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diff --git a/lib/common.php b/lib/common.php
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+<?php
+
+if (!defined('MICROBLOG')) { exit(1) }
+
+# global configuration object
+
+// default configuration, overwritten in config.php
+
+$config =
+ array('site' =>
+ array('name' => 'Just another µB'),
+ 'dsn' =>
+ array('phptype' => 'mysql',
+ 'username' => 'stoica',
+ 'password' => 'apasswd',
+ 'hostspec' => 'localhost',
+ 'database' => 'thedb')
+ 'dboptions' =>
+ array('debug' => 2,
+ 'portability' => DB_PORTABILITY_ALL));
+
+require_once(INSTALLDIR . '/config.php');
+require_once('DB.php');
+
+# Show a server error
+
+function common_server_error($msg) {
+ header('Status: 500 Server Error');
+ header('Content-type: text/plain');
+
+ print $msg;
+ exit();
+}
+
+# Show a user error
+function common_user_error($msg, $code=200) {
+ common_show_header('Error');
+ common_element('div', array('class' => 'error'), $msg);
+ common_show_footer();
+}
+
+# Start an HTML element
+function common_element_start($tag, $attrs=NULL) {
+ print "<$tag";
+ if (is_array($attrs)) {
+ foreach ($attrs as $name => $value) {
+ print " $name='$value'";
+ }
+ } else if (is_string($attrs)) {
+ print " class='$attrs'";
+ }
+ print '>';
+}
+
+function common_element_end($tag) {
+ print "</$tag>";
+}
+
+function common_element($tag, $attrs=NULL, $content=NULL) {
+ common_element_start($tag, $attrs);
+ if ($content) print htmlspecialchars($content);
+ common_element_end($tag);
+}
+
+function common_show_header($pagetitle) {
+ global $config;
+ common_element_start('html');
+ common_element_start('head');
+ common_element('title', NULL,
+ $pagetitle . " - " . $config['site']['name']);
+ common_element_end('head');
+ common_element_start('body');
+ common_head_menu();
+}
+
+function common_show_footer() {
+ common_foot_menu();
+ common_element_end('body');
+ common_element_end('html');
+}
+
+function common_head_menu() {
+ $user = common_current_user();
+ common_element_start('ul', 'headmenu');
+ common_menu_item(common_local_url('doc', array('title' => 'help')),
+ _t('Help'));
+ if ($user) {
+ common_menu_item(common_local_url('all', array('nickname' =>
+ $user->nickname)),
+ _t('Home'));
+ common_menu_item(common_local_url('showstream', array('nickname' =>
+ $user->nickname)),
+ _t('Profile'), $user->fullname || $user->nickname);
+ common_menu_item(common_local_url('settings'),
+ _t('Settings'));
+ common_menu_item(common_local_url('logout'),
+ _t('Logout'));
+ } else {
+ common_menu_item(common_local_url('login'),
+ _t('Login'));
+ common_menu_item(common_local_url('register'),
+ _t('Register'));
+ }
+ common_element_end('ul');
+}
+
+function common_foot_menu() {
+ common_element_start('ul', 'footmenu');
+ common_menu_item(common_local_url('doc', array('title' => 'about')),
+ _t('About'));
+ common_menu_item(common_local_url('doc', array('title' => 'help')),
+ _t('Help'));
+ common_menu_item(common_local_url('doc', array('title' => 'privacy')),
+ _t('Privacy'));
+}
+
+function common_menu_item($url, $text, $title=NULL) {
+ $attrs['href'] = $url;
+ if ($title) {
+ $attrs['title'] = $title;
+ }
+ common_element_start('li', 'menuitem');
+ common_element('a', $attrs, $text);
+ common_element_end('li');
+}
+
+# salted, hashed passwords are stored in the DB
+
+function common_munge_password($id, $password) {
+ return md5($id . $password);
+}
+
+# check if a username exists and has matching password
+function common_check_user($nickname, $password) {
+ $user = User::staticGet('nickname', $nickname);
+ if (is_null($user)) {
+ return false;
+ } else {
+ return (0 == strcmp(common_munge_password($password, $user->id),
+ $user->password));
+ }
+}
+
+# is the current user logged in?
+function common_logged_in() {
+ return (!is_null(common_current_user()));
+}
+
+function common_have_session() {
+ return (0 != strcmp(session_id(), ''));
+}
+
+function common_ensure_session() {
+ if (!common_have_session()) {
+ @session_start();
+ }
+}
+
+function common_set_user($nickname) {
+ if (is_null($nickname) && common_have_session()) {
+ unset($_SESSION['userid']);
+ return true;
+ } else {
+ $user = User::staticGet('nickname', $nickname);
+ if ($user) {
+ common_ensure_session();
+ $_SESSION['userid'] = $user->id;
+ return true;
+ } else {
+ return false;
+ }
+ }
+ return false;
+}
+
+# who is the current user?
+function common_current_user() {
+ static $user = NULL; # FIXME: global memcached
+ if (is_null($user)) {
+ if (common_have_session()) {
+ $id = $_SESSION['userid'];
+ if ($id) {
+ $user = User::staticGet($id);
+ }
+ }
+ }
+ return $user;
+}
+
+# get canonical version of nickname for comparison
+function common_canonical_nickname($nickname) {
+ # XXX: UTF-8 canonicalization (like combining chars)
+ return strtolower($nickname);
+}
+
+function common_render_content($text) {
+ # XXX: @ messages
+ # XXX: # tags
+ # XXX: machine tags
+ return htmlspecialchars($text);
+}
+
+// XXX: set up gettext
+
+function _t($str) { $str }