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         if (common_logged_in()) {
 174                 common_notice_form();
 175         }
 176         common_element_end('div');
 177         common_element_start('div', array('id' => 'content'));
 178 }
 179
 180 function common_show_footer() {
 181         global $xw, $config;
 182         common_element_end('div'); # content div
 183         common_foot_menu();
 184         common_element_start('div', array('id' => 'footer'));
 185         common_element('img', array('id' => 'cc',
 186                                                                 'src' => $config['license']['image'],
 187                                                                 'alt' => $config['license']['title']));
 188         common_element_start('p');
 189         common_text(_t('Unless otherwise specified, contents of this site are copyright by the contributors and available under the '));
 190         common_element('a', array('class' => 'license',
 191                                                           'rel' => 'license',
 192                                                           href => $config['license']['url']),
 193                                    $config['license']['title']);
 194         common_text(_t('. Contributors should be attributed by full name or nickname.'));
 195         common_element_end('p');
 196         common_element_end('div');
 197         common_element_end('div');
 198         common_element_end('body');
 199         common_element_end('html');
 200         common_end_xml();
 201 }
 202
 203 function common_text($txt) {
 204         global $xw;
 205         $xw->text($txt);
 206 }
 207
 208 function common_raw($xml) {
 209         global $xw;
 210         $xw->writeRaw($xml);
 211 }
 212
 213 function common_nav_menu() {
 214         $user = common_current_user();
 215         common_element_start('ul', array('id' => 'nav'));
 216         if ($user) {
 217                 common_menu_item(common_local_url('all', array('nickname' => $user->nickname)),
 218                                                  _t('Home'));
 219         }
 220         common_menu_item(common_local_url('public'), _t('Public'));
 221         common_menu_item(common_local_url('doc', array('title' => 'help')),
 222                                          _t('Help'));
 223         if ($user) {
 224                 common_menu_item(common_local_url('profilesettings'),
 225                                                  _t('Settings'));
 226                 common_menu_item(common_local_url('logout'),
 227                                                  _t('Logout'));
 228         } else {
 229                 common_menu_item(common_local_url('login'), _t('Login'));
 230                 common_menu_item(common_local_url('register'), _t('Register'));
 231         }
 232         common_element_end('ul');
 233 }
 234
 235 function common_foot_menu() {
 236         common_element_start('ul', array('id' => 'nav_sub'));
 237         common_menu_item(common_local_url('doc', array('title' => 'about')),
 238                                          _t('About'));
 239         common_menu_item(common_local_url('doc', array('title' => 'privacy')),
 240                                          _t('Privacy'));
 241         common_menu_item(common_local_url('doc', array('title' => 'source')),
 242                                          _t('Source'));
 243         common_element_end('ul');
 244 }
 245
 246 function common_menu_item($url, $text, $title=NULL, $is_selected=false) {
 247         $lattrs = array();
 248         if ($is_selected) {
 249                 $lattrs['class'] = 'current';
 250         }
 251         common_element_start('li', $lattrs);
 252         $attrs['href'] = $url;
 253         if ($title) {
 254                 $attrs['title'] = $title;
 255         }
 256         common_element('a', $attrs, $text);
 257         common_element_end('li');
 258 }
 259
 260 function common_input($id, $label, $value=NULL) {
 261         common_element_start('p');
 262         common_element('label', array('for' => $id), $label);
 263         $attrs = array('name' => $id,
 264                                    'type' => 'text',
 265                                    'id' => $id);
 266         if ($value) {
 267                 $attrs['value'] = htmlspecialchars($value);
 268         }
 269         common_element('input', $attrs);
 270         common_element_end('p');
 271 }
 272
 273 function common_hidden($id, $value) {
 274         common_element('input', array('name' => $id,
 275                                                                   'type' => 'hidden',
 276                                                                   'id' => $id,
 277                                                                   'value' => $value));
 278 }
 279
 280 function common_password($id, $label) {
 281         common_element_start('p');
 282         common_element('label', array('for' => $id), $label);
 283         $attrs = array('name' => $id,
 284                                    'type' => 'password',
 285                                    'id' => $id);
 286         common_element('input', $attrs);
 287         common_element_end('p');
 288 }
 289
 290 function common_submit($id, $label) {
 291         global $xw;
 292         common_element_start('p');
 293         common_element('input', array('type' => 'submit',
 294                                                                   'id' => $id,
 295                                                                   'name' => $id,
 296                                                                   'value' => $label));
 297         common_element_end('p');
 298 }
 299
 300 function common_textarea($id, $label, $content=NULL) {
 301         common_element_start('p');
 302         common_element('label', array('for' => $id), $label);
 303         common_element('textarea', array('rows' => 3,
 304                                                                          'cols' => 40,
 305                                                                          'name' => $id,
 306                                                                          'id' => $id),
 307                                    ($content) ? $content : ' ');
 308         common_element_end('p');
 309 }
 310
 311 # salted, hashed passwords are stored in the DB
 312
 313 function common_munge_password($id, $password) {
 314         return md5($id . $password);
 315 }
 316
 317 # check if a username exists and has matching password
 318 function common_check_user($nickname, $password) {
 319         $user = User::staticGet('nickname', $nickname);
 320         if (is_null($user)) {
 321                 return false;
 322         } else {
 323                 return (0 == strcmp(common_munge_password($password, $user->id),
 324                                                         $user->password));
 325         }
 326 }
 327
 328 # is the current user logged in?
 329 function common_logged_in() {
 330         return (!is_null(common_current_user()));
 331 }
 332
 333 function common_have_session() {
 334         return (0 != strcmp(session_id(), ''));
 335 }
 336
 337 function common_ensure_session() {
 338         if (!common_have_session()) {
 339                 @session_start();
 340         }
 341 }
 342
 343 function common_set_user($nickname) {
 344         if (is_null($nickname) && common_have_session()) {
 345                 unset($_SESSION['userid']);
 346                 return true;
 347         } else {
 348                 $user = User::staticGet('nickname', $nickname);
 349                 if ($user) {
 350                         common_ensure_session();
 351                         $_SESSION['userid'] = $user->id;
 352                         return true;
 353                 } else {
 354                         return false;
 355                 }
 356         }
 357         return false;
 358 }
 359
 360 # who is the current user?
 361 function common_current_user() {
 362         static $user = NULL; # FIXME: global memcached
 363         if (is_null($user)) {
 364                 common_ensure_session();
 365                 $id = $_SESSION['userid'];
 366                 if ($id) {
 367                         $user = User::staticGet($id);
 368                 }
 369         }
 370         return $user;
 371 }
 372
 373 # get canonical version of nickname for comparison
 374 function common_canonical_nickname($nickname) {
 375         # XXX: UTF-8 canonicalization (like combining chars)
 376         return strtolower($nickname);
 377 }
 378
 379 # get canonical version of email for comparison
 380 function common_canonical_email($email) {
 381         # XXX: canonicalize UTF-8
 382         # XXX: lcase the domain part
 383         return $email;
 384 }
 385
 386 define('URL_REGEX', '^|[ \t\r\n])((ftp|http|https|gopher|mailto|news|nntp|telnet|wais|file|prospero|aim|webcal):(([A-Za-z0-9$_.+!*(),;/?:@&~=-])|%[A-Fa-f0-9]{2}){2,}(#([a-zA-Z0-9][a-zA-Z0-9$_.+!*(),;/?:@&~=%-]*))?([A-Za-z0-9$_+!*();/?:~-]))');
 387
 388 function common_render_content($text, $notice) {
 389         $r = htmlspecialchars($text);
 390         $id = $notice->profile_id;
 391         $r = preg_replace('@https?://\S+@', '<a href="\0" class="extlink">\0</a>', $r);
 392         $r = preg_replace('/(^|\b)@([\w-]+)($|\b)/e', "'\\1@'.common_at_link($id, '\\2').'\\3'", $r);
 393         # XXX: # tags
 394         # XXX: machine tags
 395         return $r;
 396 }
 397
 398 function common_at_link($sender_id, $nickname) {
 399         # Try to find profiles this profile is subscribed to that have this nickname
 400         $recipient = new Profile();
 401         # XXX: chokety and bad
 402         $recipient->whereAdd('EXISTS (SELECT subscribed from subscription where subscriber = '.$sender_id.' and subscribed = id)', 'AND');
 403         $recipient->whereAdd('nickname = "' . trim($nickname) . '"', 'AND');
 404         if ($recipient->find(TRUE)) {
 405                 return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink tolistenee">'.$nickname.'</a>';
 406         }
 407         # Try to find profiles that listen to this profile and that have this nickname
 408         $recipient = new Profile();
 409         # XXX: chokety and bad
 410         $recipient->whereAdd('EXISTS (SELECT subscriber from subscription where subscribed = '.$sender_id.' and subscriber = id)', 'AND');
 411         $recipient->whereAdd('nickname = "' . trim($nickname) . '"', 'AND');
 412         if ($recipient->find(TRUE)) {
 413                 return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink tolistener">'.$nickname.'</a>';
 414         }
 415         # If this is a local user, try to find a local user with that nickname.
 416         $sender = User::staticGet($sender_id);
 417         if ($sender) {
 418                 $recipient_user = User::staticGet('nickname', $nickname);
 419                 if ($recipient_user) {
 420                         $recipient = $recipient->getProfile();
 421                         return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink usertouser">'.$nickname.'</a>';
 422                 }
 423         }
 424         # Otherwise, no links. @messages from local users to remote users,
 425         # or from remote users to other remote users, are just
 426         # outside our ability to make intelligent guesses about
 427         return $nickname;
 428 }
 429
 430 // where should the avatar go for this user?
 431
 432 function common_avatar_filename($id, $extension, $size=NULL, $extra=NULL) {
 433         global $config;
 434
 435         if ($size) {
 436                 return $id . '-' . $size . (($extra) ? ('-' . $extra) : '') . $extension;
 437         } else {
 438                 return $id . '-original' . (($extra) ? ('-' . $extra) : '') . $extension;
 439         }
 440 }
 441
 442 function common_avatar_path($filename) {
 443         global $config;
 444         return INSTALLDIR . '/avatar/' . $filename;
 445 }
 446
 447 function common_avatar_url($filename) {
 448         return common_path('avatar/'.$filename);
 449 }
 450
 451 function common_default_avatar($size) {
 452         static $sizenames = array(AVATAR_PROFILE_SIZE => 'profile',
 453                                                           AVATAR_STREAM_SIZE => 'stream',
 454                                                           AVATAR_MINI_SIZE => 'mini');
 455         global $config;
 456
 457         return common_path($config['avatar']['default'][$sizenames[$size]]);
 458 }
 459
 460 function common_local_url($action, $args=NULL) {
 461         global $config;
 462         if ($config['site']['fancy']) {
 463                 return common_fancy_url($action, $args);
 464         } else {
 465                 return common_simple_url($action, $args);
 466         }
 467 }
 468
 469 function common_fancy_url($action, $args=NULL) {
 470         switch (strtolower($action)) {
 471          case 'public':
 472                 return common_path('');
 473          case 'publicrss':
 474                 return common_path('rss');
 475          case 'doc':
 476                 return common_path('doc/'.$args['title']);
 477          case 'login':
 478          case 'logout':
 479          case 'register':
 480          case 'subscribe':
 481          case 'unsubscribe':
 482                 return common_path('main/'.$action);
 483          case 'avatar':
 484          case 'password':
 485                 return common_path('settings/'.$action);
 486          case 'profilesettings':
 487                 return common_path('settings/profile');
 488          case 'newnotice':
 489                 return common_path('notice/new');
 490          case 'shownotice':
 491                 return common_path('notice/'.$args['notice']);
 492          case 'subscriptions':
 493          case 'subscribed':
 494          case 'xrds':
 495          case 'all':
 496          case 'foaf':
 497                 return common_path($args['nickname'].'/'.$action);
 498          case 'allrss':
 499                 return common_path($args['nickname'].'/all/rss');
 500          case 'userrss':
 501                 return common_path($args['nickname'].'/rss');
 502          case 'showstream':
 503                 return common_path($args['nickname']);
 504          default:
 505                 return common_simple_url($action, $args);
 506         }
 507 }
 508
 509 function common_simple_url($action, $args=NULL) {
 510         global $config;
 511         /* XXX: pretty URLs */
 512         $extra = '';
 513         if ($args) {
 514                 foreach ($args as $key => $value) {
 515                         $extra .= "&${key}=${value}";
 516                 }
 517         }
 518         return common_path("index.php?action=${action}${extra}");
 519 }
 520
 521 function common_path($relative) {
 522         global $config;
 523         $pathpart = ($config['site']['path']) ? $config['site']['path']."/" : '';
 524         return "http://".$config['site']['server'].'/'.$pathpart.$relative;
 525 }
 526
 527 function common_date_string($dt) {
 528         // XXX: do some sexy date formatting
 529         // return date(DATE_RFC822, $dt);
 530         return $dt;
 531 }
 532
 533 function common_date_w3dtf($dt) {
 534         $t = strtotime($dt);
 535         return date(DATE_W3C, $t);
 536 }
 537
 538 function common_redirect($url, $code=307) {
 539         static $status = array(301 => "Moved Permanently",
 540                                                    302 => "Found",
 541                                                    303 => "See Other",
 542                                                    307 => "Temporary Redirect");
 543         header("Status: ${code} $status[$code]");
 544         header("Location: $url");
 545         common_element('a', array('href' => $url), $url);
 546 }
 547
 548 function common_broadcast_notice($notice, $remote=false) {
 549         // XXX: optionally use a queue system like http://code.google.com/p/microapps/wiki/NQDQ
 550         if (!$remote) {
 551                 # Make sure we have the OMB stuff
 552                 require_once(INSTALLDIR.'/lib/omb.php');
 553                 omb_broadcast_remote_subscribers($notice);
 554         }
 555         // XXX: broadcast notices to Jabber
 556         // XXX: broadcast notices to SMS
 557         // XXX: broadcast notices to other IM
 558         return true;
 559 }
 560
 561
 562 function common_profile_url($nickname) {
 563         return common_local_url('showstream', array('nickname' => $nickname));
 564 }
 565
 566 # Don't call if nobody's logged in
 567
 568 function common_notice_form() {
 569         $user = common_current_user();
 570         assert(!is_null($user));
 571         common_element_start('form', array('id' => 'status_form',
 572                                                                            'method' => 'POST',
 573                                                                            'action' => common_local_url('newnotice')));
 574         common_element_start('p');
 575         common_element('label', array('for' => 'status_update',
 576                                                                   'id' => 'status_label'),
 577                                    _t('What\'s up, ').$user->nickname.'?');
 578         common_element('textarea', array('id' => 'status_textarea',
 579                                                                          'name' => 'status_textarea'));
 580         common_element('input', array('id' => 'status_submit',
 581                                                                   'name' => 'status_submit',
 582                                                                   'type' => 'submit',
 583                                                                   'value' => _t('Send')));
 584         common_element_end('p');
 585         common_element_end('form');
 586 }
 587
 588 function common_mint_tag($extra) {
 589         global $config;
 590         return
 591           'tag:'.$config['tag']['authority'].','.
 592           $config['tag']['date'].':'.$config['tag']['prefix'].$extra;
 593 }
 594
 595 # Should make up a reasonable root URL
 596
 597 function common_root_url() {
 598         return common_path('');
 599 }
 600
 601 # returns $bytes bytes of random data as a hexadecimal string
 602 # "good" here is a goal and not a guarantee
 603
 604 function common_good_rand($bytes) {
 605         # XXX: use random.org...?
 606         if (file_exists('/dev/urandom')) {
 607                 return common_urandom($bytes);
 608         } else { # FIXME: this is probably not good enough
 609                 return common_mtrand($bytes);
 610         }
 611 }
 612
 613 function common_urandom($bytes) {
 614         $h = fopen('/dev/urandom', 'rb');
 615         # should not block
 616         $src = fread($h, $bytes);
 617         fclose($h);
 618         $enc = '';
 619         for ($i = 0; $i < $bytes; $i++) {
 620                 $enc .= sprintf("%02x", (ord($src[$i])));
 621         }
 622         return $enc;
 623 }
 624
 625 function common_mtrand($bytes) {
 626         $enc = '';
 627         for ($i = 0; $i < $bytes; $i++) {
 628                 $enc .= sprintf("%02x", mt_rand(0, 255));
 629         }
 630         return $enc;
 631 }
 632
 633 function common_set_returnto($url) {
 634         common_ensure_session();
 635         $_SESSION['returnto'] = $url;
 636 }
 637
 638 function common_get_returnto() {
 639         common_ensure_session();
 640         return $_SESSION['returnto'];
 641 }
 642
 643 function common_timestamp() {
 644         return date('YmdHis');
 645 }
 646
 647 // XXX: set up gettext
 648
 649 function _t($str) {
 650         return $str;
 651 }
 652
 653 function common_ensure_syslog() {
 654         static $initialized = false;
 655         if (!$initialized) {
 656                 global $config;
 657                 define_syslog_variables();
 658                 openlog($config['syslog']['appname'], 0, LOG_USER);
 659                 $initialized = true;
 660         }
 661 }
 662
 663 function common_log($priority, $msg, $filename=NULL) {
 664         common_ensure_syslog();
 665         syslog($priority, $msg);
 666 }
 667
 668 function common_debug($msg, $filename=NULL) {
 669         if ($filename) {
 670                 common_log(LOG_DEBUG, basename($filename).' - '.$msg);
 671         } else {
 672                 common_log(LOG_DEBUG, $msg);
 673         }
 674 }
 675
 676 function common_valid_http_url($url) {
 677         return Validate::uri($url, array('allowed_schemes' => array('http', 'https')));
 678 }
 679
 680 function common_valid_tag($tag) {
 681         if (preg_match('/^tag:(.*?),(\d{4}(-\d{2}(-\d{2})?)?):(.*)$/', $tag, $matches)) {
 682                 return (Validate::email($matches[1]) ||
 683                                 preg_match('/^([\w-\.]+)$/', $matches[1]));
 684         }
 685         return false;
 686 }
 687
 688 # Does a little before-after block for next/prev page
 689
 690 function common_pagination($have_before, $have_after, $page, $action, $args=NULL) {
 691
 692         if ($have_before || $have_after) {
 693                 common_element_start('div', array('id' => 'pagination'));
 694                 common_element_start('ul', array('id' => 'nav_pagination'));
 695         }
 696
 697         if ($have_before) {
 698                 $pargs = array('page' => $page-1);
 699                 $newargs = ($args) ? array_merge($args,$pargs) : $pargs;
 700
 701                 common_element_start('li', 'before');
 702                 common_element('a', array('href' => common_local_url($action, $newargs)),
 703                                            _t('« Before'));
 704                 common_element_end('li');
 705         }
 706
 707         if ($have_after) {
 708                 $pargs = array('page' => $page+1);
 709                 $newargs = ($args) ? array_merge($args,$pargs) : $pargs;
 710                 common_element_start('li', 'after');
 711                 common_element('a', array('href' => common_local_url($action, $newargs)),
 712                                                    _t('After »'));
 713                 common_element_end('li');
 714         }
 715
 716         if ($have_before || $have_after) {
 717                 common_element_end('ul');
 718                 common_element_end('div');
 719         }
 720 }