index.php

   1 <?php
   2 /**
   3  * Shaarli v0.8.0 - Shaare your links...
   4  *
   5  * The personal, minimalist, super-fast, database free, bookmarking service.
   6  *
   7  * Friendly fork by the Shaarli community:
   8  *  - https://github.com/shaarli/Shaarli
   9  *
  10  * Original project by sebsauvage.net:
  11  *  - http://sebsauvage.net/wiki/doku.php?id=php:shaarli
  12  *  - https://github.com/sebsauvage/Shaarli
  13  *
  14  * Licence: http://www.opensource.org/licenses/zlib-license.php
  15  *
  16  * Requires: PHP 5.3.x
  17  */
  18
  19 // Set 'UTC' as the default timezone if it is not defined in php.ini
  20 // See http://php.net/manual/en/datetime.configuration.php#ini.date.timezone
  21 if (date_default_timezone_get() == '') {
  22     date_default_timezone_set('UTC');
  23 }
  24
  25 /*
  26  * PHP configuration
  27  */
  28 define('shaarli_version', '0.8.0');
  29
  30 // http://server.com/x/shaarli --> /shaarli/
  31 define('WEB_PATH', substr($_SERVER['REQUEST_URI'], 0, 1+strrpos($_SERVER['REQUEST_URI'], '/', 0)));
  32
  33 // High execution time in case of problematic imports/exports.
  34 ini_set('max_input_time','60');
  35
  36 // Try to set max upload file size and read
  37 ini_set('memory_limit', '128M');
  38 ini_set('post_max_size', '16M');
  39 ini_set('upload_max_filesize', '16M');
  40
  41 // See all error except warnings
  42 error_reporting(E_ALL^E_WARNING);
  43 // See all errors (for debugging only)
  44 //error_reporting(-1);
  45
  46
  47 // 3rd-party libraries
  48 if (! file_exists(__DIR__ . '/vendor/autoload.php')) {
  49     header('Content-Type: text/plain; charset=utf-8');
  50     echo "Error: missing Composer configuration\n\n"
  51         ."If you installed Shaarli through Git or using the development branch,\n"
  52         ."please refer to the installation documentation to install PHP"
  53         ." dependencies using Composer:\n"
  54         ."- https://github.com/shaarli/Shaarli/wiki/Server-requirements\n"
  55         ."- https://github.com/shaarli/Shaarli/wiki/Download-and-Installation";
  56     exit;
  57 }
  58 require_once 'inc/rain.tpl.class.php';
  59 require_once __DIR__ . '/vendor/autoload.php';
  60
  61 // Shaarli library
  62 require_once 'application/ApplicationUtils.php';
  63 require_once 'application/Cache.php';
  64 require_once 'application/CachedPage.php';
  65 require_once 'application/config/ConfigManager.php';
  66 require_once 'application/config/ConfigPlugin.php';
  67 require_once 'application/FeedBuilder.php';
  68 require_once 'application/FileUtils.php';
  69 require_once 'application/HttpUtils.php';
  70 require_once 'application/Languages.php';
  71 require_once 'application/LinkDB.php';
  72 require_once 'application/LinkFilter.php';
  73 require_once 'application/LinkUtils.php';
  74 require_once 'application/NetscapeBookmarkUtils.php';
  75 require_once 'application/PageBuilder.php';
  76 require_once 'application/TimeZone.php';
  77 require_once 'application/Url.php';
  78 require_once 'application/Utils.php';
  79 require_once 'application/PluginManager.php';
  80 require_once 'application/Router.php';
  81 require_once 'application/Updater.php';
  82
  83 // Ensure the PHP version is supported
  84 try {
  85     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
  86 } catch(Exception $exc) {
  87     header('Content-Type: text/plain; charset=utf-8');
  88     echo $exc->getMessage();
  89     exit;
  90 }
  91
  92 // Force cookie path (but do not change lifetime)
  93 $cookie = session_get_cookie_params();
  94 $cookiedir = '';
  95 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
  96     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
  97 }
  98 // Set default cookie expiration and path.
  99 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 100 // Set session parameters on server side.
 101 // If the user does not access any page within this time, his/her session is considered expired.
 102 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 103 // Use cookies to store session.
 104 ini_set('session.use_cookies', 1);
 105 // Force cookies for session (phpsessionID forbidden in URL).
 106 ini_set('session.use_only_cookies', 1);
 107 // Prevent PHP form using sessionID in URL if cookies are disabled.
 108 ini_set('session.use_trans_sid', false);
 109
 110 session_name('shaarli');
 111 // Start session if needed (Some server auto-start sessions).
 112 if (session_id() == '') {
 113     session_start();
 114 }
 115
 116 // Regenerate session ID if invalid or not defined in cookie.
 117 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 118     session_regenerate_id(true);
 119     $_COOKIE['shaarli'] = session_id();
 120 }
 121
 122 $conf = new ConfigManager();
 123 $conf->setEmpty('general.timezone', date_default_timezone_get());
 124 $conf->setEmpty('general.title', 'Shared links on '. escape(index_url($_SERVER)));
 125 RainTPL::$tpl_dir = $conf->get('resource.raintpl_tpl'); // template directory
 126 RainTPL::$cache_dir = $conf->get('resource.raintpl_tmp'); // cache directory
 127
 128 $pluginManager = new PluginManager($conf);
 129 $pluginManager->load($conf->get('general.enabled_plugins'));
 130
 131 date_default_timezone_set($conf->get('general.timezone', 'UTC'));
 132
 133 ob_start();  // Output buffering for the page cache.
 134
 135 // In case stupid admin has left magic_quotes enabled in php.ini:
 136 if (get_magic_quotes_gpc())
 137 {
 138     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 139     $_POST = array_map('stripslashes_deep', $_POST);
 140     $_GET = array_map('stripslashes_deep', $_GET);
 141     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 142 }
 143
 144 // Prevent caching on client side or proxy: (yes, it's ugly)
 145 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 146 header("Cache-Control: no-store, no-cache, must-revalidate");
 147 header("Cache-Control: post-check=0, pre-check=0", false);
 148 header("Pragma: no-cache");
 149
 150 if (! is_file($conf->getConfigFileExt())) {
 151     // Ensure Shaarli has proper access to its resources
 152     $errors = ApplicationUtils::checkResourcePermissions($conf);
 153
 154     if ($errors != array()) {
 155         $message = '<p>Insufficient permissions:</p><ul>';
 156
 157         foreach ($errors as $error) {
 158             $message .= '<li>'.$error.'</li>';
 159         }
 160         $message .= '</ul>';
 161
 162         header('Content-Type: text/html; charset=utf-8');
 163         echo $message;
 164         exit;
 165     }
 166
 167     // Display the installation form if no existing config is found
 168     install($conf);
 169 }
 170
 171 // a token depending of deployment salt, user password, and the current ip
 172 define('STAY_SIGNED_IN_TOKEN', sha1($conf->get('credentials.hash') . $_SERVER['REMOTE_ADDR'] . $conf->get('credentials.salt')));
 173
 174 // Sniff browser language and set date format accordingly.
 175 if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
 176     autoLocale($_SERVER['HTTP_ACCEPT_LANGUAGE']);
 177 }
 178 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 179
 180 /**
 181  * Checking session state (i.e. is the user still logged in)
 182  *
 183  * @param ConfigManager $conf The configuration manager.
 184  *
 185  * @return bool: true if the user is logged in, false otherwise.
 186  */
 187 function setup_login_state($conf)
 188 {
 189         if ($conf->get('security.open_shaarli')) {
 190             return true;
 191         }
 192         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 193         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 194         if (! $conf->exists('credentials.login')) {
 195             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 196             $loginFailure = true;
 197         }
 198         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 199             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 200             !$loginFailure)
 201         {
 202             fillSessionInfo($conf);
 203             $userIsLoggedIn = true;
 204         }
 205         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 206         if (empty($_SESSION['uid'])
 207         || ($conf->get('security.session_protection_disabled') == false && $_SESSION['ip'] != allIPs())
 208         || time() >= $_SESSION['expires_on'])
 209         {
 210             logout();
 211             $userIsLoggedIn = false;
 212             $loginFailure = true;
 213         }
 214         if (!empty($_SESSION['longlastingsession'])) {
 215             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 216         }
 217         else {
 218             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 219         }
 220         if (!$loginFailure) {
 221             $userIsLoggedIn = true;
 222         }
 223
 224         return $userIsLoggedIn;
 225 }
 226 $userIsLoggedIn = setup_login_state($conf);
 227
 228 /**
 229  * PubSubHubbub protocol support (if enabled)  [UNTESTED]
 230  * (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 231  *
 232  * @param ConfigManager $conf Configuration Manager instance.
 233  */
 234 function pubsubhub($conf)
 235 {
 236     $pshUrl = $conf->get('config.PUBSUBHUB_URL');
 237     if (!empty($pshUrl))
 238     {
 239         include_once './publisher.php';
 240         $p = new Publisher($pshUrl);
 241         $topic_url = array (
 242             index_url($_SERVER).'?do=atom',
 243             index_url($_SERVER).'?do=rss'
 244         );
 245         $p->publish_update($topic_url);
 246     }
 247 }
 248
 249 // ------------------------------------------------------------------------------------------
 250 // Session management
 251
 252 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 253 function allIPs()
 254 {
 255     $ip = $_SERVER['REMOTE_ADDR'];
 256     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 257     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 258     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 259     return $ip;
 260 }
 261
 262 /**
 263  * Load user session.
 264  *
 265  * @param ConfigManager $conf Configuration Manager instance.
 266  */
 267 function fillSessionInfo($conf)
 268 {
 269         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 270         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 271         $_SESSION['username']= $conf->get('credentials.login');
 272         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 273 }
 274
 275 /**
 276  * Check that user/password is correct.
 277  *
 278  * @param string        $login    Username
 279  * @param string        $password User password
 280  * @param ConfigManager $conf     Configuration Manager instance.
 281  *
 282  * @return bool: authentication successful or not.
 283  */
 284 function check_auth($login, $password, $conf)
 285 {
 286     $hash = sha1($password . $login . $conf->get('credentials.salt'));
 287     if ($login == $conf->get('credentials.login') && $hash == $conf->get('credentials.hash'))
 288     {   // Login/password is correct.
 289                 fillSessionInfo($conf);
 290         logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Login successful');
 291         return true;
 292     }
 293     logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Login failed for user '.$login);
 294     return false;
 295 }
 296
 297 // Returns true if the user is logged in.
 298 function isLoggedIn()
 299 {
 300     global $userIsLoggedIn;
 301     return $userIsLoggedIn;
 302 }
 303
 304 // Force logout.
 305 function logout() {
 306     if (isset($_SESSION)) {
 307         unset($_SESSION['uid']);
 308         unset($_SESSION['ip']);
 309         unset($_SESSION['username']);
 310         unset($_SESSION['privateonly']);
 311     }
 312     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 313 }
 314
 315
 316 // ------------------------------------------------------------------------------------------
 317 // Brute force protection system
 318 // Several consecutive failed logins will ban the IP address for 30 minutes.
 319 if (!is_file($conf->get('resource.ban_file', 'data/ipbans.php'))) {
 320     // FIXME! globals
 321     file_put_contents(
 322         $conf->get('resource.ban_file', 'data/ipbans.php'),
 323         "<?php\n\$GLOBALS['IPBANS']=".var_export(array('FAILURES'=>array(),'BANS'=>array()),true).";\n?>"
 324     );
 325 }
 326 include $conf->get('resource.ban_file', 'data/ipbans.php');
 327 /**
 328  * Signal a failed login. Will ban the IP if too many failures:
 329  *
 330  * @param ConfigManager $conf Configuration Manager instance.
 331  */
 332 function ban_loginFailed($conf)
 333 {
 334     $ip = $_SERVER['REMOTE_ADDR'];
 335     $trusted = $conf->get('security.trusted_proxies', array());
 336     if (in_array($ip, $trusted)) {
 337         $ip = getIpAddressFromProxy($_SERVER, $trusted);
 338         if (!$ip) {
 339             return;
 340         }
 341     }
 342     $gb = $GLOBALS['IPBANS'];
 343     if (! isset($gb['FAILURES'][$ip])) {
 344         $gb['FAILURES'][$ip]=0;
 345     }
 346     $gb['FAILURES'][$ip]++;
 347     if ($gb['FAILURES'][$ip] > ($conf->get('security.ban_after') - 1))
 348     {
 349         $gb['BANS'][$ip] = time() + $conf->get('security.ban_after', 1800);
 350         logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'IP address banned from login');
 351     }
 352     $GLOBALS['IPBANS'] = $gb;
 353     file_put_contents(
 354         $conf->get('resource.ban_file', 'data/ipbans.php'),
 355         "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 356     );
 357 }
 358
 359 /**
 360  * Signals a successful login. Resets failed login counter.
 361  *
 362  * @param ConfigManager $conf Configuration Manager instance.
 363  */
 364 function ban_loginOk($conf)
 365 {
 366     $ip = $_SERVER['REMOTE_ADDR'];
 367     $gb = $GLOBALS['IPBANS'];
 368     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 369     $GLOBALS['IPBANS'] = $gb;
 370     file_put_contents(
 371         $conf->get('resource.ban_file', 'data/ipbans.php'),
 372         "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 373     );
 374 }
 375
 376 /**
 377  * Checks if the user CAN login. If 'true', the user can try to login.
 378  *
 379  * @param ConfigManager $conf Configuration Manager instance.
 380  *
 381  * @return bool: true if the user is allowed to login.
 382  */
 383 function ban_canLogin($conf)
 384 {
 385     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 386     if (isset($gb['BANS'][$ip]))
 387     {
 388         // User is banned. Check if the ban has expired:
 389         if ($gb['BANS'][$ip]<=time())
 390         {   // Ban expired, user can try to login again.
 391             logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Ban lifted.');
 392             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 393             file_put_contents(
 394                 $conf->get('resource.ban_file', 'data/ipbans.php'),
 395                 "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 396             );
 397             return true; // Ban has expired, user can login.
 398         }
 399         return false; // User is banned.
 400     }
 401     return true; // User is not banned.
 402 }
 403
 404 // ------------------------------------------------------------------------------------------
 405 // Process login form: Check if login/password is correct.
 406 if (isset($_POST['login']))
 407 {
 408     if (!ban_canLogin($conf)) die('I said: NO. You are banned for the moment. Go away.');
 409     if (isset($_POST['password'])
 410         && tokenOk($_POST['token'])
 411         && (check_auth($_POST['login'], $_POST['password'], $conf))
 412     ) {   // Login/password is OK.
 413         ban_loginOk($conf);
 414         // If user wants to keep the session cookie even after the browser closes:
 415         if (!empty($_POST['longlastingsession']))
 416         {
 417                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 418             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 419             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 420
 421             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 422             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 423             // Note: Never forget the trailing slash on the cookie path!
 424             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 425         }
 426         else // Standard session expiration (=when browser closes)
 427         {
 428             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 429             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 430             session_regenerate_id(true);
 431         }
 432
 433         // Optional redirect after login:
 434         if (isset($_GET['post'])) {
 435             $uri = '?post='. urlencode($_GET['post']);
 436             foreach (array('description', 'source', 'title') as $param) {
 437                 if (!empty($_GET[$param])) {
 438                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 439                 }
 440             }
 441             header('Location: '. $uri);
 442             exit;
 443         }
 444
 445         if (isset($_GET['edit_link'])) {
 446             header('Location: ?edit_link='. escape($_GET['edit_link']));
 447             exit;
 448         }
 449
 450         if (isset($_POST['returnurl'])) {
 451             // Prevent loops over login screen.
 452             if (strpos($_POST['returnurl'], 'do=login') === false) {
 453                 header('Location: '. generateLocation($_POST['returnurl'], $_SERVER['HTTP_HOST']));
 454                 exit;
 455             }
 456         }
 457         header('Location: ?'); exit;
 458     }
 459     else
 460     {
 461         ban_loginFailed($conf);
 462         $redir = '&username='. $_POST['login'];
 463         if (isset($_GET['post'])) {
 464             $redir .= '&post=' . urlencode($_GET['post']);
 465             foreach (array('description', 'source', 'title') as $param) {
 466                 if (!empty($_GET[$param])) {
 467                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 468                 }
 469             }
 470         }
 471         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 472         exit;
 473     }
 474 }
 475
 476 // ------------------------------------------------------------------------------------------
 477 // Misc utility functions:
 478
 479 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 480 function return_bytes($val)
 481 {
 482     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 483     switch($last)
 484     {
 485         case 'g': $val *= 1024;
 486         case 'm': $val *= 1024;
 487         case 'k': $val *= 1024;
 488     }
 489     return $val;
 490 }
 491
 492 // Try to determine max file size for uploads (POST).
 493 // Returns an integer (in bytes)
 494 function getMaxFileSize()
 495 {
 496     $size1 = return_bytes(ini_get('post_max_size'));
 497     $size2 = return_bytes(ini_get('upload_max_filesize'));
 498     // Return the smaller of two:
 499     $maxsize = min($size1,$size2);
 500     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 501     return $maxsize;
 502 }
 503
 504 // ------------------------------------------------------------------------------------------
 505 // Token management for XSRF protection
 506 // Token should be used in any form which acts on data (create,update,delete,import...).
 507 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 508
 509 /**
 510  * Returns a token.
 511  *
 512  * @param ConfigManager $conf Configuration Manager instance.
 513  *
 514  * @return string token.
 515  */
 516 function getToken($conf)
 517 {
 518     $rnd = sha1(uniqid('', true) .'_'. mt_rand() . $conf->get('credentials.salt'));  // We generate a random string.
 519     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 520     return $rnd;
 521 }
 522
 523 // Tells if a token is OK. Using this function will destroy the token.
 524 // true=token is OK.
 525 function tokenOk($token)
 526 {
 527     if (isset($_SESSION['tokens'][$token]))
 528     {
 529         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 530         return true; // Token is OK.
 531     }
 532     return false; // Wrong token, or already used.
 533 }
 534
 535 /**
 536  * Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 537  * Gives the last 7 days (which have links).
 538  * This RSS feed cannot be filtered.
 539  *
 540  * @param ConfigManager $conf Configuration Manager instance.
 541  */
 542 function showDailyRSS($conf) {
 543     // Cache system
 544     $query = $_SERVER['QUERY_STRING'];
 545     $cache = new CachedPage(
 546         $conf->get('config.PAGE_CACHE'),
 547         page_url($_SERVER),
 548         startsWith($query,'do=dailyrss') && !isLoggedIn()
 549     );
 550     $cached = $cache->cachedVersion();
 551     if (!empty($cached)) {
 552         echo $cached;
 553         exit;
 554     }
 555
 556     // If cached was not found (or not usable), then read the database and build the response:
 557     // Read links from database (and filter private links if used it not logged in).
 558     $LINKSDB = new LinkDB(
 559         $conf->get('resource.datastore'),
 560         isLoggedIn(),
 561         $conf->get('privacy.hide_public_links'),
 562         $conf->get('redirector.url'),
 563         $conf->get('redirector.encode_url')
 564     );
 565
 566     /* Some Shaarlies may have very few links, so we need to look
 567        back in time (rsort()) until we have enough days ($nb_of_days).
 568     */
 569     $linkdates = array();
 570     foreach ($LINKSDB as $linkdate => $value) {
 571         $linkdates[] = $linkdate;
 572     }
 573     rsort($linkdates);
 574     $nb_of_days = 7; // We take 7 days.
 575     $today = date('Ymd');
 576     $days = array();
 577
 578     foreach ($linkdates as $linkdate) {
 579         $day = substr($linkdate, 0, 8); // Extract day (without time)
 580         if (strcmp($day,$today) < 0) {
 581             if (empty($days[$day])) {
 582                 $days[$day] = array();
 583             }
 584             $days[$day][] = $linkdate;
 585         }
 586
 587         if (count($days) > $nb_of_days) {
 588             break; // Have we collected enough days?
 589         }
 590     }
 591
 592     // Build the RSS feed.
 593     header('Content-Type: application/rss+xml; charset=utf-8');
 594     $pageaddr = escape(index_url($_SERVER));
 595     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 596     echo '<channel>';
 597     echo '<title>Daily - '. $conf->get('general.title') . '</title>';
 598     echo '<link>'. $pageaddr .'</link>';
 599     echo '<description>Daily shared links</description>';
 600     echo '<language>en-en</language>';
 601     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 602
 603     // For each day.
 604     foreach ($days as $day => $linkdates) {
 605         $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 606         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 607
 608         // Build the HTML body of this RSS entry.
 609         $html = '';
 610         $href = '';
 611         $links = array();
 612
 613         // We pre-format some fields for proper output.
 614         foreach ($linkdates as $linkdate) {
 615             $l = $LINKSDB[$linkdate];
 616             $l['formatedDescription'] = format_description($l['description'], $conf->get('redirector.url'));
 617             $l['thumbnail'] = thumbnail($conf, $l['url']);
 618             $l_date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $l['linkdate']);
 619             $l['timestamp'] = $l_date->getTimestamp();
 620             if (startsWith($l['url'], '?')) {
 621                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 622             }
 623             $links[$linkdate] = $l;
 624         }
 625
 626         // Then build the HTML for this day:
 627         $tpl = new RainTPL;
 628         $tpl->assign('title', $conf->get('general.title'));
 629         $tpl->assign('daydate', $dayDate->getTimestamp());
 630         $tpl->assign('absurl', $absurl);
 631         $tpl->assign('links', $links);
 632         $tpl->assign('rssdate', escape($dayDate->format(DateTime::RSS)));
 633         $tpl->assign('hide_timestamps', $conf->get('privacy.hide_timestamps', false));
 634         $html = $tpl->draw('dailyrss', $return_string=true);
 635
 636         echo $html . PHP_EOL;
 637     }
 638     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
 639
 640     $cache->cache(ob_get_contents());
 641     ob_end_flush();
 642     exit;
 643 }
 644
 645 /**
 646  * Show the 'Daily' page.
 647  *
 648  * @param PageBuilder   $pageBuilder   Template engine wrapper.
 649  * @param LinkDB        $LINKSDB       LinkDB instance.
 650  * @param ConfigManager $conf          Configuration Manager instance.
 651  * @param PluginManager $pluginManager Plugin Manager instane.
 652  */
 653 function showDaily($pageBuilder, $LINKSDB, $conf, $pluginManager)
 654 {
 655     $day=date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 656     if (isset($_GET['day'])) $day=$_GET['day'];
 657
 658     $days = $LINKSDB->days();
 659     $i = array_search($day,$days);
 660     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
 661     $previousday='';
 662     $nextday='';
 663     if ($i!==false)
 664     {
 665         if ($i>=1) $previousday=$days[$i-1];
 666         if ($i<count($days)-1) $nextday=$days[$i+1];
 667     }
 668
 669     try {
 670         $linksToDisplay = $LINKSDB->filterDay($day);
 671     } catch (Exception $exc) {
 672         error_log($exc);
 673         $linksToDisplay = array();
 674     }
 675
 676     // We pre-format some fields for proper output.
 677     foreach($linksToDisplay as $key=>$link)
 678     {
 679
 680         $taglist = explode(' ',$link['tags']);
 681         uasort($taglist, 'strcasecmp');
 682         $linksToDisplay[$key]['taglist']=$taglist;
 683         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $conf->get('redirector.url'));
 684         $linksToDisplay[$key]['thumbnail'] = thumbnail($conf, $link['url']);
 685         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
 686         $linksToDisplay[$key]['timestamp'] = $date->getTimestamp();
 687     }
 688
 689     /* We need to spread the articles on 3 columns.
 690        I did not want to use a JavaScript lib like http://masonry.desandro.com/
 691        so I manually spread entries with a simple method: I roughly evaluate the
 692        height of a div according to title and description length.
 693     */
 694     $columns=array(array(),array(),array()); // Entries to display, for each column.
 695     $fill=array(0,0,0);  // Rough estimate of columns fill.
 696     foreach($linksToDisplay as $key=>$link)
 697     {
 698         // Roughly estimate length of entry (by counting characters)
 699         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
 700         // Description: 836 characters gives roughly 342 pixel height.
 701         // This is not perfect, but it's usually OK.
 702         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
 703         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
 704         // Then put in column which is the less filled:
 705         $smallest=min($fill); // find smallest value in array.
 706         $index=array_search($smallest,$fill); // find index of this smallest value.
 707         array_push($columns[$index],$link); // Put entry in this column.
 708         $fill[$index]+=$length;
 709     }
 710
 711     $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 712     $data = array(
 713         'linksToDisplay' => $linksToDisplay,
 714         'cols' => $columns,
 715         'day' => $dayDate->getTimestamp(),
 716         'previousday' => $previousday,
 717         'nextday' => $nextday,
 718     );
 719
 720     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
 721
 722     foreach ($data as $key => $value) {
 723         $pageBuilder->assign($key, $value);
 724     }
 725
 726     $pageBuilder->renderPage('daily');
 727     exit;
 728 }
 729
 730 /**
 731  * Renders the linklist
 732  *
 733  * @param pageBuilder   $PAGE    pageBuilder instance.
 734  * @param LinkDB        $LINKSDB LinkDB instance.
 735  * @param ConfigManager $conf    Configuration Manager instance.
 736  * @param PluginManager $pluginManager Plugin Manager instance.
 737  */
 738 function showLinkList($PAGE, $LINKSDB, $conf, $pluginManager) {
 739     buildLinkList($PAGE,$LINKSDB, $conf, $pluginManager); // Compute list of links to display
 740     $PAGE->renderPage('linklist');
 741 }
 742
 743 /**
 744  * Render HTML page (according to URL parameters and user rights)
 745  *
 746  * @param ConfigManager $conf          Configuration Manager instance.
 747  * @param PluginManager $pluginManager Plugin Manager instance,
 748  */
 749 function renderPage($conf, $pluginManager)
 750 {
 751     $LINKSDB = new LinkDB(
 752         $conf->get('resource.datastore'),
 753         isLoggedIn(),
 754         $conf->get('privacy.hide_public_links'),
 755         $conf->get('redirector.url'),
 756         $conf->get('redirector.encode_url')
 757     );
 758
 759     $updater = new Updater(
 760         read_updates_file($conf->get('resource.updates')),
 761         $LINKSDB,
 762         $conf,
 763         isLoggedIn()
 764     );
 765     try {
 766         $newUpdates = $updater->update();
 767         if (! empty($newUpdates)) {
 768             write_updates_file(
 769                 $conf->get('resource.updates'),
 770                 $updater->getDoneUpdates()
 771             );
 772         }
 773     }
 774     catch(Exception $e) {
 775         die($e->getMessage());
 776     }
 777
 778     $PAGE = new PageBuilder($conf);
 779     $PAGE->assign('linkcount', count($LINKSDB));
 780     $PAGE->assign('privateLinkcount', count_private($LINKSDB));
 781
 782     // Determine which page will be rendered.
 783     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
 784     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
 785
 786     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
 787     // Then assign generated data to RainTPL.
 788     $common_hooks = array(
 789         'includes',
 790         'header',
 791         'footer',
 792     );
 793
 794     foreach($common_hooks as $name) {
 795         $plugin_data = array();
 796         $pluginManager->executeHooks('render_' . $name, $plugin_data,
 797             array(
 798                 'target' => $targetPage,
 799                 'loggedin' => isLoggedIn()
 800             )
 801         );
 802         $PAGE->assign('plugins_' . $name, $plugin_data);
 803     }
 804
 805     // -------- Display login form.
 806     if ($targetPage == Router::$PAGE_LOGIN)
 807     {
 808         if ($conf->get('security.open_shaarli')) { header('Location: ?'); exit; }  // No need to login for open Shaarli
 809         if (isset($_GET['username'])) {
 810             $PAGE->assign('username', escape($_GET['username']));
 811         }
 812         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
 813         $PAGE->renderPage('loginform');
 814         exit;
 815     }
 816     // -------- User wants to logout.
 817     if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=logout'))
 818     {
 819         invalidateCaches($conf->get('resource.page_cache'));
 820         logout();
 821         header('Location: ?');
 822         exit;
 823     }
 824
 825     // -------- Picture wall
 826     if ($targetPage == Router::$PAGE_PICWALL)
 827     {
 828         // Optionally filter the results:
 829         $links = $LINKSDB->filterSearch($_GET);
 830         $linksToDisplay = array();
 831
 832         // Get only links which have a thumbnail.
 833         foreach($links as $link)
 834         {
 835             $permalink='?'.escape(smallhash($link['linkdate']));
 836             $thumb=lazyThumbnail($conf, $link['url'],$permalink);
 837             if ($thumb!='') // Only output links which have a thumbnail.
 838             {
 839                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
 840                 $linksToDisplay[]=$link; // Add to array.
 841             }
 842         }
 843
 844         $data = array(
 845             'linksToDisplay' => $linksToDisplay,
 846         );
 847         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
 848
 849         foreach ($data as $key => $value) {
 850             $PAGE->assign($key, $value);
 851         }
 852
 853         $PAGE->renderPage('picwall');
 854         exit;
 855     }
 856
 857     // -------- Tag cloud
 858     if ($targetPage == Router::$PAGE_TAGCLOUD)
 859     {
 860         $tags= $LINKSDB->allTags();
 861
 862         // We sort tags alphabetically, then choose a font size according to count.
 863         // First, find max value.
 864         $maxcount = 0;
 865         foreach ($tags as $value) {
 866             $maxcount = max($maxcount, $value);
 867         }
 868
 869         // Sort tags alphabetically: case insensitive, support locale if avalaible.
 870         uksort($tags, function($a, $b) {
 871             // Collator is part of PHP intl.
 872             if (class_exists('Collator')) {
 873                 $c = new Collator(setlocale(LC_COLLATE, 0));
 874                 if (!intl_is_failure(intl_get_error_code())) {
 875                     return $c->compare($a, $b);
 876                 }
 877             }
 878             return strcasecmp($a, $b);
 879         });
 880
 881         $tagList = array();
 882         foreach($tags as $key => $value) {
 883             // Tag font size scaling:
 884             //   default 15 and 30 logarithm bases affect scaling,
 885             //   22 and 6 are arbitrary font sizes for max and min sizes.
 886             $size = log($value, 15) / log($maxcount, 30) * 2.2 + 0.8;
 887             $tagList[$key] = array(
 888                 'count' => $value,
 889                 'size' => number_format($size, 2, '.', ''),
 890             );
 891         }
 892
 893         $data = array(
 894             'tags' => $tagList,
 895         );
 896         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
 897
 898         foreach ($data as $key => $value) {
 899             $PAGE->assign($key, $value);
 900         }
 901
 902         $PAGE->renderPage('tagcloud');
 903         exit;
 904     }
 905
 906     // Daily page.
 907     if ($targetPage == Router::$PAGE_DAILY) {
 908         showDaily($PAGE, $LINKSDB, $conf, $pluginManager);
 909     }
 910
 911     // ATOM and RSS feed.
 912     if ($targetPage == Router::$PAGE_FEED_ATOM || $targetPage == Router::$PAGE_FEED_RSS) {
 913         $feedType = $targetPage == Router::$PAGE_FEED_RSS ? FeedBuilder::$FEED_RSS : FeedBuilder::$FEED_ATOM;
 914         header('Content-Type: application/'. $feedType .'+xml; charset=utf-8');
 915
 916         // Cache system
 917         $query = $_SERVER['QUERY_STRING'];
 918         $cache = new CachedPage(
 919             $conf->get('resource.page_cache'),
 920             page_url($_SERVER),
 921             startsWith($query,'do='. $targetPage) && !isLoggedIn()
 922         );
 923         $cached = $cache->cachedVersion();
 924         if (!empty($cached)) {
 925             echo $cached;
 926             exit;
 927         }
 928
 929         // Generate data.
 930         $feedGenerator = new FeedBuilder($LINKSDB, $feedType, $_SERVER, $_GET, isLoggedIn());
 931         $feedGenerator->setLocale(strtolower(setlocale(LC_COLLATE, 0)));
 932         $feedGenerator->setHideDates($conf->get('privacy.hide_timestamps') && !isLoggedIn());
 933         $feedGenerator->setUsePermalinks(isset($_GET['permalinks']) || !$conf->get('feed.rss_permalinks'));
 934         $pshUrl = $conf->get('config.PUBSUBHUB_URL');
 935         if (!empty($pshUrl)) {
 936             $feedGenerator->setPubsubhubUrl($pshUrl);
 937         }
 938         $data = $feedGenerator->buildData();
 939
 940         // Process plugin hook.
 941         $pluginManager->executeHooks('render_feed', $data, array(
 942             'loggedin' => isLoggedIn(),
 943             'target' => $targetPage,
 944         ));
 945
 946         // Render the template.
 947         $PAGE->assignAll($data);
 948         $PAGE->renderPage('feed.'. $feedType);
 949         $cache->cache(ob_get_contents());
 950         ob_end_flush();
 951         exit;
 952     }
 953
 954     // Display openseach plugin (XML)
 955     if ($targetPage == Router::$PAGE_OPENSEARCH) {
 956         header('Content-Type: application/xml; charset=utf-8');
 957         $PAGE->assign('serverurl', index_url($_SERVER));
 958         $PAGE->renderPage('opensearch');
 959         exit;
 960     }
 961
 962     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
 963     if (isset($_GET['addtag']))
 964     {
 965         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
 966         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
 967         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
 968
 969         // Prevent redirection loop
 970         if (isset($params['addtag'])) {
 971             unset($params['addtag']);
 972         }
 973
 974         // Check if this tag is already in the search query and ignore it if it is.
 975         // Each tag is always separated by a space
 976         if (isset($params['searchtags'])) {
 977             $current_tags = explode(' ', $params['searchtags']);
 978         } else {
 979             $current_tags = array();
 980         }
 981         $addtag = true;
 982         foreach ($current_tags as $value) {
 983             if ($value === $_GET['addtag']) {
 984                 $addtag = false;
 985                 break;
 986             }
 987         }
 988         // Append the tag if necessary
 989         if (empty($params['searchtags'])) {
 990             $params['searchtags'] = trim($_GET['addtag']);
 991         }
 992         else if ($addtag) {
 993             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
 994         }
 995
 996         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
 997         header('Location: ?'.http_build_query($params));
 998         exit;
 999     }
1000
1001     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1002     if (isset($_GET['removetag'])) {
1003         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1004         if (empty($_SERVER['HTTP_REFERER'])) {
1005             header('Location: ?');
1006             exit;
1007         }
1008
1009         // In case browser does not send HTTP_REFERER
1010         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1011
1012         // Prevent redirection loop
1013         if (isset($params['removetag'])) {
1014             unset($params['removetag']);
1015         }
1016
1017         if (isset($params['searchtags'])) {
1018             $tags = explode(' ', $params['searchtags']);
1019             // Remove value from array $tags.
1020             $tags = array_diff($tags, array($_GET['removetag']));
1021             $params['searchtags'] = implode(' ',$tags);
1022
1023             if (empty($params['searchtags'])) {
1024                 unset($params['searchtags']);
1025             }
1026
1027             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1028         }
1029         header('Location: ?'.http_build_query($params));
1030         exit;
1031     }
1032
1033     // -------- User wants to change the number of links per page (linksperpage=...)
1034     if (isset($_GET['linksperpage'])) {
1035         if (is_numeric($_GET['linksperpage'])) {
1036             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1037         }
1038
1039         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1040         exit;
1041     }
1042
1043     // -------- User wants to see only private links (toggle)
1044     if (isset($_GET['privateonly'])) {
1045         if (empty($_SESSION['privateonly'])) {
1046             $_SESSION['privateonly'] = 1; // See only private links
1047         } else {
1048             unset($_SESSION['privateonly']); // See all links
1049         }
1050
1051         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1052         exit;
1053     }
1054
1055     // -------- Handle other actions allowed for non-logged in users:
1056     if (!isLoggedIn())
1057     {
1058         // User tries to post new link but is not logged in:
1059         // Show login screen, then redirect to ?post=...
1060         if (isset($_GET['post']))
1061         {
1062             header('Location: ?do=login&post='.urlencode($_GET['post']).(!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').(!empty($_GET['description'])?'&description='.urlencode($_GET['description']):'').(!empty($_GET['source'])?'&source='.urlencode($_GET['source']):'')); // Redirect to login page, then back to post link.
1063             exit;
1064         }
1065
1066         showLinkList($PAGE, $LINKSDB, $conf, $pluginManager);
1067         if (isset($_GET['edit_link'])) {
1068             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1069             exit;
1070         }
1071
1072         exit; // Never remove this one! All operations below are reserved for logged in user.
1073     }
1074
1075     // -------- All other functions are reserved for the registered user:
1076
1077     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1078     if ($targetPage == Router::$PAGE_TOOLS)
1079     {
1080         $data = array(
1081             'pageabsaddr' => index_url($_SERVER),
1082         );
1083         $pluginManager->executeHooks('render_tools', $data);
1084
1085         foreach ($data as $key => $value) {
1086             $PAGE->assign($key, $value);
1087         }
1088
1089         $PAGE->renderPage('tools');
1090         exit;
1091     }
1092
1093     // -------- User wants to change his/her password.
1094     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1095     {
1096         if ($conf->get('security.open_shaarli')) {
1097             die('You are not supposed to change a password on an Open Shaarli.');
1098         }
1099
1100         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1101         {
1102             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1103
1104             // Make sure old password is correct.
1105             $oldhash = sha1($_POST['oldpassword'].$conf->get('credentials.login').$conf->get('credentials.salt'));
1106             if ($oldhash!= $conf->get('credentials.hash')) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1107             // Save new password
1108             // Salt renders rainbow-tables attacks useless.
1109             $conf->set('credentials.salt', sha1(uniqid('', true) .'_'. mt_rand()));
1110             $conf->set('credentials.hash', sha1($_POST['setpassword'] . $conf->get('credentials.login') . $conf->get('credentials.salt')));
1111             try {
1112                 $conf->write(isLoggedIn());
1113             }
1114             catch(Exception $e) {
1115                 error_log(
1116                     'ERROR while writing config file after changing password.' . PHP_EOL .
1117                     $e->getMessage()
1118                 );
1119
1120                 // TODO: do not handle exceptions/errors in JS.
1121                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1122                 exit;
1123             }
1124             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1125             exit;
1126         }
1127         else // show the change password form.
1128         {
1129             $PAGE->renderPage('changepassword');
1130             exit;
1131         }
1132     }
1133
1134     // -------- User wants to change configuration
1135     if ($targetPage == Router::$PAGE_CONFIGURE)
1136     {
1137         if (!empty($_POST['title']) )
1138         {
1139             if (!tokenOk($_POST['token'])) {
1140                 die('Wrong token.'); // Go away!
1141             }
1142             $tz = 'UTC';
1143             if (!empty($_POST['continent']) && !empty($_POST['city'])
1144                 && isTimeZoneValid($_POST['continent'], $_POST['city'])
1145             ) {
1146                 $tz = $_POST['continent'] . '/' . $_POST['city'];
1147             }
1148             $conf->set('general.timezone', $tz);
1149             $conf->set('general.title', escape($_POST['title']));
1150             $conf->set('general.header_link', escape($_POST['titleLink']));
1151             $conf->set('redirector.url', escape($_POST['redirector']));
1152             $conf->set('security.session_protection_disabled', !empty($_POST['disablesessionprotection']));
1153             $conf->set('privacy.default_private_links', !empty($_POST['privateLinkByDefault']));
1154             $conf->set('feed.rss_permalinks', !empty($_POST['enableRssPermalinks']));
1155             $conf->set('updates.check_updates', !empty($_POST['updateCheck']));
1156             $conf->set('privacy.hide_public_links', !empty($_POST['hidePublicLinks']));
1157             try {
1158                 $conf->write(isLoggedIn());
1159             }
1160             catch(Exception $e) {
1161                 error_log(
1162                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1163                     $e->getMessage()
1164                 );
1165
1166                 // TODO: do not handle exceptions/errors in JS.
1167                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=configure\';</script>';
1168                 exit;
1169             }
1170             echo '<script>alert("Configuration was saved.");document.location=\'?do=configure\';</script>';
1171             exit;
1172         }
1173         else // Show the configuration form.
1174         {
1175             $PAGE->assign('title', $conf->get('general.title'));
1176             $PAGE->assign('redirector', $conf->get('redirector.url'));
1177             list($timezone_form, $timezone_js) = generateTimeZoneForm($conf->get('general.timezone'));
1178             $PAGE->assign('timezone_form', $timezone_form);
1179             $PAGE->assign('timezone_js',$timezone_js);
1180             $PAGE->assign('private_links_default', $conf->get('privacy.default_private_links', false));
1181             $PAGE->assign('session_protection_disabled', $conf->get('security.session_protection_disabled', false));
1182             $PAGE->assign('enable_rss_permalinks', $conf->get('feed.rss_permalinks', false));
1183             $PAGE->assign('enable_update_check', $conf->get('updates.check_updates', true));
1184             $PAGE->assign('hide_public_links', $conf->get('privacy.hide_public_links', false));
1185             $PAGE->renderPage('configure');
1186             exit;
1187         }
1188     }
1189
1190     // -------- User wants to rename a tag or delete it
1191     if ($targetPage == Router::$PAGE_CHANGETAG)
1192     {
1193         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1194             $PAGE->assign('tags', $LINKSDB->allTags());
1195             $PAGE->renderPage('changetag');
1196             exit;
1197         }
1198
1199         if (!tokenOk($_POST['token'])) {
1200             die('Wrong token.');
1201         }
1202
1203         // Delete a tag:
1204         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1205             $needle = trim($_POST['fromtag']);
1206             // True for case-sensitive tag search.
1207             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1208             foreach($linksToAlter as $key=>$value)
1209             {
1210                 $tags = explode(' ',trim($value['tags']));
1211                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1212                 $value['tags']=trim(implode(' ',$tags));
1213                 $LINKSDB[$key]=$value;
1214             }
1215             $LINKSDB->savedb($conf->get('resource.page_cache'));
1216             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1217             exit;
1218         }
1219
1220         // Rename a tag:
1221         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1222             $needle = trim($_POST['fromtag']);
1223             // True for case-sensitive tag search.
1224             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1225             foreach($linksToAlter as $key=>$value)
1226             {
1227                 $tags = explode(' ',trim($value['tags']));
1228                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1229                 $value['tags']=trim(implode(' ',$tags));
1230                 $LINKSDB[$key]=$value;
1231             }
1232             $LINKSDB->savedb($conf->get('resource.page_cache')); // Save to disk.
1233             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1234             exit;
1235         }
1236     }
1237
1238     // -------- User wants to add a link without using the bookmarklet: Show form.
1239     if ($targetPage == Router::$PAGE_ADDLINK)
1240     {
1241         $PAGE->renderPage('addlink');
1242         exit;
1243     }
1244
1245     // -------- User clicked the "Save" button when editing a link: Save link to database.
1246     if (isset($_POST['save_edit']))
1247     {
1248         $linkdate = $_POST['lf_linkdate'];
1249         $updated = isset($LINKSDB[$linkdate]) ? strval(date('Ymd_His')) : false;
1250
1251         // Go away!
1252         if (! tokenOk($_POST['token'])) {
1253             die('Wrong token.');
1254         }
1255         // Remove multiple spaces.
1256         $tags = trim(preg_replace('/\s\s+/', ' ', $_POST['lf_tags']));
1257         // Remove first '-' char in tags.
1258         $tags = preg_replace('/(^| )\-/', '$1', $tags);
1259         // Remove duplicates.
1260         $tags = implode(' ', array_unique(explode(' ', $tags)));
1261
1262         $url = trim($_POST['lf_url']);
1263         if (! startsWith($url, 'http:') && ! startsWith($url, 'https:')
1264             && ! startsWith($url, 'ftp:') && ! startsWith($url, 'magnet:')
1265             && ! startsWith($url, '?') && ! startsWith($url, 'javascript:')
1266         ) {
1267             $url = 'http://' . $url;
1268         }
1269
1270         $link = array(
1271             'title' => trim($_POST['lf_title']),
1272             'url' => $url,
1273             'description' => $_POST['lf_description'],
1274             'private' => (isset($_POST['lf_private']) ? 1 : 0),
1275             'linkdate' => $linkdate,
1276             'updated' => $updated,
1277             'tags' => str_replace(',', ' ', $tags)
1278         );
1279         // If title is empty, use the URL as title.
1280         if ($link['title'] == '') {
1281             $link['title'] = $link['url'];
1282         }
1283
1284         $pluginManager->executeHooks('save_link', $link);
1285
1286         $LINKSDB[$linkdate] = $link;
1287         $LINKSDB->savedb($conf->get('resource.page_cache'));
1288         pubsubhub($conf);
1289
1290         // If we are called from the bookmarklet, we must close the popup:
1291         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1292             echo '<script>self.close();</script>';
1293             exit;
1294         }
1295
1296         $returnurl = !empty($_POST['returnurl']) ? $_POST['returnurl'] : '?';
1297         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1298         // Scroll to the link which has been edited.
1299         $location .= '#' . smallHash($_POST['lf_linkdate']);
1300         // After saving the link, redirect to the page the user was on.
1301         header('Location: '. $location);
1302         exit;
1303     }
1304
1305     // -------- User clicked the "Cancel" button when editing a link.
1306     if (isset($_POST['cancel_edit']))
1307     {
1308         // If we are called from the bookmarklet, we must close the popup:
1309         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1310         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1311         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1312         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1313         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1314         exit;
1315     }
1316
1317     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1318     if (isset($_POST['delete_link']))
1319     {
1320         if (!tokenOk($_POST['token'])) die('Wrong token.');
1321         // We do not need to ask for confirmation:
1322         // - confirmation is handled by JavaScript
1323         // - we are protected from XSRF by the token.
1324         $linkdate=$_POST['lf_linkdate'];
1325
1326         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1327
1328         unset($LINKSDB[$linkdate]);
1329         $LINKSDB->savedb('resource.page_cache'); // save to disk
1330
1331         // If we are called from the bookmarklet, we must close the popup:
1332         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1333         // Pick where we're going to redirect
1334         // =============================================================
1335         // Basically, we can't redirect to where we were previously if it was a permalink
1336         // or an edit_link, because it would 404.
1337         // Cases:
1338         //    - /             : nothing in $_GET, redirect to self
1339         //    - /?page        : redirect to self
1340         //    - /?searchterm  : redirect to self (there might be other links)
1341         //    - /?searchtags  : redirect to self
1342         //    - /permalink    : redirect to / (the link does not exist anymore)
1343         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1344         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1345         // redirect is not satisfied, and only then redirect to /
1346         $location = "?";
1347         // Self redirection
1348         if (count($_GET) == 0
1349             || isset($_GET['page'])
1350             || isset($_GET['searchterm'])
1351             || isset($_GET['searchtags'])
1352         ) {
1353             if (isset($_POST['returnurl'])) {
1354                 $location = $_POST['returnurl']; // Handle redirects given by the form
1355             } else {
1356                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1357             }
1358         }
1359
1360         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1361         exit;
1362     }
1363
1364     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1365     if (isset($_GET['edit_link']))
1366     {
1367         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1368         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1369         $data = array(
1370             'link' => $link,
1371             'link_is_new' => false,
1372             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1373             'tags' => $LINKSDB->allTags(),
1374         );
1375         $pluginManager->executeHooks('render_editlink', $data);
1376
1377         foreach ($data as $key => $value) {
1378             $PAGE->assign($key, $value);
1379         }
1380
1381         $PAGE->renderPage('editlink');
1382         exit;
1383     }
1384
1385     // -------- User want to post a new link: Display link edit form.
1386     if (isset($_GET['post'])) {
1387         $url = cleanup_url($_GET['post']);
1388
1389         $link_is_new = false;
1390         // Check if URL is not already in database (in this case, we will edit the existing link)
1391         $link = $LINKSDB->getLinkFromUrl($url);
1392         if (!$link)
1393         {
1394             $link_is_new = true;
1395             $linkdate = strval(date('Ymd_His'));
1396             // Get title if it was provided in URL (by the bookmarklet).
1397             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1398             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1399             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1400             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1401             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1402             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1403             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1404                 // Short timeout to keep the application responsive
1405                 list($headers, $content) = get_http_response($url, 4);
1406                 if (strpos($headers[0], '200 OK') !== false) {
1407                     // Retrieve charset.
1408                     $charset = get_charset($headers, $content);
1409                     // Extract title.
1410                     $title = html_extract_title($content);
1411                     // Re-encode title in utf-8 if necessary.
1412                     if (! empty($title) && strtolower($charset) != 'utf-8') {
1413                         $title = mb_convert_encoding($title, 'utf-8', $charset);
1414                     }
1415                 }
1416             }
1417
1418             if ($url == '') {
1419                 $url = '?' . smallHash($linkdate);
1420                 $title = 'Note: ';
1421             }
1422             $url = escape($url);
1423             $title = escape($title);
1424
1425             $link = array(
1426                 'linkdate' => $linkdate,
1427                 'title' => $title,
1428                 'url' => $url,
1429                 'description' => $description,
1430                 'tags' => $tags,
1431                 'private' => $private
1432             );
1433         }
1434
1435         $data = array(
1436             'link' => $link,
1437             'link_is_new' => $link_is_new,
1438             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1439             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1440             'tags' => $LINKSDB->allTags(),
1441             'default_private_links' => $conf->get('privacy.default_private_links', false),
1442         );
1443         $pluginManager->executeHooks('render_editlink', $data);
1444
1445         foreach ($data as $key => $value) {
1446             $PAGE->assign($key, $value);
1447         }
1448
1449         $PAGE->renderPage('editlink');
1450         exit;
1451     }
1452
1453     if ($targetPage == Router::$PAGE_EXPORT) {
1454         // Export links as a Netscape Bookmarks file
1455
1456         if (empty($_GET['selection'])) {
1457             $PAGE->renderPage('export');
1458             exit;
1459         }
1460
1461         // export as bookmarks_(all|private|public)_YYYYmmdd_HHMMSS.html
1462         $selection = $_GET['selection'];
1463         if (isset($_GET['prepend_note_url'])) {
1464             $prependNoteUrl = $_GET['prepend_note_url'];
1465         } else {
1466             $prependNoteUrl = false;
1467         }
1468
1469         try {
1470             $PAGE->assign(
1471                 'links',
1472                 NetscapeBookmarkUtils::filterAndFormat(
1473                     $LINKSDB,
1474                     $selection,
1475                     $prependNoteUrl,
1476                     index_url($_SERVER)
1477                 )
1478             );
1479         } catch (Exception $exc) {
1480             header('Content-Type: text/plain; charset=utf-8');
1481             echo $exc->getMessage();
1482             exit;
1483         }
1484         $now = new DateTime();
1485         header('Content-Type: text/html; charset=utf-8');
1486         header(
1487             'Content-disposition: attachment; filename=bookmarks_'
1488            .$selection.'_'.$now->format(LinkDB::LINK_DATE_FORMAT).'.html'
1489         );
1490         $PAGE->assign('date', $now->format(DateTime::RFC822));
1491         $PAGE->assign('eol', PHP_EOL);
1492         $PAGE->assign('selection', $selection);
1493         $PAGE->renderPage('export.bookmarks');
1494         exit;
1495     }
1496
1497     if ($targetPage == Router::$PAGE_IMPORT) {
1498         // Upload a Netscape bookmark dump to import its contents
1499
1500         if (! isset($_POST['token']) || ! isset($_FILES['filetoupload'])) {
1501             // Show import dialog
1502             $PAGE->assign('maxfilesize', getMaxFileSize());
1503             $PAGE->renderPage('import');
1504             exit;
1505         }
1506
1507         // Import bookmarks from an uploaded file
1508         if (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size'] == 0) {
1509             // The file is too big or some form field may be missing.
1510             echo '<script>alert("The file you are trying to upload is probably'
1511                 .' bigger than what this webserver can accept ('
1512                 .getMaxFileSize().' bytes).'
1513                 .' Please upload in smaller chunks.");document.location=\'?do='
1514                 .Router::$PAGE_IMPORT .'\';</script>';
1515             exit;
1516         }
1517         if (! tokenOk($_POST['token'])) {
1518             die('Wrong token.');
1519         }
1520         $status = NetscapeBookmarkUtils::import(
1521             $_POST,
1522             $_FILES,
1523             $LINKSDB,
1524             $conf->get('resource.page_cache')
1525         );
1526         echo '<script>alert("'.$status.'");document.location=\'?do='
1527              .Router::$PAGE_IMPORT .'\';</script>';
1528         exit;
1529     }
1530
1531     // Plugin administration page
1532     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1533         $pluginMeta = $pluginManager->getPluginsMeta();
1534
1535         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1536         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1537         // Load parameters.
1538         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $conf->get('plugins', array()));
1539         uasort(
1540             $enabledPlugins,
1541             function($a, $b) { return $a['order'] - $b['order']; }
1542         );
1543         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1544
1545         $PAGE->assign('enabledPlugins', $enabledPlugins);
1546         $PAGE->assign('disabledPlugins', $disabledPlugins);
1547         $PAGE->renderPage('pluginsadmin');
1548         exit;
1549     }
1550
1551     // Plugin administration form action
1552     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1553         try {
1554             if (isset($_POST['parameters_form'])) {
1555                 unset($_POST['parameters_form']);
1556                 foreach ($_POST as $param => $value) {
1557                     $conf->set('plugins.'. $param, escape($value));
1558                 }
1559             }
1560             else {
1561                 $conf->set('general.enabled_plugins', save_plugin_config($_POST));
1562             }
1563             $conf->write(isLoggedIn());
1564         }
1565         catch (Exception $e) {
1566             error_log(
1567                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1568                 $e->getMessage()
1569             );
1570
1571             // TODO: do not handle exceptions/errors in JS.
1572             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do='. Router::$PAGE_PLUGINSADMIN .'\';</script>';
1573             exit;
1574         }
1575         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1576         exit;
1577     }
1578
1579     // -------- Otherwise, simply display search form and links:
1580     showLinkList($PAGE, $LINKSDB, $conf, $pluginManager);
1581     exit;
1582 }
1583
1584 /**
1585  * Template for the list of links (<div id="linklist">)
1586  * This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1587  *
1588  * @param pageBuilder   $PAGE          pageBuilder instance.
1589  * @param LinkDB        $LINKSDB       LinkDB instance.
1590  * @param ConfigManager $conf          Configuration Manager instance.
1591  * @param PluginManager $pluginManager Plugin Manager instance.
1592  */
1593 function buildLinkList($PAGE,$LINKSDB, $conf, $pluginManager)
1594 {
1595     // Used in templates
1596     $searchtags = !empty($_GET['searchtags']) ? escape($_GET['searchtags']) : '';
1597     $searchterm = !empty($_GET['searchterm']) ? escape($_GET['searchterm']) : '';
1598
1599     // Smallhash filter
1600     if (! empty($_SERVER['QUERY_STRING'])
1601         && preg_match('/^[a-zA-Z0-9-_@]{6}($|&|#)/', $_SERVER['QUERY_STRING'])) {
1602         try {
1603             $linksToDisplay = $LINKSDB->filterHash($_SERVER['QUERY_STRING']);
1604         } catch (LinkNotFoundException $e) {
1605             $PAGE->render404($e->getMessage());
1606             exit;
1607         }
1608     } else {
1609         // Filter links according search parameters.
1610         $privateonly = !empty($_SESSION['privateonly']);
1611         $linksToDisplay = $LINKSDB->filterSearch($_GET, false, $privateonly);
1612     }
1613
1614     // ---- Handle paging.
1615     $keys = array();
1616     foreach ($linksToDisplay as $key => $value) {
1617         $keys[] = $key;
1618     }
1619
1620
1621
1622     // Select articles according to paging.
1623     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1624     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1625     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1626     $page = $page < 1 ? 1 : $page;
1627     $page = $page > $pagecount ? $pagecount : $page;
1628     // Start index.
1629     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1630     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1631     $linkDisp = array();
1632     while ($i<$end && $i<count($keys))
1633     {
1634         $link = $linksToDisplay[$keys[$i]];
1635         $link['description'] = format_description($link['description'], $conf->get('redirector.url'));
1636         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
1637         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
1638         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
1639         $link['timestamp'] = $date->getTimestamp();
1640         if (! empty($link['updated'])) {
1641             $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['updated']);
1642             $link['updated_timestamp'] = $date->getTimestamp();
1643         } else {
1644             $link['updated_timestamp'] = '';
1645         }
1646         $taglist = explode(' ', $link['tags']);
1647         uasort($taglist, 'strcasecmp');
1648         $link['taglist'] = $taglist;
1649         $link['shorturl'] = smallHash($link['linkdate']);
1650         // Check for both signs of a note: starting with ? and 7 chars long.
1651         if ($link['url'][0] === '?' &&
1652             strlen($link['url']) === 7) {
1653             $link['url'] = index_url($_SERVER) . $link['url'];
1654         }
1655
1656         $linkDisp[$keys[$i]] = $link;
1657         $i++;
1658     }
1659
1660     // Compute paging navigation
1661     $searchtagsUrl = empty($searchtags) ? '' : '&searchtags=' . urlencode($searchtags);
1662     $searchtermUrl = empty($searchterm) ? '' : '&searchterm=' . urlencode($searchterm);
1663     $previous_page_url = '';
1664     if ($i != count($keys)) {
1665         $previous_page_url = '?page=' . ($page+1) . $searchtermUrl . $searchtagsUrl;
1666     }
1667     $next_page_url='';
1668     if ($page>1) {
1669         $next_page_url = '?page=' . ($page-1) . $searchtermUrl . $searchtagsUrl;
1670     }
1671
1672     $token = isLoggedIn() ? getToken($conf) : '';
1673
1674     // Fill all template fields.
1675     $data = array(
1676         'previous_page_url' => $previous_page_url,
1677         'next_page_url' => $next_page_url,
1678         'page_current' => $page,
1679         'page_max' => $pagecount,
1680         'result_count' => count($linksToDisplay),
1681         'search_term' => $searchterm,
1682         'search_tags' => $searchtags,
1683         'redirector' => $conf->get('redirector.url'),  // Optional redirector URL.
1684         'links' => $linkDisp,
1685         'tags' => $LINKSDB->allTags(),
1686     );
1687
1688     // If there is only a single link, we change on-the-fly the title of the page.
1689     if (count($linksToDisplay) == 1) {
1690         $data['pagetitle'] = $linksToDisplay[$keys[0]]['title'] .' - '. $conf->get('general.title');
1691     }
1692
1693     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
1694
1695     foreach ($data as $key => $value) {
1696         $PAGE->assign($key, $value);
1697     }
1698
1699     return;
1700 }
1701
1702 /**
1703  * Compute the thumbnail for a link.
1704  *
1705  * With a link to the original URL.
1706  * Understands various services (youtube.com...)
1707  * Input: $url = URL for which the thumbnail must be found.
1708  *        $href = if provided, this URL will be followed instead of $url
1709  * Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1710  * Some of them may be missing.
1711  * Return an empty array if no thumbnail available.
1712  *
1713  * @param ConfigManager $conf Configuration Manager instance.
1714  * @param string        $url
1715  * @param string|bool   $href
1716  *
1717  * @return array
1718  */
1719 function computeThumbnail($conf, $url, $href = false)
1720 {
1721     if (!$conf->get('thumbnail.enable_thumbnails')) return array();
1722     if ($href==false) $href=$url;
1723
1724     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1725     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1726     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1727     $domain = parse_url($url,PHP_URL_HOST);
1728     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1729     {
1730         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1731         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1732                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1733     }
1734     if ($domain=='youtu.be') // Youtube short links
1735     {
1736         $path = parse_url($url,PHP_URL_PATH);
1737         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1738                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1739     }
1740     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1741     {
1742         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1743         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1744                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1745     }
1746
1747     if ($domain=='imgur.com')
1748     {
1749         $path = parse_url($url,PHP_URL_PATH);
1750         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1751         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1752                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1753         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1754                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1755
1756         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1757                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1758     }
1759     if ($domain=='i.imgur.com')
1760     {
1761         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1762         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1763                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1764     }
1765     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1766     {
1767         if (strpos($url,'dailymotion.com/video/')!==false)
1768         {
1769             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1770             return array('src'=>$thumburl,
1771                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1772         }
1773     }
1774     if (endsWith($domain,'.imageshack.us'))
1775     {
1776         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1777         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1778         {
1779             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1780             return array('src'=>$thumburl,
1781                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1782         }
1783     }
1784
1785     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1786     // So we deport the thumbnail generation in order not to slow down page generation
1787     // (and we also cache the thumbnail)
1788
1789     if (! $conf->get('thumbnail.enable_localcache')) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1790
1791     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1792         || $domain=='vimeo.com'
1793         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1794         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1795     )
1796     {
1797         if ($domain=='vimeo.com')
1798         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1799             $path = parse_url($url,PHP_URL_PATH);
1800             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1801         }
1802         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
1803         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
1804             $path = parse_url($url,PHP_URL_PATH);
1805             if (!preg_match('!/\d+.+?!',$path)) return array();
1806         }
1807         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
1808         {   // Make sure this TED URL points to a video (/talks/...)
1809             $path = parse_url($url,PHP_URL_PATH);
1810             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
1811         }
1812         $sign = hash_hmac('sha256', $url, $conf->get('credentials.salt')); // We use the salt to sign data (it's random, secret, and specific to each installation)
1813         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1814                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1815     }
1816
1817     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1818     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1819     // But using the extension will do.
1820     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1821     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1822     {
1823         $sign = hash_hmac('sha256', $url, $conf->get('credentials.salt')); // We use the salt to sign data (it's random, secret, and specific to each installation)
1824         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1825                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1826     }
1827     return array(); // No thumbnail.
1828
1829 }
1830
1831
1832 // Returns the HTML code to display a thumbnail for a link
1833 // with a link to the original URL.
1834 // Understands various services (youtube.com...)
1835 // Input: $url = URL for which the thumbnail must be found.
1836 //        $href = if provided, this URL will be followed instead of $url
1837 // Returns '' if no thumbnail available.
1838 function thumbnail($url,$href=false)
1839 {
1840     // FIXME!
1841     global $conf;
1842     $t = computeThumbnail($conf, $url,$href);
1843     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1844
1845     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
1846     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1847     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1848     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1849     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1850     $html.='></a>';
1851     return $html;
1852 }
1853
1854 // Returns the HTML code to display a thumbnail for a link
1855 // for the picture wall (using lazy image loading)
1856 // Understands various services (youtube.com...)
1857 // Input: $url = URL for which the thumbnail must be found.
1858 //        $href = if provided, this URL will be followed instead of $url
1859 // Returns '' if no thumbnail available.
1860 function lazyThumbnail($conf, $url,$href=false)
1861 {
1862     // FIXME!
1863     global $conf;
1864     $t = computeThumbnail($conf, $url,$href);
1865     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1866
1867     $html='<a href="'.escape($t['href']).'">';
1868
1869     // Lazy image
1870     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
1871
1872     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1873     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1874     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1875     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1876     $html.='>';
1877
1878     // No-JavaScript fallback.
1879     $html.='<noscript><img src="'.escape($t['src']).'"';
1880     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1881     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1882     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1883     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1884     $html.='></noscript></a>';
1885
1886     return $html;
1887 }
1888
1889
1890 /**
1891  * Installation
1892  * This function should NEVER be called if the file data/config.php exists.
1893  *
1894  * @param ConfigManager $conf Configuration Manager instance.
1895  */
1896 function install($conf)
1897 {
1898     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
1899     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
1900
1901
1902     // This part makes sure sessions works correctly.
1903     // (Because on some hosts, session.save_path may not be set correctly,
1904     // or we may not have write access to it.)
1905     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
1906     {   // Step 2: Check if data in session is correct.
1907         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
1908         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
1909         echo 'It currently points to '.session_save_path().'<br>';
1910         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
1911         echo '<br><a href="?">Click to try again.</a></pre>';
1912         die;
1913     }
1914     if (!isset($_SESSION['session_tested']))
1915     {   // Step 1 : Try to store data in session and reload page.
1916         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
1917         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
1918     }
1919     if (isset($_GET['test_session']))
1920     {   // Step 3: Sessions are OK. Remove test parameter from URL.
1921         header('Location: '.index_url($_SERVER));
1922     }
1923
1924
1925     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
1926     {
1927         $tz = 'UTC';
1928         if (!empty($_POST['continent']) && !empty($_POST['city'])
1929             && isTimeZoneValid($_POST['continent'], $_POST['city'])
1930         ) {
1931             $tz = $_POST['continent'].'/'.$_POST['city'];
1932         }
1933         $conf->set('general.timezone', $tz);
1934         $login = $_POST['setlogin'];
1935         $conf->set('credentials.login', $login);
1936         $salt = sha1(uniqid('', true) .'_'. mt_rand());
1937         $conf->set('credentials.salt', $salt);
1938         $conf->set('credentials.hash', sha1($_POST['setpassword'] . $login . $salt));
1939         if (!empty($_POST['title'])) {
1940             $conf->set('general.title', escape($_POST['title']));
1941         } else {
1942             $conf->set('general.title', 'Shared links on '.escape(index_url($_SERVER)));
1943         }
1944         $conf->set('updates.check_updates', !empty($_POST['updateCheck']));
1945         try {
1946             // Everything is ok, let's create config file.
1947             $conf->write(isLoggedIn());
1948         }
1949         catch(Exception $e) {
1950             error_log(
1951                     'ERROR while writing config file after installation.' . PHP_EOL .
1952                     $e->getMessage()
1953                 );
1954
1955             // TODO: do not handle exceptions/errors in JS.
1956             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
1957             exit;
1958         }
1959         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
1960         exit;
1961     }
1962
1963     // Display config form:
1964     list($timezone_form, $timezone_js) = generateTimeZoneForm();
1965     $timezone_html = '';
1966     if ($timezone_form != '') {
1967         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
1968     }
1969
1970     $PAGE = new PageBuilder($conf);
1971     $PAGE->assign('timezone_html',$timezone_html);
1972     $PAGE->assign('timezone_js',$timezone_js);
1973     $PAGE->renderPage('install');
1974     exit;
1975 }
1976
1977 /**
1978  * Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
1979  * I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
1980  * The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
1981  * This function is called by passing the URL:
1982  * http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
1983  * [URL] is the URL of the link (e.g. a flickr page)
1984  * [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
1985  * The function below will fetch the image from the webservice and store it in the cache.
1986  *
1987  * @param ConfigManager $conf Configuration Manager instance,
1988  */
1989 function genThumbnail($conf)
1990 {
1991     // Make sure the parameters in the URL were generated by us.
1992     $sign = hash_hmac('sha256', $_GET['url'], $conf->get('credentials.salt'));
1993     if ($sign!=$_GET['hmac']) die('Naughty boy!');
1994
1995     $cacheDir = $conf->get('resource.thumbnails_cache', 'cache');
1996     // Let's see if we don't already have the image for this URL in the cache.
1997     $thumbname=hash('sha1',$_GET['url']).'.jpg';
1998     if (is_file($cacheDir .'/'. $thumbname))
1999     {   // We have the thumbnail, just serve it:
2000         header('Content-Type: image/jpeg');
2001         echo file_get_contents($cacheDir .'/'. $thumbname);
2002         return;
2003     }
2004     // We may also serve a blank image (if service did not respond)
2005     $blankname=hash('sha1',$_GET['url']).'.gif';
2006     if (is_file($cacheDir .'/'. $blankname))
2007     {
2008         header('Content-Type: image/gif');
2009         echo file_get_contents($cacheDir .'/'. $blankname);
2010         return;
2011     }
2012
2013     // Otherwise, generate the thumbnail.
2014     $url = $_GET['url'];
2015     $domain = parse_url($url,PHP_URL_HOST);
2016
2017     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2018     {
2019         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2020         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2021
2022         // Is this a link to an image, or to a flickr page ?
2023         $imageurl='';
2024         if (endsWith(parse_url($url, PHP_URL_PATH), '.jpg'))
2025         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2026             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2027             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2028         }
2029         else // This is a flickr page (html)
2030         {
2031             // Get the flickr html page.
2032             list($headers, $content) = get_http_response($url, 20);
2033             if (strpos($headers[0], '200 OK') !== false)
2034             {
2035                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2036                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2037                 if (!empty($matches[1])) $imageurl=$matches[1];
2038
2039                 // In albums (and some other pages), the link rel="image_src" is not provided,
2040                 // but flickr provides:
2041                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2042                 if ($imageurl=='')
2043                 {
2044                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2045                     if (!empty($matches[1])) $imageurl=$matches[1];
2046                 }
2047             }
2048         }
2049
2050         if ($imageurl!='')
2051         {   // Let's download the image.
2052             // Image is 240x120, so 10 seconds to download should be enough.
2053             list($headers, $content) = get_http_response($imageurl, 10);
2054             if (strpos($headers[0], '200 OK') !== false) {
2055                 // Save image to cache.
2056                 file_put_contents($cacheDir .'/'. $thumbname, $content);
2057                 header('Content-Type: image/jpeg');
2058                 echo $content;
2059                 return;
2060             }
2061         }
2062     }
2063
2064     elseif ($domain=='vimeo.com' )
2065     {
2066         // This is more complex: we have to perform a HTTP request, then parse the result.
2067         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2068         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2069         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2070         if (strpos($headers[0], '200 OK') !== false) {
2071             $t = unserialize($content);
2072             $imageurl = $t[0]['thumbnail_medium'];
2073             // Then we download the image and serve it to our client.
2074             list($headers, $content) = get_http_response($imageurl, 10);
2075             if (strpos($headers[0], '200 OK') !== false) {
2076                 // Save image to cache.
2077                 file_put_contents($cacheDir .'/'. $thumbname, $content);
2078                 header('Content-Type: image/jpeg');
2079                 echo $content;
2080                 return;
2081             }
2082         }
2083     }
2084
2085     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2086     {
2087         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2088         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2089         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2090         list($headers, $content) = get_http_response($url, 5);
2091         if (strpos($headers[0], '200 OK') !== false) {
2092             // Extract the link to the thumbnail
2093             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2094             if (!empty($matches[1]))
2095             {   // Let's download the image.
2096                 $imageurl=$matches[1];
2097                 // No control on image size, so wait long enough
2098                 list($headers, $content) = get_http_response($imageurl, 20);
2099                 if (strpos($headers[0], '200 OK') !== false) {
2100                     $filepath = $cacheDir .'/'. $thumbname;
2101                     file_put_contents($filepath, $content); // Save image to cache.
2102                     if (resizeImage($filepath))
2103                     {
2104                         header('Content-Type: image/jpeg');
2105                         echo file_get_contents($filepath);
2106                         return;
2107                     }
2108                 }
2109             }
2110         }
2111     }
2112
2113     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2114     {
2115         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2116         // http://xkcd.com/327/
2117         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2118         list($headers, $content) = get_http_response($url, 5);
2119         if (strpos($headers[0], '200 OK') !== false) {
2120             // Extract the link to the thumbnail
2121             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2122             if (!empty($matches[1]))
2123             {   // Let's download the image.
2124                 $imageurl=$matches[1];
2125                 // No control on image size, so wait long enough
2126                 list($headers, $content) = get_http_response($imageurl, 20);
2127                 if (strpos($headers[0], '200 OK') !== false) {
2128                     $filepath = $cacheDir.'/'.$thumbname;
2129                     // Save image to cache.
2130                     file_put_contents($filepath, $content);
2131                     if (resizeImage($filepath))
2132                     {
2133                         header('Content-Type: image/jpeg');
2134                         echo file_get_contents($filepath);
2135                         return;
2136                     }
2137                 }
2138             }
2139         }
2140     }
2141
2142     else
2143     {
2144         // For all other domains, we try to download the image and make a thumbnail.
2145         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2146         list($headers, $content) = get_http_response($url, 30);
2147         if (strpos($headers[0], '200 OK') !== false) {
2148             $filepath = $cacheDir .'/'.$thumbname;
2149             // Save image to cache.
2150             file_put_contents($filepath, $content);
2151             if (resizeImage($filepath))
2152             {
2153                 header('Content-Type: image/jpeg');
2154                 echo file_get_contents($filepath);
2155                 return;
2156             }
2157         }
2158     }
2159
2160
2161     // Otherwise, return an empty image (8x8 transparent gif)
2162     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2163     // Also put something in cache so that this URL is not requested twice.
2164     file_put_contents($cacheDir .'/'. $blankname, $blankgif);
2165     header('Content-Type: image/gif');
2166     echo $blankgif;
2167 }
2168
2169 // Make a thumbnail of the image (to width: 120 pixels)
2170 // Returns true if success, false otherwise.
2171 function resizeImage($filepath)
2172 {
2173     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2174
2175     // Trick: some stupid people rename GIF as JPEG... or else.
2176     // So we really try to open each image type whatever the extension is.
2177     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2178     $im=false;
2179     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2180     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2181     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2182     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2183     $w = imagesx($im);
2184     $h = imagesy($im);
2185     $ystart = 0; $yheight=$h;
2186     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2187     $nw = 120;   // Desired width
2188     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2189     // Resize image:
2190     $im2 = imagecreatetruecolor($nw,$nh);
2191     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2192     imageinterlace($im2,true); // For progressive JPEG.
2193     $tempname=$filepath.'_TEMP.jpg';
2194     imagejpeg($im2, $tempname, 90);
2195     imagedestroy($im);
2196     imagedestroy($im2);
2197     unlink($filepath);
2198     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2199     return true;
2200 }
2201
2202 if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=genthumbnail')) { genThumbnail($conf); exit; }  // Thumbnail generation/cache does not need the link database.
2203 if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=dailyrss')) { showDailyRSS($conf); exit; }
2204 if (!isset($_SESSION['LINKS_PER_PAGE'])) {
2205     $_SESSION['LINKS_PER_PAGE'] = $conf->get('general.links_per_page', 20);
2206 }
2207 renderPage($conf, $pluginManager);