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, $code=500) {
  25         static $status = array(500 => 'Internal Server Error',
  26                                                    501 => 'Not Implemented',
  27                                                    502 => 'Bad Gateway',
  28                                                    503 => 'Service Unavailable',
  29                                                    504 => 'Gateway Timeout',
  30                                                    505 => 'HTTP Version Not Supported');
  31
  32         if (!array_key_exists($code, $status)) {
  33                 $code = 500;
  34         }
  35
  36         $status_string = $status[$code];
  37
  38         header('HTTP/1.1 '.$code.' '.$status_string);
  39         header('Content-type: text/plain');
  40
  41         print $msg;
  42         print "\n";
  43         exit();
  44 }
  45
  46 # Show a user error
  47 function common_user_error($msg, $code=400) {
  48         static $status = array(400 => 'Bad Request',
  49                                                    401 => 'Unauthorized',
  50                                                    402 => 'Payment Required',
  51                                                    403 => 'Forbidden',
  52                                                    404 => 'Not Found',
  53                                                    405 => 'Method Not Allowed',
  54                                                    406 => 'Not Acceptable',
  55                                                    407 => 'Proxy Authentication Required',
  56                                                    408 => 'Request Timeout',
  57                                                    409 => 'Conflict',
  58                                                    410 => 'Gone',
  59                                                    411 => 'Length Required',
  60                                                    412 => 'Precondition Failed',
  61                                                    413 => 'Request Entity Too Large',
  62                                                    414 => 'Request-URI Too Long',
  63                                                    415 => 'Unsupported Media Type',
  64                                                    416 => 'Requested Range Not Satisfiable',
  65                                                    417 => 'Expectation Failed');
  66
  67         if (!array_key_exists($code, $status)) {
  68                 $code = 400;
  69         }
  70
  71         $status_string = $status[$code];
  72
  73         header('HTTP/1.1 '.$code.' '.$status_string);
  74
  75         common_show_header('Error');
  76         common_element('div', array('class' => 'error'), $msg);
  77         common_show_footer();
  78 }
  79
  80 $xw = null;
  81
  82 # Start an HTML element
  83 function common_element_start($tag, $attrs=NULL) {
  84         global $xw;
  85         $xw->startElement($tag);
  86         if (is_array($attrs)) {
  87                 foreach ($attrs as $name => $value) {
  88                         $xw->writeAttribute($name, $value);
  89                 }
  90         } else if (is_string($attrs)) {
  91                 $xw->writeAttribute('class', $attrs);
  92         }
  93 }
  94
  95 function common_element_end($tag) {
  96         global $xw;
  97         $xw->endElement();
  98 }
  99
 100 function common_element($tag, $attrs=NULL, $content=NULL) {
 101     common_element_start($tag, $attrs);
 102         if ($content) {
 103                 global $xw;
 104                 $xw->text($content);
 105         }
 106         common_element_end($tag);
 107 }
 108
 109 function common_start_xml($doc=NULL, $public=NULL, $system=NULL) {
 110         global $xw;
 111         $xw = new XMLWriter();
 112         $xw->openURI('php://output');
 113         $xw->setIndent(true);
 114         $xw->startDocument('1.0', 'UTF-8');
 115         if ($doc) {
 116                 $xw->writeDTD($doc, $public, $system);
 117         }
 118 }
 119
 120 function common_end_xml() {
 121         global $xw;
 122         $xw->endDocument();
 123         $xw->flush();
 124 }
 125
 126 define('PAGE_TYPE_PREFS', 'application/xhtml+xml,text/html;q=0.7,application/xml;q=0.3,text/xml;q=0.2');
 127
 128 function common_show_header($pagetitle, $callable=NULL, $data=NULL, $headercall=NULL) {
 129         global $config, $xw;
 130
 131         $httpaccept = isset($_SERVER['HTTP_ACCEPT']) ? $_SERVER['HTTP_ACCEPT'] : NULL;
 132
 133         # XXX: allow content negotiation for RDF, RSS, or XRDS
 134
 135         $type = common_negotiate_type(common_accept_to_prefs($httpaccept),
 136                                                                   common_accept_to_prefs(PAGE_TYPE_PREFS));
 137
 138         if (!$type) {
 139                 common_client_error(_t('This page is not available in a media type you accept'), 406);
 140                 exit(0);
 141         }
 142
 143         header('Content-Type: '.$type);
 144
 145         common_start_xml('html',
 146                                          '-//W3C//DTD XHTML 1.0 Strict//EN',
 147                                          'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd');
 148
 149         # FIXME: correct language for interface
 150
 151         common_element_start('html', array('xmlns' => 'http://www.w3.org/1999/xhtml',
 152                                                                            'xml:lang' => 'en',
 153                                                                            'lang' => 'en'));
 154
 155         common_element_start('head');
 156         common_element('title', NULL,
 157                                    $pagetitle . " - " . $config['site']['name']);
 158         common_element('link', array('rel' => 'stylesheet',
 159                                                                  'type' => 'text/css',
 160                                                                  'href' => theme_path('display.css'),
 161                                                                  'media' => 'screen, projection, tv'));
 162         foreach (array(6,7) as $ver) {
 163                 if (file_exists(theme_file('ie'.$ver.'.css'))) {
 164                         # Yes, IE people should be put in jail.
 165                         $xw->writeComment('[if lte IE '.$ver.']><link rel="stylesheet" type="text/css" '.
 166                                                           'href="'.theme_path('ie'.$ver.'.css').' /><![endif]');
 167                 }
 168         }
 169
 170         common_element('script', array('type' => 'text/javascript',
 171                                                                    'src' => common_path('js/jquery.min.js')),
 172                                    ' ');
 173
 174         if ($callable) {
 175                 if ($data) {
 176                         call_user_func($callable, $data);
 177                 } else {
 178                         call_user_func($callable);
 179                 }
 180         }
 181         common_element_end('head');
 182         common_element_start('body');
 183         common_element_start('div', array('id' => 'wrap'));
 184         common_element_start('div', array('id' => 'header'));
 185         common_nav_menu();
 186         if ((is_string($config['site']['logo']) && (strlen($config['site']['logo']) > 0))
 187                 || file_exists(theme_file('logo.png')))
 188         {
 189                 common_element_start('a', array('href' => common_local_url('public')));
 190                 common_element('img', array('src' => ($config['site']['logo']) ?
 191                                                                         ($config['site']['logo']) : theme_path('logo.png'),
 192                                                                         'alt' => $config['site']['name'],
 193                                                                         'id' => 'logo'));
 194                 common_element_end('a');
 195         } else {
 196                 common_element_start('p', array('id' => 'branding'));
 197                 common_element('a', array('href' => common_local_url('public')),
 198                                            $config['site']['name']);
 199                 common_element_end('p');
 200         }
 201
 202         common_element('h1', 'pagetitle', $pagetitle);
 203
 204         if ($headercall) {
 205                 if ($data) {
 206                         call_user_func($headercall, $data);
 207                 } else {
 208                         call_user_func($headercall);
 209                 }
 210         }
 211         common_element_end('div');
 212         common_element_start('div', array('id' => 'content'));
 213 }
 214
 215 function common_show_footer() {
 216         global $xw, $config;
 217         common_element_end('div'); # content div
 218         common_foot_menu();
 219         common_element_start('div', array('id' => 'footer'));
 220         common_element_start('p', 'laconica');
 221         common_text(_t('This site is running the '));
 222         common_element('a', array('class' => 'software',
 223                                                           href => 'http://laconi.ca/'),
 224                                    'Laconica');
 225         common_text(_t('microblogging tool, version ' . LACONICA_VERSION . ', available under the '));
 226         common_element('a', array(href => 'http://www.fsf.org/licensing/licenses/agpl-3.0.html'),
 227                                    'GNU Affero General Public License');
 228         common_text(_t('.'));
 229         common_element_end('p');
 230         common_element('img', array('id' => 'cc',
 231                                                                 'src' => $config['license']['image'],
 232                                                                 'alt' => $config['license']['title']));
 233         common_element_start('p');
 234         common_text(_t('Unless otherwise specified, contents of this site are copyright by the contributors and available under the '));
 235         common_element('a', array('class' => 'license',
 236                                                           'rel' => 'license',
 237                                                           href => $config['license']['url']),
 238                                    $config['license']['title']);
 239         common_text(_t('. Contributors should be attributed by full name or nickname.'));
 240         common_element_end('p');
 241         common_element_end('div');
 242         common_element_end('div');
 243         common_element_end('body');
 244         common_element_end('html');
 245         common_end_xml();
 246 }
 247
 248 function common_text($txt) {
 249         global $xw;
 250         $xw->text($txt);
 251 }
 252
 253 function common_raw($xml) {
 254         global $xw;
 255         $xw->writeRaw($xml);
 256 }
 257
 258 function common_nav_menu() {
 259         $user = common_current_user();
 260         common_element_start('ul', array('id' => 'nav'));
 261         if ($user) {
 262                 common_menu_item(common_local_url('all', array('nickname' => $user->nickname)),
 263                                                  _t('Home'));
 264         }
 265         common_menu_item(common_local_url('public'), _t('Public'));
 266         common_menu_item(common_local_url('doc', array('title' => 'help')),
 267                                          _t('Help'));
 268         if ($user) {
 269                 common_menu_item(common_local_url('profilesettings'),
 270                                                  _t('Settings'));
 271                 common_menu_item(common_local_url('logout'),
 272                                                  _t('Logout'));
 273         } else {
 274                 common_menu_item(common_local_url('login'), _t('Login'));
 275                 common_menu_item(common_local_url('register'), _t('Register'));
 276                 common_menu_item(common_local_url('openidlogin'), _t('OpenID'));
 277         }
 278         common_element_end('ul');
 279 }
 280
 281 function common_foot_menu() {
 282         common_element_start('ul', array('id' => 'nav_sub'));
 283         common_menu_item(common_local_url('doc', array('title' => 'about')),
 284                                          _t('About'));
 285         common_menu_item(common_local_url('doc', array('title' => 'privacy')),
 286                                          _t('Privacy'));
 287         common_menu_item(common_local_url('doc', array('title' => 'source')),
 288                                          _t('Source'));
 289         common_element_end('ul');
 290 }
 291
 292 function common_menu_item($url, $text, $title=NULL, $is_selected=false) {
 293         $lattrs = array();
 294         if ($is_selected) {
 295                 $lattrs['class'] = 'current';
 296         }
 297         common_element_start('li', $lattrs);
 298         $attrs['href'] = $url;
 299         if ($title) {
 300                 $attrs['title'] = $title;
 301         }
 302         common_element('a', $attrs, $text);
 303         common_element_end('li');
 304 }
 305
 306 function common_input($id, $label, $value=NULL,$instructions=NULL) {
 307         common_element_start('p');
 308         common_element('label', array('for' => $id), $label);
 309         $attrs = array('name' => $id,
 310                                    'type' => 'text',
 311                                    'id' => $id);
 312         if ($value) {
 313                 $attrs['value'] = htmlspecialchars($value);
 314         }
 315         common_element('input', $attrs);
 316         if ($instructions) {
 317                 common_element('span', 'input_instructions', $instructions);
 318         }
 319         common_element_end('p');
 320 }
 321
 322 function common_checkbox($id, $label, $instructions=NULL, $value='true')
 323 {
 324         common_element_start('p');
 325         $attrs = array('name' => $id,
 326                                    'type' => 'checkbox',
 327                                    'id' => $id,
 328                                    'value' => $value);
 329         if ($value) {
 330                 $attrs['value'] = htmlspecialchars($value);
 331         }
 332         common_element('input', $attrs);
 333         common_element('label', array('for' => $id), $label);
 334         if ($instructions) {
 335                 common_element('span', 'input_instructions', $instructions);
 336         }
 337         common_element_end('p');
 338 }
 339
 340 function common_hidden($id, $value) {
 341         common_element('input', array('name' => $id,
 342                                                                   'type' => 'hidden',
 343                                                                   'id' => $id,
 344                                                                   'value' => $value));
 345 }
 346
 347 function common_password($id, $label, $instructions=NULL) {
 348         common_element_start('p');
 349         common_element('label', array('for' => $id), $label);
 350         $attrs = array('name' => $id,
 351                                    'type' => 'password',
 352                                    'id' => $id);
 353         common_element('input', $attrs);
 354         if ($instructions) {
 355                 common_element('span', 'input_instructions', $instructions);
 356         }
 357         common_element_end('p');
 358 }
 359
 360 function common_submit($id, $label) {
 361         global $xw;
 362         common_element_start('p');
 363         common_element('input', array('type' => 'submit',
 364                                                                   'id' => $id,
 365                                                                   'name' => $id,
 366                                                                   'class' => 'submit',
 367                                                                   'value' => $label));
 368         common_element_end('p');
 369 }
 370
 371 function common_textarea($id, $label, $content=NULL, $instructions=NULL) {
 372         common_element_start('p');
 373         common_element('label', array('for' => $id), $label);
 374         common_element('textarea', array('rows' => 3,
 375                                                                          'cols' => 40,
 376                                                                          'name' => $id,
 377                                                                          'id' => $id),
 378                                    ($content) ? $content : ' ');
 379         if ($instructions) {
 380                 common_element('span', 'input_instructions', $instructions);
 381         }
 382         common_element_end('p');
 383 }
 384
 385 # salted, hashed passwords are stored in the DB
 386
 387 function common_munge_password($password, $id) {
 388         return md5($password . $id);
 389 }
 390
 391 # check if a username exists and has matching password
 392 function common_check_user($nickname, $password) {
 393         $user = User::staticGet('nickname', $nickname);
 394         if (is_null($user)) {
 395                 return false;
 396         } else {
 397                 return (0 == strcmp(common_munge_password($password, $user->id),
 398                                                         $user->password));
 399         }
 400 }
 401
 402 # is the current user logged in?
 403 function common_logged_in() {
 404         return (!is_null(common_current_user()));
 405 }
 406
 407 function common_have_session() {
 408         return (0 != strcmp(session_id(), ''));
 409 }
 410
 411 function common_ensure_session() {
 412         if (!common_have_session()) {
 413                 @session_start();
 414         }
 415 }
 416
 417 function common_set_user($nickname) {
 418         if (is_null($nickname) && common_have_session()) {
 419                 unset($_SESSION['userid']);
 420                 return true;
 421         } else {
 422                 $user = User::staticGet('nickname', $nickname);
 423                 if ($user) {
 424                         common_ensure_session();
 425                         $_SESSION['userid'] = $user->id;
 426                         return true;
 427                 } else {
 428                         return false;
 429                 }
 430         }
 431         return false;
 432 }
 433
 434 function common_set_cookie($key, $value, $expiration=0) {
 435         $path = common_config('site', 'path');
 436         $server = common_config('site', 'server');
 437
 438         if ($path && ($path != '/')) {
 439                 $cookiepath = '/' . $path . '/';
 440         } else {
 441                 $cookiepath = '/';
 442         }
 443         return setcookie($key,
 444                          $value,
 445                                  $expiration,
 446                                          $cookiepath,
 447                                      $server);
 448 }
 449
 450 define('REMEMBERME', 'rememberme');
 451 define('REMEMBERME_EXPIRY', round(30 * 24 * 60 * 60));
 452
 453 function common_rememberme() {
 454         $user = common_current_user();
 455         if (!$user) {
 456                 return false;
 457         }
 458         $rm = new Remember_me();
 459         $rm->code = common_good_rand(16);
 460         $rm->user_id = $user->id();
 461         if (!$rm->insert()) {
 462                 common_log_db_error($rm, 'INSERT', __FILE__);
 463                 return false;
 464         }
 465         common_set_cookie(REMEMBERME,
 466                                           $rm->user_id . ':' . $rm->code,
 467                                           time() + REMEMBERME_EXPIRY);
 468 }
 469
 470 function common_remembered_user() {
 471         $user = NULL;
 472         # Try to remember
 473         $packed = $_COOKIE[REMEMBERME];
 474         if ($packed) {
 475                 list($id, $code) = explode(':', $packed);
 476                 if ($id && $code) {
 477                         $rm = Remember_me::staticGet($code);
 478                         if ($rm && $rm->user_id == $id) {
 479                                 $user = User::staticGet($rm->id);
 480                                 if ($user) {
 481                                         # successful!
 482                                         $result = $rm->delete();
 483                                         if (!$result) {
 484                                                 common_log_db_error($rm, 'DELETE', __FILE__);
 485                                                 $user = NULL;
 486                                         } else {
 487                                                 common_set_user($user);
 488                                                 common_real_login(false);
 489                                                 # We issue a new cookie, so they can log in
 490                                                 # automatically again after this session
 491                                                 common_rememberme();
 492                                         }
 493                                 }
 494                         }
 495                 }
 496         }
 497         return $user;
 498 }
 499
 500 # must be called with a valid user!
 501
 502 function common_forgetme() {
 503         common_set_cookie(REMEMBERME, '', 0);
 504 }
 505
 506 # who is the current user?
 507 function common_current_user() {
 508
 509         if (common_have_session()) {
 510                 $id = $_SESSION['userid'];
 511                 if ($id) {
 512                         # note: this should cache
 513                         $user = User::staticGet($id);
 514                         return $user;
 515                 }
 516         }
 517
 518         # that didn't work; try to remember
 519         $user = common_remembered_user();
 520         return $user;
 521 }
 522
 523 # Logins that are 'remembered' aren't 'real' -- they're subject to
 524 # cookie-stealing. So, we don't let them do certain things. New reg,
 525 # OpenID, and password logins _are_ real.
 526
 527 function common_real_login($real=true) {
 528         common_ensure_session();
 529         $_SESSION['real_login'] = $real;
 530 }
 531
 532 function common_is_real_login() {
 533         return common_logged_in() && $_SESSION['real_login'];
 534 }
 535
 536 # get canonical version of nickname for comparison
 537 function common_canonical_nickname($nickname) {
 538         # XXX: UTF-8 canonicalization (like combining chars)
 539         return strtolower($nickname);
 540 }
 541
 542 # get canonical version of email for comparison
 543 function common_canonical_email($email) {
 544         # XXX: canonicalize UTF-8
 545         # XXX: lcase the domain part
 546         return $email;
 547 }
 548
 549 define('URL_REGEX', '^|[ \t\r\n])((ftp|http|https|gopher|mailto|news|nntp|telnet|wais|file|prospero|aim|webcal):(([A-Za-z0-9$_.+!*(),;/?:@&~=-])|%[A-Fa-f0-9]{2}){2,}(#([a-zA-Z0-9][a-zA-Z0-9$_.+!*(),;/?:@&~=%-]*))?([A-Za-z0-9$_+!*();/?:~-]))');
 550
 551 function common_render_content($text, $notice) {
 552         $r = htmlspecialchars($text);
 553         $id = $notice->profile_id;
 554         $r = preg_replace('@https?://\S+@', '<a href="\0" class="extlink">\0</a>', $r);
 555         $r = preg_replace('/(^|\s+)@([a-z0-9]{1,64})/e', "'\\1@'.common_at_link($id, '\\2')", $r);
 556         # XXX: # tags
 557         # XXX: machine tags
 558         return $r;
 559 }
 560
 561 function common_at_link($sender_id, $nickname) {
 562         # Try to find profiles this profile is subscribed to that have this nickname
 563         $recipient = new Profile();
 564         # XXX: chokety and bad
 565         $recipient->whereAdd('EXISTS (SELECT subscribed from subscription where subscriber = '.$sender_id.' and subscribed = id)', 'AND');
 566         $recipient->whereAdd('nickname = "' . trim($nickname) . '"', 'AND');
 567         if ($recipient->find(TRUE)) {
 568                 return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink tolistenee">'.$nickname.'</a>';
 569         }
 570         # Try to find profiles that listen to this profile and that have this nickname
 571         $recipient = new Profile();
 572         # XXX: chokety and bad
 573         $recipient->whereAdd('EXISTS (SELECT subscriber from subscription where subscribed = '.$sender_id.' and subscriber = id)', 'AND');
 574         $recipient->whereAdd('nickname = "' . trim($nickname) . '"', 'AND');
 575         if ($recipient->find(TRUE)) {
 576                 return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink tolistener">'.$nickname.'</a>';
 577         }
 578         # If this is a local user, try to find a local user with that nickname.
 579         $sender = User::staticGet($sender_id);
 580         if ($sender) {
 581                 $recipient_user = User::staticGet('nickname', $nickname);
 582                 if ($recipient_user) {
 583                         return '<a href="'.htmlspecialchars(common_profile_url($nickname)).'" class="atlink usertouser">'.$nickname.'</a>';
 584                 }
 585         }
 586         # Otherwise, no links. @messages from local users to remote users,
 587         # or from remote users to other remote users, are just
 588         # outside our ability to make intelligent guesses about
 589         return $nickname;
 590 }
 591
 592 // where should the avatar go for this user?
 593
 594 function common_avatar_filename($id, $extension, $size=NULL, $extra=NULL) {
 595         global $config;
 596
 597         if ($size) {
 598                 return $id . '-' . $size . (($extra) ? ('-' . $extra) : '') . $extension;
 599         } else {
 600                 return $id . '-original' . (($extra) ? ('-' . $extra) : '') . $extension;
 601         }
 602 }
 603
 604 function common_avatar_path($filename) {
 605         global $config;
 606         return INSTALLDIR . '/avatar/' . $filename;
 607 }
 608
 609 function common_avatar_url($filename) {
 610         return common_path('avatar/'.$filename);
 611 }
 612
 613 function common_default_avatar($size) {
 614         static $sizenames = array(AVATAR_PROFILE_SIZE => 'profile',
 615                                                           AVATAR_STREAM_SIZE => 'stream',
 616                                                           AVATAR_MINI_SIZE => 'mini');
 617         return theme_path('default-avatar-'.$sizenames[$size].'.png');
 618 }
 619
 620 function common_local_url($action, $args=NULL) {
 621         global $config;
 622         if ($config['site']['fancy']) {
 623                 return common_fancy_url($action, $args);
 624         } else {
 625                 return common_simple_url($action, $args);
 626         }
 627 }
 628
 629 function common_fancy_url($action, $args=NULL) {
 630         switch (strtolower($action)) {
 631          case 'public':
 632                 if ($args && $args['page']) {
 633                         return common_path('?page=' . $args['page']);
 634                 } else {
 635                         return common_path('');
 636                 }
 637          case 'publicrss':
 638                 return common_path('rss');
 639          case 'publicxrds':
 640                 return common_path('xrds');
 641          case 'doc':
 642                 return common_path('doc/'.$args['title']);
 643          case 'login':
 644          case 'logout':
 645          case 'register':
 646          case 'subscribe':
 647          case 'unsubscribe':
 648                 return common_path('main/'.$action);
 649          case 'openidlogin':
 650                 return common_path('main/openid');
 651          case 'avatar':
 652          case 'password':
 653                 return common_path('settings/'.$action);
 654          case 'profilesettings':
 655                 return common_path('settings/profile');
 656          case 'openidsettings':
 657                 return common_path('settings/openid');
 658          case 'newnotice':
 659                 return common_path('notice/new');
 660          case 'shownotice':
 661                 return common_path('notice/'.$args['notice']);
 662          case 'xrds':
 663          case 'foaf':
 664                 return common_path($args['nickname'].'/'.$action);
 665          case 'subscriptions':
 666          case 'subscribers':
 667          case 'all':
 668                 if ($args && $args['page']) {
 669                         return common_path($args['nickname'].'/'.$action.'?page=' . $args['page']);
 670                 } else {
 671                         return common_path($args['nickname'].'/'.$action);
 672                 }
 673          case 'allrss':
 674                 return common_path($args['nickname'].'/all/rss');
 675          case 'userrss':
 676                 return common_path($args['nickname'].'/rss');
 677          case 'showstream':
 678                 if ($args && $args['page']) {
 679                         return common_path($args['nickname'].'?page=' . $args['page']);
 680                 } else {
 681                         return common_path($args['nickname']);
 682                 }
 683          case 'confirmaddress':
 684                 return common_path('main/confirmaddress/'.$args['code']);
 685          case 'userbyid':
 686                 return common_path('user/'.$args['id']);
 687          default:
 688                 return common_simple_url($action, $args);
 689         }
 690 }
 691
 692 function common_simple_url($action, $args=NULL) {
 693         global $config;
 694         /* XXX: pretty URLs */
 695         $extra = '';
 696         if ($args) {
 697                 foreach ($args as $key => $value) {
 698                         $extra .= "&${key}=${value}";
 699                 }
 700         }
 701         return common_path("index.php?action=${action}${extra}");
 702 }
 703
 704 function common_path($relative) {
 705         global $config;
 706         $pathpart = ($config['site']['path']) ? $config['site']['path']."/" : '';
 707         return "http://".$config['site']['server'].'/'.$pathpart.$relative;
 708 }
 709
 710 function common_date_string($dt) {
 711         // XXX: do some sexy date formatting
 712         // return date(DATE_RFC822, $dt);
 713         return $dt;
 714 }
 715
 716 function common_date_w3dtf($dt) {
 717         $t = strtotime($dt);
 718         return date(DATE_W3C, $t);
 719 }
 720
 721 function common_redirect($url, $code=307) {
 722         static $status = array(301 => "Moved Permanently",
 723                                                    302 => "Found",
 724                                                    303 => "See Other",
 725                                                    307 => "Temporary Redirect");
 726         header("Status: ${code} $status[$code]");
 727         header("Location: $url");
 728
 729         common_start_xml('a',
 730                                          '-//W3C//DTD XHTML 1.0 Strict//EN',
 731                                          'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd');
 732         common_element('a', array('href' => $url), $url);
 733         common_end_xml();
 734 }
 735
 736 function common_broadcast_notice($notice, $remote=false) {
 737         // XXX: optionally use a queue system like http://code.google.com/p/microapps/wiki/NQDQ
 738         if (!$remote) {
 739                 # Make sure we have the OMB stuff
 740                 require_once(INSTALLDIR.'/lib/omb.php');
 741                 omb_broadcast_remote_subscribers($notice);
 742         }
 743         require_once(INSTALLDIR.'/lib/jabber.php');
 744         jabber_broadcast_notice($notice);
 745         // XXX: broadcast notices to SMS
 746         // XXX: broadcast notices to other IM
 747         return true;
 748 }
 749
 750 function common_broadcast_profile($profile) {
 751         // XXX: optionally use a queue system like http://code.google.com/p/microapps/wiki/NQDQ
 752         require_once(INSTALLDIR.'/lib/omb.php');
 753         omb_broadcast_profile($profile);
 754         // XXX: Other broadcasts...?
 755         return true;
 756 }
 757
 758 function common_profile_url($nickname) {
 759         return common_local_url('showstream', array('nickname' => $nickname));
 760 }
 761
 762 # Don't call if nobody's logged in
 763
 764 function common_notice_form($action=NULL) {
 765         $user = common_current_user();
 766         assert(!is_null($user));
 767         common_element_start('form', array('id' => 'status_form',
 768                                                                            'method' => 'POST',
 769                                                                            'action' => common_local_url('newnotice')));
 770         common_element_start('p');
 771         common_element('label', array('for' => 'status_update',
 772                                                                   'id' => 'status_label'),
 773                                    _t('What\'s up, ').$user->nickname.'?');
 774         common_element('textarea', array('id' => 'status_textarea',
 775                                                                          'name' => 'status_textarea'),
 776                                    ' ');
 777         if ($action) {
 778                 common_hidden('returnto', $action);
 779         }
 780         common_element('input', array('id' => 'status_submit',
 781                                                                   'name' => 'status_submit',
 782                                                                   'type' => 'submit',
 783                                                                   'value' => _t('Send')));
 784         common_element_end('p');
 785         common_element_end('form');
 786 }
 787
 788 function common_mint_tag($extra) {
 789         global $config;
 790         return
 791           'tag:'.$config['tag']['authority'].','.
 792           $config['tag']['date'].':'.$config['tag']['prefix'].$extra;
 793 }
 794
 795 # Should make up a reasonable root URL
 796
 797 function common_root_url() {
 798         return common_path('');
 799 }
 800
 801 # returns $bytes bytes of random data as a hexadecimal string
 802 # "good" here is a goal and not a guarantee
 803
 804 function common_good_rand($bytes) {
 805         # XXX: use random.org...?
 806         if (file_exists('/dev/urandom')) {
 807                 return common_urandom($bytes);
 808         } else { # FIXME: this is probably not good enough
 809                 return common_mtrand($bytes);
 810         }
 811 }
 812
 813 function common_urandom($bytes) {
 814         $h = fopen('/dev/urandom', 'rb');
 815         # should not block
 816         $src = fread($h, $bytes);
 817         fclose($h);
 818         $enc = '';
 819         for ($i = 0; $i < $bytes; $i++) {
 820                 $enc .= sprintf("%02x", (ord($src[$i])));
 821         }
 822         return $enc;
 823 }
 824
 825 function common_mtrand($bytes) {
 826         $enc = '';
 827         for ($i = 0; $i < $bytes; $i++) {
 828                 $enc .= sprintf("%02x", mt_rand(0, 255));
 829         }
 830         return $enc;
 831 }
 832
 833 function common_set_returnto($url) {
 834         common_ensure_session();
 835         $_SESSION['returnto'] = $url;
 836 }
 837
 838 function common_get_returnto() {
 839         common_ensure_session();
 840         return $_SESSION['returnto'];
 841 }
 842
 843 function common_timestamp() {
 844         return date('YmdHis');
 845 }
 846
 847 // XXX: set up gettext
 848
 849 function _t($str) {
 850         return $str;
 851 }
 852
 853 function common_ensure_syslog() {
 854         static $initialized = false;
 855         if (!$initialized) {
 856                 global $config;
 857                 define_syslog_variables();
 858                 openlog($config['syslog']['appname'], 0, LOG_USER);
 859                 $initialized = true;
 860         }
 861 }
 862
 863 function common_log($priority, $msg, $filename=NULL) {
 864         common_ensure_syslog();
 865         syslog($priority, $msg);
 866 }
 867
 868 function common_debug($msg, $filename=NULL) {
 869         if ($filename) {
 870                 common_log(LOG_DEBUG, basename($filename).' - '.$msg);
 871         } else {
 872                 common_log(LOG_DEBUG, $msg);
 873         }
 874 }
 875
 876 function common_log_db_error(&$object, $verb, $filename=NULL) {
 877         $objstr = common_log_objstring($object);
 878         $last_error = &PEAR::getStaticProperty('DB_DataObject','lastError');
 879         common_log(LOG_ERROR, $last_error->message . '(' . $verb . ' on ' . $objstr . ')', $filename);
 880 }
 881
 882 function common_log_objstring(&$object) {
 883         if (is_null($object)) {
 884                 return "NULL";
 885         }
 886         $arr = $object->toArray();
 887         $fields = array();
 888         foreach ($arr as $k => $v) {
 889                 $fields[] = "$k='$v'";
 890         }
 891         $objstring = $object->tableName() . '[' . implode(',', $fields) . ']';
 892         return $objstring;
 893 }
 894
 895 function common_valid_http_url($url) {
 896         return Validate::uri($url, array('allowed_schemes' => array('http', 'https')));
 897 }
 898
 899 function common_valid_tag($tag) {
 900         if (preg_match('/^tag:(.*?),(\d{4}(-\d{2}(-\d{2})?)?):(.*)$/', $tag, $matches)) {
 901                 return (Validate::email($matches[1]) ||
 902                                 preg_match('/^([\w-\.]+)$/', $matches[1]));
 903         }
 904         return false;
 905 }
 906
 907 # Does a little before-after block for next/prev page
 908
 909 function common_pagination($have_before, $have_after, $page, $action, $args=NULL) {
 910
 911         if ($have_before || $have_after) {
 912                 common_element_start('div', array('id' => 'pagination'));
 913                 common_element_start('ul', array('id' => 'nav_pagination'));
 914         }
 915
 916         if ($have_before) {
 917                 $pargs = array('page' => $page-1);
 918                 $newargs = ($args) ? array_merge($args,$pargs) : $pargs;
 919
 920                 common_element_start('li', 'before');
 921                 common_element('a', array('href' => common_local_url($action, $newargs)),
 922                                            _t('« After'));
 923                 common_element_end('li');
 924         }
 925
 926         if ($have_after) {
 927                 $pargs = array('page' => $page+1);
 928                 $newargs = ($args) ? array_merge($args,$pargs) : $pargs;
 929                 common_element_start('li', 'after');
 930                 common_element('a', array('href' => common_local_url($action, $newargs)),
 931                                                    _t('Before »'));
 932                 common_element_end('li');
 933         }
 934
 935         if ($have_before || $have_after) {
 936                 common_element_end('ul');
 937                 common_element_end('div');
 938         }
 939 }
 940
 941 /* Following functions are copied from MediaWiki GlobalFunctions.php
 942  * and written by Evan Prodromou. */
 943
 944 function common_accept_to_prefs($accept, $def = '*/*') {
 945         # No arg means accept anything (per HTTP spec)
 946         if(!$accept) {
 947                 return array($def => 1);
 948         }
 949
 950         $prefs = array();
 951
 952         $parts = explode(',', $accept);
 953
 954         foreach($parts as $part) {
 955                 # FIXME: doesn't deal with params like 'text/html; level=1'
 956                 @list($value, $qpart) = explode(';', $part);
 957                 $match = array();
 958                 if(!isset($qpart)) {
 959                         $prefs[$value] = 1;
 960                 } elseif(preg_match('/q\s*=\s*(\d*\.\d+)/', $qpart, $match)) {
 961                         $prefs[$value] = $match[1];
 962                 }
 963         }
 964
 965         return $prefs;
 966 }
 967
 968 function common_mime_type_match($type, $avail) {
 969         if(array_key_exists($type, $avail)) {
 970                 return $type;
 971         } else {
 972                 $parts = explode('/', $type);
 973                 if(array_key_exists($parts[0] . '/*', $avail)) {
 974                         return $parts[0] . '/*';
 975                 } elseif(array_key_exists('*/*', $avail)) {
 976                         return '*/*';
 977                 } else {
 978                         return NULL;
 979                 }
 980         }
 981 }
 982
 983 function common_negotiate_type($cprefs, $sprefs) {
 984         $combine = array();
 985
 986         foreach(array_keys($sprefs) as $type) {
 987                 $parts = explode('/', $type);
 988                 if($parts[1] != '*') {
 989                         $ckey = common_mime_type_match($type, $cprefs);
 990                         if($ckey) {
 991                                 $combine[$type] = $sprefs[$type] * $cprefs[$ckey];
 992                         }
 993                 }
 994         }
 995
 996         foreach(array_keys($cprefs) as $type) {
 997                 $parts = explode('/', $type);
 998                 if($parts[1] != '*' && !array_key_exists($type, $sprefs)) {
 999                         $skey = common_mime_type_match($type, $sprefs);
1000                         if($skey) {
1001                                 $combine[$type] = $sprefs[$skey] * $cprefs[$type];
1002                         }
1003                 }
1004         }
1005
1006         $bestq = 0;
1007         $besttype = NULL;
1008
1009         foreach(array_keys($combine) as $type) {
1010                 if($combine[$type] > $bestq) {
1011                         $besttype = $type;
1012                         $bestq = $combine[$type];
1013                 }
1014         }
1015
1016         return $besttype;
1017 }
1018
1019 function common_config($main, $sub) {
1020         global $config;
1021         return $config[$main][$sub];
1022 }
1023
1024 function common_copy_args($from) {
1025         $to = array();
1026         $strip = get_magic_quotes_gpc();
1027         foreach ($from as $k => $v) {
1028                 $to[$k] = ($strip) ? stripslashes($v) : $v;
1029         }
1030         return $to;
1031 }
1032
1033 function common_user_uri(&$user) {
1034         return common_local_url('userbyid', array('id' => $user->id));
1035 }
1036
1037 function common_notice_uri(&$notice) {
1038         return common_local_url('shownotice',
1039                 array('notice' => $notice->id));
1040 }
1041
1042 # 36 alphanums - lookalikes (0, O, 1, I) = 32 chars = 5 bits
1043
1044 function common_confirmation_code($bits) {
1045         # 36 alphanums - lookalikes (0, O, 1, I) = 32 chars = 5 bits
1046         static $codechars = '23456789ABCDEFGHJKLMNPQRSTUVWXYZ';
1047         $chars = ceil($bits/5);
1048         $code = '';
1049         for ($i = 0; $i < $chars; $i++) {
1050                 # XXX: convert to string and back
1051                 $num = hexdec(common_good_rand(1));
1052                 $code .= $codechars[$num%32];
1053         }
1054         return $code;
1055 }