actions/atompubmembershipfeed.php

   1 <?php
   2 /**
   3  * StatusNet - the distributed open-source microblogging tool
   4  * Copyright (C) 2010, StatusNet, Inc.
   5  *
   6  * Feed of group memberships for a user, in ActivityStreams format
   7  *
   8  * PHP version 5
   9  *
  10  * This program is free software: you can redistribute it and/or modify
  11  * it under the terms of the GNU Affero General Public License as published by
  12  * the Free Software Foundation, either version 3 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU Affero General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Affero General Public License
  21  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22  *
  23  * @category  AtomPub
  24  * @package   StatusNet
  25  * @author    Evan Prodromou <evan@status.net>
  26  * @copyright 2010 StatusNet, Inc.
  27  * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
  28  * @link      http://status.net/
  29  */
  30
  31 if (!defined('STATUSNET')) {
  32     // This check helps protect against security problems;
  33     // your code file can't be executed directly from the web.
  34     exit(1);
  35 }
  36
  37 require_once INSTALLDIR . '/lib/apiauth.php';
  38
  39 /**
  40  * Feed of group memberships for a user, in ActivityStreams format
  41  *
  42  * @category  Action
  43  * @package   StatusNet
  44  * @author    Evan Prodromou <evan@status.net>
  45  * @copyright 2010 StatusNet, Inc.
  46  * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
  47  * @link      http://status.net/
  48  */
  49 class AtompubmembershipfeedAction extends ApiAuthAction
  50 {
  51     private $_profile     = null;
  52     private $_memberships = null;
  53
  54     /**
  55      * For initializing members of the class.
  56      *
  57      * @param array $argarray misc. arguments
  58      *
  59      * @return boolean true
  60      */
  61     function prepare($argarray)
  62     {
  63         parent::prepare($argarray);
  64
  65         $profileId = $this->trimmed('profile');
  66
  67         $this->_profile = Profile::staticGet('id', $profileId);
  68
  69         if (empty($this->_profile)) {
  70             // TRANS: Client exception.
  71             throw new ClientException(_('No such profile.'), 404);
  72         }
  73
  74         $offset = ($this->page-1) * $this->count;
  75         $limit  = $this->count + 1;
  76
  77         $this->_memberships = Group_member::byMember($this->_profile->id,
  78                                                      $offset,
  79                                                      $limit);
  80
  81         return true;
  82     }
  83
  84     /**
  85      * Handler method
  86      *
  87      * @param array $argarray is ignored since it's now passed in in prepare()
  88      *
  89      * @return void
  90      */
  91     function handle($argarray=null)
  92     {
  93         parent::handle($argarray);
  94
  95         switch ($_SERVER['REQUEST_METHOD']) {
  96         case 'HEAD':
  97         case 'GET':
  98             $this->showFeed();
  99             break;
 100         case 'POST':
 101             $this->addMembership();
 102             break;
 103         default:
 104             // TRANS: Client exception thrown when using an unsupported HTTP method.
 105             throw new ClientException(_('HTTP method not supported.'), 405);
 106             return;
 107         }
 108
 109         return;
 110     }
 111
 112     /**
 113      * Show a feed of favorite activity streams objects
 114      *
 115      * @return void
 116      */
 117     function showFeed()
 118     {
 119         header('Content-Type: application/atom+xml; charset=utf-8');
 120
 121         $url = common_local_url('AtomPubMembershipFeed',
 122                                 array('profile' => $this->_profile->id));
 123
 124         $feed = new Atom10Feed(true);
 125
 126         $feed->addNamespace('activity',
 127                             'http://activitystrea.ms/spec/1.0/');
 128
 129         $feed->addNamespace('poco',
 130                             'http://portablecontacts.net/spec/1.0');
 131
 132         $feed->addNamespace('media',
 133                             'http://purl.org/syndication/atommedia');
 134
 135         $feed->id = $url;
 136
 137         $feed->setUpdated('now');
 138
 139         $feed->addAuthor($this->_profile->getBestName(),
 140                          $this->_profile->getURI());
 141
 142         // TRANS: Title for group membership feed.
 143         // TRANS: %s is a username.
 144         $feed->setTitle(sprintf(_('Group memberships of %s'),
 145                                 $this->_profile->getBestName()));
 146
 147         // TRANS: Subtitle for group membership feed.
 148         // TRANS: %1$s is a username, %2$s is the StatusNet sitename.
 149         $feed->setSubtitle(sprintf(_('Groups %1$s is a member of on %2$s'),
 150                                    $this->_profile->getBestName(),
 151                                    common_config('site', 'name')));
 152
 153         $feed->addLink(common_local_url('usergroups',
 154                                         array('nickname' =>
 155                                               $this->_profile->nickname)));
 156
 157         $feed->addLink($url,
 158                        array('rel' => 'self',
 159                              'type' => 'application/atom+xml'));
 160
 161         // If there's more...
 162
 163         if ($this->page > 1) {
 164             $feed->addLink($url,
 165                            array('rel' => 'first',
 166                                  'type' => 'application/atom+xml'));
 167
 168             $feed->addLink(common_local_url('AtomPubMembershipFeed',
 169                                             array('profile' =>
 170                                                   $this->_profile->id),
 171                                             array('page' =>
 172                                                   $this->page - 1)),
 173                            array('rel' => 'prev',
 174                                  'type' => 'application/atom+xml'));
 175         }
 176
 177         if ($this->_memberships->N > $this->count) {
 178
 179             $feed->addLink(common_local_url('AtomPubMembershipFeed',
 180                                             array('profile' =>
 181                                                   $this->_profile->id),
 182                                             array('page' =>
 183                                                   $this->page + 1)),
 184                            array('rel' => 'next',
 185                                  'type' => 'application/atom+xml'));
 186         }
 187
 188         $i = 0;
 189
 190         while ($this->_memberships->fetch()) {
 191
 192             // We get one more than needed; skip that one
 193
 194             $i++;
 195
 196             if ($i > $this->count) {
 197                 break;
 198             }
 199
 200             $act = $this->_memberships->asActivity();
 201             $feed->addEntryRaw($act->asString(false, false, false));
 202         }
 203
 204         $this->raw($feed->getString());
 205     }
 206
 207     /**
 208      * add a new favorite
 209      *
 210      * @return void
 211      */
 212     function addMembership()
 213     {
 214         // XXX: Refactor this; all the same for atompub
 215
 216         if (empty($this->auth_user) ||
 217             $this->auth_user->id != $this->_profile->id) {
 218             // TRANS: Client exception thrown when trying subscribe someone else to a group.
 219             throw new ClientException(_("Cannot add someone else's".
 220                                         " membership."), 403);
 221         }
 222
 223         $xml = file_get_contents('php://input');
 224
 225         $dom = DOMDocument::loadXML($xml);
 226
 227         if ($dom->documentElement->namespaceURI != Activity::ATOM ||
 228             $dom->documentElement->localName != 'entry') {
 229             // TRANS: Client error displayed when not using an Atom entry.
 230             throw new ClientException(_('Atom post must be an Atom entry.'));
 231             return;
 232         }
 233
 234         $activity = new Activity($dom->documentElement);
 235
 236         $membership = null;
 237
 238         if (Event::handle('StartAtomPubNewActivity', array(&$activity))) {
 239             if ($activity->verb != ActivityVerb::JOIN) {
 240                 // TRANS: Client error displayed when not using the join verb.
 241                 throw new ClientException(_('Can only handle join activities.'));
 242                 return;
 243             }
 244
 245             $groupObj = $activity->objects[0];
 246
 247             if ($groupObj->type != ActivityObject::GROUP) {
 248                 // TRANS: Client exception thrown when trying favorite an object that is not a notice.
 249                 throw new ClientException(_('Can only fave notices.'));
 250                 return;
 251             }
 252
 253             $group = User_group::staticGet('uri', $groupObj->id);
 254
 255             if (empty($group)) {
 256                 // XXX: import from listed URL or something
 257                 // TRANS: Client exception thrown when trying to subscribe to a non-existing group.
 258                 throw new ClientException(_('Unknown group.'));
 259             }
 260
 261             $old = Group_member::pkeyGet(array('profile_id' => $this->auth_user->id,
 262                                                'group_id' => $group->id));
 263
 264             if (!empty($old)) {
 265                 // TRANS: Client exception thrown when trying to subscribe to an already subscribed group.
 266                 throw new ClientException(_('Already a member.'));
 267             }
 268
 269             $profile = $this->auth_user->getProfile();
 270
 271             if (Group_block::isBlocked($group, $profile)) {
 272                 // XXX: import from listed URL or something
 273                 // TRANS: Client exception thrown when trying to subscribe to group while blocked from that group.
 274                 throw new ClientException(_('Blocked by admin.'));
 275             }
 276
 277             $this->auth_user->joinGroup($group);
 278
 279             Event::handle('EndAtomPubNewActivity', array($activity, $membership));
 280         }
 281
 282         if (!empty($membership)) {
 283             $act = $membership->asActivity();
 284
 285             header('Content-Type: application/atom+xml; charset=utf-8');
 286             header('Content-Location: ' . $act->selfLink);
 287
 288             $this->startXML();
 289             $this->raw($act->asString(true, true, true));
 290             $this->endXML();
 291         }
 292     }
 293
 294     /**
 295      * Return true if read only.
 296      *
 297      * MAY override
 298      *
 299      * @param array $args other arguments
 300      *
 301      * @return boolean is read only action?
 302      */
 303     function isReadOnly($args)
 304     {
 305         if ($_SERVER['REQUEST_METHOD'] == 'GET' ||
 306             $_SERVER['REQUEST_METHOD'] == 'HEAD') {
 307             return true;
 308         } else {
 309             return false;
 310         }
 311     }
 312
 313     /**
 314      * Return last modified, if applicable.
 315      *
 316      * MAY override
 317      *
 318      * @return string last modified http header
 319      */
 320     function lastModified()
 321     {
 322         // For comparison with If-Last-Modified
 323         // If not applicable, return null
 324         return null;
 325     }
 326
 327     /**
 328      * Return etag, if applicable.
 329      *
 330      * MAY override
 331      *
 332      * @return string etag http header
 333      */
 334     function etag()
 335     {
 336         return null;
 337     }
 338
 339     /**
 340      * Does this require authentication?
 341      *
 342      * @return boolean true if delete, else false
 343      */
 344     function requiresAuth()
 345     {
 346         if ($_SERVER['REQUEST_METHOD'] == 'GET' ||
 347             $_SERVER['REQUEST_METHOD'] == 'HEAD') {
 348             return false;
 349         } else {
 350             return true;
 351         }
 352     }
 353 }