lib/twitterapi.php

   1 <?php
   2 /*
   3  * Laconica - a distributed open-source microblogging tool
   4  * Copyright (C) 2008, 2009, Control Yourself, 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('LACONICA')) {
  21     exit(1);
  22 }
  23
  24 class TwitterapiAction extends Action
  25 {
  26
  27     var $auth_user;
  28
  29     /**
  30      * Initialization.
  31      *
  32      * @param array $args Web and URL arguments
  33      *
  34      * @return boolean false if user doesn't exist
  35      */
  36
  37     function prepare($args)
  38     {
  39         parent::prepare($args);
  40         return true;
  41     }
  42
  43     /**
  44      * Handle a request
  45      *
  46      * @param array $args Arguments from $_REQUEST
  47      *
  48      * @return void
  49      */
  50
  51     function handle($args)
  52     {
  53         parent::handle($args);
  54     }
  55
  56     /**
  57      * Overrides XMLOutputter::element to write booleans as strings (true|false).
  58      * See that method's documentation for more info.
  59      *
  60      * @param string $tag     Element type or tagname
  61      * @param array  $attrs   Array of element attributes, as
  62      *                        key-value pairs
  63      * @param string $content string content of the element
  64      *
  65      * @return void
  66      */
  67     function element($tag, $attrs=null, $content=null)
  68     {
  69         if (is_bool($content)) {
  70             $content = ($content ? 'true' : 'false');
  71         }
  72
  73         return parent::element($tag, $attrs, $content);
  74     }
  75
  76     function twitter_user_array($profile, $get_notice=false)
  77     {
  78         $twitter_user = array();
  79
  80         $twitter_user['id'] = intval($profile->id);
  81         $twitter_user['name'] = $profile->getBestName();
  82         $twitter_user['screen_name'] = $profile->nickname;
  83         $twitter_user['location'] = ($profile->location) ? $profile->location : null;
  84         $twitter_user['description'] = ($profile->bio) ? $profile->bio : null;
  85
  86         $avatar = $profile->getAvatar(AVATAR_STREAM_SIZE);
  87         $twitter_user['profile_image_url'] = ($avatar) ? $avatar->displayUrl() :
  88             Avatar::defaultImage(AVATAR_STREAM_SIZE);
  89
  90         $twitter_user['url'] = ($profile->homepage) ? $profile->homepage : null;
  91         $twitter_user['protected'] = false; # not supported by Laconica yet
  92         $twitter_user['followers_count'] = $profile->subscriberCount();
  93
  94         // To be supported soon...
  95         $twitter_user['profile_background_color'] = '';
  96         $twitter_user['profile_text_color'] = '';
  97         $twitter_user['profile_link_color'] = '';
  98         $twitter_user['profile_sidebar_fill_color'] = '';
  99         $twitter_user['profile_sidebar_border_color'] = '';
 100
 101         $twitter_user['friends_count'] = $profile->subscriptionCount();
 102
 103         $twitter_user['created_at'] = $this->date_twitter($profile->created);
 104
 105         $twitter_user['favourites_count'] = $profile->faveCount(); // British spelling!
 106
 107         // Need to pull up the user for some of this
 108         $user = User::staticGet($profile->id);
 109
 110         $timezone = 'UTC';
 111
 112         if ($user->timezone) {
 113             $timezone = $user->timezone;
 114         }
 115
 116         $t = new DateTime;
 117         $t->setTimezone(new DateTimeZone($timezone));
 118
 119         $twitter_user['utc_offset'] = $t->format('Z');
 120         $twitter_user['time_zone'] = $timezone;
 121
 122         // To be supported some day, perhaps
 123         $twitter_user['profile_background_image_url'] = '';
 124         $twitter_user['profile_background_tile'] = false;
 125
 126         $twitter_user['statuses_count'] = $profile->noticeCount();
 127
 128         // Is the requesting user following this user?
 129         $twitter_user['following'] = false;
 130         $twitter_user['notifications'] = false;
 131
 132         if (isset($apidata['user'])) {
 133
 134             $twitter_user['following'] = $apidata['user']->isSubscribed($profile);
 135
 136             // Notifications on?
 137             $sub = Subscription::pkeyGet(array('subscriber' =>
 138                 $apidata['user']->id, 'subscribed' => $profile->id));
 139
 140             if ($sub) {
 141                 $twitter_user['notifications'] = ($sub->jabber || $sub->sms);
 142             }
 143         }
 144
 145         if ($get_notice) {
 146             $notice = $profile->getCurrentNotice();
 147             if ($notice) {
 148                 # don't get user!
 149                 $twitter_user['status'] = $this->twitter_status_array($notice, false);
 150             }
 151         }
 152
 153         return $twitter_user;
 154     }
 155
 156     function twitter_status_array($notice, $include_user=true)
 157     {
 158         $profile = $notice->getProfile();
 159
 160         $twitter_status = array();
 161         $twitter_status['text'] = $notice->content;
 162         $twitter_status['truncated'] = false; # Not possible on Laconica
 163         $twitter_status['created_at'] = $this->date_twitter($notice->created);
 164         $twitter_status['in_reply_to_status_id'] = ($notice->reply_to) ?
 165             intval($notice->reply_to) : null;
 166         $twitter_status['source'] = $this->source_link($notice->source);
 167         $twitter_status['id'] = intval($notice->id);
 168
 169         $replier_profile = null;
 170
 171         if ($notice->reply_to) {
 172             $reply = Notice::staticGet(intval($notice->reply_to));
 173             if ($reply) {
 174                 $replier_profile = $reply->getProfile();
 175             }
 176         }
 177
 178         $twitter_status['in_reply_to_user_id'] =
 179             ($replier_profile) ? intval($replier_profile->id) : null;
 180         $twitter_status['in_reply_to_screen_name'] =
 181             ($replier_profile) ? $replier_profile->nickname : null;
 182
 183         if (isset($this->auth_user)) {
 184             $twitter_status['favorited'] = $this->auth_user->hasFave($notice);
 185         } else {
 186             $twitter_status['favorited'] = false;
 187         }
 188
 189         # Enclosures
 190         $attachments = $notice->attachments();
 191         $twitter_status['attachments']=array();
 192         if($attachments){
 193             foreach($attachments as $attachment){
 194                 if ($attachment->isEnclosure()) {
 195                     $enclosure=array();
 196                     $enclosure['url']=$attachment->url;
 197                     $enclosure['mimetype']=$attachment->mimetype;
 198                     $enclosure['size']=$attachment->size;
 199                     $twitter_status['attachments'][]=$enclosure;
 200                 }
 201             }
 202         }
 203
 204         if ($include_user) {
 205             # Don't get notice (recursive!)
 206             $twitter_user = $this->twitter_user_array($profile, false);
 207             $twitter_status['user'] = $twitter_user;
 208         }
 209
 210         return $twitter_status;
 211     }
 212
 213     function twitter_rss_entry_array($notice)
 214     {
 215         $profile = $notice->getProfile();
 216         $entry = array();
 217
 218         # We trim() to avoid extraneous whitespace in the output
 219
 220         $entry['content'] = common_xml_safe_str(trim($notice->rendered));
 221         $entry['title'] = $profile->nickname . ': ' . common_xml_safe_str(trim($notice->content));
 222         $entry['link'] = common_local_url('shownotice', array('notice' => $notice->id));
 223         $entry['published'] = common_date_iso8601($notice->created);
 224
 225         $taguribase = common_config('integration', 'taguri');
 226         $entry['id'] = "tag:$taguribase:$entry[link]";
 227
 228         $entry['updated'] = $entry['published'];
 229         $entry['author'] = $profile->getBestName();
 230
 231         # Enclosure
 232         $attachments = $notice->attachments();
 233         if($attachments){
 234             $entry['enclosures']=array();
 235             foreach($attachments as $attachment){
 236                 if ($attachment->isEnclosure()) {
 237                     $enclosure=array();
 238                     $enclosure['url']=$attachment->url;
 239                     $enclosure['mimetype']=$attachment->mimetype;
 240                     $enclosure['size']=$attachment->size;
 241                     $entry['enclosures'][]=$enclosure;
 242                 }
 243             }
 244         }
 245
 246         # RSS Item specific
 247         $entry['description'] = $entry['content'];
 248         $entry['pubDate'] = common_date_rfc2822($notice->created);
 249         $entry['guid'] = $entry['link'];
 250
 251         return $entry;
 252     }
 253
 254     function twitter_rss_dmsg_array($message)
 255     {
 256
 257         $entry = array();
 258
 259         $entry['title'] = sprintf('Message from %s to %s',
 260             $message->getFrom()->nickname, $message->getTo()->nickname);
 261
 262         $entry['content'] = common_xml_safe_str(trim($message->content));
 263         $entry['link'] = common_local_url('showmessage', array('message' => $message->id));
 264         $entry['published'] = common_date_iso8601($message->created);
 265
 266         $taguribase = common_config('integration', 'taguri');
 267
 268         $entry['id'] = "tag:$taguribase,:$entry[link]";
 269         $entry['updated'] = $entry['published'];
 270         $entry['author'] = $message->getFrom()->getBestName();
 271
 272         # RSS Item specific
 273         $entry['description'] = $entry['content'];
 274         $entry['pubDate'] = common_date_rfc2822($message->created);
 275         $entry['guid'] = $entry['link'];
 276
 277         return $entry;
 278     }
 279
 280     function twitter_dmsg_array($message)
 281     {
 282         $twitter_dm = array();
 283
 284         $from_profile = $message->getFrom();
 285         $to_profile = $message->getTo();
 286
 287         $twitter_dm['id'] = $message->id;
 288         $twitter_dm['sender_id'] = $message->from_profile;
 289         $twitter_dm['text'] = trim($message->content);
 290         $twitter_dm['recipient_id'] = $message->to_profile;
 291         $twitter_dm['created_at'] = $this->date_twitter($message->created);
 292         $twitter_dm['sender_screen_name'] = $from_profile->nickname;
 293         $twitter_dm['recipient_screen_name'] = $to_profile->nickname;
 294         $twitter_dm['sender'] = $this->twitter_user_array($from_profile, false);
 295         $twitter_dm['recipient'] = $this->twitter_user_array($to_profile, false);
 296
 297         return $twitter_dm;
 298     }
 299
 300     function twitter_relationship_array($source, $target)
 301     {
 302         $relationship = array();
 303
 304         $relationship['source'] =
 305             $this->relationship_details_array($source, $target);
 306         $relationship['target'] =
 307             $this->relationship_details_array($target, $source);
 308
 309         return array('relationship' => $relationship);
 310     }
 311
 312     function relationship_details_array($source, $target)
 313     {
 314         $details = array();
 315
 316         $details['screen_name'] = $source->nickname;
 317         $details['followed_by'] = $target->isSubscribed($source);
 318         $details['following'] = $source->isSubscribed($target);
 319
 320         $notifications = false;
 321
 322         if ($source->isSubscribed($target)) {
 323
 324             $sub = Subscription::pkeyGet(array('subscriber' =>
 325                 $source->id, 'subscribed' => $target->id));
 326
 327             if (!empty($sub)) {
 328                 $notifications = ($sub->jabber || $sub->sms);
 329             }
 330         }
 331
 332         $details['notifications_enabled'] = $notifications;
 333         $details['blocking'] = $source->hasBlocked($target);
 334         $details['id'] = $source->id;
 335
 336         return $details;
 337     }
 338
 339     function show_twitter_xml_relationship($relationship)
 340     {
 341         $this->elementStart('relationship');
 342
 343         foreach($relationship as $element => $value) {
 344             if ($element == 'source' || $element == 'target') {
 345                 $this->elementStart($element);
 346                 $this->show_xml_relationship_details($value);
 347                 $this->elementEnd($element);
 348             }
 349         }
 350
 351         $this->elementEnd('relationship');
 352     }
 353
 354     function show_xml_relationship_details($details)
 355     {
 356         foreach($details as $element => $value) {
 357             $this->element($element, null, $value);
 358         }
 359     }
 360
 361     function show_twitter_xml_status($twitter_status)
 362     {
 363         $this->elementStart('status');
 364         foreach($twitter_status as $element => $value) {
 365             switch ($element) {
 366             case 'user':
 367                 $this->show_twitter_xml_user($twitter_status['user']);
 368                 break;
 369             case 'text':
 370                 $this->element($element, null, common_xml_safe_str($value));
 371                 break;
 372             default:
 373                 $this->element($element, null, $value);
 374             }
 375         }
 376         $this->elementEnd('status');
 377     }
 378
 379     function show_twitter_xml_user($twitter_user, $role='user')
 380     {
 381         $this->elementStart($role);
 382         foreach($twitter_user as $element => $value) {
 383             if ($element == 'status') {
 384                 $this->show_twitter_xml_status($twitter_user['status']);
 385             } else {
 386                 $this->element($element, null, $value);
 387             }
 388         }
 389         $this->elementEnd($role);
 390     }
 391
 392     function show_twitter_rss_item($entry)
 393     {
 394         $this->elementStart('item');
 395         $this->element('title', null, $entry['title']);
 396         $this->element('description', null, $entry['description']);
 397         $this->element('pubDate', null, $entry['pubDate']);
 398         $this->element('guid', null, $entry['guid']);
 399         $this->element('link', null, $entry['link']);
 400
 401         # RSS only supports 1 enclosure per item
 402         if($entry['enclosures']){
 403             $enclosure = $entry['enclosures'][0];
 404             $this->element('enclosure', array('url'=>$enclosure['url'],'type'=>$enclosure['mimetype'],'length'=>$enclosure['size']), null);
 405         }
 406
 407         $this->elementEnd('item');
 408     }
 409
 410     function show_json_objects($objects)
 411     {
 412         print(json_encode($objects));
 413     }
 414
 415     function show_single_xml_status($notice)
 416     {
 417         $this->init_document('xml');
 418         $twitter_status = $this->twitter_status_array($notice);
 419         $this->show_twitter_xml_status($twitter_status);
 420         $this->end_document('xml');
 421     }
 422
 423     function show_single_json_status($notice)
 424     {
 425         $this->init_document('json');
 426         $status = $this->twitter_status_array($notice);
 427         $this->show_json_objects($status);
 428         $this->end_document('json');
 429     }
 430
 431     function show_single_xml_dmsg($message)
 432     {
 433         $this->init_document('xml');
 434         $dmsg = $this->twitter_dmsg_array($message);
 435         $this->show_twitter_xml_dmsg($dmsg);
 436         $this->end_document('xml');
 437     }
 438
 439     function show_single_json_dmsg($message)
 440     {
 441         $this->init_document('json');
 442         $dmsg = $this->twitter_dmsg_array($message);
 443         $this->show_json_objects($dmsg);
 444         $this->end_document('json');
 445     }
 446
 447     function show_twitter_xml_dmsg($twitter_dm)
 448     {
 449         $this->elementStart('direct_message');
 450         foreach($twitter_dm as $element => $value) {
 451             switch ($element) {
 452             case 'sender':
 453             case 'recipient':
 454                 $this->show_twitter_xml_user($value, $element);
 455                 break;
 456             case 'text':
 457                 $this->element($element, null, common_xml_safe_str($value));
 458                 break;
 459             default:
 460                 $this->element($element, null, $value);
 461             }
 462         }
 463         $this->elementEnd('direct_message');
 464     }
 465
 466     function show_xml_timeline($notice)
 467     {
 468
 469         $this->init_document('xml');
 470         $this->elementStart('statuses', array('type' => 'array'));
 471
 472         if (is_array($notice)) {
 473             foreach ($notice as $n) {
 474                 $twitter_status = $this->twitter_status_array($n);
 475                 $this->show_twitter_xml_status($twitter_status);
 476             }
 477         } else {
 478             while ($notice->fetch()) {
 479                 $twitter_status = $this->twitter_status_array($notice);
 480                 $this->show_twitter_xml_status($twitter_status);
 481             }
 482         }
 483
 484         $this->elementEnd('statuses');
 485         $this->end_document('xml');
 486     }
 487
 488     function show_rss_timeline($notice, $title, $link, $subtitle, $suplink=null)
 489     {
 490
 491         $this->init_document('rss');
 492
 493         $this->elementStart('channel');
 494         $this->element('title', null, $title);
 495         $this->element('link', null, $link);
 496         if (!is_null($suplink)) {
 497             # For FriendFeed's SUP protocol
 498             $this->element('link', array('xmlns' => 'http://www.w3.org/2005/Atom',
 499                                          'rel' => 'http://api.friendfeed.com/2008/03#sup',
 500                                          'href' => $suplink,
 501                                          'type' => 'application/json'));
 502         }
 503         $this->element('description', null, $subtitle);
 504         $this->element('language', null, 'en-us');
 505         $this->element('ttl', null, '40');
 506
 507         if (is_array($notice)) {
 508             foreach ($notice as $n) {
 509                 $entry = $this->twitter_rss_entry_array($n);
 510                 $this->show_twitter_rss_item($entry);
 511             }
 512         } else {
 513             while ($notice->fetch()) {
 514                 $entry = $this->twitter_rss_entry_array($notice);
 515                 $this->show_twitter_rss_item($entry);
 516             }
 517         }
 518
 519         $this->elementEnd('channel');
 520         $this->end_twitter_rss();
 521     }
 522
 523     function show_atom_timeline($notice, $title, $id, $link, $subtitle=null, $suplink=null, $selfuri=null)
 524     {
 525
 526         $this->init_document('atom');
 527
 528         $this->element('title', null, $title);
 529         $this->element('id', null, $id);
 530         $this->element('link', array('href' => $link, 'rel' => 'alternate', 'type' => 'text/html'), null);
 531
 532         if (!is_null($suplink)) {
 533             # For FriendFeed's SUP protocol
 534             $this->element('link', array('rel' => 'http://api.friendfeed.com/2008/03#sup',
 535                                          'href' => $suplink,
 536                                          'type' => 'application/json'));
 537         }
 538
 539         if (!is_null($selfuri)) {
 540             $this->element('link', array('href' => $selfuri,
 541                 'rel' => 'self', 'type' => 'application/atom+xml'), null);
 542         }
 543
 544         $this->element('updated', null, common_date_iso8601('now'));
 545         $this->element('subtitle', null, $subtitle);
 546
 547         if (is_array($notice)) {
 548             foreach ($notice as $n) {
 549                 $this->raw($n->asAtomEntry());
 550             }
 551         } else {
 552             while ($notice->fetch()) {
 553                 $this->raw($notice->asAtomEntry());
 554             }
 555         }
 556
 557         $this->end_document('atom');
 558
 559     }
 560
 561     function show_json_timeline($notice)
 562     {
 563
 564         $this->init_document('json');
 565
 566         $statuses = array();
 567
 568         if (is_array($notice)) {
 569             foreach ($notice as $n) {
 570                 $twitter_status = $this->twitter_status_array($n);
 571                 array_push($statuses, $twitter_status);
 572             }
 573         } else {
 574             while ($notice->fetch()) {
 575                 $twitter_status = $this->twitter_status_array($notice);
 576                 array_push($statuses, $twitter_status);
 577             }
 578         }
 579
 580         $this->show_json_objects($statuses);
 581
 582         $this->end_document('json');
 583     }
 584
 585     // Anyone know what date format this is?
 586     // Twitter's dates look like this: "Mon Jul 14 23:52:38 +0000 2008" -- Zach
 587     function date_twitter($dt)
 588     {
 589         $t = strtotime($dt);
 590         return date("D M d H:i:s O Y", $t);
 591     }
 592
 593     // XXX: Candidate for a general utility method somewhere?
 594     function count_subscriptions($profile)
 595     {
 596
 597         $count = 0;
 598         $sub = new Subscription();
 599         $sub->subscribed = $profile->id;
 600
 601         $count = $sub->find();
 602
 603         if ($count > 0) {
 604             return $count - 1;
 605         } else {
 606             return 0;
 607         }
 608     }
 609
 610     function init_document($type='xml')
 611     {
 612         switch ($type) {
 613         case 'xml':
 614             header('Content-Type: application/xml; charset=utf-8');
 615             $this->startXML();
 616             break;
 617         case 'json':
 618             header('Content-Type: application/json; charset=utf-8');
 619
 620             // Check for JSONP callback
 621             $callback = $this->arg('callback');
 622             if ($callback) {
 623                 print $callback . '(';
 624             }
 625             break;
 626         case 'rss':
 627             header("Content-Type: application/rss+xml; charset=utf-8");
 628             $this->init_twitter_rss();
 629             break;
 630         case 'atom':
 631             header('Content-Type: application/atom+xml; charset=utf-8');
 632             $this->init_twitter_atom();
 633             break;
 634         default:
 635             $this->clientError(_('Not a supported data format.'));
 636             break;
 637         }
 638
 639         return;
 640     }
 641
 642     function end_document($type='xml')
 643     {
 644         switch ($type) {
 645         case 'xml':
 646             $this->endXML();
 647             break;
 648         case 'json':
 649
 650             // Check for JSONP callback
 651             $callback = $this->arg('callback');
 652             if ($callback) {
 653                 print ')';
 654             }
 655             break;
 656         case 'rss':
 657             $this->end_twitter_rss();
 658             break;
 659         case 'atom':
 660             $this->end_twitter_rss();
 661             break;
 662         default:
 663             $this->clientError(_('Not a supported data format.'));
 664             break;
 665         }
 666         return;
 667     }
 668
 669     function clientError($msg, $code = 400, $content_type = 'json')
 670     {
 671
 672         static $status = array(400 => 'Bad Request',
 673                                401 => 'Unauthorized',
 674                                402 => 'Payment Required',
 675                                403 => 'Forbidden',
 676                                404 => 'Not Found',
 677                                405 => 'Method Not Allowed',
 678                                406 => 'Not Acceptable',
 679                                407 => 'Proxy Authentication Required',
 680                                408 => 'Request Timeout',
 681                                409 => 'Conflict',
 682                                410 => 'Gone',
 683                                411 => 'Length Required',
 684                                412 => 'Precondition Failed',
 685                                413 => 'Request Entity Too Large',
 686                                414 => 'Request-URI Too Long',
 687                                415 => 'Unsupported Media Type',
 688                                416 => 'Requested Range Not Satisfiable',
 689                                417 => 'Expectation Failed');
 690
 691         $action = $this->trimmed('action');
 692
 693         common_debug("User error '$code' on '$action': $msg", __FILE__);
 694
 695         if (!array_key_exists($code, $status)) {
 696             $code = 400;
 697         }
 698
 699         $status_string = $status[$code];
 700         header('HTTP/1.1 '.$code.' '.$status_string);
 701
 702         if ($content_type == 'xml') {
 703             $this->init_document('xml');
 704             $this->elementStart('hash');
 705             $this->element('error', null, $msg);
 706             $this->element('request', null, $_SERVER['REQUEST_URI']);
 707             $this->elementEnd('hash');
 708             $this->end_document('xml');
 709         } else {
 710             $this->init_document('json');
 711             $error_array = array('error' => $msg, 'request' => $_SERVER['REQUEST_URI']);
 712             print(json_encode($error_array));
 713             $this->end_document('json');
 714         }
 715
 716     }
 717
 718     function init_twitter_rss()
 719     {
 720         $this->startXML();
 721         $this->elementStart('rss', array('version' => '2.0'));
 722     }
 723
 724     function end_twitter_rss()
 725     {
 726         $this->elementEnd('rss');
 727         $this->endXML();
 728     }
 729
 730     function init_twitter_atom()
 731     {
 732         $this->startXML();
 733         // FIXME: don't hardcode the language here!
 734         $this->elementStart('feed', array('xmlns' => 'http://www.w3.org/2005/Atom',
 735                                           'xml:lang' => 'en-US',
 736                                           'xmlns:thr' => 'http://purl.org/syndication/thread/1.0'));
 737     }
 738
 739     function end_twitter_atom()
 740     {
 741         $this->elementEnd('feed');
 742         $this->endXML();
 743     }
 744
 745     function show_profile($profile, $content_type='xml', $notice=null)
 746     {
 747         $profile_array = $this->twitter_user_array($profile, true);
 748         switch ($content_type) {
 749         case 'xml':
 750             $this->show_twitter_xml_user($profile_array);
 751             break;
 752         case 'json':
 753             $this->show_json_objects($profile_array);
 754             break;
 755         default:
 756             $this->clientError(_('Not a supported data format.'));
 757             return;
 758         }
 759         return;
 760     }
 761
 762     function get_user($id, $apidata=null)
 763     {
 764         if (empty($id)) {
 765
 766             // Twitter supports these other ways of passing the user ID
 767             if (is_numeric($this->arg('id'))) {
 768                 return User::staticGet($this->arg('id'));
 769             } else if ($this->arg('id')) {
 770                 $nickname = common_canonical_nickname($this->arg('id'));
 771                 return User::staticGet('nickname', $nickname);
 772             } else if ($this->arg('user_id')) {
 773                 // This is to ensure that a non-numeric user_id still
 774                 // overrides screen_name even if it doesn't get used
 775                 if (is_numeric($this->arg('user_id'))) {
 776                     return User::staticGet('id', $this->arg('user_id'));
 777                 }
 778             } else if ($this->arg('screen_name')) {
 779                 $nickname = common_canonical_nickname($this->arg('screen_name'));
 780                 return User::staticGet('nickname', $nickname);
 781             } else {
 782                 // Fall back to trying the currently authenticated user
 783                 return $apidata['user'];
 784             }
 785
 786         } else if (is_numeric($id)) {
 787             return User::staticGet($id);
 788         } else {
 789             $nickname = common_canonical_nickname($id);
 790             return User::staticGet('nickname', $nickname);
 791         }
 792     }
 793
 794     function get_group($id, $apidata=null)
 795     {
 796         if (empty($id)) {
 797
 798             if (is_numeric($this->arg('id'))) {
 799                 return User_group::staticGet($this->arg('id'));
 800             } else if ($this->arg('id')) {
 801                 $nickname = common_canonical_nickname($this->arg('id'));
 802                 return User_group::staticGet('nickname', $nickname);
 803             } else if ($this->arg('group_id')) {
 804                 // This is to ensure that a non-numeric user_id still
 805                 // overrides screen_name even if it doesn't get used
 806                 if (is_numeric($this->arg('group_id'))) {
 807                     return User_group::staticGet('id', $this->arg('group_id'));
 808                 }
 809             } else if ($this->arg('group_name')) {
 810                 $nickname = common_canonical_nickname($this->arg('group_name'));
 811                 return User_group::staticGet('nickname', $nickname);
 812             }
 813
 814         } else if (is_numeric($id)) {
 815             return User_group::staticGet($id);
 816         } else {
 817             $nickname = common_canonical_nickname($id);
 818             return User_group::staticGet('nickname', $nickname);
 819         }
 820     }
 821
 822     function get_profile($id)
 823     {
 824         if (is_numeric($id)) {
 825             return Profile::staticGet($id);
 826         } else {
 827             $user = User::staticGet('nickname', $id);
 828             if ($user) {
 829                 return $user->getProfile();
 830             } else {
 831                 return null;
 832             }
 833         }
 834     }
 835
 836     function source_link($source)
 837     {
 838         $source_name = _($source);
 839         switch ($source) {
 840         case 'web':
 841         case 'xmpp':
 842         case 'mail':
 843         case 'omb':
 844         case 'api':
 845             break;
 846         default:
 847             $ns = Notice_source::staticGet($source);
 848             if ($ns) {
 849                 $source_name = '<a href="' . $ns->url . '">' . $ns->name . '</a>';
 850             }
 851             break;
 852         }
 853         return $source_name;
 854     }
 855
 856     /**
 857      * Returns query argument or default value if not found. Certain
 858      * parameters used throughout the API are lightly scrubbed and
 859      * bounds checked.  This overrides Action::arg().
 860      *
 861      * @param string $key requested argument
 862      * @param string $def default value to return if $key is not provided
 863      *
 864      * @return var $var
 865      */
 866     function arg($key, $def=null)
 867     {
 868
 869         // XXX: Do even more input validation/scrubbing?
 870
 871         if (array_key_exists($key, $this->args)) {
 872             switch($key) {
 873             case 'page':
 874                 $page = (int)$this->args['page'];
 875                 return ($page < 1) ? 1 : $page;
 876             case 'count':
 877                 $count = (int)$this->args['count'];
 878                 if ($count < 1) {
 879                     return 20;
 880                 } elseif ($count > 200) {
 881                     return 200;
 882                 } else {
 883                     return $count;
 884                 }
 885             case 'since_id':
 886                 $since_id = (int)$this->args['since_id'];
 887                 return ($since_id < 1) ? 0 : $since_id;
 888             case 'max_id':
 889                 $max_id = (int)$this->args['max_id'];
 890                 return ($max_id < 1) ? 0 : $max_id;
 891             case 'since':
 892                 return strtotime($this->args['since']);
 893             default:
 894                 return parent::arg($key, $def);
 895             }
 896         } else {
 897             return $def;
 898         }
 899     }
 900
 901 }