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             $twitter_status['favorited'] = false;
 187         }
 188
 189         if ($include_user) {
 190             # Don't get notice (recursive!)
 191             $twitter_user = $this->twitter_user_array($profile, false);
 192             $twitter_status['user'] = $twitter_user;
 193         }
 194
 195         return $twitter_status;
 196     }
 197
 198     function twitter_rss_entry_array($notice)
 199     {
 200         $profile = $notice->getProfile();
 201         $entry = array();
 202
 203         # We trim() to avoid extraneous whitespace in the output
 204
 205         $entry['content'] = common_xml_safe_str(trim($notice->rendered));
 206         $entry['title'] = $profile->nickname . ': ' . common_xml_safe_str(trim($notice->content));
 207         $entry['link'] = common_local_url('shownotice', array('notice' => $notice->id));
 208         $entry['published'] = common_date_iso8601($notice->created);
 209
 210         $taguribase = common_config('integration', 'taguri');
 211         $entry['id'] = "tag:$taguribase:$entry[link]";
 212
 213         $entry['updated'] = $entry['published'];
 214         $entry['author'] = $profile->getBestName();
 215
 216         # Enclosure
 217         $attachments = $notice->attachments();
 218         if($attachments){
 219             $entry['enclosures']=array();
 220             foreach($attachments as $attachment){
 221                 $enclosure=array();
 222                 $enclosure['url']=$attachment->url;
 223                 $enclosure['mimetype']=$attachment->mimetype;
 224                 $enclosure['size']=$attachment->size;
 225                 $entry['enclosures'][]=$enclosure;
 226             }
 227         }
 228
 229         # RSS Item specific
 230         $entry['description'] = $entry['content'];
 231         $entry['pubDate'] = common_date_rfc2822($notice->created);
 232         $entry['guid'] = $entry['link'];
 233
 234         return $entry;
 235     }
 236
 237     function twitter_rss_dmsg_array($message)
 238     {
 239
 240         $entry = array();
 241
 242         $entry['title'] = sprintf('Message from %s to %s',
 243             $message->getFrom()->nickname, $message->getTo()->nickname);
 244
 245         $entry['content'] = common_xml_safe_str(trim($message->content));
 246         $entry['link'] = common_local_url('showmessage', array('message' => $message->id));
 247         $entry['published'] = common_date_iso8601($message->created);
 248
 249         $taguribase = common_config('integration', 'taguri');
 250
 251         $entry['id'] = "tag:$taguribase,:$entry[link]";
 252         $entry['updated'] = $entry['published'];
 253         $entry['author'] = $message->getFrom()->getBestName();
 254
 255         # RSS Item specific
 256         $entry['description'] = $entry['content'];
 257         $entry['pubDate'] = common_date_rfc2822($message->created);
 258         $entry['guid'] = $entry['link'];
 259
 260         return $entry;
 261     }
 262
 263     function twitter_dmsg_array($message)
 264     {
 265         $twitter_dm = array();
 266
 267         $from_profile = $message->getFrom();
 268         $to_profile = $message->getTo();
 269
 270         $twitter_dm['id'] = $message->id;
 271         $twitter_dm['sender_id'] = $message->from_profile;
 272         $twitter_dm['text'] = trim($message->content);
 273         $twitter_dm['recipient_id'] = $message->to_profile;
 274         $twitter_dm['created_at'] = $this->date_twitter($message->created);
 275         $twitter_dm['sender_screen_name'] = $from_profile->nickname;
 276         $twitter_dm['recipient_screen_name'] = $to_profile->nickname;
 277         $twitter_dm['sender'] = $this->twitter_user_array($from_profile, false);
 278         $twitter_dm['recipient'] = $this->twitter_user_array($to_profile, false);
 279
 280         return $twitter_dm;
 281     }
 282
 283     function twitter_relationship_array($source, $target)
 284     {
 285         $relationship = array();
 286
 287         $relationship['source'] =
 288             $this->relationship_details_array($source, $target);
 289         $relationship['target'] =
 290             $this->relationship_details_array($target, $source);
 291
 292         return array('relationship' => $relationship);
 293     }
 294
 295     function relationship_details_array($source, $target)
 296     {
 297         $details = array();
 298
 299         $details['screen_name'] = $source->nickname;
 300         $details['followed_by'] = $target->isSubscribed($source);
 301         $details['following'] = $source->isSubscribed($target);
 302
 303         $notifications = false;
 304
 305         if ($source->isSubscribed($target)) {
 306
 307             $sub = Subscription::pkeyGet(array('subscriber' =>
 308                 $source->id, 'subscribed' => $target->id));
 309
 310             if (!empty($sub)) {
 311                 $notifications = ($sub->jabber || $sub->sms);
 312             }
 313         }
 314
 315         $details['notifications_enabled'] = $notifications;
 316         $details['blocking'] = $source->hasBlocked($target);
 317         $details['id'] = $source->id;
 318
 319         return $details;
 320     }
 321
 322     function show_twitter_xml_relationship($relationship)
 323     {
 324         $this->elementStart('relationship');
 325
 326         foreach($relationship as $element => $value) {
 327             if ($element == 'source' || $element == 'target') {
 328                 $this->elementStart($element);
 329                 $this->show_xml_relationship_details($value);
 330                 $this->elementEnd($element);
 331             }
 332         }
 333
 334         $this->elementEnd('relationship');
 335     }
 336
 337     function show_xml_relationship_details($details)
 338     {
 339         foreach($details as $element => $value) {
 340             $this->element($element, null, $value);
 341         }
 342     }
 343
 344     function show_twitter_xml_status($twitter_status)
 345     {
 346         $this->elementStart('status');
 347         foreach($twitter_status as $element => $value) {
 348             switch ($element) {
 349             case 'user':
 350                 $this->show_twitter_xml_user($twitter_status['user']);
 351                 break;
 352             case 'text':
 353                 $this->element($element, null, common_xml_safe_str($value));
 354                 break;
 355             default:
 356                 $this->element($element, null, $value);
 357             }
 358         }
 359         $this->elementEnd('status');
 360     }
 361
 362     function show_twitter_xml_user($twitter_user, $role='user')
 363     {
 364         $this->elementStart($role);
 365         foreach($twitter_user as $element => $value) {
 366             if ($element == 'status') {
 367                 $this->show_twitter_xml_status($twitter_user['status']);
 368             } else {
 369                 $this->element($element, null, $value);
 370             }
 371         }
 372         $this->elementEnd($role);
 373     }
 374
 375     function show_twitter_rss_item($entry)
 376     {
 377         $this->elementStart('item');
 378         $this->element('title', null, $entry['title']);
 379         $this->element('description', null, $entry['description']);
 380         $this->element('pubDate', null, $entry['pubDate']);
 381         $this->element('guid', null, $entry['guid']);
 382         $this->element('link', null, $entry['link']);
 383
 384         # RSS only supports 1 enclosure per item
 385         if($entry['enclosures']){
 386             $enclosure = $entry['enclosures'][0];
 387             $this->element('enclosure', array('url'=>$enclosure['url'],'type'=>$enclosure['mimetype'],'length'=>$enclosure['size']), null);
 388         }
 389
 390         $this->elementEnd('item');
 391     }
 392
 393     function show_json_objects($objects)
 394     {
 395         print(json_encode($objects));
 396     }
 397
 398     function show_single_xml_status($notice)
 399     {
 400         $this->init_document('xml');
 401         $twitter_status = $this->twitter_status_array($notice);
 402         $this->show_twitter_xml_status($twitter_status);
 403         $this->end_document('xml');
 404     }
 405
 406     function show_single_json_status($notice)
 407     {
 408         $this->init_document('json');
 409         $status = $this->twitter_status_array($notice);
 410         $this->show_json_objects($status);
 411         $this->end_document('json');
 412     }
 413
 414     function show_single_xml_dmsg($message)
 415     {
 416         $this->init_document('xml');
 417         $dmsg = $this->twitter_dmsg_array($message);
 418         $this->show_twitter_xml_dmsg($dmsg);
 419         $this->end_document('xml');
 420     }
 421
 422     function show_single_json_dmsg($message)
 423     {
 424         $this->init_document('json');
 425         $dmsg = $this->twitter_dmsg_array($message);
 426         $this->show_json_objects($dmsg);
 427         $this->end_document('json');
 428     }
 429
 430     function show_twitter_xml_dmsg($twitter_dm)
 431     {
 432         $this->elementStart('direct_message');
 433         foreach($twitter_dm as $element => $value) {
 434             switch ($element) {
 435             case 'sender':
 436             case 'recipient':
 437                 $this->show_twitter_xml_user($value, $element);
 438                 break;
 439             case 'text':
 440                 $this->element($element, null, common_xml_safe_str($value));
 441                 break;
 442             default:
 443                 $this->element($element, null, $value);
 444             }
 445         }
 446         $this->elementEnd('direct_message');
 447     }
 448
 449     function show_xml_timeline($notice)
 450     {
 451
 452         $this->init_document('xml');
 453         $this->elementStart('statuses', array('type' => 'array'));
 454
 455         if (is_array($notice)) {
 456             foreach ($notice as $n) {
 457                 $twitter_status = $this->twitter_status_array($n);
 458                 $this->show_twitter_xml_status($twitter_status);
 459             }
 460         } else {
 461             while ($notice->fetch()) {
 462                 $twitter_status = $this->twitter_status_array($notice);
 463                 $this->show_twitter_xml_status($twitter_status);
 464             }
 465         }
 466
 467         $this->elementEnd('statuses');
 468         $this->end_document('xml');
 469     }
 470
 471     function show_rss_timeline($notice, $title, $link, $subtitle, $suplink=null)
 472     {
 473
 474         $this->init_document('rss');
 475
 476         $this->elementStart('channel');
 477         $this->element('title', null, $title);
 478         $this->element('link', null, $link);
 479         if (!is_null($suplink)) {
 480             # For FriendFeed's SUP protocol
 481             $this->element('link', array('xmlns' => 'http://www.w3.org/2005/Atom',
 482                                          'rel' => 'http://api.friendfeed.com/2008/03#sup',
 483                                          'href' => $suplink,
 484                                          'type' => 'application/json'));
 485         }
 486         $this->element('description', null, $subtitle);
 487         $this->element('language', null, 'en-us');
 488         $this->element('ttl', null, '40');
 489
 490         if (is_array($notice)) {
 491             foreach ($notice as $n) {
 492                 $entry = $this->twitter_rss_entry_array($n);
 493                 $this->show_twitter_rss_item($entry);
 494             }
 495         } else {
 496             while ($notice->fetch()) {
 497                 $entry = $this->twitter_rss_entry_array($notice);
 498                 $this->show_twitter_rss_item($entry);
 499             }
 500         }
 501
 502         $this->elementEnd('channel');
 503         $this->end_twitter_rss();
 504     }
 505
 506     function show_atom_timeline($notice, $title, $id, $link, $subtitle=null, $suplink=null, $selfuri=null)
 507     {
 508
 509         $this->init_document('atom');
 510
 511         $this->element('title', null, $title);
 512         $this->element('id', null, $id);
 513         $this->element('link', array('href' => $link, 'rel' => 'alternate', 'type' => 'text/html'), null);
 514
 515         if (!is_null($suplink)) {
 516             # For FriendFeed's SUP protocol
 517             $this->element('link', array('rel' => 'http://api.friendfeed.com/2008/03#sup',
 518                                          'href' => $suplink,
 519                                          'type' => 'application/json'));
 520         }
 521
 522         if (!is_null($selfuri)) {
 523             $this->element('link', array('href' => $selfuri,
 524                 'rel' => 'self', 'type' => 'application/atom+xml'), null);
 525         }
 526
 527         $this->element('updated', null, common_date_iso8601('now'));
 528         $this->element('subtitle', null, $subtitle);
 529
 530         if (is_array($notice)) {
 531             foreach ($notice as $n) {
 532                 $this->raw($n->asAtomEntry());
 533             }
 534         } else {
 535             while ($notice->fetch()) {
 536                 $this->raw($notice->asAtomEntry());
 537             }
 538         }
 539
 540         $this->end_document('atom');
 541
 542     }
 543
 544     function show_json_timeline($notice)
 545     {
 546
 547         $this->init_document('json');
 548
 549         $statuses = array();
 550
 551         if (is_array($notice)) {
 552             foreach ($notice as $n) {
 553                 $twitter_status = $this->twitter_status_array($n);
 554                 array_push($statuses, $twitter_status);
 555             }
 556         } else {
 557             while ($notice->fetch()) {
 558                 $twitter_status = $this->twitter_status_array($notice);
 559                 array_push($statuses, $twitter_status);
 560             }
 561         }
 562
 563         $this->show_json_objects($statuses);
 564
 565         $this->end_document('json');
 566     }
 567
 568     // Anyone know what date format this is?
 569     // Twitter's dates look like this: "Mon Jul 14 23:52:38 +0000 2008" -- Zach
 570     function date_twitter($dt)
 571     {
 572         $t = strtotime($dt);
 573         return date("D M d H:i:s O Y", $t);
 574     }
 575
 576     // XXX: Candidate for a general utility method somewhere?
 577     function count_subscriptions($profile)
 578     {
 579
 580         $count = 0;
 581         $sub = new Subscription();
 582         $sub->subscribed = $profile->id;
 583
 584         $count = $sub->find();
 585
 586         if ($count > 0) {
 587             return $count - 1;
 588         } else {
 589             return 0;
 590         }
 591     }
 592
 593     function init_document($type='xml')
 594     {
 595         switch ($type) {
 596         case 'xml':
 597             header('Content-Type: application/xml; charset=utf-8');
 598             $this->startXML();
 599             break;
 600         case 'json':
 601             header('Content-Type: application/json; charset=utf-8');
 602
 603             // Check for JSONP callback
 604             $callback = $this->arg('callback');
 605             if ($callback) {
 606                 print $callback . '(';
 607             }
 608             break;
 609         case 'rss':
 610             header("Content-Type: application/rss+xml; charset=utf-8");
 611             $this->init_twitter_rss();
 612             break;
 613         case 'atom':
 614             header('Content-Type: application/atom+xml; charset=utf-8');
 615             $this->init_twitter_atom();
 616             break;
 617         default:
 618             $this->clientError(_('Not a supported data format.'));
 619             break;
 620         }
 621
 622         return;
 623     }
 624
 625     function end_document($type='xml')
 626     {
 627         switch ($type) {
 628         case 'xml':
 629             $this->endXML();
 630             break;
 631         case 'json':
 632
 633             // Check for JSONP callback
 634             $callback = $this->arg('callback');
 635             if ($callback) {
 636                 print ')';
 637             }
 638             break;
 639         case 'rss':
 640             $this->end_twitter_rss();
 641             break;
 642         case 'atom':
 643             $this->end_twitter_rss();
 644             break;
 645         default:
 646             $this->clientError(_('Not a supported data format.'));
 647             break;
 648         }
 649         return;
 650     }
 651
 652     function clientError($msg, $code = 400, $content_type = 'json')
 653     {
 654
 655         static $status = array(400 => 'Bad Request',
 656                                401 => 'Unauthorized',
 657                                402 => 'Payment Required',
 658                                403 => 'Forbidden',
 659                                404 => 'Not Found',
 660                                405 => 'Method Not Allowed',
 661                                406 => 'Not Acceptable',
 662                                407 => 'Proxy Authentication Required',
 663                                408 => 'Request Timeout',
 664                                409 => 'Conflict',
 665                                410 => 'Gone',
 666                                411 => 'Length Required',
 667                                412 => 'Precondition Failed',
 668                                413 => 'Request Entity Too Large',
 669                                414 => 'Request-URI Too Long',
 670                                415 => 'Unsupported Media Type',
 671                                416 => 'Requested Range Not Satisfiable',
 672                                417 => 'Expectation Failed');
 673
 674         $action = $this->trimmed('action');
 675
 676         common_debug("User error '$code' on '$action': $msg", __FILE__);
 677
 678         if (!array_key_exists($code, $status)) {
 679             $code = 400;
 680         }
 681
 682         $status_string = $status[$code];
 683         header('HTTP/1.1 '.$code.' '.$status_string);
 684
 685         if ($content_type == 'xml') {
 686             $this->init_document('xml');
 687             $this->elementStart('hash');
 688             $this->element('error', null, $msg);
 689             $this->element('request', null, $_SERVER['REQUEST_URI']);
 690             $this->elementEnd('hash');
 691             $this->end_document('xml');
 692         } else {
 693             $this->init_document('json');
 694             $error_array = array('error' => $msg, 'request' => $_SERVER['REQUEST_URI']);
 695             print(json_encode($error_array));
 696             $this->end_document('json');
 697         }
 698
 699     }
 700
 701     function init_twitter_rss()
 702     {
 703         $this->startXML();
 704         $this->elementStart('rss', array('version' => '2.0'));
 705     }
 706
 707     function end_twitter_rss()
 708     {
 709         $this->elementEnd('rss');
 710         $this->endXML();
 711     }
 712
 713     function init_twitter_atom()
 714     {
 715         $this->startXML();
 716         // FIXME: don't hardcode the language here!
 717         $this->elementStart('feed', array('xmlns' => 'http://www.w3.org/2005/Atom',
 718                                           'xml:lang' => 'en-US',
 719                                           'xmlns:thr' => 'http://purl.org/syndication/thread/1.0'));
 720     }
 721
 722     function end_twitter_atom()
 723     {
 724         $this->elementEnd('feed');
 725         $this->endXML();
 726     }
 727
 728     function show_profile($profile, $content_type='xml', $notice=null)
 729     {
 730         $profile_array = $this->twitter_user_array($profile, true);
 731         switch ($content_type) {
 732         case 'xml':
 733             $this->show_twitter_xml_user($profile_array);
 734             break;
 735         case 'json':
 736             $this->show_json_objects($profile_array);
 737             break;
 738         default:
 739             $this->clientError(_('Not a supported data format.'));
 740             return;
 741         }
 742         return;
 743     }
 744
 745     function get_user($id, $apidata=null)
 746     {
 747         if (empty($id)) {
 748
 749             // Twitter supports these other ways of passing the user ID
 750             if (is_numeric($this->arg('id'))) {
 751                 return User::staticGet($this->arg('id'));
 752             } else if ($this->arg('id')) {
 753                 $nickname = common_canonical_nickname($this->arg('id'));
 754                 return User::staticGet('nickname', $nickname);
 755             } else if ($this->arg('user_id')) {
 756                 // This is to ensure that a non-numeric user_id still
 757                 // overrides screen_name even if it doesn't get used
 758                 if (is_numeric($this->arg('user_id'))) {
 759                     return User::staticGet('id', $this->arg('user_id'));
 760                 }
 761             } else if ($this->arg('screen_name')) {
 762                 $nickname = common_canonical_nickname($this->arg('screen_name'));
 763                 return User::staticGet('nickname', $nickname);
 764             } else {
 765                 // Fall back to trying the currently authenticated user
 766                 return $apidata['user'];
 767             }
 768
 769         } else if (is_numeric($id)) {
 770             return User::staticGet($id);
 771         } else {
 772             $nickname = common_canonical_nickname($id);
 773             return User::staticGet('nickname', $nickname);
 774         }
 775     }
 776
 777     function get_group($id, $apidata=null)
 778     {
 779         if (empty($id)) {
 780
 781             if (is_numeric($this->arg('id'))) {
 782                 return User_group::staticGet($this->arg('id'));
 783             } else if ($this->arg('id')) {
 784                 $nickname = common_canonical_nickname($this->arg('id'));
 785                 return User_group::staticGet('nickname', $nickname);
 786             } else if ($this->arg('group_id')) {
 787                 // This is to ensure that a non-numeric user_id still
 788                 // overrides screen_name even if it doesn't get used
 789                 if (is_numeric($this->arg('group_id'))) {
 790                     return User_group::staticGet('id', $this->arg('group_id'));
 791                 }
 792             } else if ($this->arg('group_name')) {
 793                 $nickname = common_canonical_nickname($this->arg('group_name'));
 794                 return User_group::staticGet('nickname', $nickname);
 795             }
 796
 797         } else if (is_numeric($id)) {
 798             return User_group::staticGet($id);
 799         } else {
 800             $nickname = common_canonical_nickname($id);
 801             return User_group::staticGet('nickname', $nickname);
 802         }
 803     }
 804
 805     function get_profile($id)
 806     {
 807         if (is_numeric($id)) {
 808             return Profile::staticGet($id);
 809         } else {
 810             $user = User::staticGet('nickname', $id);
 811             if ($user) {
 812                 return $user->getProfile();
 813             } else {
 814                 return null;
 815             }
 816         }
 817     }
 818
 819     function source_link($source)
 820     {
 821         $source_name = _($source);
 822         switch ($source) {
 823         case 'web':
 824         case 'xmpp':
 825         case 'mail':
 826         case 'omb':
 827         case 'api':
 828             break;
 829         default:
 830             $ns = Notice_source::staticGet($source);
 831             if ($ns) {
 832                 $source_name = '<a href="' . $ns->url . '">' . $ns->name . '</a>';
 833             }
 834             break;
 835         }
 836         return $source_name;
 837     }
 838
 839     /**
 840      * Returns query argument or default value if not found. Certain
 841      * parameters used throughout the API are lightly scrubbed and
 842      * bounds checked.  This overrides Action::arg().
 843      *
 844      * @param string $key requested argument
 845      * @param string $def default value to return if $key is not provided
 846      *
 847      * @return var $var
 848      */
 849     function arg($key, $def=null)
 850     {
 851
 852         // XXX: Do even more input validation/scrubbing?
 853
 854         if (array_key_exists($key, $this->args)) {
 855             switch($key) {
 856             case 'page':
 857                 $page = (int)$this->args['page'];
 858                 return ($page < 1) ? 1 : $page;
 859             case 'count':
 860                 $count = (int)$this->args['count'];
 861                 if ($count < 1) {
 862                     return 20;
 863                 } elseif ($count > 200) {
 864                     return 200;
 865                 } else {
 866                     return $count;
 867                 }
 868             case 'since_id':
 869                 $since_id = (int)$this->args['since_id'];
 870                 return ($since_id < 1) ? 0 : $since_id;
 871             case 'max_id':
 872                 $max_id = (int)$this->args['max_id'];
 873                 return ($max_id < 1) ? 0 : $max_id;
 874             case 'since':
 875                 return strtotime($this->args['since']);
 876             default:
 877                 return parent::arg($key, $def);
 878             }
 879         } else {
 880             return $def;
 881         }
 882     }
 883
 884 }