lib/util.php

   1 <?php
   2 /*
   3  * Laconica - a distributed open-source microblogging tool
   4  * Copyright (C) 2008, Controlez-Vous, 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 /* XXX: break up into separate modules (HTTP, HTML, user, files) */
  21
  22 # Show a server error
  23
  24 function common_server_error($msg, $code=500) {
  25         static $status = array(500 => 'Internal Server Error',
  26                                                    501 => 'Not Implemented',
  27                                                    502 => 'Bad Gateway',
  28                                                    503 => 'Service Unavailable',
  29                                                    504 => 'Gateway Timeout',
  30                                                    505 => 'HTTP Version Not Supported');
  31
  32         if (!array_key_exists($code, $status)) {
  33                 $code = 500;
  34         }
  35
  36         $status_string = $status[$code];
  37
  38         header('HTTP/1.1 '.$code.' '.$status_string);
  39         header('Content-type: text/plain');
  40
  41         print $msg;
  42         print "\n";
  43         exit();
  44 }
  45
  46 # Show a user error
  47 function common_user_error($msg, $code=400) {
  48         static $status = array(400 => 'Bad Request',
  49                                                    401 => 'Unauthorized',
  50                                                    402 => 'Payment Required',
  51                                                    403 => 'Forbidden',
  52                                                    404 => 'Not Found',
  53                                                    405 => 'Method Not Allowed',
  54                                                    406 => 'Not Acceptable',
  55                                                    407 => 'Proxy Authentication Required',
  56                                                    408 => 'Request Timeout',
  57                                                    409 => 'Conflict',
  58                                                    410 => 'Gone',
  59                                                    411 => 'Length Required',
  60                                                    412 => 'Precondition Failed',
  61                                                    413 => 'Request Entity Too Large',
  62                                                    414 => 'Request-URI Too Long',
  63                                                    415 => 'Unsupported Media Type',
  64                                                    416 => 'Requested Range Not Satisfiable',
  65                                                    417 => 'Expectation Failed');
  66
  67         if (!array_key_exists($code, $status)) {
  68                 $code = 400;
  69         }
  70
  71         $status_string = $status[$code];
  72
  73         header('HTTP/1.1 '.$code.' '.$status_string);
  74
  75         common_show_header('Error');
  76         common_element('div', array('class' => 'error'), $msg);
  77         common_show_footer();
  78 }
  79
  80 $xw = null;
  81
  82 # Start an HTML element
  83 function common_element_start($tag, $attrs=NULL) {
  84         global $xw;
  85         $xw->startElement($tag);
  86         if (is_array($attrs)) {
  87                 foreach ($attrs as $name => $value) {
  88                         $xw->writeAttribute($name, $value);
  89                 }
  90         } else if (is_string($attrs)) {
  91                 $xw->writeAttribute('class', $attrs);
  92         }
  93 }
  94
  95 function common_element_end($tag) {
  96         global $xw;
  97         $xw->endElement();
  98 }
  99
 100 function common_element($tag, $attrs=NULL, $content=NULL) {
 101     common_element_start($tag, $attrs);
 102         if ($content) {
 103                 global $xw;
 104                 $xw->text($content);
 105         }
 106         common_element_end($tag);
 107 }
 108
 109 function common_start_xml($doc=NULL, $public=NULL, $system=NULL) {
 110         global $xw;
 111         $xw = new XMLWriter();
 112         $xw->openURI('php://output');
 113         $xw->setIndent(true);
 114         $xw->startDocument('1.0', 'UTF-8');
 115         if ($doc) {
 116                 $xw->writeDTD($doc, $public, $system);
 117         }
 118 }
 119
 120 function common_end_xml() {
 121         global $xw;
 122         $xw->endDocument();
 123         $xw->flush();
 124 }
 125
 126 function common_show_header($pagetitle, $callable=NULL, $data=NULL, $notice=NULL) {
 127         global $config, $xw;
 128
 129         header('Content-Type: application/xhtml+xml');
 130
 131         common_start_xml('html',
 132                                          '-//W3C//DTD XHTML 1.0 Strict//EN',
 133                                          'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd');
 134
 135         # FIXME: correct language for interface
 136
 137         common_element_start('html', array('xmlns' => 'http://www.w3.org/1999/xhtml',
 138                                                                            'xml:lang' => 'en',
 139                                                                            'lang' => 'en'));
 140
 141         common_element_start('head');
 142         common_element('title', NULL,
 143                                    $pagetitle . " - " . $config['site']['name']);
 144         common_element('link', array('rel' => 'stylesheet',
 145                                                                  'type' => 'text/css',
 146                                                                  'href' => theme_path('display.css'),
 147                                                                  'media' => 'screen, projection, tv'));
 148         foreach (array(6,7) as $ver) {
 149                 if (file_exists(theme_file('ie'.$ver.'.css'))) {
 150                         # Yes, IE people should be put in jail.
 151                         $xw->writeComment('[if lte IE '.$ver.']><link rel="stylesheet" type="text/css" '.
 152                                                           'href="'.theme_path('ie'.$ver.'.css').' /><![endif]');
 153                 }
 154         }
 155         if ($callable) {
 156                 if ($data) {
 157                         call_user_func($callable, $data);
 158                 } else {
 159                         call_user_func($callable);
 160                 }
 161         }
 162         common_element_end('head');
 163         common_element_start('body');
 164         common_element_start('div', array('id' => 'wrap'));
 165         common_element_start('div', array('id' => 'header'));
 166         common_nav_menu();
 167         common_element_start('a', array('href' => common_local_url('public')));
 168         common_element('img', array('src' => ($config['site']['logo']) ?
 169                                                                 ($config['site']['logo']) : theme_path('logo.png'),
 170                                                                 'alt' => $config['site']['name'],
 171                                                                 'id' => 'logo'));
 172         common_element_end('a');
 173         common_element_end('div');
 174         common_element_start('div', array('id' => 'content'));
 175 }
 176
 177 function common_show_footer() {
 178         global $xw, $config;
 179         common_element_end('div'); # content div
 180         common_foot_menu();
 181         common_element_start('div', array('id' => 'footer'));
 182         common_element('img', array('id' => 'cc',
 183                                                                 'src' => $config['license']['image'],
 184                                                                 'alt' => $config['license']['title']));
 185         common_element_start('p');
 186         common_text(_t('Unless otherwise specified, contents of this site are copyright by the contributors and available under the '));
 187         common_element('a', array('class' => 'license',
 188                                                           'rel' => 'license',
 189                                                           href => $config['license']['url']),
 190                                    $config['license']['title']);
 191         common_text(_t('. Contributors should be attributed by full name or nickname.'));
 192         common_element_end('p');
 193         common_element_end('div');
 194         common_element_end('div');
 195         common_element_end('body');
 196         common_element_end('html');
 197         common_end_xml();
 198 }
 199
 200 function common_text($txt) {
 201         global $xw;
 202         $xw->text($txt);
 203 }
 204
 205 function common_raw($xml) {
 206         global $xw;
 207         $xw->writeRaw($xml);
 208 }
 209
 210 function common_nav_menu() {
 211         $user = common_current_user();
 212         common_element_start('ul', array('id' => 'nav'));
 213         if ($user) {
 214                 common_menu_item(common_local_url('all', array('nickname' => $user->nickname)),
 215                                                  _t('Home'));
 216         }
 217         common_menu_item(common_local_url('public'), _t('Public'));
 218         common_menu_item(common_local_url('doc', array('title' => 'help')),
 219                                          _t('Help'));
 220         if ($user) {
 221                 common_menu_item(common_local_url('profilesettings'),
 222                                                  _t('Settings'));
 223                 common_menu_item(common_local_url('logout'),
 224                                                  _t('Logout'));
 225         } else {
 226                 common_menu_item(common_local_url('login'), _t('Login'));
 227                 common_menu_item(common_local_url('register'), _t('Register'));
 228         }
 229         common_element_end('ul');
 230 }
 231
 232 function common_foot_menu() {
 233         common_element_start('ul', array('id' => 'nav_sub'));
 234         common_menu_item(common_local_url('doc', array('title' => 'about')),
 235                                          _t('About'));
 236         common_menu_item(common_local_url('doc', array('title' => 'privacy')),
 237                                          _t('Privacy'));
 238         common_menu_item(common_local_url('doc', array('title' => 'source')),
 239                                          _t('Source'));
 240         common_element_end('ul');
 241 }
 242
 243 function common_menu_item($url, $text, $title=NULL, $is_selected=false) {
 244         $lattrs = array();
 245         if ($is_selected) {
 246                 $lattrs['class'] = 'current';
 247         }
 248         common_element_start('li', $lattrs);
 249         $attrs['href'] = $url;
 250         if ($title) {
 251                 $attrs['title'] = $title;
 252         }
 253         common_element('a', $attrs, $text);
 254         common_element_end('li');
 255 }
 256
 257 function common_input($id, $label, $value=NULL) {
 258         common_element_start('p');
 259         common_element('label', array('for' => $id), $label);
 260         $attrs = array('name' => $id,
 261                                    'type' => 'text',
 262                                    'id' => $id);
 263         if ($value) {
 264                 $attrs['value'] = htmlspecialchars($value);
 265         }
 266         common_element('input', $attrs);
 267         common_element_end('p');
 268 }
 269
 270 function common_hidden($id, $value) {
 271         common_element('input', array('name' => $id,
 272                                                                   'type' => 'hidden',
 273                                                                   'id' => $id,
 274                                                                   'value' => $value));
 275 }
 276
 277 function common_password($id, $label) {
 278         common_element_start('p');
 279         common_element('label', array('for' => $id), $label);
 280         $attrs = array('name' => $id,
 281                                    'type' => 'password',
 282                                    'id' => $id);
 283         common_element('input', $attrs);
 284         common_element_end('p');
 285 }
 286
 287 function common_submit($id, $label) {
 288         global $xw;
 289         common_element_start('p');
 290         common_element('input', array('type' => 'submit',
 291                                                                   'id' => $id,
 292                                                                   'name' => $id,
 293                                                                   'value' => $label));
 294         common_element_end('p');
 295 }
 296
 297 function common_textarea($id, $label, $content=NULL) {
 298         common_element_start('p');
 299         common_element('label', array('for' => $id), $label);
 300         common_element('textarea', array('rows' => 3,
 301                                                                          'cols' => 40,
 302                                                                          'name' => $id,
 303                                                                          'id' => $id),
 304                                    ($content) ? $content : ' ');
 305         common_element_end('p');
 306 }
 307
 308 # salted, hashed passwords are stored in the DB
 309
 310 function common_munge_password($id, $password) {
 311         return md5($id . $password);
 312 }
 313
 314 # check if a username exists and has matching password
 315 function common_check_user($nickname, $password) {
 316         $user = User::staticGet('nickname', $nickname);
 317         if (is_null($user)) {
 318                 return false;
 319         } else {
 320                 return (0 == strcmp(common_munge_password($password, $user->id),
 321                                                         $user->password));
 322         }
 323 }
 324
 325 # is the current user logged in?
 326 function common_logged_in() {
 327         return (!is_null(common_current_user()));
 328 }
 329
 330 function common_have_session() {
 331         return (0 != strcmp(session_id(), ''));
 332 }
 333
 334 function common_ensure_session() {
 335         if (!common_have_session()) {
 336                 @session_start();
 337         }
 338 }
 339
 340 function common_set_user($nickname) {
 341         if (is_null($nickname) && common_have_session()) {
 342                 unset($_SESSION['userid']);
 343                 return true;
 344         } else {
 345                 $user = User::staticGet('nickname', $nickname);
 346                 if ($user) {
 347                         common_ensure_session();
 348                         $_SESSION['userid'] = $user->id;
 349                         return true;
 350                 } else {
 351                         return false;
 352                 }
 353         }
 354         return false;
 355 }
 356
 357 # who is the current user?
 358 function common_current_user() {
 359         static $user = NULL; # FIXME: global memcached
 360         if (is_null($user)) {
 361                 common_ensure_session();
 362                 $id = $_SESSION['userid'];
 363                 if ($id) {
 364                         $user = User::staticGet($id);
 365                 }
 366         }
 367         return $user;
 368 }
 369
 370 # get canonical version of nickname for comparison
 371 function common_canonical_nickname($nickname) {
 372         # XXX: UTF-8 canonicalization (like combining chars)
 373         return strtolower($nickname);
 374 }
 375
 376 # get canonical version of email for comparison
 377 function common_canonical_email($email) {
 378         # XXX: canonicalize UTF-8
 379         # XXX: lcase the domain part
 380         return $email;
 381 }
 382
 383 define('URL_REGEX', '^|[ \t\r\n])((ftp|http|https|gopher|mailto|news|nntp|telnet|wais|file|prospero|aim|webcal):(([A-Za-z0-9$_.+!*(),;/?:@&~=-])|%[A-Fa-f0-9]{2}){2,}(#([a-zA-Z0-9][a-zA-Z0-9$_.+!*(),;/?:@&~=%-]*))?([A-Za-z0-9$_+!*();/?:~-]))');
 384
 385 function common_render_content($text, $notice) {
 386         $r = htmlspecialchars($text);
 387         $id = $notice->profile_id;
 388         $r = preg_replace('@https?://\S+@', '<a href="\0" class="extlink">\0</a>', $r);
 389         $r = preg_replace('/(^|\b)@([\w-]+)($|\b)/e', "'\\1@'.common_at_link($id, '\\2').'\\3'", $r);
 390         # XXX: # tags
 391         # XXX: machine tags
 392         return $r;
 393 }
 394
 395 function common_at_link($sender_id, $nickname) {
 396         # Try to find profiles this profile is subscribed to that have this nickname
 397         $recipient = new Profile();
 398         # XXX: chokety and bad
 399         $recipient->whereAdd('EXISTS (SELECT subscribed from subscription where subscriber = '.$sender_id.' and subscribed = id)', 'AND');
 400         $recipient->whereAdd('nickname = "' . trim($nickname) . '"', 'AND');
 401         if ($recipient->find(TRUE)) {
 402                 return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink tolistenee">'.$nickname.'</a>';
 403         }
 404         # Try to find profiles that listen to this profile and that have this nickname
 405         $recipient = new Profile();
 406         # XXX: chokety and bad
 407         $recipient->whereAdd('EXISTS (SELECT subscriber from subscription where subscribed = '.$sender_id.' and subscriber = id)', 'AND');
 408         $recipient->whereAdd('nickname = "' . trim($nickname) . '"', 'AND');
 409         if ($recipient->find(TRUE)) {
 410                 return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink tolistener">'.$nickname.'</a>';
 411         }
 412         # If this is a local user, try to find a local user with that nickname.
 413         $sender = User::staticGet($sender_id);
 414         if ($sender) {
 415                 $recipient_user = User::staticGet('nickname', $nickname);
 416                 if ($recipient_user) {
 417                         $recipient = $recipient->getProfile();
 418                         return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink usertouser">'.$nickname.'</a>';
 419                 }
 420         }
 421         # Otherwise, no links. @messages from local users to remote users,
 422         # or from remote users to other remote users, are just
 423         # outside our ability to make intelligent guesses about
 424         return $nickname;
 425 }
 426
 427 // where should the avatar go for this user?
 428
 429 function common_avatar_filename($id, $extension, $size=NULL, $extra=NULL) {
 430         global $config;
 431
 432         if ($size) {
 433                 return $id . '-' . $size . (($extra) ? ('-' . $extra) : '') . $extension;
 434         } else {
 435                 return $id . '-original' . (($extra) ? ('-' . $extra) : '') . $extension;
 436         }
 437 }
 438
 439 function common_avatar_path($filename) {
 440         global $config;
 441         return INSTALLDIR . '/avatar/' . $filename;
 442 }
 443
 444 function common_avatar_url($filename) {
 445         return common_path('avatar/'.$filename);
 446 }
 447
 448 function common_default_avatar($size) {
 449         static $sizenames = array(AVATAR_PROFILE_SIZE => 'profile',
 450                                                           AVATAR_STREAM_SIZE => 'stream',
 451                                                           AVATAR_MINI_SIZE => 'mini');
 452         global $config;
 453
 454         return common_path($config['avatar']['default'][$sizenames[$size]]);
 455 }
 456
 457 function common_local_url($action, $args=NULL) {
 458         global $config;
 459         if ($config['site']['fancy']) {
 460                 return common_fancy_url($action, $args);
 461         } else {
 462                 return common_simple_url($action, $args);
 463         }
 464 }
 465
 466 function common_fancy_url($action, $args=NULL) {
 467         switch (strtolower($action)) {
 468          case 'public':
 469                 return common_path('');
 470          case 'publicrss':
 471                 return common_path('rss');
 472          case 'doc':
 473                 return common_path('doc/'.$args['title']);
 474          case 'login':
 475          case 'logout':
 476          case 'register':
 477          case 'subscribe':
 478          case 'unsubscribe':
 479                 return common_path('main/'.$action);
 480          case 'avatar':
 481          case 'password':
 482                 return common_path('settings/'.$action);
 483          case 'profilesettings':
 484                 return common_path('settings/profile');
 485          case 'newnotice':
 486                 return common_path('notice/new');
 487          case 'shownotice':
 488                 return common_path('notice/'.$args['notice']);
 489          case 'subscriptions':
 490          case 'subscribed':
 491          case 'xrds':
 492          case 'all':
 493          case 'foaf':
 494                 return common_path($args['nickname'].'/'.$action);
 495          case 'allrss':
 496                 return common_path($args['nickname'].'/all/rss');
 497          case 'userrss':
 498                 return common_path($args['nickname'].'/rss');
 499          case 'showstream':
 500                 return common_path($args['nickname']);
 501          default:
 502                 return common_simple_url($action, $args);
 503         }
 504 }
 505
 506 function common_simple_url($action, $args=NULL) {
 507         global $config;
 508         /* XXX: pretty URLs */
 509         $extra = '';
 510         if ($args) {
 511                 foreach ($args as $key => $value) {
 512                         $extra .= "&${key}=${value}";
 513                 }
 514         }
 515         return common_path("index.php?action=${action}${extra}");
 516 }
 517
 518 function common_path($relative) {
 519         global $config;
 520         $pathpart = ($config['site']['path']) ? $config['site']['path']."/" : '';
 521         return "http://".$config['site']['server'].'/'.$pathpart.$relative;
 522 }
 523
 524 function common_date_string($dt) {
 525         // XXX: do some sexy date formatting
 526         // return date(DATE_RFC822, $dt);
 527         return $dt;
 528 }
 529
 530 function common_date_w3dtf($dt) {
 531         $t = strtotime($dt);
 532         return date(DATE_W3C, $t);
 533 }
 534
 535 function common_redirect($url, $code=307) {
 536         static $status = array(301 => "Moved Permanently",
 537                                                    302 => "Found",
 538                                                    303 => "See Other",
 539                                                    307 => "Temporary Redirect");
 540         header("Status: ${code} $status[$code]");
 541         header("Location: $url");
 542         common_element('a', array('href' => $url), $url);
 543 }
 544
 545 function common_broadcast_notice($notice, $remote=false) {
 546         // XXX: optionally use a queue system like http://code.google.com/p/microapps/wiki/NQDQ
 547         if (!$remote) {
 548                 # Make sure we have the OMB stuff
 549                 require_once(INSTALLDIR.'/lib/omb.php');
 550                 omb_broadcast_remote_subscribers($notice);
 551         }
 552         // XXX: broadcast notices to Jabber
 553         // XXX: broadcast notices to SMS
 554         // XXX: broadcast notices to other IM
 555         return true;
 556 }
 557
 558
 559 function common_profile_url($nickname) {
 560         return common_local_url('showstream', array('nickname' => $nickname));
 561 }
 562
 563 # Don't call if nobody's logged in
 564
 565 function common_notice_form() {
 566         $user = common_current_user();
 567         assert(!is_null($user));
 568         common_element_start('form', array('id' => 'status_form',
 569                                                                            'method' => 'POST',
 570                                                                            'action' => common_local_url('newnotice')));
 571         common_element_start('p');
 572         common_element('label', array('for' => 'status_update',
 573                                                                   'id' => 'status_label'),
 574                                    _t('What\'s up, ').$user->nickname.'?');
 575         common_element('textarea', array('id' => 'status_textarea',
 576                                                                          'name' => 'status_textarea'));
 577         common_element('input', array('id' => 'status_submit',
 578                                                                   'name' => 'status_submit',
 579                                                                   'type' => 'submit',
 580                                                                   'value' => _t('Send')));
 581         common_element_end('p');
 582         common_element_end('form');
 583 }
 584
 585 function common_mint_tag($extra) {
 586         global $config;
 587         return
 588           'tag:'.$config['tag']['authority'].','.
 589           $config['tag']['date'].':'.$config['tag']['prefix'].$extra;
 590 }
 591
 592 # Should make up a reasonable root URL
 593
 594 function common_root_url() {
 595         return common_path('');
 596 }
 597
 598 # returns $bytes bytes of random data as a hexadecimal string
 599 # "good" here is a goal and not a guarantee
 600
 601 function common_good_rand($bytes) {
 602         # XXX: use random.org...?
 603         if (file_exists('/dev/urandom')) {
 604                 return common_urandom($bytes);
 605         } else { # FIXME: this is probably not good enough
 606                 return common_mtrand($bytes);
 607         }
 608 }
 609
 610 function common_urandom($bytes) {
 611         $h = fopen('/dev/urandom', 'rb');
 612         # should not block
 613         $src = fread($h, $bytes);
 614         fclose($h);
 615         $enc = '';
 616         for ($i = 0; $i < $bytes; $i++) {
 617                 $enc .= sprintf("%02x", (ord($src[$i])));
 618         }
 619         return $enc;
 620 }
 621
 622 function common_mtrand($bytes) {
 623         $enc = '';
 624         for ($i = 0; $i < $bytes; $i++) {
 625                 $enc .= sprintf("%02x", mt_rand(0, 255));
 626         }
 627         return $enc;
 628 }
 629
 630 function common_set_returnto($url) {
 631         common_ensure_session();
 632         $_SESSION['returnto'] = $url;
 633 }
 634
 635 function common_get_returnto() {
 636         common_ensure_session();
 637         return $_SESSION['returnto'];
 638 }
 639
 640 function common_timestamp() {
 641         return date('YmdHis');
 642 }
 643
 644 // XXX: set up gettext
 645
 646 function _t($str) {
 647         return $str;
 648 }
 649
 650 function common_ensure_syslog() {
 651         static $initialized = false;
 652         if (!$initialized) {
 653                 global $config;
 654                 define_syslog_variables();
 655                 openlog($config['syslog']['appname'], 0, LOG_USER);
 656                 $initialized = true;
 657         }
 658 }
 659
 660 function common_log($priority, $msg, $filename=NULL) {
 661         common_ensure_syslog();
 662         syslog($priority, $msg);
 663 }
 664
 665 function common_debug($msg, $filename=NULL) {
 666         if ($filename) {
 667                 common_log(LOG_DEBUG, basename($filename).' - '.$msg);
 668         } else {
 669                 common_log(LOG_DEBUG, $msg);
 670         }
 671 }
 672
 673 function common_valid_http_url($url) {
 674         return Validate::uri($url, array('allowed_schemes' => array('http', 'https')));
 675 }
 676
 677 function common_valid_tag($tag) {
 678         if (preg_match('/^tag:(.*?),(\d{4}(-\d{2}(-\d{2})?)?):(.*)$/', $tag, $matches)) {
 679                 return (Validate::email($matches[1]) ||
 680                                 preg_match('/^([\w-\.]+)$/', $matches[1]));
 681         }
 682         return false;
 683 }
 684
 685 # Does a little before-after block for next/prev page
 686
 687 function common_pagination($have_before, $have_after, $page, $action, $args=NULL) {
 688
 689         if ($have_before || $have_after) {
 690                 common_element_start('div', array('id' => 'pagination'));
 691                 common_element_start('ul', array('id' => 'nav_pagination'));
 692         }
 693
 694         if ($have_before) {
 695                 $pargs = array('page' => $page-1);
 696                 $newargs = ($args) ? array_merge($args,$pargs) : $pargs;
 697
 698                 common_element_start('li', 'before');
 699                 common_element('a', array('href' => common_local_url($action, $newargs)),
 700                                            _t('« Before'));
 701                 common_element_end('li');
 702         }
 703
 704         if ($have_after) {
 705                 $pargs = array('page' => $page+1);
 706                 $newargs = ($args) ? array_merge($args,$pargs) : $pargs;
 707                 common_element_start('li', 'after');
 708                 common_element('a', array('href' => common_local_url($action, $newargs)),
 709                                                    _t('After »'));
 710                 common_element_end('li');
 711         }
 712
 713         if ($have_before || $have_after) {
 714                 common_element_end('ul');
 715                 common_element_end('div');
 716         }
 717 }