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($tag);
  66 }
  67
  68 function common_start_xml($doc=NULL, $public=NULL, $system=NULL) {
  69         global $xw;
  70         $xw = new XMLWriter();
  71         $xw->openURI('php://output');
  72         $xw->setIndent(true);
  73         $xw->startDocument('1.0', 'UTF-8');
  74         if ($doc) {
  75                 $xw->writeDTD($doc, $public, $system);
  76         }
  77 }
  78
  79 function common_end_xml() {
  80         global $xw;
  81         $xw->endDocument();
  82         $xw->flush();
  83 }
  84
  85 function common_show_header($pagetitle, $callable=NULL, $data=NULL) {
  86         global $config, $xw;
  87
  88         header('Content-Type: application/xhtml+xml');
  89
  90         common_start_xml('html',
  91                                          '-//W3C//DTD XHTML 1.0 Strict//EN',
  92                                          'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd');
  93
  94         # FIXME: correct language for interface
  95
  96         common_element_start('html', array('xmlns' => 'http://www.w3.org/1999/xhtml',
  97                                                                            'xml:lang' => 'en',
  98                                                                            'lang' => 'en'));
  99
 100         common_element_start('head');
 101         common_element('title', NULL,
 102                                    $pagetitle . " - " . $config['site']['name']);
 103         common_element('link', array('rel' => 'stylesheet',
 104                                                                  'type' => 'text/css',
 105                                                                  'href' => $config['site']['path'] . 'theme/default/style/html.css',
 106                                                                  'media' => 'screen, projection, tv'));
 107         common_element('link', array('rel' => 'stylesheet',
 108                                                                  'type' => 'text/css',
 109                                                                  'href' => $config['site']['path'] . 'theme/default/style/layout.css',
 110                                                                  'media' => 'screen, projection, tv'));
 111         common_element('link', array('rel' => 'stylesheet',
 112                                                                  'type' => 'text/css',
 113                                                                  'href' => $config['site']['path'] . 'theme/default/style/print.css',
 114                                                                  'media' => 'print'));
 115         if ($callable) {
 116                 if ($data) {
 117                         call_user_func($callable, $data);
 118                 } else {
 119                         call_user_func($callable);
 120                 }
 121         }
 122         common_element_end('head');
 123         common_element_start('body');
 124         common_element_start('div', array('id' => 'wrapper'));
 125         common_element_start('div', array('id' => 'content'));
 126         common_element_start('div', array('id' => 'header'));
 127         common_element('h1', 'title', $pagetitle);
 128         common_element('h2', 'subtitle', $config['site']['name']);
 129         common_element_end('div');
 130         common_head_menu();
 131         common_element_start('div', array('id' => 'page'));
 132 }
 133
 134 function common_show_footer() {
 135         global $xw, $config;
 136         common_element_start('div', 'footer');
 137         common_foot_menu();
 138         common_license_block();
 139         common_element_end('div');
 140         common_element_end('div');
 141         common_element_end('div');
 142         common_element_end('div');
 143         common_element_end('body');
 144         common_element_end('html');
 145         common_end_xml();
 146 }
 147
 148 function common_text($txt) {
 149         global $xw;
 150         $xw->text($txt);
 151 }
 152
 153 function common_license_block() {
 154         global $config, $xw;
 155         common_element_start('p', 'license greenBg');
 156         common_element_start('span', 'floatLeft width25');
 157         common_element_start('a', array('class' => 'license',
 158                                                                         'rel' => 'license',
 159                                                                         href => $config['license']['url']));
 160         common_element('img', array('class' => 'license',
 161                                                                 'src' => $config['license']['image'],
 162                                                                 'alt' => $config['license']['title']));
 163         common_element_end('a');
 164         common_element_end('span');
 165         common_element_start('span', 'floatRight width75');
 166         common_text(_t('Unless otherwise specified, contents of this site are copyright by the contributors and available under the '));
 167         common_element('a', array('class' => 'license',
 168                                                           'rel' => 'license',
 169                                                           href => $config['license']['url']),
 170                                    $config['license']['title']);
 171         common_text(_t('. Contributors should be attributed by full name or nickname.'));
 172         common_element_end('span');
 173         common_element_end('p');
 174 }
 175
 176 function common_head_menu() {
 177         $user = common_current_user();
 178         common_element_start('ul', array('id' => 'menu', 'class' => ($user) ? 'five' : 'three'));
 179         common_menu_item(common_local_url('public'), _t('Public'));
 180         if ($user) {
 181                 common_menu_item(common_local_url('all', array('nickname' =>
 182                                                                                                            $user->nickname)),
 183                                                  _t('Home'));
 184                 common_menu_item(common_local_url('showstream', array('nickname' =>
 185                                                                                                                           $user->nickname)),
 186                                                  _t('Profile'),  $user->fullname || $user->nickname);
 187                 common_menu_item(common_local_url('profilesettings'),
 188                                                  _t('Settings'));
 189                 common_menu_item(common_local_url('logout'),
 190                                                  _t('Logout'));
 191         } else {
 192                 common_menu_item(common_local_url('login'),
 193                                                  _t('Login'));
 194                 common_menu_item(common_local_url('register'),
 195                                                  _t('Register'));
 196         }
 197         common_element_end('ul');
 198 }
 199
 200 function common_foot_menu() {
 201         common_element_start('ul', 'footmenu menuish');
 202         common_menu_item(common_local_url('doc', array('title' => 'about')),
 203                                          _t('About'));
 204         common_menu_item(common_local_url('doc', array('title' => 'help')),
 205                                          _t('Help'));
 206         common_menu_item(common_local_url('doc', array('title' => 'privacy')),
 207                                          _t('Privacy'));
 208         common_menu_item(common_local_url('doc', array('title' => 'source')),
 209                                          _t('Source'));
 210         common_element_end('ul');
 211 }
 212
 213 function common_menu_item($url, $text, $title=NULL) {
 214         $attrs['href'] = $url;
 215         if ($title) {
 216                 $attrs['title'] = $title;
 217         }
 218         common_element_start('li', 'menuitem');
 219         common_element('a', $attrs, $text);
 220         common_element_end('li');
 221 }
 222
 223 function common_input($id, $label, $value=NULL) {
 224         common_element_start('p');
 225         common_element('label', array('for' => $id), $label);
 226         $attrs = array('name' => $id,
 227                                    'type' => 'text',
 228                                    'id' => $id);
 229         if ($value) {
 230                 $attrs['value'] = htmlspecialchars($value);
 231         }
 232         common_element('input', $attrs);
 233         common_element_end('p');
 234 }
 235
 236 function common_password($id, $label) {
 237         common_element_start('p');
 238         common_element('label', array('for' => $id), $label);
 239         $attrs = array('name' => $id,
 240                                    'type' => 'password',
 241                                    'id' => $id);
 242         common_element('input', $attrs);
 243         common_element_end('p');
 244 }
 245
 246 function common_submit($id, $label) {
 247         global $xw;
 248         common_element_start('p');
 249         common_element_start('label', array('for' => $id));
 250         $xw->writeRaw('&nbsp;');
 251         common_element_end('label');
 252         common_element('input', array('type' => 'submit',
 253                                                                   'id' => $id,
 254                                                                   'name' => $id,
 255                                                                   'value' => $label,
 256                                                                   'class' => 'button'));
 257         common_element_end('p');
 258 }
 259
 260 function common_textarea($id, $label, $content=NULL) {
 261         common_element_start('p');
 262         common_element('label', array('for' => $id), $label);
 263         common_element('textarea', array('rows' => 3,
 264                                                                          'cols' => 40,
 265                                                                          'name' => $id,
 266                                                                          'id' => $id,
 267                                                                          'class' => 'width50'),
 268                                    ($content) ? $content : ' ');
 269         common_element_end('p');
 270 }
 271
 272 # salted, hashed passwords are stored in the DB
 273
 274 function common_munge_password($id, $password) {
 275         return md5($id . $password);
 276 }
 277
 278 # check if a username exists and has matching password
 279 function common_check_user($nickname, $password) {
 280         $user = User::staticGet('nickname', $nickname);
 281         if (is_null($user)) {
 282                 return false;
 283         } else {
 284                 return (0 == strcmp(common_munge_password($password, $user->id),
 285                                                         $user->password));
 286         }
 287 }
 288
 289 # is the current user logged in?
 290 function common_logged_in() {
 291         return (!is_null(common_current_user()));
 292 }
 293
 294 function common_have_session() {
 295         return (0 != strcmp(session_id(), ''));
 296 }
 297
 298 function common_ensure_session() {
 299         if (!common_have_session()) {
 300                 @session_start();
 301         }
 302 }
 303
 304 function common_set_user($nickname) {
 305         if (is_null($nickname) && common_have_session()) {
 306                 unset($_SESSION['userid']);
 307                 return true;
 308         } else {
 309                 $user = User::staticGet('nickname', $nickname);
 310                 if ($user) {
 311                         common_ensure_session();
 312                         $_SESSION['userid'] = $user->id;
 313                         return true;
 314                 } else {
 315                         return false;
 316                 }
 317         }
 318         return false;
 319 }
 320
 321 # who is the current user?
 322 function common_current_user() {
 323         static $user = NULL; # FIXME: global memcached
 324         if (is_null($user)) {
 325                 common_ensure_session();
 326                 $id = $_SESSION['userid'];
 327                 if ($id) {
 328                         $user = User::staticGet($id);
 329                 }
 330         }
 331         return $user;
 332 }
 333
 334 # get canonical version of nickname for comparison
 335 function common_canonical_nickname($nickname) {
 336         # XXX: UTF-8 canonicalization (like combining chars)
 337         return $nickname;
 338 }
 339
 340 # get canonical version of email for comparison
 341 function common_canonical_email($email) {
 342         # XXX: canonicalize UTF-8
 343         # XXX: lcase the domain part
 344         return $email;
 345 }
 346
 347 function common_render_content($text) {
 348         # XXX: @ messages
 349         # XXX: # tags
 350         # XXX: machine tags
 351         return htmlspecialchars($text);
 352 }
 353
 354 // where should the avatar go for this user?
 355
 356 function common_avatar_filename($user, $extension, $size=NULL, $extra=NULL) {
 357         global $config;
 358
 359         if ($size) {
 360                 return $user->id . '-' . $size . (($extra) ? ('-' . $extra) : '') . $extension;
 361         } else {
 362                 return $user->id . '-original' . (($extra) ? ('-' . $extra) : '') . $extension;
 363         }
 364 }
 365
 366 function common_avatar_path($filename) {
 367         global $config;
 368         return $config['avatar']['directory'] . '/' . $filename;
 369 }
 370
 371 function common_avatar_url($filename) {
 372         global $config;
 373         return "http://".$config['site']['server'].$config['avatar']['path'].'/'.$filename;
 374 }
 375
 376 function common_default_avatar($size) {
 377         static $sizenames = array(AVATAR_PROFILE_SIZE => 'profile',
 378                                                           AVATAR_STREAM_SIZE => 'stream',
 379                                                           AVATAR_MINI_SIZE => 'mini');
 380         global $config;
 381         return "http://".$config['site']['server'].$config['site']['path'].'/'.$config['avatar']['default'][$sizenames[$size]];
 382 }
 383
 384 function common_local_url($action, $args=NULL) {
 385         global $config;
 386         /* XXX: pretty URLs */
 387         $extra = '';
 388         if ($args) {
 389                 foreach ($args as $key => $value) {
 390                         $extra .= "&${key}=${value}";
 391                 }
 392         }
 393         $pathpart = ($config['site']['path']) ? $config['site']['path']."/" : '';
 394         return "http://".$config['site']['server'].'/'.$pathpart."index.php?action=${action}${extra}";
 395 }
 396
 397 function common_date_string($dt) {
 398         // XXX: do some sexy date formatting
 399         // return date(DATE_RFC822, $dt);
 400         return $dt;
 401 }
 402
 403 function common_date_w3dtf($dt) {
 404         $t = strtotime($dt);
 405         return date(DATE_W3C, $t);
 406 }
 407
 408 function common_redirect($url, $code=307) {
 409         static $status = array(301 => "Moved Permanently",
 410                                                    302 => "Found",
 411                                                    303 => "See Other",
 412                                                    307 => "Temporary Redirect");
 413         header("Status: ${code} $status[$code]");
 414         header("Location: $url");
 415         common_element('a', array('href' => $url), $url);
 416 }
 417
 418 function common_broadcast_notice($notice) {
 419         // XXX: broadcast notices to remote subscribers
 420         // XXX: broadcast notices to SMS
 421         // XXX: broadcast notices to Jabber
 422         // XXX: broadcast notices to other IM
 423         // XXX: use a queue system like http://code.google.com/p/microapps/wiki/NQDQ
 424         return true;
 425 }
 426
 427 function common_profile_url($nickname) {
 428         return common_local_url('showstream', array('nickname' => $nickname));
 429 }
 430
 431 function common_notice_form() {
 432         common_element_start('form', array('id' => 'newnotice', 'method' => 'POST',
 433                                                                            'action' => common_local_url('newnotice')));
 434         common_textarea('noticecontent', _t('What\'s up?'));
 435         common_submit('submit', _t('Send'));
 436         common_element_end('form');
 437 }
 438
 439 function common_mint_tag($extra) {
 440         global $config;
 441         return
 442           'tag:'.$config['tag']['authority'].','.
 443           $config['tag']['date'].':'.$config['tag']['prefix'].$extra;
 444 }
 445
 446 # Should make up a reasonable root URL
 447
 448 function common_root_url() {
 449         global $config;
 450         $pathpart = ($config['site']['path']) ? $config['site']['path']."/" : '';
 451         return "http://".$config['site']['server'].'/'.$pathpart;
 452 }
 453
 454 # returns $bytes bytes of random data as a hexadecimal string
 455 # "good" here is a goal and not a guarantee
 456
 457 function common_good_rand($bytes) {
 458         # XXX: use random.org...?
 459         if (file_exists('/dev/urandom')) {
 460                 return common_urandom($bytes);
 461         } else { # FIXME: this is probably not good enough
 462                 return common_mtrand($bytes);
 463         }
 464 }
 465
 466 function common_urandom($bytes) {
 467         $h = fopen('/dev/urandom', 'rb');
 468         # should not block
 469         $src = fread($h, $bytes);
 470         fclose($h);
 471         $enc = '';
 472         for ($i = 0; $i < $bytes; $i++) {
 473                 $enc .= sprintf("%02x", (ord($src[$i])));
 474         }
 475         return $enc;
 476 }
 477
 478 function common_mtrand($bytes) {
 479         $enc = '';
 480         for ($i = 0; $i < $bytes; $i++) {
 481                 $enc .= sprintf("%02x", mt_rand(0, 255));
 482         }
 483         return $enc;
 484 }
 485
 486 function common_timestamp() {
 487         return date('YmdHis');
 488 }
 489
 490 // XXX: set up gettext
 491
 492 function _t($str) {
 493         return $str;
 494 }