lib/util.php

   1 <?php
   2 /*
   3  * Laconica - a distributed open-source microblogging tool
   4  * Copyright (C) 2008, Controlez-Vous, Inc.
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU Affero General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU Affero General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Affero General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 /* XXX: break up into separate modules (HTTP, HTML, user, files) */
  21
  22 # Show a server error
  23
  24 function common_server_error($msg) {
  25         header('Status: 500 Server Error');
  26         header('Content-type: text/plain');
  27
  28         print $msg;
  29         exit();
  30 }
  31
  32 # Show a user error
  33 function common_user_error($msg, $code=200) {
  34         common_show_header('Error');
  35         common_element('div', array('class' => 'error'), $msg);
  36         common_show_footer();
  37 }
  38
  39 $xw = null;
  40
  41 # Start an HTML element
  42 function common_element_start($tag, $attrs=NULL) {
  43         global $xw;
  44         $xw->startElement($tag);
  45         if (is_array($attrs)) {
  46                 foreach ($attrs as $name => $value) {
  47                         $xw->writeAttribute($name, $value);
  48                 }
  49         } else if (is_string($attrs)) {
  50                 $xw->writeAttribute('class', $attrs);
  51         }
  52 }
  53
  54 function common_element_end($tag) {
  55         global $xw;
  56         $xw->endElement();
  57 }
  58
  59 function common_element($tag, $attrs=NULL, $content=NULL) {
  60     common_element_start($tag, $attrs);
  61         if ($content) {
  62                 global $xw;
  63                 $xw->text($content);
  64         }
  65         common_element_end($tag);
  66 }
  67
  68 function common_show_header($pagetitle) {
  69         global $config, $xw;
  70
  71         header('Content-Type: application/xhtml+xml');
  72
  73         $xw = new XMLWriter();
  74         $xw->openURI('php://output');
  75         $xw->setIndent(true);
  76         $xw->startDocument('1.0', 'UTF-8');
  77         $xw->writeDTD('html', '-//W3C//DTD XHTML 1.0 Strict//EN',
  78                                   'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd');
  79
  80         # FIXME: correct language for interface
  81
  82         common_element_start('html', array('xmlns' => 'http://www.w3.org/1999/xhtml',
  83                                                                            'xml:lang' => 'en',
  84                                                                            'lang' => 'en'));
  85
  86         common_element_start('head');
  87         common_element('title', NULL,
  88                                    $pagetitle . " - " . $config['site']['name']);
  89         common_element('link', array('rel' => 'stylesheet',
  90                                                                  'type' => 'text/css',
  91                                                                  'href' => $config['site']['path'] . 'theme/default/style/html.css',
  92                                                                  'media' => 'screen, projection, tv'));
  93         common_element('link', array('rel' => 'stylesheet',
  94                                                                  'type' => 'text/css',
  95                                                                  'href' => $config['site']['path'] . 'theme/default/style/layout.css',
  96                                                                  'media' => 'screen, projection, tv'));
  97         common_element('link', array('rel' => 'stylesheet',
  98                                                                  'type' => 'text/css',
  99                                                                  'href' => $config['site']['path'] . 'theme/default/style/print.css',
 100                                                                  'media' => 'print'));
 101         common_element_end('head');
 102         common_element_start('body');
 103         common_element_start('div', array('id' => 'wrapper'));
 104         common_element_start('div', array('id' => 'content'));
 105         common_element_start('div', array('id' => 'header'));
 106         common_element('h1', 'title', $pagetitle);
 107         common_element('h2', 'subtitle', $config['site']['name']);
 108         common_element_end('div');
 109         common_head_menu();
 110         common_element_start('div', array('id' => 'page'));
 111 }
 112
 113 function common_show_footer() {
 114         global $xw, $config;
 115         common_element_start('p', 'footer');
 116         common_foot_menu();
 117         common_license_block();
 118         common_element_end('p');
 119         common_element_end('div');
 120         common_element_end('div');
 121         common_element_end('div');
 122         common_element_end('body');
 123         common_element_end('html');
 124         $xw->endDocument();
 125         $xw->flush();
 126 }
 127
 128 function common_text($txt) {
 129         global $xw;
 130         $xw->text($txt);
 131 }
 132
 133 function common_license_block() {
 134         global $config, $xw;
 135         common_element_start('div', 'license');
 136         common_element_start('a', array('class' => 'license',
 137                                                                         'rel' => 'license',
 138                                                                         href => $config['license']['url']));
 139         common_element('img', array('class' => 'license',
 140                                                                 'src' => $config['license']['image'],
 141                                                                 'alt' => $config['license']['title']));
 142         common_element_end('a');
 143         common_text(_t('Unless otherwise specified, contents of this site are copyright by the contributors and available under the '));
 144         common_element('a', array('class' => 'license',
 145                                                           'rel' => 'license',
 146                                                           href => $config['license']['url']),
 147                                    $config['license']['title']);
 148         common_text(_t('. Contributors should be attributed by full name or nickname.'));
 149         common_element_end('div');
 150 }
 151
 152 function common_head_menu() {
 153         $user = common_current_user();
 154         common_element_start('ul', array('id' => 'menu', 'class' => ($user) ? 'five' : 'three'));
 155         common_menu_item(common_local_url('doc', array('title' => 'help')),
 156                                          _t('Help'));
 157         if ($user) {
 158                 common_menu_item(common_local_url('all', array('nickname' =>
 159                                                                                                            $user->nickname)),
 160                                                  _t('Home'));
 161                 common_menu_item(common_local_url('showstream', array('nickname' =>
 162                                                                                                                           $user->nickname)),
 163                                                  _t('Profile'),  $user->fullname || $user->nickname);
 164                 common_menu_item(common_local_url('profilesettings'),
 165                                                  _t('Settings'));
 166                 common_menu_item(common_local_url('logout'),
 167                                                  _t('Logout'));
 168         } else {
 169                 common_menu_item(common_local_url('login'),
 170                                                  _t('Login'));
 171                 common_menu_item(common_local_url('register'),
 172                                                  _t('Register'));
 173         }
 174         common_element_end('ul');
 175 }
 176
 177 function common_foot_menu() {
 178         common_element_start('ul', 'footmenu');
 179         common_menu_item(common_local_url('doc', array('title' => 'about')),
 180                                          _t('About'));
 181         common_menu_item(common_local_url('doc', array('title' => 'help')),
 182                                          _t('Help'));
 183         common_menu_item(common_local_url('doc', array('title' => 'privacy')),
 184                                          _t('Privacy'));
 185 }
 186
 187 function common_menu_item($url, $text, $title=NULL) {
 188         $attrs['href'] = $url;
 189         if ($title) {
 190                 $attrs['title'] = $title;
 191         }
 192         common_element_start('li', 'menuitem');
 193         common_element('a', $attrs, $text);
 194         common_element_end('li');
 195 }
 196
 197 function common_input($id, $label, $value=NULL) {
 198         common_element_start('p');
 199         common_element('label', array('for' => $id), $label);
 200         $attrs = array('name' => $id,
 201                                    'type' => 'text',
 202                                    'id' => $id);
 203         if ($value) {
 204                 $attrs['value'] = htmlspecialchars($value);
 205         }
 206         common_element('input', $attrs);
 207         common_element_end('p');
 208 }
 209
 210 function common_password($id, $label) {
 211         common_element_start('p');
 212         common_element('label', array('for' => $id), $label);
 213         $attrs = array('name' => $id,
 214                                    'type' => 'password',
 215                                    'id' => $id);
 216         common_element('input', $attrs);
 217         common_element_end('p');
 218 }
 219
 220 function common_submit($id, $label) {
 221         global $xw;
 222         common_element_start('p');
 223         common_element_start('label', array('for' => $id));
 224         $xw->writeRaw('&nbsp;');
 225         common_element_end('label');
 226         common_element('input', array('type' => 'submit',
 227                                                                   'id' => $id,
 228                                                                   'name' => $id,
 229                                                                   'value' => $label,
 230                                                                   'class' => 'button'));
 231         common_element_end('p');
 232 }
 233
 234 # salted, hashed passwords are stored in the DB
 235
 236 function common_munge_password($id, $password) {
 237         return md5($id . $password);
 238 }
 239
 240 # check if a username exists and has matching password
 241 function common_check_user($nickname, $password) {
 242         $user = User::staticGet('nickname', $nickname);
 243         if (is_null($user)) {
 244                 return false;
 245         } else {
 246                 return (0 == strcmp(common_munge_password($password, $user->id),
 247                                                         $user->password));
 248         }
 249 }
 250
 251 # is the current user logged in?
 252 function common_logged_in() {
 253         return (!is_null(common_current_user()));
 254 }
 255
 256 function common_have_session() {
 257         return (0 != strcmp(session_id(), ''));
 258 }
 259
 260 function common_ensure_session() {
 261         if (!common_have_session()) {
 262                 @session_start();
 263         }
 264 }
 265
 266 function common_set_user($nickname) {
 267         if (is_null($nickname) && common_have_session()) {
 268                 unset($_SESSION['userid']);
 269                 return true;
 270         } else {
 271                 $user = User::staticGet('nickname', $nickname);
 272                 if ($user) {
 273                         common_ensure_session();
 274                         $_SESSION['userid'] = $user->id;
 275                         return true;
 276                 } else {
 277                         return false;
 278                 }
 279         }
 280         return false;
 281 }
 282
 283 # who is the current user?
 284 function common_current_user() {
 285         static $user = NULL; # FIXME: global memcached
 286         if (is_null($user)) {
 287                 common_ensure_session();
 288                 $id = $_SESSION['userid'];
 289                 if ($id) {
 290                         $user = User::staticGet($id);
 291                 }
 292         }
 293         return $user;
 294 }
 295
 296 # get canonical version of nickname for comparison
 297 function common_canonical_nickname($nickname) {
 298         # XXX: UTF-8 canonicalization (like combining chars)
 299         return $nickname;
 300 }
 301
 302 # get canonical version of email for comparison
 303 function common_canonical_email($email) {
 304         # XXX: canonicalize UTF-8
 305         # XXX: lcase the domain part
 306         return $email;
 307 }
 308
 309 function common_render_content($text) {
 310         # XXX: @ messages
 311         # XXX: # tags
 312         # XXX: machine tags
 313         return htmlspecialchars($text);
 314 }
 315
 316 // where should the avatar go for this user?
 317
 318 function common_avatar_filename($user, $extension, $size=NULL) {
 319         global $config;
 320
 321         if ($size) {
 322                 return $user->id . '-' . $size . $extension;
 323         } else {
 324                 return $user->id . '-original' . $extension;
 325         }
 326 }
 327
 328 function common_avatar_path($filename) {
 329         global $config;
 330         return $config['avatar']['directory'] . '/' . $filename;
 331 }
 332
 333 function common_avatar_url($filename) {
 334         global $config;
 335         return $config['avatar']['path'] . '/' . $filename;
 336 }
 337
 338 function common_local_url($action, $args=NULL) {
 339         global $config;
 340         /* XXX: pretty URLs */
 341         $extra = '';
 342         if ($args) {
 343                 foreach ($args as $key => $value) {
 344                         $extra .= "&${key}=${value}";
 345                 }
 346         }
 347         $pathpart = ($config['site']['path']) ? $config['site']['path']."/" : '';
 348         return "http://".$config['site']['server'].'/'.$pathpart."index.php?action=${action}${extra}";
 349 }
 350
 351 function common_date_string($dt) {
 352         // XXX: do some sexy date formatting
 353         // return date(DATE_RFC822, $dt);
 354         return $dt;
 355 }
 356
 357 function common_redirect($url, $code=307) {
 358         static $status = array(301 => "Moved Permanently",
 359                                                    302 => "Found",
 360                                                    303 => "See Other",
 361                                                    307 => "Temporary Redirect");
 362         header("Status: ${code} $status[$code]");
 363         header("Location: $url");
 364         common_element('a', array('href' => $url), $url);
 365 }
 366
 367 function common_broadcast_notices($id) {
 368         // XXX: broadcast notices to remote subscribers
 369         // XXX: broadcast notices to SMS
 370         // XXX: broadcast notices to Jabber
 371         // XXX: broadcast notices to other IM
 372         // XXX: use a queue system like http://code.google.com/p/microapps/wiki/NQDQ
 373         return true;
 374 }
 375
 376 function common_profile_url($nickname) {
 377         return common_local_url('showstream', array('nickname' => $nickname));
 378 }
 379
 380 function common_notice_form() {
 381         common_element_start('form', array('id' => 'newnotice', 'method' => 'POST',
 382                                                                            'action' => common_local_url('newnotice')));
 383         common_element_start('p');
 384         common_element('label', array('for' => 'content'), _t('What\'s up?'));
 385         common_element('textarea', array('rows' => 3, 'cols' => 40,
 386                                                                          'name' => 'content',
 387                                                                          'id' => 'content',
 388                                                                          'class' => 'width50'),
 389                                    ' ');
 390         common_element_end('p');
 391         common_submit('submit', _t('Send'));
 392         common_element_end('form');
 393 }
 394
 395 // XXX: set up gettext
 396
 397 function _t($str) {
 398         return $str;
 399 }