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 $twitter_dm;
 279     }
 280
 281     function show_twitter_xml_status($twitter_status)
 282     {
 283         $this->elementStart('status');
 284         foreach($twitter_status as $element => $value) {
 285             switch ($element) {
 286             case 'user':
 287                 $this->show_twitter_xml_user($twitter_status['user']);
 288                 break;
 289             case 'text':
 290                 $this->element($element, null, common_xml_safe_str($value));
 291                 break;
 292             default:
 293                 $this->element($element, null, $value);
 294             }
 295         }
 296         $this->elementEnd('status');
 297     }
 298
 299     function show_twitter_xml_user($twitter_user, $role='user')
 300     {
 301         $this->elementStart($role);
 302         foreach($twitter_user as $element => $value) {
 303             if ($element == 'status') {
 304                 $this->show_twitter_xml_status($twitter_user['status']);
 305             } else {
 306                 $this->element($element, null, $value);
 307             }
 308         }
 309         $this->elementEnd($role);
 310     }
 311
 312     function show_twitter_rss_item($entry)
 313     {
 314         $this->elementStart('item');
 315         $this->element('title', null, $entry['title']);
 316         $this->element('description', null, $entry['description']);
 317         $this->element('pubDate', null, $entry['pubDate']);
 318         $this->element('guid', null, $entry['guid']);
 319         $this->element('link', null, $entry['link']);
 320         $this->elementEnd('item');
 321     }
 322
 323     function show_json_objects($objects)
 324     {
 325         print(json_encode($objects));
 326     }
 327
 328     function show_single_xml_status($notice)
 329     {
 330         $this->init_document('xml');
 331         $twitter_status = $this->twitter_status_array($notice);
 332         $this->show_twitter_xml_status($twitter_status);
 333         $this->end_document('xml');
 334     }
 335
 336     function show_single_json_status($notice)
 337     {
 338         $this->init_document('json');
 339         $status = $this->twitter_status_array($notice);
 340         $this->show_json_objects($status);
 341         $this->end_document('json');
 342     }
 343
 344     function show_single_xml_dmsg($message)
 345     {
 346         $this->init_document('xml');
 347         $dmsg = $this->twitter_dmsg_array($message);
 348         $this->show_twitter_xml_dmsg($dmsg);
 349         $this->end_document('xml');
 350     }
 351
 352     function show_single_json_dmsg($message)
 353     {
 354         $this->init_document('json');
 355         $dmsg = $this->twitter_dmsg_array($message);
 356         $this->show_json_objects($dmsg);
 357         $this->end_document('json');
 358     }
 359
 360     function show_twitter_xml_dmsg($twitter_dm)
 361     {
 362         $this->elementStart('direct_message');
 363         foreach($twitter_dm as $element => $value) {
 364             switch ($element) {
 365             case 'sender':
 366             case 'recipient':
 367                 $this->show_twitter_xml_user($value, $element);
 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         $this->elementEnd('direct_message');
 377     }
 378
 379     function show_xml_timeline($notice)
 380     {
 381
 382         $this->init_document('xml');
 383         $this->elementStart('statuses', array('type' => 'array'));
 384
 385         if (is_array($notice)) {
 386             foreach ($notice as $n) {
 387                 $twitter_status = $this->twitter_status_array($n);
 388                 $this->show_twitter_xml_status($twitter_status);
 389             }
 390         } else {
 391             while ($notice->fetch()) {
 392                 $twitter_status = $this->twitter_status_array($notice);
 393                 $this->show_twitter_xml_status($twitter_status);
 394             }
 395         }
 396
 397         $this->elementEnd('statuses');
 398         $this->end_document('xml');
 399     }
 400
 401     function show_rss_timeline($notice, $title, $link, $subtitle, $suplink=null)
 402     {
 403
 404         $this->init_document('rss');
 405
 406         $this->elementStart('channel');
 407         $this->element('title', null, $title);
 408         $this->element('link', null, $link);
 409         if (!is_null($suplink)) {
 410             # For FriendFeed's SUP protocol
 411             $this->element('link', array('xmlns' => 'http://www.w3.org/2005/Atom',
 412                                          'rel' => 'http://api.friendfeed.com/2008/03#sup',
 413                                          'href' => $suplink,
 414                                          'type' => 'application/json'));
 415         }
 416         $this->element('description', null, $subtitle);
 417         $this->element('language', null, 'en-us');
 418         $this->element('ttl', null, '40');
 419
 420         if (is_array($notice)) {
 421             foreach ($notice as $n) {
 422                 $entry = $this->twitter_rss_entry_array($n);
 423                 $this->show_twitter_rss_item($entry);
 424             }
 425         } else {
 426             while ($notice->fetch()) {
 427                 $entry = $this->twitter_rss_entry_array($notice);
 428                 $this->show_twitter_rss_item($entry);
 429             }
 430         }
 431
 432         $this->elementEnd('channel');
 433         $this->end_twitter_rss();
 434     }
 435
 436     function show_atom_timeline($notice, $title, $id, $link, $subtitle=null, $suplink=null, $selfuri=null)
 437     {
 438
 439         $this->init_document('atom');
 440
 441         $this->element('title', null, $title);
 442         $this->element('id', null, $id);
 443         $this->element('link', array('href' => $link, 'rel' => 'alternate', 'type' => 'text/html'), null);
 444
 445         if (!is_null($suplink)) {
 446             # For FriendFeed's SUP protocol
 447             $this->element('link', array('rel' => 'http://api.friendfeed.com/2008/03#sup',
 448                                          'href' => $suplink,
 449                                          'type' => 'application/json'));
 450         }
 451
 452         if (!is_null($selfuri)) {
 453             $this->element('link', array('href' => $selfuri,
 454                 'rel' => 'self', 'type' => 'application/atom+xml'), null);
 455         }
 456
 457         $this->element('updated', null, common_date_iso8601('now'));
 458         $this->element('subtitle', null, $subtitle);
 459
 460         if (is_array($notice)) {
 461             foreach ($notice as $n) {
 462                 $this->raw($n->asAtomEntry());
 463             }
 464         } else {
 465             while ($notice->fetch()) {
 466                 $this->raw($notice->asAtomEntry());
 467             }
 468         }
 469
 470         $this->end_document('atom');
 471
 472     }
 473
 474     function show_json_timeline($notice)
 475     {
 476
 477         $this->init_document('json');
 478
 479         $statuses = array();
 480
 481         if (is_array($notice)) {
 482             foreach ($notice as $n) {
 483                 $twitter_status = $this->twitter_status_array($n);
 484                 array_push($statuses, $twitter_status);
 485             }
 486         } else {
 487             while ($notice->fetch()) {
 488                 $twitter_status = $this->twitter_status_array($notice);
 489                 array_push($statuses, $twitter_status);
 490             }
 491         }
 492
 493         $this->show_json_objects($statuses);
 494
 495         $this->end_document('json');
 496     }
 497
 498     // Anyone know what date format this is?
 499     // Twitter's dates look like this: "Mon Jul 14 23:52:38 +0000 2008" -- Zach
 500     function date_twitter($dt)
 501     {
 502         $t = strtotime($dt);
 503         return date("D M d H:i:s O Y", $t);
 504     }
 505
 506     // XXX: Candidate for a general utility method somewhere?
 507     function count_subscriptions($profile)
 508     {
 509
 510         $count = 0;
 511         $sub = new Subscription();
 512         $sub->subscribed = $profile->id;
 513
 514         $count = $sub->find();
 515
 516         if ($count > 0) {
 517             return $count - 1;
 518         } else {
 519             return 0;
 520         }
 521     }
 522
 523     function init_document($type='xml')
 524     {
 525         switch ($type) {
 526         case 'xml':
 527             header('Content-Type: application/xml; charset=utf-8');
 528             $this->startXML();
 529             break;
 530         case 'json':
 531             header('Content-Type: application/json; charset=utf-8');
 532
 533             // Check for JSONP callback
 534             $callback = $this->arg('callback');
 535             if ($callback) {
 536                 print $callback . '(';
 537             }
 538             break;
 539         case 'rss':
 540             header("Content-Type: application/rss+xml; charset=utf-8");
 541             $this->init_twitter_rss();
 542             break;
 543         case 'atom':
 544             header('Content-Type: application/atom+xml; charset=utf-8');
 545             $this->init_twitter_atom();
 546             break;
 547         default:
 548             $this->clientError(_('Not a supported data format.'));
 549             break;
 550         }
 551
 552         return;
 553     }
 554
 555     function end_document($type='xml')
 556     {
 557         switch ($type) {
 558         case 'xml':
 559             $this->endXML();
 560             break;
 561         case 'json':
 562
 563             // Check for JSONP callback
 564             $callback = $this->arg('callback');
 565             if ($callback) {
 566                 print ')';
 567             }
 568             break;
 569         case 'rss':
 570             $this->end_twitter_rss();
 571             break;
 572         case 'atom':
 573             $this->end_twitter_rss();
 574             break;
 575         default:
 576             $this->clientError(_('Not a supported data format.'));
 577             break;
 578         }
 579         return;
 580     }
 581
 582     function clientError($msg, $code = 400, $content_type = 'json')
 583     {
 584
 585         static $status = array(400 => 'Bad Request',
 586                                401 => 'Unauthorized',
 587                                402 => 'Payment Required',
 588                                403 => 'Forbidden',
 589                                404 => 'Not Found',
 590                                405 => 'Method Not Allowed',
 591                                406 => 'Not Acceptable',
 592                                407 => 'Proxy Authentication Required',
 593                                408 => 'Request Timeout',
 594                                409 => 'Conflict',
 595                                410 => 'Gone',
 596                                411 => 'Length Required',
 597                                412 => 'Precondition Failed',
 598                                413 => 'Request Entity Too Large',
 599                                414 => 'Request-URI Too Long',
 600                                415 => 'Unsupported Media Type',
 601                                416 => 'Requested Range Not Satisfiable',
 602                                417 => 'Expectation Failed');
 603
 604         $action = $this->trimmed('action');
 605
 606         common_debug("User error '$code' on '$action': $msg", __FILE__);
 607
 608         if (!array_key_exists($code, $status)) {
 609             $code = 400;
 610         }
 611
 612         $status_string = $status[$code];
 613         header('HTTP/1.1 '.$code.' '.$status_string);
 614
 615         if ($content_type == 'xml') {
 616             $this->init_document('xml');
 617             $this->elementStart('hash');
 618             $this->element('error', null, $msg);
 619             $this->element('request', null, $_SERVER['REQUEST_URI']);
 620             $this->elementEnd('hash');
 621             $this->end_document('xml');
 622         } else {
 623             $this->init_document('json');
 624             $error_array = array('error' => $msg, 'request' => $_SERVER['REQUEST_URI']);
 625             print(json_encode($error_array));
 626             $this->end_document('json');
 627         }
 628
 629     }
 630
 631     function init_twitter_rss()
 632     {
 633         $this->startXML();
 634         $this->elementStart('rss', array('version' => '2.0'));
 635     }
 636
 637     function end_twitter_rss()
 638     {
 639         $this->elementEnd('rss');
 640         $this->endXML();
 641     }
 642
 643     function init_twitter_atom()
 644     {
 645         $this->startXML();
 646         // FIXME: don't hardcode the language here!
 647         $this->elementStart('feed', array('xmlns' => 'http://www.w3.org/2005/Atom',
 648                                           'xml:lang' => 'en-US',
 649                                           'xmlns:thr' => 'http://purl.org/syndication/thread/1.0'));
 650     }
 651
 652     function end_twitter_atom()
 653     {
 654         $this->elementEnd('feed');
 655         $this->endXML();
 656     }
 657
 658     function show_profile($profile, $content_type='xml', $notice=null)
 659     {
 660         $profile_array = $this->twitter_user_array($profile, true);
 661         switch ($content_type) {
 662         case 'xml':
 663             $this->show_twitter_xml_user($profile_array);
 664             break;
 665         case 'json':
 666             $this->show_json_objects($profile_array);
 667             break;
 668         default:
 669             $this->clientError(_('Not a supported data format.'));
 670             return;
 671         }
 672         return;
 673     }
 674
 675     function get_user($id, $apidata=null)
 676     {
 677         if (empty($id)) {
 678
 679             // Twitter supports these other ways of passing the user ID
 680             if (is_numeric($this->arg('id'))) {
 681                 return User::staticGet($this->arg('id'));
 682             } else if ($this->arg('id')) {
 683                 $nickname = common_canonical_nickname($this->arg('id'));
 684                 return User::staticGet('nickname', $nickname);
 685             } else if ($this->arg('user_id')) {
 686                 // This is to ensure that a non-numeric user_id still
 687                 // overrides screen_name even if it doesn't get used
 688                 if (is_numeric($this->arg('user_id'))) {
 689                     return User::staticGet('id', $this->arg('user_id'));
 690                 }
 691             } else if ($this->arg('screen_name')) {
 692                 $nickname = common_canonical_nickname($this->arg('screen_name'));
 693                 return User::staticGet('nickname', $nickname);
 694             } else {
 695                 // Fall back to trying the currently authenticated user
 696                 return $apidata['user'];
 697             }
 698
 699         } else if (is_numeric($id)) {
 700             return User::staticGet($id);
 701         } else {
 702             $nickname = common_canonical_nickname($id);
 703             return User::staticGet('nickname', $nickname);
 704         }
 705     }
 706
 707     function get_profile($id)
 708     {
 709         if (is_numeric($id)) {
 710             return Profile::staticGet($id);
 711         } else {
 712             $user = User::staticGet('nickname', $id);
 713             if ($user) {
 714                 return $user->getProfile();
 715             } else {
 716                 return null;
 717             }
 718         }
 719     }
 720
 721     function source_link($source)
 722     {
 723         $source_name = _($source);
 724         switch ($source) {
 725         case 'web':
 726         case 'xmpp':
 727         case 'mail':
 728         case 'omb':
 729         case 'api':
 730             break;
 731         default:
 732             $ns = Notice_source::staticGet($source);
 733             if ($ns) {
 734                 $source_name = '<a href="' . $ns->url . '">' . $ns->name . '</a>';
 735             }
 736             break;
 737         }
 738         return $source_name;
 739     }
 740
 741     /**
 742      * Returns query argument or default value if not found. Certain
 743      * parameters used throughout the API are lightly scrubbed and
 744      * bounds checked.  This overrides Action::arg().
 745      *
 746      * @param string $key requested argument
 747      * @param string $def default value to return if $key is not provided
 748      *
 749      * @return var $var
 750      */
 751     function arg($key, $def=null)
 752     {
 753
 754         // XXX: Do even more input validation/scrubbing?
 755
 756         if (array_key_exists($key, $this->args)) {
 757             switch($key) {
 758             case 'page':
 759                 $page = (int)$this->args['page'];
 760                 return ($page < 1) ? 1 : $page;
 761             case 'count':
 762                 $count = (int)$this->args['count'];
 763                 if ($count < 1) {
 764                     return 20;
 765                 } elseif ($count > 200) {
 766                     return 200;
 767                 } else {
 768                     return $count;
 769                 }
 770             case 'since_id':
 771                 $since_id = (int)$this->args['since_id'];
 772                 return ($since_id < 1) ? 0 : $since_id;
 773             case 'max_id':
 774                 $max_id = (int)$this->args['max_id'];
 775                 return ($max_id < 1) ? 0 : $max_id;
 776             case 'since':
 777                 return strtotime($this->args['since']);
 778             default:
 779                 return parent::arg($key, $def);
 780             }
 781         } else {
 782             return $def;
 783         }
 784     }
 785
 786 }