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         static $empty_tag = array('base', 'meta', 'link', 'hr',
  97                                                           'br', 'param', 'img', 'area',
  98                                                           'input', 'col');
  99         global $xw;
 100         # XXX: check namespace
 101         if (in_array($tag, $empty_tag)) {
 102                 $xw->endElement();
 103         } else {
 104                 $xw->fullEndElement();
 105         }
 106 }
 107
 108 function common_element($tag, $attrs=NULL, $content=NULL) {
 109         common_element_start($tag, $attrs);
 110         global $xw;
 111         if (!is_null($content)) {
 112                 $xw->text($content);
 113         }
 114         common_element_end($tag);
 115 }
 116
 117 function common_start_xml($doc=NULL, $public=NULL, $system=NULL) {
 118         global $xw;
 119         $xw = new XMLWriter();
 120         $xw->openURI('php://output');
 121         $xw->setIndent(true);
 122         $xw->startDocument('1.0', 'UTF-8');
 123         if ($doc) {
 124                 $xw->writeDTD($doc, $public, $system);
 125         }
 126 }
 127
 128 function common_end_xml() {
 129         global $xw;
 130         $xw->endDocument();
 131         $xw->flush();
 132 }
 133
 134 function common_init_language() {
 135         mb_internal_encoding('UTF-8');
 136         $language = common_language();
 137         # So we don't have to make people install the gettext locales
 138         putenv('LANGUAGE='.$language);
 139         putenv('LANG='.$language);
 140         $locale_set = setlocale(LC_ALL, $language . ".utf8",
 141                                                         $language . ".UTF8",
 142                                                         $language . ".utf-8",
 143                                                         $language . ".UTF-8",
 144                                                         $language);
 145         bindtextdomain("laconica", common_config('site','locale_path'));
 146         bind_textdomain_codeset("laconica", "UTF-8");
 147         textdomain("laconica");
 148         setlocale(LC_CTYPE, 'C');
 149         if(!$locale_set) {
 150                 common_log(LOG_INFO,'Language requested:'.$language.' - locale could not be set:',__FILE__);
 151         }
 152 }
 153
 154 define('PAGE_TYPE_PREFS', 'text/html,application/xhtml+xml,application/xml;q=0.3,text/xml;q=0.2');
 155
 156 function common_show_header($pagetitle, $callable=NULL, $data=NULL, $headercall=NULL) {
 157
 158         global $config, $xw;
 159
 160         common_start_html();
 161
 162         common_element_start('head');
 163         common_element('title', NULL,
 164                                    $pagetitle . " - " . $config['site']['name']);
 165         common_element('link', array('rel' => 'stylesheet',
 166                                                                  'type' => 'text/css',
 167                                                                  'href' => theme_path('display.css') . '?version=' . LACONICA_VERSION,
 168                                                                  'media' => 'screen, projection, tv'));
 169         foreach (array(6,7) as $ver) {
 170                 if (file_exists(theme_file('ie'.$ver.'.css'))) {
 171                         # Yes, IE people should be put in jail.
 172                         $xw->writeComment('[if lte IE '.$ver.']><link rel="stylesheet" type="text/css" '.
 173                                                           'href="'.theme_path('ie'.$ver.'.css').'?version='.LACONICA_VERSION.'" /><![endif]');
 174                 }
 175         }
 176
 177         common_element('script', array('type' => 'text/javascript',
 178                                                                    'src' => common_path('js/jquery.min.js')),
 179                                    ' ');
 180         common_element('script', array('type' => 'text/javascript',
 181                                                                    'src' => common_path('js/jquery.form.js')),
 182                                    ' ');
 183         common_element('script', array('type' => 'text/javascript',
 184                                                                    'src' => common_path('js/util.js?version='.LACONICA_VERSION)),
 185                                    ' ');
 186         common_element('link', array('rel' => 'search', 'type' => 'application/opensearchdescription+xml',
 187                                         'href' =>  common_local_url('opensearch', array('type' => 'people')),
 188                                         'title' => common_config('site', 'name').' People Search'));
 189
 190         common_element('link', array('rel' => 'search', 'type' => 'application/opensearchdescription+xml',
 191                                         'href' =>  common_local_url('opensearch', array('type' => 'notice')),
 192                                         'title' => common_config('site', 'name').' Notice Search'));
 193
 194         if ($callable) {
 195                 if ($data) {
 196                         call_user_func($callable, $data);
 197                 } else {
 198                         call_user_func($callable);
 199                 }
 200         }
 201         common_element_end('head');
 202         common_element_start('body');
 203         common_element_start('div', array('id' => 'wrap'));
 204         common_element_start('div', array('id' => 'header'));
 205         common_nav_menu();
 206         if ((isset($config['site']['logo']) && is_string($config['site']['logo']) && (strlen($config['site']['logo']) > 0))
 207                 || file_exists(theme_file('logo.png')))
 208         {
 209                 common_element_start('a', array('href' => common_local_url('public')));
 210                 common_element('img', array('src' => isset($config['site']['logo']) ?
 211                                                                         ($config['site']['logo']) : theme_path('logo.png'),
 212                                                                         'alt' => $config['site']['name'],
 213                                                                         'id' => 'logo'));
 214                 common_element_end('a');
 215         } else {
 216                 common_element_start('p', array('id' => 'branding'));
 217                 common_element('a', array('href' => common_local_url('public')),
 218                                            $config['site']['name']);
 219                 common_element_end('p');
 220         }
 221
 222         common_element('h1', 'pagetitle', $pagetitle);
 223
 224         if ($headercall) {
 225                 if ($data) {
 226                         call_user_func($headercall, $data);
 227                 } else {
 228                         call_user_func($headercall);
 229                 }
 230         }
 231         common_element_end('div');
 232         common_element_start('div', array('id' => 'content'));
 233 }
 234
 235 function common_start_html($type=NULL) {
 236
 237         if (!$type) {
 238                 $httpaccept = isset($_SERVER['HTTP_ACCEPT']) ? $_SERVER['HTTP_ACCEPT'] : NULL;
 239
 240                 # XXX: allow content negotiation for RDF, RSS, or XRDS
 241
 242                 $type = common_negotiate_type(common_accept_to_prefs($httpaccept),
 243                                                                           common_accept_to_prefs(PAGE_TYPE_PREFS));
 244
 245                 if (!$type) {
 246                         common_user_error(_('This page is not available in a media type you accept'), 406);
 247                         exit(0);
 248                 }
 249         }
 250
 251         header('Content-Type: '.$type);
 252
 253         common_start_xml('html',
 254                                          '-//W3C//DTD XHTML 1.0 Strict//EN',
 255                                          'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd');
 256
 257         # FIXME: correct language for interface
 258
 259         $language = common_language();
 260
 261         common_element_start('html', array('xmlns' => 'http://www.w3.org/1999/xhtml',
 262                                                                            'xml:lang' => $language,
 263                                                                            'lang' => $language));
 264 }
 265
 266 function common_show_footer() {
 267         global $xw, $config;
 268         common_element_end('div'); # content div
 269         common_foot_menu();
 270         common_element_start('div', array('id' => 'footer'));
 271         common_element_start('div', 'laconica');
 272         if (common_config('site', 'broughtby')) {
 273                 $instr = _('**%%site.name%%** is a microblogging service brought to you by [%%site.broughtby%%](%%site.broughtbyurl%%). ');
 274         } else {
 275                 $instr = _('**%%site.name%%** is a microblogging service. ');
 276         }
 277         $instr .= sprintf(_('It runs the [Laconica](http://laconi.ca/) microblogging software, version %s, available under the [GNU Affero General Public License](http://www.fsf.org/licensing/licenses/agpl-3.0.html).'), LACONICA_VERSION);
 278     $output = common_markup_to_html($instr);
 279     common_raw($output);
 280         common_element_end('div');
 281         common_element('img', array('id' => 'cc',
 282                                                                 'src' => $config['license']['image'],
 283                                                                 'alt' => $config['license']['title']));
 284         common_element_start('p');
 285         common_text(_('Unless otherwise specified, contents of this site are copyright by the contributors and available under the '));
 286         common_element('a', array('class' => 'license',
 287                                                           'rel' => 'license',
 288                                                           'href' => $config['license']['url']),
 289                                    $config['license']['title']);
 290         common_text(_('. Contributors should be attributed by full name or nickname.'));
 291         common_element_end('p');
 292         common_element_end('div');
 293         common_element_end('div');
 294         common_element_end('body');
 295         common_element_end('html');
 296         common_end_xml();
 297 }
 298
 299 function common_text($txt) {
 300         global $xw;
 301         $xw->text($txt);
 302 }
 303
 304 function common_raw($xml) {
 305         global $xw;
 306         $xw->writeRaw($xml);
 307 }
 308
 309 function common_nav_menu() {
 310         $user = common_current_user();
 311         common_element_start('ul', array('id' => 'nav'));
 312         if ($user) {
 313                 common_menu_item(common_local_url('all', array('nickname' => $user->nickname)),
 314                                                  _('Home'));
 315         }
 316         common_menu_item(common_local_url('peoplesearch'), _('Search'));
 317         common_menu_item(common_local_url('tags'), _('Tags'));
 318         if ($user) {
 319                 common_menu_item(common_local_url('profilesettings'),
 320                                                  _('Settings'));
 321                 common_menu_item(common_local_url('invite'),
 322                                                  _('Invite'));
 323                 common_menu_item(common_local_url('logout'),
 324                                                  _('Logout'));
 325         } else {
 326                 common_menu_item(common_local_url('login'), _('Login'));
 327                 if (!common_config('site', 'closed')) {
 328                         common_menu_item(common_local_url('register'), _('Register'));
 329                 }
 330                 common_menu_item(common_local_url('openidlogin'), _('OpenID'));
 331         }
 332         common_element_end('ul');
 333 }
 334
 335 function common_foot_menu() {
 336         common_element_start('ul', array('id' => 'nav_sub'));
 337         common_menu_item(common_local_url('doc', array('title' => 'help')),
 338                                          _('Help'));
 339         common_menu_item(common_local_url('doc', array('title' => 'about')),
 340                                          _('About'));
 341         common_menu_item(common_local_url('doc', array('title' => 'faq')),
 342                                          _('FAQ'));
 343         common_menu_item(common_local_url('doc', array('title' => 'privacy')),
 344                                          _('Privacy'));
 345         common_menu_item(common_local_url('doc', array('title' => 'source')),
 346                                          _('Source'));
 347         common_menu_item(common_local_url('doc', array('title' => 'contact')),
 348                                          _('Contact'));
 349         common_element_end('ul');
 350 }
 351
 352 function common_menu_item($url, $text, $title=NULL, $is_selected=false) {
 353         $lattrs = array();
 354         if ($is_selected) {
 355                 $lattrs['class'] = 'current';
 356         }
 357         common_element_start('li', $lattrs);
 358         $attrs['href'] = $url;
 359         if ($title) {
 360                 $attrs['title'] = $title;
 361         }
 362         common_element('a', $attrs, $text);
 363         common_element_end('li');
 364 }
 365
 366 function common_input($id, $label, $value=NULL,$instructions=NULL) {
 367         common_element_start('p');
 368         common_element('label', array('for' => $id), $label);
 369         $attrs = array('name' => $id,
 370                                    'type' => 'text',
 371                                    'class' => 'input_text',
 372                                    'id' => $id);
 373         if ($value) {
 374                 $attrs['value'] = htmlspecialchars($value);
 375         }
 376         common_element('input', $attrs);
 377         if ($instructions) {
 378                 common_element('span', 'input_instructions', $instructions);
 379         }
 380         common_element_end('p');
 381 }
 382
 383 function common_checkbox($id, $label, $checked=false, $instructions=NULL, $value='true', $disabled=false)
 384 {
 385         common_element_start('p');
 386         $attrs = array('name' => $id,
 387                                    'type' => 'checkbox',
 388                                    'class' => 'checkbox',
 389                                    'id' => $id);
 390         if ($value) {
 391                 $attrs['value'] = htmlspecialchars($value);
 392         }
 393         if ($checked) {
 394                 $attrs['checked'] = 'checked';
 395         }
 396         if ($disabled) {
 397                 $attrs['disabled'] = 'true';
 398         }
 399         common_element('input', $attrs);
 400         # XXX: use a <label>
 401         common_text(' ');
 402         common_element('span', 'checkbox_label', $label);
 403         common_text(' ');
 404         if ($instructions) {
 405                 common_element('span', 'input_instructions', $instructions);
 406         }
 407         common_element_end('p');
 408 }
 409
 410 function common_dropdown($id, $label, $content, $instructions=NULL, $blank_select=FALSE, $selected=NULL) {
 411         common_element_start('p');
 412         common_element('label', array('for' => $id), $label);
 413         common_element_start('select', array('id' => $id, 'name' => $id));
 414         if ($blank_select) {
 415                 common_element('option', array('value' => ''));
 416         }
 417         foreach ($content as $value => $option) {
 418                 if ($value == $selected) {
 419                         common_element('option', array('value' => $value, 'selected' => $value), $option);
 420                 } else {
 421                         common_element('option', array('value' => $value), $option);
 422                 }
 423         }
 424         common_element_end('select');
 425         if ($instructions) {
 426                 common_element('span', 'input_instructions', $instructions);
 427         }
 428         common_element_end('p');
 429 }
 430 function common_hidden($id, $value) {
 431         common_element('input', array('name' => $id,
 432                                                                   'type' => 'hidden',
 433                                                                   'id' => $id,
 434                                                                   'value' => $value));
 435 }
 436
 437 function common_password($id, $label, $instructions=NULL) {
 438         common_element_start('p');
 439         common_element('label', array('for' => $id), $label);
 440         $attrs = array('name' => $id,
 441                                    'type' => 'password',
 442                                    'class' => 'password',
 443                                    'id' => $id);
 444         common_element('input', $attrs);
 445         if ($instructions) {
 446                 common_element('span', 'input_instructions', $instructions);
 447         }
 448         common_element_end('p');
 449 }
 450
 451 function common_submit($id, $label, $cls='submit') {
 452         global $xw;
 453         common_element_start('p');
 454         common_element('input', array('type' => 'submit',
 455                                                                   'id' => $id,
 456                                                                   'name' => $id,
 457                                                                   'class' => $cls,
 458                                                                   'value' => $label));
 459         common_element_end('p');
 460 }
 461
 462 function common_textarea($id, $label, $content=NULL, $instructions=NULL) {
 463         common_element_start('p');
 464         common_element('label', array('for' => $id), $label);
 465         common_element('textarea', array('rows' => 3,
 466                                                                          'cols' => 40,
 467                                                                          'name' => $id,
 468                                                                          'id' => $id),
 469                                    ($content) ? $content : '');
 470         if ($instructions) {
 471                 common_element('span', 'input_instructions', $instructions);
 472         }
 473         common_element_end('p');
 474 }
 475
 476 function common_timezone() {
 477         if (common_logged_in()) {
 478                 $user = common_current_user();
 479                 if ($user->timezone) {
 480                         return $user->timezone;
 481                 }
 482         }
 483
 484         global $config;
 485         return $config['site']['timezone'];
 486 }
 487
 488 function common_language() {
 489
 490         // If there is a user logged in and they've set a language preference
 491         // then return that one...
 492         if (common_logged_in()) {
 493                 $user = common_current_user();
 494                 $user_language = $user->language;
 495                 if ($user_language)
 496                         return $user_language;
 497         }
 498
 499         // Otherwise, find the best match for the languages requested by the
 500         // user's browser...
 501         $httplang = isset($_SERVER['HTTP_ACCEPT_LANGUAGE']) ? $_SERVER['HTTP_ACCEPT_LANGUAGE'] : NULL;
 502         if (!empty($httplang)) {
 503                 $language = client_prefered_language($httplang);
 504                 if ($language)
 505                         return $language;
 506         }
 507
 508         // Finally, if none of the above worked, use the site's default...
 509         return common_config('site', 'language');
 510 }
 511 # salted, hashed passwords are stored in the DB
 512
 513 function common_munge_password($password, $id) {
 514         return md5($password . $id);
 515 }
 516
 517 # check if a username exists and has matching password
 518 function common_check_user($nickname, $password) {
 519         # NEVER allow blank passwords, even if they match the DB
 520         if (mb_strlen($password) == 0) {
 521                 return false;
 522         }
 523         $user = User::staticGet('nickname', $nickname);
 524         if (is_null($user)) {
 525                 return false;
 526         } else {
 527                 if (0 == strcmp(common_munge_password($password, $user->id),
 528                                                 $user->password)) {
 529                         return $user;
 530                 } else {
 531                         return false;
 532                 }
 533         }
 534 }
 535
 536 # is the current user logged in?
 537 function common_logged_in() {
 538         return (!is_null(common_current_user()));
 539 }
 540
 541 function common_have_session() {
 542         return (0 != strcmp(session_id(), ''));
 543 }
 544
 545 function common_ensure_session() {
 546         if (!common_have_session()) {
 547                 @session_start();
 548         }
 549 }
 550
 551 # Three kinds of arguments:
 552 # 1) a user object
 553 # 2) a nickname
 554 # 3) NULL to clear
 555
 556 function common_set_user($user) {
 557         if (is_null($user) && common_have_session()) {
 558                 unset($_SESSION['userid']);
 559                 return true;
 560         } else if (is_string($user)) {
 561                 $nickname = $user;
 562                 $user = User::staticGet('nickname', $nickname);
 563         } else if (!($user instanceof User)) {
 564                 return false;
 565         }
 566
 567         if ($user) {
 568                 common_ensure_session();
 569                 $_SESSION['userid'] = $user->id;
 570                 return $user;
 571         }
 572         return false;
 573 }
 574
 575 function common_set_cookie($key, $value, $expiration=0) {
 576         $path = common_config('site', 'path');
 577         $server = common_config('site', 'server');
 578
 579         if ($path && ($path != '/')) {
 580                 $cookiepath = '/' . $path . '/';
 581         } else {
 582                 $cookiepath = '/';
 583         }
 584         return setcookie($key,
 585                          $value,
 586                                  $expiration,
 587                                          $cookiepath,
 588                                      $server);
 589 }
 590
 591 define('REMEMBERME', 'rememberme');
 592 define('REMEMBERME_EXPIRY', 30 * 24 * 60 * 60);
 593
 594 function common_rememberme($user=NULL) {
 595         if (!$user) {
 596                 $user = common_current_user();
 597                 if (!$user) {
 598                         common_debug('No current user to remember', __FILE__);
 599                         return false;
 600                 }
 601         }
 602         $rm = new Remember_me();
 603         $rm->code = common_good_rand(16);
 604         $rm->user_id = $user->id;
 605         $result = $rm->insert();
 606         if (!$result) {
 607                 common_log_db_error($rm, 'INSERT', __FILE__);
 608                 common_debug('Error adding rememberme record for ' . $user->nickname, __FILE__);
 609                 return false;
 610         }
 611         common_log(LOG_INFO, 'adding rememberme cookie for ' . $user->nickname);
 612         common_set_cookie(REMEMBERME,
 613                                           implode(':', array($rm->user_id, $rm->code)),
 614                                           time() + REMEMBERME_EXPIRY);
 615         return true;
 616 }
 617
 618 function common_remembered_user() {
 619         $user = NULL;
 620         # Try to remember
 621         $packed = isset($_COOKIE[REMEMBERME]) ? $_COOKIE[REMEMBERME] : '';
 622         if ($packed) {
 623                 list($id, $code) = explode(':', $packed);
 624                 if ($id && $code) {
 625                         $rm = Remember_me::staticGet($code);
 626                         if ($rm && ($rm->user_id == $id)) {
 627                                 $user = User::staticGet($rm->user_id);
 628                                 if ($user) {
 629                                         # successful!
 630                                         $result = $rm->delete();
 631                                         if (!$result) {
 632                                                 common_log_db_error($rm, 'DELETE', __FILE__);
 633                                                 $user = NULL;
 634                                         } else {
 635                                                 common_log(LOG_INFO, 'logging in ' . $user->nickname . ' using rememberme code ' . $rm->code);
 636                                                 common_set_user($user->nickname);
 637                                                 common_real_login(false);
 638                                                 # We issue a new cookie, so they can log in
 639                                                 # automatically again after this session
 640                                                 common_rememberme($user);
 641                                         }
 642                                 }
 643                         }
 644                 }
 645         }
 646         return $user;
 647 }
 648
 649 # must be called with a valid user!
 650
 651 function common_forgetme() {
 652         common_set_cookie(REMEMBERME, '', 0);
 653 }
 654
 655 # who is the current user?
 656 function common_current_user() {
 657         if (isset($_REQUEST[session_name()]) || (isset($_SESSION['userid']) && $_SESSION['userid'])) {
 658                 common_ensure_session();
 659                 $id = isset($_SESSION['userid']) ? $_SESSION['userid'] : false;
 660                 if ($id) {
 661                         # note: this should cache
 662                         $user = User::staticGet($id);
 663                         return $user;
 664                 }
 665         }
 666         # that didn't work; try to remember
 667         $user = common_remembered_user();
 668         if ($user) {
 669                 common_debug("Got User " . $user->nickname);
 670             common_debug("Faking session on remembered user");
 671             $_SESSION['userid'] = $user->id;
 672         }
 673         return $user;
 674 }
 675
 676 # Logins that are 'remembered' aren't 'real' -- they're subject to
 677 # cookie-stealing. So, we don't let them do certain things. New reg,
 678 # OpenID, and password logins _are_ real.
 679
 680 function common_real_login($real=true) {
 681         common_ensure_session();
 682         $_SESSION['real_login'] = $real;
 683 }
 684
 685 function common_is_real_login() {
 686         return common_logged_in() && $_SESSION['real_login'];
 687 }
 688
 689 # get canonical version of nickname for comparison
 690 function common_canonical_nickname($nickname) {
 691         # XXX: UTF-8 canonicalization (like combining chars)
 692         return strtolower($nickname);
 693 }
 694
 695 # get canonical version of email for comparison
 696 function common_canonical_email($email) {
 697         # XXX: canonicalize UTF-8
 698         # XXX: lcase the domain part
 699         return $email;
 700 }
 701
 702 define('URL_REGEX', '^|[ \t\r\n])((ftp|http|https|gopher|mailto|news|nntp|telnet|wais|file|prospero|aim|webcal):(([A-Za-z0-9$_.+!*(),;/?:@&~=-])|%[A-Fa-f0-9]{2}){2,}(#([a-zA-Z0-9][a-zA-Z0-9$_.+!*(),;/?:@&~=%-]*))?([A-Za-z0-9$_+!*();/?:~-]))');
 703
 704 function common_render_content($text, $notice) {
 705         $r = common_render_text($text);
 706         $id = $notice->profile_id;
 707         $r = preg_replace('/(^|\s+)@([A-Za-z0-9]{1,64})/e', "'\\1@'.common_at_link($id, '\\2')", $r);
 708         $r = preg_replace('/^T ([A-Z0-9]{1,64}) /e', "'T '.common_at_link($id, '\\1').' '", $r);
 709         return $r;
 710 }
 711
 712 function common_render_text($text) {
 713         $r = htmlspecialchars($text);
 714
 715         $r = preg_replace('/[\x{0}-\x{8}\x{b}-\x{c}\x{e}-\x{19}]/', '', $r);
 716         $r = preg_replace_callback('@https?://[^\]>\s]+@', 'common_render_uri_thingy', $r);
 717         $r = preg_replace('/(^|\s+)#([A-Za-z0-9_\-\.]{1,64})/e', "'\\1#'.common_tag_link('\\2')", $r);
 718         # XXX: machine tags
 719         return $r;
 720 }
 721
 722 function common_render_uri_thingy($matches) {
 723         $uri = $matches[0];
 724         $trailer = '';
 725
 726         # Some heuristics for extracting URIs from surrounding punctuation
 727         # Strip from trailing text...
 728         if (preg_match('/^(.*)([,.:"\']+)$/', $uri, $matches)) {
 729                 $uri = $matches[1];
 730                 $trailer = $matches[2];
 731         }
 732
 733         $pairs = array(
 734                 ']' => '[', # technically disallowed in URIs, but used in Java docs
 735                 ')' => '(', # far too frequent in Wikipedia and MSDN
 736         );
 737         $final = substr($uri, -1, 1);
 738         if (isset($pairs[$final])) {
 739                 $openers = substr_count($uri, $pairs[$final]);
 740                 $closers = substr_count($uri, $final);
 741                 if ($closers > $openers) {
 742                         // Assume the paren was opened outside the URI
 743                         $uri = substr($uri, 0, -1);
 744                         $trailer = $final . $trailer;
 745                 }
 746         }
 747         if ($longurl = common_longurl($uri)) {
 748                 $longurl = htmlentities($longurl, ENT_QUOTES, 'UTF-8');
 749                 $title = " title='$longurl'";
 750         }
 751         else $title = '';
 752
 753         return '<a href="' . $uri . '"' . $title . ' class="extlink">' . $uri . '</a>' . $trailer;
 754 }
 755
 756 function common_longurl($uri)  {
 757         $uri_e = urlencode($uri);
 758         $longurl = unserialize(file_get_contents("http://api.longurl.org/v1/expand?format=php&url=$uri_e"));
 759         if (empty($longurl['long_url']) || $uri === $longurl['long_url']) return false;
 760         return stripslashes($longurl['long_url']);
 761 }
 762
 763 function common_shorten_links($text) {
 764     // \s = not a horizontal whitespace character (since PHP 5.2.4)
 765         // RYM this should prevent * preceded URLs from being processed but it its a char
 766 //      $r = preg_replace('@[^*](https?://[^)\]>\s]+)@e', "common_shorten_link('\\1')", $r);
 767         return preg_replace('@https?://[^)\]>\s]+@e', "common_shorten_link('\\0')", $text);
 768 }
 769
 770 function common_shorten_link($long_url) {
 771
 772         $user = common_current_user();
 773
 774         $curlh = curl_init();
 775         curl_setopt($curlh, CURLOPT_CONNECTTIMEOUT, 20); // # seconds to wait
 776         curl_setopt($curlh, CURLOPT_USERAGENT, 'Laconica');
 777         curl_setopt($curlh, CURLOPT_RETURNTRANSFER, true);
 778
 779         switch($user->urlshorteningservice) {
 780         case 'ur1.ca':
 781             $short_url_service = new LilUrl;
 782             $short_url = $short_url_service->shorten($long_url);
 783             break;
 784
 785         case '2tu.us':
 786             $short_url_service = new TightUrl;
 787             $short_url = $short_url_service->shorten($long_url);
 788             break;
 789
 790         case 'ptiturl.com':
 791             $short_url_service = new PtitUrl;
 792             $short_url = $short_url_service->shorten($long_url);
 793             break;
 794
 795         case 'bit.ly':
 796                         curl_setopt($curlh, CURLOPT_URL, 'http://bit.ly/api?method=shorten&long_url='.urlencode($long_url));
 797                         $short_url = current(json_decode(curl_exec($curlh))->results)->hashUrl;
 798             break;
 799
 800                 case 'is.gd':
 801                         curl_setopt($curlh, CURLOPT_URL, 'http://is.gd/api.php?longurl='.urlencode($long_url));
 802                         $short_url = curl_exec($curlh);
 803                         break;
 804                 case 'snipr.com':
 805                         curl_setopt($curlh, CURLOPT_URL, 'http://snipr.com/site/snip?r=simple&link='.urlencode($long_url));
 806                         $short_url = curl_exec($curlh);
 807                         break;
 808                 case 'metamark.net':
 809                         curl_setopt($curlh, CURLOPT_URL, 'http://metamark.net/api/rest/simple?long_url='.urlencode($long_url));
 810                         $short_url = curl_exec($curlh);
 811                         break;
 812                 case 'tinyurl.com':
 813                         curl_setopt($curlh, CURLOPT_URL, 'http://tinyurl.com/api-create.php?url='.urlencode($long_url));
 814                         $short_url = curl_exec($curlh);
 815                         break;
 816                 default:
 817                         $short_url = false;
 818         }
 819
 820         curl_close($curlh);
 821
 822         if ($short_url) {
 823                 return $short_url;
 824         }
 825         return $long_url;
 826 }
 827
 828 function common_xml_safe_str($str) {
 829         $xmlStr = htmlentities(iconv('UTF-8', 'UTF-8//IGNORE', $str), ENT_NOQUOTES, 'UTF-8');
 830
 831         // Replace control, formatting, and surrogate characters with '*', ala Twitter
 832         return preg_replace('/[\p{Cc}\p{Cf}\p{Cs}]/u', '*', $str);
 833 }
 834
 835 function common_tag_link($tag) {
 836         $canonical = common_canonical_tag($tag);
 837         $url = common_local_url('tag', array('tag' => $canonical));
 838         return '<a href="' . htmlspecialchars($url) . '" rel="tag" class="hashlink">' . htmlspecialchars($tag) . '</a>';
 839 }
 840
 841 function common_canonical_tag($tag) {
 842         return strtolower(str_replace(array('-', '_', '.'), '', $tag));
 843 }
 844
 845 function common_at_link($sender_id, $nickname) {
 846         $sender = Profile::staticGet($sender_id);
 847         $recipient = common_relative_profile($sender, common_canonical_nickname($nickname));
 848         if ($recipient) {
 849                 return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink">'.$nickname.'</a>';
 850         } else {
 851                 return $nickname;
 852         }
 853 }
 854
 855 function common_relative_profile($sender, $nickname, $dt=NULL) {
 856         # Try to find profiles this profile is subscribed to that have this nickname
 857         $recipient = new Profile();
 858         # XXX: use a join instead of a subquery
 859         $recipient->whereAdd('EXISTS (SELECT subscribed from subscription where subscriber = '.$sender->id.' and subscribed = id)', 'AND');
 860         $recipient->whereAdd('nickname = "' . trim($nickname) . '"', 'AND');
 861         if ($recipient->find(TRUE)) {
 862                 # XXX: should probably differentiate between profiles with
 863                 # the same name by date of most recent update
 864                 return $recipient;
 865         }
 866         # Try to find profiles that listen to this profile and that have this nickname
 867         $recipient = new Profile();
 868         # XXX: use a join instead of a subquery
 869         $recipient->whereAdd('EXISTS (SELECT subscriber from subscription where subscribed = '.$sender->id.' and subscriber = id)', 'AND');
 870         $recipient->whereAdd('nickname = "' . trim($nickname) . '"', 'AND');
 871         if ($recipient->find(TRUE)) {
 872                 # XXX: should probably differentiate between profiles with
 873                 # the same name by date of most recent update
 874                 return $recipient;
 875         }
 876         # If this is a local user, try to find a local user with that nickname.
 877         $sender = User::staticGet($sender->id);
 878         if ($sender) {
 879                 $recipient_user = User::staticGet('nickname', $nickname);
 880                 if ($recipient_user) {
 881                         return $recipient_user->getProfile();
 882                 }
 883         }
 884         # Otherwise, no links. @messages from local users to remote users,
 885         # or from remote users to other remote users, are just
 886         # outside our ability to make intelligent guesses about
 887         return NULL;
 888 }
 889
 890 // where should the avatar go for this user?
 891
 892 function common_avatar_filename($id, $extension, $size=NULL, $extra=NULL) {
 893         global $config;
 894
 895         if ($size) {
 896                 return $id . '-' . $size . (($extra) ? ('-' . $extra) : '') . $extension;
 897         } else {
 898                 return $id . '-original' . (($extra) ? ('-' . $extra) : '') . $extension;
 899         }
 900 }
 901
 902 function common_avatar_path($filename) {
 903         global $config;
 904         return INSTALLDIR . '/avatar/' . $filename;
 905 }
 906
 907 function common_avatar_url($filename) {
 908         return common_path('avatar/'.$filename);
 909 }
 910
 911 function common_avatar_display_url($avatar) {
 912         $server = common_config('avatar', 'server');
 913         if ($server) {
 914                 return 'http://'.$server.'/'.$avatar->filename;
 915         } else {
 916                 return $avatar->url;
 917         }
 918 }
 919
 920 function common_default_avatar($size) {
 921         static $sizenames = array(AVATAR_PROFILE_SIZE => 'profile',
 922                                                           AVATAR_STREAM_SIZE => 'stream',
 923                                                           AVATAR_MINI_SIZE => 'mini');
 924         return theme_path('default-avatar-'.$sizenames[$size].'.png');
 925 }
 926
 927 function common_local_url($action, $args=NULL, $fragment=NULL) {
 928         $url = NULL;
 929         if (common_config('site','fancy')) {
 930                 $url = common_fancy_url($action, $args);
 931         } else {
 932                 $url = common_simple_url($action, $args);
 933         }
 934         if (!is_null($fragment)) {
 935                 $url .= '#'.$fragment;
 936         }
 937         return $url;
 938 }
 939
 940 function common_fancy_url($action, $args=NULL) {
 941         switch (strtolower($action)) {
 942          case 'public':
 943                 if ($args && isset($args['page'])) {
 944                         return common_path('?page=' . $args['page']);
 945                 } else {
 946                         return common_path('');
 947                 }
 948          case 'publicrss':
 949                 return common_path('rss');
 950          case 'publicxrds':
 951                 return common_path('xrds');
 952          case 'opensearch':
 953                 if ($args && $args['type']) {
 954                         return common_path('opensearch/'.$args['type']);
 955                 } else {
 956                         return common_path('opensearch/people');
 957                 }
 958          case 'doc':
 959                 return common_path('doc/'.$args['title']);
 960          case 'login':
 961          case 'logout':
 962          case 'subscribe':
 963          case 'unsubscribe':
 964          case 'invite':
 965                 return common_path('main/'.$action);
 966          case 'register':
 967                 if ($args && $args['code']) {
 968                         return common_path('main/register/'.$args['code']);
 969                 } else {
 970                         return common_path('main/register');
 971                 }
 972          case 'remotesubscribe':
 973                 if ($args && $args['nickname']) {
 974                         return common_path('main/remote?nickname=' . $args['nickname']);
 975                 } else {
 976                         return common_path('main/remote');
 977                 }
 978          case 'openidlogin':
 979                 return common_path('main/openid');
 980          case 'profilesettings':
 981                 return common_path('settings/profile');
 982          case 'emailsettings':
 983                 return common_path('settings/email');
 984          case 'openidsettings':
 985                 return common_path('settings/openid');
 986          case 'smssettings':
 987                 return common_path('settings/sms');
 988          case 'twittersettings':
 989                 return common_path('settings/twitter');
 990          case 'othersettings':
 991                 return common_path('settings/other');
 992          case 'newnotice':
 993                 if ($args && $args['replyto']) {
 994                         return common_path('notice/new?replyto='.$args['replyto']);
 995                 } else {
 996                         return common_path('notice/new');
 997                 }
 998          case 'shownotice':
 999                 return common_path('notice/'.$args['notice']);
1000          case 'deletenotice':
1001                 if ($args && $args['notice']) {
1002                         return common_path('notice/delete/'.$args['notice']);
1003                 } else {
1004                         return common_path('notice/delete');
1005                 }
1006          case 'xrds':
1007          case 'foaf':
1008                 return common_path($args['nickname'].'/'.$action);
1009          case 'subscriptions':
1010          case 'subscribers':
1011          case 'all':
1012          case 'replies':
1013          case 'inbox':
1014          case 'outbox':
1015                 if ($args && isset($args['page'])) {
1016                         return common_path($args['nickname'].'/'.$action.'?page=' . $args['page']);
1017                 } else {
1018                         return common_path($args['nickname'].'/'.$action);
1019                 }
1020          case 'allrss':
1021                 return common_path($args['nickname'].'/all/rss');
1022          case 'repliesrss':
1023                 return common_path($args['nickname'].'/replies/rss');
1024          case 'userrss':
1025                 return common_path($args['nickname'].'/rss');
1026          case 'showstream':
1027                 if ($args && isset($args['page'])) {
1028                         return common_path($args['nickname'].'?page=' . $args['page']);
1029                 } else {
1030                         return common_path($args['nickname']);
1031                 }
1032
1033          case 'usertimeline':
1034                 return common_path("api/statuses/user_timeline/".$args['nickname'].".atom");
1035          case 'confirmaddress':
1036                 return common_path('main/confirmaddress/'.$args['code']);
1037          case 'userbyid':
1038                 return common_path('user/'.$args['id']);
1039          case 'recoverpassword':
1040             $path = 'main/recoverpassword';
1041             if ($args['code']) {
1042                 $path .= '/' . $args['code'];
1043                 }
1044             return common_path($path);
1045          case 'imsettings':
1046                 return common_path('settings/im');
1047          case 'peoplesearch':
1048                 return common_path('search/people' . (($args) ? ('?' . http_build_query($args)) : ''));
1049          case 'noticesearch':
1050                 return common_path('search/notice' . (($args) ? ('?' . http_build_query($args)) : ''));
1051          case 'noticesearchrss':
1052                 return common_path('search/notice/rss' . (($args) ? ('?' . http_build_query($args)) : ''));
1053          case 'avatarbynickname':
1054                 return common_path($args['nickname'].'/avatar/'.$args['size']);
1055          case 'tag':
1056             if (isset($args['tag']) && $args['tag']) {
1057                         $path = 'tag/' . $args['tag'];
1058                         unset($args['tag']);
1059                 } else {
1060                         $path = 'tags';
1061                 }
1062                 return common_path($path . (($args) ? ('?' . http_build_query($args)) : ''));
1063          case 'tags':
1064                 return common_path('tags' . (($args) ? ('?' . http_build_query($args)) : ''));
1065          case 'favor':
1066                 return common_path('main/favor');
1067          case 'disfavor':
1068                 return common_path('main/disfavor');
1069          case 'showfavorites':
1070                 if ($args && isset($args['page'])) {
1071                         return common_path($args['nickname'].'/favorites?page=' . $args['page']);
1072                 } else {
1073                         return common_path($args['nickname'].'/favorites');
1074                 }
1075          case 'favoritesrss':
1076                 return common_path($args['nickname'].'/favorites/rss');
1077          case 'showmessage':
1078                 return common_path('message/' . $args['message']);
1079          case 'newmessage':
1080                 return common_path('message/new' . (($args) ? ('?' . http_build_query($args)) : ''));
1081          case 'api':
1082                 # XXX: do fancy URLs for all the API methods
1083                 switch (strtolower($args['apiaction'])) {
1084                  case 'statuses':
1085                         switch (strtolower($args['method'])) {
1086                          case 'user_timeline.rss':
1087                                 return common_path('api/statuses/user_timeline/'.$args['argument'].'.rss');
1088                          case 'user_timeline.atom':
1089                                 return common_path('api/statuses/user_timeline/'.$args['argument'].'.rss');
1090                          case 'user_timeline.rss':
1091                                 return common_path('api/statuses/user_timeline/'.$args['argument'].'.rss');
1092                          case 'user_timeline.atom':
1093                                 return common_path('api/statuses/user_timeline/'.$args['argument'].'.rss');
1094                          default: return common_simple_url($action, $args);
1095                         }
1096                  default: return common_simple_url($action, $args);
1097                 }
1098          case 'sup':
1099                 if ($args && isset($args['seconds'])) {
1100                         return common_path('main/sup?seconds='.$args['seconds']);
1101                 } else {
1102                         return common_path('main/sup');
1103                 }
1104          default:
1105                 return common_simple_url($action, $args);
1106         }
1107 }
1108
1109 function common_simple_url($action, $args=NULL) {
1110         global $config;
1111         /* XXX: pretty URLs */
1112         $extra = '';
1113         if ($args) {
1114                 foreach ($args as $key => $value) {
1115                         $extra .= "&${key}=${value}";
1116                 }
1117         }
1118         return common_path("index.php?action=${action}${extra}");
1119 }
1120
1121 function common_path($relative) {
1122         global $config;
1123         $pathpart = ($config['site']['path']) ? $config['site']['path']."/" : '';
1124         return "http://".$config['site']['server'].'/'.$pathpart.$relative;
1125 }
1126
1127 function common_date_string($dt) {
1128         // XXX: do some sexy date formatting
1129         // return date(DATE_RFC822, $dt);
1130         $t = strtotime($dt);
1131         $now = time();
1132         $diff = $now - $t;
1133
1134         if ($now < $t) { # that shouldn't happen!
1135                 return common_exact_date($dt);
1136         } else if ($diff < 60) {
1137                 return _('a few seconds ago');
1138         } else if ($diff < 92) {
1139                 return _('about a minute ago');
1140         } else if ($diff < 3300) {
1141                 return sprintf(_('about %d minutes ago'), round($diff/60));
1142         } else if ($diff < 5400) {
1143                 return _('about an hour ago');
1144         } else if ($diff < 22 * 3600) {
1145                 return sprintf(_('about %d hours ago'), round($diff/3600));
1146         } else if ($diff < 37 * 3600) {
1147                 return _('about a day ago');
1148         } else if ($diff < 24 * 24 * 3600) {
1149                 return sprintf(_('about %d days ago'), round($diff/(24*3600)));
1150         } else if ($diff < 46 * 24 * 3600) {
1151                 return _('about a month ago');
1152         } else if ($diff < 330 * 24 * 3600) {
1153                 return sprintf(_('about %d months ago'), round($diff/(30*24*3600)));
1154         } else if ($diff < 480 * 24 * 3600) {
1155                 return _('about a year ago');
1156         } else {
1157                 return common_exact_date($dt);
1158         }
1159 }
1160
1161 function common_exact_date($dt) {
1162     static $_utc;
1163     static $_siteTz;
1164
1165     if (!$_utc) {
1166         $_utc = new DateTimeZone('UTC');
1167         $_siteTz = new DateTimeZone(common_timezone());
1168     }
1169
1170         $dateStr = date('d F Y H:i:s', strtotime($dt));
1171         $d = new DateTime($dateStr, $_utc);
1172         $d->setTimezone($_siteTz);
1173         return $d->format(DATE_RFC850);
1174 }
1175
1176 function common_date_w3dtf($dt) {
1177         $dateStr = date('d F Y H:i:s', strtotime($dt));
1178         $d = new DateTime($dateStr, new DateTimeZone('UTC'));
1179         $d->setTimezone(new DateTimeZone(common_timezone()));
1180         return $d->format(DATE_W3C);
1181 }
1182
1183 function common_date_rfc2822($dt) {
1184         $dateStr = date('d F Y H:i:s', strtotime($dt));
1185         $d = new DateTime($dateStr, new DateTimeZone('UTC'));
1186         $d->setTimezone(new DateTimeZone(common_timezone()));
1187         return $d->format('r');
1188 }
1189
1190 function common_date_iso8601($dt) {
1191         $dateStr = date('d F Y H:i:s', strtotime($dt));
1192         $d = new DateTime($dateStr, new DateTimeZone('UTC'));
1193         $d->setTimezone(new DateTimeZone(common_timezone()));
1194         return $d->format('c');
1195 }
1196
1197 function common_sql_now() {
1198         return strftime('%Y-%m-%d %H:%M:%S', time());
1199 }
1200
1201 function common_redirect($url, $code=307) {
1202         static $status = array(301 => "Moved Permanently",
1203                                                    302 => "Found",
1204                                                    303 => "See Other",
1205                                                    307 => "Temporary Redirect");
1206         header("Status: ${code} $status[$code]");
1207         header("Location: $url");
1208
1209         common_start_xml('a',
1210                                          '-//W3C//DTD XHTML 1.0 Strict//EN',
1211                                          'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd');
1212         common_element('a', array('href' => $url), $url);
1213         common_end_xml();
1214     exit;
1215 }
1216
1217 function common_save_replies($notice) {
1218         # Alternative reply format
1219         $tname = false;
1220         if (preg_match('/^T ([A-Z0-9]{1,64}) /', $notice->content, $match)) {
1221                 $tname = $match[1];
1222         }
1223         # extract all @messages
1224         $cnt = preg_match_all('/(?:^|\s)@([a-z0-9]{1,64})/', $notice->content, $match);
1225         if (!$cnt && !$tname) {
1226                 return true;
1227         }
1228         # XXX: is there another way to make an array copy?
1229         $names = ($tname) ? array_unique(array_merge(array(strtolower($tname)), $match[1])) : array_unique($match[1]);
1230         $sender = Profile::staticGet($notice->profile_id);
1231         # store replied only for first @ (what user/notice what the reply directed,
1232         # we assume first @ is it)
1233         for ($i=0; $i<count($names); $i++) {
1234                 $nickname = $names[$i];
1235                 $recipient = common_relative_profile($sender, $nickname, $notice->created);
1236                 if (!$recipient) {
1237                         continue;
1238                 }
1239                 if ($i == 0 && ($recipient->id != $sender->id) && !$notice->reply_to) { # Don't save reply to self
1240                         $reply_for = $recipient;
1241                         $recipient_notice = $reply_for->getCurrentNotice();
1242                         if ($recipient_notice) {
1243                                 $orig = clone($notice);
1244                                 $notice->reply_to = $recipient_notice->id;
1245                                 $notice->update($orig);
1246                         }
1247                 }
1248                 $reply = new Reply();
1249                 $reply->notice_id = $notice->id;
1250                 $reply->profile_id = $recipient->id;
1251                 $id = $reply->insert();
1252                 if (!$id) {
1253                         $last_error = &PEAR::getStaticProperty('DB_DataObject','lastError');
1254                         common_log(LOG_ERR, 'DB error inserting reply: ' . $last_error->message);
1255                         common_server_error(sprintf(_('DB error inserting reply: %s'), $last_error->message));
1256                         return;
1257                 }
1258         }
1259 }
1260
1261 function common_broadcast_notice($notice, $remote=false) {
1262
1263         // Check to see if notice should go to Twitter
1264         $flink = Foreign_link::getForeignLink($notice->profile_id, 1); // 1 == Twitter
1265         if (($flink->noticesync & FOREIGN_NOTICE_SEND) == FOREIGN_NOTICE_SEND) {
1266
1267                 // If it's not a Twitter-style reply, or if the user WANTS to send replies...
1268
1269                 if (!preg_match('/^@[a-zA-Z0-9_]{1,15}\b/u', $notice->content) ||
1270                         (($flink->noticesync & FOREIGN_NOTICE_SEND_REPLY) == FOREIGN_NOTICE_SEND_REPLY)) {
1271
1272                         $result = common_twitter_broadcast($notice, $flink);
1273
1274                         if (!$result) {
1275                                 common_debug('Unable to send notice: ' . $notice->id . ' to Twitter.', __FILE__);
1276                         }
1277                 }
1278         }
1279
1280         if (common_config('queue', 'enabled')) {
1281                 # Do it later!
1282                 return common_enqueue_notice($notice);
1283         } else {
1284                 return common_real_broadcast($notice, $remote);
1285         }
1286 }
1287
1288 function common_twitter_broadcast($notice, $flink) {
1289         global $config;
1290         $success = true;
1291         $fuser = $flink->getForeignUser();
1292         $twitter_user = $fuser->nickname;
1293         $twitter_password = $flink->credentials;
1294         $uri = 'http://www.twitter.com/statuses/update.json';
1295
1296         // XXX: Hack to get around PHP cURL's use of @ being a a meta character
1297         $statustxt = preg_replace('/^@/', ' @', $notice->content);
1298
1299         $options = array(
1300                 CURLOPT_USERPWD                 => "$twitter_user:$twitter_password",
1301                 CURLOPT_POST                    => true,
1302                 CURLOPT_POSTFIELDS              => array(
1303                                                                         'status'        => $statustxt,
1304                                                                         'source'        => $config['integration']['source']
1305                                                                         ),
1306                 CURLOPT_RETURNTRANSFER  => true,
1307                 CURLOPT_FAILONERROR             => true,
1308                 CURLOPT_HEADER                  => false,
1309                 CURLOPT_FOLLOWLOCATION  => true,
1310                 CURLOPT_USERAGENT               => "Laconica",
1311                 CURLOPT_CONNECTTIMEOUT  => 120,  // XXX: Scary!!!! How long should this be?
1312                 CURLOPT_TIMEOUT                 => 120
1313         );
1314
1315         $ch = curl_init($uri);
1316     curl_setopt_array($ch, $options);
1317     $data = curl_exec($ch);
1318     $errmsg = curl_error($ch);
1319
1320         if ($errmsg) {
1321                 common_debug("cURL error: $errmsg - trying to send notice for $twitter_user.",
1322                         __FILE__);
1323                 $success = false;
1324         }
1325
1326         curl_close($ch);
1327
1328         if (!$data) {
1329                 common_debug("No data returned by Twitter's API trying to send update for $twitter_user",
1330                         __FILE__);
1331                 $success = false;
1332         }
1333
1334         // Twitter should return a status
1335         $status = json_decode($data);
1336
1337         if (!$status->id) {
1338                 common_debug("Unexpected data returned by Twitter API trying to send update for $twitter_user",
1339                         __FILE__);
1340                 $success = false;
1341         }
1342
1343         return $success;
1344 }
1345
1346 # Stick the notice on the queue
1347
1348 function common_enqueue_notice($notice) {
1349         foreach (array('jabber', 'omb', 'sms', 'public') as $transport) {
1350                 $qi = new Queue_item();
1351                 $qi->notice_id = $notice->id;
1352                 $qi->transport = $transport;
1353                 $qi->created = $notice->created;
1354         $result = $qi->insert();
1355                 if (!$result) {
1356                         $last_error = &PEAR::getStaticProperty('DB_DataObject','lastError');
1357                         common_log(LOG_ERR, 'DB error inserting queue item: ' . $last_error->message);
1358                         return false;
1359                 }
1360                 common_log(LOG_DEBUG, 'complete queueing notice ID = ' . $notice->id . ' for ' . $transport);
1361         }
1362         return $result;
1363 }
1364
1365 function common_dequeue_notice($notice) {
1366         $qi = Queue_item::staticGet($notice->id);
1367         if ($qi) {
1368                 $result = $qi->delete();
1369                 if (!$result) {
1370                     $last_error = &PEAR::getStaticProperty('DB_DataObject','lastError');
1371                     common_log(LOG_ERR, 'DB error deleting queue item: ' . $last_error->message);
1372                     return false;
1373                 }
1374                 common_log(LOG_DEBUG, 'complete dequeueing notice ID = ' . $notice->id);
1375                 return $result;
1376         } else {
1377             return false;
1378         }
1379 }
1380
1381 function common_real_broadcast($notice, $remote=false) {
1382         $success = true;
1383         if (!$remote) {
1384                 # Make sure we have the OMB stuff
1385                 require_once(INSTALLDIR.'/lib/omb.php');
1386                 $success = omb_broadcast_remote_subscribers($notice);
1387                 if (!$success) {
1388                         common_log(LOG_ERR, 'Error in OMB broadcast for notice ' . $notice->id);
1389                 }
1390         }
1391         if ($success) {
1392                 require_once(INSTALLDIR.'/lib/jabber.php');
1393                 $success = jabber_broadcast_notice($notice);
1394                 if (!$success) {
1395                         common_log(LOG_ERR, 'Error in jabber broadcast for notice ' . $notice->id);
1396                 }
1397         }
1398         if ($success) {
1399                 require_once(INSTALLDIR.'/lib/mail.php');
1400                 $success = mail_broadcast_notice_sms($notice);
1401                 if (!$success) {
1402                         common_log(LOG_ERR, 'Error in sms broadcast for notice ' . $notice->id);
1403                 }
1404         }
1405         if ($success) {
1406                 $success = jabber_public_notice($notice);
1407                 if (!$success) {
1408                         common_log(LOG_ERR, 'Error in public broadcast for notice ' . $notice->id);
1409                 }
1410         }
1411         // XXX: broadcast notices to other IM
1412         return $success;
1413 }
1414
1415 function common_broadcast_profile($profile) {
1416         // XXX: optionally use a queue system like http://code.google.com/p/microapps/wiki/NQDQ
1417         require_once(INSTALLDIR.'/lib/omb.php');
1418         omb_broadcast_profile($profile);
1419         // XXX: Other broadcasts...?
1420         return true;
1421 }
1422
1423 function common_profile_url($nickname) {
1424         return common_local_url('showstream', array('nickname' => $nickname));
1425 }
1426
1427 # Don't call if nobody's logged in
1428
1429 function common_notice_form($action=NULL, $content=NULL) {
1430         $user = common_current_user();
1431         assert(!is_null($user));
1432         common_element_start('form', array('id' => 'status_form',
1433                                                                            'method' => 'post',
1434                                                                            'action' => common_local_url('newnotice')));
1435         common_element_start('p');
1436         common_element('label', array('for' => 'status_textarea',
1437                                                                   'id' => 'status_label'),
1438                                    sprintf(_('What\'s up, %s?'), $user->nickname));
1439     common_element('span', array('id' => 'counter', 'class' => 'counter'), '140');
1440         common_element('textarea', array('id' => 'status_textarea',
1441                                                                          'cols' => 60,
1442                                                                          'rows' => 3,
1443                                                                          'name' => 'status_textarea'),
1444                                    ($content) ? $content : '');
1445         common_hidden('token', common_session_token());
1446         if ($action) {
1447                 common_hidden('returnto', $action);
1448         }
1449         # set by JavaScript
1450         common_hidden('inreplyto', 'false');
1451         common_element('input', array('id' => 'status_submit',
1452                                                                   'name' => 'status_submit',
1453                                                                   'type' => 'submit',
1454                                                                   'value' => _('Send')));
1455         common_element_end('p');
1456         common_element_end('form');
1457 }
1458
1459 # Should make up a reasonable root URL
1460
1461 function common_root_url() {
1462         return common_path('');
1463 }
1464
1465 # returns $bytes bytes of random data as a hexadecimal string
1466 # "good" here is a goal and not a guarantee
1467
1468 function common_good_rand($bytes) {
1469         # XXX: use random.org...?
1470         if (file_exists('/dev/urandom')) {
1471                 return common_urandom($bytes);
1472         } else { # FIXME: this is probably not good enough
1473                 return common_mtrand($bytes);
1474         }
1475 }
1476
1477 function common_urandom($bytes) {
1478         $h = fopen('/dev/urandom', 'rb');
1479         # should not block
1480         $src = fread($h, $bytes);
1481         fclose($h);
1482         $enc = '';
1483         for ($i = 0; $i < $bytes; $i++) {
1484                 $enc .= sprintf("%02x", (ord($src[$i])));
1485         }
1486         return $enc;
1487 }
1488
1489 function common_mtrand($bytes) {
1490         $enc = '';
1491         for ($i = 0; $i < $bytes; $i++) {
1492                 $enc .= sprintf("%02x", mt_rand(0, 255));
1493         }
1494         return $enc;
1495 }
1496
1497 function common_set_returnto($url) {
1498         common_ensure_session();
1499         $_SESSION['returnto'] = $url;
1500 }
1501
1502 function common_get_returnto() {
1503         common_ensure_session();
1504         return $_SESSION['returnto'];
1505 }
1506
1507 function common_timestamp() {
1508         return date('YmdHis');
1509 }
1510
1511 function common_ensure_syslog() {
1512         static $initialized = false;
1513         if (!$initialized) {
1514                 global $config;
1515                 openlog($config['syslog']['appname'], 0, LOG_USER);
1516                 $initialized = true;
1517         }
1518 }
1519
1520 function common_log($priority, $msg, $filename=NULL) {
1521         $logfile = common_config('site', 'logfile');
1522         if ($logfile) {
1523                 $log = fopen($logfile, "a");
1524                 if ($log) {
1525                         static $syslog_priorities = array('LOG_EMERG', 'LOG_ALERT', 'LOG_CRIT', 'LOG_ERR',
1526                                                                                           'LOG_WARNING', 'LOG_NOTICE', 'LOG_INFO', 'LOG_DEBUG');
1527                         $output = date('Y-m-d H:i:s') . ' ' . $syslog_priorities[$priority] . ': ' . $msg . "\n";
1528                         fwrite($log, $output);
1529                         fclose($log);
1530                 }
1531         } else {
1532                 common_ensure_syslog();
1533                 syslog($priority, $msg);
1534         }
1535 }
1536
1537 function common_debug($msg, $filename=NULL) {
1538         if ($filename) {
1539                 common_log(LOG_DEBUG, basename($filename).' - '.$msg);
1540         } else {
1541                 common_log(LOG_DEBUG, $msg);
1542         }
1543 }
1544
1545 function common_log_db_error(&$object, $verb, $filename=NULL) {
1546         $objstr = common_log_objstring($object);
1547         $last_error = &PEAR::getStaticProperty('DB_DataObject','lastError');
1548         common_log(LOG_ERR, $last_error->message . '(' . $verb . ' on ' . $objstr . ')', $filename);
1549 }
1550
1551 function common_log_objstring(&$object) {
1552         if (is_null($object)) {
1553                 return "NULL";
1554         }
1555         $arr = $object->toArray();
1556         $fields = array();
1557         foreach ($arr as $k => $v) {
1558                 $fields[] = "$k='$v'";
1559         }
1560         $objstring = $object->tableName() . '[' . implode(',', $fields) . ']';
1561         return $objstring;
1562 }
1563
1564 function common_valid_http_url($url) {
1565         return Validate::uri($url, array('allowed_schemes' => array('http', 'https')));
1566 }
1567
1568 function common_valid_tag($tag) {
1569         if (preg_match('/^tag:(.*?),(\d{4}(-\d{2}(-\d{2})?)?):(.*)$/', $tag, $matches)) {
1570                 return (Validate::email($matches[1]) ||
1571                                 preg_match('/^([\w-\.]+)$/', $matches[1]));
1572         }
1573         return false;
1574 }
1575
1576 # Does a little before-after block for next/prev page
1577
1578 function common_pagination($have_before, $have_after, $page, $action, $args=NULL) {
1579
1580         if ($have_before || $have_after) {
1581                 common_element_start('div', array('id' => 'pagination'));
1582                 common_element_start('ul', array('id' => 'nav_pagination'));
1583         }
1584
1585         if ($have_before) {
1586                 $pargs = array('page' => $page-1);
1587                 $newargs = ($args) ? array_merge($args,$pargs) : $pargs;
1588
1589                 common_element_start('li', 'before');
1590                 common_element('a', array('href' => common_local_url($action, $newargs)),
1591                                            _('« After'));
1592                 common_element_end('li');
1593         }
1594
1595         if ($have_after) {
1596                 $pargs = array('page' => $page+1);
1597                 $newargs = ($args) ? array_merge($args,$pargs) : $pargs;
1598                 common_element_start('li', 'after');
1599                 common_element('a', array('href' => common_local_url($action, $newargs)),
1600                                                    _('Before »'));
1601                 common_element_end('li');
1602         }
1603
1604         if ($have_before || $have_after) {
1605                 common_element_end('ul');
1606                 common_element_end('div');
1607         }
1608 }
1609
1610 /* Following functions are copied from MediaWiki GlobalFunctions.php
1611  * and written by Evan Prodromou. */
1612
1613 function common_accept_to_prefs($accept, $def = '*/*') {
1614         # No arg means accept anything (per HTTP spec)
1615         if(!$accept) {
1616                 return array($def => 1);
1617         }
1618
1619         $prefs = array();
1620
1621         $parts = explode(',', $accept);
1622
1623         foreach($parts as $part) {
1624                 # FIXME: doesn't deal with params like 'text/html; level=1'
1625                 @list($value, $qpart) = explode(';', $part);
1626                 $match = array();
1627                 if(!isset($qpart)) {
1628                         $prefs[$value] = 1;
1629                 } elseif(preg_match('/q\s*=\s*(\d*\.\d+)/', $qpart, $match)) {
1630                         $prefs[$value] = $match[1];
1631                 }
1632         }
1633
1634         return $prefs;
1635 }
1636
1637 function common_mime_type_match($type, $avail) {
1638         if(array_key_exists($type, $avail)) {
1639                 return $type;
1640         } else {
1641                 $parts = explode('/', $type);
1642                 if(array_key_exists($parts[0] . '/*', $avail)) {
1643                         return $parts[0] . '/*';
1644                 } elseif(array_key_exists('*/*', $avail)) {
1645                         return '*/*';
1646                 } else {
1647                         return NULL;
1648                 }
1649         }
1650 }
1651
1652 function common_negotiate_type($cprefs, $sprefs) {
1653         $combine = array();
1654
1655         foreach(array_keys($sprefs) as $type) {
1656                 $parts = explode('/', $type);
1657                 if($parts[1] != '*') {
1658                         $ckey = common_mime_type_match($type, $cprefs);
1659                         if($ckey) {
1660                                 $combine[$type] = $sprefs[$type] * $cprefs[$ckey];
1661                         }
1662                 }
1663         }
1664
1665         foreach(array_keys($cprefs) as $type) {
1666                 $parts = explode('/', $type);
1667                 if($parts[1] != '*' && !array_key_exists($type, $sprefs)) {
1668                         $skey = common_mime_type_match($type, $sprefs);
1669                         if($skey) {
1670                                 $combine[$type] = $sprefs[$skey] * $cprefs[$type];
1671                         }
1672                 }
1673         }
1674
1675         $bestq = 0;
1676         $besttype = "text/html";
1677
1678         foreach(array_keys($combine) as $type) {
1679                 if($combine[$type] > $bestq) {
1680                         $besttype = $type;
1681                         $bestq = $combine[$type];
1682                 }
1683         }
1684
1685         return $besttype;
1686 }
1687
1688 function common_config($main, $sub) {
1689         global $config;
1690         return isset($config[$main][$sub]) ? $config[$main][$sub] : false;
1691 }
1692
1693 function common_copy_args($from) {
1694         $to = array();
1695         $strip = get_magic_quotes_gpc();
1696         foreach ($from as $k => $v) {
1697                 $to[$k] = ($strip) ? stripslashes($v) : $v;
1698         }
1699         return $to;
1700 }
1701
1702 // Neutralise the evil effects of magic_quotes_gpc in the current request.
1703 // This is used before handing a request off to OAuthRequest::from_request.
1704 function common_remove_magic_from_request() {
1705         if(get_magic_quotes_gpc()) {
1706                 $_POST=array_map('stripslashes',$_POST);
1707                 $_GET=array_map('stripslashes',$_GET);
1708         }
1709 }
1710
1711 function common_user_uri(&$user) {
1712         return common_local_url('userbyid', array('id' => $user->id));
1713 }
1714
1715 function common_notice_uri(&$notice) {
1716         return common_local_url('shownotice',
1717                 array('notice' => $notice->id));
1718 }
1719
1720 # 36 alphanums - lookalikes (0, O, 1, I) = 32 chars = 5 bits
1721
1722 function common_confirmation_code($bits) {
1723         # 36 alphanums - lookalikes (0, O, 1, I) = 32 chars = 5 bits
1724         static $codechars = '23456789ABCDEFGHJKLMNPQRSTUVWXYZ';
1725         $chars = ceil($bits/5);
1726         $code = '';
1727         for ($i = 0; $i < $chars; $i++) {
1728                 # XXX: convert to string and back
1729                 $num = hexdec(common_good_rand(1));
1730                 # XXX: randomness is too precious to throw away almost
1731                 # 40% of the bits we get!
1732                 $code .= $codechars[$num%32];
1733         }
1734         return $code;
1735 }
1736
1737 # convert markup to HTML
1738
1739 function common_markup_to_html($c) {
1740         $c = preg_replace('/%%action.(\w+)%%/e', "common_local_url('\\1')", $c);
1741         $c = preg_replace('/%%doc.(\w+)%%/e', "common_local_url('doc', array('title'=>'\\1'))", $c);
1742         $c = preg_replace('/%%(\w+).(\w+)%%/e', 'common_config(\'\\1\', \'\\2\')', $c);
1743         return Markdown($c);
1744 }
1745
1746 function common_profile_avatar_url($profile, $size=AVATAR_PROFILE_SIZE) {
1747         $avatar = $profile->getAvatar($size);
1748         if ($avatar) {
1749                 return common_avatar_display_url($avatar);
1750         } else {
1751                 return common_default_avatar($size);
1752         }
1753 }
1754
1755 function common_profile_uri($profile) {
1756         if (!$profile) {
1757                 return NULL;
1758         }
1759         $user = User::staticGet($profile->id);
1760         if ($user) {
1761                 return $user->uri;
1762         }
1763
1764         $remote = Remote_profile::staticGet($profile->id);
1765         if ($remote) {
1766                 return $remote->uri;
1767         }
1768         # XXX: this is a very bad profile!
1769         return NULL;
1770 }
1771
1772 function common_canonical_sms($sms) {
1773         # strip non-digits
1774         preg_replace('/\D/', '', $sms);
1775         return $sms;
1776 }
1777
1778 function common_error_handler($errno, $errstr, $errfile, $errline, $errcontext) {
1779     switch ($errno) {
1780      case E_USER_ERROR:
1781                 common_log(LOG_ERR, "[$errno] $errstr ($errfile:$errline)");
1782                 exit(1);
1783                 break;
1784
1785          case E_USER_WARNING:
1786                 common_log(LOG_WARNING, "[$errno] $errstr ($errfile:$errline)");
1787                 break;
1788
1789      case E_USER_NOTICE:
1790                 common_log(LOG_NOTICE, "[$errno] $errstr ($errfile:$errline)");
1791                 break;
1792     }
1793
1794         # FIXME: show error page if we're on the Web
1795     /* Don't execute PHP internal error handler */
1796     return true;
1797 }
1798
1799 function common_session_token() {
1800         common_ensure_session();
1801         if (!array_key_exists('token', $_SESSION)) {
1802                 $_SESSION['token'] = common_good_rand(64);
1803         }
1804         return $_SESSION['token'];
1805 }
1806
1807 function common_disfavor_form($notice) {
1808         common_element_start('form', array('id' => 'disfavor-' . $notice->id,
1809                                                                            'method' => 'post',
1810                                                                            'class' => 'disfavor',
1811                                                                            'action' => common_local_url('disfavor')));
1812         common_hidden('token', common_session_token());
1813         common_hidden('notice', $notice->id);
1814         common_element('input', array('type' => 'submit',
1815                                                                   'id' => 'disfavor-submit-' . $notice->id,
1816                                                                   'name' => 'disfavor-submit-' . $notice->id,
1817                                                                   'class' => 'disfavor',
1818                                                                   'value' => '♥'));
1819         common_element_end('form');
1820 }
1821
1822 function common_favor_form($notice) {
1823         common_element_start('form', array('id' => 'favor-' . $notice->id,
1824                                                                            'method' => 'post',
1825                                                                            'class' => 'favor',
1826                                                                            'action' => common_local_url('favor')));
1827         common_hidden('token', common_session_token());
1828         common_hidden('notice', $notice->id);
1829         common_element('input', array('type' => 'submit',
1830                                                                   'id' => 'favor-submit-' . $notice->id,
1831                                                                   'name' => 'favor-submit-' . $notice->id,
1832                                                                   'class' => 'favor',
1833                                                                   'value' => '♡'));
1834         common_element_end('form');
1835 }
1836
1837 function common_cache_key($extra) {
1838         return 'laconica:' . common_keyize(common_config('site', 'name')) . ':' . $extra;
1839 }
1840
1841 function common_keyize($str) {
1842         $str = strtolower($str);
1843         $str = preg_replace('/\s/', '_', $str);
1844         return $str;
1845 }
1846
1847 function common_message_form($content, $user, $to) {
1848
1849         common_element_start('form', array('id' => 'message_form',
1850                                                                            'method' => 'post',
1851                                                                            'action' => common_local_url('newmessage')));
1852
1853         $mutual_users = $user->mutuallySubscribedUsers();
1854
1855         $mutual = array();
1856
1857         while ($mutual_users->fetch()) {
1858                 if ($mutual_users->id != $user->id) {
1859                         $mutual[$mutual_users->id] = $mutual_users->nickname;
1860                 }
1861         }
1862
1863         $mutual_users->free();
1864         unset($mutual_users);
1865
1866         common_dropdown('to', _('To'), $mutual, NULL, FALSE, $to->id);
1867
1868         common_element_start('p');
1869
1870         common_element('textarea', array('id' => 'message_content',
1871                                                                          'cols' => 60,
1872                                                                          'rows' => 3,
1873                                                                          'name' => 'content'),
1874                                    ($content) ? $content : '');
1875
1876         common_element('input', array('id' => 'message_send',
1877                                                                   'name' => 'message_send',
1878                                                                   'type' => 'submit',
1879                                                                   'value' => _('Send')));
1880
1881         common_hidden('token', common_session_token());
1882
1883         common_element_end('p');
1884         common_element_end('form');
1885 }
1886
1887 function common_memcache() {
1888         static $cache = NULL;
1889         if (!common_config('memcached', 'enabled')) {
1890                 return NULL;
1891         } else {
1892                 if (!$cache) {
1893                         $cache = new Memcache();
1894                         $servers = common_config('memcached', 'server');
1895                         if (is_array($servers)) {
1896                                 foreach($servers as $server) {
1897                                         $cache->addServer($server);
1898                                 }
1899                         } else {
1900                                 $cache->addServer($servers);
1901                         }
1902                 }
1903                 return $cache;
1904         }
1905 }