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[quix0rs-gnu-social.git] / plugins / OStatus / lib / salmonaction.php
1 <?php
2 /*
3  * StatusNet - the distributed open-source microblogging tool
4  * Copyright (C) 2010, StatusNet, Inc.
5  *
6  * This program is free software: you can redistribute it and/or modify
7  * it under the terms of the GNU Affero General Public License as published by
8  * the Free Software Foundation, either version 3 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU Affero General Public License for more details.
15  *
16  * You should have received a copy of the GNU Affero General Public License
17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
18  */
19
20 /**
21  * @package OStatusPlugin
22  * @author James Walker <james@status.net>
23  */
24
25 if (!defined('GNUSOCIAL')) { exit(1); }
26
27 class SalmonAction extends Action
28 {
29     protected $needPost = true;
30
31     protected $oprofile = null; // Ostatus_profile of the actor
32     protected $actor    = null; // Profile object of the actor
33
34     var $xml      = null;
35     var $activity = null;
36     var $target   = null;
37
38     protected function prepare(array $args=array())
39     {
40         GNUsocial::setApi(true); // Send smaller error pages
41
42         parent::prepare($args);
43
44         if (!isset($_SERVER['CONTENT_TYPE'])) {
45             // TRANS: Client error. Do not translate "Content-type"
46             $this->clientError(_m('Salmon requires a Content-type header.'));
47         }
48         $envxml = null;
49         switch ($_SERVER['CONTENT_TYPE']) {
50         case 'application/magic-envelope+xml':
51             $envxml = file_get_contents('php://input');
52             break;
53         case 'application/x-www-form-urlencoded':
54             $envxml = Magicsig::base64_url_decode($this->trimmed('xml'));
55             break;
56         default:
57             // TRANS: Client error. Do not translate the quoted "application/[type]" strings.
58             throw new ClientException(_m('Salmon requires "application/magic-envelope+xml". For Diaspora we also accept "application/x-www-form-urlencoded" with an "xml" parameter.', 415));
59         }
60
61         if (empty($envxml)) {
62             throw new ClientException('No magic envelope supplied in POST.');
63         }
64         try {
65             $magic_env = new MagicEnvelope($envxml);   // parse incoming XML as a MagicEnvelope
66
67             $entry = $magic_env->getPayload();  // Not cryptographically verified yet!
68             $this->activity = new Activity($entry->documentElement);
69             if (empty($this->activity->actor->id)) {
70                 common_log(LOG_ERR, "broken actor: " . var_export($this->activity->actor->id, true));
71                 common_log(LOG_ERR, "activity with no actor: " . var_export($this->activity, true));
72                 // TRANS: Exception.
73                 throw new ClientException(_m('Activity in salmon slap has no actor id.'));
74             }
75             // ensureProfiles sets $this->actor and $this->oprofile
76             $this->ensureProfiles();
77         } catch (Exception $e) {
78             common_debug('Salmon envelope parsing failed with: '.$e->getMessage());
79             // convert exception to ClientException
80             throw new ClientException($e->getMessage());
81         }
82
83         // Cryptographic verification test, throws exception on failure
84         $magic_env->verify($this->actor);
85
86         return true;
87     }
88
89     /**
90      * Check the posted activity type and break out to appropriate processing.
91      */
92
93     protected function handle()
94     {
95         parent::handle();
96
97         assert($this->activity instanceof Activity);
98         assert($this->target instanceof Profile);
99
100         common_log(LOG_DEBUG, "Got a " . $this->activity->verb);
101         try {
102             $options = [ 'source' => 'ostatus' ];
103             common_debug('Save salmon slap directly with Notice::saveActivity for actor=='.$this->actor->getID());
104             $stored = Notice::saveActivity($this->activity, $this->actor, $options);
105             common_debug('Save salmon slap finished, notice id=='.$stored->getID());
106             return true;
107         } catch (AlreadyFulfilledException $e) {
108             // The action's results are already fulfilled. Maybe it was a
109             // duplicate? Maybe someone's database is out of sync?
110             // Let's just accept it and move on.
111             common_log(LOG_INFO, 'Salmon slap carried an event which had already been fulfilled.');
112             return true;
113         } catch (NoticeSaveException $e) {
114             common_debug('Notice::saveActivity did not save our '._ve($this->activity->verb).' activity, trying old-fashioned salmon saving.');
115         }
116
117         try {
118             if (Event::handle('StartHandleSalmonTarget', array($this->activity, $this->target)) &&
119                     Event::handle('StartHandleSalmon', array($this->activity))) {
120                 switch ($this->activity->verb) {
121                 case ActivityVerb::POST:
122                     $this->handlePost();
123                     break;
124                 case ActivityVerb::SHARE:
125                     $this->handleShare();
126                     break;
127                 case ActivityVerb::FOLLOW:
128                 case ActivityVerb::FRIEND:
129                     $this->handleFollow();
130                     break;
131                 case ActivityVerb::UNFOLLOW:
132                     $this->handleUnfollow();
133                     break;
134                 case ActivityVerb::JOIN:
135                     $this->handleJoin();
136                     break;
137                 case ActivityVerb::LEAVE:
138                     $this->handleLeave();
139                     break;
140                 case ActivityVerb::TAG:
141                     $this->handleTag();
142                     break;
143                 case ActivityVerb::UNTAG:
144                     $this->handleUntag();
145                     break;
146                 case ActivityVerb::UPDATE_PROFILE:
147                     $this->handleUpdateProfile();
148                     break;
149                 default:
150                     // TRANS: Client exception.
151                     throw new ClientException(_m('Unrecognized activity type.'));
152                 }
153                 Event::handle('EndHandleSalmon', array($this->activity));
154                 Event::handle('EndHandleSalmonTarget', array($this->activity, $this->target));
155             }
156         } catch (AlreadyFulfilledException $e) {
157             // The action's results are already fulfilled. Maybe it was a
158             // duplicate? Maybe someone's database is out of sync?
159             // Let's just accept it and move on.
160             common_log(LOG_INFO, 'Salmon slap carried an event which had already been fulfilled.');
161         }
162     }
163
164     function handlePost()
165     {
166         // TRANS: Client exception.
167         throw new ClientException(_m('This target does not understand posts.'));
168     }
169
170     function handleFollow()
171     {
172         // TRANS: Client exception.
173         throw new ClientException(_m('This target does not understand follows.'));
174     }
175
176     function handleUnfollow()
177     {
178         // TRANS: Client exception.
179         throw new ClientException(_m('This target does not understand unfollows.'));
180     }
181
182     function handleShare()
183     {
184         // TRANS: Client exception.
185         throw new ClientException(_m('This target does not understand share events.'));
186     }
187
188     function handleJoin()
189     {
190         // TRANS: Client exception.
191         throw new ClientException(_m('This target does not understand joins.'));
192     }
193
194     function handleLeave()
195     {
196         // TRANS: Client exception.
197         throw new ClientException(_m('This target does not understand leave events.'));
198     }
199
200     function handleTag()
201     {
202         // TRANS: Client exception.
203         throw new ClientException(_m('This target does not understand list events.'));
204     }
205
206     function handleUntag()
207     {
208         // TRANS: Client exception.
209         throw new ClientException(_m('This target does not understand unlist events.'));
210     }
211
212     /**
213      * Remote user sent us an update to their profile.
214      * If we already know them, accept the updates.
215      */
216     function handleUpdateProfile()
217     {
218         $oprofile = Ostatus_profile::getActorProfile($this->activity);
219         if ($oprofile instanceof Ostatus_profile) {
220             common_log(LOG_INFO, "Got a profile-update ping from $oprofile->uri");
221             $oprofile->updateFromActivityObject($this->activity->actor);
222         } else {
223             common_log(LOG_INFO, "Ignoring profile-update ping from unknown " . $this->activity->actor->id);
224         }
225     }
226
227     function ensureProfiles()
228     {
229         try {
230             $this->oprofile = Ostatus_profile::getActorProfile($this->activity);
231             if (!$this->oprofile instanceof Ostatus_profile) {
232                 throw new UnknownUriException($this->activity->actor->id);
233             }
234         } catch (UnknownUriException $e) {
235             // Apparently we didn't find the Profile object based on our URI,
236             // so OStatus doesn't have it with this URI in ostatus_profile.
237             // Try to look it up again, remote side may have changed from http to https
238             // or maybe publish an acct: URI now instead of an http: URL.
239             //
240             // Steps:
241             // 1. Check the newly received URI. Who does it say it is?
242             // 2. Compare these alleged identities to our local database.
243             // 3. If we found any locally stored identities, ask it about its aliases.
244             // 4. Do any of the aliases from our known identity match the recently introduced one?
245             //
246             // Example: We have stored http://example.com/user/1 but this URI says https://example.com/user/1
247             common_debug('No local Profile object found for a magicsigned activity author URI: '.$e->object_uri);
248             $disco = new Discovery();
249             $xrd = $disco->lookup($e->object_uri);
250             // Step 1: We got a bunch of discovery data for https://example.com/user/1 which includes
251             //         aliases https://example.com/user and hopefully our original http://example.com/user/1 too
252             $all_ids = array_merge(array($xrd->subject), $xrd->aliases);
253
254             if (!in_array($e->object_uri, $all_ids)) {
255                 common_debug('The activity author URI we got was not listed itself when doing discovery on it.');
256                 throw $e;
257             }
258
259             // Go through each reported alias from lookup to see if we know this already
260             foreach ($all_ids as $aliased_uri) {
261                 $oprofile = Ostatus_profile::getKV('uri', $aliased_uri);
262                 if (!$oprofile instanceof Ostatus_profile) {
263                     continue;   // unknown locally, check the next alias
264                 }
265                 // Step 2: We found the alleged http://example.com/user/1 URI in our local database,
266                 //         but this can't be trusted yet because anyone can publish any alias.
267                 common_debug('Found a local Ostatus_profile for "'.$e->object_uri.'" with this URI: '.$aliased_uri);
268
269                 // We found an existing OStatus profile, but is it really the same? Do a callback to the URI's origin
270                 // Step 3: lookup our previously known http://example.com/user/1 webfinger etc.
271                 $xrd = $disco->lookup($oprofile->getUri()); // getUri returns ->uri, which we filtered on earlier
272                 $doublecheck_aliases = array_merge(array($xrd->subject), $xrd->aliases);
273                 common_debug('Trying to match known "'.$aliased_uri.'" against its returned aliases: '.implode(' ', $doublecheck_aliases));
274                 // if we find our original URI here, it is a legitimate alias
275                 // Step 4: Is the newly introduced https://example.com/user/1 URI in the list of aliases
276                 //         presented by http://example.com/user/1 (i.e. do they both say they are the same identity?)
277                 if (in_array($e->object_uri, $doublecheck_aliases)) {
278                     $oprofile->updateUriKeys($e->object_uri, DiscoveryHints::fromXRD($xrd));
279                     $this->oprofile = $oprofile;
280                     break;  // don't iterate through aliases anymore
281                 }
282             }
283
284             // We might end up here after $all_ids is iterated through without a $this->oprofile value,
285             if (!$this->oprofile instanceof Ostatus_profile) {
286                 common_debug("We do not have a local profile to connect to this activity's author. Let's create one.");
287                 // ensureActivityObjectProfile throws exception on failure
288                 $this->oprofile = Ostatus_profile::ensureActivityObjectProfile($this->activity->actor);
289             }
290         }
291
292         assert($this->oprofile instanceof Ostatus_profile);
293
294         $this->actor = $this->oprofile->localProfile();
295     }
296
297     function saveNotice()
298     {
299         if (!$this->oprofile instanceof Ostatus_profile) {
300             common_debug('Ostatus_profile missing in ' . get_class(). ' profile: '.var_export($this->profile, true));
301         }
302         return $this->oprofile->processPost($this->activity, 'salmon');
303     }
304 }