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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
102         try {
103             $options = [ 'source' => 'ostatus' ];
104             common_debug('Save salmon slap directly with Notice::saveActivity for actor=='.$this->actor->getID());
105             $stored = Notice::saveActivity($this->activity, $this->actor, $options);
106             common_debug('Save salmon slap finished, notice id=='.$stored->getID());
107             return true;
108         } catch (AlreadyFulfilledException $e) {
109             // The action's results are already fulfilled. Maybe it was a
110             // duplicate? Maybe someone's database is out of sync?
111             // Let's just accept it and move on.
112             common_log(LOG_INFO, 'Salmon slap carried an event which had already been fulfilled.');
113             return true;
114         } catch (NoticeSaveException $e) {
115             common_debug('Notice::saveActivity did not save our '._ve($this->activity->verb).' activity, trying old-fashioned salmon saving.');
116         }
117
118         try {
119             if (Event::handle('StartHandleSalmonTarget', array($this->activity, $this->target)) &&
120                     Event::handle('StartHandleSalmon', array($this->activity))) {
121                 switch ($this->activity->verb) {
122                 case ActivityVerb::POST:
123                     $this->handlePost();
124                     break;
125                 case ActivityVerb::SHARE:
126                     $this->handleShare();
127                     break;
128                 case ActivityVerb::FOLLOW:
129                 case ActivityVerb::FRIEND:
130                     $this->handleFollow();
131                     break;
132                 case ActivityVerb::UNFOLLOW:
133                     $this->handleUnfollow();
134                     break;
135                 case ActivityVerb::JOIN:
136                     $this->handleJoin();
137                     break;
138                 case ActivityVerb::LEAVE:
139                     $this->handleLeave();
140                     break;
141                 case ActivityVerb::TAG:
142                     $this->handleTag();
143                     break;
144                 case ActivityVerb::UNTAG:
145                     $this->handleUntag();
146                     break;
147                 case ActivityVerb::UPDATE_PROFILE:
148                     $this->handleUpdateProfile();
149                     break;
150                 default:
151                     // TRANS: Client exception.
152                     throw new ClientException(_m('Unrecognized activity type.'));
153                 }
154                 Event::handle('EndHandleSalmon', array($this->activity));
155                 Event::handle('EndHandleSalmonTarget', array($this->activity, $this->target));
156             }
157         } catch (AlreadyFulfilledException $e) {
158             // The action's results are already fulfilled. Maybe it was a
159             // duplicate? Maybe someone's database is out of sync?
160             // Let's just accept it and move on.
161             common_log(LOG_INFO, 'Salmon slap carried an event which had already been fulfilled.');
162         }
163     }
164
165     function handlePost()
166     {
167         // TRANS: Client exception.
168         throw new ClientException(_m('This target does not understand posts.'));
169     }
170
171     function handleFollow()
172     {
173         // TRANS: Client exception.
174         throw new ClientException(_m('This target does not understand follows.'));
175     }
176
177     function handleUnfollow()
178     {
179         // TRANS: Client exception.
180         throw new ClientException(_m('This target does not understand unfollows.'));
181     }
182
183     function handleShare()
184     {
185         // TRANS: Client exception.
186         throw new ClientException(_m('This target does not understand share events.'));
187     }
188
189     function handleJoin()
190     {
191         // TRANS: Client exception.
192         throw new ClientException(_m('This target does not understand joins.'));
193     }
194
195     function handleLeave()
196     {
197         // TRANS: Client exception.
198         throw new ClientException(_m('This target does not understand leave events.'));
199     }
200
201     function handleTag()
202     {
203         // TRANS: Client exception.
204         throw new ClientException(_m('This target does not understand list events.'));
205     }
206
207     function handleUntag()
208     {
209         // TRANS: Client exception.
210         throw new ClientException(_m('This target does not understand unlist events.'));
211     }
212
213     /**
214      * Remote user sent us an update to their profile.
215      * If we already know them, accept the updates.
216      */
217     function handleUpdateProfile()
218     {
219         $oprofile = Ostatus_profile::getActorProfile($this->activity);
220         if ($oprofile instanceof Ostatus_profile) {
221             common_log(LOG_INFO, "Got a profile-update ping from $oprofile->uri");
222             $oprofile->updateFromActivityObject($this->activity->actor);
223         } else {
224             common_log(LOG_INFO, "Ignoring profile-update ping from unknown " . $this->activity->actor->id);
225         }
226     }
227
228     function ensureProfiles()
229     {
230         try {
231             $this->oprofile = Ostatus_profile::getActorProfile($this->activity);
232             if (!$this->oprofile instanceof Ostatus_profile) {
233                 throw new UnknownUriException($this->activity->actor->id);
234             }
235         } catch (UnknownUriException $e) {
236             // Apparently we didn't find the Profile object based on our URI,
237             // so OStatus doesn't have it with this URI in ostatus_profile.
238             // Try to look it up again, remote side may have changed from http to https
239             // or maybe publish an acct: URI now instead of an http: URL.
240             //
241             // Steps:
242             // 1. Check the newly received URI. Who does it say it is?
243             // 2. Compare these alleged identities to our local database.
244             // 3. If we found any locally stored identities, ask it about its aliases.
245             // 4. Do any of the aliases from our known identity match the recently introduced one?
246             //
247             // Example: We have stored http://example.com/user/1 but this URI says https://example.com/user/1
248             common_debug('No local Profile object found for a magicsigned activity author URI: '.$e->object_uri);
249             $disco = new Discovery();
250             $xrd = $disco->lookup($e->object_uri);
251             // Step 1: We got a bunch of discovery data for https://example.com/user/1 which includes
252             //         aliases https://example.com/user and hopefully our original http://example.com/user/1 too
253             $all_ids = array_merge(array($xrd->subject), $xrd->aliases);
254
255             if (!in_array($e->object_uri, $all_ids)) {
256                 common_debug('The activity author URI we got was not listed itself when doing discovery on it.');
257                 throw $e;
258             }
259
260             // Go through each reported alias from lookup to see if we know this already
261             foreach ($all_ids as $aliased_uri) {
262                 $oprofile = Ostatus_profile::getKV('uri', $aliased_uri);
263                 if (!$oprofile instanceof Ostatus_profile) {
264                     continue;   // unknown locally, check the next alias
265                 }
266                 // Step 2: We found the alleged http://example.com/user/1 URI in our local database,
267                 //         but this can't be trusted yet because anyone can publish any alias.
268                 common_debug('Found a local Ostatus_profile for "'.$e->object_uri.'" with this URI: '.$aliased_uri);
269
270                 // We found an existing OStatus profile, but is it really the same? Do a callback to the URI's origin
271                 // Step 3: lookup our previously known http://example.com/user/1 webfinger etc.
272                 $xrd = $disco->lookup($oprofile->getUri()); // getUri returns ->uri, which we filtered on earlier
273                 $doublecheck_aliases = array_merge(array($xrd->subject), $xrd->aliases);
274                 common_debug('Trying to match known "'.$aliased_uri.'" against its returned aliases: '.implode(' ', $doublecheck_aliases));
275                 // if we find our original URI here, it is a legitimate alias
276                 // Step 4: Is the newly introduced https://example.com/user/1 URI in the list of aliases
277                 //         presented by http://example.com/user/1 (i.e. do they both say they are the same identity?)
278                 if (in_array($e->object_uri, $doublecheck_aliases)) {
279                     $oprofile->updateUriKeys($e->object_uri, DiscoveryHints::fromXRD($xrd));
280                     $this->oprofile = $oprofile;
281                     break;  // don't iterate through aliases anymore
282                 }
283             }
284
285             // We might end up here after $all_ids is iterated through without a $this->oprofile value,
286             if (!$this->oprofile instanceof Ostatus_profile) {
287                 common_debug("We do not have a local profile to connect to this activity's author. Let's create one.");
288                 // ensureActivityObjectProfile throws exception on failure
289                 $this->oprofile = Ostatus_profile::ensureActivityObjectProfile($this->activity->actor);
290             }
291         }
292
293         assert($this->oprofile instanceof Ostatus_profile);
294
295         $this->actor = $this->oprofile->localProfile();
296     }
297
298     function saveNotice()
299     {
300         if (!$this->oprofile instanceof Ostatus_profile) {
301             common_debug('Ostatus_profile missing in ' . get_class(). ' profile: '.var_export($this->profile, true));
302         }
303         return $this->oprofile->processPost($this->activity, 'salmon');
304     }
305 }