index.php

   1 <?php
   2 /**
   3  * Shaarli v0.8.0 - Shaare your links...
   4  *
   5  * The personal, minimalist, super-fast, database free, bookmarking service.
   6  *
   7  * Friendly fork by the Shaarli community:
   8  *  - https://github.com/shaarli/Shaarli
   9  *
  10  * Original project by sebsauvage.net:
  11  *  - http://sebsauvage.net/wiki/doku.php?id=php:shaarli
  12  *  - https://github.com/sebsauvage/Shaarli
  13  *
  14  * Licence: http://www.opensource.org/licenses/zlib-license.php
  15  *
  16  * Requires: PHP 5.3.x
  17  */
  18
  19 // Set 'UTC' as the default timezone if it is not defined in php.ini
  20 // See http://php.net/manual/en/datetime.configuration.php#ini.date.timezone
  21 if (date_default_timezone_get() == '') {
  22     date_default_timezone_set('UTC');
  23 }
  24
  25 /*
  26  * PHP configuration
  27  */
  28 define('shaarli_version', '0.8.0');
  29
  30 // http://server.com/x/shaarli --> /shaarli/
  31 define('WEB_PATH', substr($_SERVER['REQUEST_URI'], 0, 1+strrpos($_SERVER['REQUEST_URI'], '/', 0)));
  32
  33 // High execution time in case of problematic imports/exports.
  34 ini_set('max_input_time','60');
  35
  36 // Try to set max upload file size and read
  37 ini_set('memory_limit', '128M');
  38 ini_set('post_max_size', '16M');
  39 ini_set('upload_max_filesize', '16M');
  40
  41 // See all error except warnings
  42 error_reporting(E_ALL^E_WARNING);
  43 // See all errors (for debugging only)
  44 //error_reporting(-1);
  45
  46
  47 // 3rd-party libraries
  48 if (! file_exists(__DIR__ . '/vendor/autoload.php')) {
  49     header('Content-Type: text/plain; charset=utf-8');
  50     echo "Error: missing Composer configuration\n\n"
  51         ."If you installed Shaarli through Git or using the development branch,\n"
  52         ."please refer to the installation documentation to install PHP"
  53         ." dependencies using Composer:\n"
  54         ."- https://github.com/shaarli/Shaarli/wiki/Server-requirements\n"
  55         ."- https://github.com/shaarli/Shaarli/wiki/Download-and-Installation";
  56     exit;
  57 }
  58 require_once 'inc/rain.tpl.class.php';
  59 require_once __DIR__ . '/vendor/autoload.php';
  60
  61 // Shaarli library
  62 require_once 'application/ApplicationUtils.php';
  63 require_once 'application/Cache.php';
  64 require_once 'application/CachedPage.php';
  65 require_once 'application/config/ConfigManager.php';
  66 require_once 'application/config/ConfigPlugin.php';
  67 require_once 'application/FeedBuilder.php';
  68 require_once 'application/FileUtils.php';
  69 require_once 'application/HttpUtils.php';
  70 require_once 'application/Languages.php';
  71 require_once 'application/LinkDB.php';
  72 require_once 'application/LinkFilter.php';
  73 require_once 'application/LinkUtils.php';
  74 require_once 'application/NetscapeBookmarkUtils.php';
  75 require_once 'application/PageBuilder.php';
  76 require_once 'application/TimeZone.php';
  77 require_once 'application/Url.php';
  78 require_once 'application/Utils.php';
  79 require_once 'application/PluginManager.php';
  80 require_once 'application/Router.php';
  81 require_once 'application/Updater.php';
  82
  83 // Ensure the PHP version is supported
  84 try {
  85     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
  86 } catch(Exception $exc) {
  87     header('Content-Type: text/plain; charset=utf-8');
  88     echo $exc->getMessage();
  89     exit;
  90 }
  91
  92 // Force cookie path (but do not change lifetime)
  93 $cookie = session_get_cookie_params();
  94 $cookiedir = '';
  95 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
  96     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
  97 }
  98 // Set default cookie expiration and path.
  99 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 100 // Set session parameters on server side.
 101 // If the user does not access any page within this time, his/her session is considered expired.
 102 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 103 // Use cookies to store session.
 104 ini_set('session.use_cookies', 1);
 105 // Force cookies for session (phpsessionID forbidden in URL).
 106 ini_set('session.use_only_cookies', 1);
 107 // Prevent PHP form using sessionID in URL if cookies are disabled.
 108 ini_set('session.use_trans_sid', false);
 109
 110 session_name('shaarli');
 111 // Start session if needed (Some server auto-start sessions).
 112 if (session_id() == '') {
 113     session_start();
 114 }
 115
 116 // Regenerate session ID if invalid or not defined in cookie.
 117 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 118     session_regenerate_id(true);
 119     $_COOKIE['shaarli'] = session_id();
 120 }
 121
 122 $conf = new ConfigManager();
 123 $conf->setEmpty('general.timezone', date_default_timezone_get());
 124 $conf->setEmpty('general.title', 'Shared links on '. escape(index_url($_SERVER)));
 125 RainTPL::$tpl_dir = $conf->get('resource.raintpl_tpl'); // template directory
 126 RainTPL::$cache_dir = $conf->get('resource.raintpl_tmp'); // cache directory
 127
 128 $pluginManager = new PluginManager($conf);
 129 $pluginManager->load($conf->get('general.enabled_plugins'));
 130
 131 date_default_timezone_set($conf->get('general.timezone', 'UTC'));
 132
 133 ob_start();  // Output buffering for the page cache.
 134
 135 // In case stupid admin has left magic_quotes enabled in php.ini:
 136 if (get_magic_quotes_gpc())
 137 {
 138     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 139     $_POST = array_map('stripslashes_deep', $_POST);
 140     $_GET = array_map('stripslashes_deep', $_GET);
 141     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 142 }
 143
 144 // Prevent caching on client side or proxy: (yes, it's ugly)
 145 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 146 header("Cache-Control: no-store, no-cache, must-revalidate");
 147 header("Cache-Control: post-check=0, pre-check=0", false);
 148 header("Pragma: no-cache");
 149
 150 if (! is_file($conf->getConfigFileExt())) {
 151     // Ensure Shaarli has proper access to its resources
 152     $errors = ApplicationUtils::checkResourcePermissions($conf);
 153
 154     if ($errors != array()) {
 155         $message = '<p>Insufficient permissions:</p><ul>';
 156
 157         foreach ($errors as $error) {
 158             $message .= '<li>'.$error.'</li>';
 159         }
 160         $message .= '</ul>';
 161
 162         header('Content-Type: text/html; charset=utf-8');
 163         echo $message;
 164         exit;
 165     }
 166
 167     // Display the installation form if no existing config is found
 168     install($conf);
 169 }
 170
 171 // a token depending of deployment salt, user password, and the current ip
 172 define('STAY_SIGNED_IN_TOKEN', sha1($conf->get('credentials.hash') . $_SERVER['REMOTE_ADDR'] . $conf->get('credentials.salt')));
 173
 174 // Sniff browser language and set date format accordingly.
 175 if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
 176     autoLocale($_SERVER['HTTP_ACCEPT_LANGUAGE']);
 177 }
 178 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 179
 180 /**
 181  * Checking session state (i.e. is the user still logged in)
 182  *
 183  * @param ConfigManager $conf The configuration manager.
 184  *
 185  * @return bool: true if the user is logged in, false otherwise.
 186  */
 187 function setup_login_state($conf)
 188 {
 189         if ($conf->get('security.open_shaarli')) {
 190             return true;
 191         }
 192         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 193         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 194         if (! $conf->exists('credentials.login')) {
 195             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 196             $loginFailure = true;
 197         }
 198         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 199             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 200             !$loginFailure)
 201         {
 202             fillSessionInfo($conf);
 203             $userIsLoggedIn = true;
 204         }
 205         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 206         if (empty($_SESSION['uid'])
 207         || ($conf->get('security.session_protection_disabled') == false && $_SESSION['ip'] != allIPs())
 208         || time() >= $_SESSION['expires_on'])
 209         {
 210             logout();
 211             $userIsLoggedIn = false;
 212             $loginFailure = true;
 213         }
 214         if (!empty($_SESSION['longlastingsession'])) {
 215             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 216         }
 217         else {
 218             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 219         }
 220         if (!$loginFailure) {
 221             $userIsLoggedIn = true;
 222         }
 223
 224         return $userIsLoggedIn;
 225 }
 226 $userIsLoggedIn = setup_login_state($conf);
 227
 228 /**
 229  * PubSubHubbub protocol support (if enabled)  [UNTESTED]
 230  * (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 231  *
 232  * @param ConfigManager $conf Configuration Manager instance.
 233  */
 234 function pubsubhub($conf)
 235 {
 236     $pshUrl = $conf->get('config.PUBSUBHUB_URL');
 237     if (!empty($pshUrl))
 238     {
 239         include_once './publisher.php';
 240         $p = new Publisher($pshUrl);
 241         $topic_url = array (
 242             index_url($_SERVER).'?do=atom',
 243             index_url($_SERVER).'?do=rss'
 244         );
 245         $p->publish_update($topic_url);
 246     }
 247 }
 248
 249 // ------------------------------------------------------------------------------------------
 250 // Session management
 251
 252 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 253 function allIPs()
 254 {
 255     $ip = $_SERVER['REMOTE_ADDR'];
 256     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 257     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 258     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 259     return $ip;
 260 }
 261
 262 /**
 263  * Load user session.
 264  *
 265  * @param ConfigManager $conf Configuration Manager instance.
 266  */
 267 function fillSessionInfo($conf)
 268 {
 269         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 270         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 271         $_SESSION['username']= $conf->get('credentials.login');
 272         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 273 }
 274
 275 /**
 276  * Check that user/password is correct.
 277  *
 278  * @param string        $login    Username
 279  * @param string        $password User password
 280  * @param ConfigManager $conf     Configuration Manager instance.
 281  *
 282  * @return bool: authentication successful or not.
 283  */
 284 function check_auth($login, $password, $conf)
 285 {
 286     $hash = sha1($password . $login . $conf->get('credentials.salt'));
 287     if ($login == $conf->get('credentials.login') && $hash == $conf->get('credentials.hash'))
 288     {   // Login/password is correct.
 289                 fillSessionInfo($conf);
 290         logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Login successful');
 291         return true;
 292     }
 293     logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Login failed for user '.$login);
 294     return false;
 295 }
 296
 297 // Returns true if the user is logged in.
 298 function isLoggedIn()
 299 {
 300     global $userIsLoggedIn;
 301     return $userIsLoggedIn;
 302 }
 303
 304 // Force logout.
 305 function logout() {
 306     if (isset($_SESSION)) {
 307         unset($_SESSION['uid']);
 308         unset($_SESSION['ip']);
 309         unset($_SESSION['username']);
 310         unset($_SESSION['privateonly']);
 311     }
 312     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 313 }
 314
 315
 316 // ------------------------------------------------------------------------------------------
 317 // Brute force protection system
 318 // Several consecutive failed logins will ban the IP address for 30 minutes.
 319 if (!is_file($conf->get('resource.ban_file', 'data/ipbans.php'))) {
 320     // FIXME! globals
 321     file_put_contents(
 322         $conf->get('resource.ban_file', 'data/ipbans.php'),
 323         "<?php\n\$GLOBALS['IPBANS']=".var_export(array('FAILURES'=>array(),'BANS'=>array()),true).";\n?>"
 324     );
 325 }
 326 include $conf->get('resource.ban_file', 'data/ipbans.php');
 327 /**
 328  * Signal a failed login. Will ban the IP if too many failures:
 329  *
 330  * @param ConfigManager $conf Configuration Manager instance.
 331  */
 332 function ban_loginFailed($conf)
 333 {
 334     $ip = $_SERVER['REMOTE_ADDR'];
 335     $trusted = $conf->get('security.trusted_proxies', array());
 336     if (in_array($ip, $trusted)) {
 337         $ip = getIpAddressFromProxy($_SERVER, $trusted);
 338         if (!$ip) {
 339             return;
 340         }
 341     }
 342     $gb = $GLOBALS['IPBANS'];
 343     if (! isset($gb['FAILURES'][$ip])) {
 344         $gb['FAILURES'][$ip]=0;
 345     }
 346     $gb['FAILURES'][$ip]++;
 347     if ($gb['FAILURES'][$ip] > ($conf->get('security.ban_after') - 1))
 348     {
 349         $gb['BANS'][$ip] = time() + $conf->get('security.ban_after', 1800);
 350         logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'IP address banned from login');
 351     }
 352     $GLOBALS['IPBANS'] = $gb;
 353     file_put_contents(
 354         $conf->get('resource.ban_file', 'data/ipbans.php'),
 355         "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 356     );
 357 }
 358
 359 /**
 360  * Signals a successful login. Resets failed login counter.
 361  *
 362  * @param ConfigManager $conf Configuration Manager instance.
 363  */
 364 function ban_loginOk($conf)
 365 {
 366     $ip = $_SERVER['REMOTE_ADDR'];
 367     $gb = $GLOBALS['IPBANS'];
 368     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 369     $GLOBALS['IPBANS'] = $gb;
 370     file_put_contents(
 371         $conf->get('resource.ban_file', 'data/ipbans.php'),
 372         "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 373     );
 374 }
 375
 376 /**
 377  * Checks if the user CAN login. If 'true', the user can try to login.
 378  *
 379  * @param ConfigManager $conf Configuration Manager instance.
 380  *
 381  * @return bool: true if the user is allowed to login.
 382  */
 383 function ban_canLogin($conf)
 384 {
 385     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 386     if (isset($gb['BANS'][$ip]))
 387     {
 388         // User is banned. Check if the ban has expired:
 389         if ($gb['BANS'][$ip]<=time())
 390         {   // Ban expired, user can try to login again.
 391             logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Ban lifted.');
 392             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 393             file_put_contents(
 394                 $conf->get('resource.ban_file', 'data/ipbans.php'),
 395                 "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 396             );
 397             return true; // Ban has expired, user can login.
 398         }
 399         return false; // User is banned.
 400     }
 401     return true; // User is not banned.
 402 }
 403
 404 // ------------------------------------------------------------------------------------------
 405 // Process login form: Check if login/password is correct.
 406 if (isset($_POST['login']))
 407 {
 408     if (!ban_canLogin($conf)) die('I said: NO. You are banned for the moment. Go away.');
 409     if (isset($_POST['password'])
 410         && tokenOk($_POST['token'])
 411         && (check_auth($_POST['login'], $_POST['password'], $conf))
 412     ) {   // Login/password is OK.
 413         ban_loginOk($conf);
 414         // If user wants to keep the session cookie even after the browser closes:
 415         if (!empty($_POST['longlastingsession']))
 416         {
 417                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 418             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 419             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 420
 421             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 422             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 423             // Note: Never forget the trailing slash on the cookie path!
 424             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 425         }
 426         else // Standard session expiration (=when browser closes)
 427         {
 428             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 429             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 430             session_regenerate_id(true);
 431         }
 432
 433         // Optional redirect after login:
 434         if (isset($_GET['post'])) {
 435             $uri = '?post='. urlencode($_GET['post']);
 436             foreach (array('description', 'source', 'title') as $param) {
 437                 if (!empty($_GET[$param])) {
 438                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 439                 }
 440             }
 441             header('Location: '. $uri);
 442             exit;
 443         }
 444
 445         if (isset($_GET['edit_link'])) {
 446             header('Location: ?edit_link='. escape($_GET['edit_link']));
 447             exit;
 448         }
 449
 450         if (isset($_POST['returnurl'])) {
 451             // Prevent loops over login screen.
 452             if (strpos($_POST['returnurl'], 'do=login') === false) {
 453                 header('Location: '. generateLocation($_POST['returnurl'], $_SERVER['HTTP_HOST']));
 454                 exit;
 455             }
 456         }
 457         header('Location: ?'); exit;
 458     }
 459     else
 460     {
 461         ban_loginFailed($conf);
 462         $redir = '&username='. $_POST['login'];
 463         if (isset($_GET['post'])) {
 464             $redir .= '&post=' . urlencode($_GET['post']);
 465             foreach (array('description', 'source', 'title') as $param) {
 466                 if (!empty($_GET[$param])) {
 467                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 468                 }
 469             }
 470         }
 471         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 472         exit;
 473     }
 474 }
 475
 476 // ------------------------------------------------------------------------------------------
 477 // Misc utility functions:
 478
 479 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 480 function return_bytes($val)
 481 {
 482     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 483     switch($last)
 484     {
 485         case 'g': $val *= 1024;
 486         case 'm': $val *= 1024;
 487         case 'k': $val *= 1024;
 488     }
 489     return $val;
 490 }
 491
 492 // Try to determine max file size for uploads (POST).
 493 // Returns an integer (in bytes)
 494 function getMaxFileSize()
 495 {
 496     $size1 = return_bytes(ini_get('post_max_size'));
 497     $size2 = return_bytes(ini_get('upload_max_filesize'));
 498     // Return the smaller of two:
 499     $maxsize = min($size1,$size2);
 500     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 501     return $maxsize;
 502 }
 503
 504 // ------------------------------------------------------------------------------------------
 505 // Token management for XSRF protection
 506 // Token should be used in any form which acts on data (create,update,delete,import...).
 507 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 508
 509 /**
 510  * Returns a token.
 511  *
 512  * @param ConfigManager $conf Configuration Manager instance.
 513  *
 514  * @return string token.
 515  */
 516 function getToken($conf)
 517 {
 518     $rnd = sha1(uniqid('', true) .'_'. mt_rand() . $conf->get('credentials.salt'));  // We generate a random string.
 519     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 520     return $rnd;
 521 }
 522
 523 // Tells if a token is OK. Using this function will destroy the token.
 524 // true=token is OK.
 525 function tokenOk($token)
 526 {
 527     if (isset($_SESSION['tokens'][$token]))
 528     {
 529         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 530         return true; // Token is OK.
 531     }
 532     return false; // Wrong token, or already used.
 533 }
 534
 535 /**
 536  * Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 537  * Gives the last 7 days (which have links).
 538  * This RSS feed cannot be filtered.
 539  *
 540  * @param ConfigManager $conf Configuration Manager instance.
 541  */
 542 function showDailyRSS($conf) {
 543     // Cache system
 544     $query = $_SERVER['QUERY_STRING'];
 545     $cache = new CachedPage(
 546         $conf->get('config.PAGE_CACHE'),
 547         page_url($_SERVER),
 548         startsWith($query,'do=dailyrss') && !isLoggedIn()
 549     );
 550     $cached = $cache->cachedVersion();
 551     if (!empty($cached)) {
 552         echo $cached;
 553         exit;
 554     }
 555
 556     // If cached was not found (or not usable), then read the database and build the response:
 557     // Read links from database (and filter private links if used it not logged in).
 558     $LINKSDB = new LinkDB(
 559         $conf->get('resource.datastore'),
 560         isLoggedIn(),
 561         $conf->get('privacy.hide_public_links'),
 562         $conf->get('redirector.url'),
 563         $conf->get('redirector.encode_url')
 564     );
 565
 566     /* Some Shaarlies may have very few links, so we need to look
 567        back in time until we have enough days ($nb_of_days).
 568     */
 569     $ids = array();
 570     foreach ($LINKSDB as $id => $value) {
 571         $ids[] = $id;
 572     }
 573     $nb_of_days = 7; // We take 7 days.
 574     $today = date('Ymd');
 575     $days = array();
 576
 577     foreach ($ids as $id) {
 578         $day = $LINKSDB[$id]['created']->format('Ymd'); // Extract day (without time)
 579         if (strcmp($day, $today) < 0) {
 580             if (empty($days[$day])) {
 581                 $days[$day] = array();
 582             }
 583             $days[$day][] = $id;
 584         }
 585
 586         if (count($days) > $nb_of_days) {
 587             break; // Have we collected enough days?
 588         }
 589     }
 590
 591     // Build the RSS feed.
 592     header('Content-Type: application/rss+xml; charset=utf-8');
 593     $pageaddr = escape(index_url($_SERVER));
 594     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 595     echo '<channel>';
 596     echo '<title>Daily - '. $conf->get('general.title') . '</title>';
 597     echo '<link>'. $pageaddr .'</link>';
 598     echo '<description>Daily shared links</description>';
 599     echo '<language>en-en</language>';
 600     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 601
 602     // For each day.
 603     foreach ($days as $day => $ids) {
 604         $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 605         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 606
 607         // Build the HTML body of this RSS entry.
 608         $links = array();
 609
 610         // We pre-format some fields for proper output.
 611         foreach ($ids as $id) {
 612             $l = $LINKSDB[$id];
 613             $l['formatedDescription'] = format_description($l['description'], $conf->get('redirector.url'));
 614             $l['thumbnail'] = thumbnail($conf, $l['url']);
 615             $l['timestamp'] = $l['created']->getTimestamp();
 616             if (startsWith($l['url'], '?')) {
 617                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 618             }
 619             $links[$id] = $l;
 620         }
 621
 622         // Then build the HTML for this day:
 623         $tpl = new RainTPL;
 624         $tpl->assign('title', $conf->get('general.title'));
 625         $tpl->assign('daydate', $dayDate->getTimestamp());
 626         $tpl->assign('absurl', $absurl);
 627         $tpl->assign('links', $links);
 628         $tpl->assign('rssdate', escape($dayDate->format(DateTime::RSS)));
 629         $tpl->assign('hide_timestamps', $conf->get('privacy.hide_timestamps', false));
 630         $html = $tpl->draw('dailyrss', $return_string=true);
 631
 632         echo $html . PHP_EOL;
 633     }
 634     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
 635
 636     $cache->cache(ob_get_contents());
 637     ob_end_flush();
 638     exit;
 639 }
 640
 641 /**
 642  * Show the 'Daily' page.
 643  *
 644  * @param PageBuilder   $pageBuilder   Template engine wrapper.
 645  * @param LinkDB        $LINKSDB       LinkDB instance.
 646  * @param ConfigManager $conf          Configuration Manager instance.
 647  * @param PluginManager $pluginManager Plugin Manager instane.
 648  */
 649 function showDaily($pageBuilder, $LINKSDB, $conf, $pluginManager)
 650 {
 651     $day=date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 652     if (isset($_GET['day'])) $day=$_GET['day'];
 653
 654     $days = $LINKSDB->days();
 655     $i = array_search($day,$days);
 656     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
 657     $previousday='';
 658     $nextday='';
 659     if ($i!==false)
 660     {
 661         if ($i>=1) $previousday=$days[$i-1];
 662         if ($i<count($days)-1) $nextday=$days[$i+1];
 663     }
 664
 665     try {
 666         $linksToDisplay = $LINKSDB->filterDay($day);
 667     } catch (Exception $exc) {
 668         error_log($exc);
 669         $linksToDisplay = array();
 670     }
 671
 672     // We pre-format some fields for proper output.
 673     foreach($linksToDisplay as $key=>$link)
 674     {
 675
 676         $taglist = explode(' ',$link['tags']);
 677         uasort($taglist, 'strcasecmp');
 678         $linksToDisplay[$key]['shorturl'] = smallHash($link['created']->format('Ymd_His'));
 679         $linksToDisplay[$key]['taglist']=$taglist;
 680         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $conf->get('redirector.url'));
 681         $linksToDisplay[$key]['thumbnail'] = thumbnail($conf, $link['url']);
 682         $linksToDisplay[$key]['timestamp'] =  $link['created']->getTimestamp();
 683     }
 684
 685     /* We need to spread the articles on 3 columns.
 686        I did not want to use a JavaScript lib like http://masonry.desandro.com/
 687        so I manually spread entries with a simple method: I roughly evaluate the
 688        height of a div according to title and description length.
 689     */
 690     $columns=array(array(),array(),array()); // Entries to display, for each column.
 691     $fill=array(0,0,0);  // Rough estimate of columns fill.
 692     foreach($linksToDisplay as $key=>$link)
 693     {
 694         // Roughly estimate length of entry (by counting characters)
 695         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
 696         // Description: 836 characters gives roughly 342 pixel height.
 697         // This is not perfect, but it's usually OK.
 698         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
 699         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
 700         // Then put in column which is the less filled:
 701         $smallest=min($fill); // find smallest value in array.
 702         $index=array_search($smallest,$fill); // find index of this smallest value.
 703         array_push($columns[$index],$link); // Put entry in this column.
 704         $fill[$index]+=$length;
 705     }
 706
 707     $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 708     $data = array(
 709         'linksToDisplay' => $linksToDisplay,
 710         'cols' => $columns,
 711         'day' => $dayDate->getTimestamp(),
 712         'previousday' => $previousday,
 713         'nextday' => $nextday,
 714     );
 715
 716     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
 717
 718     foreach ($data as $key => $value) {
 719         $pageBuilder->assign($key, $value);
 720     }
 721
 722     $pageBuilder->renderPage('daily');
 723     exit;
 724 }
 725
 726 /**
 727  * Renders the linklist
 728  *
 729  * @param pageBuilder   $PAGE    pageBuilder instance.
 730  * @param LinkDB        $LINKSDB LinkDB instance.
 731  * @param ConfigManager $conf    Configuration Manager instance.
 732  * @param PluginManager $pluginManager Plugin Manager instance.
 733  */
 734 function showLinkList($PAGE, $LINKSDB, $conf, $pluginManager) {
 735     buildLinkList($PAGE,$LINKSDB, $conf, $pluginManager); // Compute list of links to display
 736     $PAGE->renderPage('linklist');
 737 }
 738
 739 /**
 740  * Render HTML page (according to URL parameters and user rights)
 741  *
 742  * @param ConfigManager $conf          Configuration Manager instance.
 743  * @param PluginManager $pluginManager Plugin Manager instance,
 744  */
 745 function renderPage($conf, $pluginManager)
 746 {
 747     $LINKSDB = new LinkDB(
 748         $conf->get('resource.datastore'),
 749         isLoggedIn(),
 750         $conf->get('privacy.hide_public_links'),
 751         $conf->get('redirector.url'),
 752         $conf->get('redirector.encode_url')
 753     );
 754
 755     $updater = new Updater(
 756         read_updates_file($conf->get('resource.updates')),
 757         $LINKSDB,
 758         $conf,
 759         isLoggedIn()
 760     );
 761     try {
 762         $newUpdates = $updater->update();
 763         if (! empty($newUpdates)) {
 764             write_updates_file(
 765                 $conf->get('resource.updates'),
 766                 $updater->getDoneUpdates()
 767             );
 768         }
 769     }
 770     catch(Exception $e) {
 771         die($e->getMessage());
 772     }
 773
 774     $PAGE = new PageBuilder($conf);
 775     $PAGE->assign('linkcount', count($LINKSDB));
 776     $PAGE->assign('privateLinkcount', count_private($LINKSDB));
 777     $PAGE->assign('plugin_errors', $pluginManager->getErrors());
 778
 779     // Determine which page will be rendered.
 780     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
 781     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
 782
 783     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
 784     // Then assign generated data to RainTPL.
 785     $common_hooks = array(
 786         'includes',
 787         'header',
 788         'footer',
 789     );
 790
 791     foreach($common_hooks as $name) {
 792         $plugin_data = array();
 793         $pluginManager->executeHooks('render_' . $name, $plugin_data,
 794             array(
 795                 'target' => $targetPage,
 796                 'loggedin' => isLoggedIn()
 797             )
 798         );
 799         $PAGE->assign('plugins_' . $name, $plugin_data);
 800     }
 801
 802     // -------- Display login form.
 803     if ($targetPage == Router::$PAGE_LOGIN)
 804     {
 805         if ($conf->get('security.open_shaarli')) { header('Location: ?'); exit; }  // No need to login for open Shaarli
 806         if (isset($_GET['username'])) {
 807             $PAGE->assign('username', escape($_GET['username']));
 808         }
 809         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
 810         $PAGE->renderPage('loginform');
 811         exit;
 812     }
 813     // -------- User wants to logout.
 814     if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=logout'))
 815     {
 816         invalidateCaches($conf->get('resource.page_cache'));
 817         logout();
 818         header('Location: ?');
 819         exit;
 820     }
 821
 822     // -------- Picture wall
 823     if ($targetPage == Router::$PAGE_PICWALL)
 824     {
 825         // Optionally filter the results:
 826         $links = $LINKSDB->filterSearch($_GET);
 827         $linksToDisplay = array();
 828
 829         // Get only links which have a thumbnail.
 830         foreach($links as $link)
 831         {
 832             $permalink='?'.escape(smallHash($link['created']->format('Ymd_His')));
 833             $thumb=lazyThumbnail($conf, $link['url'],$permalink);
 834             if ($thumb!='') // Only output links which have a thumbnail.
 835             {
 836                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
 837                 $linksToDisplay[]=$link; // Add to array.
 838             }
 839         }
 840
 841         $data = array(
 842             'linksToDisplay' => $linksToDisplay,
 843         );
 844         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
 845
 846         foreach ($data as $key => $value) {
 847             $PAGE->assign($key, $value);
 848         }
 849
 850         $PAGE->renderPage('picwall');
 851         exit;
 852     }
 853
 854     // -------- Tag cloud
 855     if ($targetPage == Router::$PAGE_TAGCLOUD)
 856     {
 857         $tags= $LINKSDB->allTags();
 858
 859         // We sort tags alphabetically, then choose a font size according to count.
 860         // First, find max value.
 861         $maxcount = 0;
 862         foreach ($tags as $value) {
 863             $maxcount = max($maxcount, $value);
 864         }
 865
 866         // Sort tags alphabetically: case insensitive, support locale if available.
 867         uksort($tags, function($a, $b) {
 868             // Collator is part of PHP intl.
 869             if (class_exists('Collator')) {
 870                 $c = new Collator(setlocale(LC_COLLATE, 0));
 871                 if (!intl_is_failure(intl_get_error_code())) {
 872                     return $c->compare($a, $b);
 873                 }
 874             }
 875             return strcasecmp($a, $b);
 876         });
 877
 878         $tagList = array();
 879         foreach($tags as $key => $value) {
 880             // Tag font size scaling:
 881             //   default 15 and 30 logarithm bases affect scaling,
 882             //   22 and 6 are arbitrary font sizes for max and min sizes.
 883             $size = log($value, 15) / log($maxcount, 30) * 2.2 + 0.8;
 884             $tagList[$key] = array(
 885                 'count' => $value,
 886                 'size' => number_format($size, 2, '.', ''),
 887             );
 888         }
 889
 890         $data = array(
 891             'tags' => $tagList,
 892         );
 893         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
 894
 895         foreach ($data as $key => $value) {
 896             $PAGE->assign($key, $value);
 897         }
 898
 899         $PAGE->renderPage('tagcloud');
 900         exit;
 901     }
 902
 903     // Daily page.
 904     if ($targetPage == Router::$PAGE_DAILY) {
 905         showDaily($PAGE, $LINKSDB, $conf, $pluginManager);
 906     }
 907
 908     // ATOM and RSS feed.
 909     if ($targetPage == Router::$PAGE_FEED_ATOM || $targetPage == Router::$PAGE_FEED_RSS) {
 910         $feedType = $targetPage == Router::$PAGE_FEED_RSS ? FeedBuilder::$FEED_RSS : FeedBuilder::$FEED_ATOM;
 911         header('Content-Type: application/'. $feedType .'+xml; charset=utf-8');
 912
 913         // Cache system
 914         $query = $_SERVER['QUERY_STRING'];
 915         $cache = new CachedPage(
 916             $conf->get('resource.page_cache'),
 917             page_url($_SERVER),
 918             startsWith($query,'do='. $targetPage) && !isLoggedIn()
 919         );
 920         $cached = $cache->cachedVersion();
 921         if (!empty($cached)) {
 922             echo $cached;
 923             exit;
 924         }
 925
 926         // Generate data.
 927         $feedGenerator = new FeedBuilder($LINKSDB, $feedType, $_SERVER, $_GET, isLoggedIn());
 928         $feedGenerator->setLocale(strtolower(setlocale(LC_COLLATE, 0)));
 929         $feedGenerator->setHideDates($conf->get('privacy.hide_timestamps') && !isLoggedIn());
 930         $feedGenerator->setUsePermalinks(isset($_GET['permalinks']) || !$conf->get('feed.rss_permalinks'));
 931         $pshUrl = $conf->get('config.PUBSUBHUB_URL');
 932         if (!empty($pshUrl)) {
 933             $feedGenerator->setPubsubhubUrl($pshUrl);
 934         }
 935         $data = $feedGenerator->buildData();
 936
 937         // Process plugin hook.
 938         $pluginManager->executeHooks('render_feed', $data, array(
 939             'loggedin' => isLoggedIn(),
 940             'target' => $targetPage,
 941         ));
 942
 943         // Render the template.
 944         $PAGE->assignAll($data);
 945         $PAGE->renderPage('feed.'. $feedType);
 946         $cache->cache(ob_get_contents());
 947         ob_end_flush();
 948         exit;
 949     }
 950
 951     // Display openseach plugin (XML)
 952     if ($targetPage == Router::$PAGE_OPENSEARCH) {
 953         header('Content-Type: application/xml; charset=utf-8');
 954         $PAGE->assign('serverurl', index_url($_SERVER));
 955         $PAGE->renderPage('opensearch');
 956         exit;
 957     }
 958
 959     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
 960     if (isset($_GET['addtag']))
 961     {
 962         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
 963         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
 964         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
 965
 966         // Prevent redirection loop
 967         if (isset($params['addtag'])) {
 968             unset($params['addtag']);
 969         }
 970
 971         // Check if this tag is already in the search query and ignore it if it is.
 972         // Each tag is always separated by a space
 973         if (isset($params['searchtags'])) {
 974             $current_tags = explode(' ', $params['searchtags']);
 975         } else {
 976             $current_tags = array();
 977         }
 978         $addtag = true;
 979         foreach ($current_tags as $value) {
 980             if ($value === $_GET['addtag']) {
 981                 $addtag = false;
 982                 break;
 983             }
 984         }
 985         // Append the tag if necessary
 986         if (empty($params['searchtags'])) {
 987             $params['searchtags'] = trim($_GET['addtag']);
 988         }
 989         else if ($addtag) {
 990             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
 991         }
 992
 993         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
 994         header('Location: ?'.http_build_query($params));
 995         exit;
 996     }
 997
 998     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
 999     if (isset($_GET['removetag'])) {
1000         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1001         if (empty($_SERVER['HTTP_REFERER'])) {
1002             header('Location: ?');
1003             exit;
1004         }
1005
1006         // In case browser does not send HTTP_REFERER
1007         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1008
1009         // Prevent redirection loop
1010         if (isset($params['removetag'])) {
1011             unset($params['removetag']);
1012         }
1013
1014         if (isset($params['searchtags'])) {
1015             $tags = explode(' ', $params['searchtags']);
1016             // Remove value from array $tags.
1017             $tags = array_diff($tags, array($_GET['removetag']));
1018             $params['searchtags'] = implode(' ',$tags);
1019
1020             if (empty($params['searchtags'])) {
1021                 unset($params['searchtags']);
1022             }
1023
1024             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1025         }
1026         header('Location: ?'.http_build_query($params));
1027         exit;
1028     }
1029
1030     // -------- User wants to change the number of links per page (linksperpage=...)
1031     if (isset($_GET['linksperpage'])) {
1032         if (is_numeric($_GET['linksperpage'])) {
1033             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1034         }
1035
1036         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1037         exit;
1038     }
1039
1040     // -------- User wants to see only private links (toggle)
1041     if (isset($_GET['privateonly'])) {
1042         if (empty($_SESSION['privateonly'])) {
1043             $_SESSION['privateonly'] = 1; // See only private links
1044         } else {
1045             unset($_SESSION['privateonly']); // See all links
1046         }
1047
1048         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1049         exit;
1050     }
1051
1052     // -------- Handle other actions allowed for non-logged in users:
1053     if (!isLoggedIn())
1054     {
1055         // User tries to post new link but is not logged in:
1056         // Show login screen, then redirect to ?post=...
1057         if (isset($_GET['post']))
1058         {
1059             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1060             exit;
1061         }
1062
1063         showLinkList($PAGE, $LINKSDB, $conf, $pluginManager);
1064         if (isset($_GET['edit_link'])) {
1065             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1066             exit;
1067         }
1068
1069         exit; // Never remove this one! All operations below are reserved for logged in user.
1070     }
1071
1072     // -------- All other functions are reserved for the registered user:
1073
1074     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1075     if ($targetPage == Router::$PAGE_TOOLS)
1076     {
1077         $data = array(
1078             'pageabsaddr' => index_url($_SERVER),
1079             'sslenabled' => !empty($_SERVER['HTTPS'])
1080         );
1081         $pluginManager->executeHooks('render_tools', $data);
1082
1083         foreach ($data as $key => $value) {
1084             $PAGE->assign($key, $value);
1085         }
1086
1087         $PAGE->renderPage('tools');
1088         exit;
1089     }
1090
1091     // -------- User wants to change his/her password.
1092     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1093     {
1094         if ($conf->get('security.open_shaarli')) {
1095             die('You are not supposed to change a password on an Open Shaarli.');
1096         }
1097
1098         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1099         {
1100             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1101
1102             // Make sure old password is correct.
1103             $oldhash = sha1($_POST['oldpassword'].$conf->get('credentials.login').$conf->get('credentials.salt'));
1104             if ($oldhash!= $conf->get('credentials.hash')) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1105             // Save new password
1106             // Salt renders rainbow-tables attacks useless.
1107             $conf->set('credentials.salt', sha1(uniqid('', true) .'_'. mt_rand()));
1108             $conf->set('credentials.hash', sha1($_POST['setpassword'] . $conf->get('credentials.login') . $conf->get('credentials.salt')));
1109             try {
1110                 $conf->write(isLoggedIn());
1111             }
1112             catch(Exception $e) {
1113                 error_log(
1114                     'ERROR while writing config file after changing password.' . PHP_EOL .
1115                     $e->getMessage()
1116                 );
1117
1118                 // TODO: do not handle exceptions/errors in JS.
1119                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1120                 exit;
1121             }
1122             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1123             exit;
1124         }
1125         else // show the change password form.
1126         {
1127             $PAGE->renderPage('changepassword');
1128             exit;
1129         }
1130     }
1131
1132     // -------- User wants to change configuration
1133     if ($targetPage == Router::$PAGE_CONFIGURE)
1134     {
1135         if (!empty($_POST['title']) )
1136         {
1137             if (!tokenOk($_POST['token'])) {
1138                 die('Wrong token.'); // Go away!
1139             }
1140             $tz = 'UTC';
1141             if (!empty($_POST['continent']) && !empty($_POST['city'])
1142                 && isTimeZoneValid($_POST['continent'], $_POST['city'])
1143             ) {
1144                 $tz = $_POST['continent'] . '/' . $_POST['city'];
1145             }
1146             $conf->set('general.timezone', $tz);
1147             $conf->set('general.title', escape($_POST['title']));
1148             $conf->set('general.header_link', escape($_POST['titleLink']));
1149             $conf->set('redirector.url', escape($_POST['redirector']));
1150             $conf->set('security.session_protection_disabled', !empty($_POST['disablesessionprotection']));
1151             $conf->set('privacy.default_private_links', !empty($_POST['privateLinkByDefault']));
1152             $conf->set('feed.rss_permalinks', !empty($_POST['enableRssPermalinks']));
1153             $conf->set('updates.check_updates', !empty($_POST['updateCheck']));
1154             $conf->set('privacy.hide_public_links', !empty($_POST['hidePublicLinks']));
1155             try {
1156                 $conf->write(isLoggedIn());
1157             }
1158             catch(Exception $e) {
1159                 error_log(
1160                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1161                     $e->getMessage()
1162                 );
1163
1164                 // TODO: do not handle exceptions/errors in JS.
1165                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=configure\';</script>';
1166                 exit;
1167             }
1168             echo '<script>alert("Configuration was saved.");document.location=\'?do=configure\';</script>';
1169             exit;
1170         }
1171         else // Show the configuration form.
1172         {
1173             $PAGE->assign('title', $conf->get('general.title'));
1174             $PAGE->assign('redirector', $conf->get('redirector.url'));
1175             list($timezone_form, $timezone_js) = generateTimeZoneForm($conf->get('general.timezone'));
1176             $PAGE->assign('timezone_form', $timezone_form);
1177             $PAGE->assign('timezone_js',$timezone_js);
1178             $PAGE->assign('private_links_default', $conf->get('privacy.default_private_links', false));
1179             $PAGE->assign('session_protection_disabled', $conf->get('security.session_protection_disabled', false));
1180             $PAGE->assign('enable_rss_permalinks', $conf->get('feed.rss_permalinks', false));
1181             $PAGE->assign('enable_update_check', $conf->get('updates.check_updates', true));
1182             $PAGE->assign('hide_public_links', $conf->get('privacy.hide_public_links', false));
1183             $PAGE->renderPage('configure');
1184             exit;
1185         }
1186     }
1187
1188     // -------- User wants to rename a tag or delete it
1189     if ($targetPage == Router::$PAGE_CHANGETAG)
1190     {
1191         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1192             $PAGE->assign('tags', $LINKSDB->allTags());
1193             $PAGE->renderPage('changetag');
1194             exit;
1195         }
1196
1197         if (!tokenOk($_POST['token'])) {
1198             die('Wrong token.');
1199         }
1200
1201         // Delete a tag:
1202         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1203             $needle = trim($_POST['fromtag']);
1204             // True for case-sensitive tag search.
1205             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1206             foreach($linksToAlter as $key=>$value)
1207             {
1208                 $tags = explode(' ',trim($value['tags']));
1209                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1210                 $value['tags']=trim(implode(' ',$tags));
1211                 $LINKSDB[$key]=$value;
1212             }
1213             $LINKSDB->save($conf->get('resource.page_cache'));
1214             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1215             exit;
1216         }
1217
1218         // Rename a tag:
1219         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1220             $needle = trim($_POST['fromtag']);
1221             // True for case-sensitive tag search.
1222             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1223             foreach($linksToAlter as $key=>$value)
1224             {
1225                 $tags = explode(' ',trim($value['tags']));
1226                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1227                 $value['tags']=trim(implode(' ',$tags));
1228                 $LINKSDB[$key]=$value;
1229             }
1230             $LINKSDB->save($conf->get('resource.page_cache')); // Save to disk.
1231             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1232             exit;
1233         }
1234     }
1235
1236     // -------- User wants to add a link without using the bookmarklet: Show form.
1237     if ($targetPage == Router::$PAGE_ADDLINK)
1238     {
1239         $PAGE->renderPage('addlink');
1240         exit;
1241     }
1242
1243     // -------- User clicked the "Save" button when editing a link: Save link to database.
1244     if (isset($_POST['save_edit']))
1245     {
1246         // Go away!
1247         if (! tokenOk($_POST['token'])) {
1248             die('Wrong token.');
1249         }
1250
1251         // lf_id should only be present if the link exists.
1252         $id = !empty($_POST['lf_id']) ? (int) escape($_POST['lf_id']) : $LINKSDB->getNextId();
1253         // Linkdate is kept here to:
1254         //   - use the same permalink for notes as they're displayed when creating them
1255         //   - let users hack creation date of their posts
1256         //     See: https://github.com/shaarli/Shaarli/wiki/Datastore-hacks#changing-the-timestamp-for-a-link
1257         $linkdate = escape($_POST['lf_linkdate']);
1258         if (isset($LINKSDB[$id])) {
1259             // Edit
1260             $created = DateTime::createFromFormat('Ymd_His', $linkdate);
1261             $updated = new DateTime();
1262         } else {
1263             // New link
1264             $created = DateTime::createFromFormat('Ymd_His', $linkdate);
1265             $updated = null;
1266         }
1267
1268         // Remove multiple spaces.
1269         $tags = trim(preg_replace('/\s\s+/', ' ', $_POST['lf_tags']));
1270         // Remove first '-' char in tags.
1271         $tags = preg_replace('/(^| )\-/', '$1', $tags);
1272         // Remove duplicates.
1273         $tags = implode(' ', array_unique(explode(' ', $tags)));
1274
1275         $url = trim($_POST['lf_url']);
1276         if (! startsWith($url, 'http:') && ! startsWith($url, 'https:')
1277             && ! startsWith($url, 'ftp:') && ! startsWith($url, 'magnet:')
1278             && ! startsWith($url, '?') && ! startsWith($url, 'javascript:')
1279         ) {
1280             $url = 'http://' . $url;
1281         }
1282
1283         $link = array(
1284             'id' => $id,
1285             'title' => trim($_POST['lf_title']),
1286             'url' => $url,
1287             'description' => $_POST['lf_description'],
1288             'private' => (isset($_POST['lf_private']) ? 1 : 0),
1289             'created' => $created,
1290             'updated' => $updated,
1291             'tags' => str_replace(',', ' ', $tags)
1292         );
1293
1294         // If title is empty, use the URL as title.
1295         if ($link['title'] == '') {
1296             $link['title'] = $link['url'];
1297         }
1298
1299         $pluginManager->executeHooks('save_link', $link);
1300
1301         $LINKSDB[$id] = $link;
1302         $LINKSDB->save($conf->get('resource.page_cache'));
1303         pubsubhub($conf);
1304
1305         // If we are called from the bookmarklet, we must close the popup:
1306         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1307             echo '<script>self.close();</script>';
1308             exit;
1309         }
1310
1311         $returnurl = !empty($_POST['returnurl']) ? $_POST['returnurl'] : '?';
1312         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1313         // Scroll to the link which has been edited.
1314         $location .= '#' . smallHash($created->format('Ymd_His'));
1315         // After saving the link, redirect to the page the user was on.
1316         header('Location: '. $location);
1317         exit;
1318     }
1319
1320     // -------- User clicked the "Cancel" button when editing a link.
1321     if (isset($_POST['cancel_edit']))
1322     {
1323         // If we are called from the bookmarklet, we must close the popup:
1324         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1325         $link = $LINKSDB[(int) escape($_POST['lf_id'])];
1326         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1327         // Scroll to the link which has been edited.
1328         $returnurl .= '#'.smallHash($link['created']->format('Ymd_His'));
1329         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1330         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1331         exit;
1332     }
1333
1334     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1335     if (isset($_POST['delete_link']))
1336     {
1337         if (!tokenOk($_POST['token'])) die('Wrong token.');
1338
1339         // We do not need to ask for confirmation:
1340         // - confirmation is handled by JavaScript
1341         // - we are protected from XSRF by the token.
1342
1343         // FIXME! We keep `lf_linkdate` for consistency before a proper API. To be removed.
1344         $id = isset($_POST['lf_id']) ? (int) escape($_POST['lf_id']) : (int) escape($_POST['lf_linkdate']);
1345
1346         $pluginManager->executeHooks('delete_link', $LINKSDB[$id]);
1347
1348         unset($LINKSDB[$id]);
1349         $LINKSDB->save('resource.page_cache'); // save to disk
1350
1351         // If we are called from the bookmarklet, we must close the popup:
1352         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1353         // Pick where we're going to redirect
1354         // =============================================================
1355         // Basically, we can't redirect to where we were previously if it was a permalink
1356         // or an edit_link, because it would 404.
1357         // Cases:
1358         //    - /             : nothing in $_GET, redirect to self
1359         //    - /?page        : redirect to self
1360         //    - /?searchterm  : redirect to self (there might be other links)
1361         //    - /?searchtags  : redirect to self
1362         //    - /permalink    : redirect to / (the link does not exist anymore)
1363         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1364         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1365         // redirect is not satisfied, and only then redirect to /
1366         $location = "?";
1367         // Self redirection
1368         if (count($_GET) == 0
1369             || isset($_GET['page'])
1370             || isset($_GET['searchterm'])
1371             || isset($_GET['searchtags'])
1372         ) {
1373             if (isset($_POST['returnurl'])) {
1374                 $location = $_POST['returnurl']; // Handle redirects given by the form
1375             } else {
1376                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1377             }
1378         }
1379
1380         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1381         exit;
1382     }
1383
1384     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1385     if (isset($_GET['edit_link']))
1386     {
1387         $id = (int) escape($_GET['edit_link']);
1388         $link = $LINKSDB[$id];  // Read database
1389         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1390         $link['linkdate'] = $link['created']->format('Ymd_His');
1391         $data = array(
1392             'link' => $link,
1393             'link_is_new' => false,
1394             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1395             'tags' => $LINKSDB->allTags(),
1396         );
1397         $pluginManager->executeHooks('render_editlink', $data);
1398
1399         foreach ($data as $key => $value) {
1400             $PAGE->assign($key, $value);
1401         }
1402
1403         $PAGE->renderPage('editlink');
1404         exit;
1405     }
1406
1407     // -------- User want to post a new link: Display link edit form.
1408     if (isset($_GET['post'])) {
1409         $url = cleanup_url($_GET['post']);
1410
1411         $link_is_new = false;
1412         // Check if URL is not already in database (in this case, we will edit the existing link)
1413         $link = $LINKSDB->getLinkFromUrl($url);
1414         if (! $link)
1415         {
1416             $link_is_new = true;
1417             $linkdate = strval(date('Ymd_His'));
1418             // Get title if it was provided in URL (by the bookmarklet).
1419             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1420             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1421             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1422             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1423             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1424             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1425             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1426                 // Short timeout to keep the application responsive
1427                 list($headers, $content) = get_http_response($url, 4);
1428                 if (strpos($headers[0], '200 OK') !== false) {
1429                     // Retrieve charset.
1430                     $charset = get_charset($headers, $content);
1431                     // Extract title.
1432                     $title = html_extract_title($content);
1433                     // Re-encode title in utf-8 if necessary.
1434                     if (! empty($title) && strtolower($charset) != 'utf-8') {
1435                         $title = mb_convert_encoding($title, 'utf-8', $charset);
1436                     }
1437                 }
1438             }
1439
1440             if ($url == '') {
1441                 $url = '?' . smallHash($linkdate);
1442                 $title = 'Note: ';
1443             }
1444             $url = escape($url);
1445             $title = escape($title);
1446
1447             $link = array(
1448                 'linkdate' => $linkdate,
1449                 'title' => $title,
1450                 'url' => $url,
1451                 'description' => $description,
1452                 'tags' => $tags,
1453                 'private' => $private
1454             );
1455         } else {
1456             $link['linkdate'] = $link['created']->format('Ymd_His');
1457         }
1458
1459         $data = array(
1460             'link' => $link,
1461             'link_is_new' => $link_is_new,
1462             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1463             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1464             'tags' => $LINKSDB->allTags(),
1465             'default_private_links' => $conf->get('privacy.default_private_links', false),
1466         );
1467         $pluginManager->executeHooks('render_editlink', $data);
1468
1469         foreach ($data as $key => $value) {
1470             $PAGE->assign($key, $value);
1471         }
1472
1473         $PAGE->renderPage('editlink');
1474         exit;
1475     }
1476
1477     if ($targetPage == Router::$PAGE_EXPORT) {
1478         // Export links as a Netscape Bookmarks file
1479
1480         if (empty($_GET['selection'])) {
1481             $PAGE->renderPage('export');
1482             exit;
1483         }
1484
1485         // export as bookmarks_(all|private|public)_YYYYmmdd_HHMMSS.html
1486         $selection = $_GET['selection'];
1487         if (isset($_GET['prepend_note_url'])) {
1488             $prependNoteUrl = $_GET['prepend_note_url'];
1489         } else {
1490             $prependNoteUrl = false;
1491         }
1492
1493         try {
1494             $PAGE->assign(
1495                 'links',
1496                 NetscapeBookmarkUtils::filterAndFormat(
1497                     $LINKSDB,
1498                     $selection,
1499                     $prependNoteUrl,
1500                     index_url($_SERVER)
1501                 )
1502             );
1503         } catch (Exception $exc) {
1504             header('Content-Type: text/plain; charset=utf-8');
1505             echo $exc->getMessage();
1506             exit;
1507         }
1508         $now = new DateTime();
1509         header('Content-Type: text/html; charset=utf-8');
1510         header(
1511             'Content-disposition: attachment; filename=bookmarks_'
1512            .$selection.'_'.$now->format(LinkDB::LINK_DATE_FORMAT).'.html'
1513         );
1514         $PAGE->assign('date', $now->format(DateTime::RFC822));
1515         $PAGE->assign('eol', PHP_EOL);
1516         $PAGE->assign('selection', $selection);
1517         $PAGE->renderPage('export.bookmarks');
1518         exit;
1519     }
1520
1521     if ($targetPage == Router::$PAGE_IMPORT) {
1522         // Upload a Netscape bookmark dump to import its contents
1523
1524         if (! isset($_POST['token']) || ! isset($_FILES['filetoupload'])) {
1525             // Show import dialog
1526             $PAGE->assign('maxfilesize', getMaxFileSize());
1527             $PAGE->renderPage('import');
1528             exit;
1529         }
1530
1531         // Import bookmarks from an uploaded file
1532         if (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size'] == 0) {
1533             // The file is too big or some form field may be missing.
1534             echo '<script>alert("The file you are trying to upload is probably'
1535                 .' bigger than what this webserver can accept ('
1536                 .getMaxFileSize().' bytes).'
1537                 .' Please upload in smaller chunks.");document.location=\'?do='
1538                 .Router::$PAGE_IMPORT .'\';</script>';
1539             exit;
1540         }
1541         if (! tokenOk($_POST['token'])) {
1542             die('Wrong token.');
1543         }
1544         $status = NetscapeBookmarkUtils::import(
1545             $_POST,
1546             $_FILES,
1547             $LINKSDB,
1548             $conf->get('resource.page_cache')
1549         );
1550         echo '<script>alert("'.$status.'");document.location=\'?do='
1551              .Router::$PAGE_IMPORT .'\';</script>';
1552         exit;
1553     }
1554
1555     // Plugin administration page
1556     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1557         $pluginMeta = $pluginManager->getPluginsMeta();
1558
1559         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1560         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1561         // Load parameters.
1562         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $conf->get('plugins', array()));
1563         uasort(
1564             $enabledPlugins,
1565             function($a, $b) { return $a['order'] - $b['order']; }
1566         );
1567         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1568
1569         $PAGE->assign('enabledPlugins', $enabledPlugins);
1570         $PAGE->assign('disabledPlugins', $disabledPlugins);
1571         $PAGE->renderPage('pluginsadmin');
1572         exit;
1573     }
1574
1575     // Plugin administration form action
1576     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1577         try {
1578             if (isset($_POST['parameters_form'])) {
1579                 unset($_POST['parameters_form']);
1580                 foreach ($_POST as $param => $value) {
1581                     $conf->set('plugins.'. $param, escape($value));
1582                 }
1583             }
1584             else {
1585                 $conf->set('general.enabled_plugins', save_plugin_config($_POST));
1586             }
1587             $conf->write(isLoggedIn());
1588         }
1589         catch (Exception $e) {
1590             error_log(
1591                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1592                 $e->getMessage()
1593             );
1594
1595             // TODO: do not handle exceptions/errors in JS.
1596             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do='. Router::$PAGE_PLUGINSADMIN .'\';</script>';
1597             exit;
1598         }
1599         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1600         exit;
1601     }
1602
1603     // -------- Otherwise, simply display search form and links:
1604     showLinkList($PAGE, $LINKSDB, $conf, $pluginManager);
1605     exit;
1606 }
1607
1608 /**
1609  * Template for the list of links (<div id="linklist">)
1610  * This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1611  *
1612  * @param pageBuilder   $PAGE          pageBuilder instance.
1613  * @param LinkDB        $LINKSDB       LinkDB instance.
1614  * @param ConfigManager $conf          Configuration Manager instance.
1615  * @param PluginManager $pluginManager Plugin Manager instance.
1616  */
1617 function buildLinkList($PAGE,$LINKSDB, $conf, $pluginManager)
1618 {
1619     // Used in templates
1620     $searchtags = !empty($_GET['searchtags']) ? escape($_GET['searchtags']) : '';
1621     $searchterm = !empty($_GET['searchterm']) ? escape($_GET['searchterm']) : '';
1622
1623     // Smallhash filter
1624     if (! empty($_SERVER['QUERY_STRING'])
1625         && preg_match('/^[a-zA-Z0-9-_@]{6}($|&|#)/', $_SERVER['QUERY_STRING'])) {
1626         try {
1627             $linksToDisplay = $LINKSDB->filterHash($_SERVER['QUERY_STRING']);
1628         } catch (LinkNotFoundException $e) {
1629             $PAGE->render404($e->getMessage());
1630             exit;
1631         }
1632     } else {
1633         // Filter links according search parameters.
1634         $privateonly = !empty($_SESSION['privateonly']);
1635         $linksToDisplay = $LINKSDB->filterSearch($_GET, false, $privateonly);
1636     }
1637
1638     // ---- Handle paging.
1639     $keys = array();
1640     foreach ($linksToDisplay as $key => $value) {
1641         $keys[] = $key;
1642     }
1643
1644
1645
1646     // Select articles according to paging.
1647     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1648     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1649     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1650     $page = $page < 1 ? 1 : $page;
1651     $page = $page > $pagecount ? $pagecount : $page;
1652     // Start index.
1653     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1654     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1655     $linkDisp = array();
1656     while ($i<$end && $i<count($keys))
1657     {
1658         $link = $linksToDisplay[$keys[$i]];
1659         $link['description'] = format_description($link['description'], $conf->get('redirector.url'));
1660         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
1661         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
1662         $link['timestamp'] = $link['created']->getTimestamp();
1663         if (! empty($link['updated'])) {
1664             $link['updated_timestamp'] = $link['updated']->getTimestamp();
1665         } else {
1666             $link['updated_timestamp'] = '';
1667         }
1668         $taglist = explode(' ', $link['tags']);
1669         uasort($taglist, 'strcasecmp');
1670         $link['taglist'] = $taglist;
1671         $link['shorturl'] = smallHash($link['created']->format('Ymd_His'));
1672         // Check for both signs of a note: starting with ? and 7 chars long.
1673         if ($link['url'][0] === '?' &&
1674             strlen($link['url']) === 7) {
1675             $link['url'] = index_url($_SERVER) . $link['url'];
1676         }
1677
1678         $linkDisp[$keys[$i]] = $link;
1679         $i++;
1680     }
1681
1682     // Compute paging navigation
1683     $searchtagsUrl = empty($searchtags) ? '' : '&searchtags=' . urlencode($searchtags);
1684     $searchtermUrl = empty($searchterm) ? '' : '&searchterm=' . urlencode($searchterm);
1685     $previous_page_url = '';
1686     if ($i != count($keys)) {
1687         $previous_page_url = '?page=' . ($page+1) . $searchtermUrl . $searchtagsUrl;
1688     }
1689     $next_page_url='';
1690     if ($page>1) {
1691         $next_page_url = '?page=' . ($page-1) . $searchtermUrl . $searchtagsUrl;
1692     }
1693
1694     // Fill all template fields.
1695     $data = array(
1696         'previous_page_url' => $previous_page_url,
1697         'next_page_url' => $next_page_url,
1698         'page_current' => $page,
1699         'page_max' => $pagecount,
1700         'result_count' => count($linksToDisplay),
1701         'search_term' => $searchterm,
1702         'search_tags' => $searchtags,
1703         'redirector' => $conf->get('redirector.url'),  // Optional redirector URL.
1704         'links' => $linkDisp,
1705         'tags' => $LINKSDB->allTags(),
1706     );
1707
1708     // If there is only a single link, we change on-the-fly the title of the page.
1709     if (count($linksToDisplay) == 1) {
1710         $data['pagetitle'] = $linksToDisplay[$keys[0]]['title'] .' - '. $conf->get('general.title');
1711     }
1712
1713     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
1714
1715     foreach ($data as $key => $value) {
1716         $PAGE->assign($key, $value);
1717     }
1718
1719     return;
1720 }
1721
1722 /**
1723  * Compute the thumbnail for a link.
1724  *
1725  * With a link to the original URL.
1726  * Understands various services (youtube.com...)
1727  * Input: $url = URL for which the thumbnail must be found.
1728  *        $href = if provided, this URL will be followed instead of $url
1729  * Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1730  * Some of them may be missing.
1731  * Return an empty array if no thumbnail available.
1732  *
1733  * @param ConfigManager $conf Configuration Manager instance.
1734  * @param string        $url
1735  * @param string|bool   $href
1736  *
1737  * @return array
1738  */
1739 function computeThumbnail($conf, $url, $href = false)
1740 {
1741     if (!$conf->get('thumbnail.enable_thumbnails')) return array();
1742     if ($href==false) $href=$url;
1743
1744     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1745     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1746     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1747     $domain = parse_url($url,PHP_URL_HOST);
1748     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1749     {
1750         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1751         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1752                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1753     }
1754     if ($domain=='youtu.be') // Youtube short links
1755     {
1756         $path = parse_url($url,PHP_URL_PATH);
1757         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1758                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1759     }
1760     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1761     {
1762         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1763         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1764                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1765     }
1766
1767     if ($domain=='imgur.com')
1768     {
1769         $path = parse_url($url,PHP_URL_PATH);
1770         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1771         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1772                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1773         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1774                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1775
1776         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1777                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1778     }
1779     if ($domain=='i.imgur.com')
1780     {
1781         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1782         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1783                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1784     }
1785     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1786     {
1787         if (strpos($url,'dailymotion.com/video/')!==false)
1788         {
1789             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1790             return array('src'=>$thumburl,
1791                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1792         }
1793     }
1794     if (endsWith($domain,'.imageshack.us'))
1795     {
1796         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1797         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1798         {
1799             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1800             return array('src'=>$thumburl,
1801                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1802         }
1803     }
1804
1805     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1806     // So we deport the thumbnail generation in order not to slow down page generation
1807     // (and we also cache the thumbnail)
1808
1809     if (! $conf->get('thumbnail.enable_localcache')) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1810
1811     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1812         || $domain=='vimeo.com'
1813         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1814         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1815     )
1816     {
1817         if ($domain=='vimeo.com')
1818         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1819             $path = parse_url($url,PHP_URL_PATH);
1820             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1821         }
1822         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
1823         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
1824             $path = parse_url($url,PHP_URL_PATH);
1825             if (!preg_match('!/\d+.+?!',$path)) return array();
1826         }
1827         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
1828         {   // Make sure this TED URL points to a video (/talks/...)
1829             $path = parse_url($url,PHP_URL_PATH);
1830             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
1831         }
1832         $sign = hash_hmac('sha256', $url, $conf->get('credentials.salt')); // We use the salt to sign data (it's random, secret, and specific to each installation)
1833         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1834                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1835     }
1836
1837     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1838     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1839     // But using the extension will do.
1840     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1841     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1842     {
1843         $sign = hash_hmac('sha256', $url, $conf->get('credentials.salt')); // We use the salt to sign data (it's random, secret, and specific to each installation)
1844         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1845                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1846     }
1847     return array(); // No thumbnail.
1848
1849 }
1850
1851
1852 // Returns the HTML code to display a thumbnail for a link
1853 // with a link to the original URL.
1854 // Understands various services (youtube.com...)
1855 // Input: $url = URL for which the thumbnail must be found.
1856 //        $href = if provided, this URL will be followed instead of $url
1857 // Returns '' if no thumbnail available.
1858 function thumbnail($url,$href=false)
1859 {
1860     // FIXME!
1861     global $conf;
1862     $t = computeThumbnail($conf, $url,$href);
1863     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1864
1865     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
1866     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1867     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1868     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1869     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1870     $html.='></a>';
1871     return $html;
1872 }
1873
1874 // Returns the HTML code to display a thumbnail for a link
1875 // for the picture wall (using lazy image loading)
1876 // Understands various services (youtube.com...)
1877 // Input: $url = URL for which the thumbnail must be found.
1878 //        $href = if provided, this URL will be followed instead of $url
1879 // Returns '' if no thumbnail available.
1880 function lazyThumbnail($conf, $url,$href=false)
1881 {
1882     // FIXME!
1883     global $conf;
1884     $t = computeThumbnail($conf, $url,$href);
1885     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1886
1887     $html='<a href="'.escape($t['href']).'">';
1888
1889     // Lazy image
1890     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
1891
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.='>';
1897
1898     // No-JavaScript fallback.
1899     $html.='<noscript><img src="'.escape($t['src']).'"';
1900     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1901     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1902     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1903     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1904     $html.='></noscript></a>';
1905
1906     return $html;
1907 }
1908
1909
1910 /**
1911  * Installation
1912  * This function should NEVER be called if the file data/config.php exists.
1913  *
1914  * @param ConfigManager $conf Configuration Manager instance.
1915  */
1916 function install($conf)
1917 {
1918     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
1919     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
1920
1921
1922     // This part makes sure sessions works correctly.
1923     // (Because on some hosts, session.save_path may not be set correctly,
1924     // or we may not have write access to it.)
1925     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
1926     {   // Step 2: Check if data in session is correct.
1927         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
1928         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
1929         echo 'It currently points to '.session_save_path().'<br>';
1930         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
1931         echo '<br><a href="?">Click to try again.</a></pre>';
1932         die;
1933     }
1934     if (!isset($_SESSION['session_tested']))
1935     {   // Step 1 : Try to store data in session and reload page.
1936         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
1937         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
1938     }
1939     if (isset($_GET['test_session']))
1940     {   // Step 3: Sessions are OK. Remove test parameter from URL.
1941         header('Location: '.index_url($_SERVER));
1942     }
1943
1944
1945     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
1946     {
1947         $tz = 'UTC';
1948         if (!empty($_POST['continent']) && !empty($_POST['city'])
1949             && isTimeZoneValid($_POST['continent'], $_POST['city'])
1950         ) {
1951             $tz = $_POST['continent'].'/'.$_POST['city'];
1952         }
1953         $conf->set('general.timezone', $tz);
1954         $login = $_POST['setlogin'];
1955         $conf->set('credentials.login', $login);
1956         $salt = sha1(uniqid('', true) .'_'. mt_rand());
1957         $conf->set('credentials.salt', $salt);
1958         $conf->set('credentials.hash', sha1($_POST['setpassword'] . $login . $salt));
1959         if (!empty($_POST['title'])) {
1960             $conf->set('general.title', escape($_POST['title']));
1961         } else {
1962             $conf->set('general.title', 'Shared links on '.escape(index_url($_SERVER)));
1963         }
1964         $conf->set('updates.check_updates', !empty($_POST['updateCheck']));
1965         try {
1966             // Everything is ok, let's create config file.
1967             $conf->write(isLoggedIn());
1968         }
1969         catch(Exception $e) {
1970             error_log(
1971                     'ERROR while writing config file after installation.' . PHP_EOL .
1972                     $e->getMessage()
1973                 );
1974
1975             // TODO: do not handle exceptions/errors in JS.
1976             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
1977             exit;
1978         }
1979         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
1980         exit;
1981     }
1982
1983     // Display config form:
1984     list($timezone_form, $timezone_js) = generateTimeZoneForm();
1985     $timezone_html = '';
1986     if ($timezone_form != '') {
1987         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
1988     }
1989
1990     $PAGE = new PageBuilder($conf);
1991     $PAGE->assign('timezone_html',$timezone_html);
1992     $PAGE->assign('timezone_js',$timezone_js);
1993     $PAGE->renderPage('install');
1994     exit;
1995 }
1996
1997 /**
1998  * Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
1999  * I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2000  * The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2001  * This function is called by passing the URL:
2002  * http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2003  * [URL] is the URL of the link (e.g. a flickr page)
2004  * [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2005  * The function below will fetch the image from the webservice and store it in the cache.
2006  *
2007  * @param ConfigManager $conf Configuration Manager instance,
2008  */
2009 function genThumbnail($conf)
2010 {
2011     // Make sure the parameters in the URL were generated by us.
2012     $sign = hash_hmac('sha256', $_GET['url'], $conf->get('credentials.salt'));
2013     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2014
2015     $cacheDir = $conf->get('resource.thumbnails_cache', 'cache');
2016     // Let's see if we don't already have the image for this URL in the cache.
2017     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2018     if (is_file($cacheDir .'/'. $thumbname))
2019     {   // We have the thumbnail, just serve it:
2020         header('Content-Type: image/jpeg');
2021         echo file_get_contents($cacheDir .'/'. $thumbname);
2022         return;
2023     }
2024     // We may also serve a blank image (if service did not respond)
2025     $blankname=hash('sha1',$_GET['url']).'.gif';
2026     if (is_file($cacheDir .'/'. $blankname))
2027     {
2028         header('Content-Type: image/gif');
2029         echo file_get_contents($cacheDir .'/'. $blankname);
2030         return;
2031     }
2032
2033     // Otherwise, generate the thumbnail.
2034     $url = $_GET['url'];
2035     $domain = parse_url($url,PHP_URL_HOST);
2036
2037     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2038     {
2039         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2040         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2041
2042         // Is this a link to an image, or to a flickr page ?
2043         $imageurl='';
2044         if (endsWith(parse_url($url, PHP_URL_PATH), '.jpg'))
2045         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2046             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2047             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2048         }
2049         else // This is a flickr page (html)
2050         {
2051             // Get the flickr html page.
2052             list($headers, $content) = get_http_response($url, 20);
2053             if (strpos($headers[0], '200 OK') !== false)
2054             {
2055                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2056                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2057                 if (!empty($matches[1])) $imageurl=$matches[1];
2058
2059                 // In albums (and some other pages), the link rel="image_src" is not provided,
2060                 // but flickr provides:
2061                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2062                 if ($imageurl=='')
2063                 {
2064                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2065                     if (!empty($matches[1])) $imageurl=$matches[1];
2066                 }
2067             }
2068         }
2069
2070         if ($imageurl!='')
2071         {   // Let's download the image.
2072             // Image is 240x120, so 10 seconds to download should be enough.
2073             list($headers, $content) = get_http_response($imageurl, 10);
2074             if (strpos($headers[0], '200 OK') !== false) {
2075                 // Save image to cache.
2076                 file_put_contents($cacheDir .'/'. $thumbname, $content);
2077                 header('Content-Type: image/jpeg');
2078                 echo $content;
2079                 return;
2080             }
2081         }
2082     }
2083
2084     elseif ($domain=='vimeo.com' )
2085     {
2086         // This is more complex: we have to perform a HTTP request, then parse the result.
2087         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2088         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2089         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2090         if (strpos($headers[0], '200 OK') !== false) {
2091             $t = unserialize($content);
2092             $imageurl = $t[0]['thumbnail_medium'];
2093             // Then we download the image and serve it to our client.
2094             list($headers, $content) = get_http_response($imageurl, 10);
2095             if (strpos($headers[0], '200 OK') !== false) {
2096                 // Save image to cache.
2097                 file_put_contents($cacheDir .'/'. $thumbname, $content);
2098                 header('Content-Type: image/jpeg');
2099                 echo $content;
2100                 return;
2101             }
2102         }
2103     }
2104
2105     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2106     {
2107         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2108         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2109         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2110         list($headers, $content) = get_http_response($url, 5);
2111         if (strpos($headers[0], '200 OK') !== false) {
2112             // Extract the link to the thumbnail
2113             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2114             if (!empty($matches[1]))
2115             {   // Let's download the image.
2116                 $imageurl=$matches[1];
2117                 // No control on image size, so wait long enough
2118                 list($headers, $content) = get_http_response($imageurl, 20);
2119                 if (strpos($headers[0], '200 OK') !== false) {
2120                     $filepath = $cacheDir .'/'. $thumbname;
2121                     file_put_contents($filepath, $content); // Save image to cache.
2122                     if (resizeImage($filepath))
2123                     {
2124                         header('Content-Type: image/jpeg');
2125                         echo file_get_contents($filepath);
2126                         return;
2127                     }
2128                 }
2129             }
2130         }
2131     }
2132
2133     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2134     {
2135         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2136         // http://xkcd.com/327/
2137         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2138         list($headers, $content) = get_http_response($url, 5);
2139         if (strpos($headers[0], '200 OK') !== false) {
2140             // Extract the link to the thumbnail
2141             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2142             if (!empty($matches[1]))
2143             {   // Let's download the image.
2144                 $imageurl=$matches[1];
2145                 // No control on image size, so wait long enough
2146                 list($headers, $content) = get_http_response($imageurl, 20);
2147                 if (strpos($headers[0], '200 OK') !== false) {
2148                     $filepath = $cacheDir.'/'.$thumbname;
2149                     // Save image to cache.
2150                     file_put_contents($filepath, $content);
2151                     if (resizeImage($filepath))
2152                     {
2153                         header('Content-Type: image/jpeg');
2154                         echo file_get_contents($filepath);
2155                         return;
2156                     }
2157                 }
2158             }
2159         }
2160     }
2161
2162     else
2163     {
2164         // For all other domains, we try to download the image and make a thumbnail.
2165         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2166         list($headers, $content) = get_http_response($url, 30);
2167         if (strpos($headers[0], '200 OK') !== false) {
2168             $filepath = $cacheDir .'/'.$thumbname;
2169             // Save image to cache.
2170             file_put_contents($filepath, $content);
2171             if (resizeImage($filepath))
2172             {
2173                 header('Content-Type: image/jpeg');
2174                 echo file_get_contents($filepath);
2175                 return;
2176             }
2177         }
2178     }
2179
2180
2181     // Otherwise, return an empty image (8x8 transparent gif)
2182     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2183     // Also put something in cache so that this URL is not requested twice.
2184     file_put_contents($cacheDir .'/'. $blankname, $blankgif);
2185     header('Content-Type: image/gif');
2186     echo $blankgif;
2187 }
2188
2189 // Make a thumbnail of the image (to width: 120 pixels)
2190 // Returns true if success, false otherwise.
2191 function resizeImage($filepath)
2192 {
2193     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2194
2195     // Trick: some stupid people rename GIF as JPEG... or else.
2196     // So we really try to open each image type whatever the extension is.
2197     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2198     $im=false;
2199     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2200     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2201     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2202     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2203     $w = imagesx($im);
2204     $h = imagesy($im);
2205     $ystart = 0; $yheight=$h;
2206     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2207     $nw = 120;   // Desired width
2208     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2209     // Resize image:
2210     $im2 = imagecreatetruecolor($nw,$nh);
2211     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2212     imageinterlace($im2,true); // For progressive JPEG.
2213     $tempname=$filepath.'_TEMP.jpg';
2214     imagejpeg($im2, $tempname, 90);
2215     imagedestroy($im);
2216     imagedestroy($im2);
2217     unlink($filepath);
2218     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2219     return true;
2220 }
2221
2222 if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=genthumbnail')) { genThumbnail($conf); exit; }  // Thumbnail generation/cache does not need the link database.
2223 if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=dailyrss')) { showDailyRSS($conf); exit; }
2224 if (!isset($_SESSION['LINKS_PER_PAGE'])) {
2225     $_SESSION['LINKS_PER_PAGE'] = $conf->get('general.links_per_page', 20);
2226 }
2227 renderPage($conf, $pluginManager);