index.php

   1 <?php
   2 /**
   3  * Shaarli v0.8.7 - 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', '0.8.7');
  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         $redir = '&username='. urlencode($_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         $conf->get('redirector.encode_url')
 564     );
 565
 566     /* Some Shaarlies may have very few links, so we need to look
 567        back in time until we have enough days ($nb_of_days).
 568     */
 569     $nb_of_days = 7; // We take 7 days.
 570     $today = date('Ymd');
 571     $days = array();
 572
 573     foreach ($LINKSDB as $link) {
 574         $day = $link['created']->format('Ymd'); // Extract day (without time)
 575         if (strcmp($day, $today) < 0) {
 576             if (empty($days[$day])) {
 577                 $days[$day] = array();
 578             }
 579             $days[$day][] = $link;
 580         }
 581
 582         if (count($days) > $nb_of_days) {
 583             break; // Have we collected enough days?
 584         }
 585     }
 586
 587     // Build the RSS feed.
 588     header('Content-Type: application/rss+xml; charset=utf-8');
 589     $pageaddr = escape(index_url($_SERVER));
 590     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 591     echo '<channel>';
 592     echo '<title>Daily - '. $conf->get('general.title') . '</title>';
 593     echo '<link>'. $pageaddr .'</link>';
 594     echo '<description>Daily shared links</description>';
 595     echo '<language>en-en</language>';
 596     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 597
 598     // For each day.
 599     foreach ($days as $day => $links) {
 600         $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 601         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 602
 603         // We pre-format some fields for proper output.
 604         foreach ($links as &$link) {
 605             $link['formatedDescription'] = format_description($link['description'], $conf->get('redirector.url'));
 606             $link['thumbnail'] = thumbnail($conf, $link['url']);
 607             $link['timestamp'] = $link['created']->getTimestamp();
 608             if (startsWith($link['url'], '?')) {
 609                 $link['url'] = index_url($_SERVER) . $link['url'];  // make permalink URL absolute
 610             }
 611         }
 612
 613         // Then build the HTML for this day:
 614         $tpl = new RainTPL;
 615         $tpl->assign('title', $conf->get('general.title'));
 616         $tpl->assign('daydate', $dayDate->getTimestamp());
 617         $tpl->assign('absurl', $absurl);
 618         $tpl->assign('links', $links);
 619         $tpl->assign('rssdate', escape($dayDate->format(DateTime::RSS)));
 620         $tpl->assign('hide_timestamps', $conf->get('privacy.hide_timestamps', false));
 621         $html = $tpl->draw('dailyrss', $return_string=true);
 622
 623         echo $html . PHP_EOL;
 624     }
 625     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
 626
 627     $cache->cache(ob_get_contents());
 628     ob_end_flush();
 629     exit;
 630 }
 631
 632 /**
 633  * Show the 'Daily' page.
 634  *
 635  * @param PageBuilder   $pageBuilder   Template engine wrapper.
 636  * @param LinkDB        $LINKSDB       LinkDB instance.
 637  * @param ConfigManager $conf          Configuration Manager instance.
 638  * @param PluginManager $pluginManager Plugin Manager instane.
 639  */
 640 function showDaily($pageBuilder, $LINKSDB, $conf, $pluginManager)
 641 {
 642     $day=date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 643     if (isset($_GET['day'])) $day=$_GET['day'];
 644
 645     $days = $LINKSDB->days();
 646     $i = array_search($day,$days);
 647     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
 648     $previousday='';
 649     $nextday='';
 650     if ($i!==false)
 651     {
 652         if ($i>=1) $previousday=$days[$i-1];
 653         if ($i<count($days)-1) $nextday=$days[$i+1];
 654     }
 655
 656     try {
 657         $linksToDisplay = $LINKSDB->filterDay($day);
 658     } catch (Exception $exc) {
 659         error_log($exc);
 660         $linksToDisplay = array();
 661     }
 662
 663     // We pre-format some fields for proper output.
 664     foreach($linksToDisplay as $key=>$link)
 665     {
 666
 667         $taglist = explode(' ',$link['tags']);
 668         uasort($taglist, 'strcasecmp');
 669         $linksToDisplay[$key]['taglist']=$taglist;
 670         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $conf->get('redirector.url'));
 671         $linksToDisplay[$key]['thumbnail'] = thumbnail($conf, $link['url']);
 672         $linksToDisplay[$key]['timestamp'] =  $link['created']->getTimestamp();
 673     }
 674
 675     /* We need to spread the articles on 3 columns.
 676        I did not want to use a JavaScript lib like http://masonry.desandro.com/
 677        so I manually spread entries with a simple method: I roughly evaluate the
 678        height of a div according to title and description length.
 679     */
 680     $columns=array(array(),array(),array()); // Entries to display, for each column.
 681     $fill=array(0,0,0);  // Rough estimate of columns fill.
 682     foreach($linksToDisplay as $key=>$link)
 683     {
 684         // Roughly estimate length of entry (by counting characters)
 685         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
 686         // Description: 836 characters gives roughly 342 pixel height.
 687         // This is not perfect, but it's usually OK.
 688         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
 689         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
 690         // Then put in column which is the less filled:
 691         $smallest=min($fill); // find smallest value in array.
 692         $index=array_search($smallest,$fill); // find index of this smallest value.
 693         array_push($columns[$index],$link); // Put entry in this column.
 694         $fill[$index]+=$length;
 695     }
 696
 697     $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 698     $data = array(
 699         'linksToDisplay' => $linksToDisplay,
 700         'cols' => $columns,
 701         'day' => $dayDate->getTimestamp(),
 702         'previousday' => $previousday,
 703         'nextday' => $nextday,
 704     );
 705
 706     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
 707
 708     foreach ($data as $key => $value) {
 709         $pageBuilder->assign($key, $value);
 710     }
 711
 712     $pageBuilder->renderPage('daily');
 713     exit;
 714 }
 715
 716 /**
 717  * Renders the linklist
 718  *
 719  * @param pageBuilder   $PAGE    pageBuilder instance.
 720  * @param LinkDB        $LINKSDB LinkDB instance.
 721  * @param ConfigManager $conf    Configuration Manager instance.
 722  * @param PluginManager $pluginManager Plugin Manager instance.
 723  */
 724 function showLinkList($PAGE, $LINKSDB, $conf, $pluginManager) {
 725     buildLinkList($PAGE,$LINKSDB, $conf, $pluginManager); // Compute list of links to display
 726     $PAGE->renderPage('linklist');
 727 }
 728
 729 /**
 730  * Render HTML page (according to URL parameters and user rights)
 731  *
 732  * @param ConfigManager $conf          Configuration Manager instance.
 733  * @param PluginManager $pluginManager Plugin Manager instance,
 734  */
 735 function renderPage($conf, $pluginManager)
 736 {
 737     $LINKSDB = new LinkDB(
 738         $conf->get('resource.datastore'),
 739         isLoggedIn(),
 740         $conf->get('privacy.hide_public_links'),
 741         $conf->get('redirector.url'),
 742         $conf->get('redirector.encode_url')
 743     );
 744
 745     $updater = new Updater(
 746         read_updates_file($conf->get('resource.updates')),
 747         $LINKSDB,
 748         $conf,
 749         isLoggedIn()
 750     );
 751     try {
 752         $newUpdates = $updater->update();
 753         if (! empty($newUpdates)) {
 754             write_updates_file(
 755                 $conf->get('resource.updates'),
 756                 $updater->getDoneUpdates()
 757             );
 758         }
 759     }
 760     catch(Exception $e) {
 761         die($e->getMessage());
 762     }
 763
 764     $PAGE = new PageBuilder($conf);
 765     $PAGE->assign('linkcount', count($LINKSDB));
 766     $PAGE->assign('privateLinkcount', count_private($LINKSDB));
 767     $PAGE->assign('plugin_errors', $pluginManager->getErrors());
 768
 769     // Determine which page will be rendered.
 770     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
 771     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
 772
 773     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
 774     // Then assign generated data to RainTPL.
 775     $common_hooks = array(
 776         'includes',
 777         'header',
 778         'footer',
 779     );
 780
 781     foreach($common_hooks as $name) {
 782         $plugin_data = array();
 783         $pluginManager->executeHooks('render_' . $name, $plugin_data,
 784             array(
 785                 'target' => $targetPage,
 786                 'loggedin' => isLoggedIn()
 787             )
 788         );
 789         $PAGE->assign('plugins_' . $name, $plugin_data);
 790     }
 791
 792     // -------- Display login form.
 793     if ($targetPage == Router::$PAGE_LOGIN)
 794     {
 795         if ($conf->get('security.open_shaarli')) { header('Location: ?'); exit; }  // No need to login for open Shaarli
 796         if (isset($_GET['username'])) {
 797             $PAGE->assign('username', escape($_GET['username']));
 798         }
 799         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
 800         $PAGE->renderPage('loginform');
 801         exit;
 802     }
 803     // -------- User wants to logout.
 804     if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=logout'))
 805     {
 806         invalidateCaches($conf->get('resource.page_cache'));
 807         logout();
 808         header('Location: ?');
 809         exit;
 810     }
 811
 812     // -------- Picture wall
 813     if ($targetPage == Router::$PAGE_PICWALL)
 814     {
 815         // Optionally filter the results:
 816         $links = $LINKSDB->filterSearch($_GET);
 817         $linksToDisplay = array();
 818
 819         // Get only links which have a thumbnail.
 820         foreach($links as $link)
 821         {
 822             $permalink='?'.$link['shorturl'];
 823             $thumb=lazyThumbnail($conf, $link['url'],$permalink);
 824             if ($thumb!='') // Only output links which have a thumbnail.
 825             {
 826                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
 827                 $linksToDisplay[]=$link; // Add to array.
 828             }
 829         }
 830
 831         $data = array(
 832             'linksToDisplay' => $linksToDisplay,
 833         );
 834         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
 835
 836         foreach ($data as $key => $value) {
 837             $PAGE->assign($key, $value);
 838         }
 839
 840         $PAGE->renderPage('picwall');
 841         exit;
 842     }
 843
 844     // -------- Tag cloud
 845     if ($targetPage == Router::$PAGE_TAGCLOUD)
 846     {
 847         $tags= $LINKSDB->allTags();
 848
 849         // We sort tags alphabetically, then choose a font size according to count.
 850         // First, find max value.
 851         $maxcount = 0;
 852         foreach ($tags as $value) {
 853             $maxcount = max($maxcount, $value);
 854         }
 855
 856         // Sort tags alphabetically: case insensitive, support locale if available.
 857         uksort($tags, function($a, $b) {
 858             // Collator is part of PHP intl.
 859             if (class_exists('Collator')) {
 860                 $c = new Collator(setlocale(LC_COLLATE, 0));
 861                 if (!intl_is_failure(intl_get_error_code())) {
 862                     return $c->compare($a, $b);
 863                 }
 864             }
 865             return strcasecmp($a, $b);
 866         });
 867
 868         $tagList = array();
 869         foreach($tags as $key => $value) {
 870             // Tag font size scaling:
 871             //   default 15 and 30 logarithm bases affect scaling,
 872             //   22 and 6 are arbitrary font sizes for max and min sizes.
 873             $size = log($value, 15) / log($maxcount, 30) * 2.2 + 0.8;
 874             $tagList[$key] = array(
 875                 'count' => $value,
 876                 'size' => number_format($size, 2, '.', ''),
 877             );
 878         }
 879
 880         $data = array(
 881             'tags' => $tagList,
 882         );
 883         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
 884
 885         foreach ($data as $key => $value) {
 886             $PAGE->assign($key, $value);
 887         }
 888
 889         $PAGE->renderPage('tagcloud');
 890         exit;
 891     }
 892
 893     // Daily page.
 894     if ($targetPage == Router::$PAGE_DAILY) {
 895         showDaily($PAGE, $LINKSDB, $conf, $pluginManager);
 896     }
 897
 898     // ATOM and RSS feed.
 899     if ($targetPage == Router::$PAGE_FEED_ATOM || $targetPage == Router::$PAGE_FEED_RSS) {
 900         $feedType = $targetPage == Router::$PAGE_FEED_RSS ? FeedBuilder::$FEED_RSS : FeedBuilder::$FEED_ATOM;
 901         header('Content-Type: application/'. $feedType .'+xml; charset=utf-8');
 902
 903         // Cache system
 904         $query = $_SERVER['QUERY_STRING'];
 905         $cache = new CachedPage(
 906             $conf->get('resource.page_cache'),
 907             page_url($_SERVER),
 908             startsWith($query,'do='. $targetPage) && !isLoggedIn()
 909         );
 910         $cached = $cache->cachedVersion();
 911         if (!empty($cached)) {
 912             echo $cached;
 913             exit;
 914         }
 915
 916         // Generate data.
 917         $feedGenerator = new FeedBuilder($LINKSDB, $feedType, $_SERVER, $_GET, isLoggedIn());
 918         $feedGenerator->setLocale(strtolower(setlocale(LC_COLLATE, 0)));
 919         $feedGenerator->setHideDates($conf->get('privacy.hide_timestamps') && !isLoggedIn());
 920         $feedGenerator->setUsePermalinks(isset($_GET['permalinks']) || !$conf->get('feed.rss_permalinks'));
 921         $pshUrl = $conf->get('config.PUBSUBHUB_URL');
 922         if (!empty($pshUrl)) {
 923             $feedGenerator->setPubsubhubUrl($pshUrl);
 924         }
 925         $data = $feedGenerator->buildData();
 926
 927         // Process plugin hook.
 928         $pluginManager->executeHooks('render_feed', $data, array(
 929             'loggedin' => isLoggedIn(),
 930             'target' => $targetPage,
 931         ));
 932
 933         // Render the template.
 934         $PAGE->assignAll($data);
 935         $PAGE->renderPage('feed.'. $feedType);
 936         $cache->cache(ob_get_contents());
 937         ob_end_flush();
 938         exit;
 939     }
 940
 941     // Display openseach plugin (XML)
 942     if ($targetPage == Router::$PAGE_OPENSEARCH) {
 943         header('Content-Type: application/xml; charset=utf-8');
 944         $PAGE->assign('serverurl', index_url($_SERVER));
 945         $PAGE->renderPage('opensearch');
 946         exit;
 947     }
 948
 949     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
 950     if (isset($_GET['addtag']))
 951     {
 952         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
 953         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
 954         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
 955
 956         // Prevent redirection loop
 957         if (isset($params['addtag'])) {
 958             unset($params['addtag']);
 959         }
 960
 961         // Check if this tag is already in the search query and ignore it if it is.
 962         // Each tag is always separated by a space
 963         if (isset($params['searchtags'])) {
 964             $current_tags = explode(' ', $params['searchtags']);
 965         } else {
 966             $current_tags = array();
 967         }
 968         $addtag = true;
 969         foreach ($current_tags as $value) {
 970             if ($value === $_GET['addtag']) {
 971                 $addtag = false;
 972                 break;
 973             }
 974         }
 975         // Append the tag if necessary
 976         if (empty($params['searchtags'])) {
 977             $params['searchtags'] = trim($_GET['addtag']);
 978         }
 979         else if ($addtag) {
 980             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
 981         }
 982
 983         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
 984         header('Location: ?'.http_build_query($params));
 985         exit;
 986     }
 987
 988     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
 989     if (isset($_GET['removetag'])) {
 990         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
 991         if (empty($_SERVER['HTTP_REFERER'])) {
 992             header('Location: ?');
 993             exit;
 994         }
 995
 996         // In case browser does not send HTTP_REFERER
 997         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
 998
 999         // Prevent redirection loop
1000         if (isset($params['removetag'])) {
1001             unset($params['removetag']);
1002         }
1003
1004         if (isset($params['searchtags'])) {
1005             $tags = explode(' ', $params['searchtags']);
1006             // Remove value from array $tags.
1007             $tags = array_diff($tags, array($_GET['removetag']));
1008             $params['searchtags'] = implode(' ',$tags);
1009
1010             if (empty($params['searchtags'])) {
1011                 unset($params['searchtags']);
1012             }
1013
1014             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1015         }
1016         header('Location: ?'.http_build_query($params));
1017         exit;
1018     }
1019
1020     // -------- User wants to change the number of links per page (linksperpage=...)
1021     if (isset($_GET['linksperpage'])) {
1022         if (is_numeric($_GET['linksperpage'])) {
1023             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1024         }
1025
1026         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1027         exit;
1028     }
1029
1030     // -------- User wants to see only private links (toggle)
1031     if (isset($_GET['privateonly'])) {
1032         if (empty($_SESSION['privateonly'])) {
1033             $_SESSION['privateonly'] = 1; // See only private links
1034         } else {
1035             unset($_SESSION['privateonly']); // See all links
1036         }
1037
1038         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1039         exit;
1040     }
1041
1042     // -------- Handle other actions allowed for non-logged in users:
1043     if (!isLoggedIn())
1044     {
1045         // User tries to post new link but is not logged in:
1046         // Show login screen, then redirect to ?post=...
1047         if (isset($_GET['post']))
1048         {
1049             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1050             exit;
1051         }
1052
1053         showLinkList($PAGE, $LINKSDB, $conf, $pluginManager);
1054         if (isset($_GET['edit_link'])) {
1055             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1056             exit;
1057         }
1058
1059         exit; // Never remove this one! All operations below are reserved for logged in user.
1060     }
1061
1062     // -------- All other functions are reserved for the registered user:
1063
1064     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1065     if ($targetPage == Router::$PAGE_TOOLS)
1066     {
1067         $data = array(
1068             'pageabsaddr' => index_url($_SERVER),
1069             'sslenabled' => !empty($_SERVER['HTTPS'])
1070         );
1071         $pluginManager->executeHooks('render_tools', $data);
1072
1073         foreach ($data as $key => $value) {
1074             $PAGE->assign($key, $value);
1075         }
1076
1077         $PAGE->renderPage('tools');
1078         exit;
1079     }
1080
1081     // -------- User wants to change his/her password.
1082     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1083     {
1084         if ($conf->get('security.open_shaarli')) {
1085             die('You are not supposed to change a password on an Open Shaarli.');
1086         }
1087
1088         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1089         {
1090             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1091
1092             // Make sure old password is correct.
1093             $oldhash = sha1($_POST['oldpassword'].$conf->get('credentials.login').$conf->get('credentials.salt'));
1094             if ($oldhash!= $conf->get('credentials.hash')) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1095             // Save new password
1096             // Salt renders rainbow-tables attacks useless.
1097             $conf->set('credentials.salt', sha1(uniqid('', true) .'_'. mt_rand()));
1098             $conf->set('credentials.hash', sha1($_POST['setpassword'] . $conf->get('credentials.login') . $conf->get('credentials.salt')));
1099             try {
1100                 $conf->write(isLoggedIn());
1101             }
1102             catch(Exception $e) {
1103                 error_log(
1104                     'ERROR while writing config file after changing password.' . PHP_EOL .
1105                     $e->getMessage()
1106                 );
1107
1108                 // TODO: do not handle exceptions/errors in JS.
1109                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1110                 exit;
1111             }
1112             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1113             exit;
1114         }
1115         else // show the change password form.
1116         {
1117             $PAGE->renderPage('changepassword');
1118             exit;
1119         }
1120     }
1121
1122     // -------- User wants to change configuration
1123     if ($targetPage == Router::$PAGE_CONFIGURE)
1124     {
1125         if (!empty($_POST['title']) )
1126         {
1127             if (!tokenOk($_POST['token'])) {
1128                 die('Wrong token.'); // Go away!
1129             }
1130             $tz = 'UTC';
1131             if (!empty($_POST['continent']) && !empty($_POST['city'])
1132                 && isTimeZoneValid($_POST['continent'], $_POST['city'])
1133             ) {
1134                 $tz = $_POST['continent'] . '/' . $_POST['city'];
1135             }
1136             $conf->set('general.timezone', $tz);
1137             $conf->set('general.title', escape($_POST['title']));
1138             $conf->set('general.header_link', escape($_POST['titleLink']));
1139             $conf->set('redirector.url', escape($_POST['redirector']));
1140             $conf->set('security.session_protection_disabled', !empty($_POST['disablesessionprotection']));
1141             $conf->set('privacy.default_private_links', !empty($_POST['privateLinkByDefault']));
1142             $conf->set('feed.rss_permalinks', !empty($_POST['enableRssPermalinks']));
1143             $conf->set('updates.check_updates', !empty($_POST['updateCheck']));
1144             $conf->set('privacy.hide_public_links', !empty($_POST['hidePublicLinks']));
1145             try {
1146                 $conf->write(isLoggedIn());
1147             }
1148             catch(Exception $e) {
1149                 error_log(
1150                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1151                     $e->getMessage()
1152                 );
1153
1154                 // TODO: do not handle exceptions/errors in JS.
1155                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=configure\';</script>';
1156                 exit;
1157             }
1158             echo '<script>alert("Configuration was saved.");document.location=\'?do=configure\';</script>';
1159             exit;
1160         }
1161         else // Show the configuration form.
1162         {
1163             $PAGE->assign('title', $conf->get('general.title'));
1164             $PAGE->assign('redirector', $conf->get('redirector.url'));
1165             list($timezone_form, $timezone_js) = generateTimeZoneForm($conf->get('general.timezone'));
1166             $PAGE->assign('timezone_form', $timezone_form);
1167             $PAGE->assign('timezone_js',$timezone_js);
1168             $PAGE->assign('private_links_default', $conf->get('privacy.default_private_links', false));
1169             $PAGE->assign('session_protection_disabled', $conf->get('security.session_protection_disabled', false));
1170             $PAGE->assign('enable_rss_permalinks', $conf->get('feed.rss_permalinks', false));
1171             $PAGE->assign('enable_update_check', $conf->get('updates.check_updates', true));
1172             $PAGE->assign('hide_public_links', $conf->get('privacy.hide_public_links', false));
1173             $PAGE->renderPage('configure');
1174             exit;
1175         }
1176     }
1177
1178     // -------- User wants to rename a tag or delete it
1179     if ($targetPage == Router::$PAGE_CHANGETAG)
1180     {
1181         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1182             $PAGE->assign('tags', $LINKSDB->allTags());
1183             $PAGE->renderPage('changetag');
1184             exit;
1185         }
1186
1187         if (!tokenOk($_POST['token'])) {
1188             die('Wrong token.');
1189         }
1190
1191         // Delete a tag:
1192         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1193             $needle = trim($_POST['fromtag']);
1194             // True for case-sensitive tag search.
1195             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1196             foreach($linksToAlter as $key=>$value)
1197             {
1198                 $tags = explode(' ',trim($value['tags']));
1199                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1200                 $value['tags']=trim(implode(' ',$tags));
1201                 $LINKSDB[$key]=$value;
1202             }
1203             $LINKSDB->save($conf->get('resource.page_cache'));
1204             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1205             exit;
1206         }
1207
1208         // Rename a tag:
1209         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1210             $needle = trim($_POST['fromtag']);
1211             // True for case-sensitive tag search.
1212             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1213             foreach($linksToAlter as $key=>$value)
1214             {
1215                 $tags = explode(' ',trim($value['tags']));
1216                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1217                 $value['tags']=trim(implode(' ',$tags));
1218                 $LINKSDB[$key]=$value;
1219             }
1220             $LINKSDB->save($conf->get('resource.page_cache')); // Save to disk.
1221             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1222             exit;
1223         }
1224     }
1225
1226     // -------- User wants to add a link without using the bookmarklet: Show form.
1227     if ($targetPage == Router::$PAGE_ADDLINK)
1228     {
1229         $PAGE->renderPage('addlink');
1230         exit;
1231     }
1232
1233     // -------- User clicked the "Save" button when editing a link: Save link to database.
1234     if (isset($_POST['save_edit']))
1235     {
1236         // Go away!
1237         if (! tokenOk($_POST['token'])) {
1238             die('Wrong token.');
1239         }
1240
1241         // lf_id should only be present if the link exists.
1242         $id = !empty($_POST['lf_id']) ? intval(escape($_POST['lf_id'])) : $LINKSDB->getNextId();
1243         // Linkdate is kept here to:
1244         //   - use the same permalink for notes as they're displayed when creating them
1245         //   - let users hack creation date of their posts
1246         //     See: https://github.com/shaarli/Shaarli/wiki/Datastore-hacks#changing-the-timestamp-for-a-link
1247         $linkdate = escape($_POST['lf_linkdate']);
1248         if (isset($LINKSDB[$id])) {
1249             // Edit
1250             $created = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $linkdate);
1251             $updated = new DateTime();
1252             $shortUrl = $LINKSDB[$id]['shorturl'];
1253         } else {
1254             // New link
1255             $created = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $linkdate);
1256             $updated = null;
1257             $shortUrl = link_small_hash($created, $id);
1258         }
1259
1260         // Remove multiple spaces.
1261         $tags = trim(preg_replace('/\s\s+/', ' ', $_POST['lf_tags']));
1262         // Remove first '-' char in tags.
1263         $tags = preg_replace('/(^| )\-/', '$1', $tags);
1264         // Remove duplicates.
1265         $tags = implode(' ', array_unique(explode(' ', $tags)));
1266
1267         $url = trim($_POST['lf_url']);
1268         if (! startsWith($url, 'http:') && ! startsWith($url, 'https:')
1269             && ! startsWith($url, 'ftp:') && ! startsWith($url, 'magnet:')
1270             && ! startsWith($url, '?') && ! startsWith($url, 'javascript:')
1271         ) {
1272             $url = 'http://' . $url;
1273         }
1274
1275         $link = array(
1276             'id' => $id,
1277             'title' => trim($_POST['lf_title']),
1278             'url' => $url,
1279             'description' => $_POST['lf_description'],
1280             'private' => (isset($_POST['lf_private']) ? 1 : 0),
1281             'created' => $created,
1282             'updated' => $updated,
1283             'tags' => str_replace(',', ' ', $tags),
1284             'shorturl' => $shortUrl,
1285         );
1286
1287         // If title is empty, use the URL as title.
1288         if ($link['title'] == '') {
1289             $link['title'] = $link['url'];
1290         }
1291
1292         $pluginManager->executeHooks('save_link', $link);
1293
1294         $LINKSDB[$id] = $link;
1295         $LINKSDB->save($conf->get('resource.page_cache'));
1296         pubsubhub($conf);
1297
1298         // If we are called from the bookmarklet, we must close the popup:
1299         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1300             echo '<script>self.close();</script>';
1301             exit;
1302         }
1303
1304         $returnurl = !empty($_POST['returnurl']) ? $_POST['returnurl'] : '?';
1305         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1306         // Scroll to the link which has been edited.
1307         $location .= '#' . $link['shorturl'];
1308         // After saving the link, redirect to the page the user was on.
1309         header('Location: '. $location);
1310         exit;
1311     }
1312
1313     // -------- User clicked the "Cancel" button when editing a link.
1314     if (isset($_POST['cancel_edit']))
1315     {
1316         // If we are called from the bookmarklet, we must close the popup:
1317         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1318         $link = $LINKSDB[(int) escape($_POST['lf_id'])];
1319         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1320         // Scroll to the link which has been edited.
1321         $returnurl .= '#'. $link['shorturl'];
1322         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1323         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1324         exit;
1325     }
1326
1327     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1328     if (isset($_POST['delete_link']))
1329     {
1330         if (!tokenOk($_POST['token'])) die('Wrong token.');
1331
1332         // We do not need to ask for confirmation:
1333         // - confirmation is handled by JavaScript
1334         // - we are protected from XSRF by the token.
1335
1336         // FIXME! We keep `lf_linkdate` for consistency before a proper API. To be removed.
1337         $id = isset($_POST['lf_id']) ? intval(escape($_POST['lf_id'])) : intval(escape($_POST['lf_linkdate']));
1338
1339         $pluginManager->executeHooks('delete_link', $LINKSDB[$id]);
1340
1341         unset($LINKSDB[$id]);
1342         $LINKSDB->save('resource.page_cache'); // save to disk
1343
1344         // If we are called from the bookmarklet, we must close the popup:
1345         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1346         // Pick where we're going to redirect
1347         // =============================================================
1348         // Basically, we can't redirect to where we were previously if it was a permalink
1349         // or an edit_link, because it would 404.
1350         // Cases:
1351         //    - /             : nothing in $_GET, redirect to self
1352         //    - /?page        : redirect to self
1353         //    - /?searchterm  : redirect to self (there might be other links)
1354         //    - /?searchtags  : redirect to self
1355         //    - /permalink    : redirect to / (the link does not exist anymore)
1356         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1357         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1358         // redirect is not satisfied, and only then redirect to /
1359         $location = "?";
1360         // Self redirection
1361         if (count($_GET) == 0
1362             || isset($_GET['page'])
1363             || isset($_GET['searchterm'])
1364             || isset($_GET['searchtags'])
1365         ) {
1366             if (isset($_POST['returnurl'])) {
1367                 $location = $_POST['returnurl']; // Handle redirects given by the form
1368             } else {
1369                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1370             }
1371         }
1372
1373         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1374         exit;
1375     }
1376
1377     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1378     if (isset($_GET['edit_link']))
1379     {
1380         $id = (int) escape($_GET['edit_link']);
1381         $link = $LINKSDB[$id];  // Read database
1382         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1383         $link['linkdate'] = $link['created']->format(LinkDB::LINK_DATE_FORMAT);
1384         $data = array(
1385             'link' => $link,
1386             'link_is_new' => false,
1387             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1388             'tags' => $LINKSDB->allTags(),
1389         );
1390         $pluginManager->executeHooks('render_editlink', $data);
1391
1392         foreach ($data as $key => $value) {
1393             $PAGE->assign($key, $value);
1394         }
1395
1396         $PAGE->renderPage('editlink');
1397         exit;
1398     }
1399
1400     // -------- User want to post a new link: Display link edit form.
1401     if (isset($_GET['post'])) {
1402         $url = cleanup_url($_GET['post']);
1403
1404         $link_is_new = false;
1405         // Check if URL is not already in database (in this case, we will edit the existing link)
1406         $link = $LINKSDB->getLinkFromUrl($url);
1407         if (! $link)
1408         {
1409             $link_is_new = true;
1410             $linkdate = strval(date(LinkDB::LINK_DATE_FORMAT));
1411             // Get title if it was provided in URL (by the bookmarklet).
1412             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1413             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1414             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1415             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1416             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1417             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1418             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1419                 // Short timeout to keep the application responsive
1420                 list($headers, $content) = get_http_response($url, 4);
1421                 if (strpos($headers[0], '200 OK') !== false) {
1422                     // Retrieve charset.
1423                     $charset = get_charset($headers, $content);
1424                     // Extract title.
1425                     $title = html_extract_title($content);
1426                     // Re-encode title in utf-8 if necessary.
1427                     if (! empty($title) && strtolower($charset) != 'utf-8') {
1428                         $title = mb_convert_encoding($title, 'utf-8', $charset);
1429                     }
1430                 }
1431             }
1432
1433             if ($url == '') {
1434                 $url = '?' . smallHash($linkdate . $LINKSDB->getNextId());
1435                 $title = 'Note: ';
1436             }
1437             $url = escape($url);
1438             $title = escape($title);
1439
1440             $link = array(
1441                 'linkdate' => $linkdate,
1442                 'title' => $title,
1443                 'url' => $url,
1444                 'description' => $description,
1445                 'tags' => $tags,
1446                 'private' => $private
1447             );
1448         } else {
1449             $link['linkdate'] = $link['created']->format(LinkDB::LINK_DATE_FORMAT);
1450         }
1451
1452         $data = array(
1453             'link' => $link,
1454             'link_is_new' => $link_is_new,
1455             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1456             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1457             'tags' => $LINKSDB->allTags(),
1458             'default_private_links' => $conf->get('privacy.default_private_links', false),
1459         );
1460         $pluginManager->executeHooks('render_editlink', $data);
1461
1462         foreach ($data as $key => $value) {
1463             $PAGE->assign($key, $value);
1464         }
1465
1466         $PAGE->renderPage('editlink');
1467         exit;
1468     }
1469
1470     if ($targetPage == Router::$PAGE_EXPORT) {
1471         // Export links as a Netscape Bookmarks file
1472
1473         if (empty($_GET['selection'])) {
1474             $PAGE->renderPage('export');
1475             exit;
1476         }
1477
1478         // export as bookmarks_(all|private|public)_YYYYmmdd_HHMMSS.html
1479         $selection = $_GET['selection'];
1480         if (isset($_GET['prepend_note_url'])) {
1481             $prependNoteUrl = $_GET['prepend_note_url'];
1482         } else {
1483             $prependNoteUrl = false;
1484         }
1485
1486         try {
1487             $PAGE->assign(
1488                 'links',
1489                 NetscapeBookmarkUtils::filterAndFormat(
1490                     $LINKSDB,
1491                     $selection,
1492                     $prependNoteUrl,
1493                     index_url($_SERVER)
1494                 )
1495             );
1496         } catch (Exception $exc) {
1497             header('Content-Type: text/plain; charset=utf-8');
1498             echo $exc->getMessage();
1499             exit;
1500         }
1501         $now = new DateTime();
1502         header('Content-Type: text/html; charset=utf-8');
1503         header(
1504             'Content-disposition: attachment; filename=bookmarks_'
1505            .$selection.'_'.$now->format(LinkDB::LINK_DATE_FORMAT).'.html'
1506         );
1507         $PAGE->assign('date', $now->format(DateTime::RFC822));
1508         $PAGE->assign('eol', PHP_EOL);
1509         $PAGE->assign('selection', $selection);
1510         $PAGE->renderPage('export.bookmarks');
1511         exit;
1512     }
1513
1514     if ($targetPage == Router::$PAGE_IMPORT) {
1515         // Upload a Netscape bookmark dump to import its contents
1516
1517         if (! isset($_POST['token']) || ! isset($_FILES['filetoupload'])) {
1518             // Show import dialog
1519             $PAGE->assign('maxfilesize', getMaxFileSize());
1520             $PAGE->renderPage('import');
1521             exit;
1522         }
1523
1524         // Import bookmarks from an uploaded file
1525         if (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size'] == 0) {
1526             // The file is too big or some form field may be missing.
1527             echo '<script>alert("The file you are trying to upload is probably'
1528                 .' bigger than what this webserver can accept ('
1529                 .getMaxFileSize().' bytes).'
1530                 .' Please upload in smaller chunks.");document.location=\'?do='
1531                 .Router::$PAGE_IMPORT .'\';</script>';
1532             exit;
1533         }
1534         if (! tokenOk($_POST['token'])) {
1535             die('Wrong token.');
1536         }
1537         $status = NetscapeBookmarkUtils::import(
1538             $_POST,
1539             $_FILES,
1540             $LINKSDB,
1541             $conf->get('resource.page_cache')
1542         );
1543         echo '<script>alert("'.$status.'");document.location=\'?do='
1544              .Router::$PAGE_IMPORT .'\';</script>';
1545         exit;
1546     }
1547
1548     // Plugin administration page
1549     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1550         $pluginMeta = $pluginManager->getPluginsMeta();
1551
1552         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1553         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1554         // Load parameters.
1555         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $conf->get('plugins', array()));
1556         uasort(
1557             $enabledPlugins,
1558             function($a, $b) { return $a['order'] - $b['order']; }
1559         );
1560         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1561
1562         $PAGE->assign('enabledPlugins', $enabledPlugins);
1563         $PAGE->assign('disabledPlugins', $disabledPlugins);
1564         $PAGE->renderPage('pluginsadmin');
1565         exit;
1566     }
1567
1568     // Plugin administration form action
1569     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1570         try {
1571             if (isset($_POST['parameters_form'])) {
1572                 unset($_POST['parameters_form']);
1573                 foreach ($_POST as $param => $value) {
1574                     $conf->set('plugins.'. $param, escape($value));
1575                 }
1576             }
1577             else {
1578                 $conf->set('general.enabled_plugins', save_plugin_config($_POST));
1579             }
1580             $conf->write(isLoggedIn());
1581         }
1582         catch (Exception $e) {
1583             error_log(
1584                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1585                 $e->getMessage()
1586             );
1587
1588             // TODO: do not handle exceptions/errors in JS.
1589             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do='. Router::$PAGE_PLUGINSADMIN .'\';</script>';
1590             exit;
1591         }
1592         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1593         exit;
1594     }
1595
1596     // -------- Otherwise, simply display search form and links:
1597     showLinkList($PAGE, $LINKSDB, $conf, $pluginManager);
1598     exit;
1599 }
1600
1601 /**
1602  * Template for the list of links (<div id="linklist">)
1603  * This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1604  *
1605  * @param pageBuilder   $PAGE          pageBuilder instance.
1606  * @param LinkDB        $LINKSDB       LinkDB instance.
1607  * @param ConfigManager $conf          Configuration Manager instance.
1608  * @param PluginManager $pluginManager Plugin Manager instance.
1609  */
1610 function buildLinkList($PAGE,$LINKSDB, $conf, $pluginManager)
1611 {
1612     // Used in templates
1613     $searchtags = !empty($_GET['searchtags']) ? escape($_GET['searchtags']) : '';
1614     $searchterm = !empty($_GET['searchterm']) ? escape($_GET['searchterm']) : '';
1615
1616     // Smallhash filter
1617     if (! empty($_SERVER['QUERY_STRING'])
1618         && preg_match('/^[a-zA-Z0-9-_@]{6}($|&|#)/', $_SERVER['QUERY_STRING'])) {
1619         try {
1620             $linksToDisplay = $LINKSDB->filterHash($_SERVER['QUERY_STRING']);
1621         } catch (LinkNotFoundException $e) {
1622             $PAGE->render404($e->getMessage());
1623             exit;
1624         }
1625     } else {
1626         // Filter links according search parameters.
1627         $privateonly = !empty($_SESSION['privateonly']);
1628         $linksToDisplay = $LINKSDB->filterSearch($_GET, false, $privateonly);
1629     }
1630
1631     // ---- Handle paging.
1632     $keys = array();
1633     foreach ($linksToDisplay as $key => $value) {
1634         $keys[] = $key;
1635     }
1636
1637
1638
1639     // Select articles according to paging.
1640     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1641     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1642     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1643     $page = $page < 1 ? 1 : $page;
1644     $page = $page > $pagecount ? $pagecount : $page;
1645     // Start index.
1646     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1647     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1648     $linkDisp = array();
1649     while ($i<$end && $i<count($keys))
1650     {
1651         $link = $linksToDisplay[$keys[$i]];
1652         $link['description'] = format_description($link['description'], $conf->get('redirector.url'));
1653         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
1654         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
1655         $link['timestamp'] = $link['created']->getTimestamp();
1656         if (! empty($link['updated'])) {
1657             $link['updated_timestamp'] = $link['updated']->getTimestamp();
1658         } else {
1659             $link['updated_timestamp'] = '';
1660         }
1661         $taglist = explode(' ', $link['tags']);
1662         uasort($taglist, 'strcasecmp');
1663         $link['taglist'] = $taglist;
1664         // Check for both signs of a note: starting with ? and 7 chars long.
1665         if ($link['url'][0] === '?' &&
1666             strlen($link['url']) === 7) {
1667             $link['url'] = index_url($_SERVER) . $link['url'];
1668         }
1669
1670         $linkDisp[$keys[$i]] = $link;
1671         $i++;
1672     }
1673
1674     // Compute paging navigation
1675     $searchtagsUrl = empty($searchtags) ? '' : '&searchtags=' . urlencode($searchtags);
1676     $searchtermUrl = empty($searchterm) ? '' : '&searchterm=' . urlencode($searchterm);
1677     $previous_page_url = '';
1678     if ($i != count($keys)) {
1679         $previous_page_url = '?page=' . ($page+1) . $searchtermUrl . $searchtagsUrl;
1680     }
1681     $next_page_url='';
1682     if ($page>1) {
1683         $next_page_url = '?page=' . ($page-1) . $searchtermUrl . $searchtagsUrl;
1684     }
1685
1686     // Fill all template fields.
1687     $data = array(
1688         'previous_page_url' => $previous_page_url,
1689         'next_page_url' => $next_page_url,
1690         'page_current' => $page,
1691         'page_max' => $pagecount,
1692         'result_count' => count($linksToDisplay),
1693         'search_term' => $searchterm,
1694         'search_tags' => $searchtags,
1695         'redirector' => $conf->get('redirector.url'),  // Optional redirector URL.
1696         'links' => $linkDisp,
1697         'tags' => $LINKSDB->allTags(),
1698     );
1699
1700     // If there is only a single link, we change on-the-fly the title of the page.
1701     if (count($linksToDisplay) == 1) {
1702         $data['pagetitle'] = $linksToDisplay[$keys[0]]['title'] .' - '. $conf->get('general.title');
1703     }
1704
1705     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
1706
1707     foreach ($data as $key => $value) {
1708         $PAGE->assign($key, $value);
1709     }
1710
1711     return;
1712 }
1713
1714 /**
1715  * Compute the thumbnail for a link.
1716  *
1717  * With a link to the original URL.
1718  * Understands various services (youtube.com...)
1719  * Input: $url = URL for which the thumbnail must be found.
1720  *        $href = if provided, this URL will be followed instead of $url
1721  * Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1722  * Some of them may be missing.
1723  * Return an empty array if no thumbnail available.
1724  *
1725  * @param ConfigManager $conf Configuration Manager instance.
1726  * @param string        $url
1727  * @param string|bool   $href
1728  *
1729  * @return array
1730  */
1731 function computeThumbnail($conf, $url, $href = false)
1732 {
1733     if (!$conf->get('thumbnail.enable_thumbnails')) return array();
1734     if ($href==false) $href=$url;
1735
1736     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1737     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1738     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1739     $domain = parse_url($url,PHP_URL_HOST);
1740     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1741     {
1742         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1743         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1744                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1745     }
1746     if ($domain=='youtu.be') // Youtube short links
1747     {
1748         $path = parse_url($url,PHP_URL_PATH);
1749         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1750                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1751     }
1752     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1753     {
1754         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1755         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1756                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1757     }
1758
1759     if ($domain=='imgur.com')
1760     {
1761         $path = parse_url($url,PHP_URL_PATH);
1762         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1763         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1764                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1765         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1766                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1767
1768         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1769                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1770     }
1771     if ($domain=='i.imgur.com')
1772     {
1773         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1774         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1775                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1776     }
1777     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1778     {
1779         if (strpos($url,'dailymotion.com/video/')!==false)
1780         {
1781             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1782             return array('src'=>$thumburl,
1783                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1784         }
1785     }
1786     if (endsWith($domain,'.imageshack.us'))
1787     {
1788         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1789         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1790         {
1791             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1792             return array('src'=>$thumburl,
1793                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1794         }
1795     }
1796
1797     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1798     // So we deport the thumbnail generation in order not to slow down page generation
1799     // (and we also cache the thumbnail)
1800
1801     if (! $conf->get('thumbnail.enable_localcache')) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1802
1803     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1804         || $domain=='vimeo.com'
1805         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1806         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1807     )
1808     {
1809         if ($domain=='vimeo.com')
1810         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1811             $path = parse_url($url,PHP_URL_PATH);
1812             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1813         }
1814         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
1815         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
1816             $path = parse_url($url,PHP_URL_PATH);
1817             if (!preg_match('!/\d+.+?!',$path)) return array();
1818         }
1819         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
1820         {   // Make sure this TED URL points to a video (/talks/...)
1821             $path = parse_url($url,PHP_URL_PATH);
1822             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
1823         }
1824         $sign = hash_hmac('sha256', $url, $conf->get('credentials.salt')); // We use the salt to sign data (it's random, secret, and specific to each installation)
1825         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1826                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1827     }
1828
1829     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1830     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1831     // But using the extension will do.
1832     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1833     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1834     {
1835         $sign = hash_hmac('sha256', $url, $conf->get('credentials.salt')); // We use the salt to sign data (it's random, secret, and specific to each installation)
1836         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1837                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1838     }
1839     return array(); // No thumbnail.
1840
1841 }
1842
1843
1844 // Returns the HTML code to display a thumbnail for a link
1845 // with a link to the original URL.
1846 // Understands various services (youtube.com...)
1847 // Input: $url = URL for which the thumbnail must be found.
1848 //        $href = if provided, this URL will be followed instead of $url
1849 // Returns '' if no thumbnail available.
1850 function thumbnail($url,$href=false)
1851 {
1852     // FIXME!
1853     global $conf;
1854     $t = computeThumbnail($conf, $url,$href);
1855     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1856
1857     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
1858     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1859     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1860     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1861     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1862     $html.='></a>';
1863     return $html;
1864 }
1865
1866 // Returns the HTML code to display a thumbnail for a link
1867 // for the picture wall (using lazy image loading)
1868 // Understands various services (youtube.com...)
1869 // Input: $url = URL for which the thumbnail must be found.
1870 //        $href = if provided, this URL will be followed instead of $url
1871 // Returns '' if no thumbnail available.
1872 function lazyThumbnail($conf, $url,$href=false)
1873 {
1874     // FIXME!
1875     global $conf;
1876     $t = computeThumbnail($conf, $url,$href);
1877     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1878
1879     $html='<a href="'.escape($t['href']).'">';
1880
1881     // Lazy image
1882     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
1883
1884     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1885     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1886     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1887     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1888     $html.='>';
1889
1890     // No-JavaScript fallback.
1891     $html.='<noscript><img src="'.escape($t['src']).'"';
1892     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1893     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1894     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1895     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1896     $html.='></noscript></a>';
1897
1898     return $html;
1899 }
1900
1901
1902 /**
1903  * Installation
1904  * This function should NEVER be called if the file data/config.php exists.
1905  *
1906  * @param ConfigManager $conf Configuration Manager instance.
1907  */
1908 function install($conf)
1909 {
1910     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
1911     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
1912
1913
1914     // This part makes sure sessions works correctly.
1915     // (Because on some hosts, session.save_path may not be set correctly,
1916     // or we may not have write access to it.)
1917     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
1918     {   // Step 2: Check if data in session is correct.
1919         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
1920         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
1921         echo 'It currently points to '.session_save_path().'<br>';
1922         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
1923         echo '<br><a href="?">Click to try again.</a></pre>';
1924         die;
1925     }
1926     if (!isset($_SESSION['session_tested']))
1927     {   // Step 1 : Try to store data in session and reload page.
1928         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
1929         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
1930     }
1931     if (isset($_GET['test_session']))
1932     {   // Step 3: Sessions are OK. Remove test parameter from URL.
1933         header('Location: '.index_url($_SERVER));
1934     }
1935
1936
1937     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
1938     {
1939         $tz = 'UTC';
1940         if (!empty($_POST['continent']) && !empty($_POST['city'])
1941             && isTimeZoneValid($_POST['continent'], $_POST['city'])
1942         ) {
1943             $tz = $_POST['continent'].'/'.$_POST['city'];
1944         }
1945         $conf->set('general.timezone', $tz);
1946         $login = $_POST['setlogin'];
1947         $conf->set('credentials.login', $login);
1948         $salt = sha1(uniqid('', true) .'_'. mt_rand());
1949         $conf->set('credentials.salt', $salt);
1950         $conf->set('credentials.hash', sha1($_POST['setpassword'] . $login . $salt));
1951         if (!empty($_POST['title'])) {
1952             $conf->set('general.title', escape($_POST['title']));
1953         } else {
1954             $conf->set('general.title', 'Shared links on '.escape(index_url($_SERVER)));
1955         }
1956         $conf->set('updates.check_updates', !empty($_POST['updateCheck']));
1957         try {
1958             // Everything is ok, let's create config file.
1959             $conf->write(isLoggedIn());
1960         }
1961         catch(Exception $e) {
1962             error_log(
1963                     'ERROR while writing config file after installation.' . PHP_EOL .
1964                     $e->getMessage()
1965                 );
1966
1967             // TODO: do not handle exceptions/errors in JS.
1968             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
1969             exit;
1970         }
1971         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
1972         exit;
1973     }
1974
1975     // Display config form:
1976     list($timezone_form, $timezone_js) = generateTimeZoneForm();
1977     $timezone_html = '';
1978     if ($timezone_form != '') {
1979         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
1980     }
1981
1982     $PAGE = new PageBuilder($conf);
1983     $PAGE->assign('timezone_html',$timezone_html);
1984     $PAGE->assign('timezone_js',$timezone_js);
1985     $PAGE->renderPage('install');
1986     exit;
1987 }
1988
1989 /**
1990  * Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
1991  * I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
1992  * The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
1993  * This function is called by passing the URL:
1994  * http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
1995  * [URL] is the URL of the link (e.g. a flickr page)
1996  * [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
1997  * The function below will fetch the image from the webservice and store it in the cache.
1998  *
1999  * @param ConfigManager $conf Configuration Manager instance,
2000  */
2001 function genThumbnail($conf)
2002 {
2003     // Make sure the parameters in the URL were generated by us.
2004     $sign = hash_hmac('sha256', $_GET['url'], $conf->get('credentials.salt'));
2005     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2006
2007     $cacheDir = $conf->get('resource.thumbnails_cache', 'cache');
2008     // Let's see if we don't already have the image for this URL in the cache.
2009     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2010     if (is_file($cacheDir .'/'. $thumbname))
2011     {   // We have the thumbnail, just serve it:
2012         header('Content-Type: image/jpeg');
2013         echo file_get_contents($cacheDir .'/'. $thumbname);
2014         return;
2015     }
2016     // We may also serve a blank image (if service did not respond)
2017     $blankname=hash('sha1',$_GET['url']).'.gif';
2018     if (is_file($cacheDir .'/'. $blankname))
2019     {
2020         header('Content-Type: image/gif');
2021         echo file_get_contents($cacheDir .'/'. $blankname);
2022         return;
2023     }
2024
2025     // Otherwise, generate the thumbnail.
2026     $url = $_GET['url'];
2027     $domain = parse_url($url,PHP_URL_HOST);
2028
2029     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2030     {
2031         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2032         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2033
2034         // Is this a link to an image, or to a flickr page ?
2035         $imageurl='';
2036         if (endsWith(parse_url($url, PHP_URL_PATH), '.jpg'))
2037         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2038             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2039             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2040         }
2041         else // This is a flickr page (html)
2042         {
2043             // Get the flickr html page.
2044             list($headers, $content) = get_http_response($url, 20);
2045             if (strpos($headers[0], '200 OK') !== false)
2046             {
2047                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2048                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2049                 if (!empty($matches[1])) $imageurl=$matches[1];
2050
2051                 // In albums (and some other pages), the link rel="image_src" is not provided,
2052                 // but flickr provides:
2053                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2054                 if ($imageurl=='')
2055                 {
2056                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2057                     if (!empty($matches[1])) $imageurl=$matches[1];
2058                 }
2059             }
2060         }
2061
2062         if ($imageurl!='')
2063         {   // Let's download the image.
2064             // Image is 240x120, so 10 seconds to download should be enough.
2065             list($headers, $content) = get_http_response($imageurl, 10);
2066             if (strpos($headers[0], '200 OK') !== false) {
2067                 // Save image to cache.
2068                 file_put_contents($cacheDir .'/'. $thumbname, $content);
2069                 header('Content-Type: image/jpeg');
2070                 echo $content;
2071                 return;
2072             }
2073         }
2074     }
2075
2076     elseif ($domain=='vimeo.com' )
2077     {
2078         // This is more complex: we have to perform a HTTP request, then parse the result.
2079         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2080         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2081         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2082         if (strpos($headers[0], '200 OK') !== false) {
2083             $t = unserialize($content);
2084             $imageurl = $t[0]['thumbnail_medium'];
2085             // Then we download the image and serve it to our client.
2086             list($headers, $content) = get_http_response($imageurl, 10);
2087             if (strpos($headers[0], '200 OK') !== false) {
2088                 // Save image to cache.
2089                 file_put_contents($cacheDir .'/'. $thumbname, $content);
2090                 header('Content-Type: image/jpeg');
2091                 echo $content;
2092                 return;
2093             }
2094         }
2095     }
2096
2097     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2098     {
2099         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2100         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2101         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2102         list($headers, $content) = get_http_response($url, 5);
2103         if (strpos($headers[0], '200 OK') !== false) {
2104             // Extract the link to the thumbnail
2105             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2106             if (!empty($matches[1]))
2107             {   // Let's download the image.
2108                 $imageurl=$matches[1];
2109                 // No control on image size, so wait long enough
2110                 list($headers, $content) = get_http_response($imageurl, 20);
2111                 if (strpos($headers[0], '200 OK') !== false) {
2112                     $filepath = $cacheDir .'/'. $thumbname;
2113                     file_put_contents($filepath, $content); // Save image to cache.
2114                     if (resizeImage($filepath))
2115                     {
2116                         header('Content-Type: image/jpeg');
2117                         echo file_get_contents($filepath);
2118                         return;
2119                     }
2120                 }
2121             }
2122         }
2123     }
2124
2125     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2126     {
2127         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2128         // http://xkcd.com/327/
2129         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2130         list($headers, $content) = get_http_response($url, 5);
2131         if (strpos($headers[0], '200 OK') !== false) {
2132             // Extract the link to the thumbnail
2133             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2134             if (!empty($matches[1]))
2135             {   // Let's download the image.
2136                 $imageurl=$matches[1];
2137                 // No control on image size, so wait long enough
2138                 list($headers, $content) = get_http_response($imageurl, 20);
2139                 if (strpos($headers[0], '200 OK') !== false) {
2140                     $filepath = $cacheDir.'/'.$thumbname;
2141                     // Save image to cache.
2142                     file_put_contents($filepath, $content);
2143                     if (resizeImage($filepath))
2144                     {
2145                         header('Content-Type: image/jpeg');
2146                         echo file_get_contents($filepath);
2147                         return;
2148                     }
2149                 }
2150             }
2151         }
2152     }
2153
2154     else
2155     {
2156         // For all other domains, we try to download the image and make a thumbnail.
2157         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2158         list($headers, $content) = get_http_response($url, 30);
2159         if (strpos($headers[0], '200 OK') !== false) {
2160             $filepath = $cacheDir .'/'.$thumbname;
2161             // Save image to cache.
2162             file_put_contents($filepath, $content);
2163             if (resizeImage($filepath))
2164             {
2165                 header('Content-Type: image/jpeg');
2166                 echo file_get_contents($filepath);
2167                 return;
2168             }
2169         }
2170     }
2171
2172
2173     // Otherwise, return an empty image (8x8 transparent gif)
2174     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2175     // Also put something in cache so that this URL is not requested twice.
2176     file_put_contents($cacheDir .'/'. $blankname, $blankgif);
2177     header('Content-Type: image/gif');
2178     echo $blankgif;
2179 }
2180
2181 // Make a thumbnail of the image (to width: 120 pixels)
2182 // Returns true if success, false otherwise.
2183 function resizeImage($filepath)
2184 {
2185     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2186
2187     // Trick: some stupid people rename GIF as JPEG... or else.
2188     // So we really try to open each image type whatever the extension is.
2189     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2190     $im=false;
2191     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2192     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2193     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2194     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2195     $w = imagesx($im);
2196     $h = imagesy($im);
2197     $ystart = 0; $yheight=$h;
2198     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2199     $nw = 120;   // Desired width
2200     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2201     // Resize image:
2202     $im2 = imagecreatetruecolor($nw,$nh);
2203     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2204     imageinterlace($im2,true); // For progressive JPEG.
2205     $tempname=$filepath.'_TEMP.jpg';
2206     imagejpeg($im2, $tempname, 90);
2207     imagedestroy($im);
2208     imagedestroy($im2);
2209     unlink($filepath);
2210     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2211     return true;
2212 }
2213
2214 if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=genthumbnail')) { genThumbnail($conf); exit; }  // Thumbnail generation/cache does not need the link database.
2215 if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=dailyrss')) { showDailyRSS($conf); exit; }
2216 if (!isset($_SESSION['LINKS_PER_PAGE'])) {
2217     $_SESSION['LINKS_PER_PAGE'] = $conf->get('general.links_per_page', 20);
2218 }
2219 renderPage($conf, $pluginManager);