lib/rssaction.php

   1 <?php
   2 /**
   3  * StatusNet, the distributed open-source microblogging tool
   4  *
   5  * Base class for RSS 1.0 feed actions
   6  *
   7  * PHP version 5
   8  *
   9  * LICENCE: This program is free software: you can redistribute it and/or modify
  10  * it under the terms of the GNU Affero General Public License as published by
  11  * the Free Software Foundation, either version 3 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU Affero General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Affero General Public License
  20  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21  *
  22  * @category  Mail
  23  * @package   StatusNet
  24  * @author    Evan Prodromou <evan@status.net>
  25  * @author    Earle Martin <earle@downlode.org>
  26  * @copyright 2008-9 StatusNet, Inc.
  27  * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
  28  * @link      http://status.net/
  29  */
  30
  31 if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
  32
  33 define('DEFAULT_RSS_LIMIT', 48);
  34
  35 class Rss10Action extends Action
  36 {
  37     // This will contain the details of each feed item's author and be used to generate SIOC data.
  38
  39     var $creators = array();
  40     var $limit = DEFAULT_RSS_LIMIT;
  41     var $notices = null;
  42     var $tags_already_output = array();
  43
  44     /**
  45      * Constructor
  46      *
  47      * Just wraps the Action constructor.
  48      *
  49      * @param string  $output URI to output to, default = stdout
  50      * @param boolean $indent Whether to indent output, default true
  51      *
  52      * @see Action::__construct
  53      */
  54
  55     function __construct($output='php://output', $indent=null)
  56     {
  57         parent::__construct($output, $indent);
  58     }
  59
  60     /**
  61      * Do we need to write to the database?
  62      *
  63      * @return boolean true
  64      */
  65
  66     function isReadonly()
  67     {
  68         return true;
  69     }
  70
  71     /**
  72      * Read arguments and initialize members
  73      *
  74      * @param array $args Arguments from $_REQUEST
  75      * @return boolean success
  76      */
  77
  78     function prepare(array $args=array())
  79     {
  80         parent::prepare($args);
  81
  82         $this->limit = (int) $this->trimmed('limit');
  83
  84         if ($this->limit == 0) {
  85             $this->limit = DEFAULT_RSS_LIMIT;
  86         }
  87
  88         if (common_config('site', 'private')) {
  89             if (!isset($_SERVER['PHP_AUTH_USER'])) {
  90
  91                 // This header makes basic auth go
  92                 header('WWW-Authenticate: Basic realm="GNU social RSS"');
  93
  94                 // If the user hits cancel -- bam!
  95                 $this->show_basic_auth_error();
  96                 return;
  97             } else {
  98                 $nickname = $_SERVER['PHP_AUTH_USER'];
  99                 $password = $_SERVER['PHP_AUTH_PW'];
 100
 101                 if (!common_check_user($nickname, $password)) {
 102                     // basic authentication failed
 103                     list($proxy, $ip) = common_client_ip();
 104
 105                     common_log(LOG_WARNING, "Failed RSS auth attempt, nickname = $nickname, proxy = $proxy, ip = $ip.");
 106                     $this->show_basic_auth_error();
 107                     return;
 108                 }
 109             }
 110         }
 111
 112         return true;
 113     }
 114
 115     /**
 116      * Handle a request
 117      *
 118      * @param array $args Arguments from $_REQUEST
 119      *
 120      * @return void
 121      */
 122
 123     function handle(array $args=array())
 124     {
 125         // Parent handling, including cache check
 126         parent::handle($args);
 127         $this->showRss();
 128     }
 129
 130     function show_basic_auth_error()
 131     {
 132         header('HTTP/1.1 401 Unauthorized');
 133         header('Content-Type: application/xml; charset=utf-8');
 134         $this->startXML();
 135         $this->elementStart('hash');
 136         $this->element('error', null, 'Could not authenticate you.');
 137         $this->element('request', null, $_SERVER['REQUEST_URI']);
 138         $this->elementEnd('hash');
 139         $this->endXML();
 140     }
 141
 142     /**
 143      * Get the notices to output in this stream.
 144      *
 145      * @return array an array of Notice objects sorted in reverse chron
 146      */
 147
 148     function getNotices()
 149     {
 150         return array();
 151     }
 152
 153     /**
 154      * Get a description of the channel
 155      *
 156      * Returns an array with the following
 157      * @return array
 158      */
 159
 160     function getChannel()
 161     {
 162         return array('url' => '',
 163                      'title' => '',
 164                      'link' => '',
 165                      'description' => '');
 166     }
 167
 168     function getImage()
 169     {
 170         return null;
 171     }
 172
 173     function showRss()
 174     {
 175         $this->initRss();
 176         $this->showChannel();
 177         $this->showImage();
 178
 179         if (count($this->notices)) {
 180             foreach ($this->notices as $n) {
 181                 try {
 182                     $this->showItem($n);
 183                 } catch (Exception $e) {
 184                     // log exceptions and continue
 185                     common_log(LOG_ERR, $e->getMessage());
 186                     continue;
 187                 }
 188             }
 189         }
 190
 191         $this->showCreators();
 192         $this->endRss();
 193     }
 194
 195     function showChannel()
 196     {
 197
 198         $channel = $this->getChannel();
 199         $image = $this->getImage();
 200
 201         $this->elementStart('channel', array('rdf:about' => $channel['url']));
 202         $this->element('title', null, $channel['title']);
 203         $this->element('link', null, $channel['link']);
 204         $this->element('description', null, $channel['description']);
 205         $this->element('cc:licence', array('rdf:resource' => common_config('license','url')));
 206
 207         if ($image) {
 208             $this->element('image', array('rdf:resource' => $image));
 209         }
 210
 211         $this->elementStart('items');
 212         $this->elementStart('rdf:Seq');
 213
 214         if (count($this->notices)) {
 215             foreach ($this->notices as $notice) {
 216                 $this->element('rdf:li', array('rdf:resource' => $notice->uri));
 217             }
 218         }
 219
 220         $this->elementEnd('rdf:Seq');
 221         $this->elementEnd('items');
 222
 223         $this->elementEnd('channel');
 224     }
 225
 226     function showImage()
 227     {
 228         $image = $this->getImage();
 229         if ($image) {
 230             $channel = $this->getChannel();
 231             $this->elementStart('image', array('rdf:about' => $image));
 232             $this->element('title', null, $channel['title']);
 233             $this->element('link', null, $channel['link']);
 234             $this->element('url', null, $image);
 235             $this->elementEnd('image');
 236         }
 237     }
 238
 239     function showItem($notice)
 240     {
 241         $profile = $notice->getProfile();
 242         $nurl = common_local_url('shownotice', array('notice' => $notice->id));
 243         $creator_uri = common_profile_uri($profile);
 244         $this->elementStart('item', array('rdf:about' => $notice->uri,
 245                             'rdf:type' => 'http://rdfs.org/sioc/types#MicroblogPost'));
 246         $title = $profile->nickname . ': ' . common_xml_safe_str(trim($notice->content));
 247         $this->element('title', null, $title);
 248         $this->element('link', null, $nurl);
 249         $this->element('description', null, $profile->nickname."'s status on ".common_exact_date($notice->created));
 250         if ($notice->rendered) {
 251             $this->element('content:encoded', null, common_xml_safe_str($notice->rendered));
 252         }
 253         $this->element('dc:date', null, common_date_w3dtf($notice->created));
 254         $this->element('dc:creator', null, ($profile->fullname) ? $profile->fullname : $profile->nickname);
 255         $this->element('foaf:maker', array('rdf:resource' => $creator_uri));
 256         $this->element('sioc:has_creator', array('rdf:resource' => $creator_uri.'#acct'));
 257         $location = $notice->getLocation();
 258         if ($location && isset($location->lat) && isset($location->lon)) {
 259             $location_uri = $location->getRdfURL();
 260             $attrs = array('geo:lat' => $location->lat,
 261                 'geo:long' => $location->lon);
 262             if (strlen($location_uri)) {
 263                 $attrs['rdf:resource'] = $location_uri;
 264             }
 265             $this->element('statusnet:origin', $attrs);
 266         }
 267         $this->element('statusnet:postIcon', array('rdf:resource' => $profile->avatarUrl()));
 268         $this->element('cc:licence', array('rdf:resource' => common_config('license', 'url')));
 269         if ($notice->reply_to) {
 270             $replyurl = common_local_url('shownotice', array('notice' => $notice->reply_to));
 271             $this->element('sioc:reply_of', array('rdf:resource' => $replyurl));
 272         }
 273         if (!empty($notice->conversation)) {
 274             $conversationurl = common_local_url('conversation',
 275                                          array('id' => $notice->conversation));
 276             $this->element('sioc:has_discussion', array('rdf:resource' => $conversationurl));
 277         }
 278         $attachments = $notice->attachments();
 279         if($attachments){
 280             foreach($attachments as $attachment){
 281                 try {
 282                     $enclosure = $attachment->getEnclosure();
 283                     $attribs = array('rdf:resource' => $enclosure->url);
 284                     if ($enclosure->title) {
 285                         $attribs['dc:title'] = $enclosure->title;
 286                     }
 287                     if ($enclosure->modified) {
 288                         $attribs['dc:date'] = common_date_w3dtf($enclosure->modified);
 289                     }
 290                     if ($enclosure->size) {
 291                         $attribs['enc:length'] = $enclosure->size;
 292                     }
 293                     if ($enclosure->mimetype) {
 294                         $attribs['enc:type'] = $enclosure->mimetype;
 295                     }
 296                     $this->element('enc:enclosure', $attribs);
 297                 } catch (ServerException $e) {
 298                     // There was not enough metadata available
 299                 }
 300                 $this->element('sioc:links_to', array('rdf:resource'=>$attachment->url));
 301             }
 302         }
 303
 304         $tag = new Notice_tag();
 305         $tag->notice_id = $notice->id;
 306         if ($tag->find()) {
 307             $entry['tags']=array();
 308             while ($tag->fetch()) {
 309                 $tagpage = common_local_url('tag', array('tag' => $tag->tag));
 310
 311                 if ( in_array($tag, $this->tags_already_output) ) {
 312                     $this->element('ctag:tagged', array('rdf:resource'=>$tagpage.'#concept'));
 313                     continue;
 314                 }
 315
 316                 $tagrss  = common_local_url('tagrss', array('tag' => $tag->tag));
 317                 $this->elementStart('ctag:tagged');
 318                 $this->elementStart('ctag:Tag', array('rdf:about'=>$tagpage.'#concept', 'ctag:label'=>$tag->tag));
 319                 $this->element('foaf:page', array('rdf:resource'=>$tagpage));
 320                 $this->element('rdfs:seeAlso', array('rdf:resource'=>$tagrss));
 321                 $this->elementEnd('ctag:Tag');
 322                 $this->elementEnd('ctag:tagged');
 323
 324                 $this->tags_already_output[] = $tag->tag;
 325             }
 326         }
 327         $this->elementEnd('item');
 328         $this->creators[$creator_uri] = $profile;
 329     }
 330
 331     function showCreators()
 332     {
 333         foreach ($this->creators as $uri => $profile) {
 334             $id = $profile->id;
 335             $nickname = $profile->nickname;
 336             $this->elementStart('foaf:Agent', array('rdf:about' => $uri));
 337             $this->element('foaf:nick', null, $nickname);
 338             if ($profile->fullname) {
 339                 $this->element('foaf:name', null, $profile->fullname);
 340             }
 341             $this->element('foaf:holdsAccount', array('rdf:resource' => $uri.'#acct'));
 342             $avatar = $profile->avatarUrl();
 343             $this->element('foaf:depiction', array('rdf:resource' => $avatar));
 344             $this->elementEnd('foaf:Agent');
 345         }
 346     }
 347
 348     function initRss()
 349     {
 350         $channel = $this->getChannel();
 351         header('Content-Type: application/rdf+xml');
 352
 353         $this->startXml();
 354         $this->elementStart('rdf:RDF', array('xmlns:rdf' =>
 355                                               'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
 356                                               'xmlns:dc' =>
 357                                               'http://purl.org/dc/elements/1.1/',
 358                                               'xmlns:cc' =>
 359                                               'http://creativecommons.org/ns#',
 360                                               'xmlns:content' =>
 361                                               'http://purl.org/rss/1.0/modules/content/',
 362                                               'xmlns:ctag' =>
 363                                               'http://commontag.org/ns#',
 364                                               'xmlns:foaf' =>
 365                                               'http://xmlns.com/foaf/0.1/',
 366                                               'xmlns:enc' =>
 367                                               'http://purl.oclc.org/net/rss_2.0/enc#',
 368                                               'xmlns:sioc' =>
 369                                               'http://rdfs.org/sioc/ns#',
 370                                               'xmlns:sioct' =>
 371                                               'http://rdfs.org/sioc/types#',
 372                                               'xmlns:rdfs' =>
 373                                               'http://www.w3.org/2000/01/rdf-schema#',
 374                                               'xmlns:geo' =>
 375                                               'http://www.w3.org/2003/01/geo/wgs84_pos#',
 376                                               'xmlns:statusnet' =>
 377                                               'http://status.net/ont/',
 378                                               'xmlns' => 'http://purl.org/rss/1.0/'));
 379         $this->elementStart('sioc:Site', array('rdf:about' => common_root_url()));
 380         $this->element('sioc:name', null, common_config('site', 'name'));
 381         $this->elementStart('sioc:space_of');
 382         $this->element('sioc:Container', array('rdf:about' =>
 383                                                $channel['url']));
 384         $this->elementEnd('sioc:space_of');
 385         $this->elementEnd('sioc:Site');
 386     }
 387
 388     function endRss()
 389     {
 390         $this->elementEnd('rdf:RDF');
 391     }
 392
 393     /**
 394      * When was this page last modified?
 395      *
 396      */
 397
 398     function lastModified()
 399     {
 400         if (empty($this->notices)) {
 401             return null;
 402         }
 403
 404         if (count($this->notices) == 0) {
 405             return null;
 406         }
 407
 408         // FIXME: doesn't handle modified profiles, avatars, deleted notices
 409
 410         return strtotime($this->notices[0]->created);
 411     }
 412 }
 413