summaryrefslogtreecommitdiff
path: root/lib/util.php
blob: df8ae724199d16a3d6a20d50c6dc1467b3c4bf77 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
<?php
/*
 * Laconica - a distributed open-source microblogging tool
 * Copyright (C) 2008, Controlez-Vous, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/* XXX: break up into separate modules (HTTP, HTML, user, files) */

# Show a server error

function common_server_error($msg, $code=500) {
	static $status = array(500 => 'Internal Server Error',
						   501 => 'Not Implemented',
						   502 => 'Bad Gateway',
						   503 => 'Service Unavailable',
						   504 => 'Gateway Timeout',
						   505 => 'HTTP Version Not Supported');

	if (!array_key_exists($code, $status)) {
		$code = 500;
	}

	$status_string = $status[$code];

	header('HTTP/1.1 '.$code.' '.$status_string);
	header('Content-type: text/plain');

	print $msg;
	print "\n";
	exit();
}

# Show a user error
function common_user_error($msg, $code=400) {
	static $status = array(400 => 'Bad Request',
						   401 => 'Unauthorized',
						   402 => 'Payment Required',
						   403 => 'Forbidden',
						   404 => 'Not Found',
						   405 => 'Method Not Allowed',
						   406 => 'Not Acceptable',
						   407 => 'Proxy Authentication Required',
						   408 => 'Request Timeout',
						   409 => 'Conflict',
						   410 => 'Gone',
						   411 => 'Length Required',
						   412 => 'Precondition Failed',
						   413 => 'Request Entity Too Large',
						   414 => 'Request-URI Too Long',
						   415 => 'Unsupported Media Type',
						   416 => 'Requested Range Not Satisfiable',
						   417 => 'Expectation Failed');

	if (!array_key_exists($code, $status)) {
		$code = 400;
	}

	$status_string = $status[$code];

	header('HTTP/1.1 '.$code.' '.$status_string);

	common_show_header('Error');
	common_element('div', array('class' => 'error'), $msg);
	common_show_footer();
}

$xw = null;

# Start an HTML element
function common_element_start($tag, $attrs=NULL) {
	global $xw;
	$xw->startElement($tag);
	if (is_array($attrs)) {
		foreach ($attrs as $name => $value) {
			$xw->writeAttribute($name, $value);
		}
	} else if (is_string($attrs)) {
		$xw->writeAttribute('class', $attrs);
	}
}

function common_element_end($tag) {
	global $xw;
	$xw->endElement();
}

function common_element($tag, $attrs=NULL, $content=NULL) {
    common_element_start($tag, $attrs);
	if ($content) {
		global $xw;
		$xw->text($content);
	}
	common_element_end($tag);
}

function common_start_xml($doc=NULL, $public=NULL, $system=NULL) {
	global $xw;
	$xw = new XMLWriter();
	$xw->openURI('php://output');
	$xw->setIndent(true);
	$xw->startDocument('1.0', 'UTF-8');
	if ($doc) {
		$xw->writeDTD($doc, $public, $system);
	}
}

function common_end_xml() {
	global $xw;
	$xw->endDocument();
	$xw->flush();
}

function common_show_header($pagetitle, $callable=NULL, $data=NULL, $notice=NULL) {
	global $config, $xw;

	header('Content-Type: application/xhtml+xml');

	common_start_xml('html',
					 '-//W3C//DTD XHTML 1.0 Strict//EN',
					 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd');

	# FIXME: correct language for interface

	common_element_start('html', array('xmlns' => 'http://www.w3.org/1999/xhtml',
									   'xml:lang' => 'en',
									   'lang' => 'en'));

	common_element_start('head');
	common_element('title', NULL,
				   $pagetitle . " - " . $config['site']['name']);
	common_element('link', array('rel' => 'stylesheet',
								 'type' => 'text/css',
								 'href' => theme_path('display.css'),
								 'media' => 'screen, projection, tv'));
	foreach (array(6,7) as $ver) {
		if (file_exists(theme_file('ie'.$ver.'.css'))) {
			# Yes, IE people should be put in jail.
			$xw->writeComment('[if lte IE '.$ver.']><link rel="stylesheet" type="text/css" '.
							  'href="'.theme_path('ie'.$ver.'.css').' /><![endif]');
		}
	}
	if ($callable) {
		if ($data) {
			call_user_func($callable, $data);
		} else {
			call_user_func($callable);
		}
	}
	common_element_end('head');
	common_element_start('body');
	common_element_start('div', array('id' => 'wrap'));
	common_element_start('div', array('id' => 'header'));
	common_nav_menu();
	common_element_start('a', array('href' => common_local_url('public')));
	common_element('img', array('src' => ($config['site']['logo']) ? 
								($config['site']['logo']) : theme_path('logo.png'),
								'alt' => $config['site']['name'],
								'id' => 'logo'));
	if (common_logged_in()) {
		common_notice_form();
	}
	common_element_end('div');
	common_element_start('div', array('id' => 'content'));
	if (common_logged_in()) {
		common_views_menu();
	}
}

function common_show_footer() {
	global $xw, $config;
	common_element_end('div'); # content div
	common_foot_menu();
	common_element_start('div', 'footer');
	common_license_block();
	common_element_end('div');
	common_element_end('div');
	common_element_end('body');
	common_element_end('html');
	common_end_xml();
}

function common_text($txt) {
	global $xw;
	$xw->text($txt);
}

function common_raw($xml) {
	global $xw;
	$xw->writeRaw($xml);
}

function common_license_block() {
	global $config, $xw;
	common_element_start('p', 'license');
	common_element_start('a', array('class' => 'license',
									'rel' => 'license',
									href => $config['license']['url']));
	common_element('img', array('class' => 'license',
								'src' => $config['license']['image'],
								'alt' => $config['license']['title']));
	common_element_end('a');
	common_text(_t('Unless otherwise specified, contents of this site are copyright by the contributors and available under the '));
	common_element('a', array('class' => 'license',
							  'rel' => 'license',
							  href => $config['license']['url']),
				   $config['license']['title']);
	common_text(_t('. Contributors should be attributed by full name or nickname.'));
	common_element_end('p');
}

function common_nav_menu() {
	$user = common_current_user();
	common_element_start('ul', array('id' => 'nav'));
	common_menu_item(common_local_url('public'), _t('Public'));
	if ($user) {
		common_menu_item(common_local_url('profilesettings'),
						 _t('Settings'));
		common_menu_item(common_local_url('logout'),
						 _t('Logout'));
	} else {
		common_menu_item(common_local_url('login'), _t('Login'));
		common_menu_item(common_local_url('register'), _t('Register'));
	}
	common_element_end('ul');
}

function common_views_menu() {
	common_menu_item(common_local_url('all', array('nickname' =>
												   $user->nickname)),
					 _t('Home'));
	common_menu_item(common_local_url('showstream', array('nickname' =>
														  $user->nickname)),
					 _t('Profile'),  $user->fullname || $user->nickname);
}

function common_foot_menu() {
	common_element_start('ul', array('id' => 'nav_sub'));
	common_menu_item(common_local_url('doc', array('title' => 'about')),
					 _t('About'));
	common_menu_item(common_local_url('doc', array('title' => 'help')),
					 _t('Help'));
	common_menu_item(common_local_url('doc', array('title' => 'privacy')),
					 _t('Privacy'));
	common_menu_item(common_local_url('doc', array('title' => 'source')),
					 _t('Source'));
	common_element_end('ul');
}

function common_menu_item($url, $text, $title=NULL) {
	$attrs['href'] = $url;
	if ($title) {
		$attrs['title'] = $title;
	}
	common_element_start('li', 'menuitem');
	common_element('a', $attrs, $text);
	common_element_end('li');
}

function common_input($id, $label, $value=NULL) {
	common_element_start('p');
	common_element('label', array('for' => $id), $label);
	$attrs = array('name' => $id,
				   'type' => 'text',
				   'id' => $id);
	if ($value) {
		$attrs['value'] = htmlspecialchars($value);
	}
	common_element('input', $attrs);
	common_element_end('p');
}

function common_hidden($id, $value) {
	common_element('input', array('name' => $id,
								  'type' => 'hidden',
								  'id' => $id,
								  'value' => $value));
}

function common_password($id, $label) {
	common_element_start('p');
	common_element('label', array('for' => $id), $label);
	$attrs = array('name' => $id,
				   'type' => 'password',
				   'id' => $id);
	common_element('input', $attrs);
	common_element_end('p');
}

function common_submit($id, $label) {
	global $xw;
	common_element_start('p');
	common_element_start('label', array('for' => $id));
	$xw->writeRaw('&nbsp;');
	common_element_end('label');
	common_element('input', array('type' => 'submit',
								  'id' => $id,
								  'name' => $id,
								  'value' => $label,
								  'class' => 'button'));
	common_element_end('p');
}

function common_textarea($id, $label, $content=NULL) {
	common_element_start('p');
	common_element('label', array('for' => $id), $label);
	common_element('textarea', array('rows' => 3,
									 'cols' => 40,
									 'name' => $id,
									 'id' => $id,
									 'class' => 'width50'),
				   ($content) ? $content : ' ');
	common_element_end('p');
}

# salted, hashed passwords are stored in the DB

function common_munge_password($id, $password) {
	return md5($id . $password);
}

# check if a username exists and has matching password
function common_check_user($nickname, $password) {
	$user = User::staticGet('nickname', $nickname);
	if (is_null($user)) {
		return false;
	} else {
		return (0 == strcmp(common_munge_password($password, $user->id),
							$user->password));
	}
}

# is the current user logged in?
function common_logged_in() {
	return (!is_null(common_current_user()));
}

function common_have_session() {
	return (0 != strcmp(session_id(), ''));
}

function common_ensure_session() {
	if (!common_have_session()) {
		@session_start();
	}
}

function common_set_user($nickname) {
	if (is_null($nickname) && common_have_session()) {
		unset($_SESSION['userid']);
		return true;
	} else {
		$user = User::staticGet('nickname', $nickname);
		if ($user) {
			common_ensure_session();
			$_SESSION['userid'] = $user->id;
			return true;
		} else {
			return false;
		}
	}
	return false;
}

# who is the current user?
function common_current_user() {
	static $user = NULL; # FIXME: global memcached
	if (is_null($user)) {
		common_ensure_session();
		$id = $_SESSION['userid'];
		if ($id) {
			$user = User::staticGet($id);
		}
	}
	return $user;
}

# get canonical version of nickname for comparison
function common_canonical_nickname($nickname) {
	# XXX: UTF-8 canonicalization (like combining chars)
	return $nickname;
}

# get canonical version of email for comparison
function common_canonical_email($email) {
	# XXX: canonicalize UTF-8
	# XXX: lcase the domain part
	return $email;
}

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$_+!*();/?:~-]))');

function common_render_content($text, $notice) {
	$r = htmlspecialchars($text);
	$id = $notice->profile_id;
	$r = preg_replace('@https?://\S+@', '<a href="\0" class="extlink">\0</a>', $r);
	$r = preg_replace('/(^|\b)@([\w-]+)($|\b)/e', "'\\1@'.common_at_link($id, '\\2').'\\3'", $r);
	# XXX: # tags
	# XXX: machine tags
	return $r;
}

function common_at_link($sender_id, $nickname) {
	# Try to find profiles this profile is subscribed to that have this nickname
	$recipient = new Profile();
	# XXX: chokety and bad
	$recipient->whereAdd('EXISTS (SELECT subscribed from subscription where subscriber = '.$sender_id.' and subscribed = id)', 'AND');
	$recipient->whereAdd('nickname = "' . trim($nickname) . '"', 'AND');
	if ($recipient->find(TRUE)) {
		return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink tolistenee">'.$nickname.'</a>';
	}
	# Try to find profiles that listen to this profile and that have this nickname
	$recipient = new Profile();
	# XXX: chokety and bad
	$recipient->whereAdd('EXISTS (SELECT subscriber from subscription where subscribed = '.$sender_id.' and subscriber = id)', 'AND');
	$recipient->whereAdd('nickname = "' . trim($nickname) . '"', 'AND');
	if ($recipient->find(TRUE)) {
		return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink tolistener">'.$nickname.'</a>';
	}
	# If this is a local user, try to find a local user with that nickname.
	$sender = User::staticGet($sender_id);
	if ($sender) {
		$recipient_user = User::staticGet('nickname', $nickname);
		if ($recipient_user) {
			$recipient = $recipient->getProfile();
			return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink usertouser">'.$nickname.'</a>';
		}
	}
	# Otherwise, no links. @messages from local users to remote users,
	# or from remote users to other remote users, are just
	# outside our ability to make intelligent guesses about
	return $nickname;
}

// where should the avatar go for this user?

function common_avatar_filename($id, $extension, $size=NULL, $extra=NULL) {
	global $config;

	if ($size) {
		return $id . '-' . $size . (($extra) ? ('-' . $extra) : '') . $extension;
	} else {
		return $id . '-original' . (($extra) ? ('-' . $extra) : '') . $extension;
	}
}

function common_avatar_path($filename) {
	global $config;
	return INSTALLDIR . '/avatar/' . $filename;
}

function common_avatar_url($filename) {
	return common_path('avatar/'.$filename);
}

function common_default_avatar($size) {
	static $sizenames = array(AVATAR_PROFILE_SIZE => 'profile',
							  AVATAR_STREAM_SIZE => 'stream',
							  AVATAR_MINI_SIZE => 'mini');
	global $config;

	return common_path($config['avatar']['default'][$sizenames[$size]]);
}

function common_local_url($action, $args=NULL) {
	global $config;
	if ($config['site']['fancy']) {
		return common_fancy_url($action, $args);
	} else {
		return common_simple_url($action, $args);
	}
}

function common_fancy_url($action, $args=NULL) {
	switch (strtolower($action)) {
	 case 'public':
		return common_path('');
	 case 'publicrss':
		return common_path('rss');
	 case 'doc':
		return common_path('doc/'.$args['title']);
	 case 'login':
	 case 'logout':
	 case 'register':
	 case 'subscribe':
	 case 'unsubscribe':
		return common_path('main/'.$action);
	 case 'avatar':
	 case 'password':
		return common_path('settings/'.$action);
	 case 'profilesettings':
		return common_path('settings/profile');
	 case 'newnotice':
		return common_path('notice/new');
	 case 'shownotice':
		return common_path('notice/'.$args['notice']);
	 case 'subscriptions':
	 case 'subscribed':
	 case 'xrds':		
	 case 'all':
	 case 'foaf':
		return common_path($args['nickname'].'/'.$action);
	 case 'allrss':
		return common_path($args['nickname'].'/all/rss');
	 case 'userrss':
		return common_path($args['nickname'].'/rss');
	 case 'showstream':
		return common_path($args['nickname']);
	 default:
		return common_simple_url($action, $args);
	}
}

function common_simple_url($action, $args=NULL) {
	global $config;
	/* XXX: pretty URLs */
	$extra = '';
	if ($args) {
		foreach ($args as $key => $value) {
			$extra .= "&${key}=${value}";
		}
	}
	return common_path("index.php?action=${action}${extra}");
}

function common_path($relative) {
	global $config;
	$pathpart = ($config['site']['path']) ? $config['site']['path']."/" : '';
	return "http://".$config['site']['server'].'/'.$pathpart.$relative;
}

function common_date_string($dt) {
	// XXX: do some sexy date formatting
	// return date(DATE_RFC822, $dt);
	return $dt;
}

function common_date_w3dtf($dt) {
	$t = strtotime($dt);
	return date(DATE_W3C, $t);
}

function common_redirect($url, $code=307) {
	static $status = array(301 => "Moved Permanently",
						   302 => "Found",
						   303 => "See Other",
						   307 => "Temporary Redirect");
	header("Status: ${code} $status[$code]");
	header("Location: $url");
	common_element('a', array('href' => $url), $url);
}

function common_broadcast_notice($notice, $remote=false) {
	// XXX: optionally use a queue system like http://code.google.com/p/microapps/wiki/NQDQ
	if (!$remote) {
		# Make sure we have the OMB stuff
		require_once(INSTALLDIR.'/lib/omb.php');
		omb_broadcast_remote_subscribers($notice);
	}
	// XXX: broadcast notices to Jabber
	// XXX: broadcast notices to SMS
	// XXX: broadcast notices to other IM
	return true;
}


function common_profile_url($nickname) {
	return common_local_url('showstream', array('nickname' => $nickname));
}

# Don't call if nobody's logged in

function common_notice_form() {
	$user = common_current_user();
	assert(!is_null($user));
	common_element_start('form', array('id' => 'status_form',
									   'method' => 'POST',
									   'action' => common_local_url('newnotice')));
	common_element('label', array('for' => 'status_update',
								  'id' => 'status_label'),
				   _t('What\'s up, ').$user->nickname.'?');
	common_element('textarea', 'status_textarea');
	common_element('input', array('id' => 'status_submit',
								  'type' => 'submit',
								  'value' => _t('Send')));
	common_element_end('form');
}

function common_mint_tag($extra) {
	global $config;
	return
	  'tag:'.$config['tag']['authority'].','.
	  $config['tag']['date'].':'.$config['tag']['prefix'].$extra;
}

# Should make up a reasonable root URL

function common_root_url() {
	return common_path('');
}

# returns $bytes bytes of random data as a hexadecimal string
# "good" here is a goal and not a guarantee

function common_good_rand($bytes) {
	# XXX: use random.org...?
	if (file_exists('/dev/urandom')) {
		return common_urandom($bytes);
	} else { # FIXME: this is probably not good enough
		return common_mtrand($bytes);
	}
}

function common_urandom($bytes) {
	$h = fopen('/dev/urandom', 'rb');
	# should not block
	$src = fread($h, $bytes);
	fclose($h);
	$enc = '';
	for ($i = 0; $i < $bytes; $i++) {
		$enc .= sprintf("%02x", (ord($src[$i])));
	}
	return $enc;
}

function common_mtrand($bytes) {
	$enc = '';
	for ($i = 0; $i < $bytes; $i++) {
		$enc .= sprintf("%02x", mt_rand(0, 255));
	}
	return $enc;
}

function common_set_returnto($url) {
	common_ensure_session();
	$_SESSION['returnto'] = $url;
}

function common_get_returnto() {
	common_ensure_session();
	return $_SESSION['returnto'];
}

function common_timestamp() {
	return date('YmdHis');
}

// XXX: set up gettext

function _t($str) {
	return $str;
}

function common_ensure_syslog() {
	static $initialized = false;
	if (!$initialized) {
		global $config;
		define_syslog_variables();
		openlog($config['syslog']['appname'], 0, LOG_USER);
		$initialized = true;
	}
}

function common_log($priority, $msg, $filename=NULL) {
	common_ensure_syslog();
	syslog($priority, $msg);
}

function common_debug($msg, $filename=NULL) {
	if ($filename) {
		common_log(LOG_DEBUG, basename($filename).' - '.$msg);
	} else {
		common_log(LOG_DEBUG, $msg);
	}
}

function common_valid_http_url($url) {
	return Validate::uri($url, array('allowed_schemes' => array('http', 'https')));
}

function common_valid_tag($tag) {
	if (preg_match('/^tag:(.*?),(\d{4}(-\d{2}(-\d{2})?)?):(.*)$/', $tag, $matches)) {
		return (Validate::email($matches[1]) ||
				preg_match('/^([\w-\.]+)$/', $matches[1]));
	}
	return false;
}

# Does a little before-after block for next/prev page

function common_pagination($have_before, $have_after, $page, $action, $args=NULL) {		
	
	if ($have_before || $have_after) {
		common_element_start('div', array('id' => 'pagination'));
		common_element_start('ul', array('id' => 'nav_pagination'));
	}
	
	if ($have_before) {
		$pargs = array('page' => $page-1);
		$newargs = ($args) ? array_merge($args,$pargs) : $pargs;
										 
		common_element_start('li', 'before');
		common_element('a', array('href' => common_local_url($action, $newargs)),
					   _t('« Before'));
		common_element_end('li');
	}

	if ($have_after) {
		$pargs = array('page' => $page+1);
		$newargs = ($args) ? array_merge($args,$pargs) : $pargs;
		common_element_start('li', 'after');
		common_element('a', array('href' => common_local_url($action, $newargs)),
						   _t('After »'));
		common_element_end('li');
	}
	
	if ($have_before || $have_after) {
		common_element_end('ul');
		common_element_end('div');
	}
}