gnu-social/plugins/OStatus/lib/salmonaction.php

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