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('HTTP/1.1 500 Server Error');
  26         header('Content-type: text/plain');
  27
  28         print $msg;
  29         print "\n";
  30         exit();
  31 }
  32
  33 # Show a user error
  34 function common_user_error($msg, $code=200) {
  35         common_show_header('Error');
  36         common_element('div', array('class' => 'error'), $msg);
  37         common_show_footer();
  38 }
  39
  40 $xw = null;
  41
  42 # Start an HTML element
  43 function common_element_start($tag, $attrs=NULL) {
  44         global $xw;
  45         $xw->startElement($tag);
  46         if (is_array($attrs)) {
  47                 foreach ($attrs as $name => $value) {
  48                         $xw->writeAttribute($name, $value);
  49                 }
  50         } else if (is_string($attrs)) {
  51                 $xw->writeAttribute('class', $attrs);
  52         }
  53 }
  54
  55 function common_element_end($tag) {
  56         global $xw;
  57         $xw->endElement();
  58 }
  59
  60 function common_element($tag, $attrs=NULL, $content=NULL) {
  61     common_element_start($tag, $attrs);
  62         if ($content) {
  63                 global $xw;
  64                 $xw->text($content);
  65         }
  66         common_element_end($tag);
  67 }
  68
  69 function common_start_xml($doc=NULL, $public=NULL, $system=NULL) {
  70         global $xw;
  71         $xw = new XMLWriter();
  72         $xw->openURI('php://output');
  73         $xw->setIndent(true);
  74         $xw->startDocument('1.0', 'UTF-8');
  75         if ($doc) {
  76                 $xw->writeDTD($doc, $public, $system);
  77         }
  78 }
  79
  80 function common_end_xml() {
  81         global $xw;
  82         $xw->endDocument();
  83         $xw->flush();
  84 }
  85
  86 function common_show_header($pagetitle, $callable=NULL, $data=NULL) {
  87         global $config, $xw;
  88
  89         header('Content-Type: application/xhtml+xml');
  90
  91         common_start_xml('html',
  92                                          '-//W3C//DTD XHTML 1.0 Strict//EN',
  93                                          'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd');
  94
  95         # FIXME: correct language for interface
  96
  97         common_element_start('html', array('xmlns' => 'http://www.w3.org/1999/xhtml',
  98                                                                            'xml:lang' => 'en',
  99                                                                            'lang' => 'en'));
 100
 101         common_element_start('head');
 102         common_element('title', NULL,
 103                                    $pagetitle . " - " . $config['site']['name']);
 104         common_element('link', array('rel' => 'stylesheet',
 105                                                                  'type' => 'text/css',
 106                                                                  'href' => common_path('theme/default/style/html.css'),
 107                                                                  'media' => 'screen, projection, tv'));
 108         common_element('link', array('rel' => 'stylesheet',
 109                                                                  'type' => 'text/css',
 110                                                                  'href' => common_path('theme/default/style/layout.css'),
 111                                                                  'media' => 'screen, projection, tv'));
 112         common_element('link', array('rel' => 'stylesheet',
 113                                                                  'type' => 'text/css',
 114                                                                  'href' => common_path('theme/default/style/print.css'),
 115                                                                  'media' => 'print'));
 116         if ($callable) {
 117                 if ($data) {
 118                         call_user_func($callable, $data);
 119                 } else {
 120                         call_user_func($callable);
 121                 }
 122         }
 123         common_element_end('head');
 124         common_element_start('body');
 125         common_element_start('div', array('id' => 'wrapper'));
 126         common_element_start('div', array('id' => 'content'));
 127         common_element_start('div', array('id' => 'header'));
 128         common_element('h1', 'title', $pagetitle);
 129         common_element('h2', 'subtitle', $config['site']['name']);
 130         common_element_end('div');
 131         common_head_menu();
 132         common_element_start('div', array('id' => 'page'));
 133 }
 134
 135 function common_show_footer() {
 136         global $xw, $config;
 137         common_element_start('div', 'footer');
 138         common_foot_menu();
 139         common_license_block();
 140         common_element_end('div');
 141         common_element_end('div');
 142         common_element_end('div');
 143         common_element_end('div');
 144         common_element_end('body');
 145         common_element_end('html');
 146         common_end_xml();
 147 }
 148
 149 function common_text($txt) {
 150         global $xw;
 151         $xw->text($txt);
 152 }
 153
 154 function common_raw($xml) {
 155         global $xw;
 156         $xw->writeRaw($xml);
 157 }
 158
 159 function common_license_block() {
 160         global $config, $xw;
 161         common_element_start('p', 'license greenBg');
 162         common_element_start('span', 'floatLeft width25');
 163         common_element_start('a', array('class' => 'license',
 164                                                                         'rel' => 'license',
 165                                                                         href => $config['license']['url']));
 166         common_element('img', array('class' => 'license',
 167                                                                 'src' => $config['license']['image'],
 168                                                                 'alt' => $config['license']['title']));
 169         common_element_end('a');
 170         common_element_end('span');
 171         common_element_start('span', 'floatRight width75');
 172         common_text(_t('Unless otherwise specified, contents of this site are copyright by the contributors and available under the '));
 173         common_element('a', array('class' => 'license',
 174                                                           'rel' => 'license',
 175                                                           href => $config['license']['url']),
 176                                    $config['license']['title']);
 177         common_text(_t('. Contributors should be attributed by full name or nickname.'));
 178         common_element_end('span');
 179         common_element_end('p');
 180 }
 181
 182 function common_head_menu() {
 183         $user = common_current_user();
 184         common_element_start('ul', array('id' => 'menu', 'class' => ($user) ? 'five' : 'three'));
 185         common_menu_item(common_local_url('public'), _t('Public'));
 186         if ($user) {
 187                 common_menu_item(common_local_url('all', array('nickname' =>
 188                                                                                                            $user->nickname)),
 189                                                  _t('Home'));
 190                 common_menu_item(common_local_url('showstream', array('nickname' =>
 191                                                                                                                           $user->nickname)),
 192                                                  _t('Profile'),  $user->fullname || $user->nickname);
 193                 common_menu_item(common_local_url('profilesettings'),
 194                                                  _t('Settings'));
 195                 common_menu_item(common_local_url('logout'),
 196                                                  _t('Logout'));
 197         } else {
 198                 common_menu_item(common_local_url('login'),
 199                                                  _t('Login'));
 200                 common_menu_item(common_local_url('register'),
 201                                                  _t('Register'));
 202         }
 203         common_element_end('ul');
 204 }
 205
 206 function common_foot_menu() {
 207         common_element_start('ul', 'footmenu menuish');
 208         common_menu_item(common_local_url('doc', array('title' => 'about')),
 209                                          _t('About'));
 210         common_menu_item(common_local_url('doc', array('title' => 'help')),
 211                                          _t('Help'));
 212         common_menu_item(common_local_url('doc', array('title' => 'privacy')),
 213                                          _t('Privacy'));
 214         common_menu_item(common_local_url('doc', array('title' => 'source')),
 215                                          _t('Source'));
 216         common_element_end('ul');
 217 }
 218
 219 function common_menu_item($url, $text, $title=NULL) {
 220         $attrs['href'] = $url;
 221         if ($title) {
 222                 $attrs['title'] = $title;
 223         }
 224         common_element_start('li', 'menuitem');
 225         common_element('a', $attrs, $text);
 226         common_element_end('li');
 227 }
 228
 229 function common_input($id, $label, $value=NULL) {
 230         common_element_start('p');
 231         common_element('label', array('for' => $id), $label);
 232         $attrs = array('name' => $id,
 233                                    'type' => 'text',
 234                                    'id' => $id);
 235         if ($value) {
 236                 $attrs['value'] = htmlspecialchars($value);
 237         }
 238         common_element('input', $attrs);
 239         common_element_end('p');
 240 }
 241
 242 function common_hidden($id, $value) {
 243         common_element('input', array('name' => $id,
 244                                                                   'type' => 'hidden',
 245                                                                   'id' => $id,
 246                                                                   'value' => $value));
 247 }
 248
 249 function common_password($id, $label) {
 250         common_element_start('p');
 251         common_element('label', array('for' => $id), $label);
 252         $attrs = array('name' => $id,
 253                                    'type' => 'password',
 254                                    'id' => $id);
 255         common_element('input', $attrs);
 256         common_element_end('p');
 257 }
 258
 259 function common_submit($id, $label) {
 260         global $xw;
 261         common_element_start('p');
 262         common_element_start('label', array('for' => $id));
 263         $xw->writeRaw('&nbsp;');
 264         common_element_end('label');
 265         common_element('input', array('type' => 'submit',
 266                                                                   'id' => $id,
 267                                                                   'name' => $id,
 268                                                                   'value' => $label,
 269                                                                   'class' => 'button'));
 270         common_element_end('p');
 271 }
 272
 273 function common_textarea($id, $label, $content=NULL) {
 274         common_element_start('p');
 275         common_element('label', array('for' => $id), $label);
 276         common_element('textarea', array('rows' => 3,
 277                                                                          'cols' => 40,
 278                                                                          'name' => $id,
 279                                                                          'id' => $id,
 280                                                                          'class' => 'width50'),
 281                                    ($content) ? $content : ' ');
 282         common_element_end('p');
 283 }
 284
 285 # salted, hashed passwords are stored in the DB
 286
 287 function common_munge_password($id, $password) {
 288         return md5($id . $password);
 289 }
 290
 291 # check if a username exists and has matching password
 292 function common_check_user($nickname, $password) {
 293         $user = User::staticGet('nickname', $nickname);
 294         if (is_null($user)) {
 295                 return false;
 296         } else {
 297                 return (0 == strcmp(common_munge_password($password, $user->id),
 298                                                         $user->password));
 299         }
 300 }
 301
 302 # is the current user logged in?
 303 function common_logged_in() {
 304         return (!is_null(common_current_user()));
 305 }
 306
 307 function common_have_session() {
 308         return (0 != strcmp(session_id(), ''));
 309 }
 310
 311 function common_ensure_session() {
 312         if (!common_have_session()) {
 313                 @session_start();
 314         }
 315 }
 316
 317 function common_set_user($nickname) {
 318         if (is_null($nickname) && common_have_session()) {
 319                 unset($_SESSION['userid']);
 320                 return true;
 321         } else {
 322                 $user = User::staticGet('nickname', $nickname);
 323                 if ($user) {
 324                         common_ensure_session();
 325                         $_SESSION['userid'] = $user->id;
 326                         return true;
 327                 } else {
 328                         return false;
 329                 }
 330         }
 331         return false;
 332 }
 333
 334 # who is the current user?
 335 function common_current_user() {
 336         static $user = NULL; # FIXME: global memcached
 337         if (is_null($user)) {
 338                 common_ensure_session();
 339                 $id = $_SESSION['userid'];
 340                 if ($id) {
 341                         $user = User::staticGet($id);
 342                 }
 343         }
 344         return $user;
 345 }
 346
 347 # get canonical version of nickname for comparison
 348 function common_canonical_nickname($nickname) {
 349         # XXX: UTF-8 canonicalization (like combining chars)
 350         return $nickname;
 351 }
 352
 353 # get canonical version of email for comparison
 354 function common_canonical_email($email) {
 355         # XXX: canonicalize UTF-8
 356         # XXX: lcase the domain part
 357         return $email;
 358 }
 359
 360 define('URL_REGEX', '^|[ \t\r\n])((ftp|http|https|gopher|mailto|news|nntp|telnet|wais|file|prospero|aim|webcal):(([A-Za-z0-9$_.+!*(),;/?:@&~=-])|%[A-Fa-f0-9]{2}){2,}(#([a-zA-Z0-9][a-zA-Z0-9$_.+!*(),;/?:@&~=%-]*))?([A-Za-z0-9$_+!*();/?:~-]))');
 361
 362 function common_render_content($text, $notice) {
 363         $r = htmlspecialchars($text);
 364         $id = $notice->profile_id;
 365         $r = preg_replace('@https?://\S+@', '<a href="\0" class="extlink">\0</a>', $r);
 366         $r = preg_replace('/(^|\b)@([\w-]+)($|\b)/e', "'\\1@'.common_at_link($id, '\\2').'\\3'", $r);
 367         # XXX: # tags
 368         # XXX: machine tags
 369         return $r;
 370 }
 371
 372 function common_at_link($sender_id, $nickname) {
 373         # Try to find profiles this profile is subscribed to that have this nickname
 374         $recipient = new Profile();
 375         # XXX: chokety and bad
 376         $recipient->whereAdd('EXISTS (SELECT subscribed from subscription where subscriber = '.$sender_id.' and subscribed = id)', 'AND');
 377         $recipient->whereAdd('nickname = "' . trim($nickname) . '"', 'AND');
 378         if ($recipient->find(TRUE)) {
 379                 return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink tolistenee">'.$nickname.'</a>';
 380         }
 381         # Try to find profiles that listen to this profile and that have this nickname
 382         $recipient = new Profile();
 383         # XXX: chokety and bad
 384         $recipient->whereAdd('EXISTS (SELECT subscriber from subscription where subscribed = '.$sender_id.' and subscriber = id)', 'AND');
 385         $recipient->whereAdd('nickname = "' . trim($nickname) . '"', 'AND');
 386         if ($recipient->find(TRUE)) {
 387                 return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink tolistener">'.$nickname.'</a>';
 388         }
 389         # If this is a local user, try to find a local user with that nickname.
 390         $sender = User::staticGet($sender_id);
 391         if ($sender) {
 392                 $recipient_user = User::staticGet('nickname', $nickname);
 393                 if ($recipient_user) {
 394                         $recipient = $recipient->getProfile();
 395                         return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink usertouser">'.$nickname.'</a>';
 396                 }
 397         }
 398         # Otherwise, no links. @messages from local users to remote users,
 399         # or from remote users to other remote users, are just
 400         # outside our ability to make intelligent guesses about
 401         return $nickname;
 402 }
 403
 404 // where should the avatar go for this user?
 405
 406 function common_avatar_filename($user, $extension, $size=NULL, $extra=NULL) {
 407         global $config;
 408
 409         if ($size) {
 410                 return $user->id . '-' . $size . (($extra) ? ('-' . $extra) : '') . $extension;
 411         } else {
 412                 return $user->id . '-original' . (($extra) ? ('-' . $extra) : '') . $extension;
 413         }
 414 }
 415
 416 function common_avatar_path($filename) {
 417         global $config;
 418         return INSTALLDIR . '/avatar/' . $filename;
 419 }
 420
 421 function common_avatar_url($filename) {
 422         return common_path('avatar/'.$filename);
 423 }
 424
 425 function common_default_avatar($size) {
 426         static $sizenames = array(AVATAR_PROFILE_SIZE => 'profile',
 427                                                           AVATAR_STREAM_SIZE => 'stream',
 428                                                           AVATAR_MINI_SIZE => 'mini');
 429         global $config;
 430
 431         return common_path($config['avatar']['default'][$sizenames[$size]]);
 432 }
 433
 434 function common_local_url($action, $args=NULL) {
 435         global $config;
 436         if ($config['site']['fancy']) {
 437                 return common_fancy_url($action, $args);
 438         } else {
 439                 return common_simple_url($action, $args);
 440         }
 441 }
 442
 443 function common_fancy_url($action, $args=NULL) {
 444         switch (strtolower($action)) {
 445          default:
 446                 return common_simple_url($action, $args);
 447         }
 448 }
 449
 450 function common_simple_url($action, $args=NULL) {
 451         global $config;
 452         /* XXX: pretty URLs */
 453         $extra = '';
 454         if ($args) {
 455                 foreach ($args as $key => $value) {
 456                         $extra .= "&${key}=${value}";
 457                 }
 458         }
 459         return common_path("index.php?action=${action}${extra}");
 460 }
 461
 462 function common_path($relative) {
 463         global $config;
 464         $pathpart = ($config['site']['path']) ? $config['site']['path']."/" : '';
 465         return "http://".$config['site']['server'].'/'.$pathpart.$relative;
 466 }
 467
 468 function common_date_string($dt) {
 469         // XXX: do some sexy date formatting
 470         // return date(DATE_RFC822, $dt);
 471         return $dt;
 472 }
 473
 474 function common_date_w3dtf($dt) {
 475         $t = strtotime($dt);
 476         return date(DATE_W3C, $t);
 477 }
 478
 479 function common_redirect($url, $code=307) {
 480         static $status = array(301 => "Moved Permanently",
 481                                                    302 => "Found",
 482                                                    303 => "See Other",
 483                                                    307 => "Temporary Redirect");
 484         header("Status: ${code} $status[$code]");
 485         header("Location: $url");
 486         common_element('a', array('href' => $url), $url);
 487 }
 488
 489 function common_broadcast_notice($notice) {
 490         // XXX: broadcast notices to remote subscribers
 491         // XXX: broadcast notices to SMS
 492         // XXX: broadcast notices to Jabber
 493         // XXX: broadcast notices to other IM
 494         // XXX: use a queue system like http://code.google.com/p/microapps/wiki/NQDQ
 495         return true;
 496 }
 497
 498 function common_profile_url($nickname) {
 499         return common_local_url('showstream', array('nickname' => $nickname));
 500 }
 501
 502 function common_notice_form() {
 503         common_element_start('form', array('id' => 'newnotice', 'method' => 'POST',
 504                                                                            'action' => common_local_url('newnotice')));
 505         common_textarea('noticecontent', _t('What\'s up?'));
 506         common_submit('submit', _t('Send'));
 507         common_element_end('form');
 508 }
 509
 510 function common_mint_tag($extra) {
 511         global $config;
 512         return
 513           'tag:'.$config['tag']['authority'].','.
 514           $config['tag']['date'].':'.$config['tag']['prefix'].$extra;
 515 }
 516
 517 # Should make up a reasonable root URL
 518
 519 function common_root_url() {
 520         return common_path('');
 521 }
 522
 523 # returns $bytes bytes of random data as a hexadecimal string
 524 # "good" here is a goal and not a guarantee
 525
 526 function common_good_rand($bytes) {
 527         # XXX: use random.org...?
 528         if (file_exists('/dev/urandom')) {
 529                 return common_urandom($bytes);
 530         } else { # FIXME: this is probably not good enough
 531                 return common_mtrand($bytes);
 532         }
 533 }
 534
 535 function common_urandom($bytes) {
 536         $h = fopen('/dev/urandom', 'rb');
 537         # should not block
 538         $src = fread($h, $bytes);
 539         fclose($h);
 540         $enc = '';
 541         for ($i = 0; $i < $bytes; $i++) {
 542                 $enc .= sprintf("%02x", (ord($src[$i])));
 543         }
 544         return $enc;
 545 }
 546
 547 function common_mtrand($bytes) {
 548         $enc = '';
 549         for ($i = 0; $i < $bytes; $i++) {
 550                 $enc .= sprintf("%02x", mt_rand(0, 255));
 551         }
 552         return $enc;
 553 }
 554
 555 function common_set_returnto($url) {
 556         common_ensure_session();
 557         $_SESSION['returnto'] = $url;
 558 }
 559
 560 function common_get_returnto() {
 561         common_ensure_session();
 562         return $_SESSION['returnto'];
 563 }
 564
 565 function common_timestamp() {
 566         return date('YmdHis');
 567 }
 568
 569 // XXX: set up gettext
 570
 571 function _t($str) {
 572         return $str;
 573 }
 574
 575 function common_ensure_syslog() {
 576         static $initialized = false;
 577         if (!$initialized) {
 578                 define_syslog_variables();
 579                 openlog("laconica", 0, LOG_USER);
 580                 $initialized = true;
 581         }
 582 }
 583
 584 function common_log($priority, $msg) {
 585         common_ensure_syslog();
 586         syslog($priority, $msg);
 587 }
 588
 589 function common_debug($msg) {
 590         common_log(LOG_DEBUG, $msg);
 591 }
 592
 593 function common_valid_http_url($url) {
 594         return Validate::uri($url, array('allowed_schemes' => array('http', 'https')));
 595 }