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More modern coding, stuff related to subscriptions
[quix0rs-gnu-social.git] / classes / Subscription.php
1 <?php
2 /*
3  * StatusNet - the distributed open-source microblogging tool
4  * Copyright (C) 2008, 2009, 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 if (!defined('GNUSOCIAL')) { exit(1); }
21
22 /**
23  * Table Definition for subscription
24  */
25 class Subscription extends Managed_DataObject
26 {
27     const CACHE_WINDOW = 201;
28     const FORCE = true;
29
30     public $__table = 'subscription';                    // table name
31     public $subscriber;                      // int(4)  primary_key not_null
32     public $subscribed;                      // int(4)  primary_key not_null
33     public $jabber;                          // tinyint(1)   default_1
34     public $sms;                             // tinyint(1)   default_1
35     public $token;                           // varchar(255)
36     public $secret;                          // varchar(255)
37     public $uri;                             // varchar(255)
38     public $created;                         // datetime()   not_null
39     public $modified;                        // timestamp()   not_null default_CURRENT_TIMESTAMP
40
41     public static function schemaDef()
42     {
43         return array(
44             'fields' => array(
45                 'subscriber' => array('type' => 'int', 'not null' => true, 'description' => 'profile listening'),
46                 'subscribed' => array('type' => 'int', 'not null' => true, 'description' => 'profile being listened to'),
47                 'jabber' => array('type' => 'int', 'size' => 'tiny', 'default' => 1, 'description' => 'deliver jabber messages'),
48                 'sms' => array('type' => 'int', 'size' => 'tiny', 'default' => 1, 'description' => 'deliver sms messages'),
49                 'token' => array('type' => 'varchar', 'length' => 255, 'description' => 'authorization token'),
50                 'secret' => array('type' => 'varchar', 'length' => 255, 'description' => 'token secret'),
51                 'uri' => array('type' => 'varchar', 'length' => 255, 'description' => 'universally unique identifier'),
52                 'created' => array('type' => 'datetime', 'not null' => true, 'description' => 'date this record was created'),
53                 'modified' => array('type' => 'timestamp', 'not null' => true, 'description' => 'date this record was modified'),
54             ),
55             'primary key' => array('subscriber', 'subscribed'),
56             'unique keys' => array(
57                 'subscription_uri_key' => array('uri'),
58             ),
59             'indexes' => array(
60                 'subscription_subscriber_idx' => array('subscriber', 'created'),
61                 'subscription_subscribed_idx' => array('subscribed', 'created'),
62                 'subscription_token_idx' => array('token'),
63             ),
64         );
65     }
66
67     /**
68      * Make a new subscription
69      *
70      * @param Profile $subscriber party to receive new notices
71      * @param Profile $other      party sending notices; publisher
72      * @param bool    $force      pass Subscription::FORCE to override local subscription approval
73      *
74      * @return mixed Subscription or Subscription_queue: new subscription info
75      */
76
77     static function start(Profile $subscriber, Profile $other, $force=false)
78     {
79         if (!$subscriber->hasRight(Right::SUBSCRIBE)) {
80             // TRANS: Exception thrown when trying to subscribe while being banned from subscribing.
81             throw new Exception(_('You have been banned from subscribing.'));
82         }
83
84         if (self::exists($subscriber, $other)) {
85             // TRANS: Exception thrown when trying to subscribe while already subscribed.
86             throw new AlreadyFulfilledException(_('Already subscribed!'));
87         }
88
89         if ($other->hasBlocked($subscriber)) {
90             // TRANS: Exception thrown when trying to subscribe to a user who has blocked the subscribing user.
91             throw new Exception(_('User has blocked you.'));
92         }
93
94         if (Event::handle('StartSubscribe', array($subscriber, $other))) {
95             $otherUser = User::getKV('id', $other->id);
96             if ($otherUser instanceof User && $otherUser->subscribe_policy == User::SUBSCRIBE_POLICY_MODERATE && !$force) {
97                 $sub = Subscription_queue::saveNew($subscriber, $other);
98                 $sub->notify();
99             } else {
100                 $sub = self::saveNew($subscriber->id, $other->id);
101                 $sub->notify();
102
103                 self::blow('user:notices_with_friends:%d', $subscriber->id);
104
105                 self::blow('subscription:by-subscriber:'.$subscriber->id);
106                 self::blow('subscription:by-subscribed:'.$other->id);
107
108                 $subscriber->blowSubscriptionCount();
109                 $other->blowSubscriberCount();
110
111                 if ($otherUser instanceof User &&
112                     $otherUser->autosubscribe &&
113                     !self::exists($other, $subscriber) &&
114                     !$subscriber->hasBlocked($other)) {
115
116                     try {
117                         self::start($other, $subscriber);
118                     } catch (AlreadyFulfilledException $e) {
119                         // This shouldn't happen due to !self::exists above
120                         common_debug('Tried to autosubscribe a user to its new subscriber.');
121                     } catch (Exception $e) {
122                         common_log(LOG_ERR, "Exception during autosubscribe of {$other->nickname} to profile {$subscriber->id}: {$e->getMessage()}");
123                     }
124                 }
125             }
126
127             Event::handle('EndSubscribe', array($subscriber, $other));
128         }
129
130         return $sub;
131     }
132
133     /**
134      * Low-level subscription save.
135      * Outside callers should use Subscription::start()
136      */
137     protected function saveNew($subscriber_id, $other_id)
138     {
139         $sub = new Subscription();
140
141         $sub->subscriber = $subscriber_id;
142         $sub->subscribed = $other_id;
143         $sub->jabber     = 1;
144         $sub->sms        = 1;
145         $sub->created    = common_sql_now();
146         $sub->uri        = self::newURI($sub->subscriber,
147                                         $sub->subscribed,
148                                         $sub->created);
149
150         $result = $sub->insert();
151
152         if ($result===false) {
153             common_log_db_error($sub, 'INSERT', __FILE__);
154             // TRANS: Exception thrown when a subscription could not be stored on the server.
155             throw new Exception(_('Could not save subscription.'));
156         }
157
158         return $sub;
159     }
160
161     function notify()
162     {
163         // XXX: add other notifications (Jabber, SMS) here
164         // XXX: queue this and handle it offline
165         // XXX: Whatever happens, do it in Twitter-like API, too
166
167         $this->notifyEmail();
168     }
169
170     function notifyEmail()
171     {
172         $subscribedUser = User::getKV('id', $this->subscribed);
173
174         if ($subscribedUser instanceof User) {
175
176             $subscriber = Profile::getKV('id', $this->subscriber);
177
178             mail_subscribe_notify_profile($subscribedUser, $subscriber);
179         }
180     }
181
182     /**
183      * Cancel a subscription
184      *
185      */
186     static function cancel(Profile $subscriber, Profile $other)
187     {
188         if (!self::exists($subscriber, $other)) {
189             // TRANS: Exception thrown when trying to unsibscribe without a subscription.
190             throw new AlreadyFulfilledException(_('Not subscribed!'));
191         }
192
193         // Don't allow deleting self subs
194
195         if ($subscriber->id == $other->id) {
196             // TRANS: Exception thrown when trying to unsubscribe a user from themselves.
197             throw new Exception(_('Could not delete self-subscription.'));
198         }
199
200         if (Event::handle('StartUnsubscribe', array($subscriber, $other))) {
201
202             $sub = Subscription::pkeyGet(array('subscriber' => $subscriber->id,
203                                                'subscribed' => $other->id));
204
205             // note we checked for existence above
206
207             assert(!empty($sub));
208
209             $result = $sub->delete();
210
211             if (!$result) {
212                 common_log_db_error($sub, 'DELETE', __FILE__);
213                 // TRANS: Exception thrown when a subscription could not be deleted on the server.
214                 throw new Exception(_('Could not delete subscription.'));
215             }
216
217             self::blow('user:notices_with_friends:%d', $subscriber->id);
218
219             self::blow('subscription:by-subscriber:'.$subscriber->id);
220             self::blow('subscription:by-subscribed:'.$other->id);
221
222             $subscriber->blowSubscriptionCount();
223             $other->blowSubscriberCount();
224
225             Event::handle('EndUnsubscribe', array($subscriber, $other));
226         }
227
228         return;
229     }
230
231     static function exists(Profile $subscriber, Profile $other)
232     {
233         $sub = Subscription::pkeyGet(array('subscriber' => $subscriber->id,
234                                            'subscribed' => $other->id));
235         return ($sub instanceof Subscription);
236     }
237
238     function asActivity()
239     {
240         $subscriber = Profile::getKV('id', $this->subscriber);
241         $subscribed = Profile::getKV('id', $this->subscribed);
242
243         if (!$subscriber instanceof Profile) {
244             throw new NoProfileException($this->subscriber);
245         }
246
247         if (!$subscribed instanceof Profile) {
248             throw new NoProfileException($this->subscribed);
249         }
250
251         $act = new Activity();
252
253         $act->verb = ActivityVerb::FOLLOW;
254
255         // XXX: rationalize this with the URL
256
257         $act->id   = $this->getURI();
258
259         $act->time    = strtotime($this->created);
260         // TRANS: Activity title when subscribing to another person.
261         $act->title = _m('TITLE','Follow');
262         // TRANS: Notification given when one person starts following another.
263         // TRANS: %1$s is the subscriber, %2$s is the subscribed.
264         $act->content = sprintf(_('%1$s is now following %2$s.'),
265                                $subscriber->getBestName(),
266                                $subscribed->getBestName());
267
268         $act->actor     = ActivityObject::fromProfile($subscriber);
269         $act->objects[] = ActivityObject::fromProfile($subscribed);
270
271         $url = common_local_url('AtomPubShowSubscription',
272                                 array('subscriber' => $subscriber->id,
273                                       'subscribed' => $subscribed->id));
274
275         $act->selfLink = $url;
276         $act->editLink = $url;
277
278         return $act;
279     }
280
281     /**
282      * Stream of subscriptions with the same subscriber
283      *
284      * Useful for showing pages that list subscriptions in reverse
285      * chronological order. Has offset & limit to make paging
286      * easy.
287      *
288      * @param integer $profile_id   ID of the subscriber profile
289      * @param integer $offset       Offset from latest
290      * @param integer $limit        Maximum number to fetch
291      *
292      * @return Subscription stream of subscriptions; use fetch() to iterate
293      */
294     public static function bySubscriber($profile_id, $offset = 0, $limit = PROFILES_PER_PAGE)
295     {
296         // "by subscriber" means it is the list of subscribed users we want
297         $ids = self::getSubscribedIDs($profile_id, $offset, $limit);
298         return Subscription::listFind('subscribed', $ids);
299     }
300
301     /**
302      * Stream of subscriptions with the same subscriber
303      *
304      * Useful for showing pages that list subscriptions in reverse
305      * chronological order. Has offset & limit to make paging
306      * easy.
307      *
308      * @param integer $profile_id   ID of the subscribed profile
309      * @param integer $offset       Offset from latest
310      * @param integer $limit        Maximum number to fetch
311      *
312      * @return Subscription stream of subscriptions; use fetch() to iterate
313      */
314     public static function bySubscribed($profile_id, $offset = 0, $limit = PROFILES_PER_PAGE)
315     {
316         // "by subscribed" means it is the list of subscribers we want
317         $ids = self::getSubscriberIDs($profile_id, $offset, $limit);
318         return Subscription::listFind('subscriber', $ids);
319     }
320
321
322     // The following are helper functions to the subscription lists,
323     // notably the public ones get used in places such as Profile
324     public static function getSubscribedIDs($profile_id, $offset, $limit) {
325         return self::getSubscriptionIDs('subscribed', $profile_id, $offset, $limit);
326     }
327
328     public static function getSubscriberIDs($profile_id, $offset, $limit) {
329         return self::getSubscriptionIDs('subscriber', $profile_id, $offset, $limit);
330     }
331
332     private static function getSubscriptionIDs($get_type, $profile_id, $offset, $limit)
333     {
334         switch ($get_type) {
335         case 'subscribed':
336             $by_type  = 'subscriber';
337             break;
338         case 'subscriber':
339             $by_type  = 'subscribed';
340             break;
341         default:
342             throw new Exception('Bad type argument to getSubscriptionIDs');
343         }
344
345         $cacheKey = 'subscription:by-'.$by_type.':'.$profile_id;
346
347         $queryoffset = $offset;
348         $querylimit = $limit;
349
350         if ($offset + $limit <= self::CACHE_WINDOW) {
351             // Oh, it seems it should be cached
352             $ids = self::cacheGet($cacheKey);
353             if (is_array($ids)) {
354                 return array_slice($ids, $offset, $limit);
355             }
356             // Being here indicates we didn't find anything cached
357             // so we'll have to fill it up simultaneously
358             $queryoffset = 0;
359             $querylimit  = self::CACHE_WINDOW;
360         }
361
362         $sub = new Subscription();
363         $sub->$by_type = $profile_id;
364         $sub->selectAdd($get_type);
365         $sub->whereAdd("{$get_type} != {$profile_id}");
366         $sub->orderBy('created DESC');
367         $sub->limit($queryoffset, $querylimit);
368
369         if (!$sub->find()) {
370             return array();
371         }
372
373         $ids = $sub->fetchAll($get_type);
374
375         // If we're simultaneously filling up cache, remember to slice
376         if ($offset === 0 && $querylimit === self::CACHE_WINDOW) {
377             self::cacheSet($cacheKey, $ids);
378             return array_slice($ids, $offset, $limit);
379         }
380
381         return $ids;
382     }
383
384     /**
385      * Flush cached subscriptions when subscription is updated
386      *
387      * Because we cache subscriptions, it's useful to flush them
388      * here.
389      *
390      * @param mixed $dataObject Original version of object
391      *
392      * @return boolean success flag.
393      */
394     function update($dataObject=false)
395     {
396         self::blow('subscription:by-subscriber:'.$this->subscriber);
397         self::blow('subscription:by-subscribed:'.$this->subscribed);
398
399         return parent::update($dataObject);
400     }
401
402     function getURI()
403     {
404         if (!empty($this->uri)) {
405             return $this->uri;
406         } else {
407             return self::newURI($this->subscriber, $this->subscribed, $this->created);
408         }
409     }
410
411     static function newURI($subscriber_id, $subscribed_id, $created)
412     {
413         return TagURI::mint('follow:%d:%d:%s',
414                             $subscriber_id,
415                             $subscribed_id,
416                             common_date_iso8601($created));
417     }
418 }