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