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, $indent=true) {
 118         global $xw;
 119         $xw = new XMLWriter();
 120         $xw->openURI('php://output');
 121         $xw->setIndent($indent);
 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'.$ver.'.css').'?version='.LACONICA_VERSION.'" /><![endif]');
 174                 }
 175         }
 176
 177         common_element('script', array('type' => 'text/javascript',
 178                                                                    'src' => common_path('js/jquery.min.js')),
 179                                    ' ');
 180         common_element('script', array('type' => 'text/javascript',
 181                                                                    'src' => common_path('js/jquery.form.js')),
 182                                    ' ');
 183         common_element('script', array('type' => 'text/javascript',
 184                                                                    'src' => common_path('js/xbImportNode.js')),
 185                                    ' ');
 186         common_element('script', array('type' => 'text/javascript',
 187                                                                    'src' => common_path('js/util.js?version='.LACONICA_VERSION)),
 188                                    ' ');
 189         common_element('link', array('rel' => 'search', 'type' => 'application/opensearchdescription+xml',
 190                                         'href' =>  common_local_url('opensearch', array('type' => 'people')),
 191                                         'title' => common_config('site', 'name').' People Search'));
 192
 193         common_element('link', array('rel' => 'search', 'type' => 'application/opensearchdescription+xml',
 194                                         'href' =>  common_local_url('opensearch', array('type' => 'notice')),
 195                                         'title' => common_config('site', 'name').' Notice Search'));
 196
 197         if ($callable) {
 198                 if ($data) {
 199                         call_user_func($callable, $data);
 200                 } else {
 201                         call_user_func($callable);
 202                 }
 203         }
 204         common_element_end('head');
 205         common_element_start('body');
 206         common_element_start('div', array('id' => 'wrap'));
 207         common_element_start('div', array('id' => 'header'));
 208         common_nav_menu();
 209         if ((isset($config['site']['logo']) && is_string($config['site']['logo']) && (strlen($config['site']['logo']) > 0))
 210                 || file_exists(theme_file('logo.png')))
 211         {
 212                 common_element_start('a', array('href' => common_local_url('public')));
 213                 common_element('img', array('src' => isset($config['site']['logo']) ?
 214                                                                         ($config['site']['logo']) : theme_path('logo.png'),
 215                                                                         'alt' => $config['site']['name'],
 216                                                                         'id' => 'logo'));
 217                 common_element_end('a');
 218         } else {
 219                 common_element_start('p', array('id' => 'branding'));
 220                 common_element('a', array('href' => common_local_url('public')),
 221                                            $config['site']['name']);
 222                 common_element_end('p');
 223         }
 224
 225         common_element('h1', 'pagetitle', $pagetitle);
 226
 227         if ($headercall) {
 228                 if ($data) {
 229                         call_user_func($headercall, $data);
 230                 } else {
 231                         call_user_func($headercall);
 232                 }
 233         }
 234         common_element_end('div');
 235         common_element_start('div', array('id' => 'content'));
 236 }
 237
 238 function common_start_html($type=NULL, $indent=true) {
 239
 240         if (!$type) {
 241                 $httpaccept = isset($_SERVER['HTTP_ACCEPT']) ? $_SERVER['HTTP_ACCEPT'] : NULL;
 242
 243                 # XXX: allow content negotiation for RDF, RSS, or XRDS
 244
 245                 $type = common_negotiate_type(common_accept_to_prefs($httpaccept),
 246                                                                           common_accept_to_prefs(PAGE_TYPE_PREFS));
 247
 248                 if (!$type) {
 249                         common_user_error(_('This page is not available in a media type you accept'), 406);
 250                         exit(0);
 251                 }
 252         }
 253
 254         header('Content-Type: '.$type);
 255
 256         common_start_xml('html',
 257                                          '-//W3C//DTD XHTML 1.0 Strict//EN',
 258                                          'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd', $indent);
 259
 260         # FIXME: correct language for interface
 261
 262         $language = common_language();
 263
 264         common_element_start('html', array('xmlns' => 'http://www.w3.org/1999/xhtml',
 265                                                                            'xml:lang' => $language,
 266                                                                            'lang' => $language));
 267 }
 268
 269 function common_show_footer() {
 270         global $xw, $config;
 271         common_element_end('div'); # content div
 272         common_foot_menu();
 273         common_element_start('div', array('id' => 'footer'));
 274         common_element_start('div', 'laconica');
 275         if (common_config('site', 'broughtby')) {
 276                 $instr = _('**%%site.name%%** is a microblogging service brought to you by [%%site.broughtby%%](%%site.broughtbyurl%%). ');
 277         } else {
 278                 $instr = _('**%%site.name%%** is a microblogging service. ');
 279         }
 280         $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);
 281     $output = common_markup_to_html($instr);
 282     common_raw($output);
 283         common_element_end('div');
 284         common_element('img', array('id' => 'cc',
 285                                                                 'src' => $config['license']['image'],
 286                                                                 'alt' => $config['license']['title']));
 287         common_element_start('p');
 288         common_text(_('Unless otherwise specified, contents of this site are copyright by the contributors and available under the '));
 289         common_element('a', array('class' => 'license',
 290                                                           'rel' => 'license',
 291                                                           'href' => $config['license']['url']),
 292                                    $config['license']['title']);
 293         common_text(_('. Contributors should be attributed by full name or nickname.'));
 294         common_element_end('p');
 295         common_element_end('div');
 296         common_element_end('div');
 297         common_element_end('body');
 298         common_element_end('html');
 299         common_end_xml();
 300 }
 301
 302 function common_text($txt) {
 303         global $xw;
 304         $xw->text($txt);
 305 }
 306
 307 function common_raw($xml) {
 308         global $xw;
 309         $xw->writeRaw($xml);
 310 }
 311
 312 function common_nav_menu() {
 313         $user = common_current_user();
 314         common_element_start('ul', array('id' => 'nav'));
 315         if ($user) {
 316                 common_menu_item(common_local_url('all', array('nickname' => $user->nickname)),
 317                                                  _('Home'));
 318         }
 319         common_menu_item(common_local_url('peoplesearch'), _('Search'));
 320         if ($user) {
 321                 common_menu_item(common_local_url('profilesettings'),
 322                                                  _('Settings'));
 323                 common_menu_item(common_local_url('invite'),
 324                                                  _('Invite'));
 325                 common_menu_item(common_local_url('logout'),
 326                                                  _('Logout'));
 327         } else {
 328                 common_menu_item(common_local_url('login'), _('Login'));
 329                 if (!common_config('site', 'closed')) {
 330                         common_menu_item(common_local_url('register'), _('Register'));
 331                 }
 332                 common_menu_item(common_local_url('openidlogin'), _('OpenID'));
 333         }
 334         common_menu_item(common_local_url('doc', array('title' => 'help')),
 335                                          _('Help'));
 336         common_element_end('ul');
 337 }
 338
 339 function common_foot_menu() {
 340         common_element_start('ul', array('id' => 'nav_sub'));
 341         common_menu_item(common_local_url('doc', array('title' => 'help')),
 342                                          _('Help'));
 343         common_menu_item(common_local_url('doc', array('title' => 'about')),
 344                                          _('About'));
 345         common_menu_item(common_local_url('doc', array('title' => 'faq')),
 346                                          _('FAQ'));
 347         common_menu_item(common_local_url('doc', array('title' => 'privacy')),
 348                                          _('Privacy'));
 349         common_menu_item(common_local_url('doc', array('title' => 'source')),
 350                                          _('Source'));
 351         common_menu_item(common_local_url('doc', array('title' => 'contact')),
 352                                          _('Contact'));
 353         common_element_end('ul');
 354 }
 355
 356 function common_menu_item($url, $text, $title=NULL, $is_selected=false) {
 357         $lattrs = array();
 358         if ($is_selected) {
 359                 $lattrs['class'] = 'current';
 360         }
 361         common_element_start('li', $lattrs);
 362         $attrs['href'] = $url;
 363         if ($title) {
 364                 $attrs['title'] = $title;
 365         }
 366         common_element('a', $attrs, $text);
 367         common_element_end('li');
 368 }
 369
 370 function common_input($id, $label, $value=NULL,$instructions=NULL) {
 371         common_element_start('p');
 372         common_element('label', array('for' => $id), $label);
 373         $attrs = array('name' => $id,
 374                                    'type' => 'text',
 375                                    'class' => 'input_text',
 376                                    'id' => $id);
 377         if ($value) {
 378                 $attrs['value'] = htmlspecialchars($value);
 379         }
 380         common_element('input', $attrs);
 381         if ($instructions) {
 382                 common_element('span', 'input_instructions', $instructions);
 383         }
 384         common_element_end('p');
 385 }
 386
 387 function common_checkbox($id, $label, $checked=false, $instructions=NULL, $value='true', $disabled=false)
 388 {
 389         common_element_start('p');
 390         $attrs = array('name' => $id,
 391                                    'type' => 'checkbox',
 392                                    'class' => 'checkbox',
 393                                    'id' => $id);
 394         if ($value) {
 395                 $attrs['value'] = htmlspecialchars($value);
 396         }
 397         if ($checked) {
 398                 $attrs['checked'] = 'checked';
 399         }
 400         if ($disabled) {
 401                 $attrs['disabled'] = 'true';
 402         }
 403         common_element('input', $attrs);
 404         # XXX: use a <label>
 405         common_text(' ');
 406         common_element('span', 'checkbox_label', $label);
 407         common_text(' ');
 408         if ($instructions) {
 409                 common_element('span', 'input_instructions', $instructions);
 410         }
 411         common_element_end('p');
 412 }
 413
 414 function common_dropdown($id, $label, $content, $instructions=NULL, $blank_select=FALSE, $selected=NULL) {
 415         common_element_start('p');
 416         common_element('label', array('for' => $id), $label);
 417         common_element_start('select', array('id' => $id, 'name' => $id));
 418         if ($blank_select) {
 419                 common_element('option', array('value' => ''));
 420         }
 421         foreach ($content as $value => $option) {
 422                 if ($value == $selected) {
 423                         common_element('option', array('value' => $value, 'selected' => $value), $option);
 424                 } else {
 425                         common_element('option', array('value' => $value), $option);
 426                 }
 427         }
 428         common_element_end('select');
 429         if ($instructions) {
 430                 common_element('span', 'input_instructions', $instructions);
 431         }
 432         common_element_end('p');
 433 }
 434 function common_hidden($id, $value) {
 435         common_element('input', array('name' => $id,
 436                                                                   'type' => 'hidden',
 437                                                                   'id' => $id,
 438                                                                   'value' => $value));
 439 }
 440
 441 function common_password($id, $label, $instructions=NULL) {
 442         common_element_start('p');
 443         common_element('label', array('for' => $id), $label);
 444         $attrs = array('name' => $id,
 445                                    'type' => 'password',
 446                                    'class' => 'password',
 447                                    'id' => $id);
 448         common_element('input', $attrs);
 449         if ($instructions) {
 450                 common_element('span', 'input_instructions', $instructions);
 451         }
 452         common_element_end('p');
 453 }
 454
 455 function common_submit($id, $label, $cls='submit') {
 456         global $xw;
 457         common_element_start('p');
 458         common_element('input', array('type' => 'submit',
 459                                                                   'id' => $id,
 460                                                                   'name' => $id,
 461                                                                   'class' => $cls,
 462                                                                   'value' => $label));
 463         common_element_end('p');
 464 }
 465
 466 function common_textarea($id, $label, $content=NULL, $instructions=NULL) {
 467         common_element_start('p');
 468         common_element('label', array('for' => $id), $label);
 469         common_element('textarea', array('rows' => 3,
 470                                                                          'cols' => 40,
 471                                                                          'name' => $id,
 472                                                                          'id' => $id),
 473                                    ($content) ? $content : '');
 474         if ($instructions) {
 475                 common_element('span', 'input_instructions', $instructions);
 476         }
 477         common_element_end('p');
 478 }
 479
 480 function common_timezone() {
 481         if (common_logged_in()) {
 482                 $user = common_current_user();
 483                 if ($user->timezone) {
 484                         return $user->timezone;
 485                 }
 486         }
 487
 488         global $config;
 489         return $config['site']['timezone'];
 490 }
 491
 492 function common_language() {
 493
 494         // If there is a user logged in and they've set a language preference
 495         // then return that one...
 496         if (common_logged_in()) {
 497                 $user = common_current_user();
 498                 $user_language = $user->language;
 499                 if ($user_language)
 500                         return $user_language;
 501         }
 502
 503         // Otherwise, find the best match for the languages requested by the
 504         // user's browser...
 505         $httplang = isset($_SERVER['HTTP_ACCEPT_LANGUAGE']) ? $_SERVER['HTTP_ACCEPT_LANGUAGE'] : NULL;
 506         if (!empty($httplang)) {
 507                 $language = client_prefered_language($httplang);
 508                 if ($language)
 509                         return $language;
 510         }
 511
 512         // Finally, if none of the above worked, use the site's default...
 513         return common_config('site', 'language');
 514 }
 515 # salted, hashed passwords are stored in the DB
 516
 517 function common_munge_password($password, $id) {
 518         return md5($password . $id);
 519 }
 520
 521 # check if a username exists and has matching password
 522 function common_check_user($nickname, $password) {
 523         # NEVER allow blank passwords, even if they match the DB
 524         if (mb_strlen($password) == 0) {
 525                 return false;
 526         }
 527         $user = User::staticGet('nickname', $nickname);
 528         if (is_null($user)) {
 529                 return false;
 530         } else {
 531                 if (0 == strcmp(common_munge_password($password, $user->id),
 532                                                 $user->password)) {
 533                         return $user;
 534                 } else {
 535                         return false;
 536                 }
 537         }
 538 }
 539
 540 # is the current user logged in?
 541 function common_logged_in() {
 542         return (!is_null(common_current_user()));
 543 }
 544
 545 function common_have_session() {
 546         return (0 != strcmp(session_id(), ''));
 547 }
 548
 549 function common_ensure_session() {
 550         if (!common_have_session()) {
 551                 @session_start();
 552         }
 553 }
 554
 555 # Three kinds of arguments:
 556 # 1) a user object
 557 # 2) a nickname
 558 # 3) NULL to clear
 559
 560 # Initialize to false; set to NULL if none found
 561
 562 $_cur = false;
 563
 564 function common_set_user($user) {
 565
 566     global $_cur;
 567
 568         if (is_null($user) && common_have_session()) {
 569         $_cur = NULL;
 570                 unset($_SESSION['userid']);
 571                 return true;
 572         } else if (is_string($user)) {
 573                 $nickname = $user;
 574                 $user = User::staticGet('nickname', $nickname);
 575         } else if (!($user instanceof User)) {
 576                 return false;
 577         }
 578
 579         if ($user) {
 580                 common_ensure_session();
 581                 $_SESSION['userid'] = $user->id;
 582         $_cur = $user;
 583                 return $_cur;
 584         }
 585         return false;
 586 }
 587
 588 function common_set_cookie($key, $value, $expiration=0) {
 589         $path = common_config('site', 'path');
 590         $server = common_config('site', 'server');
 591
 592         if ($path && ($path != '/')) {
 593                 $cookiepath = '/' . $path . '/';
 594         } else {
 595                 $cookiepath = '/';
 596         }
 597         return setcookie($key,
 598                          $value,
 599                                  $expiration,
 600                                          $cookiepath,
 601                                      $server);
 602 }
 603
 604 define('REMEMBERME', 'rememberme');
 605 define('REMEMBERME_EXPIRY', 30 * 24 * 60 * 60); # 30 days
 606
 607 function common_rememberme($user=NULL) {
 608         if (!$user) {
 609                 $user = common_current_user();
 610                 if (!$user) {
 611                         common_debug('No current user to remember', __FILE__);
 612                         return false;
 613                 }
 614         }
 615
 616         $rm = new Remember_me();
 617
 618         $rm->code = common_good_rand(16);
 619         $rm->user_id = $user->id;
 620
 621     # Wrap the insert in some good ol' fashioned transaction code
 622
 623     $rm->query('BEGIN');
 624
 625         $result = $rm->insert();
 626
 627         if (!$result) {
 628                 common_log_db_error($rm, 'INSERT', __FILE__);
 629                 common_debug('Error adding rememberme record for ' . $user->nickname, __FILE__);
 630                 return false;
 631     }
 632
 633     $rm->query('COMMIT');
 634
 635         common_debug('Inserted rememberme record (' . $rm->code . ', ' . $rm->user_id . '); result = ' . $result . '.', __FILE__);
 636
 637     $cookieval = $rm->user_id . ':' . $rm->code;
 638
 639         common_log(LOG_INFO, 'adding rememberme cookie "' . $cookieval . '" for ' . $user->nickname);
 640
 641         common_set_cookie(REMEMBERME, $cookieval, time() + REMEMBERME_EXPIRY);
 642
 643         return true;
 644 }
 645
 646 function common_remembered_user() {
 647
 648         $user = NULL;
 649
 650         $packed = isset($_COOKIE[REMEMBERME]) ? $_COOKIE[REMEMBERME] : NULL;
 651
 652         if (!$packed) {
 653         return NULL;
 654     }
 655
 656     list($id, $code) = explode(':', $packed);
 657
 658     if (!$id || !$code) {
 659         common_log(LOG_WARNING, 'Malformed rememberme cookie: ' . $packed);
 660         common_forgetme();
 661         return NULL;
 662     }
 663
 664     $rm = Remember_me::staticGet($code);
 665
 666     if (!$rm) {
 667         common_log(LOG_WARNING, 'No such remember code: ' . $code);
 668         common_forgetme();
 669         return NULL;
 670     }
 671
 672     if ($rm->user_id != $id) {
 673         common_log(LOG_WARNING, 'Rememberme code for wrong user: ' . $rm->user_id . ' != ' . $id);
 674         common_forgetme();
 675         return NULL;
 676     }
 677
 678     $user = User::staticGet($rm->user_id);
 679
 680     if (!$user) {
 681         common_log(LOG_WARNING, 'No such user for rememberme: ' . $rm->user_id);
 682         common_forgetme();
 683         return NULL;
 684     }
 685
 686         # successful!
 687     $result = $rm->delete();
 688
 689     if (!$result) {
 690         common_log_db_error($rm, 'DELETE', __FILE__);
 691         common_log(LOG_WARNING, 'Could not delete rememberme: ' . $code);
 692         common_forgetme();
 693         return NULL;
 694     }
 695
 696     common_log(LOG_INFO, 'logging in ' . $user->nickname . ' using rememberme code ' . $rm->code);
 697
 698     common_set_user($user);
 699     common_real_login(false);
 700
 701     # We issue a new cookie, so they can log in
 702     # automatically again after this session
 703
 704     common_rememberme($user);
 705
 706         return $user;
 707 }
 708
 709 # must be called with a valid user!
 710
 711 function common_forgetme() {
 712         common_set_cookie(REMEMBERME, '', 0);
 713 }
 714
 715 # who is the current user?
 716 function common_current_user() {
 717     global $_cur;
 718
 719     if ($_cur === false) {
 720
 721         if (isset($_REQUEST[session_name()]) || (isset($_SESSION['userid']) && $_SESSION['userid'])) {
 722             common_ensure_session();
 723             $id = isset($_SESSION['userid']) ? $_SESSION['userid'] : false;
 724             if ($id) {
 725                 $_cur = User::staticGet($id);
 726                 return $_cur;
 727             }
 728         }
 729
 730         # that didn't work; try to remember; will init $_cur to NULL on failure
 731         $_cur = common_remembered_user();
 732
 733         if ($_cur) {
 734             common_debug("Got User " . $_cur->nickname);
 735             common_debug("Faking session on remembered user");
 736             # XXX: Is this necessary?
 737             $_SESSION['userid'] = $_cur->id;
 738         }
 739     }
 740
 741         return $_cur;
 742 }
 743
 744 # Logins that are 'remembered' aren't 'real' -- they're subject to
 745 # cookie-stealing. So, we don't let them do certain things. New reg,
 746 # OpenID, and password logins _are_ real.
 747
 748 function common_real_login($real=true) {
 749         common_ensure_session();
 750         $_SESSION['real_login'] = $real;
 751 }
 752
 753 function common_is_real_login() {
 754         return common_logged_in() && $_SESSION['real_login'];
 755 }
 756
 757 # get canonical version of nickname for comparison
 758 function common_canonical_nickname($nickname) {
 759         # XXX: UTF-8 canonicalization (like combining chars)
 760         return strtolower($nickname);
 761 }
 762
 763 # get canonical version of email for comparison
 764 function common_canonical_email($email) {
 765         # XXX: canonicalize UTF-8
 766         # XXX: lcase the domain part
 767         return $email;
 768 }
 769
 770 define('URL_REGEX', '^|[ \t\r\n])((ftp|http|https|gopher|mailto|news|nntp|telnet|wais|file|prospero|aim|webcal):(([A-Za-z0-9$_.+!*(),;/?:@&~=-])|%[A-Fa-f0-9]{2}){2,}(#([a-zA-Z0-9][a-zA-Z0-9$_.+!*(),;/?:@&~=%-]*))?([A-Za-z0-9$_+!*();/?:~-]))');
 771
 772 function common_render_content($text, $notice) {
 773         $r = common_render_text($text);
 774         $id = $notice->profile_id;
 775         $r = preg_replace('/(^|\s+)@([A-Za-z0-9]{1,64})/e', "'\\1@'.common_at_link($id, '\\2')", $r);
 776         $r = preg_replace('/^T ([A-Z0-9]{1,64}) /e', "'T '.common_at_link($id, '\\1').' '", $r);
 777         $r = preg_replace('/(^|\s+)@#([A-Za-z0-9]{1,64})/e', "'\\1@#'.common_at_hash_link($id, '\\2')", $r);
 778         return $r;
 779 }
 780
 781 function common_render_text($text) {
 782         $r = htmlspecialchars($text);
 783
 784         $r = preg_replace('/[\x{0}-\x{8}\x{b}-\x{c}\x{e}-\x{19}]/', '', $r);
 785         $r = preg_replace_callback('@https?://[^\]>\s]+@', 'common_render_uri_thingy', $r);
 786         $r = preg_replace('/(^|\s+)#([A-Za-z0-9_\-\.]{1,64})/e', "'\\1#'.common_tag_link('\\2')", $r);
 787         # XXX: machine tags
 788         return $r;
 789 }
 790
 791 function common_render_uri_thingy($matches) {
 792         $uri = $matches[0];
 793         $trailer = '';
 794
 795         # Some heuristics for extracting URIs from surrounding punctuation
 796         # Strip from trailing text...
 797         if (preg_match('/^(.*)([,.:"\']+)$/', $uri, $matches)) {
 798                 $uri = $matches[1];
 799                 $trailer = $matches[2];
 800         }
 801
 802         $pairs = array(
 803                 ']' => '[', # technically disallowed in URIs, but used in Java docs
 804                 ')' => '(', # far too frequent in Wikipedia and MSDN
 805         );
 806         $final = substr($uri, -1, 1);
 807         if (isset($pairs[$final])) {
 808                 $openers = substr_count($uri, $pairs[$final]);
 809                 $closers = substr_count($uri, $final);
 810                 if ($closers > $openers) {
 811                         // Assume the paren was opened outside the URI
 812                         $uri = substr($uri, 0, -1);
 813                         $trailer = $final . $trailer;
 814                 }
 815         }
 816         if ($longurl = common_longurl($uri)) {
 817                 $longurl = htmlentities($longurl, ENT_QUOTES, 'UTF-8');
 818                 $title = " title='$longurl'";
 819         }
 820         else $title = '';
 821
 822         return '<a href="' . $uri . '"' . $title . ' class="extlink">' . $uri . '</a>' . $trailer;
 823 }
 824
 825 function common_longurl($short_url)  {
 826     $long_url = common_shorten_link($short_url, true);
 827     if ($long_url === $short_url) return false;
 828     return $long_url;
 829 }
 830
 831 function common_longurl2($uri)  {
 832         $uri_e = urlencode($uri);
 833         $longurl = unserialize(file_get_contents("http://api.longurl.org/v1/expand?format=php&url=$uri_e"));
 834         if (empty($longurl['long_url']) || $uri === $longurl['long_url']) return false;
 835         return stripslashes($longurl['long_url']);
 836 }
 837
 838 function common_shorten_links($text) {
 839     if (mb_strlen($text) <= 140) return $text;
 840     static $cache = array();
 841     if (isset($cache[$text])) return $cache[$text];
 842     // \s = not a horizontal whitespace character (since PHP 5.2.4)
 843         return $cache[$text] = preg_replace('@https?://[^)\]>\s]+@e', "common_shorten_link('\\0')", $text);
 844 }
 845
 846 function common_shorten_link($long_url) {
 847
 848         $user = common_current_user();
 849
 850         $curlh = curl_init();
 851         curl_setopt($curlh, CURLOPT_CONNECTTIMEOUT, 20); // # seconds to wait
 852         curl_setopt($curlh, CURLOPT_USERAGENT, 'Laconica');
 853         curl_setopt($curlh, CURLOPT_RETURNTRANSFER, true);
 854
 855         switch($user->urlshorteningservice) {
 856         case 'ur1.ca':
 857             $short_url_service = new LilUrl;
 858             $short_url = $short_url_service->shorten($url);
 859             break;
 860
 861         case '2tu.us':
 862             $short_url_service = new TightUrl;
 863             $short_url = $short_url_service->shorten($url);
 864             break;
 865
 866         case 'ptiturl.com':
 867             $short_url_service = new PtitUrl;
 868             $short_url = $short_url_service->shorten($url);
 869             break;
 870
 871         case 'bit.ly':
 872                         curl_setopt($curlh, CURLOPT_URL, 'http://bit.ly/api?method=shorten&long_url='.urlencode($url));
 873                         $short_url = current(json_decode(curl_exec($curlh))->results)->hashUrl;
 874             break;
 875
 876                 case 'is.gd':
 877                         curl_setopt($curlh, CURLOPT_URL, 'http://is.gd/api.php?longurl='.urlencode($url));
 878                         $short_url = curl_exec($curlh);
 879                         break;
 880                 case 'snipr.com':
 881                         curl_setopt($curlh, CURLOPT_URL, 'http://snipr.com/site/snip?r=simple&link='.urlencode($url));
 882                         $short_url = curl_exec($curlh);
 883                         break;
 884                 case 'metamark.net':
 885                         curl_setopt($curlh, CURLOPT_URL, 'http://metamark.net/api/rest/simple?long_url='.urlencode($url));
 886                         $short_url = curl_exec($curlh);
 887                         break;
 888                 case 'tinyurl.com':
 889                         curl_setopt($curlh, CURLOPT_URL, 'http://tinyurl.com/api-create.php?url='.urlencode($url));
 890                         $short_url = curl_exec($curlh);
 891                         break;
 892                 default:
 893                         $short_url = false;
 894         }
 895
 896         curl_close($curlh);
 897
 898         if ($short_url) {
 899         $url_cache[(string)$short_url] = $url;
 900                 return (string)$short_url;
 901         }
 902         return $url;
 903 }
 904
 905 function common_xml_safe_str($str) {
 906         $xmlStr = htmlentities(iconv('UTF-8', 'UTF-8//IGNORE', $str), ENT_NOQUOTES, 'UTF-8');
 907
 908         // Replace control, formatting, and surrogate characters with '*', ala Twitter
 909         return preg_replace('/[\p{Cc}\p{Cf}\p{Cs}]/u', '*', $str);
 910 }
 911
 912 function common_tag_link($tag) {
 913         $canonical = common_canonical_tag($tag);
 914         $url = common_local_url('tag', array('tag' => $canonical));
 915         return '<a href="' . htmlspecialchars($url) . '" rel="tag" class="hashlink">' . htmlspecialchars($tag) . '</a>';
 916 }
 917
 918 function common_canonical_tag($tag) {
 919         return strtolower(str_replace(array('-', '_', '.'), '', $tag));
 920 }
 921
 922 function common_valid_profile_tag($str) {
 923         return preg_match('/^[A-Za-z0-9_\-\.]{1,64}$/', $str);
 924 }
 925
 926 function common_at_link($sender_id, $nickname) {
 927         $sender = Profile::staticGet($sender_id);
 928         $recipient = common_relative_profile($sender, common_canonical_nickname($nickname));
 929         if ($recipient) {
 930                 return '<a href="'.htmlspecialchars($recipient->profileurl).'" class="atlink">'.$nickname.'</a>';
 931         } else {
 932                 return $nickname;
 933         }
 934 }
 935
 936 function common_at_hash_link($sender_id, $tag) {
 937         $user = User::staticGet($sender_id);
 938         if (!$user) {
 939                 return $tag;
 940         }
 941         $tagged = Profile_tag::getTagged($user->id, common_canonical_tag($tag));
 942         if ($tagged) {
 943                 $url = common_local_url('subscriptions',
 944                                                                 array('nickname' => $user->nickname,
 945                                                                           'tag' => $tag));
 946                 return '<a href="'.htmlspecialchars($url).'" class="atlink">'.$tag.'</a>';
 947         } else {
 948                 return $tag;
 949         }
 950 }
 951
 952 function common_relative_profile($sender, $nickname, $dt=NULL) {
 953         # Try to find profiles this profile is subscribed to that have this nickname
 954         $recipient = new Profile();
 955         # XXX: use a join instead of a subquery
 956         $recipient->whereAdd('EXISTS (SELECT subscribed from subscription where subscriber = '.$sender->id.' and subscribed = id)', 'AND');
 957         $recipient->whereAdd('nickname = "' . trim($nickname) . '"', 'AND');
 958         if ($recipient->find(TRUE)) {
 959                 # XXX: should probably differentiate between profiles with
 960                 # the same name by date of most recent update
 961                 return $recipient;
 962         }
 963         # Try to find profiles that listen to this profile and that have this nickname
 964         $recipient = new Profile();
 965         # XXX: use a join instead of a subquery
 966         $recipient->whereAdd('EXISTS (SELECT subscriber from subscription where subscribed = '.$sender->id.' and subscriber = id)', 'AND');
 967         $recipient->whereAdd('nickname = "' . trim($nickname) . '"', 'AND');
 968         if ($recipient->find(TRUE)) {
 969                 # XXX: should probably differentiate between profiles with
 970                 # the same name by date of most recent update
 971                 return $recipient;
 972         }
 973         # If this is a local user, try to find a local user with that nickname.
 974         $sender = User::staticGet($sender->id);
 975         if ($sender) {
 976                 $recipient_user = User::staticGet('nickname', $nickname);
 977                 if ($recipient_user) {
 978                         return $recipient_user->getProfile();
 979                 }
 980         }
 981         # Otherwise, no links. @messages from local users to remote users,
 982         # or from remote users to other remote users, are just
 983         # outside our ability to make intelligent guesses about
 984         return NULL;
 985 }
 986
 987 // where should the avatar go for this user?
 988
 989 function common_avatar_filename($id, $extension, $size=NULL, $extra=NULL) {
 990         global $config;
 991
 992         if ($size) {
 993                 return $id . '-' . $size . (($extra) ? ('-' . $extra) : '') . $extension;
 994         } else {
 995                 return $id . '-original' . (($extra) ? ('-' . $extra) : '') . $extension;
 996         }
 997 }
 998
 999 function common_avatar_path($filename) {
1000         global $config;
1001         return INSTALLDIR . '/avatar/' . $filename;
1002 }
1003
1004 function common_avatar_url($filename) {
1005         return common_path('avatar/'.$filename);
1006 }
1007
1008 function common_avatar_display_url($avatar) {
1009         $server = common_config('avatar', 'server');
1010         if ($server) {
1011                 return 'http://'.$server.'/'.$avatar->filename;
1012         } else {
1013                 return $avatar->url;
1014         }
1015 }
1016
1017 function common_default_avatar($size) {
1018         static $sizenames = array(AVATAR_PROFILE_SIZE => 'profile',
1019                                                           AVATAR_STREAM_SIZE => 'stream',
1020                                                           AVATAR_MINI_SIZE => 'mini');
1021         return theme_path('default-avatar-'.$sizenames[$size].'.png');
1022 }
1023
1024 function common_local_url($action, $args=NULL, $fragment=NULL) {
1025         $url = NULL;
1026         if (common_config('site','fancy')) {
1027                 $url = common_fancy_url($action, $args);
1028         } else {
1029                 $url = common_simple_url($action, $args);
1030         }
1031         if (!is_null($fragment)) {
1032                 $url .= '#'.$fragment;
1033         }
1034         return $url;
1035 }
1036
1037 function common_fancy_url($action, $args=NULL) {
1038         switch (strtolower($action)) {
1039          case 'public':
1040                 if ($args && isset($args['page'])) {
1041                         return common_path('?page=' . $args['page']);
1042                 } else {
1043                         return common_path('');
1044                 }
1045          case 'featured':
1046                 if ($args && isset($args['page'])) {
1047                         return common_path('featured?page=' . $args['page']);
1048                 } else {
1049                         return common_path('featured');
1050                 }
1051          case 'favorited':
1052                 if ($args && isset($args['page'])) {
1053                         return common_path('favorited?page=' . $args['page']);
1054                 } else {
1055                         return common_path('favorited');
1056                 }
1057          case 'publicrss':
1058                 return common_path('rss');
1059          case 'publicxrds':
1060                 return common_path('xrds');
1061          case 'featuredrss':
1062                 return common_path('featuredrss');
1063          case 'favoritedrss':
1064                 return common_path('favoritedrss');
1065          case 'opensearch':
1066                 if ($args && $args['type']) {
1067                         return common_path('opensearch/'.$args['type']);
1068                 } else {
1069                         return common_path('opensearch/people');
1070                 }
1071          case 'doc':
1072                 return common_path('doc/'.$args['title']);
1073          case 'login':
1074          case 'logout':
1075          case 'subscribe':
1076          case 'unsubscribe':
1077          case 'invite':
1078                 return common_path('main/'.$action);
1079          case 'tagother':
1080                 return common_path('main/tagother?id='.$args['id']);
1081          case 'register':
1082                 if ($args && $args['code']) {
1083                         return common_path('main/register/'.$args['code']);
1084                 } else {
1085                         return common_path('main/register');
1086                 }
1087          case 'remotesubscribe':
1088                 if ($args && $args['nickname']) {
1089                         return common_path('main/remote?nickname=' . $args['nickname']);
1090                 } else {
1091                         return common_path('main/remote');
1092                 }
1093          case 'nudge':
1094                 return common_path($args['nickname'].'/nudge');
1095          case 'openidlogin':
1096                 return common_path('main/openid');
1097          case 'profilesettings':
1098                 return common_path('settings/profile');
1099          case 'emailsettings':
1100                 return common_path('settings/email');
1101          case 'openidsettings':
1102                 return common_path('settings/openid');
1103          case 'smssettings':
1104                 return common_path('settings/sms');
1105          case 'twittersettings':
1106                 return common_path('settings/twitter');
1107          case 'othersettings':
1108                 return common_path('settings/other');
1109          case 'newnotice':
1110                 if ($args && $args['replyto']) {
1111                         return common_path('notice/new?replyto='.$args['replyto']);
1112                 } else {
1113                         return common_path('notice/new');
1114                 }
1115          case 'shownotice':
1116                 return common_path('notice/'.$args['notice']);
1117          case 'deletenotice':
1118                 if ($args && $args['notice']) {
1119                         return common_path('notice/delete/'.$args['notice']);
1120                 } else {
1121                         return common_path('notice/delete');
1122                 }
1123          case 'microsummary':
1124          case 'xrds':
1125          case 'foaf':
1126                 return common_path($args['nickname'].'/'.$action);
1127          case 'all':
1128          case 'replies':
1129          case 'inbox':
1130          case 'outbox':
1131                 if ($args && isset($args['page'])) {
1132                         return common_path($args['nickname'].'/'.$action.'?page=' . $args['page']);
1133                 } else {
1134                         return common_path($args['nickname'].'/'.$action);
1135                 }
1136          case 'subscriptions':
1137          case 'subscribers':
1138                 $nickname = $args['nickname'];
1139                 unset($args['nickname']);
1140                 if (isset($args['tag'])) {
1141                         $tag = $args['tag'];
1142                         unset($args['tag']);
1143                 }
1144                 $params = http_build_query($args);
1145                 if ($params) {
1146                         return common_path($nickname.'/'.$action . (($tag) ? '/' . $tag : '') . '?' . $params);
1147                 } else {
1148                         return common_path($nickname.'/'.$action . (($tag) ? '/' . $tag : ''));
1149                 }
1150          case 'allrss':
1151                 return common_path($args['nickname'].'/all/rss');
1152          case 'repliesrss':
1153                 return common_path($args['nickname'].'/replies/rss');
1154          case 'userrss':
1155         if (isset($args['limit']))
1156                     return common_path($args['nickname'].'/rss?limit=' . $args['limit']);
1157                 return common_path($args['nickname'].'/rss');
1158          case 'showstream':
1159                 if ($args && isset($args['page'])) {
1160                         return common_path($args['nickname'].'?page=' . $args['page']);
1161                 } else {
1162                         return common_path($args['nickname']);
1163                 }
1164
1165          case 'usertimeline':
1166                 return common_path("api/statuses/user_timeline/".$args['nickname'].".atom");
1167          case 'confirmaddress':
1168                 return common_path('main/confirmaddress/'.$args['code']);
1169          case 'userbyid':
1170                 return common_path('user/'.$args['id']);
1171          case 'recoverpassword':
1172             $path = 'main/recoverpassword';
1173             if ($args['code']) {
1174                 $path .= '/' . $args['code'];
1175                 }
1176             return common_path($path);
1177          case 'imsettings':
1178                 return common_path('settings/im');
1179          case 'peoplesearch':
1180                 return common_path('search/people' . (($args) ? ('?' . http_build_query($args)) : ''));
1181          case 'noticesearch':
1182                 return common_path('search/notice' . (($args) ? ('?' . http_build_query($args)) : ''));
1183          case 'noticesearchrss':
1184                 return common_path('search/notice/rss' . (($args) ? ('?' . http_build_query($args)) : ''));
1185          case 'avatarbynickname':
1186                 return common_path($args['nickname'].'/avatar/'.$args['size']);
1187          case 'tag':
1188             if (isset($args['tag']) && $args['tag']) {
1189                         $path = 'tag/' . $args['tag'];
1190                         unset($args['tag']);
1191                 } else {
1192                         $path = 'tags';
1193                 }
1194                 return common_path($path . (($args) ? ('?' . http_build_query($args)) : ''));
1195          case 'peopletag':
1196                 $path = 'peopletag/' . $args['tag'];
1197                 unset($args['tag']);
1198                 return common_path($path . (($args) ? ('?' . http_build_query($args)) : ''));
1199          case 'tags':
1200                 return common_path('tags' . (($args) ? ('?' . http_build_query($args)) : ''));
1201          case 'favor':
1202                 return common_path('main/favor');
1203          case 'disfavor':
1204                 return common_path('main/disfavor');
1205          case 'showfavorites':
1206                 if ($args && isset($args['page'])) {
1207                         return common_path($args['nickname'].'/favorites?page=' . $args['page']);
1208                 } else {
1209                         return common_path($args['nickname'].'/favorites');
1210                 }
1211          case 'favoritesrss':
1212                 return common_path($args['nickname'].'/favorites/rss');
1213          case 'showmessage':
1214                 return common_path('message/' . $args['message']);
1215          case 'newmessage':
1216                 return common_path('message/new' . (($args) ? ('?' . http_build_query($args)) : ''));
1217          case 'api':
1218                 # XXX: do fancy URLs for all the API methods
1219                 switch (strtolower($args['apiaction'])) {
1220                  case 'statuses':
1221                         switch (strtolower($args['method'])) {
1222                          case 'user_timeline.rss':
1223                                 return common_path('api/statuses/user_timeline/'.$args['argument'].'.rss');
1224                          case 'user_timeline.atom':
1225                                 return common_path('api/statuses/user_timeline/'.$args['argument'].'.atom');
1226                          case 'user_timeline.json':
1227                                 return common_path('api/statuses/user_timeline/'.$args['argument'].'.json');
1228                          case 'user_timeline.xml':
1229                                 return common_path('api/statuses/user_timeline/'.$args['argument'].'.xml');
1230                          default: return common_simple_url($action, $args);
1231                         }
1232                  default: return common_simple_url($action, $args);
1233                 }
1234          case 'sup':
1235                 if ($args && isset($args['seconds'])) {
1236                         return common_path('main/sup?seconds='.$args['seconds']);
1237                 } else {
1238                         return common_path('main/sup');
1239                 }
1240          default:
1241                 return common_simple_url($action, $args);
1242         }
1243 }
1244
1245 function common_simple_url($action, $args=NULL) {
1246         global $config;
1247         /* XXX: pretty URLs */
1248         $extra = '';
1249         if ($args) {
1250                 foreach ($args as $key => $value) {
1251                         $extra .= "&${key}=${value}";
1252                 }
1253         }
1254         return common_path("index.php?action=${action}${extra}");
1255 }
1256
1257 function common_path($relative) {
1258         global $config;
1259         $pathpart = ($config['site']['path']) ? $config['site']['path']."/" : '';
1260         return "http://".$config['site']['server'].'/'.$pathpart.$relative;
1261 }
1262
1263 function common_date_string($dt) {
1264         // XXX: do some sexy date formatting
1265         // return date(DATE_RFC822, $dt);
1266         $t = strtotime($dt);
1267         $now = time();
1268         $diff = $now - $t;
1269
1270         if ($now < $t) { # that shouldn't happen!
1271                 return common_exact_date($dt);
1272         } else if ($diff < 60) {
1273                 return _('a few seconds ago');
1274         } else if ($diff < 92) {
1275                 return _('about a minute ago');
1276         } else if ($diff < 3300) {
1277                 return sprintf(_('about %d minutes ago'), round($diff/60));
1278         } else if ($diff < 5400) {
1279                 return _('about an hour ago');
1280         } else if ($diff < 22 * 3600) {
1281                 return sprintf(_('about %d hours ago'), round($diff/3600));
1282         } else if ($diff < 37 * 3600) {
1283                 return _('about a day ago');
1284         } else if ($diff < 24 * 24 * 3600) {
1285                 return sprintf(_('about %d days ago'), round($diff/(24*3600)));
1286         } else if ($diff < 46 * 24 * 3600) {
1287                 return _('about a month ago');
1288         } else if ($diff < 330 * 24 * 3600) {
1289                 return sprintf(_('about %d months ago'), round($diff/(30*24*3600)));
1290         } else if ($diff < 480 * 24 * 3600) {
1291                 return _('about a year ago');
1292         } else {
1293                 return common_exact_date($dt);
1294         }
1295 }
1296
1297 function common_exact_date($dt) {
1298     static $_utc;
1299     static $_siteTz;
1300
1301     if (!$_utc) {
1302         $_utc = new DateTimeZone('UTC');
1303         $_siteTz = new DateTimeZone(common_timezone());
1304     }
1305
1306         $dateStr = date('d F Y H:i:s', strtotime($dt));
1307         $d = new DateTime($dateStr, $_utc);
1308         $d->setTimezone($_siteTz);
1309         return $d->format(DATE_RFC850);
1310 }
1311
1312 function common_date_w3dtf($dt) {
1313         $dateStr = date('d F Y H:i:s', strtotime($dt));
1314         $d = new DateTime($dateStr, new DateTimeZone('UTC'));
1315         $d->setTimezone(new DateTimeZone(common_timezone()));
1316         return $d->format(DATE_W3C);
1317 }
1318
1319 function common_date_rfc2822($dt) {
1320         $dateStr = date('d F Y H:i:s', strtotime($dt));
1321         $d = new DateTime($dateStr, new DateTimeZone('UTC'));
1322         $d->setTimezone(new DateTimeZone(common_timezone()));
1323         return $d->format('r');
1324 }
1325
1326 function common_date_iso8601($dt) {
1327         $dateStr = date('d F Y H:i:s', strtotime($dt));
1328         $d = new DateTime($dateStr, new DateTimeZone('UTC'));
1329         $d->setTimezone(new DateTimeZone(common_timezone()));
1330         return $d->format('c');
1331 }
1332
1333 function common_sql_now() {
1334         return strftime('%Y-%m-%d %H:%M:%S', time());
1335 }
1336
1337 function common_redirect($url, $code=307) {
1338         static $status = array(301 => "Moved Permanently",
1339                                                    302 => "Found",
1340                                                    303 => "See Other",
1341                                                    307 => "Temporary Redirect");
1342         header("Status: ${code} $status[$code]");
1343         header("Location: $url");
1344
1345         common_start_xml('a',
1346                                          '-//W3C//DTD XHTML 1.0 Strict//EN',
1347                                          'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd');
1348         common_element('a', array('href' => $url), $url);
1349         common_end_xml();
1350     exit;
1351 }
1352
1353 function common_save_replies($notice) {
1354         # Alternative reply format
1355         $tname = false;
1356         if (preg_match('/^T ([A-Z0-9]{1,64}) /', $notice->content, $match)) {
1357                 $tname = $match[1];
1358         }
1359         # extract all @messages
1360         $cnt = preg_match_all('/(?:^|\s)@([a-z0-9]{1,64})/', $notice->content, $match);
1361
1362         $names = array();
1363
1364         if ($cnt || $tname) {
1365                 # XXX: is there another way to make an array copy?
1366                 $names = ($tname) ? array_unique(array_merge(array(strtolower($tname)), $match[1])) : array_unique($match[1]);
1367         }
1368
1369         $sender = Profile::staticGet($notice->profile_id);
1370
1371         $replied = array();
1372
1373         # store replied only for first @ (what user/notice what the reply directed,
1374         # we assume first @ is it)
1375
1376         for ($i=0; $i<count($names); $i++) {
1377                 $nickname = $names[$i];
1378                 $recipient = common_relative_profile($sender, $nickname, $notice->created);
1379                 if (!$recipient) {
1380                         continue;
1381                 }
1382                 if ($i == 0 && ($recipient->id != $sender->id) && !$notice->reply_to) { # Don't save reply to self
1383                         $reply_for = $recipient;
1384                         $recipient_notice = $reply_for->getCurrentNotice();
1385                         if ($recipient_notice) {
1386                                 $orig = clone($notice);
1387                                 $notice->reply_to = $recipient_notice->id;
1388                                 $notice->update($orig);
1389                         }
1390                 }
1391                 $reply = new Reply();
1392                 $reply->notice_id = $notice->id;
1393                 $reply->profile_id = $recipient->id;
1394                 $id = $reply->insert();
1395                 if (!$id) {
1396                         $last_error = &PEAR::getStaticProperty('DB_DataObject','lastError');
1397                         common_log(LOG_ERR, 'DB error inserting reply: ' . $last_error->message);
1398                         common_server_error(sprintf(_('DB error inserting reply: %s'), $last_error->message));
1399                         return;
1400                 } else {
1401                         $replied[$recipient->id] = 1;
1402                 }
1403         }
1404
1405         # Hash format replies, too
1406         $cnt = preg_match_all('/(?:^|\s)@#([a-z0-9]{1,64})/', $notice->content, $match);
1407         if ($cnt) {
1408                 foreach ($match[1] as $tag) {
1409                         $tagged = Profile_tag::getTagged($sender->id, $tag);
1410                         foreach ($tagged as $t) {
1411                                 if (!$replied[$t->id]) {
1412                                         $reply = new Reply();
1413                                         $reply->notice_id = $notice->id;
1414                                         $reply->profile_id = $t->id;
1415                                         $id = $reply->insert();
1416                                         if (!$id) {
1417                                                 common_log_db_error($reply, 'INSERT', __FILE__);
1418                                                 return;
1419                                         }
1420                                 }
1421                         }
1422                 }
1423         }
1424 }
1425
1426 function common_broadcast_notice($notice, $remote=false) {
1427
1428         // Check to see if notice should go to Twitter
1429         $flink = Foreign_link::getByUserID($notice->profile_id, 1); // 1 == Twitter
1430         if (($flink->noticesync & FOREIGN_NOTICE_SEND) == FOREIGN_NOTICE_SEND) {
1431
1432                 // If it's not a Twitter-style reply, or if the user WANTS to send replies...
1433
1434                 if (!preg_match('/^@[a-zA-Z0-9_]{1,15}\b/u', $notice->content) ||
1435                         (($flink->noticesync & FOREIGN_NOTICE_SEND_REPLY) == FOREIGN_NOTICE_SEND_REPLY)) {
1436
1437                         $result = common_twitter_broadcast($notice, $flink);
1438
1439                         if (!$result) {
1440                                 common_debug('Unable to send notice: ' . $notice->id . ' to Twitter.', __FILE__);
1441                         }
1442                 }
1443         }
1444
1445         if (common_config('queue', 'enabled')) {
1446                 # Do it later!
1447                 return common_enqueue_notice($notice);
1448         } else {
1449                 return common_real_broadcast($notice, $remote);
1450         }
1451 }
1452
1453 function common_twitter_broadcast($notice, $flink) {
1454         global $config;
1455         $success = true;
1456         $fuser = $flink->getForeignUser();
1457         $twitter_user = $fuser->nickname;
1458         $twitter_password = $flink->credentials;
1459         $uri = 'http://www.twitter.com/statuses/update.json';
1460
1461         // XXX: Hack to get around PHP cURL's use of @ being a a meta character
1462         $statustxt = preg_replace('/^@/', ' @', $notice->content);
1463
1464         $options = array(
1465                 CURLOPT_USERPWD                 => "$twitter_user:$twitter_password",
1466                 CURLOPT_POST                    => true,
1467                 CURLOPT_POSTFIELDS              => array(
1468                                                                         'status'        => $statustxt,
1469                                                                         'source'        => $config['integration']['source']
1470                                                                         ),
1471                 CURLOPT_RETURNTRANSFER  => true,
1472                 CURLOPT_FAILONERROR             => true,
1473                 CURLOPT_HEADER                  => false,
1474                 CURLOPT_FOLLOWLOCATION  => true,
1475                 CURLOPT_USERAGENT               => "Laconica",
1476                 CURLOPT_CONNECTTIMEOUT  => 120,  // XXX: Scary!!!! How long should this be?
1477                 CURLOPT_TIMEOUT                 => 120
1478         );
1479
1480         $ch = curl_init($uri);
1481     curl_setopt_array($ch, $options);
1482     $data = curl_exec($ch);
1483     $errmsg = curl_error($ch);
1484
1485         if ($errmsg) {
1486                 common_debug("cURL error: $errmsg - trying to send notice for $twitter_user.",
1487                         __FILE__);
1488                 $success = false;
1489         }
1490
1491         curl_close($ch);
1492
1493         if (!$data) {
1494                 common_debug("No data returned by Twitter's API trying to send update for $twitter_user",
1495                         __FILE__);
1496                 $success = false;
1497         }
1498
1499         // Twitter should return a status
1500         $status = json_decode($data);
1501
1502         if (!$status->id) {
1503                 common_debug("Unexpected data returned by Twitter API trying to send update for $twitter_user",
1504                         __FILE__);
1505                 $success = false;
1506         }
1507
1508         return $success;
1509 }
1510
1511 # Stick the notice on the queue
1512
1513 function common_enqueue_notice($notice) {
1514         foreach (array('jabber', 'omb', 'sms', 'public') as $transport) {
1515                 $qi = new Queue_item();
1516                 $qi->notice_id = $notice->id;
1517                 $qi->transport = $transport;
1518                 $qi->created = $notice->created;
1519         $result = $qi->insert();
1520                 if (!$result) {
1521                         $last_error = &PEAR::getStaticProperty('DB_DataObject','lastError');
1522                         common_log(LOG_ERR, 'DB error inserting queue item: ' . $last_error->message);
1523                         return false;
1524                 }
1525                 common_log(LOG_DEBUG, 'complete queueing notice ID = ' . $notice->id . ' for ' . $transport);
1526         }
1527         return $result;
1528 }
1529
1530 function common_dequeue_notice($notice) {
1531         $qi = Queue_item::staticGet($notice->id);
1532         if ($qi) {
1533                 $result = $qi->delete();
1534                 if (!$result) {
1535                     $last_error = &PEAR::getStaticProperty('DB_DataObject','lastError');
1536                     common_log(LOG_ERR, 'DB error deleting queue item: ' . $last_error->message);
1537                     return false;
1538                 }
1539                 common_log(LOG_DEBUG, 'complete dequeueing notice ID = ' . $notice->id);
1540                 return $result;
1541         } else {
1542             return false;
1543         }
1544 }
1545
1546 function common_real_broadcast($notice, $remote=false) {
1547         $success = true;
1548         if (!$remote) {
1549                 # Make sure we have the OMB stuff
1550                 require_once(INSTALLDIR.'/lib/omb.php');
1551                 $success = omb_broadcast_remote_subscribers($notice);
1552                 if (!$success) {
1553                         common_log(LOG_ERR, 'Error in OMB broadcast for notice ' . $notice->id);
1554                 }
1555         }
1556         if ($success) {
1557                 require_once(INSTALLDIR.'/lib/jabber.php');
1558                 $success = jabber_broadcast_notice($notice);
1559                 if (!$success) {
1560                         common_log(LOG_ERR, 'Error in jabber broadcast for notice ' . $notice->id);
1561                 }
1562         }
1563         if ($success) {
1564                 require_once(INSTALLDIR.'/lib/mail.php');
1565                 $success = mail_broadcast_notice_sms($notice);
1566                 if (!$success) {
1567                         common_log(LOG_ERR, 'Error in sms broadcast for notice ' . $notice->id);
1568                 }
1569         }
1570         if ($success) {
1571                 $success = jabber_public_notice($notice);
1572                 if (!$success) {
1573                         common_log(LOG_ERR, 'Error in public broadcast for notice ' . $notice->id);
1574                 }
1575         }
1576         // XXX: broadcast notices to other IM
1577         return $success;
1578 }
1579
1580 function common_broadcast_profile($profile) {
1581         // XXX: optionally use a queue system like http://code.google.com/p/microapps/wiki/NQDQ
1582         require_once(INSTALLDIR.'/lib/omb.php');
1583         omb_broadcast_profile($profile);
1584         // XXX: Other broadcasts...?
1585         return true;
1586 }
1587
1588 function common_profile_url($nickname) {
1589         return common_local_url('showstream', array('nickname' => $nickname));
1590 }
1591
1592 # Don't call if nobody's logged in
1593
1594 function common_notice_form($action=NULL, $content=NULL) {
1595         $user = common_current_user();
1596         assert(!is_null($user));
1597         common_element_start('form', array('id' => 'status_form',
1598                                                                            'method' => 'post',
1599                                                                            'action' => common_local_url('newnotice')));
1600         common_element_start('p');
1601         common_element('label', array('for' => 'status_textarea',
1602                                                                   'id' => 'status_label'),
1603                                    sprintf(_('What\'s up, %s?'), $user->nickname));
1604     common_element('span', array('id' => 'counter', 'class' => 'counter'), '140');
1605         common_element('textarea', array('id' => 'status_textarea',
1606                                                                          'cols' => 60,
1607                                                                          'rows' => 3,
1608                                                                          'name' => 'status_textarea'),
1609                                    ($content) ? $content : '');
1610         common_hidden('token', common_session_token());
1611         if ($action) {
1612                 common_hidden('returnto', $action);
1613         }
1614         # set by JavaScript
1615         common_hidden('inreplyto', 'false');
1616         common_element('input', array('id' => 'status_submit',
1617                                                                   'name' => 'status_submit',
1618                                                                   'type' => 'submit',
1619                                                                   'value' => _('Send')));
1620         common_element_end('p');
1621         common_element_end('form');
1622 }
1623
1624 # Should make up a reasonable root URL
1625
1626 function common_root_url() {
1627         return common_path('');
1628 }
1629
1630 # returns $bytes bytes of random data as a hexadecimal string
1631 # "good" here is a goal and not a guarantee
1632
1633 function common_good_rand($bytes) {
1634         # XXX: use random.org...?
1635         if (file_exists('/dev/urandom')) {
1636                 return common_urandom($bytes);
1637         } else { # FIXME: this is probably not good enough
1638                 return common_mtrand($bytes);
1639         }
1640 }
1641
1642 function common_urandom($bytes) {
1643         $h = fopen('/dev/urandom', 'rb');
1644         # should not block
1645         $src = fread($h, $bytes);
1646         fclose($h);
1647         $enc = '';
1648         for ($i = 0; $i < $bytes; $i++) {
1649                 $enc .= sprintf("%02x", (ord($src[$i])));
1650         }
1651         return $enc;
1652 }
1653
1654 function common_mtrand($bytes) {
1655         $enc = '';
1656         for ($i = 0; $i < $bytes; $i++) {
1657                 $enc .= sprintf("%02x", mt_rand(0, 255));
1658         }
1659         return $enc;
1660 }
1661
1662 function common_set_returnto($url) {
1663         common_ensure_session();
1664         $_SESSION['returnto'] = $url;
1665 }
1666
1667 function common_get_returnto() {
1668         common_ensure_session();
1669         return $_SESSION['returnto'];
1670 }
1671
1672 function common_timestamp() {
1673         return date('YmdHis');
1674 }
1675
1676 function common_ensure_syslog() {
1677         static $initialized = false;
1678         if (!$initialized) {
1679                 global $config;
1680                 openlog($config['syslog']['appname'], 0, LOG_USER);
1681                 $initialized = true;
1682         }
1683 }
1684
1685 function common_log($priority, $msg, $filename=NULL) {
1686         $logfile = common_config('site', 'logfile');
1687         if ($logfile) {
1688                 $log = fopen($logfile, "a");
1689                 if ($log) {
1690                         static $syslog_priorities = array('LOG_EMERG', 'LOG_ALERT', 'LOG_CRIT', 'LOG_ERR',
1691                                                                                           'LOG_WARNING', 'LOG_NOTICE', 'LOG_INFO', 'LOG_DEBUG');
1692                         $output = date('Y-m-d H:i:s') . ' ' . $syslog_priorities[$priority] . ': ' . $msg . "\n";
1693                         fwrite($log, $output);
1694                         fclose($log);
1695                 }
1696         } else {
1697                 common_ensure_syslog();
1698                 syslog($priority, $msg);
1699         }
1700 }
1701
1702 function common_debug($msg, $filename=NULL) {
1703         if ($filename) {
1704                 common_log(LOG_DEBUG, basename($filename).' - '.$msg);
1705         } else {
1706                 common_log(LOG_DEBUG, $msg);
1707         }
1708 }
1709
1710 function common_log_db_error(&$object, $verb, $filename=NULL) {
1711         $objstr = common_log_objstring($object);
1712         $last_error = &PEAR::getStaticProperty('DB_DataObject','lastError');
1713         common_log(LOG_ERR, $last_error->message . '(' . $verb . ' on ' . $objstr . ')', $filename);
1714 }
1715
1716 function common_log_objstring(&$object) {
1717         if (is_null($object)) {
1718                 return "NULL";
1719         }
1720         $arr = $object->toArray();
1721         $fields = array();
1722         foreach ($arr as $k => $v) {
1723                 $fields[] = "$k='$v'";
1724         }
1725         $objstring = $object->tableName() . '[' . implode(',', $fields) . ']';
1726         return $objstring;
1727 }
1728
1729 function common_valid_http_url($url) {
1730         return Validate::uri($url, array('allowed_schemes' => array('http', 'https')));
1731 }
1732
1733 function common_valid_tag($tag) {
1734         if (preg_match('/^tag:(.*?),(\d{4}(-\d{2}(-\d{2})?)?):(.*)$/', $tag, $matches)) {
1735                 return (Validate::email($matches[1]) ||
1736                                 preg_match('/^([\w-\.]+)$/', $matches[1]));
1737         }
1738         return false;
1739 }
1740
1741 # Does a little before-after block for next/prev page
1742
1743 function common_pagination($have_before, $have_after, $page, $action, $args=NULL) {
1744
1745         if ($have_before || $have_after) {
1746                 common_element_start('div', array('id' => 'pagination'));
1747                 common_element_start('ul', array('id' => 'nav_pagination'));
1748         }
1749
1750         if ($have_before) {
1751                 $pargs = array('page' => $page-1);
1752                 $newargs = ($args) ? array_merge($args,$pargs) : $pargs;
1753
1754                 common_element_start('li', 'before');
1755                 common_element('a', array('href' => common_local_url($action, $newargs)),
1756                                            _('« After'));
1757                 common_element_end('li');
1758         }
1759
1760         if ($have_after) {
1761                 $pargs = array('page' => $page+1);
1762                 $newargs = ($args) ? array_merge($args,$pargs) : $pargs;
1763                 common_element_start('li', 'after');
1764                 common_element('a', array('href' => common_local_url($action, $newargs)),
1765                                                    _('Before »'));
1766                 common_element_end('li');
1767         }
1768
1769         if ($have_before || $have_after) {
1770                 common_element_end('ul');
1771                 common_element_end('div');
1772         }
1773 }
1774
1775 /* Following functions are copied from MediaWiki GlobalFunctions.php
1776  * and written by Evan Prodromou. */
1777
1778 function common_accept_to_prefs($accept, $def = '*/*') {
1779         # No arg means accept anything (per HTTP spec)
1780         if(!$accept) {
1781                 return array($def => 1);
1782         }
1783
1784         $prefs = array();
1785
1786         $parts = explode(',', $accept);
1787
1788         foreach($parts as $part) {
1789                 # FIXME: doesn't deal with params like 'text/html; level=1'
1790                 @list($value, $qpart) = explode(';', $part);
1791                 $match = array();
1792                 if(!isset($qpart)) {
1793                         $prefs[$value] = 1;
1794                 } elseif(preg_match('/q\s*=\s*(\d*\.\d+)/', $qpart, $match)) {
1795                         $prefs[$value] = $match[1];
1796                 }
1797         }
1798
1799         return $prefs;
1800 }
1801
1802 function common_mime_type_match($type, $avail) {
1803         if(array_key_exists($type, $avail)) {
1804                 return $type;
1805         } else {
1806                 $parts = explode('/', $type);
1807                 if(array_key_exists($parts[0] . '/*', $avail)) {
1808                         return $parts[0] . '/*';
1809                 } elseif(array_key_exists('*/*', $avail)) {
1810                         return '*/*';
1811                 } else {
1812                         return NULL;
1813                 }
1814         }
1815 }
1816
1817 function common_negotiate_type($cprefs, $sprefs) {
1818         $combine = array();
1819
1820         foreach(array_keys($sprefs) as $type) {
1821                 $parts = explode('/', $type);
1822                 if($parts[1] != '*') {
1823                         $ckey = common_mime_type_match($type, $cprefs);
1824                         if($ckey) {
1825                                 $combine[$type] = $sprefs[$type] * $cprefs[$ckey];
1826                         }
1827                 }
1828         }
1829
1830         foreach(array_keys($cprefs) as $type) {
1831                 $parts = explode('/', $type);
1832                 if($parts[1] != '*' && !array_key_exists($type, $sprefs)) {
1833                         $skey = common_mime_type_match($type, $sprefs);
1834                         if($skey) {
1835                                 $combine[$type] = $sprefs[$skey] * $cprefs[$type];
1836                         }
1837                 }
1838         }
1839
1840         $bestq = 0;
1841         $besttype = "text/html";
1842
1843         foreach(array_keys($combine) as $type) {
1844                 if($combine[$type] > $bestq) {
1845                         $besttype = $type;
1846                         $bestq = $combine[$type];
1847                 }
1848         }
1849
1850         return $besttype;
1851 }
1852
1853 function common_config($main, $sub) {
1854         global $config;
1855         return isset($config[$main][$sub]) ? $config[$main][$sub] : false;
1856 }
1857
1858 function common_copy_args($from) {
1859         $to = array();
1860         $strip = get_magic_quotes_gpc();
1861         foreach ($from as $k => $v) {
1862                 $to[$k] = ($strip) ? stripslashes($v) : $v;
1863         }
1864         return $to;
1865 }
1866
1867 // Neutralise the evil effects of magic_quotes_gpc in the current request.
1868 // This is used before handing a request off to OAuthRequest::from_request.
1869 function common_remove_magic_from_request() {
1870         if(get_magic_quotes_gpc()) {
1871                 $_POST=array_map('stripslashes',$_POST);
1872                 $_GET=array_map('stripslashes',$_GET);
1873         }
1874 }
1875
1876 function common_user_uri(&$user) {
1877         return common_local_url('userbyid', array('id' => $user->id));
1878 }
1879
1880 function common_notice_uri(&$notice) {
1881         return common_local_url('shownotice',
1882                 array('notice' => $notice->id));
1883 }
1884
1885 # 36 alphanums - lookalikes (0, O, 1, I) = 32 chars = 5 bits
1886
1887 function common_confirmation_code($bits) {
1888         # 36 alphanums - lookalikes (0, O, 1, I) = 32 chars = 5 bits
1889         static $codechars = '23456789ABCDEFGHJKLMNPQRSTUVWXYZ';
1890         $chars = ceil($bits/5);
1891         $code = '';
1892         for ($i = 0; $i < $chars; $i++) {
1893                 # XXX: convert to string and back
1894                 $num = hexdec(common_good_rand(1));
1895                 # XXX: randomness is too precious to throw away almost
1896                 # 40% of the bits we get!
1897                 $code .= $codechars[$num%32];
1898         }
1899         return $code;
1900 }
1901
1902 # convert markup to HTML
1903
1904 function common_markup_to_html($c) {
1905         $c = preg_replace('/%%action.(\w+)%%/e', "common_local_url('\\1')", $c);
1906         $c = preg_replace('/%%doc.(\w+)%%/e', "common_local_url('doc', array('title'=>'\\1'))", $c);
1907         $c = preg_replace('/%%(\w+).(\w+)%%/e', 'common_config(\'\\1\', \'\\2\')', $c);
1908         return Markdown($c);
1909 }
1910
1911 function common_profile_avatar_url($profile, $size=AVATAR_PROFILE_SIZE) {
1912         $avatar = $profile->getAvatar($size);
1913         if ($avatar) {
1914                 return common_avatar_display_url($avatar);
1915         } else {
1916                 return common_default_avatar($size);
1917         }
1918 }
1919
1920 function common_profile_uri($profile) {
1921         if (!$profile) {
1922                 return NULL;
1923         }
1924         $user = User::staticGet($profile->id);
1925         if ($user) {
1926                 return $user->uri;
1927         }
1928
1929         $remote = Remote_profile::staticGet($profile->id);
1930         if ($remote) {
1931                 return $remote->uri;
1932         }
1933         # XXX: this is a very bad profile!
1934         return NULL;
1935 }
1936
1937 function common_canonical_sms($sms) {
1938         # strip non-digits
1939         preg_replace('/\D/', '', $sms);
1940         return $sms;
1941 }
1942
1943 function common_error_handler($errno, $errstr, $errfile, $errline, $errcontext) {
1944     switch ($errno) {
1945      case E_USER_ERROR:
1946                 common_log(LOG_ERR, "[$errno] $errstr ($errfile:$errline)");
1947                 exit(1);
1948                 break;
1949
1950          case E_USER_WARNING:
1951                 common_log(LOG_WARNING, "[$errno] $errstr ($errfile:$errline)");
1952                 break;
1953
1954      case E_USER_NOTICE:
1955                 common_log(LOG_NOTICE, "[$errno] $errstr ($errfile:$errline)");
1956                 break;
1957     }
1958
1959         # FIXME: show error page if we're on the Web
1960     /* Don't execute PHP internal error handler */
1961     return true;
1962 }
1963
1964 function common_session_token() {
1965         common_ensure_session();
1966         if (!array_key_exists('token', $_SESSION)) {
1967                 $_SESSION['token'] = common_good_rand(64);
1968         }
1969         return $_SESSION['token'];
1970 }
1971
1972 function common_disfavor_form($notice) {
1973         common_element_start('form', array('id' => 'disfavor-' . $notice->id,
1974                                                                            'method' => 'post',
1975                                                                            'class' => 'disfavor',
1976                                                                            'action' => common_local_url('disfavor')));
1977
1978         common_element('input', array('type' => 'hidden',
1979                                                                   'name' => 'token-'. $notice->id,
1980                                                                   'id' => 'token-'. $notice->id,
1981                                                                   'class' => 'token',
1982                                                                   'value' => common_session_token()));
1983
1984         common_element('input', array('type' => 'hidden',
1985                                                                   'name' => 'notice',
1986                                                                   'id' => 'notice-n'. $notice->id,
1987                                                                   'class' => 'notice',
1988                                                                   'value' => $notice->id));
1989
1990         common_element('input', array('type' => 'submit',
1991                                                                   'id' => 'disfavor-submit-' . $notice->id,
1992                                                                   'name' => 'disfavor-submit-' . $notice->id,
1993                                                                   'class' => 'disfavor',
1994                                                                   'value' => 'Disfavor favorite',
1995                                                                   'title' => 'Remove this message from favorites'));
1996         common_element_end('form');
1997 }
1998
1999 function common_favor_form($notice) {
2000         common_element_start('form', array('id' => 'favor-' . $notice->id,
2001                                                                            'method' => 'post',
2002                                                                            'class' => 'favor',
2003                                                                            'action' => common_local_url('favor')));
2004
2005         common_element('input', array('type' => 'hidden',
2006                                                                   'name' => 'token-'. $notice->id,
2007                                                                   'id' => 'token-'. $notice->id,
2008                                                                   'class' => 'token',
2009                                                                   'value' => common_session_token()));
2010
2011         common_element('input', array('type' => 'hidden',
2012                                                                   'name' => 'notice',
2013                                                                   'id' => 'notice-n'. $notice->id,
2014                                                                   'class' => 'notice',
2015                                                                   'value' => $notice->id));
2016
2017         common_element('input', array('type' => 'submit',
2018                                                                   'id' => 'favor-submit-' . $notice->id,
2019                                                                   'name' => 'favor-submit-' . $notice->id,
2020                                                                   'class' => 'favor',
2021                                                                   'value' => 'Add to favorites',
2022                                                                   'title' => 'Add this message to favorites'));
2023         common_element_end('form');
2024 }
2025
2026 function common_nudge_form($profile) {
2027         common_element_start('form', array('id' => 'nudge', 'method' => 'post',
2028                                                                            'action' => common_local_url('nudge', array('nickname' => $profile->nickname))));
2029         common_hidden('token', common_session_token());
2030         common_element('input', array('type' => 'submit',
2031                                                                   'class' => 'submit',
2032                                                                   'value' => _('Send a nudge')));
2033         common_element_end('form');
2034 }
2035 function common_nudge_response() {
2036         common_element('p', array('id' => 'nudge_response'), _('Nudge sent!'));
2037 }
2038
2039 function common_subscribe_form($profile) {
2040         common_element_start('form', array('id' => 'subscribe-' . $profile->nickname,
2041                                                                            'method' => 'post',
2042                                                                            'class' => 'subscribe',
2043                                                                            'action' => common_local_url('subscribe')));
2044         common_hidden('token', common_session_token());
2045         common_element('input', array('id' => 'subscribeto-' . $profile->nickname,
2046                                                                   'name' => 'subscribeto',
2047                                                                   'type' => 'hidden',
2048                                                                   'value' => $profile->nickname));
2049         common_element('input', array('type' => 'submit',
2050                                                                   'class' => 'submit',
2051                                                                   'value' => _('Subscribe')));
2052         common_element_end('form');
2053 }
2054
2055 function common_unsubscribe_form($profile) {
2056         common_element_start('form', array('id' => 'unsubscribe-' . $profile->nickname,
2057                                                                            'method' => 'post',
2058                                                                            'class' => 'unsubscribe',
2059                                                                            'action' => common_local_url('unsubscribe')));
2060         common_hidden('token', common_session_token());
2061         common_element('input', array('id' => 'unsubscribeto-' . $profile->nickname,
2062                                                                   'name' => 'unsubscribeto',
2063                                                                   'type' => 'hidden',
2064                                                                   'value' => $profile->nickname));
2065         common_element('input', array('type' => 'submit',
2066                                                                   'class' => 'submit',
2067                                                                   'value' => _('Unsubscribe')));
2068         common_element_end('form');
2069 }
2070
2071 // XXX: Refactor this code
2072 function common_profile_new_message_nudge ($cur, $profile) {
2073         $user = User::staticGet('id', $profile->id);
2074
2075         if ($cur && $cur->id != $user->id && $cur->mutuallySubscribed($user)) {
2076         common_element_start('li', array('id' => 'profile_send_a_new_message'));
2077                 common_element('a', array('href' => common_local_url('newmessage', array('to' => $user->id))),
2078                                            _('Send a message'));
2079         common_element_end('li');
2080
2081             if ($user->email && $user->emailnotifynudge) {
2082             common_element_start('li', array('id' => 'profile_nudge'));
2083             common_nudge_form($user);
2084             common_element_end('li');
2085         }
2086         }
2087 }
2088
2089 function common_cache_key($extra) {
2090         return 'laconica:' . common_keyize(common_config('site', 'name')) . ':' . $extra;
2091 }
2092
2093 function common_keyize($str) {
2094         $str = strtolower($str);
2095         $str = preg_replace('/\s/', '_', $str);
2096         return $str;
2097 }
2098
2099 function common_message_form($content, $user, $to) {
2100
2101         common_element_start('form', array('id' => 'message_form',
2102                                                                            'method' => 'post',
2103                                                                            'action' => common_local_url('newmessage')));
2104
2105         $mutual_users = $user->mutuallySubscribedUsers();
2106
2107         $mutual = array();
2108
2109         while ($mutual_users->fetch()) {
2110                 if ($mutual_users->id != $user->id) {
2111                         $mutual[$mutual_users->id] = $mutual_users->nickname;
2112                 }
2113         }
2114
2115         $mutual_users->free();
2116         unset($mutual_users);
2117
2118         common_dropdown('to', _('To'), $mutual, NULL, FALSE, $to->id);
2119
2120         common_element_start('p');
2121
2122         common_element('textarea', array('id' => 'message_content',
2123                                                                          'cols' => 60,
2124                                                                          'rows' => 3,
2125                                                                          'name' => 'content'),
2126                                    ($content) ? $content : '');
2127
2128         common_element('input', array('id' => 'message_send',
2129                                                                   'name' => 'message_send',
2130                                                                   'type' => 'submit',
2131                                                                   'value' => _('Send')));
2132
2133         common_hidden('token', common_session_token());
2134
2135         common_element_end('p');
2136         common_element_end('form');
2137 }
2138
2139 function common_memcache() {
2140         static $cache = NULL;
2141         if (!common_config('memcached', 'enabled')) {
2142                 return NULL;
2143         } else {
2144                 if (!$cache) {
2145                         $cache = new Memcache();
2146                         $servers = common_config('memcached', 'server');
2147                         if (is_array($servers)) {
2148                                 foreach($servers as $server) {
2149                                         $cache->addServer($server);
2150                                 }
2151                         } else {
2152                                 $cache->addServer($servers);
2153                         }
2154                 }
2155                 return $cache;
2156         }
2157 }
2158
2159 function common_compatible_license($from, $to) {
2160         # XXX: better compatibility check needed here!
2161         return ($from == $to);
2162 }