try {
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$envxml = file_get_contents('php://input');
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$magic_env = new MagicEnvelope($envxml); // parse incoming XML as a MagicEnvelope
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$entry = $magic_env->getPayload(); // Not cryptographically verified yet!
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$this->activity = new Activity($entry->documentElement);
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if (empty($this->activity->actor->id)) {
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common_log(LOG_ERR, "broken actor: " . var_export($this->activity->actor->id, true));
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common_log(LOG_ERR, "activity with no actor: " . var_export($this->activity, true));
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// TRANS: Exception.
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throw new Exception(_m('Received a salmon slap from unidentified actor.'));
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}
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// ensureProfiles sets $this->actor and $this->oprofile
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$this->ensureProfiles();
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} catch (Exception $e) {
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common_debug('Salmon envelope parsing failed with: '.$e->getMessage());
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$this->clientError($e->getMessage());
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}
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// Cryptographic verification test
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if (!$magic_env->verify($this->actor)) {
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common_log(LOG_DEBUG, "Salmon signature verification failed.");
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// TRANS: Client error.
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$this->clientError(_m('Salmon signature verification failed.'));
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}
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return true;
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}
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/**
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* Check the posted activity type and break out to appropriate processing.
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*/
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protected function handle()
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{
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parent::handle();
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common_log(LOG_DEBUG, "Got a " . $this->activity->verb);
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try {
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if (Event::handle('StartHandleSalmonTarget', array($this->activity, $this->target)) &&
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Event::handle('StartHandleSalmon', array($this->activity))) {
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switch ($this->activity->verb) {
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case ActivityVerb::POST:
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$this->handlePost();
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break;
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case ActivityVerb::SHARE:
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$this->handleShare();
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break;
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case ActivityVerb::FOLLOW:
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case ActivityVerb::FRIEND:
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$this->handleFollow();
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break;
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case ActivityVerb::UNFOLLOW:
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$this->handleUnfollow();
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break;
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case ActivityVerb::JOIN:
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$this->handleJoin();
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break;
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case ActivityVerb::LEAVE:
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$this->handleLeave();
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break;
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case ActivityVerb::TAG:
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$this->handleTag();
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break;
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case ActivityVerb::UNTAG:
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$this->handleUntag();
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break;
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case ActivityVerb::UPDATE_PROFILE:
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$this->handleUpdateProfile();
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break;
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default:
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// TRANS: Client exception.
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throw new ClientException(_m('Unrecognized activity type.'));
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}
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Event::handle('EndHandleSalmon', array($this->activity));
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Event::handle('EndHandleSalmonTarget', array($this->activity, $this->target));
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}
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} catch (AlreadyFulfilledException $e) {
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// The action's results are already fulfilled. Maybe it was a
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// duplicate? Maybe someone's database is out of sync?
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// Let's just accept it and move on.
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common_log(LOG_INFO, 'Salmon slap carried an event which had already been fulfilled.');
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}
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}
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function handlePost()
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{
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// TRANS: Client exception.
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throw new ClientException(_m('This target does not understand posts.'));
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}
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function handleFollow()
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{
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// TRANS: Client exception.
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throw new ClientException(_m('This target does not understand follows.'));
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}
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function handleUnfollow()
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{
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// TRANS: Client exception.
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throw new ClientException(_m('This target does not understand unfollows.'));
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}
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function handleShare()
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{
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// TRANS: Client exception.
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throw new ClientException(_m('This target does not understand share events.'));
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}
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function handleJoin()
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{
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// TRANS: Client exception.
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throw new ClientException(_m('This target does not understand joins.'));
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}
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function handleLeave()
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{
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// TRANS: Client exception.
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throw new ClientException(_m('This target does not understand leave events.'));
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}
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function handleTag()
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{
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// TRANS: Client exception.
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throw new ClientException(_m('This target does not understand list events.'));
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}
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function handleUntag()
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{
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// TRANS: Client exception.
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throw new ClientException(_m('This target does not understand unlist events.'));
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}
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/**
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* Remote user sent us an update to their profile.
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* If we already know them, accept the updates.
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*/
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function handleUpdateProfile()
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{
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$oprofile = Ostatus_profile::getActorProfile($this->activity);
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if ($oprofile instanceof Ostatus_profile) {
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common_log(LOG_INFO, "Got a profile-update ping from $oprofile->uri");
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$oprofile->updateFromActivityObject($this->activity->actor);
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} else {
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common_log(LOG_INFO, "Ignoring profile-update ping from unknown " . $this->activity->actor->id);
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}
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}
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function ensureProfiles()
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{
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try {
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$this->oprofile = Ostatus_profile::getActorProfile($this->activity);
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if (!$this->oprofile instanceof Ostatus_profile) {
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throw new UnknownUriException($this->activity->actor->id);
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}
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} catch (UnknownUriException $e) {
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// Apparently we didn't find the Profile object based on our URI,
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// so OStatus doesn't have it with this URI in ostatus_profile.
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// Try to look it up again, remote side may have changed from http to https
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// or maybe publish an acct: URI now instead of an http: URL.
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//
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// Steps:
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// 1. Check the newly received URI. Who does it say it is?
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// 2. Compare these alleged identities to our local database.
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// 3. If we found any locally stored identities, ask it about its aliases.
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// 4. Do any of the aliases from our known identity match the recently introduced one?
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//
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// Example: We have stored http://example.com/user/1 but this URI says https://example.com/user/1
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common_debug('No local Profile object found for a magicsigned activity author URI: '.$e->object_uri);
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$disco = new Discovery();
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$xrd = $disco->lookup($e->object_uri);
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// Step 1: We got a bunch of discovery data for https://example.com/user/1 which includes
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// aliases https://example.com/user and hopefully our original http://example.com/user/1 too
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$all_ids = array_merge(array($xrd->subject), $xrd->aliases);
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if (!in_array($e->object_uri, $all_ids)) {
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common_debug('The activity author URI we got was not listed itself when doing discovery on it.');
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throw $e;
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}
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// Go through each reported alias from lookup to see if we know this already
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foreach ($all_ids as $aliased_uri) {
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$oprofile = Ostatus_profile::getKV('uri', $aliased_uri);
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if (!$oprofile instanceof Ostatus_profile) {
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continue; // unknown locally, check the next alias
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}
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// Step 2: We found the alleged http://example.com/user/1 URI in our local database,
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// but this can't be trusted yet because anyone can publish any alias.
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common_debug('Found a local Ostatus_profile for "'.$e->object_uri.'" with this URI: '.$aliased_uri);
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// We found an existing OStatus profile, but is it really the same? Do a callback to the URI's origin
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// Step 3: lookup our previously known http://example.com/user/1 webfinger etc.
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$xrd = $disco->lookup($oprofile->getUri()); // getUri returns ->uri, which we filtered on earlier
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$doublecheck_aliases = array_merge(array($xrd->subject), $xrd->aliases);
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common_debug('Trying to match known "'.$aliased_uri.'" against its returned aliases: '.implode(' ', $doublecheck_aliases));
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// if we find our original URI here, it is a legitimate alias
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// Step 4: Is the newly introduced https://example.com/user/1 URI in the list of aliases
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// presented by http://example.com/user/1 (i.e. do they both say they are the same identity?)
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if (in_array($e->object_uri, $doublecheck_aliases)) {
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common_debug('These identities both say they are each other: "'.$aliased_uri.'" and "'.$e->object_uri);
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$this->oprofile = $oprofile;
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break; // don't iterate through aliases anymore
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}
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}
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// We might end up here after $all_ids is iterated through without a $this->oprofile value,
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if (!$this->oprofile instanceof Ostatus_profile) {
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common_debug("We do not have a local profile to connect to this activity's author. Let's create one.");
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// ensureActivityObjectProfile throws exception on failure
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$this->oprofile = Ostatus_profile::ensureActivityObjectProfile($this->activity->actor);
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}
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}
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assert($this->oprofile instanceof Ostatus_profile);
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$this->actor = $this->oprofile->localProfile();
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}
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function saveNotice()
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{
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if (!$this->oprofile instanceof Ostatus_profile) {
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common_debug('Ostatus_profile missing in ' . get_class(). ' profile: '.var_export($this->profile));
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}
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return $this->oprofile->processPost($this->activity, 'salmon');
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}
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}
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