X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=lib%2Futil.php;h=1e874e04b2be26637da91a76e79af299384422f8;hb=93e249de2a28775e3a40e63324371fec359fb93b;hp=03d549334a2a6db5ca0d675b3216d8972be5c62e;hpb=73a0271960a5e7e2bc6e040595d3071d7b689a99;p=quix0rs-gnu-social.git

diff --git a/lib/util.php b/lib/util.php
index 03d549334a..009a0457ce 100644
--- a/lib/util.php
+++ b/lib/util.php
@@ -17,1146 +17,1931 @@
  * 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');
+/* XXX: break up into separate modules (HTTP, user, files) */
 
-	if (!array_key_exists($code, $status)) {
-		$code = 500;
-	}
+// Show a server error
 
-	$status_string = $status[$code];
+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'), $msg);
+    common_show_footer();
+}
+
+function common_init_locale($language=null)
+{
+    if(!$language) {
+        $language = common_language();
+    }
+    putenv('LANGUAGE='.$language);
+    putenv('LANG='.$language);
+    return setlocale(LC_ALL, $language . ".utf8",
+                     $language . ".UTF8",
+                     $language . ".utf-8",
+                     $language . ".UTF-8",
+                     $language);
+}
+
+function common_init_language()
+{
+    mb_internal_encoding('UTF-8');
+    $language = common_language();
+    // So we don't have to make people install the gettext locales
+    $locale_set = common_init_locale($language);
+    bindtextdomain("laconica", common_config('site','locale_path'));
+    bind_textdomain_codeset("laconica", "UTF-8");
+    textdomain("laconica");
+    setlocale(LC_CTYPE, 'C');
+    if(!$locale_set) {
+        common_log(LOG_INFO,'Language requested:'.$language.' - locale could not be set:',__FILE__);
+    }
+}
+
+function common_timezone()
+{
+    if (common_logged_in()) {
+        $user = common_current_user();
+        if ($user->timezone) {
+            return $user->timezone;
+        }
+    }
+
+    global $config;
+    return $config['site']['timezone'];
+}
+
+function common_language()
+{
+
+    // If there is a user logged in and they've set a language preference
+    // then return that one...
+    if (common_logged_in()) {
+        $user = common_current_user();
+        $user_language = $user->language;
+        if ($user_language)
+          return $user_language;
+    }
+
+    // Otherwise, find the best match for the languages requested by the
+    // user's browser...
+    $httplang = isset($_SERVER['HTTP_ACCEPT_LANGUAGE']) ? $_SERVER['HTTP_ACCEPT_LANGUAGE'] : null;
+    if (!empty($httplang)) {
+        $language = client_prefered_language($httplang);
+        if ($language)
+          return $language;
+    }
+
+    // Finally, if none of the above worked, use the site's default...
+    return common_config('site', 'language');
+}
+// salted, hashed passwords are stored in the DB
+
+function common_munge_password($password, $id)
+{
+    return md5($password . $id);
+}
 
-	header('HTTP/1.1 '.$code.' '.$status_string);
-	header('Content-type: text/plain');
+// check if a username exists and has matching password
+function common_check_user($nickname, $password)
+{
+    // NEVER allow blank passwords, even if they match the DB
+    if (mb_strlen($password) == 0) {
+        return false;
+    }
+    $user = User::staticGet('nickname', $nickname);
+    if (is_null($user)) {
+        return false;
+    } else {
+        if (0 == strcmp(common_munge_password($password, $user->id),
+                        $user->password)) {
+            return $user;
+        } else {
+            return false;
+        }
+    }
+}
+
+// is the current user logged in?
+function common_logged_in()
+{
+    return (!is_null(common_current_user()));
+}
 
-	print $msg;
-	print "\n";
-	exit();
+function common_have_session()
+{
+    return (0 != strcmp(session_id(), ''));
 }
 
-# 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;
-	# TODO: switch based on $tag
-	$xw->fullEndElement();
-}
-
-function common_element($tag, $attrs=NULL, $content=NULL) {
-    common_element_start($tag, $attrs);
-    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();
-	$xw->flush();
-}
-
-define('PAGE_TYPE_PREFS', 'application/xhtml+xml,text/html;q=0.7,application/xml;q=0.3,text/xml;q=0.2');
-
-function common_show_header($pagetitle, $callable=NULL, $data=NULL, $headercall=NULL) {
-	global $config, $xw;
-
-	$httpaccept = isset($_SERVER['HTTP_ACCEPT']) ? $_SERVER['HTTP_ACCEPT'] : NULL;
-
-	# XXX: allow content negotiation for RDF, RSS, or XRDS
-
-	$type = common_negotiate_type(common_accept_to_prefs($httpaccept),
-								  common_accept_to_prefs(PAGE_TYPE_PREFS));
-
-	if (!$type) {
-		common_user_error(_t('This page is not available in a media type you accept'), 406);
-		exit(0);
-	}
-
-	header('Content-Type: '.$type);
-
-	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'.$ver.'.css').'" /><![endif]');
-		}
-	}
-
-	common_element('script', array('type' => 'text/javascript',
-								   'src' => common_path('js/jquery.min.js')),
-				   ' ');
-	common_element('script', array('type' => 'text/javascript',
-								   'src' => common_path('js/util.js')),
-				   ' ');
-
-	if ($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();
-	if ((is_string($config['site']['logo']) && (strlen($config['site']['logo']) > 0))
-		|| file_exists(theme_file('logo.png')))
-	{
-		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'));
-		common_element_end('a');
-	} else {
-		common_element_start('p', array('id' => 'branding'));
-		common_element('a', array('href' => common_local_url('public')),
-					   $config['site']['name']);
-		common_element_end('p');
-	}
-
-	common_element('h1', 'pagetitle', $pagetitle);
-
-	if ($headercall) {
-		if ($data) {
-			call_user_func($headercall, $data);
-		} else {
-			call_user_func($headercall);
-		}
-	}
-	common_element_end('div');
-	common_element_start('div', array('id' => 'content'));
-}
-
-function common_show_footer() {
-	global $xw, $config;
-	common_element_end('div'); # content div
-	common_foot_menu();
-	common_element_start('div', array('id' => 'footer'));
-	common_element_start('div', 'laconica');
-	if (common_config('site', 'broughtby')) {
-		$instr = _t('**%%site.name%%** is a microblogging service brought to you by [%%site.broughtby%%](%%site.broughtbyurl%%). ');
-	} else {
-		$instr = _t('**%%site.name%%** is a microblogging service. ');
-	}
-	$instr .= _t('It runs the [Laconica](http://laconi.ca/) ' .
-		         'microblogging software, version ' . LACONICA_VERSION . ', ' .
-		         'available under the ' .
-		         '[GNU Affero General Public License]' .
-		         '(http://www.fsf.org/licensing/licenses/agpl-3.0.html).');
-    $output = common_markup_to_html($instr);
-    common_raw($output);
-	common_element_end('div');
-	common_element('img', array('id' => 'cc',
-								'src' => $config['license']['image'],
-								'alt' => $config['license']['title']));
-	common_element_start('p');
-	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']),
-				   $config['license']['title']);
-	common_text(_t('. Contributors should be attributed by full name or nickname.'));
-	common_element_end('p');
-	common_element_end('div');
-	common_element_end('div');
-	common_element_end('body');
-	common_element_end('html');
-	common_end_xml();
-}
-
-function common_text($txt) {
-	global $xw;
-	$xw->text($txt);
-}
-
-function common_raw($xml) {
-	global $xw;
-	$xw->writeRaw($xml);
-}
-
-function common_nav_menu() {
-	$user = common_current_user();
-	common_element_start('ul', array('id' => 'nav'));
-	if ($user) {
-		common_menu_item(common_local_url('all', array('nickname' => $user->nickname)),
-						 _t('Home'));
-	}
-	common_menu_item(common_local_url('public'), _t('Public'));
-	common_menu_item(common_local_url('doc', array('title' => 'help')),
-					 _t('Help'));
-	if ($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_menu_item(common_local_url('openidlogin'), _t('OpenID'));
-	}
-	common_element_end('ul');
-}
-
-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' => 'faq')),
-					 _t('FAQ'));
-	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_menu_item(common_local_url('doc', array('title' => 'contact')),
-					 _t('Contact'));
-	common_element_end('ul');
-}
-
-function common_menu_item($url, $text, $title=NULL, $is_selected=false) {
-	$lattrs = array();
-	if ($is_selected) {
-		$lattrs['class'] = 'current';
-	}
-	common_element_start('li', $lattrs);
-	$attrs['href'] = $url;
-	if ($title) {
-		$attrs['title'] = $title;
-	}
-	common_element('a', $attrs, $text);
-	common_element_end('li');
-}
-
-function common_input($id, $label, $value=NULL,$instructions=NULL) {
-	common_element_start('p');
-	common_element('label', array('for' => $id), $label);
-	$attrs = array('name' => $id,
-				   'type' => 'text',
-				   'class' => 'input_text',
-				   'id' => $id);
-	if ($value) {
-		$attrs['value'] = htmlspecialchars($value);
-	}
-	common_element('input', $attrs);
-	if ($instructions) {
-		common_element('span', 'input_instructions', $instructions);
-	}
-	common_element_end('p');
-}
-
-function common_checkbox($id, $label, $checked=false, $instructions=NULL, $value='true')
-{
-	common_element_start('p');
-	$attrs = array('name' => $id,
-				   'type' => 'checkbox',
-				   'class' => 'checkbox',
-				   'id' => $id);
-	if ($value) {
-		$attrs['value'] = htmlspecialchars($value);
-	}
-	if ($checked) {
-		$attrs['checked'] = 'checked';
-	}
-	common_element('input', $attrs);
-	# XXX: use a <label>
-	common_text(' ');
-	common_element('span', 'checkbox_label', $label);
-	common_text(' ');
-	if ($instructions) {
-		common_element('span', 'input_instructions', $instructions);
-	}
-	common_element_end('p');
-}
-
-function common_hidden($id, $value) {
-	common_element('input', array('name' => $id,
-								  'type' => 'hidden',
-								  'id' => $id,
-								  'value' => $value));
-}
-
-function common_password($id, $label, $instructions=NULL) {
-	common_element_start('p');
-	common_element('label', array('for' => $id), $label);
-	$attrs = array('name' => $id,
-				   'type' => 'password',
-				   'class' => 'password',
-				   'id' => $id);
-	common_element('input', $attrs);
-	if ($instructions) {
-		common_element('span', 'input_instructions', $instructions);
-	}
-	common_element_end('p');
-}
-
-function common_submit($id, $label) {
-	global $xw;
-	common_element_start('p');
-	common_element('input', array('type' => 'submit',
-								  'id' => $id,
-								  'name' => $id,
-								  'class' => 'submit',
-								  'value' => $label));
-	common_element_end('p');
-}
-
-function common_textarea($id, $label, $content=NULL, $instructions=NULL) {
-	common_element_start('p');
-	common_element('label', array('for' => $id), $label);
-	common_element('textarea', array('rows' => 3,
-									 'cols' => 40,
-									 'name' => $id,
-									 'id' => $id),
-				   ($content) ? $content : '');
-	if ($instructions) {
-		common_element('span', 'input_instructions', $instructions);
-	}
-	common_element_end('p');
-}
-
-# salted, hashed passwords are stored in the DB
-
-function common_munge_password($password, $id) {
-	return md5($password . $id);
-}
-
-# check if a username exists and has matching password
-function common_check_user($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'] = $user->id;
-			return true;
-		} else {
-			return false;
-		}
-	}
-	return false;
-}
-
-function common_set_cookie($key, $value, $expiration=0) {
-	$path = common_config('site', 'path');
-	$server = common_config('site', 'server');
-
-	if ($path && ($path != '/')) {
-		$cookiepath = '/' . $path . '/';
-	} else {
-		$cookiepath = '/';
-	}
-	return setcookie($key,
-	                 $value,
-	          		 $expiration,
-			  		 $cookiepath,
-			  	     $server);
+function common_ensure_session()
+{
+    if (!common_have_session()) {
+        @session_start();
+    }
+}
+
+// Three kinds of arguments:
+// 1) a user object
+// 2) a nickname
+// 3) null to clear
+
+// Initialize to false; set to null if none found
+
+$_cur = false;
+
+function common_set_user($user)
+{
+
+    global $_cur;
+
+    if (is_null($user) && common_have_session()) {
+        $_cur = null;
+        unset($_SESSION['userid']);
+        return true;
+    } else if (is_string($user)) {
+        $nickname = $user;
+        $user = User::staticGet('nickname', $nickname);
+    } else if (!($user instanceof User)) {
+        return false;
+    }
+
+    if ($user) {
+        common_ensure_session();
+        $_SESSION['userid'] = $user->id;
+        $_cur = $user;
+        return $_cur;
+    }
+    return false;
+}
+
+function common_set_cookie($key, $value, $expiration=0)
+{
+    $path = common_config('site', 'path');
+    $server = common_config('site', 'server');
+
+    if ($path && ($path != '/')) {
+        $cookiepath = '/' . $path . '/';
+    } else {
+        $cookiepath = '/';
+    }
+    return setcookie($key,
+                     $value,
+                     $expiration,
+                     $cookiepath,
+                     $server);
 }
 
 define('REMEMBERME', 'rememberme');
-define('REMEMBERME_EXPIRY', 30 * 24 * 60 * 60);
-
-function common_rememberme() {
-	$user = common_current_user();
-	if (!$user) {
-		return false;
-	}
-	$rm = new Remember_me();
-	$rm->code = common_good_rand(16);
-	$rm->user_id = $user->id;
-	$result = $rm->insert();
-	if (!$result) {
-		common_log_db_error($rm, 'INSERT', __FILE__);
-		return false;
-	}
-	common_set_cookie(REMEMBERME,
-					  implode(':', array($rm->user_id, $rm->code)),
-					  time() + REMEMBERME_EXPIRY);
-}
-
-function common_remembered_user() {
-	$user = NULL;
-	# Try to remember
-	$packed = $_COOKIE[REMEMBERME];
-	if ($packed) {
-		list($id, $code) = explode(':', $packed);
-		if ($id && $code) {
-			$rm = Remember_me::staticGet($code);
-			if ($rm && ($rm->user_id == $id)) {
-				$user = User::staticGet($rm->user_id);
-				if ($user) {
-					# successful!
-					$result = $rm->delete();
-					if (!$result) {
-						common_log_db_error($rm, 'DELETE', __FILE__);
-						$user = NULL;
-					} else {
-						common_set_user($user->nickname);
-						common_real_login(false);
-						# We issue a new cookie, so they can log in
-						# automatically again after this session
-						common_rememberme();
-					}
-				}
-			}
-		}
-	}
-	return $user;
-}
-
-# must be called with a valid user!
-
-function common_forgetme() {
-	common_set_cookie(REMEMBERME, '', 0);
-}
-
-# who is the current user?
-function common_current_user() {
-	if ($_REQUEST[session_name()]) {
-		common_ensure_session();
-		$id = $_SESSION['userid'];
-		if ($id) {
-			# note: this should cache
-			$user = User::staticGet($id);
-			return $user;
-		}
-	}
-	# that didn't work; try to remember
-	$user = common_remembered_user();
-	return $user;
-}
-
-# Logins that are 'remembered' aren't 'real' -- they're subject to
-# cookie-stealing. So, we don't let them do certain things. New reg,
-# OpenID, and password logins _are_ real.
-
-function common_real_login($real=true) {
-	common_ensure_session();
-	$_SESSION['real_login'] = $real;
-}
-
-function common_is_real_login() {
-	return common_logged_in() && $_SESSION['real_login'];
-}
-
-# get canonical version of nickname for comparison
-function common_canonical_nickname($nickname) {
-	# XXX: UTF-8 canonicalization (like combining chars)
-	return strtolower($nickname);
-}
-
-# get canonical version of email for comparison
-function common_canonical_email($email) {
-	# XXX: canonicalize UTF-8
-	# XXX: lcase the domain part
-	return $email;
+define('REMEMBERME_EXPIRY', 30 * 24 * 60 * 60); // 30 days
+
+function common_rememberme($user=null)
+{
+    if (!$user) {
+        $user = common_current_user();
+        if (!$user) {
+            common_debug('No current user to remember', __FILE__);
+            return false;
+        }
+    }
+
+    $rm = new Remember_me();
+
+    $rm->code = common_good_rand(16);
+    $rm->user_id = $user->id;
+
+    // Wrap the insert in some good ol' fashioned transaction code
+
+    $rm->query('BEGIN');
+
+    $result = $rm->insert();
+
+    if (!$result) {
+        common_log_db_error($rm, 'INSERT', __FILE__);
+        common_debug('Error adding rememberme record for ' . $user->nickname, __FILE__);
+        return false;
+    }
+
+    $rm->query('COMMIT');
+
+    common_debug('Inserted rememberme record (' . $rm->code . ', ' . $rm->user_id . '); result = ' . $result . '.', __FILE__);
+
+    $cookieval = $rm->user_id . ':' . $rm->code;
+
+    common_log(LOG_INFO, 'adding rememberme cookie "' . $cookieval . '" for ' . $user->nickname);
+
+    common_set_cookie(REMEMBERME, $cookieval, time() + REMEMBERME_EXPIRY);
+
+    return true;
+}
+
+function common_remembered_user()
+{
+
+    $user = null;
+
+    $packed = isset($_COOKIE[REMEMBERME]) ? $_COOKIE[REMEMBERME] : null;
+
+    if (!$packed) {
+        return null;
+    }
+
+    list($id, $code) = explode(':', $packed);
+
+    if (!$id || !$code) {
+        common_log(LOG_WARNING, 'Malformed rememberme cookie: ' . $packed);
+        common_forgetme();
+        return null;
+    }
+
+    $rm = Remember_me::staticGet($code);
+
+    if (!$rm) {
+        common_log(LOG_WARNING, 'No such remember code: ' . $code);
+        common_forgetme();
+        return null;
+    }
+
+    if ($rm->user_id != $id) {
+        common_log(LOG_WARNING, 'Rememberme code for wrong user: ' . $rm->user_id . ' != ' . $id);
+        common_forgetme();
+        return null;
+    }
+
+    $user = User::staticGet($rm->user_id);
+
+    if (!$user) {
+        common_log(LOG_WARNING, 'No such user for rememberme: ' . $rm->user_id);
+        common_forgetme();
+        return null;
+    }
+
+    // successful!
+    $result = $rm->delete();
+
+    if (!$result) {
+        common_log_db_error($rm, 'DELETE', __FILE__);
+        common_log(LOG_WARNING, 'Could not delete rememberme: ' . $code);
+        common_forgetme();
+        return null;
+    }
+
+    common_log(LOG_INFO, 'logging in ' . $user->nickname . ' using rememberme code ' . $rm->code);
+
+    common_set_user($user);
+    common_real_login(false);
+
+    // We issue a new cookie, so they can log in
+    // automatically again after this session
+
+    common_rememberme($user);
+
+    return $user;
+}
+
+// must be called with a valid user!
+
+function common_forgetme()
+{
+    common_set_cookie(REMEMBERME, '', 0);
+}
+
+// who is the current user?
+function common_current_user()
+{
+    global $_cur;
+
+    if ($_cur === false) {
+
+        if (isset($_REQUEST[session_name()]) || (isset($_SESSION['userid']) && $_SESSION['userid'])) {
+            common_ensure_session();
+            $id = isset($_SESSION['userid']) ? $_SESSION['userid'] : false;
+            if ($id) {
+                $_cur = User::staticGet($id);
+                return $_cur;
+            }
+        }
+
+        // that didn't work; try to remember; will init $_cur to null on failure
+        $_cur = common_remembered_user();
+
+        if ($_cur) {
+            common_debug("Got User " . $_cur->nickname);
+            common_debug("Faking session on remembered user");
+            // XXX: Is this necessary?
+            $_SESSION['userid'] = $_cur->id;
+        }
+    }
+
+    return $_cur;
+}
+
+// Logins that are 'remembered' aren't 'real' -- they're subject to
+// cookie-stealing. So, we don't let them do certain things. New reg,
+// OpenID, and password logins _are_ real.
+
+function common_real_login($real=true)
+{
+    common_ensure_session();
+    $_SESSION['real_login'] = $real;
+}
+
+function common_is_real_login()
+{
+    return common_logged_in() && $_SESSION['real_login'];
+}
+
+// get canonical version of nickname for comparison
+function common_canonical_nickname($nickname)
+{
+    // XXX: UTF-8 canonicalization (like combining chars)
+    return strtolower($nickname);
+}
+
+// get canonical version of email for comparison
+function common_canonical_email($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);
-	$r = preg_replace('/(^|\s+)@([a-z0-9]{1,64})/e', "'\\1@'.common_at_link($id, '\\2')", $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) {
-			return '<a href="'.htmlspecialchars(common_profile_url($nickname)).'" class="atlink usertouser">'.$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 $nickname;
+function common_render_content($text, $notice)
+{
+    $r = common_render_text($text);
+    $id = $notice->profile_id;
+    $r = preg_replace('/(^|\s+)@([A-Za-z0-9]{1,64})/e', "'\\1@'.common_at_link($id, '\\2')", $r);
+    $r = preg_replace('/^T ([A-Z0-9]{1,64}) /e', "'T '.common_at_link($id, '\\1').' '", $r);
+    $r = preg_replace('/(^|\s+)@#([A-Za-z0-9]{1,64})/e', "'\\1@#'.common_at_hash_link($id, '\\2')", $r);
+    return $r;
+}
+
+function common_render_text($text)
+{
+    $r = htmlspecialchars($text);
+
+    $r = preg_replace('/[\x{0}-\x{8}\x{b}-\x{c}\x{e}-\x{19}]/', '', $r);
+    $r = preg_replace_callback('@https?://[^\]>\s]+@', 'common_render_uri_thingy', $r);
+    $r = preg_replace('/(^|\s+)#([A-Za-z0-9_\-\.]{1,64})/e', "'\\1#'.common_tag_link('\\2')", $r);
+    // XXX: machine tags
+    return $r;
+}
+
+function common_render_uri_thingy($matches)
+{
+    $uri = $matches[0];
+    $trailer = '';
+
+    // Some heuristics for extracting URIs from surrounding punctuation
+    // Strip from trailing text...
+    if (preg_match('/^(.*)([,.:"\']+)$/', $uri, $matches)) {
+        $uri = $matches[1];
+        $trailer = $matches[2];
+    }
+
+    $pairs = array(
+                   ']' => '[', // technically disallowed in URIs, but used in Java docs
+                   ')' => '(', // far too frequent in Wikipedia and MSDN
+                   );
+    $final = substr($uri, -1, 1);
+    if (isset($pairs[$final])) {
+        $openers = substr_count($uri, $pairs[$final]);
+        $closers = substr_count($uri, $final);
+        if ($closers > $openers) {
+            // Assume the paren was opened outside the URI
+            $uri = substr($uri, 0, -1);
+            $trailer = $final . $trailer;
+        }
+    }
+    if ($longurl = common_longurl($uri)) {
+        $longurl = htmlentities($longurl, ENT_QUOTES, 'UTF-8');
+        $title = " title='$longurl'";
+    }
+    else $title = '';
+
+    return '<a href="' . $uri . '"' . $title . ' class="extlink">' . $uri . '</a>' . $trailer;
+}
+
+function common_longurl($short_url)
+{
+    $long_url = common_shorten_link($short_url, true);
+    if ($long_url === $short_url) return false;
+    return $long_url;
+}
+
+function common_longurl2($uri)
+{
+    $uri_e = urlencode($uri);
+    $longurl = unserialize(file_get_contents("http://api.longurl.org/v1/expand?format=php&url=$uri_e"));
+    if (empty($longurl['long_url']) || $uri === $longurl['long_url']) return false;
+    return stripslashes($longurl['long_url']);
+}
+
+function common_shorten_links($text)
+{
+    if (mb_strlen($text) <= 140) return $text;
+    static $cache = array();
+    if (isset($cache[$text])) return $cache[$text];
+    // \s = not a horizontal whitespace character (since PHP 5.2.4)
+    return $cache[$text] = preg_replace('@https?://[^)\]>\s]+@e', "common_shorten_link('\\0')", $text);
+}
+
+function common_shorten_link($url, $reverse = false)
+{
+    static $url_cache = array();
+    if ($reverse) return isset($url_cache[$url]) ? $url_cache[$url] : $url;
+
+    $user = common_current_user();
+
+    $curlh = curl_init();
+    curl_setopt($curlh, CURLOPT_CONNECTTIMEOUT, 20); // # seconds to wait
+    curl_setopt($curlh, CURLOPT_USERAGENT, 'Laconica');
+    curl_setopt($curlh, CURLOPT_RETURNTRANSFER, true);
+
+    switch($user->urlshorteningservice) {
+     case 'ur1.ca':
+        $short_url_service = new LilUrl;
+        $short_url = $short_url_service->shorten($url);
+        break;
+
+     case '2tu.us':
+        $short_url_service = new TightUrl;
+        $short_url = $short_url_service->shorten($url);
+        break;
+
+     case 'ptiturl.com':
+        $short_url_service = new PtitUrl;
+        $short_url = $short_url_service->shorten($url);
+        break;
+
+     case 'bit.ly':
+        curl_setopt($curlh, CURLOPT_URL, 'http://bit.ly/api?method=shorten&long_url='.urlencode($url));
+        $short_url = current(json_decode(curl_exec($curlh))->results)->hashUrl;
+        break;
+
+     case 'is.gd':
+        curl_setopt($curlh, CURLOPT_URL, 'http://is.gd/api.php?longurl='.urlencode($url));
+        $short_url = curl_exec($curlh);
+        break;
+     case 'snipr.com':
+        curl_setopt($curlh, CURLOPT_URL, 'http://snipr.com/site/snip?r=simple&link='.urlencode($url));
+        $short_url = curl_exec($curlh);
+        break;
+     case 'metamark.net':
+        curl_setopt($curlh, CURLOPT_URL, 'http://metamark.net/api/rest/simple?long_url='.urlencode($url));
+        $short_url = curl_exec($curlh);
+        break;
+     case 'tinyurl.com':
+        curl_setopt($curlh, CURLOPT_URL, 'http://tinyurl.com/api-create.php?url='.urlencode($url));
+        $short_url = curl_exec($curlh);
+        break;
+     default:
+        $short_url = false;
+    }
+
+    curl_close($curlh);
+
+    if ($short_url) {
+        $url_cache[(string)$short_url] = $url;
+        return (string)$short_url;
+    }
+    return $url;
+}
+
+function common_xml_safe_str($str)
+{
+    $xmlStr = htmlentities(iconv('UTF-8', 'UTF-8//IGNORE', $str), ENT_NOQUOTES, 'UTF-8');
+
+    // Replace control, formatting, and surrogate characters with '*', ala Twitter
+    return preg_replace('/[\p{Cc}\p{Cf}\p{Cs}]/u', '*', $str);
+}
+
+function common_tag_link($tag)
+{
+    $canonical = common_canonical_tag($tag);
+    $url = common_local_url('tag', array('tag' => $canonical));
+    return '<a href="' . htmlspecialchars($url) . '" rel="tag" class="hashlink">' . htmlspecialchars($tag) . '</a>';
+}
+
+function common_canonical_tag($tag)
+{
+    return strtolower(str_replace(array('-', '_', '.'), '', $tag));
+}
+
+function common_valid_profile_tag($str)
+{
+    return preg_match('/^[A-Za-z0-9_\-\.]{1,64}$/', $str);
+}
+
+function common_at_link($sender_id, $nickname)
+{
+    $sender = Profile::staticGet($sender_id);
+    $recipient = common_relative_profile($sender, common_canonical_nickname($nickname));
+    if ($recipient) {
+        return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink">'.$nickname.'</a>';
+    } else {
+        return $nickname;
+    }
+}
+
+function common_at_hash_link($sender_id, $tag)
+{
+    $user = User::staticGet($sender_id);
+    if (!$user) {
+        return $tag;
+    }
+    $tagged = Profile_tag::getTagged($user->id, common_canonical_tag($tag));
+    if ($tagged) {
+        $url = common_local_url('subscriptions',
+                                array('nickname' => $user->nickname,
+                                      'tag' => $tag));
+        return '<a href="'.htmlspecialchars($url).'" class="atlink">'.$tag.'</a>';
+    } else {
+        return $tag;
+    }
+}
+
+function common_relative_profile($sender, $nickname, $dt=null)
+{
+    // Try to find profiles this profile is subscribed to that have this nickname
+    $recipient = new Profile();
+    // XXX: use a join instead of a subquery
+    $recipient->whereAdd('EXISTS (SELECT subscribed from subscription where subscriber = '.$sender->id.' and subscribed = id)', 'AND');
+    $recipient->whereAdd('nickname = "' . trim($nickname) . '"', 'AND');
+    if ($recipient->find(true)) {
+        // XXX: should probably differentiate between profiles with
+        // the same name by date of most recent update
+        return $recipient;
+    }
+    // Try to find profiles that listen to this profile and that have this nickname
+    $recipient = new Profile();
+    // XXX: use a join instead of a subquery
+    $recipient->whereAdd('EXISTS (SELECT subscriber from subscription where subscribed = '.$sender->id.' and subscriber = id)', 'AND');
+    $recipient->whereAdd('nickname = "' . trim($nickname) . '"', 'AND');
+    if ($recipient->find(true)) {
+        // XXX: should probably differentiate between profiles with
+        // the same name by date of most recent update
+        return $recipient;
+    }
+    // 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) {
+            return $recipient_user->getProfile();
+        }
+    }
+    // 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 null;
 }
 
 // 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/'.$filename);
-}
-
-function common_avatar_display_url($avatar) {
-	$server = common_config('avatar', 'server');
-	if ($server) {
-		return 'http://'.$server.'/'.$avatar->filename;
-	} else {
-		return $avatar->url;
-	}
-}
-
-function common_default_avatar($size) {
-	static $sizenames = array(AVATAR_PROFILE_SIZE => 'profile',
-							  AVATAR_STREAM_SIZE => 'stream',
-							  AVATAR_MINI_SIZE => 'mini');
-	return theme_path('default-avatar-'.$sizenames[$size].'.png');
-}
-
-function common_local_url($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':
-		if ($args && $args['page']) {
-			return common_path('?page=' . $args['page']);
-		} else {
-			return common_path('');
-		}
-	 case 'publicrss':
-		return common_path('rss');
-	 case 'publicxrds':
-		return common_path('xrds');
-	 case 'doc':
-		return common_path('doc/'.$args['title']);
-	 case 'login':
-	 case 'logout':
-	 case 'register':
-	 case 'subscribe':
-	 case 'unsubscribe':
-		return common_path('main/'.$action);
-	 case 'remotesubscribe':
-		if ($args && $args['nickname']) {
-			return common_path('main/remote?nickname=' . $args['nickname']);
-		} else {
-			return common_path('main/remote');
-		}
-	 case 'openidlogin':
-		return common_path('main/openid');
-	 case 'avatar':
-	 case 'password':
-		return common_path('settings/'.$action);
-	 case 'profilesettings':
-		return common_path('settings/profile');
-	 case 'openidsettings':
-		return common_path('settings/openid');
-	 case 'newnotice':
-		return common_path('notice/new');
-	 case 'shownotice':
-		return common_path('notice/'.$args['notice']);
-	 case 'xrds':
-	 case 'foaf':
-		return common_path($args['nickname'].'/'.$action);
-	 case 'subscriptions':
-	 case 'subscribers':
-	 case 'all':
-		if ($args && $args['page']) {
-			return common_path($args['nickname'].'/'.$action.'?page=' . $args['page']);
-		} else {
-			return common_path($args['nickname'].'/'.$action);
-		}
-	 case 'allrss':
-		return common_path($args['nickname'].'/all/rss');
-	 case 'userrss':
-		return common_path($args['nickname'].'/rss');
-	 case 'showstream':
-		if ($args && $args['page']) {
-			return common_path($args['nickname'].'?page=' . $args['page']);
-		} else {
-			return common_path($args['nickname']);
-		}
-	 case 'confirmaddress':
-		return common_path('main/confirmaddress/'.$args['code']);
-	 case 'userbyid':
-	 	return common_path('user/'.$args['id']);
-	 case 'recoverpassword':
-	    $path = 'main/recoverpassword';
-	    if ($args['code']) {
-	    	$path .= '/' . $args['code'];
-		}
-	    return common_path($path);
-	 case 'imsettings':
-	 	return common_path('settings/im');
-	 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);
-	$t = strtotime($dt);
-	$now = time();
-	$diff = $now - $t;
-
-	if ($now < $t) { # that shouldn't happen!
-		return common_exact_date($dt);
-	} else if ($diff < 60) {
-		return _t('a few seconds ago');
-	} else if ($diff < 92) {
-		return _t('about a minute ago');
-	} else if ($diff < 3300) {
-		return _t('about ') . round($diff/60) . _t(' minutes ago');
-	} else if ($diff < 5400) {
-		return _t('about an hour ago');
-	} else if ($diff < 22 * 3600) {
-		return _t('about ') . round($diff/3600) . _t(' hours ago');
-	} else if ($diff < 37 * 3600) {
-		return _t('about a day ago');
-	} else if ($diff < 24 * 24 * 3600) {
-		return _t('about ') . round($diff/(24*3600)) . _t(' days ago');
-	} else if ($diff < 46 * 24 * 3600) {
-		return _t('about a month ago');
-	} else if ($diff < 330 * 24 * 3600) {
-		return _t('about ') . round($diff/(30*24*3600)) . _t(' months ago');
-	} else if ($diff < 480 * 24 * 3600) {
-		return _t('about a year ago');
-	} else {
-		return common_exact_date($dt);
-	}
-}
-
-function common_exact_date($dt) {
-	$t = strtotime($dt);
-	return date(DATE_RFC850, $t);
-}
-
-function common_date_w3dtf($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_start_xml('a',
-					 '-//W3C//DTD XHTML 1.0 Strict//EN',
-					 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd');
-	common_element('a', array('href' => $url), $url);
-	common_end_xml();
-}
-
-function common_broadcast_notice($notice, $remote=false) {
-	if (common_config('queue', 'enabled')) {
-		# Do it later!
-		common_enqueue_notice($notice);
-	} else {
-		common_real_broadcast($notice, $remote);
-	}
-}
-
-# Stick the notice on the queue
-
-function common_enqueue_notice($notice) {
-	$qi = new Queue_item();
-	$qi->notice_id = $notice->id;
-	$qi->created = DB_DataObject_Cast::dateTime();
-	$result = $qi->insert();
-	return $result;
-}
-	  
-function common_real_broadcast($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($notice);
-	}
-	require_once(INSTALLDIR.'/lib/jabber.php');
-	jabber_broadcast_notice($notice);
-	// XXX: broadcast notices to SMS
-	// XXX: broadcast notices to other IM
-	return true;
-}
-
-function common_broadcast_profile($profile) {
-	// XXX: optionally use a queue system like http://code.google.com/p/microapps/wiki/NQDQ
-	require_once(INSTALLDIR.'/lib/omb.php');
-	omb_broadcast_profile($profile);
-	// XXX: Other broadcasts...?
-	return true;
-}
-
-function common_profile_url($nickname) {
-	return common_local_url('showstream', array('nickname' => $nickname));
-}
-
-# Don't call if nobody's logged in
-
-function common_notice_form($action=NULL, $content=NULL) {
-	$user = common_current_user();
-	assert(!is_null($user));
-	common_element_start('form', array('id' => 'status_form',
-									   'method' => 'post',
-									   'action' => common_local_url('newnotice')));
-	common_element_start('p');
-	common_element('label', array('for' => 'status_textarea',
-								  'id' => 'status_label'),
-				   _t('What\'s up, ').$user->nickname.'?');
-        common_element('span', array('id' => 'counter', 'class' => 'counter'), '140');
-	common_element('textarea', array('id' => 'status_textarea',
-									 'cols' => 60,
-									 'rows' => 3,
-									 'name' => 'status_textarea'),
-				   ($content) ? $content : '');
-	if ($action) {
-		common_hidden('returnto', $action);
-	}
-	common_element('input', array('id' => 'status_submit',
-								  'name' => 'status_submit',
-								  'type' => 'submit',
-								  'value' => _t('Send')));
-	common_element_end('p');
-	common_element_end('form');
+function common_avatar_filename($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/'.$filename);
+}
+
+function common_avatar_display_url($avatar)
+{
+    $server = common_config('avatar', 'server');
+    if ($server) {
+        return 'http://'.$server.'/'.$avatar->filename;
+    } else {
+        return $avatar->url;
+    }
+}
+
+function common_default_avatar($size)
+{
+    static $sizenames = array(AVATAR_PROFILE_SIZE => 'profile',
+                              AVATAR_STREAM_SIZE => 'stream',
+                              AVATAR_MINI_SIZE => 'mini');
+    return theme_path('default-avatar-'.$sizenames[$size].'.png');
+}
+
+function common_local_url($action, $args=null, $fragment=null)
+{
+    $url = null;
+    if (common_config('site','fancy')) {
+        $url = common_fancy_url($action, $args);
+    } else {
+        $url = common_simple_url($action, $args);
+    }
+    if (!is_null($fragment)) {
+        $url .= '#'.$fragment;
+    }
+    return $url;
+}
+
+function common_fancy_url($action, $args=null)
+{
+    switch (strtolower($action)) {
+     case 'public':
+        if ($args && isset($args['page'])) {
+            return common_path('?page=' . $args['page']);
+        } else {
+            return common_path('');
+        }
+     case 'featured':
+        if ($args && isset($args['page'])) {
+            return common_path('featured?page=' . $args['page']);
+        } else {
+            return common_path('featured');
+        }
+     case 'favorited':
+        if ($args && isset($args['page'])) {
+            return common_path('favorited?page=' . $args['page']);
+        } else {
+            return common_path('favorited');
+        }
+     case 'publicrss':
+        return common_path('rss');
+     case 'publicatom':
+        return common_path("api/statuses/public_timeline.atom");
+     case 'publicxrds':
+        return common_path('xrds');
+     case 'featuredrss':
+        return common_path('featuredrss');
+     case 'favoritedrss':
+        return common_path('favoritedrss');
+     case 'opensearch':
+        if ($args && $args['type']) {
+            return common_path('opensearch/'.$args['type']);
+        } else {
+            return common_path('opensearch/people');
+        }
+     case 'doc':
+        return common_path('doc/'.$args['title']);
+     case 'block':
+     case 'login':
+     case 'logout':
+     case 'subscribe':
+     case 'unsubscribe':
+     case 'invite':
+        return common_path('main/'.$action);
+     case 'tagother':
+        return common_path('main/tagother?id='.$args['id']);
+     case 'register':
+        if ($args && $args['code']) {
+            return common_path('main/register/'.$args['code']);
+        } else {
+            return common_path('main/register');
+        }
+     case 'remotesubscribe':
+        if ($args && $args['nickname']) {
+            return common_path('main/remote?nickname=' . $args['nickname']);
+        } else {
+            return common_path('main/remote');
+        }
+     case 'nudge':
+        return common_path($args['nickname'].'/nudge');
+     case 'openidlogin':
+        return common_path('main/openid');
+     case 'profilesettings':
+        return common_path('settings/profile');
+     case 'emailsettings':
+        return common_path('settings/email');
+     case 'openidsettings':
+        return common_path('settings/openid');
+     case 'smssettings':
+        return common_path('settings/sms');
+     case 'twittersettings':
+        return common_path('settings/twitter');
+     case 'othersettings':
+        return common_path('settings/other');
+     case 'deleteprofile':
+        return common_path('settings/delete');
+     case 'newnotice':
+        if ($args && $args['replyto']) {
+            return common_path('notice/new?replyto='.$args['replyto']);
+        } else {
+            return common_path('notice/new');
+        }
+     case 'shownotice':
+        return common_path('notice/'.$args['notice']);
+     case 'deletenotice':
+        if ($args && $args['notice']) {
+            return common_path('notice/delete/'.$args['notice']);
+        } else {
+            return common_path('notice/delete');
+        }
+     case 'microsummary':
+     case 'xrds':
+     case 'foaf':
+        return common_path($args['nickname'].'/'.$action);
+     case 'all':
+     case 'replies':
+     case 'inbox':
+     case 'outbox':
+        if ($args && isset($args['page'])) {
+            return common_path($args['nickname'].'/'.$action.'?page=' . $args['page']);
+        } else {
+            return common_path($args['nickname'].'/'.$action);
+        }
+     case 'subscriptions':
+     case 'subscribers':
+        $nickname = $args['nickname'];
+        unset($args['nickname']);
+        if (isset($args['tag'])) {
+            $tag = $args['tag'];
+            unset($args['tag']);
+        }
+        $params = http_build_query($args);
+        if ($params) {
+            return common_path($nickname.'/'.$action . (($tag) ? '/' . $tag : '') . '?' . $params);
+        } else {
+            return common_path($nickname.'/'.$action . (($tag) ? '/' . $tag : ''));
+        }
+     case 'allrss':
+        return common_path($args['nickname'].'/all/rss');
+     case 'repliesrss':
+        return common_path($args['nickname'].'/replies/rss');
+     case 'userrss':
+        if (isset($args['limit']))
+          return common_path($args['nickname'].'/rss?limit=' . $args['limit']);
+        return common_path($args['nickname'].'/rss');
+     case 'showstream':
+        if ($args && isset($args['page'])) {
+            return common_path($args['nickname'].'?page=' . $args['page']);
+        } else {
+            return common_path($args['nickname']);
+        }
+
+     case 'usertimeline':
+        return common_path("api/statuses/user_timeline/".$args['nickname'].".atom");
+     case 'confirmaddress':
+        return common_path('main/confirmaddress/'.$args['code']);
+     case 'userbyid':
+        return common_path('user/'.$args['id']);
+     case 'recoverpassword':
+        $path = 'main/recoverpassword';
+        if ($args['code']) {
+            $path .= '/' . $args['code'];
+        }
+        return common_path($path);
+     case 'imsettings':
+        return common_path('settings/im');
+     case 'peoplesearch':
+        return common_path('search/people' . (($args) ? ('?' . http_build_query($args)) : ''));
+     case 'noticesearch':
+        return common_path('search/notice' . (($args) ? ('?' . http_build_query($args)) : ''));
+     case 'noticesearchrss':
+        return common_path('search/notice/rss' . (($args) ? ('?' . http_build_query($args)) : ''));
+     case 'avatarbynickname':
+        return common_path($args['nickname'].'/avatar/'.$args['size']);
+     case 'tag':
+        if (isset($args['tag']) && $args['tag']) {
+            $path = 'tag/' . $args['tag'];
+            unset($args['tag']);
+        } else {
+            $path = 'tags';
+        }
+        return common_path($path . (($args) ? ('?' . http_build_query($args)) : ''));
+     case 'peopletag':
+        $path = 'peopletag/' . $args['tag'];
+        unset($args['tag']);
+        return common_path($path . (($args) ? ('?' . http_build_query($args)) : ''));
+     case 'tags':
+        return common_path('tags' . (($args) ? ('?' . http_build_query($args)) : ''));
+     case 'favor':
+        return common_path('main/favor');
+     case 'disfavor':
+        return common_path('main/disfavor');
+     case 'showfavorites':
+        if ($args && isset($args['page'])) {
+            return common_path($args['nickname'].'/favorites?page=' . $args['page']);
+        } else {
+            return common_path($args['nickname'].'/favorites');
+        }
+     case 'favoritesrss':
+        return common_path($args['nickname'].'/favorites/rss');
+     case 'showmessage':
+        return common_path('message/' . $args['message']);
+     case 'newmessage':
+        return common_path('message/new' . (($args) ? ('?' . http_build_query($args)) : ''));
+     case 'api':
+        // XXX: do fancy URLs for all the API methods
+        switch (strtolower($args['apiaction'])) {
+         case 'statuses':
+            switch (strtolower($args['method'])) {
+             case 'user_timeline.rss':
+                return common_path('api/statuses/user_timeline/'.$args['argument'].'.rss');
+             case 'user_timeline.atom':
+                return common_path('api/statuses/user_timeline/'.$args['argument'].'.atom');
+             case 'user_timeline.json':
+                return common_path('api/statuses/user_timeline/'.$args['argument'].'.json');
+             case 'user_timeline.xml':
+                return common_path('api/statuses/user_timeline/'.$args['argument'].'.xml');
+             default: return common_simple_url($action, $args);
+            }
+         default: return common_simple_url($action, $args);
+        }
+     case 'sup':
+        if ($args && isset($args['seconds'])) {
+            return common_path('main/sup?seconds='.$args['seconds']);
+        } else {
+            return common_path('main/sup');
+        }
+     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);
+    $t = strtotime($dt);
+    $now = time();
+    $diff = $now - $t;
+
+    if ($now < $t) { // that shouldn't happen!
+        return common_exact_date($dt);
+    } else if ($diff < 60) {
+        return _('a few seconds ago');
+    } else if ($diff < 92) {
+        return _('about a minute ago');
+    } else if ($diff < 3300) {
+        return sprintf(_('about %d minutes ago'), round($diff/60));
+    } else if ($diff < 5400) {
+        return _('about an hour ago');
+    } else if ($diff < 22 * 3600) {
+        return sprintf(_('about %d hours ago'), round($diff/3600));
+    } else if ($diff < 37 * 3600) {
+        return _('about a day ago');
+    } else if ($diff < 24 * 24 * 3600) {
+        return sprintf(_('about %d days ago'), round($diff/(24*3600)));
+    } else if ($diff < 46 * 24 * 3600) {
+        return _('about a month ago');
+    } else if ($diff < 330 * 24 * 3600) {
+        return sprintf(_('about %d months ago'), round($diff/(30*24*3600)));
+    } else if ($diff < 480 * 24 * 3600) {
+        return _('about a year ago');
+    } else {
+        return common_exact_date($dt);
+    }
+}
+
+function common_exact_date($dt)
+{
+    static $_utc;
+    static $_siteTz;
+
+    if (!$_utc) {
+        $_utc = new DateTimeZone('UTC');
+        $_siteTz = new DateTimeZone(common_timezone());
+    }
+
+    $dateStr = date('d F Y H:i:s', strtotime($dt));
+    $d = new DateTime($dateStr, $_utc);
+    $d->setTimezone($_siteTz);
+    return $d->format(DATE_RFC850);
+}
+
+function common_date_w3dtf($dt)
+{
+    $dateStr = date('d F Y H:i:s', strtotime($dt));
+    $d = new DateTime($dateStr, new DateTimeZone('UTC'));
+    $d->setTimezone(new DateTimeZone(common_timezone()));
+    return $d->format(DATE_W3C);
+}
+
+function common_date_rfc2822($dt)
+{
+    $dateStr = date('d F Y H:i:s', strtotime($dt));
+    $d = new DateTime($dateStr, new DateTimeZone('UTC'));
+    $d->setTimezone(new DateTimeZone(common_timezone()));
+    return $d->format('r');
+}
+
+function common_date_iso8601($dt)
+{
+    $dateStr = date('d F Y H:i:s', strtotime($dt));
+    $d = new DateTime($dateStr, new DateTimeZone('UTC'));
+    $d->setTimezone(new DateTimeZone(common_timezone()));
+    return $d->format('c');
 }
 
-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_sql_now()
+{
+    return strftime('%Y-%m-%d %H:%M:%S', time());
 }
 
-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 $enc;
+function common_redirect($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_start_xml('a',
+                     '-//W3C//DTD XHTML 1.0 Strict//EN',
+                     'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd');
+    common_element('a', array('href' => $url), $url);
+    common_end_xml();
+    exit;
+}
+
+function common_save_replies($notice)
+{
+    // Alternative reply format
+    $tname = false;
+    if (preg_match('/^T ([A-Z0-9]{1,64}) /', $notice->content, $match)) {
+        $tname = $match[1];
+    }
+    // extract all @messages
+    $cnt = preg_match_all('/(?:^|\s)@([a-z0-9]{1,64})/', $notice->content, $match);
+
+    $names = array();
+
+    if ($cnt || $tname) {
+        // XXX: is there another way to make an array copy?
+        $names = ($tname) ? array_unique(array_merge(array(strtolower($tname)), $match[1])) : array_unique($match[1]);
+    }
+
+    $sender = Profile::staticGet($notice->profile_id);
+
+    $replied = array();
+
+    // store replied only for first @ (what user/notice what the reply directed,
+    // we assume first @ is it)
+
+    for ($i=0; $i<count($names); $i++) {
+        $nickname = $names[$i];
+        $recipient = common_relative_profile($sender, $nickname, $notice->created);
+        if (!$recipient) {
+            continue;
+        }
+        if ($i == 0 && ($recipient->id != $sender->id) && !$notice->reply_to) { // Don't save reply to self
+            $reply_for = $recipient;
+            $recipient_notice = $reply_for->getCurrentNotice();
+            if ($recipient_notice) {
+                $orig = clone($notice);
+                $notice->reply_to = $recipient_notice->id;
+                $notice->update($orig);
+            }
+        }
+        // Don't save replies from blocked profile to local user
+        $recipient_user = User::staticGet('id', $recipient->id);
+        if ($recipient_user && $recipient_user->hasBlocked($sender)) {
+            continue;
+        }
+        $reply = new Reply();
+        $reply->notice_id = $notice->id;
+        $reply->profile_id = $recipient->id;
+        $id = $reply->insert();
+        if (!$id) {
+            $last_error = &PEAR::getStaticProperty('DB_DataObject','lastError');
+            common_log(LOG_ERR, 'DB error inserting reply: ' . $last_error->message);
+            common_server_error(sprintf(_('DB error inserting reply: %s'), $last_error->message));
+            return;
+        } else {
+            $replied[$recipient->id] = 1;
+        }
+    }
+
+    // Hash format replies, too
+    $cnt = preg_match_all('/(?:^|\s)@#([a-z0-9]{1,64})/', $notice->content, $match);
+    if ($cnt) {
+        foreach ($match[1] as $tag) {
+            $tagged = Profile_tag::getTagged($sender->id, $tag);
+            foreach ($tagged as $t) {
+                if (!$replied[$t->id]) {
+                    // Don't save replies from blocked profile to local user
+                    $t_user = User::staticGet('id', $t->id);
+                    if ($t_user && $t_user->hasBlocked($sender)) {
+                        continue;
+                    }
+                    $reply = new Reply();
+                    $reply->notice_id = $notice->id;
+                    $reply->profile_id = $t->id;
+                    $id = $reply->insert();
+                    if (!$id) {
+                        common_log_db_error($reply, 'INSERT', __FILE__);
+                        return;
+                    }
+                }
+            }
+        }
+    }
+}
+
+function common_broadcast_notice($notice, $remote=false)
+{
+
+    // Check to see if notice should go to Twitter
+    $flink = Foreign_link::getByUserID($notice->profile_id, 1); // 1 == Twitter
+    if (($flink->noticesync & FOREIGN_NOTICE_SEND) == FOREIGN_NOTICE_SEND) {
+
+        // If it's not a Twitter-style reply, or if the user WANTS to send replies...
+
+        if (!preg_match('/^@[a-zA-Z0-9_]{1,15}\b/u', $notice->content) ||
+            (($flink->noticesync & FOREIGN_NOTICE_SEND_REPLY) == FOREIGN_NOTICE_SEND_REPLY)) {
+
+            $result = common_twitter_broadcast($notice, $flink);
+
+            if (!$result) {
+                common_debug('Unable to send notice: ' . $notice->id . ' to Twitter.', __FILE__);
+            }
+        }
+    }
+
+    if (common_config('queue', 'enabled')) {
+        // Do it later!
+        return common_enqueue_notice($notice);
+    } else {
+        return common_real_broadcast($notice, $remote);
+    }
 }
 
-function common_mtrand($bytes) {
-	$enc = '';
-	for ($i = 0; $i < $bytes; $i++) {
-		$enc .= sprintf("%02x", mt_rand(0, 255));
-	}
-	return $enc;
+function common_twitter_broadcast($notice, $flink)
+{
+    global $config;
+    $success = true;
+    $fuser = $flink->getForeignUser();
+    $twitter_user = $fuser->nickname;
+    $twitter_password = $flink->credentials;
+    $uri = 'http://www.twitter.com/statuses/update.json';
+
+    // XXX: Hack to get around PHP cURL's use of @ being a a meta character
+    $statustxt = preg_replace('/^@/', ' @', $notice->content);
+
+    $options = array(
+                     CURLOPT_USERPWD         => "$twitter_user:$twitter_password",
+                     CURLOPT_POST            => true,
+                     CURLOPT_POSTFIELDS        => array(
+                                                        'status'    => $statustxt,
+                                                        'source'    => $config['integration']['source']
+                                                        ),
+                     CURLOPT_RETURNTRANSFER    => true,
+                     CURLOPT_FAILONERROR        => true,
+                     CURLOPT_HEADER            => false,
+                     CURLOPT_FOLLOWLOCATION    => true,
+                     CURLOPT_USERAGENT        => "Laconica",
+                     CURLOPT_CONNECTTIMEOUT    => 120,  // XXX: Scary!!!! How long should this be?
+                     CURLOPT_TIMEOUT            => 120,
+
+                     # Twitter is strict about accepting invalid "Expect" headers
+                     CURLOPT_HTTPHEADER => array('Expect:')
+                     );
+
+    $ch = curl_init($uri);
+    curl_setopt_array($ch, $options);
+    $data = curl_exec($ch);
+    $errmsg = curl_error($ch);
+
+    if ($errmsg) {
+        common_debug("cURL error: $errmsg - trying to send notice for $twitter_user.",
+                     __FILE__);
+        $success = false;
+    }
+
+    curl_close($ch);
+
+    if (!$data) {
+        common_debug("No data returned by Twitter's API trying to send update for $twitter_user",
+                     __FILE__);
+        $success = false;
+    }
+
+    // Twitter should return a status
+    $status = json_decode($data);
+
+    if (!$status->id) {
+        common_debug("Unexpected data returned by Twitter API trying to send update for $twitter_user",
+                     __FILE__);
+        $success = false;
+    }
+
+    return $success;
+}
+
+// Stick the notice on the queue
+
+function common_enqueue_notice($notice)
+{
+    foreach (array('jabber', 'omb', 'sms', 'public') as $transport) {
+        $qi = new Queue_item();
+        $qi->notice_id = $notice->id;
+        $qi->transport = $transport;
+        $qi->created = $notice->created;
+        $result = $qi->insert();
+        if (!$result) {
+            $last_error = &PEAR::getStaticProperty('DB_DataObject','lastError');
+            common_log(LOG_ERR, 'DB error inserting queue item: ' . $last_error->message);
+            return false;
+        }
+        common_log(LOG_DEBUG, 'complete queueing notice ID = ' . $notice->id . ' for ' . $transport);
+    }
+    return $result;
+}
+
+function common_dequeue_notice($notice)
+{
+    $qi = Queue_item::staticGet($notice->id);
+    if ($qi) {
+        $result = $qi->delete();
+        if (!$result) {
+            $last_error = &PEAR::getStaticProperty('DB_DataObject','lastError');
+            common_log(LOG_ERR, 'DB error deleting queue item: ' . $last_error->message);
+            return false;
+        }
+        common_log(LOG_DEBUG, 'complete dequeueing notice ID = ' . $notice->id);
+        return $result;
+    } else {
+        return false;
+    }
+}
+
+function common_real_broadcast($notice, $remote=false)
+{
+    $success = true;
+    if (!$remote) {
+        // Make sure we have the OMB stuff
+        require_once(INSTALLDIR.'/lib/omb.php');
+        $success = omb_broadcast_remote_subscribers($notice);
+        if (!$success) {
+            common_log(LOG_ERR, 'Error in OMB broadcast for notice ' . $notice->id);
+        }
+    }
+    if ($success) {
+        require_once(INSTALLDIR.'/lib/jabber.php');
+        $success = jabber_broadcast_notice($notice);
+        if (!$success) {
+            common_log(LOG_ERR, 'Error in jabber broadcast for notice ' . $notice->id);
+        }
+    }
+    if ($success) {
+        require_once(INSTALLDIR.'/lib/mail.php');
+        $success = mail_broadcast_notice_sms($notice);
+        if (!$success) {
+            common_log(LOG_ERR, 'Error in sms broadcast for notice ' . $notice->id);
+        }
+    }
+    if ($success) {
+        $success = jabber_public_notice($notice);
+        if (!$success) {
+            common_log(LOG_ERR, 'Error in public broadcast for notice ' . $notice->id);
+        }
+    }
+    // XXX: broadcast notices to other IM
+    return $success;
+}
+
+function common_broadcast_profile($profile)
+{
+    // XXX: optionally use a queue system like http://code.google.com/p/microapps/wiki/NQDQ
+    require_once(INSTALLDIR.'/lib/omb.php');
+    omb_broadcast_profile($profile);
+    // XXX: Other broadcasts...?
+    return true;
 }
-
-function common_set_returnto($url) {
-	common_ensure_session();
-	$_SESSION['returnto'] = $url;
+
+function common_profile_url($nickname)
+{
+    return common_local_url('showstream', array('nickname' => $nickname));
 }
 
-function common_get_returnto() {
-	common_ensure_session();
-	return $_SESSION['returnto'];
+// Don't call if nobody's logged in
+
+function common_notice_form($action=null, $content=null)
+{
+    $user = common_current_user();
+    assert(!is_null($user));
+    common_element_start('form', array('id' => 'status_form',
+                                       'method' => 'post',
+                                       'action' => common_local_url('newnotice')));
+    common_element_start('p');
+    common_element('label', array('for' => 'status_textarea',
+                                  'id' => 'status_label'),
+                   sprintf(_('What\'s up, %s?'), $user->nickname));
+    common_element('span', array('id' => 'counter', 'class' => 'counter'), '140');
+    common_element('textarea', array('id' => 'status_textarea',
+                                     'cols' => 60,
+                                     'rows' => 3,
+                                     'name' => 'status_textarea'),
+                   ($content) ? $content : '');
+    common_hidden('token', common_session_token());
+    if ($action) {
+        common_hidden('returnto', $action);
+    }
+    // set by JavaScript
+    common_hidden('inreplyto', 'false');
+    common_element('input', array('id' => 'status_submit',
+                                  'name' => 'status_submit',
+                                  'type' => 'submit',
+                                  'value' => _('Send')));
+    common_element_end('p');
+    common_element_end('form');
+}
+
+// Should make up a reasonable root URL
+
+function common_root_url()
+{
+    return common_path('');
 }
 
-function common_timestamp() {
-	return date('YmdHis');
+// 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);
+    }
 }
 
-// XXX: set up gettext
+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 _t($str) {
-	return $str;
+function common_set_returnto($url)
+{
+    common_ensure_session();
+    $_SESSION['returnto'] = $url;
 }
 
-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_get_returnto()
+{
+    common_ensure_session();
+    return $_SESSION['returnto'];
 }
 
-function common_log($priority, $msg, $filename=NULL) {
-	common_ensure_syslog();
-	syslog($priority, $msg);
+function common_timestamp()
+{
+    return date('YmdHis');
 }
 
-function common_debug($msg, $filename=NULL) {
-	if ($filename) {
-		common_log(LOG_DEBUG, basename($filename).' - '.$msg);
-	} else {
-		common_log(LOG_DEBUG, $msg);
-	}
+function common_ensure_syslog()
+{
+    static $initialized = false;
+    if (!$initialized) {
+        global $config;
+        openlog($config['syslog']['appname'], 0, LOG_USER);
+        $initialized = true;
+    }
 }
 
-function common_log_db_error(&$object, $verb, $filename=NULL) {
-	$objstr = common_log_objstring($object);
-	$last_error = &PEAR::getStaticProperty('DB_DataObject','lastError');
-	common_log(LOG_ERROR, $last_error->message . '(' . $verb . ' on ' . $objstr . ')', $filename);
+function common_log($priority, $msg, $filename=null)
+{
+    $logfile = common_config('site', 'logfile');
+    if ($logfile) {
+        $log = fopen($logfile, "a");
+        if ($log) {
+            static $syslog_priorities = array('LOG_EMERG', 'LOG_ALERT', 'LOG_CRIT', 'LOG_ERR',
+                                              'LOG_WARNING', 'LOG_NOTICE', 'LOG_INFO', 'LOG_DEBUG');
+            $output = date('Y-m-d H:i:s') . ' ' . $syslog_priorities[$priority] . ': ' . $msg . "\n";
+            fwrite($log, $output);
+            fclose($log);
+        }
+    } else {
+        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_log_objstring(&$object) {
-	if (is_null($object)) {
-		return "NULL";
-	}
-	$arr = $object->toArray();
-	$fields = array();
-	foreach ($arr as $k => $v) {
-		$fields[] = "$k='$v'";
-	}
-	$objstring = $object->tableName() . '[' . implode(',', $fields) . ']';
-	return $objstring;
+function common_log_db_error(&$object, $verb, $filename=null)
+{
+    $objstr = common_log_objstring($object);
+    $last_error = &PEAR::getStaticProperty('DB_DataObject','lastError');
+    common_log(LOG_ERR, $last_error->message . '(' . $verb . ' on ' . $objstr . ')', $filename);
 }
 
-function common_valid_http_url($url) {
-	return Validate::uri($url, array('allowed_schemes' => array('http', 'https')));
+function common_log_objstring(&$object)
+{
+    if (is_null($object)) {
+        return "null";
+    }
+    $arr = $object->toArray();
+    $fields = array();
+    foreach ($arr as $k => $v) {
+        $fields[] = "$k='$v'";
+    }
+    $objstring = $object->tableName() . '[' . implode(',', $fields) . ']';
+    return $objstring;
+}
+
+function common_valid_http_url($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-\.]+)$/', $matches[1]));
-	}
-	return false;
+function common_valid_tag($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
+// Does a little before-after block for next/prev page
 
-function common_pagination($have_before, $have_after, $page, $action, $args=NULL) {
+function common_pagination($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 || $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) : $pargs;
+    if ($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, $newargs)),
-					   _t('« After'));
-		common_element_end('li');
-	}
+        common_element_start('li', 'before');
+        common_element('a', array('href' => common_local_url($action, $newargs), 'rel' => 'prev'),
+                       _('« After'));
+        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, $newargs)),
-						   _t('Before »'));
-		common_element_end('li');
-	}
+    if ($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), 'rel' => 'next'),
+                       _('Before »'));
+        common_element_end('li');
+    }
 
-	if ($have_before || $have_after) {
-		common_element_end('ul');
-		common_element_end('div');
-	}
+    if ($have_before || $have_after) {
+        common_element_end('ul');
+        common_element_end('div');
+    }
 }
 
 /* Following functions are copied from MediaWiki GlobalFunctions.php
  * and written by Evan Prodromou. */
 
-function common_accept_to_prefs($accept, $def = '*/*') {
-	# No arg means accept anything (per HTTP spec)
-	if(!$accept) {
-		return array($def => 1);
-	}
-
-	$prefs = array();
-
-	$parts = explode(',', $accept);
-
-	foreach($parts as $part) {
-		# FIXME: doesn't deal with params like 'text/html; level=1'
-		@list($value, $qpart) = explode(';', $part);
-		$match = array();
-		if(!isset($qpart)) {
-			$prefs[$value] = 1;
-		} elseif(preg_match('/q\s*=\s*(\d*\.\d+)/', $qpart, $match)) {
-			$prefs[$value] = $match[1];
-		}
-	}
-
-	return $prefs;
-}
-
-function common_mime_type_match($type, $avail) {
-	if(array_key_exists($type, $avail)) {
-		return $type;
-	} else {
-		$parts = explode('/', $type);
-		if(array_key_exists($parts[0] . '/*', $avail)) {
-			return $parts[0] . '/*';
-		} elseif(array_key_exists('*/*', $avail)) {
-			return '*/*';
-		} else {
-			return NULL;
-		}
-	}
-}
-
-function common_negotiate_type($cprefs, $sprefs) {
-	$combine = array();
-
-	foreach(array_keys($sprefs) as $type) {
-		$parts = explode('/', $type);
-		if($parts[1] != '*') {
-			$ckey = common_mime_type_match($type, $cprefs);
-			if($ckey) {
-				$combine[$type] = $sprefs[$type] * $cprefs[$ckey];
-			}
-		}
-	}
-
-	foreach(array_keys($cprefs) as $type) {
-		$parts = explode('/', $type);
-		if($parts[1] != '*' && !array_key_exists($type, $sprefs)) {
-			$skey = common_mime_type_match($type, $sprefs);
-			if($skey) {
-				$combine[$type] = $sprefs[$skey] * $cprefs[$type];
-			}
-		}
-	}
-
-	$bestq = 0;
-	$besttype = "text/html";
-
-	foreach(array_keys($combine) as $type) {
-		if($combine[$type] > $bestq) {
-			$besttype = $type;
-			$bestq = $combine[$type];
-		}
-	}
-
-	return $besttype;
-}
-
-function common_config($main, $sub) {
-	global $config;
-	return $config[$main][$sub];
-}
-
-function common_copy_args($from) {
-	$to = array();
-	$strip = get_magic_quotes_gpc();
-	foreach ($from as $k => $v) {
-		$to[$k] = ($strip) ? stripslashes($v) : $v;
-	}
-	return $to;
-}
-
-function common_user_uri(&$user) {
-	return common_local_url('userbyid', array('id' => $user->id));
-}
-
-function common_notice_uri(&$notice) {
-	return common_local_url('shownotice',
-		array('notice' => $notice->id));
-}
-
-# 36 alphanums - lookalikes (0, O, 1, I) = 32 chars = 5 bits
-
-function common_confirmation_code($bits) {
-	# 36 alphanums - lookalikes (0, O, 1, I) = 32 chars = 5 bits
-	static $codechars = '23456789ABCDEFGHJKLMNPQRSTUVWXYZ';
-	$chars = ceil($bits/5);
-	$code = '';
-	for ($i = 0; $i < $chars; $i++) {
-		# XXX: convert to string and back
-		$num = hexdec(common_good_rand(1));
-		# XXX: randomness is too precious to throw away almost
-		# 40% of the bits we get!
-		$code .= $codechars[$num%32];
-	}
-	return $code;
-}
-
-# convert markup to HTML
-
-function common_markup_to_html($c) {
-	$c = preg_replace('/%%action.(\w+)%%/e', "common_local_url('\\1')", $c);
-	$c = preg_replace('/%%doc.(\w+)%%/e', "common_local_url('doc', array('title'=>'\\1'))", $c);
-	$c = preg_replace('/%%(\w+).(\w+)%%/e', 'common_config(\'\\1\', \'\\2\')', $c);
-	return Markdown($c);
+function common_accept_to_prefs($accept, $def = '*/*')
+{
+    // No arg means accept anything (per HTTP spec)
+    if(!$accept) {
+        return array($def => 1);
+    }
+
+    $prefs = array();
+
+    $parts = explode(',', $accept);
+
+    foreach($parts as $part) {
+        // FIXME: doesn't deal with params like 'text/html; level=1'
+        @list($value, $qpart) = explode(';', $part);
+        $match = array();
+        if(!isset($qpart)) {
+            $prefs[$value] = 1;
+        } elseif(preg_match('/q\s*=\s*(\d*\.\d+)/', $qpart, $match)) {
+            $prefs[$value] = $match[1];
+        }
+    }
+
+    return $prefs;
+}
+
+function common_mime_type_match($type, $avail)
+{
+    if(array_key_exists($type, $avail)) {
+        return $type;
+    } else {
+        $parts = explode('/', $type);
+        if(array_key_exists($parts[0] . '/*', $avail)) {
+            return $parts[0] . '/*';
+        } elseif(array_key_exists('*/*', $avail)) {
+            return '*/*';
+        } else {
+            return null;
+        }
+    }
+}
+
+function common_negotiate_type($cprefs, $sprefs)
+{
+    $combine = array();
+
+    foreach(array_keys($sprefs) as $type) {
+        $parts = explode('/', $type);
+        if($parts[1] != '*') {
+            $ckey = common_mime_type_match($type, $cprefs);
+            if($ckey) {
+                $combine[$type] = $sprefs[$type] * $cprefs[$ckey];
+            }
+        }
+    }
+
+    foreach(array_keys($cprefs) as $type) {
+        $parts = explode('/', $type);
+        if($parts[1] != '*' && !array_key_exists($type, $sprefs)) {
+            $skey = common_mime_type_match($type, $sprefs);
+            if($skey) {
+                $combine[$type] = $sprefs[$skey] * $cprefs[$type];
+            }
+        }
+    }
+
+    $bestq = 0;
+    $besttype = "text/html";
+
+    foreach(array_keys($combine) as $type) {
+        if($combine[$type] > $bestq) {
+            $besttype = $type;
+            $bestq = $combine[$type];
+        }
+    }
+
+    return $besttype;
+}
+
+function common_config($main, $sub)
+{
+    global $config;
+    return isset($config[$main][$sub]) ? $config[$main][$sub] : false;
+}
+
+function common_copy_args($from)
+{
+    $to = array();
+    $strip = get_magic_quotes_gpc();
+    foreach ($from as $k => $v) {
+        $to[$k] = ($strip) ? stripslashes($v) : $v;
+    }
+    return $to;
+}
+
+// Neutralise the evil effects of magic_quotes_gpc in the current request.
+// This is used before handing a request off to OAuthRequest::from_request.
+function common_remove_magic_from_request()
+{
+    if(get_magic_quotes_gpc()) {
+        $_POST=array_map('stripslashes',$_POST);
+        $_GET=array_map('stripslashes',$_GET);
+    }
+}
+
+function common_user_uri(&$user)
+{
+    return common_local_url('userbyid', array('id' => $user->id));
+}
+
+function common_notice_uri(&$notice)
+{
+    return common_local_url('shownotice',
+                            array('notice' => $notice->id));
+}
+
+// 36 alphanums - lookalikes (0, O, 1, I) = 32 chars = 5 bits
+
+function common_confirmation_code($bits)
+{
+    // 36 alphanums - lookalikes (0, O, 1, I) = 32 chars = 5 bits
+    static $codechars = '23456789ABCDEFGHJKLMNPQRSTUVWXYZ';
+    $chars = ceil($bits/5);
+    $code = '';
+    for ($i = 0; $i < $chars; $i++) {
+        // XXX: convert to string and back
+        $num = hexdec(common_good_rand(1));
+        // XXX: randomness is too precious to throw away almost
+        // 40% of the bits we get!
+        $code .= $codechars[$num%32];
+    }
+    return $code;
+}
+
+// convert markup to HTML
+
+function common_markup_to_html($c)
+{
+    $c = preg_replace('/%%action.(\w+)%%/e', "common_local_url('\\1')", $c);
+    $c = preg_replace('/%%doc.(\w+)%%/e', "common_local_url('doc', array('title'=>'\\1'))", $c);
+    $c = preg_replace('/%%(\w+).(\w+)%%/e', 'common_config(\'\\1\', \'\\2\')', $c);
+    return Markdown($c);
+}
+
+function common_profile_avatar_url($profile, $size=AVATAR_PROFILE_SIZE)
+{
+    $avatar = $profile->getAvatar($size);
+    if ($avatar) {
+        return common_avatar_display_url($avatar);
+    } else {
+        return common_default_avatar($size);
+    }
+}
+
+function common_profile_uri($profile)
+{
+    if (!$profile) {
+        return null;
+    }
+    $user = User::staticGet($profile->id);
+    if ($user) {
+        return $user->uri;
+    }
+
+    $remote = Remote_profile::staticGet($profile->id);
+    if ($remote) {
+        return $remote->uri;
+    }
+    // XXX: this is a very bad profile!
+    return null;
+}
+
+function common_canonical_sms($sms)
+{
+    // strip non-digits
+    preg_replace('/\D/', '', $sms);
+    return $sms;
+}
+
+function common_error_handler($errno, $errstr, $errfile, $errline, $errcontext)
+{
+    switch ($errno) {
+     case E_USER_ERROR:
+        common_log(LOG_ERR, "[$errno] $errstr ($errfile:$errline)");
+        exit(1);
+        break;
+
+     case E_USER_WARNING:
+        common_log(LOG_WARNING, "[$errno] $errstr ($errfile:$errline)");
+        break;
+
+     case E_USER_NOTICE:
+        common_log(LOG_NOTICE, "[$errno] $errstr ($errfile:$errline)");
+        break;
+    }
+
+    // FIXME: show error page if we're on the Web
+    /* Don't execute PHP internal error handler */
+    return true;
+}
+
+function common_session_token()
+{
+    common_ensure_session();
+    if (!array_key_exists('token', $_SESSION)) {
+        $_SESSION['token'] = common_good_rand(64);
+    }
+    return $_SESSION['token'];
+}
+
+function common_disfavor_form($notice)
+{
+    common_element_start('form', array('id' => 'disfavor-' . $notice->id,
+                                       'method' => 'post',
+                                       'class' => 'disfavor',
+                                       'action' => common_local_url('disfavor')));
+
+    common_element('input', array('type' => 'hidden',
+                                  'name' => 'token-'. $notice->id,
+                                  'id' => 'token-'. $notice->id,
+                                  'class' => 'token',
+                                  'value' => common_session_token()));
+
+    common_element('input', array('type' => 'hidden',
+                                  'name' => 'notice',
+                                  'id' => 'notice-n'. $notice->id,
+                                  'class' => 'notice',
+                                  'value' => $notice->id));
+
+    common_element('input', array('type' => 'submit',
+                                  'id' => 'disfavor-submit-' . $notice->id,
+                                  'name' => 'disfavor-submit-' . $notice->id,
+                                  'class' => 'disfavor',
+                                  'value' => 'Disfavor favorite',
+                                  'title' => 'Remove this message from favorites'));
+    common_element_end('form');
+}
+
+function common_favor_form($notice)
+{
+    common_element_start('form', array('id' => 'favor-' . $notice->id,
+                                       'method' => 'post',
+                                       'class' => 'favor',
+                                       'action' => common_local_url('favor')));
+
+    common_element('input', array('type' => 'hidden',
+                                  'name' => 'token-'. $notice->id,
+                                  'id' => 'token-'. $notice->id,
+                                  'class' => 'token',
+                                  'value' => common_session_token()));
+
+    common_element('input', array('type' => 'hidden',
+                                  'name' => 'notice',
+                                  'id' => 'notice-n'. $notice->id,
+                                  'class' => 'notice',
+                                  'value' => $notice->id));
+
+    common_element('input', array('type' => 'submit',
+                                  'id' => 'favor-submit-' . $notice->id,
+                                  'name' => 'favor-submit-' . $notice->id,
+                                  'class' => 'favor',
+                                  'value' => 'Add to favorites',
+                                  'title' => 'Add this message to favorites'));
+    common_element_end('form');
+}
+
+function common_nudge_form($profile)
+{
+    common_element_start('form', array('id' => 'nudge', 'method' => 'post',
+                                       'action' => common_local_url('nudge', array('nickname' => $profile->nickname))));
+    common_hidden('token', common_session_token());
+    common_element('input', array('type' => 'submit',
+                                  'class' => 'submit',
+                                  'value' => _('Send a nudge')));
+    common_element_end('form');
+}
+function common_nudge_response()
+{
+    common_element('p', array('id' => 'nudge_response'), _('Nudge sent!'));
+}
+
+function common_subscribe_form($profile)
+{
+    common_element_start('form', array('id' => 'subscribe-' . $profile->id,
+                                       'method' => 'post',
+                                       'class' => 'subscribe',
+                                       'action' => common_local_url('subscribe')));
+    common_hidden('token', common_session_token());
+    common_element('input', array('id' => 'subscribeto-' . $profile->id,
+                                  'name' => 'subscribeto',
+                                  'type' => 'hidden',
+                                  'value' => $profile->id));
+    common_element('input', array('type' => 'submit',
+                                  'class' => 'submit',
+                                  'value' => _('Subscribe')));
+    common_element_end('form');
+}
+
+function common_unsubscribe_form($profile)
+{
+    common_element_start('form', array('id' => 'unsubscribe-' . $profile->id,
+                                       'method' => 'post',
+                                       'class' => 'unsubscribe',
+                                       'action' => common_local_url('unsubscribe')));
+    common_hidden('token', common_session_token());
+    common_element('input', array('id' => 'unsubscribeto-' . $profile->id,
+                                  'name' => 'unsubscribeto',
+                                  'type' => 'hidden',
+                                  'value' => $profile->id));
+    common_element('input', array('type' => 'submit',
+                                  'class' => 'submit',
+                                  'value' => _('Unsubscribe')));
+    common_element_end('form');
+}
+
+// XXX: Refactor this code
+function common_profile_new_message_nudge ($cur, $profile)
+{
+    $user = User::staticGet('id', $profile->id);
+
+    if ($cur && $cur->id != $user->id && $cur->mutuallySubscribed($user)) {
+        common_element_start('li', array('id' => 'profile_send_a_new_message'));
+        common_element('a', array('href' => common_local_url('newmessage', array('to' => $user->id))),
+                       _('Send a message'));
+        common_element_end('li');
+
+        if ($user->email && $user->emailnotifynudge) {
+            common_element_start('li', array('id' => 'profile_nudge'));
+            common_nudge_form($user);
+            common_element_end('li');
+        }
+    }
+}
+
+function common_cache_key($extra)
+{
+    return 'laconica:' . common_keyize(common_config('site', 'name')) . ':' . $extra;
+}
+
+function common_keyize($str)
+{
+    $str = strtolower($str);
+    $str = preg_replace('/\s/', '_', $str);
+    return $str;
+}
+
+function common_message_form($content, $user, $to)
+{
+
+    common_element_start('form', array('id' => 'message_form',
+                                       'method' => 'post',
+                                       'action' => common_local_url('newmessage')));
+
+    $mutual_users = $user->mutuallySubscribedUsers();
+
+    $mutual = array();
+
+    while ($mutual_users->fetch()) {
+        if ($mutual_users->id != $user->id) {
+            $mutual[$mutual_users->id] = $mutual_users->nickname;
+        }
+    }
+
+    $mutual_users->free();
+    unset($mutual_users);
+
+    common_dropdown('to', _('To'), $mutual, null, false, $to->id);
+
+    common_element_start('p');
+
+    common_element('textarea', array('id' => 'message_content',
+                                     'cols' => 60,
+                                     'rows' => 3,
+                                     'name' => 'content'),
+                   ($content) ? $content : '');
+
+    common_element('input', array('id' => 'message_send',
+                                  'name' => 'message_send',
+                                  'type' => 'submit',
+                                  'value' => _('Send')));
+
+    common_hidden('token', common_session_token());
+
+    common_element_end('p');
+    common_element_end('form');
+}
+
+function common_memcache()
+{
+    static $cache = null;
+    if (!common_config('memcached', 'enabled')) {
+        return null;
+    } else {
+        if (!$cache) {
+            $cache = new Memcache();
+            $servers = common_config('memcached', 'server');
+            if (is_array($servers)) {
+                foreach($servers as $server) {
+                    $cache->addServer($server);
+                }
+            } else {
+                $cache->addServer($servers);
+            }
+        }
+        return $cache;
+    }
+}
+
+function common_compatible_license($from, $to)
+{
+    // XXX: better compatibility check needed here!
+    return ($from == $to);
+}
+
+/* These are almost identical, so we use a helper function */
+
+function common_block_form($profile, $args=null)
+{
+    common_blocking_form('block', _('Block'), $profile, $args);
+}
+
+function common_unblock_form($profile, $args=null)
+{
+    common_blocking_form('unblock', _('Unblock'), $profile, $args);
+}
+
+function common_blocking_form($type, $label, $profile, $args=null)
+{
+    common_element_start('form', array('id' => $type . '-' . $profile->id,
+                                       'method' => 'post',
+                                       'class' => $type,
+                                       'action' => common_local_url($type)));
+    common_hidden('token', common_session_token());
+    common_element('input', array('id' => $type . 'to-' . $profile->id,
+                                  'name' => $type . 'to',
+                                  'type' => 'hidden',
+                                  'value' => $profile->id));
+    common_element('input', array('type' => 'submit',
+                                  'class' => 'submit',
+                                  'name' => $type,
+                                  'value' => $label));
+    if ($args) {
+        foreach ($args as $k => $v) {
+            common_hidden('returnto-' . $k, $v);
+        }
+    }
+    common_element_end('form');
+    return;
 }