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[friendica.git] / mod / like.php
1 <?php
2
3 require_once('include/security.php');
4 require_once('include/bbcode.php');
5 require_once('include/items.php');
6
7
8 function like_content(&$a) {
9
10         if(! local_user() && ! remote_user()) {
11                 return;
12         }
13
14         $verb = notags(trim($_GET['verb']));
15
16         if(! $verb)
17                 $verb = 'like';
18
19
20         switch($verb) {
21                 case 'like':
22                 case 'unlike':
23                         $activity = ACTIVITY_LIKE;
24                         break;
25                 case 'dislike':
26                 case 'undislike':
27                         $activity = ACTIVITY_DISLIKE;
28                         break;
29                 default:
30                         return;
31                         break;
32         }
33
34
35         $item_id = (($a->argc > 1) ? notags(trim($a->argv[1])) : 0);
36
37         logger('like: verb ' . $verb . ' item ' . $item_id);
38
39
40         $r = q("SELECT * FROM `item` WHERE `id` = '%s' OR `uri` = '%s' LIMIT 1",
41                 dbesc($item_id),
42                 dbesc($item_id)
43         );
44
45         if(! $item_id || (! count($r))) {
46                 logger('like: no item ' . $item_id);
47                 return;
48         }
49
50         $item = $r[0];
51
52         $owner_uid = $item['uid'];
53
54         if(! can_write_wall($a,$owner_uid)) {
55                 return;
56         }
57
58         $remote_owner = null;
59
60         if(! $item['wall']) {
61                 // The top level post may have been written by somebody on another system
62                 $r = q("SELECT * FROM `contact` WHERE `id` = %d AND `uid` = %d LIMIT 1",
63                         intval($item['contact-id']),
64                         intval($item['uid'])
65                 );
66                 if(! count($r))
67                         return;
68                 if(! $r[0]['self'])
69                         $remote_owner = $r[0];
70         }
71
72         // this represents the post owner on this system. 
73
74         $r = q("SELECT `contact`.*, `user`.`nickname` FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
75                 WHERE `contact`.`self` = 1 AND `contact`.`uid` = %d LIMIT 1",
76                 intval($owner_uid)
77         );
78         if(count($r))
79                 $owner = $r[0];
80
81         if(! $owner) {
82                 logger('like: no owner');
83                 return;
84         }
85
86         if(! $remote_owner)
87                 $remote_owner = $owner;
88
89
90         // This represents the person posting
91
92         if((local_user()) && (local_user() == $owner_uid)) {
93                 $contact = $owner;
94         }
95         else {
96                 $r = q("SELECT * FROM `contact` WHERE `id` = %d AND `uid` = %d LIMIT 1",
97                         intval($_SESSION['visitor_id']),
98                         intval($owner_uid)
99                 );
100                 if(count($r))
101                         $contact = $r[0];
102         }
103         if(! $contact) {
104                 return;
105         }
106
107
108         $r = q("SELECT * FROM `item` WHERE `verb` = '%s' AND `deleted` = 0 
109                 AND `contact-id` = %d AND ( `parent` = '%s' OR `parent-uri` = '%s' OR `thr-parent` = '%s') LIMIT 1",
110                 dbesc($activity),
111                 intval($contact['id']),
112                 dbesc($item_id),
113                 dbesc($item_id),
114                 dbesc($item['uri'])
115         );
116         if(count($r)) {
117                 $like_item = $r[0];
118
119                 // Already voted, undo it
120                 $r = q("UPDATE `item` SET `deleted` = 1, `unseen` = 1, `changed` = '%s' WHERE `id` = %d LIMIT 1",
121                         dbesc(datetime_convert()),
122                         intval($like_item['id'])
123                 );
124
125
126                 // Clean up the Diaspora signatures for this like
127                 // Go ahead and do it even if Diaspora support is disabled. We still want to clean up
128                 // if it had been enabled in the past
129                 $r = q("DELETE FROM `sign` WHERE `iid` = %d",
130                         intval($like_item['id'])
131                 );
132
133                 // Save the author information for the unlike in case we need to relay to Diaspora
134                 store_diaspora_like_retract_sig($activity, $item, $like_item, $contact);
135
136
137 //              proc_run('php',"include/notifier.php","like","$post_id"); // $post_id isn't defined here!
138                 $like_item_id = $like_item['id'];
139                 proc_run('php',"include/notifier.php","like","$like_item_id");
140                 return;
141         }
142
143         $uri = item_new_uri($a->get_hostname(),$owner_uid);
144
145         $post_type = (($item['resource-id']) ? t('photo') : t('status'));
146         $objtype = (($item['resource-id']) ? ACTIVITY_OBJ_PHOTO : ACTIVITY_OBJ_NOTE ); 
147         $link = xmlify('<link rel="alternate" type="text/html" href="' . $a->get_baseurl() . '/display/' . $owner['nickname'] . '/' . $item['id'] . '" />' . "\n") ;
148         $body = $item['body'];
149
150         $obj = <<< EOT
151
152         <object>
153                 <type>$objtype</type>
154                 <local>1</local>
155                 <id>{$item['uri']}</id>
156                 <link>$link</link>
157                 <title></title>
158                 <content>$body</content>
159         </object>
160 EOT;
161         if($verb === 'like')
162                 $bodyverb = t('%1$s likes %2$s\'s %3$s');
163         if($verb === 'dislike')
164                 $bodyverb = t('%1$s doesn\'t like %2$s\'s %3$s');
165
166         if(! isset($bodyverb))
167                         return; 
168
169         $arr = array();
170
171         $arr['uri'] = $uri;
172         $arr['uid'] = $owner_uid;
173         $arr['contact-id'] = $contact['id'];
174         $arr['type'] = 'activity';
175         $arr['wall'] = $item['wall'];
176         $arr['origin'] = 1;
177         $arr['gravity'] = GRAVITY_LIKE;
178         $arr['parent'] = $item['id'];
179         $arr['parent-uri'] = $item['uri'];
180         $arr['thr-parent'] = $item['uri'];
181         $arr['owner-name'] = $remote_owner['name'];
182         $arr['owner-link'] = $remote_owner['url'];
183         $arr['owner-avatar'] = $remote_owner['thumb'];
184         $arr['author-name'] = $contact['name'];
185         $arr['author-link'] = $contact['url'];
186         $arr['author-avatar'] = $contact['thumb'];
187         
188         $ulink = '[url=' . $contact['url'] . ']' . $contact['name'] . '[/url]';
189         $alink = '[url=' . $item['author-link'] . ']' . $item['author-name'] . '[/url]';
190         $plink = '[url=' . $a->get_baseurl() . '/display/' . $owner['nickname'] . '/' . $item['id'] . ']' . $post_type . '[/url]';
191         $arr['body'] =  sprintf( $bodyverb, $ulink, $alink, $plink );
192
193         $arr['verb'] = $activity;
194         $arr['object-type'] = $objtype;
195         $arr['object'] = $obj;
196         $arr['allow_cid'] = $item['allow_cid'];
197         $arr['allow_gid'] = $item['allow_gid'];
198         $arr['deny_cid'] = $item['deny_cid'];
199         $arr['deny_gid'] = $item['deny_gid'];
200         $arr['visible'] = 1;
201         $arr['unseen'] = 1;
202         $arr['last-child'] = 0;
203
204         $post_id = item_store($arr);    
205
206         if(! $item['visible']) {
207                 $r = q("UPDATE `item` SET `visible` = 1 WHERE `id` = %d AND `uid` = %d LIMIT 1",
208                         intval($item['id']),
209                         intval($owner_uid)
210                 );
211         }                       
212
213
214         // Save the author information for the like in case we need to relay to Diaspora
215         store_diaspora_like_sig($activity, $post_type, $contact, $post_id);
216
217
218         $arr['id'] = $post_id;
219
220         call_hooks('post_local_end', $arr);
221
222         proc_run('php',"include/notifier.php","like","$post_id");
223
224         killme();
225 //      return; // NOTREACHED
226 }
227
228
229 function store_diaspora_like_retract_sig($activity, $item, $like_item, $contact) {
230         // Note that we can only create a signature for a user of the local server. We don't have
231         // a key for remote users. That is ok, because if a remote user is "unlike"ing a post, it 
232         // means we are the relay, and for relayable_retractions, Diaspora
233         // only checks the parent_author_signature if it doesn't have to relay further
234         //
235         // If $item['resource-id'] exists, it means the item is a photo. Diaspora doesn't support
236         // likes on photos, so don't bother.
237
238         $enabled = intval(get_config('system','diaspora_enabled'));
239         if(! $enabled) {
240                 logger('mod_like: diaspora support disabled, not storing like retraction signature', LOGGER_DEBUG);
241                 return;
242         }
243
244         logger('mod_like: storing diaspora like retraction signature');
245
246         if(($activity === ACTIVITY_LIKE) && (! $item['resource-id'])) {
247                 $signed_text = $like_item['guid'] . ';' . 'Like';
248
249                 // Only works for NETWORK_DFRN
250                 $contact_baseurl_start = strpos($contact['url'],'://') + 3;
251                 $contact_baseurl_length = strpos($contact['url'],'/profile') - $contact_baseurl_start;
252                 $contact_baseurl = substr($contact['url'], $contact_baseurl_start, $contact_baseurl_length);
253                 $diaspora_handle = $contact['nick'] . '@' . $contact_baseurl;
254
255                 // Get contact's private key if he's a user of the local Friendica server
256                 $r = q("SELECT `contact`.`uid` FROM `contact` WHERE `url` = '%s' AND `self` = 1 LIMIT 1",
257                         dbesc($contact['url'])
258                 );
259
260                 if( $r) {
261                         $contact_uid = $r['uid'];
262                         $r = q("SELECT prvkey FROM user WHERE uid = %d LIMIT 1",
263                                 intval($contact_uid)
264                         );
265
266                         if( $r)
267                                 $authorsig = base64_encode(rsa_sign($signed_text,$r['prvkey'],'sha256'));
268                 }
269
270                 if(! isset($authorsig))
271                         $authorsig = '';
272
273                 q("insert into sign (`retract_iid`,`signed_text`,`signature`,`signer`) values (%d,'%s','%s','%s') ",
274                         intval($like_item['id']),
275                         dbesc($signed_text),
276                         dbesc($authorsig),
277                         dbesc($diaspora_handle)
278                 );
279         }
280
281         return;
282 }
283
284 function store_diaspora_like_sig($activity, $post_type, $contact, $post_id) {
285         // Note that we can only create a signature for a user of the local server. We don't have
286         // a key for remote users. That is ok, because if a remote user is "unlike"ing a post, it 
287         // means we are the relay, and for relayable_retractions, Diaspora
288         // only checks the parent_author_signature if it doesn't have to relay further
289
290         $enabled = intval(get_config('system','diaspora_enabled'));
291         if(! $enabled) {
292                 logger('mod_like: diaspora support disabled, not storing like signature', LOGGER_DEBUG);
293                 return;
294         }
295
296         logger('mod_like: storing diaspora like signature');
297
298         if(($activity === ACTIVITY_LIKE) && ($post_type === t('status'))) {
299                 // Only works for NETWORK_DFRN
300                 $contact_baseurl_start = strpos($contact['url'],'://') + 3;
301                 $contact_baseurl_length = strpos($contact['url'],'/profile') - $contact_baseurl_start;
302                 $contact_baseurl = substr($contact['url'], $contact_baseurl_start, $contact_baseurl_length);
303                 $diaspora_handle = $contact['nick'] . '@' . $contact_baseurl;
304
305                 // Get contact's private key if he's a user of the local Friendica server
306                 $r = q("SELECT `contact`.`uid` FROM `contact` WHERE `url` = '%s' AND `self` = 1 LIMIT 1",
307                         dbesc($contact['url'])
308                 );
309
310                 if( $r) {
311                         $contact_uid = $r['uid'];
312                         $r = q("SELECT prvkey FROM user WHERE uid = %d LIMIT 1",
313                                 intval($contact_uid)
314                         );
315
316                         if( $r)
317                                 $contact_uprvkey = $r['prvkey'];
318                 }
319
320                 $r = q("SELECT guid, parent FROM `item` WHERE id = %d LIMIT 1",
321                         intval($post_id)
322                 );
323                 if( $r) {
324                         $p = q("SELECT guid FROM `item` WHERE id = %d AND parent = %d LIMIT 1",
325                                 intval($r[0]['parent']),
326                                 intval($r[0]['parent'])
327                         );
328                         if( $p) {
329                                 $signed_text = $r[0]['guid'] . ';Post;' . $p[0]['guid'] . ';true;' . $diaspora_handle;
330
331                                 if(isset($contact_uprvkey))
332                                         $authorsig = base64_encode(rsa_sign($signed_text,$contact_uprvkey,'sha256'));
333                                 else
334                                         $authorsig = '';
335
336                                 q("insert into sign (`iid`,`signed_text`,`signature`,`signer`) values (%d,'%s','%s','%s') ",
337                                         intval($post_id),
338                                         dbesc($signed_text),
339                                         dbesc($authorsig),
340                                         dbesc($diaspora_handle)
341                                 );
342                         }
343                 }
344         }
345
346         return;
347 }