lib/common.php

   1 <?php
   2
   3 if (!defined('MICROBLOG')) { exit(1) }
   4
   5 # global configuration object
   6
   7 // default configuration, overwritten in config.php
   8
   9 $config =
  10   array('site' =>
  11                 array('name' => 'Just another µB'),
  12                 'dsn' =>
  13                 array('phptype' => 'mysql',
  14                           'username' => 'stoica',
  15                           'password' => 'apasswd',
  16                           'hostspec' => 'localhost',
  17                           'database' => 'thedb')
  18                 'dboptions' =>
  19                 array('debug' => 2,
  20                           'portability' => DB_PORTABILITY_ALL));
  21
  22 require_once(INSTALLDIR . '/config.php');
  23 require_once('DB.php');
  24
  25 # Show a server error
  26
  27 function common_server_error($msg) {
  28         header('Status: 500 Server Error');
  29         header('Content-type: text/plain');
  30
  31         print $msg;
  32         exit();
  33 }
  34
  35 # Show a user error
  36 function common_user_error($msg, $code=200) {
  37         common_show_header('Error');
  38         common_element('div', array('class' => 'error'), $msg);
  39         common_show_footer();
  40 }
  41
  42 # Start an HTML element
  43 function common_element_start($tag, $attrs=NULL) {
  44         print "<$tag";
  45         if (is_array($attrs)) {
  46                 foreach ($attrs as $name => $value) {
  47                         print " $name='$value'";
  48                 }
  49         } else if (is_string($attrs)) {
  50                 print " class='$attrs'";
  51         }
  52         print '>';
  53 }
  54
  55 function common_element_end($tag) {
  56         print "</$tag>";
  57 }
  58
  59 function common_element($tag, $attrs=NULL, $content=NULL) {
  60     common_element_start($tag, $attrs);
  61         if ($content) print htmlspecialchars($content);
  62         common_element_end($tag);
  63 }
  64
  65 function common_show_header($pagetitle) {
  66         global $config;
  67         common_element_start('html');
  68         common_element_start('head');
  69         common_element('title', NULL,
  70                                    $pagetitle . " - " . $config['site']['name']);
  71         common_element_end('head');
  72         common_element_start('body');
  73         common_head_menu();
  74 }
  75
  76 function common_show_footer() {
  77         common_foot_menu();
  78         common_element_end('body');
  79         common_element_end('html');
  80 }
  81
  82 function common_head_menu() {
  83         $user = common_current_user();
  84         common_element_start('ul', 'headmenu');
  85         common_menu_item(common_local_url('doc', array('title' => 'help')),
  86                                          _t('Help'));
  87         if ($user) {
  88                 common_menu_item(common_local_url('all', array('nickname' =>
  89                                                                                                            $user->nickname)),
  90                                                  _t('Home'));
  91                 common_menu_item(common_local_url('showstream', array('nickname' =>
  92                                                                                                                           $user->nickname)),
  93                                                  _t('Profile'),  $user->fullname || $user->nickname);
  94                 common_menu_item(common_local_url('settings'),
  95                                                  _t('Settings'));
  96                 common_menu_item(common_local_url('logout'),
  97                                                  _t('Logout'));
  98         } else {
  99                 common_menu_item(common_local_url('login'),
 100                                                  _t('Login'));
 101                 common_menu_item(common_local_url('register'),
 102                                                  _t('Register'));
 103         }
 104         common_element_end('ul');
 105 }
 106
 107 function common_foot_menu() {
 108         common_element_start('ul', 'footmenu');
 109         common_menu_item(common_local_url('doc', array('title' => 'about')),
 110                                          _t('About'));
 111         common_menu_item(common_local_url('doc', array('title' => 'help')),
 112                                          _t('Help'));
 113         common_menu_item(common_local_url('doc', array('title' => 'privacy')),
 114                                          _t('Privacy'));
 115 }
 116
 117 function common_menu_item($url, $text, $title=NULL) {
 118         $attrs['href'] = $url;
 119         if ($title) {
 120                 $attrs['title'] = $title;
 121         }
 122         common_element_start('li', 'menuitem');
 123         common_element('a', $attrs, $text);
 124         common_element_end('li');
 125 }
 126
 127 # salted, hashed passwords are stored in the DB
 128
 129 function common_munge_password($id, $password) {
 130         return md5($id . $password);
 131 }
 132
 133 # check if a username exists and has matching password
 134 function common_check_user($nickname, $password) {
 135         $user = User::staticGet('nickname', $nickname);
 136         if (is_null($user)) {
 137                 return false;
 138         } else {
 139                 return (0 == strcmp(common_munge_password($password, $user->id),
 140                                                         $user->password));
 141         }
 142 }
 143
 144 # is the current user logged in?
 145 function common_logged_in() {
 146         return (!is_null(common_current_user()));
 147 }
 148
 149 function common_have_session() {
 150         return (0 != strcmp(session_id(), ''));
 151 }
 152
 153 function common_ensure_session() {
 154         if (!common_have_session()) {
 155                 @session_start();
 156         }
 157 }
 158
 159 function common_set_user($nickname) {
 160         if (is_null($nickname) && common_have_session()) {
 161                 unset($_SESSION['userid']);
 162                 return true;
 163         } else {
 164                 $user = User::staticGet('nickname', $nickname);
 165                 if ($user) {
 166                         common_ensure_session();
 167                         $_SESSION['userid'] = $user->id;
 168                         return true;
 169                 } else {
 170                         return false;
 171                 }
 172         }
 173         return false;
 174 }
 175
 176 # who is the current user?
 177 function common_current_user() {
 178         static $user = NULL; # FIXME: global memcached
 179         if (is_null($user)) {
 180                 if (common_have_session()) {
 181                         $id = $_SESSION['userid'];
 182                         if ($id) {
 183                                 $user = User::staticGet($id);
 184                         }
 185                 }
 186         }
 187         return $user;
 188 }
 189
 190 # get canonical version of nickname for comparison
 191 function common_canonical_nickname($nickname) {
 192         # XXX: UTF-8 canonicalization (like combining chars)
 193         return strtolower($nickname);
 194 }
 195
 196 function common_render_content($text) {
 197         # XXX: @ messages
 198         # XXX: # tags
 199         # XXX: machine tags
 200         return htmlspecialchars($text);
 201 }
 202
 203 // XXX: set up gettext
 204
 205 function _t($str) { $str }