index.php

   1 <?php
   2 /**
   3  * Shaarli v0.8.1 - 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', '0.8.1');
  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
 179 /**
 180  * Checking session state (i.e. is the user still logged in)
 181  *
 182  * @param ConfigManager $conf The configuration manager.
 183  *
 184  * @return bool: true if the user is logged in, false otherwise.
 185  */
 186 function setup_login_state($conf)
 187 {
 188         if ($conf->get('security.open_shaarli')) {
 189             return true;
 190         }
 191         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 192         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 193         if (! $conf->exists('credentials.login')) {
 194             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 195             $loginFailure = true;
 196         }
 197         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 198             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 199             !$loginFailure)
 200         {
 201             fillSessionInfo($conf);
 202             $userIsLoggedIn = true;
 203         }
 204         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 205         if (empty($_SESSION['uid'])
 206         || ($conf->get('security.session_protection_disabled') == false && $_SESSION['ip'] != allIPs())
 207         || time() >= $_SESSION['expires_on'])
 208         {
 209             logout();
 210             $userIsLoggedIn = false;
 211             $loginFailure = true;
 212         }
 213         if (!empty($_SESSION['longlastingsession'])) {
 214             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 215         }
 216         else {
 217             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 218         }
 219         if (!$loginFailure) {
 220             $userIsLoggedIn = true;
 221         }
 222
 223         return $userIsLoggedIn;
 224 }
 225 $userIsLoggedIn = setup_login_state($conf);
 226
 227 /**
 228  * PubSubHubbub protocol support (if enabled)  [UNTESTED]
 229  * (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 230  *
 231  * @param ConfigManager $conf Configuration Manager instance.
 232  */
 233 function pubsubhub($conf)
 234 {
 235     $pshUrl = $conf->get('config.PUBSUBHUB_URL');
 236     if (!empty($pshUrl))
 237     {
 238         include_once './publisher.php';
 239         $p = new Publisher($pshUrl);
 240         $topic_url = array (
 241             index_url($_SERVER).'?do=atom',
 242             index_url($_SERVER).'?do=rss'
 243         );
 244         $p->publish_update($topic_url);
 245     }
 246 }
 247
 248 // ------------------------------------------------------------------------------------------
 249 // Session management
 250
 251 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 252 function allIPs()
 253 {
 254     $ip = $_SERVER['REMOTE_ADDR'];
 255     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 256     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 257     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 258     return $ip;
 259 }
 260
 261 /**
 262  * Load user session.
 263  *
 264  * @param ConfigManager $conf Configuration Manager instance.
 265  */
 266 function fillSessionInfo($conf)
 267 {
 268         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 269         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 270         $_SESSION['username']= $conf->get('credentials.login');
 271         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 272 }
 273
 274 /**
 275  * Check that user/password is correct.
 276  *
 277  * @param string        $login    Username
 278  * @param string        $password User password
 279  * @param ConfigManager $conf     Configuration Manager instance.
 280  *
 281  * @return bool: authentication successful or not.
 282  */
 283 function check_auth($login, $password, $conf)
 284 {
 285     $hash = sha1($password . $login . $conf->get('credentials.salt'));
 286     if ($login == $conf->get('credentials.login') && $hash == $conf->get('credentials.hash'))
 287     {   // Login/password is correct.
 288                 fillSessionInfo($conf);
 289         logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Login successful');
 290         return true;
 291     }
 292     logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Login failed for user '.$login);
 293     return false;
 294 }
 295
 296 // Returns true if the user is logged in.
 297 function isLoggedIn()
 298 {
 299     global $userIsLoggedIn;
 300     return $userIsLoggedIn;
 301 }
 302
 303 // Force logout.
 304 function logout() {
 305     if (isset($_SESSION)) {
 306         unset($_SESSION['uid']);
 307         unset($_SESSION['ip']);
 308         unset($_SESSION['username']);
 309         unset($_SESSION['privateonly']);
 310     }
 311     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 312 }
 313
 314
 315 // ------------------------------------------------------------------------------------------
 316 // Brute force protection system
 317 // Several consecutive failed logins will ban the IP address for 30 minutes.
 318 if (!is_file($conf->get('resource.ban_file', 'data/ipbans.php'))) {
 319     // FIXME! globals
 320     file_put_contents(
 321         $conf->get('resource.ban_file', 'data/ipbans.php'),
 322         "<?php\n\$GLOBALS['IPBANS']=".var_export(array('FAILURES'=>array(),'BANS'=>array()),true).";\n?>"
 323     );
 324 }
 325 include $conf->get('resource.ban_file', 'data/ipbans.php');
 326 /**
 327  * Signal a failed login. Will ban the IP if too many failures:
 328  *
 329  * @param ConfigManager $conf Configuration Manager instance.
 330  */
 331 function ban_loginFailed($conf)
 332 {
 333     $ip = $_SERVER['REMOTE_ADDR'];
 334     $trusted = $conf->get('security.trusted_proxies', array());
 335     if (in_array($ip, $trusted)) {
 336         $ip = getIpAddressFromProxy($_SERVER, $trusted);
 337         if (!$ip) {
 338             return;
 339         }
 340     }
 341     $gb = $GLOBALS['IPBANS'];
 342     if (! isset($gb['FAILURES'][$ip])) {
 343         $gb['FAILURES'][$ip]=0;
 344     }
 345     $gb['FAILURES'][$ip]++;
 346     if ($gb['FAILURES'][$ip] > ($conf->get('security.ban_after') - 1))
 347     {
 348         $gb['BANS'][$ip] = time() + $conf->get('security.ban_after', 1800);
 349         logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'IP address banned from login');
 350     }
 351     $GLOBALS['IPBANS'] = $gb;
 352     file_put_contents(
 353         $conf->get('resource.ban_file', 'data/ipbans.php'),
 354         "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 355     );
 356 }
 357
 358 /**
 359  * Signals a successful login. Resets failed login counter.
 360  *
 361  * @param ConfigManager $conf Configuration Manager instance.
 362  */
 363 function ban_loginOk($conf)
 364 {
 365     $ip = $_SERVER['REMOTE_ADDR'];
 366     $gb = $GLOBALS['IPBANS'];
 367     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 368     $GLOBALS['IPBANS'] = $gb;
 369     file_put_contents(
 370         $conf->get('resource.ban_file', 'data/ipbans.php'),
 371         "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 372     );
 373 }
 374
 375 /**
 376  * Checks if the user CAN login. If 'true', the user can try to login.
 377  *
 378  * @param ConfigManager $conf Configuration Manager instance.
 379  *
 380  * @return bool: true if the user is allowed to login.
 381  */
 382 function ban_canLogin($conf)
 383 {
 384     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 385     if (isset($gb['BANS'][$ip]))
 386     {
 387         // User is banned. Check if the ban has expired:
 388         if ($gb['BANS'][$ip]<=time())
 389         {   // Ban expired, user can try to login again.
 390             logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Ban lifted.');
 391             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 392             file_put_contents(
 393                 $conf->get('resource.ban_file', 'data/ipbans.php'),
 394                 "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 395             );
 396             return true; // Ban has expired, user can login.
 397         }
 398         return false; // User is banned.
 399     }
 400     return true; // User is not banned.
 401 }
 402
 403 // ------------------------------------------------------------------------------------------
 404 // Process login form: Check if login/password is correct.
 405 if (isset($_POST['login']))
 406 {
 407     if (!ban_canLogin($conf)) die('I said: NO. You are banned for the moment. Go away.');
 408     if (isset($_POST['password'])
 409         && tokenOk($_POST['token'])
 410         && (check_auth($_POST['login'], $_POST['password'], $conf))
 411     ) {   // Login/password is OK.
 412         ban_loginOk($conf);
 413         // If user wants to keep the session cookie even after the browser closes:
 414         if (!empty($_POST['longlastingsession']))
 415         {
 416                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 417             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 418             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 419
 420             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 421             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 422             // Note: Never forget the trailing slash on the cookie path!
 423             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 424         }
 425         else // Standard session expiration (=when browser closes)
 426         {
 427             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 428             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 429             session_regenerate_id(true);
 430         }
 431
 432         // Optional redirect after login:
 433         if (isset($_GET['post'])) {
 434             $uri = '?post='. urlencode($_GET['post']);
 435             foreach (array('description', 'source', 'title') as $param) {
 436                 if (!empty($_GET[$param])) {
 437                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 438                 }
 439             }
 440             header('Location: '. $uri);
 441             exit;
 442         }
 443
 444         if (isset($_GET['edit_link'])) {
 445             header('Location: ?edit_link='. escape($_GET['edit_link']));
 446             exit;
 447         }
 448
 449         if (isset($_POST['returnurl'])) {
 450             // Prevent loops over login screen.
 451             if (strpos($_POST['returnurl'], 'do=login') === false) {
 452                 header('Location: '. generateLocation($_POST['returnurl'], $_SERVER['HTTP_HOST']));
 453                 exit;
 454             }
 455         }
 456         header('Location: ?'); exit;
 457     }
 458     else
 459     {
 460         ban_loginFailed($conf);
 461         $redir = '&username='. $_POST['login'];
 462         if (isset($_GET['post'])) {
 463             $redir .= '&post=' . urlencode($_GET['post']);
 464             foreach (array('description', 'source', 'title') as $param) {
 465                 if (!empty($_GET[$param])) {
 466                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 467                 }
 468             }
 469         }
 470         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 471         exit;
 472     }
 473 }
 474
 475 // ------------------------------------------------------------------------------------------
 476 // Misc utility functions:
 477
 478 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 479 function return_bytes($val)
 480 {
 481     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 482     switch($last)
 483     {
 484         case 'g': $val *= 1024;
 485         case 'm': $val *= 1024;
 486         case 'k': $val *= 1024;
 487     }
 488     return $val;
 489 }
 490
 491 // Try to determine max file size for uploads (POST).
 492 // Returns an integer (in bytes)
 493 function getMaxFileSize()
 494 {
 495     $size1 = return_bytes(ini_get('post_max_size'));
 496     $size2 = return_bytes(ini_get('upload_max_filesize'));
 497     // Return the smaller of two:
 498     $maxsize = min($size1,$size2);
 499     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 500     return $maxsize;
 501 }
 502
 503 // ------------------------------------------------------------------------------------------
 504 // Token management for XSRF protection
 505 // Token should be used in any form which acts on data (create,update,delete,import...).
 506 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 507
 508 /**
 509  * Returns a token.
 510  *
 511  * @param ConfigManager $conf Configuration Manager instance.
 512  *
 513  * @return string token.
 514  */
 515 function getToken($conf)
 516 {
 517     $rnd = sha1(uniqid('', true) .'_'. mt_rand() . $conf->get('credentials.salt'));  // We generate a random string.
 518     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 519     return $rnd;
 520 }
 521
 522 // Tells if a token is OK. Using this function will destroy the token.
 523 // true=token is OK.
 524 function tokenOk($token)
 525 {
 526     if (isset($_SESSION['tokens'][$token]))
 527     {
 528         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 529         return true; // Token is OK.
 530     }
 531     return false; // Wrong token, or already used.
 532 }
 533
 534 /**
 535  * Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 536  * Gives the last 7 days (which have links).
 537  * This RSS feed cannot be filtered.
 538  *
 539  * @param ConfigManager $conf Configuration Manager instance.
 540  */
 541 function showDailyRSS($conf) {
 542     // Cache system
 543     $query = $_SERVER['QUERY_STRING'];
 544     $cache = new CachedPage(
 545         $conf->get('config.PAGE_CACHE'),
 546         page_url($_SERVER),
 547         startsWith($query,'do=dailyrss') && !isLoggedIn()
 548     );
 549     $cached = $cache->cachedVersion();
 550     if (!empty($cached)) {
 551         echo $cached;
 552         exit;
 553     }
 554
 555     // If cached was not found (or not usable), then read the database and build the response:
 556     // Read links from database (and filter private links if used it not logged in).
 557     $LINKSDB = new LinkDB(
 558         $conf->get('resource.datastore'),
 559         isLoggedIn(),
 560         $conf->get('privacy.hide_public_links'),
 561         $conf->get('redirector.url'),
 562         $conf->get('redirector.encode_url')
 563     );
 564
 565     /* Some Shaarlies may have very few links, so we need to look
 566        back in time until we have enough days ($nb_of_days).
 567     */
 568     $nb_of_days = 7; // We take 7 days.
 569     $today = date('Ymd');
 570     $days = array();
 571
 572     foreach ($LINKSDB as $link) {
 573         $day = $link['created']->format('Ymd'); // Extract day (without time)
 574         if (strcmp($day, $today) < 0) {
 575             if (empty($days[$day])) {
 576                 $days[$day] = array();
 577             }
 578             $days[$day][] = $link;
 579         }
 580
 581         if (count($days) > $nb_of_days) {
 582             break; // Have we collected enough days?
 583         }
 584     }
 585
 586     // Build the RSS feed.
 587     header('Content-Type: application/rss+xml; charset=utf-8');
 588     $pageaddr = escape(index_url($_SERVER));
 589     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 590     echo '<channel>';
 591     echo '<title>Daily - '. $conf->get('general.title') . '</title>';
 592     echo '<link>'. $pageaddr .'</link>';
 593     echo '<description>Daily shared links</description>';
 594     echo '<language>en-en</language>';
 595     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 596
 597     // For each day.
 598     foreach ($days as $day => $links) {
 599         $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 600         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 601
 602         // We pre-format some fields for proper output.
 603         foreach ($links as &$link) {
 604             $link['formatedDescription'] = format_description($link['description'], $conf->get('redirector.url'));
 605             $link['thumbnail'] = thumbnail($conf, $link['url']);
 606             $link['timestamp'] = $link['created']->getTimestamp();
 607             if (startsWith($link['url'], '?')) {
 608                 $link['url'] = index_url($_SERVER) . $link['url'];  // make permalink URL absolute
 609             }
 610         }
 611
 612         // Then build the HTML for this day:
 613         $tpl = new RainTPL;
 614         $tpl->assign('title', $conf->get('general.title'));
 615         $tpl->assign('daydate', $dayDate->getTimestamp());
 616         $tpl->assign('absurl', $absurl);
 617         $tpl->assign('links', $links);
 618         $tpl->assign('rssdate', escape($dayDate->format(DateTime::RSS)));
 619         $tpl->assign('hide_timestamps', $conf->get('privacy.hide_timestamps', false));
 620         $html = $tpl->draw('dailyrss', $return_string=true);
 621
 622         echo $html . PHP_EOL;
 623     }
 624     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
 625
 626     $cache->cache(ob_get_contents());
 627     ob_end_flush();
 628     exit;
 629 }
 630
 631 /**
 632  * Show the 'Daily' page.
 633  *
 634  * @param PageBuilder   $pageBuilder   Template engine wrapper.
 635  * @param LinkDB        $LINKSDB       LinkDB instance.
 636  * @param ConfigManager $conf          Configuration Manager instance.
 637  * @param PluginManager $pluginManager Plugin Manager instane.
 638  */
 639 function showDaily($pageBuilder, $LINKSDB, $conf, $pluginManager)
 640 {
 641     $day=date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 642     if (isset($_GET['day'])) $day=$_GET['day'];
 643
 644     $days = $LINKSDB->days();
 645     $i = array_search($day,$days);
 646     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
 647     $previousday='';
 648     $nextday='';
 649     if ($i!==false)
 650     {
 651         if ($i>=1) $previousday=$days[$i-1];
 652         if ($i<count($days)-1) $nextday=$days[$i+1];
 653     }
 654
 655     try {
 656         $linksToDisplay = $LINKSDB->filterDay($day);
 657     } catch (Exception $exc) {
 658         error_log($exc);
 659         $linksToDisplay = array();
 660     }
 661
 662     // We pre-format some fields for proper output.
 663     foreach($linksToDisplay as $key=>$link)
 664     {
 665
 666         $taglist = explode(' ',$link['tags']);
 667         uasort($taglist, 'strcasecmp');
 668         $linksToDisplay[$key]['taglist']=$taglist;
 669         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $conf->get('redirector.url'));
 670         $linksToDisplay[$key]['thumbnail'] = thumbnail($conf, $link['url']);
 671         $linksToDisplay[$key]['timestamp'] =  $link['created']->getTimestamp();
 672     }
 673
 674     /* We need to spread the articles on 3 columns.
 675        I did not want to use a JavaScript lib like http://masonry.desandro.com/
 676        so I manually spread entries with a simple method: I roughly evaluate the
 677        height of a div according to title and description length.
 678     */
 679     $columns=array(array(),array(),array()); // Entries to display, for each column.
 680     $fill=array(0,0,0);  // Rough estimate of columns fill.
 681     foreach($linksToDisplay as $key=>$link)
 682     {
 683         // Roughly estimate length of entry (by counting characters)
 684         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
 685         // Description: 836 characters gives roughly 342 pixel height.
 686         // This is not perfect, but it's usually OK.
 687         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
 688         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
 689         // Then put in column which is the less filled:
 690         $smallest=min($fill); // find smallest value in array.
 691         $index=array_search($smallest,$fill); // find index of this smallest value.
 692         array_push($columns[$index],$link); // Put entry in this column.
 693         $fill[$index]+=$length;
 694     }
 695
 696     $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 697     $data = array(
 698         'linksToDisplay' => $linksToDisplay,
 699         'cols' => $columns,
 700         'day' => $dayDate->getTimestamp(),
 701         'previousday' => $previousday,
 702         'nextday' => $nextday,
 703     );
 704
 705     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
 706
 707     foreach ($data as $key => $value) {
 708         $pageBuilder->assign($key, $value);
 709     }
 710
 711     $pageBuilder->renderPage('daily');
 712     exit;
 713 }
 714
 715 /**
 716  * Renders the linklist
 717  *
 718  * @param pageBuilder   $PAGE    pageBuilder instance.
 719  * @param LinkDB        $LINKSDB LinkDB instance.
 720  * @param ConfigManager $conf    Configuration Manager instance.
 721  * @param PluginManager $pluginManager Plugin Manager instance.
 722  */
 723 function showLinkList($PAGE, $LINKSDB, $conf, $pluginManager) {
 724     buildLinkList($PAGE,$LINKSDB, $conf, $pluginManager); // Compute list of links to display
 725     $PAGE->renderPage('linklist');
 726 }
 727
 728 /**
 729  * Render HTML page (according to URL parameters and user rights)
 730  *
 731  * @param ConfigManager $conf          Configuration Manager instance.
 732  * @param PluginManager $pluginManager Plugin Manager instance,
 733  * @param LinkDB        $LINKSDB
 734  */
 735 function renderPage($conf, $pluginManager, $LINKSDB)
 736 {
 737     $updater = new Updater(
 738         read_updates_file($conf->get('resource.updates')),
 739         $LINKSDB,
 740         $conf,
 741         isLoggedIn()
 742     );
 743     try {
 744         $newUpdates = $updater->update();
 745         if (! empty($newUpdates)) {
 746             write_updates_file(
 747                 $conf->get('resource.updates'),
 748                 $updater->getDoneUpdates()
 749             );
 750         }
 751     }
 752     catch(Exception $e) {
 753         die($e->getMessage());
 754     }
 755
 756     $PAGE = new PageBuilder($conf);
 757     $PAGE->assign('linkcount', count($LINKSDB));
 758     $PAGE->assign('privateLinkcount', count_private($LINKSDB));
 759     $PAGE->assign('plugin_errors', $pluginManager->getErrors());
 760
 761     // Determine which page will be rendered.
 762     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
 763     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
 764
 765     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
 766     // Then assign generated data to RainTPL.
 767     $common_hooks = array(
 768         'includes',
 769         'header',
 770         'footer',
 771     );
 772
 773     foreach($common_hooks as $name) {
 774         $plugin_data = array();
 775         $pluginManager->executeHooks('render_' . $name, $plugin_data,
 776             array(
 777                 'target' => $targetPage,
 778                 'loggedin' => isLoggedIn()
 779             )
 780         );
 781         $PAGE->assign('plugins_' . $name, $plugin_data);
 782     }
 783
 784     // -------- Display login form.
 785     if ($targetPage == Router::$PAGE_LOGIN)
 786     {
 787         if ($conf->get('security.open_shaarli')) { header('Location: ?'); exit; }  // No need to login for open Shaarli
 788         if (isset($_GET['username'])) {
 789             $PAGE->assign('username', escape($_GET['username']));
 790         }
 791         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
 792         $PAGE->renderPage('loginform');
 793         exit;
 794     }
 795     // -------- User wants to logout.
 796     if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=logout'))
 797     {
 798         invalidateCaches($conf->get('resource.page_cache'));
 799         logout();
 800         header('Location: ?');
 801         exit;
 802     }
 803
 804     // -------- Picture wall
 805     if ($targetPage == Router::$PAGE_PICWALL)
 806     {
 807         // Optionally filter the results:
 808         $links = $LINKSDB->filterSearch($_GET);
 809         $linksToDisplay = array();
 810
 811         // Get only links which have a thumbnail.
 812         foreach($links as $link)
 813         {
 814             $permalink='?'.$link['shorturl'];
 815             $thumb=lazyThumbnail($conf, $link['url'],$permalink);
 816             if ($thumb!='') // Only output links which have a thumbnail.
 817             {
 818                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
 819                 $linksToDisplay[]=$link; // Add to array.
 820             }
 821         }
 822
 823         $data = array(
 824             'linksToDisplay' => $linksToDisplay,
 825         );
 826         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
 827
 828         foreach ($data as $key => $value) {
 829             $PAGE->assign($key, $value);
 830         }
 831
 832         $PAGE->renderPage('picwall');
 833         exit;
 834     }
 835
 836     // -------- Tag cloud
 837     if ($targetPage == Router::$PAGE_TAGCLOUD)
 838     {
 839         $tags= $LINKSDB->allTags();
 840
 841         // We sort tags alphabetically, then choose a font size according to count.
 842         // First, find max value.
 843         $maxcount = 0;
 844         foreach ($tags as $value) {
 845             $maxcount = max($maxcount, $value);
 846         }
 847
 848         // Sort tags alphabetically: case insensitive, support locale if available.
 849         uksort($tags, function($a, $b) {
 850             // Collator is part of PHP intl.
 851             if (class_exists('Collator')) {
 852                 $c = new Collator(setlocale(LC_COLLATE, 0));
 853                 if (!intl_is_failure(intl_get_error_code())) {
 854                     return $c->compare($a, $b);
 855                 }
 856             }
 857             return strcasecmp($a, $b);
 858         });
 859
 860         $tagList = array();
 861         foreach($tags as $key => $value) {
 862             // Tag font size scaling:
 863             //   default 15 and 30 logarithm bases affect scaling,
 864             //   22 and 6 are arbitrary font sizes for max and min sizes.
 865             $size = log($value, 15) / log($maxcount, 30) * 2.2 + 0.8;
 866             $tagList[$key] = array(
 867                 'count' => $value,
 868                 'size' => number_format($size, 2, '.', ''),
 869             );
 870         }
 871
 872         $data = array(
 873             'tags' => $tagList,
 874         );
 875         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
 876
 877         foreach ($data as $key => $value) {
 878             $PAGE->assign($key, $value);
 879         }
 880
 881         $PAGE->renderPage('tagcloud');
 882         exit;
 883     }
 884
 885     // Daily page.
 886     if ($targetPage == Router::$PAGE_DAILY) {
 887         showDaily($PAGE, $LINKSDB, $conf, $pluginManager);
 888     }
 889
 890     // ATOM and RSS feed.
 891     if ($targetPage == Router::$PAGE_FEED_ATOM || $targetPage == Router::$PAGE_FEED_RSS) {
 892         $feedType = $targetPage == Router::$PAGE_FEED_RSS ? FeedBuilder::$FEED_RSS : FeedBuilder::$FEED_ATOM;
 893         header('Content-Type: application/'. $feedType .'+xml; charset=utf-8');
 894
 895         // Cache system
 896         $query = $_SERVER['QUERY_STRING'];
 897         $cache = new CachedPage(
 898             $conf->get('resource.page_cache'),
 899             page_url($_SERVER),
 900             startsWith($query,'do='. $targetPage) && !isLoggedIn()
 901         );
 902         $cached = $cache->cachedVersion();
 903         if (!empty($cached)) {
 904             echo $cached;
 905             exit;
 906         }
 907
 908         // Generate data.
 909         $feedGenerator = new FeedBuilder($LINKSDB, $feedType, $_SERVER, $_GET, isLoggedIn());
 910         $feedGenerator->setLocale(strtolower(setlocale(LC_COLLATE, 0)));
 911         $feedGenerator->setHideDates($conf->get('privacy.hide_timestamps') && !isLoggedIn());
 912         $feedGenerator->setUsePermalinks(isset($_GET['permalinks']) || !$conf->get('feed.rss_permalinks'));
 913         $pshUrl = $conf->get('config.PUBSUBHUB_URL');
 914         if (!empty($pshUrl)) {
 915             $feedGenerator->setPubsubhubUrl($pshUrl);
 916         }
 917         $data = $feedGenerator->buildData();
 918
 919         // Process plugin hook.
 920         $pluginManager->executeHooks('render_feed', $data, array(
 921             'loggedin' => isLoggedIn(),
 922             'target' => $targetPage,
 923         ));
 924
 925         // Render the template.
 926         $PAGE->assignAll($data);
 927         $PAGE->renderPage('feed.'. $feedType);
 928         $cache->cache(ob_get_contents());
 929         ob_end_flush();
 930         exit;
 931     }
 932
 933     // Display opensearch plugin (XML)
 934     if ($targetPage == Router::$PAGE_OPENSEARCH) {
 935         header('Content-Type: application/xml; charset=utf-8');
 936         $PAGE->assign('serverurl', index_url($_SERVER));
 937         $PAGE->renderPage('opensearch');
 938         exit;
 939     }
 940
 941     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
 942     if (isset($_GET['addtag']))
 943     {
 944         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
 945         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
 946         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
 947
 948         // Prevent redirection loop
 949         if (isset($params['addtag'])) {
 950             unset($params['addtag']);
 951         }
 952
 953         // Check if this tag is already in the search query and ignore it if it is.
 954         // Each tag is always separated by a space
 955         if (isset($params['searchtags'])) {
 956             $current_tags = explode(' ', $params['searchtags']);
 957         } else {
 958             $current_tags = array();
 959         }
 960         $addtag = true;
 961         foreach ($current_tags as $value) {
 962             if ($value === $_GET['addtag']) {
 963                 $addtag = false;
 964                 break;
 965             }
 966         }
 967         // Append the tag if necessary
 968         if (empty($params['searchtags'])) {
 969             $params['searchtags'] = trim($_GET['addtag']);
 970         }
 971         else if ($addtag) {
 972             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
 973         }
 974
 975         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
 976         header('Location: ?'.http_build_query($params));
 977         exit;
 978     }
 979
 980     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
 981     if (isset($_GET['removetag'])) {
 982         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
 983         if (empty($_SERVER['HTTP_REFERER'])) {
 984             header('Location: ?');
 985             exit;
 986         }
 987
 988         // In case browser does not send HTTP_REFERER
 989         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
 990
 991         // Prevent redirection loop
 992         if (isset($params['removetag'])) {
 993             unset($params['removetag']);
 994         }
 995
 996         if (isset($params['searchtags'])) {
 997             $tags = explode(' ', $params['searchtags']);
 998             // Remove value from array $tags.
 999             $tags = array_diff($tags, array($_GET['removetag']));
1000             $params['searchtags'] = implode(' ',$tags);
1001
1002             if (empty($params['searchtags'])) {
1003                 unset($params['searchtags']);
1004             }
1005
1006             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1007         }
1008         header('Location: ?'.http_build_query($params));
1009         exit;
1010     }
1011
1012     // -------- User wants to change the number of links per page (linksperpage=...)
1013     if (isset($_GET['linksperpage'])) {
1014         if (is_numeric($_GET['linksperpage'])) {
1015             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1016         }
1017
1018         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1019         exit;
1020     }
1021
1022     // -------- User wants to see only private links (toggle)
1023     if (isset($_GET['privateonly'])) {
1024         if (empty($_SESSION['privateonly'])) {
1025             $_SESSION['privateonly'] = 1; // See only private links
1026         } else {
1027             unset($_SESSION['privateonly']); // See all links
1028         }
1029
1030         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1031         exit;
1032     }
1033
1034     // -------- Handle other actions allowed for non-logged in users:
1035     if (!isLoggedIn())
1036     {
1037         // User tries to post new link but is not logged in:
1038         // Show login screen, then redirect to ?post=...
1039         if (isset($_GET['post']))
1040         {
1041             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1042             exit;
1043         }
1044
1045         showLinkList($PAGE, $LINKSDB, $conf, $pluginManager);
1046         if (isset($_GET['edit_link'])) {
1047             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1048             exit;
1049         }
1050
1051         exit; // Never remove this one! All operations below are reserved for logged in user.
1052     }
1053
1054     // -------- All other functions are reserved for the registered user:
1055
1056     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1057     if ($targetPage == Router::$PAGE_TOOLS)
1058     {
1059         $data = array(
1060             'pageabsaddr' => index_url($_SERVER),
1061             'sslenabled' => !empty($_SERVER['HTTPS'])
1062         );
1063         $pluginManager->executeHooks('render_tools', $data);
1064
1065         foreach ($data as $key => $value) {
1066             $PAGE->assign($key, $value);
1067         }
1068
1069         $PAGE->renderPage('tools');
1070         exit;
1071     }
1072
1073     // -------- User wants to change his/her password.
1074     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1075     {
1076         if ($conf->get('security.open_shaarli')) {
1077             die('You are not supposed to change a password on an Open Shaarli.');
1078         }
1079
1080         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1081         {
1082             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1083
1084             // Make sure old password is correct.
1085             $oldhash = sha1($_POST['oldpassword'].$conf->get('credentials.login').$conf->get('credentials.salt'));
1086             if ($oldhash!= $conf->get('credentials.hash')) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1087             // Save new password
1088             // Salt renders rainbow-tables attacks useless.
1089             $conf->set('credentials.salt', sha1(uniqid('', true) .'_'. mt_rand()));
1090             $conf->set('credentials.hash', sha1($_POST['setpassword'] . $conf->get('credentials.login') . $conf->get('credentials.salt')));
1091             try {
1092                 $conf->write(isLoggedIn());
1093             }
1094             catch(Exception $e) {
1095                 error_log(
1096                     'ERROR while writing config file after changing password.' . PHP_EOL .
1097                     $e->getMessage()
1098                 );
1099
1100                 // TODO: do not handle exceptions/errors in JS.
1101                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1102                 exit;
1103             }
1104             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1105             exit;
1106         }
1107         else // show the change password form.
1108         {
1109             $PAGE->renderPage('changepassword');
1110             exit;
1111         }
1112     }
1113
1114     // -------- User wants to change configuration
1115     if ($targetPage == Router::$PAGE_CONFIGURE)
1116     {
1117         if (!empty($_POST['title']) )
1118         {
1119             if (!tokenOk($_POST['token'])) {
1120                 die('Wrong token.'); // Go away!
1121             }
1122             $tz = 'UTC';
1123             if (!empty($_POST['continent']) && !empty($_POST['city'])
1124                 && isTimeZoneValid($_POST['continent'], $_POST['city'])
1125             ) {
1126                 $tz = $_POST['continent'] . '/' . $_POST['city'];
1127             }
1128             $conf->set('general.timezone', $tz);
1129             $conf->set('general.title', escape($_POST['title']));
1130             $conf->set('general.header_link', escape($_POST['titleLink']));
1131             $conf->set('redirector.url', escape($_POST['redirector']));
1132             $conf->set('security.session_protection_disabled', !empty($_POST['disablesessionprotection']));
1133             $conf->set('privacy.default_private_links', !empty($_POST['privateLinkByDefault']));
1134             $conf->set('feed.rss_permalinks', !empty($_POST['enableRssPermalinks']));
1135             $conf->set('updates.check_updates', !empty($_POST['updateCheck']));
1136             $conf->set('privacy.hide_public_links', !empty($_POST['hidePublicLinks']));
1137             $conf->set('api.enabled', !empty($_POST['apiEnabled']));
1138             $conf->set('api.secret', escape($_POST['apiSecret']));
1139             try {
1140                 $conf->write(isLoggedIn());
1141             }
1142             catch(Exception $e) {
1143                 error_log(
1144                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1145                     $e->getMessage()
1146                 );
1147
1148                 // TODO: do not handle exceptions/errors in JS.
1149                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=configure\';</script>';
1150                 exit;
1151             }
1152             echo '<script>alert("Configuration was saved.");document.location=\'?do=configure\';</script>';
1153             exit;
1154         }
1155         else // Show the configuration form.
1156         {
1157             $PAGE->assign('title', $conf->get('general.title'));
1158             $PAGE->assign('redirector', $conf->get('redirector.url'));
1159             list($timezone_form, $timezone_js) = generateTimeZoneForm($conf->get('general.timezone'));
1160             $PAGE->assign('timezone_form', $timezone_form);
1161             $PAGE->assign('timezone_js',$timezone_js);
1162             $PAGE->assign('private_links_default', $conf->get('privacy.default_private_links', false));
1163             $PAGE->assign('session_protection_disabled', $conf->get('security.session_protection_disabled', false));
1164             $PAGE->assign('enable_rss_permalinks', $conf->get('feed.rss_permalinks', false));
1165             $PAGE->assign('enable_update_check', $conf->get('updates.check_updates', true));
1166             $PAGE->assign('hide_public_links', $conf->get('privacy.hide_public_links', false));
1167             $PAGE->assign('api_enabled', $conf->get('api.enabled', true));
1168             $PAGE->assign('api_secret', $conf->get('api.secret'));
1169             $PAGE->renderPage('configure');
1170             exit;
1171         }
1172     }
1173
1174     // -------- User wants to rename a tag or delete it
1175     if ($targetPage == Router::$PAGE_CHANGETAG)
1176     {
1177         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1178             $PAGE->assign('tags', $LINKSDB->allTags());
1179             $PAGE->renderPage('changetag');
1180             exit;
1181         }
1182
1183         if (!tokenOk($_POST['token'])) {
1184             die('Wrong token.');
1185         }
1186
1187         // Delete a tag:
1188         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1189             $needle = trim($_POST['fromtag']);
1190             // True for case-sensitive tag search.
1191             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1192             foreach($linksToAlter as $key=>$value)
1193             {
1194                 $tags = explode(' ',trim($value['tags']));
1195                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1196                 $value['tags']=trim(implode(' ',$tags));
1197                 $LINKSDB[$key]=$value;
1198             }
1199             $LINKSDB->save($conf->get('resource.page_cache'));
1200             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1201             exit;
1202         }
1203
1204         // Rename a tag:
1205         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1206             $needle = trim($_POST['fromtag']);
1207             // True for case-sensitive tag search.
1208             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1209             foreach($linksToAlter as $key=>$value)
1210             {
1211                 $tags = explode(' ',trim($value['tags']));
1212                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1213                 $value['tags']=trim(implode(' ',$tags));
1214                 $LINKSDB[$key]=$value;
1215             }
1216             $LINKSDB->save($conf->get('resource.page_cache')); // Save to disk.
1217             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1218             exit;
1219         }
1220     }
1221
1222     // -------- User wants to add a link without using the bookmarklet: Show form.
1223     if ($targetPage == Router::$PAGE_ADDLINK)
1224     {
1225         $PAGE->renderPage('addlink');
1226         exit;
1227     }
1228
1229     // -------- User clicked the "Save" button when editing a link: Save link to database.
1230     if (isset($_POST['save_edit']))
1231     {
1232         // Go away!
1233         if (! tokenOk($_POST['token'])) {
1234             die('Wrong token.');
1235         }
1236
1237         // lf_id should only be present if the link exists.
1238         $id = !empty($_POST['lf_id']) ? intval(escape($_POST['lf_id'])) : $LINKSDB->getNextId();
1239         // Linkdate is kept here to:
1240         //   - use the same permalink for notes as they're displayed when creating them
1241         //   - let users hack creation date of their posts
1242         //     See: https://github.com/shaarli/Shaarli/wiki/Datastore-hacks#changing-the-timestamp-for-a-link
1243         $linkdate = escape($_POST['lf_linkdate']);
1244         if (isset($LINKSDB[$id])) {
1245             // Edit
1246             $created = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $linkdate);
1247             $updated = new DateTime();
1248         } else {
1249             // New link
1250             $created = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $linkdate);
1251             $updated = null;
1252         }
1253
1254         // Remove multiple spaces.
1255         $tags = trim(preg_replace('/\s\s+/', ' ', $_POST['lf_tags']));
1256         // Remove first '-' char in tags.
1257         $tags = preg_replace('/(^| )\-/', '$1', $tags);
1258         // Remove duplicates.
1259         $tags = implode(' ', array_unique(explode(' ', $tags)));
1260
1261         $url = trim($_POST['lf_url']);
1262         if (! startsWith($url, 'http:') && ! startsWith($url, 'https:')
1263             && ! startsWith($url, 'ftp:') && ! startsWith($url, 'magnet:')
1264             && ! startsWith($url, '?') && ! startsWith($url, 'javascript:')
1265         ) {
1266             $url = 'http://' . $url;
1267         }
1268
1269         $link = array(
1270             'id' => $id,
1271             'title' => trim($_POST['lf_title']),
1272             'url' => $url,
1273             'description' => $_POST['lf_description'],
1274             'private' => (isset($_POST['lf_private']) ? 1 : 0),
1275             'created' => $created,
1276             'updated' => $updated,
1277             'tags' => str_replace(',', ' ', $tags),
1278             'shorturl' => link_small_hash($created, $id),
1279         );
1280
1281         // If title is empty, use the URL as title.
1282         if ($link['title'] == '') {
1283             $link['title'] = $link['url'];
1284         }
1285
1286         $pluginManager->executeHooks('save_link', $link);
1287
1288         $LINKSDB[$id] = $link;
1289         $LINKSDB->save($conf->get('resource.page_cache'));
1290         pubsubhub($conf);
1291
1292         // If we are called from the bookmarklet, we must close the popup:
1293         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1294             echo '<script>self.close();</script>';
1295             exit;
1296         }
1297
1298         $returnurl = !empty($_POST['returnurl']) ? $_POST['returnurl'] : '?';
1299         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1300         // Scroll to the link which has been edited.
1301         $location .= '#' . $link['shorturl'];
1302         // After saving the link, redirect to the page the user was on.
1303         header('Location: '. $location);
1304         exit;
1305     }
1306
1307     // -------- User clicked the "Cancel" button when editing a link.
1308     if (isset($_POST['cancel_edit']))
1309     {
1310         // If we are called from the bookmarklet, we must close the popup:
1311         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1312         $link = $LINKSDB[(int) escape($_POST['lf_id'])];
1313         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1314         // Scroll to the link which has been edited.
1315         $returnurl .= '#'. $link['shorturl'];
1316         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1317         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1318         exit;
1319     }
1320
1321     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1322     if (isset($_POST['delete_link']))
1323     {
1324         if (!tokenOk($_POST['token'])) die('Wrong token.');
1325
1326         // We do not need to ask for confirmation:
1327         // - confirmation is handled by JavaScript
1328         // - we are protected from XSRF by the token.
1329
1330         // FIXME! We keep `lf_linkdate` for consistency before a proper API. To be removed.
1331         $id = isset($_POST['lf_id']) ? intval(escape($_POST['lf_id'])) : intval(escape($_POST['lf_linkdate']));
1332
1333         $pluginManager->executeHooks('delete_link', $LINKSDB[$id]);
1334
1335         unset($LINKSDB[$id]);
1336         $LINKSDB->save('resource.page_cache'); // save to disk
1337
1338         // If we are called from the bookmarklet, we must close the popup:
1339         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1340         // Pick where we're going to redirect
1341         // =============================================================
1342         // Basically, we can't redirect to where we were previously if it was a permalink
1343         // or an edit_link, because it would 404.
1344         // Cases:
1345         //    - /             : nothing in $_GET, redirect to self
1346         //    - /?page        : redirect to self
1347         //    - /?searchterm  : redirect to self (there might be other links)
1348         //    - /?searchtags  : redirect to self
1349         //    - /permalink    : redirect to / (the link does not exist anymore)
1350         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1351         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1352         // redirect is not satisfied, and only then redirect to /
1353         $location = "?";
1354         // Self redirection
1355         if (count($_GET) == 0
1356             || isset($_GET['page'])
1357             || isset($_GET['searchterm'])
1358             || isset($_GET['searchtags'])
1359         ) {
1360             if (isset($_POST['returnurl'])) {
1361                 $location = $_POST['returnurl']; // Handle redirects given by the form
1362             } else {
1363                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1364             }
1365         }
1366
1367         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1368         exit;
1369     }
1370
1371     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1372     if (isset($_GET['edit_link']))
1373     {
1374         $id = (int) escape($_GET['edit_link']);
1375         $link = $LINKSDB[$id];  // Read database
1376         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1377         $link['linkdate'] = $link['created']->format(LinkDB::LINK_DATE_FORMAT);
1378         $data = array(
1379             'link' => $link,
1380             'link_is_new' => false,
1381             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1382             'tags' => $LINKSDB->allTags(),
1383         );
1384         $pluginManager->executeHooks('render_editlink', $data);
1385
1386         foreach ($data as $key => $value) {
1387             $PAGE->assign($key, $value);
1388         }
1389
1390         $PAGE->renderPage('editlink');
1391         exit;
1392     }
1393
1394     // -------- User want to post a new link: Display link edit form.
1395     if (isset($_GET['post'])) {
1396         $url = cleanup_url($_GET['post']);
1397
1398         $link_is_new = false;
1399         // Check if URL is not already in database (in this case, we will edit the existing link)
1400         $link = $LINKSDB->getLinkFromUrl($url);
1401         if (! $link)
1402         {
1403             $link_is_new = true;
1404             $linkdate = strval(date(LinkDB::LINK_DATE_FORMAT));
1405             // Get title if it was provided in URL (by the bookmarklet).
1406             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1407             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1408             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1409             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1410             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1411             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1412             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1413                 // Short timeout to keep the application responsive
1414                 list($headers, $content) = get_http_response($url, 4);
1415                 if (strpos($headers[0], '200 OK') !== false) {
1416                     // Retrieve charset.
1417                     $charset = get_charset($headers, $content);
1418                     // Extract title.
1419                     $title = html_extract_title($content);
1420                     // Re-encode title in utf-8 if necessary.
1421                     if (! empty($title) && strtolower($charset) != 'utf-8') {
1422                         $title = mb_convert_encoding($title, 'utf-8', $charset);
1423                     }
1424                 }
1425             }
1426
1427             if ($url == '') {
1428                 $url = '?' . smallHash($linkdate . $LINKSDB->getNextId());
1429                 $title = 'Note: ';
1430             }
1431             $url = escape($url);
1432             $title = escape($title);
1433
1434             $link = array(
1435                 'linkdate' => $linkdate,
1436                 'title' => $title,
1437                 'url' => $url,
1438                 'description' => $description,
1439                 'tags' => $tags,
1440                 'private' => $private
1441             );
1442         } else {
1443             $link['linkdate'] = $link['created']->format(LinkDB::LINK_DATE_FORMAT);
1444         }
1445
1446         $data = array(
1447             'link' => $link,
1448             'link_is_new' => $link_is_new,
1449             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1450             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1451             'tags' => $LINKSDB->allTags(),
1452             'default_private_links' => $conf->get('privacy.default_private_links', false),
1453         );
1454         $pluginManager->executeHooks('render_editlink', $data);
1455
1456         foreach ($data as $key => $value) {
1457             $PAGE->assign($key, $value);
1458         }
1459
1460         $PAGE->renderPage('editlink');
1461         exit;
1462     }
1463
1464     if ($targetPage == Router::$PAGE_EXPORT) {
1465         // Export links as a Netscape Bookmarks file
1466
1467         if (empty($_GET['selection'])) {
1468             $PAGE->renderPage('export');
1469             exit;
1470         }
1471
1472         // export as bookmarks_(all|private|public)_YYYYmmdd_HHMMSS.html
1473         $selection = $_GET['selection'];
1474         if (isset($_GET['prepend_note_url'])) {
1475             $prependNoteUrl = $_GET['prepend_note_url'];
1476         } else {
1477             $prependNoteUrl = false;
1478         }
1479
1480         try {
1481             $PAGE->assign(
1482                 'links',
1483                 NetscapeBookmarkUtils::filterAndFormat(
1484                     $LINKSDB,
1485                     $selection,
1486                     $prependNoteUrl,
1487                     index_url($_SERVER)
1488                 )
1489             );
1490         } catch (Exception $exc) {
1491             header('Content-Type: text/plain; charset=utf-8');
1492             echo $exc->getMessage();
1493             exit;
1494         }
1495         $now = new DateTime();
1496         header('Content-Type: text/html; charset=utf-8');
1497         header(
1498             'Content-disposition: attachment; filename=bookmarks_'
1499            .$selection.'_'.$now->format(LinkDB::LINK_DATE_FORMAT).'.html'
1500         );
1501         $PAGE->assign('date', $now->format(DateTime::RFC822));
1502         $PAGE->assign('eol', PHP_EOL);
1503         $PAGE->assign('selection', $selection);
1504         $PAGE->renderPage('export.bookmarks');
1505         exit;
1506     }
1507
1508     if ($targetPage == Router::$PAGE_IMPORT) {
1509         // Upload a Netscape bookmark dump to import its contents
1510
1511         if (! isset($_POST['token']) || ! isset($_FILES['filetoupload'])) {
1512             // Show import dialog
1513             $PAGE->assign('maxfilesize', getMaxFileSize());
1514             $PAGE->renderPage('import');
1515             exit;
1516         }
1517
1518         // Import bookmarks from an uploaded file
1519         if (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size'] == 0) {
1520             // The file is too big or some form field may be missing.
1521             echo '<script>alert("The file you are trying to upload is probably'
1522                 .' bigger than what this webserver can accept ('
1523                 .getMaxFileSize().' bytes).'
1524                 .' Please upload in smaller chunks.");document.location=\'?do='
1525                 .Router::$PAGE_IMPORT .'\';</script>';
1526             exit;
1527         }
1528         if (! tokenOk($_POST['token'])) {
1529             die('Wrong token.');
1530         }
1531         $status = NetscapeBookmarkUtils::import(
1532             $_POST,
1533             $_FILES,
1534             $LINKSDB,
1535             $conf->get('resource.page_cache')
1536         );
1537         echo '<script>alert("'.$status.'");document.location=\'?do='
1538              .Router::$PAGE_IMPORT .'\';</script>';
1539         exit;
1540     }
1541
1542     // Plugin administration page
1543     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1544         $pluginMeta = $pluginManager->getPluginsMeta();
1545
1546         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1547         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1548         // Load parameters.
1549         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $conf->get('plugins', array()));
1550         uasort(
1551             $enabledPlugins,
1552             function($a, $b) { return $a['order'] - $b['order']; }
1553         );
1554         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1555
1556         $PAGE->assign('enabledPlugins', $enabledPlugins);
1557         $PAGE->assign('disabledPlugins', $disabledPlugins);
1558         $PAGE->renderPage('pluginsadmin');
1559         exit;
1560     }
1561
1562     // Plugin administration form action
1563     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1564         try {
1565             if (isset($_POST['parameters_form'])) {
1566                 unset($_POST['parameters_form']);
1567                 foreach ($_POST as $param => $value) {
1568                     $conf->set('plugins.'. $param, escape($value));
1569                 }
1570             }
1571             else {
1572                 $conf->set('general.enabled_plugins', save_plugin_config($_POST));
1573             }
1574             $conf->write(isLoggedIn());
1575         }
1576         catch (Exception $e) {
1577             error_log(
1578                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1579                 $e->getMessage()
1580             );
1581
1582             // TODO: do not handle exceptions/errors in JS.
1583             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do='. Router::$PAGE_PLUGINSADMIN .'\';</script>';
1584             exit;
1585         }
1586         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1587         exit;
1588     }
1589
1590     // -------- Otherwise, simply display search form and links:
1591     showLinkList($PAGE, $LINKSDB, $conf, $pluginManager);
1592     exit;
1593 }
1594
1595 /**
1596  * Template for the list of links (<div id="linklist">)
1597  * This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1598  *
1599  * @param pageBuilder   $PAGE          pageBuilder instance.
1600  * @param LinkDB        $LINKSDB       LinkDB instance.
1601  * @param ConfigManager $conf          Configuration Manager instance.
1602  * @param PluginManager $pluginManager Plugin Manager instance.
1603  */
1604 function buildLinkList($PAGE,$LINKSDB, $conf, $pluginManager)
1605 {
1606     // Used in templates
1607     $searchtags = !empty($_GET['searchtags']) ? escape($_GET['searchtags']) : '';
1608     $searchterm = !empty($_GET['searchterm']) ? escape($_GET['searchterm']) : '';
1609
1610     // Smallhash filter
1611     if (! empty($_SERVER['QUERY_STRING'])
1612         && preg_match('/^[a-zA-Z0-9-_@]{6}($|&|#)/', $_SERVER['QUERY_STRING'])) {
1613         try {
1614             $linksToDisplay = $LINKSDB->filterHash($_SERVER['QUERY_STRING']);
1615         } catch (LinkNotFoundException $e) {
1616             $PAGE->render404($e->getMessage());
1617             exit;
1618         }
1619     } else {
1620         // Filter links according search parameters.
1621         $privateonly = !empty($_SESSION['privateonly']);
1622         $linksToDisplay = $LINKSDB->filterSearch($_GET, false, $privateonly);
1623     }
1624
1625     // ---- Handle paging.
1626     $keys = array();
1627     foreach ($linksToDisplay as $key => $value) {
1628         $keys[] = $key;
1629     }
1630
1631
1632
1633     // Select articles according to paging.
1634     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1635     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1636     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1637     $page = $page < 1 ? 1 : $page;
1638     $page = $page > $pagecount ? $pagecount : $page;
1639     // Start index.
1640     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1641     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1642     $linkDisp = array();
1643     while ($i<$end && $i<count($keys))
1644     {
1645         $link = $linksToDisplay[$keys[$i]];
1646         $link['description'] = format_description($link['description'], $conf->get('redirector.url'));
1647         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
1648         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
1649         $link['timestamp'] = $link['created']->getTimestamp();
1650         if (! empty($link['updated'])) {
1651             $link['updated_timestamp'] = $link['updated']->getTimestamp();
1652         } else {
1653             $link['updated_timestamp'] = '';
1654         }
1655         $taglist = explode(' ', $link['tags']);
1656         uasort($taglist, 'strcasecmp');
1657         $link['taglist'] = $taglist;
1658         // Check for both signs of a note: starting with ? and 7 chars long.
1659         if ($link['url'][0] === '?' &&
1660             strlen($link['url']) === 7) {
1661             $link['url'] = index_url($_SERVER) . $link['url'];
1662         }
1663
1664         $linkDisp[$keys[$i]] = $link;
1665         $i++;
1666     }
1667
1668     // Compute paging navigation
1669     $searchtagsUrl = empty($searchtags) ? '' : '&searchtags=' . urlencode($searchtags);
1670     $searchtermUrl = empty($searchterm) ? '' : '&searchterm=' . urlencode($searchterm);
1671     $previous_page_url = '';
1672     if ($i != count($keys)) {
1673         $previous_page_url = '?page=' . ($page+1) . $searchtermUrl . $searchtagsUrl;
1674     }
1675     $next_page_url='';
1676     if ($page>1) {
1677         $next_page_url = '?page=' . ($page-1) . $searchtermUrl . $searchtagsUrl;
1678     }
1679
1680     // Fill all template fields.
1681     $data = array(
1682         'previous_page_url' => $previous_page_url,
1683         'next_page_url' => $next_page_url,
1684         'page_current' => $page,
1685         'page_max' => $pagecount,
1686         'result_count' => count($linksToDisplay),
1687         'search_term' => $searchterm,
1688         'search_tags' => $searchtags,
1689         'redirector' => $conf->get('redirector.url'),  // Optional redirector URL.
1690         'links' => $linkDisp,
1691         'tags' => $LINKSDB->allTags(),
1692     );
1693
1694     // If there is only a single link, we change on-the-fly the title of the page.
1695     if (count($linksToDisplay) == 1) {
1696         $data['pagetitle'] = $linksToDisplay[$keys[0]]['title'] .' - '. $conf->get('general.title');
1697     }
1698
1699     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
1700
1701     foreach ($data as $key => $value) {
1702         $PAGE->assign($key, $value);
1703     }
1704
1705     return;
1706 }
1707
1708 /**
1709  * Compute the thumbnail for a link.
1710  *
1711  * With a link to the original URL.
1712  * Understands various services (youtube.com...)
1713  * Input: $url = URL for which the thumbnail must be found.
1714  *        $href = if provided, this URL will be followed instead of $url
1715  * Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1716  * Some of them may be missing.
1717  * Return an empty array if no thumbnail available.
1718  *
1719  * @param ConfigManager $conf Configuration Manager instance.
1720  * @param string        $url
1721  * @param string|bool   $href
1722  *
1723  * @return array
1724  */
1725 function computeThumbnail($conf, $url, $href = false)
1726 {
1727     if (!$conf->get('thumbnail.enable_thumbnails')) return array();
1728     if ($href==false) $href=$url;
1729
1730     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1731     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1732     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1733     $domain = parse_url($url,PHP_URL_HOST);
1734     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1735     {
1736         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1737         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1738                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1739     }
1740     if ($domain=='youtu.be') // Youtube short links
1741     {
1742         $path = parse_url($url,PHP_URL_PATH);
1743         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1744                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1745     }
1746     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1747     {
1748         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1749         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1750                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1751     }
1752
1753     if ($domain=='imgur.com')
1754     {
1755         $path = parse_url($url,PHP_URL_PATH);
1756         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1757         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1758                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1759         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1760                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1761
1762         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1763                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1764     }
1765     if ($domain=='i.imgur.com')
1766     {
1767         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1768         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1769                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1770     }
1771     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1772     {
1773         if (strpos($url,'dailymotion.com/video/')!==false)
1774         {
1775             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1776             return array('src'=>$thumburl,
1777                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1778         }
1779     }
1780     if (endsWith($domain,'.imageshack.us'))
1781     {
1782         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1783         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1784         {
1785             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1786             return array('src'=>$thumburl,
1787                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1788         }
1789     }
1790
1791     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1792     // So we deport the thumbnail generation in order not to slow down page generation
1793     // (and we also cache the thumbnail)
1794
1795     if (! $conf->get('thumbnail.enable_localcache')) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1796
1797     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1798         || $domain=='vimeo.com'
1799         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1800         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1801     )
1802     {
1803         if ($domain=='vimeo.com')
1804         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1805             $path = parse_url($url,PHP_URL_PATH);
1806             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1807         }
1808         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
1809         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
1810             $path = parse_url($url,PHP_URL_PATH);
1811             if (!preg_match('!/\d+.+?!',$path)) return array();
1812         }
1813         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
1814         {   // Make sure this TED URL points to a video (/talks/...)
1815             $path = parse_url($url,PHP_URL_PATH);
1816             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
1817         }
1818         $sign = hash_hmac('sha256', $url, $conf->get('credentials.salt')); // We use the salt to sign data (it's random, secret, and specific to each installation)
1819         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1820                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1821     }
1822
1823     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1824     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1825     // But using the extension will do.
1826     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1827     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1828     {
1829         $sign = hash_hmac('sha256', $url, $conf->get('credentials.salt')); // We use the salt to sign data (it's random, secret, and specific to each installation)
1830         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1831                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1832     }
1833     return array(); // No thumbnail.
1834
1835 }
1836
1837
1838 // Returns the HTML code to display a thumbnail for a link
1839 // with a link to the original URL.
1840 // Understands various services (youtube.com...)
1841 // Input: $url = URL for which the thumbnail must be found.
1842 //        $href = if provided, this URL will be followed instead of $url
1843 // Returns '' if no thumbnail available.
1844 function thumbnail($url,$href=false)
1845 {
1846     // FIXME!
1847     global $conf;
1848     $t = computeThumbnail($conf, $url,$href);
1849     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1850
1851     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
1852     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1853     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1854     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1855     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1856     $html.='></a>';
1857     return $html;
1858 }
1859
1860 // Returns the HTML code to display a thumbnail for a link
1861 // for the picture wall (using lazy image loading)
1862 // Understands various services (youtube.com...)
1863 // Input: $url = URL for which the thumbnail must be found.
1864 //        $href = if provided, this URL will be followed instead of $url
1865 // Returns '' if no thumbnail available.
1866 function lazyThumbnail($conf, $url,$href=false)
1867 {
1868     // FIXME!
1869     global $conf;
1870     $t = computeThumbnail($conf, $url,$href);
1871     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1872
1873     $html='<a href="'.escape($t['href']).'">';
1874
1875     // Lazy image
1876     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
1877
1878     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1879     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1880     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1881     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1882     $html.='>';
1883
1884     // No-JavaScript fallback.
1885     $html.='<noscript><img src="'.escape($t['src']).'"';
1886     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1887     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1888     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1889     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1890     $html.='></noscript></a>';
1891
1892     return $html;
1893 }
1894
1895
1896 /**
1897  * Installation
1898  * This function should NEVER be called if the file data/config.php exists.
1899  *
1900  * @param ConfigManager $conf Configuration Manager instance.
1901  */
1902 function install($conf)
1903 {
1904     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
1905     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
1906
1907
1908     // This part makes sure sessions works correctly.
1909     // (Because on some hosts, session.save_path may not be set correctly,
1910     // or we may not have write access to it.)
1911     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
1912     {   // Step 2: Check if data in session is correct.
1913         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
1914         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
1915         echo 'It currently points to '.session_save_path().'<br>';
1916         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
1917         echo '<br><a href="?">Click to try again.</a></pre>';
1918         die;
1919     }
1920     if (!isset($_SESSION['session_tested']))
1921     {   // Step 1 : Try to store data in session and reload page.
1922         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
1923         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
1924     }
1925     if (isset($_GET['test_session']))
1926     {   // Step 3: Sessions are OK. Remove test parameter from URL.
1927         header('Location: '.index_url($_SERVER));
1928     }
1929
1930
1931     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
1932     {
1933         $tz = 'UTC';
1934         if (!empty($_POST['continent']) && !empty($_POST['city'])
1935             && isTimeZoneValid($_POST['continent'], $_POST['city'])
1936         ) {
1937             $tz = $_POST['continent'].'/'.$_POST['city'];
1938         }
1939         $conf->set('general.timezone', $tz);
1940         $login = $_POST['setlogin'];
1941         $conf->set('credentials.login', $login);
1942         $salt = sha1(uniqid('', true) .'_'. mt_rand());
1943         $conf->set('credentials.salt', $salt);
1944         $conf->set('credentials.hash', sha1($_POST['setpassword'] . $login . $salt));
1945         if (!empty($_POST['title'])) {
1946             $conf->set('general.title', escape($_POST['title']));
1947         } else {
1948             $conf->set('general.title', 'Shared links on '.escape(index_url($_SERVER)));
1949         }
1950         $conf->set('updates.check_updates', !empty($_POST['updateCheck']));
1951         $conf->set('api.enabled', !empty($_POST['enableApi']));
1952         $conf->set(
1953             'api.secret',
1954             generate_api_secret(
1955                 $this->conf->get('credentials.login'),
1956                 $this->conf->get('credentials.salt')
1957             )
1958         );
1959         try {
1960             // Everything is ok, let's create config file.
1961             $conf->write(isLoggedIn());
1962         }
1963         catch(Exception $e) {
1964             error_log(
1965                     'ERROR while writing config file after installation.' . PHP_EOL .
1966                     $e->getMessage()
1967                 );
1968
1969             // TODO: do not handle exceptions/errors in JS.
1970             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
1971             exit;
1972         }
1973         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
1974         exit;
1975     }
1976
1977     // Display config form:
1978     list($timezone_form, $timezone_js) = generateTimeZoneForm();
1979     $timezone_html = '';
1980     if ($timezone_form != '') {
1981         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
1982     }
1983
1984     $PAGE = new PageBuilder($conf);
1985     $PAGE->assign('timezone_html',$timezone_html);
1986     $PAGE->assign('timezone_js',$timezone_js);
1987     $PAGE->renderPage('install');
1988     exit;
1989 }
1990
1991 /**
1992  * Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
1993  * I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
1994  * The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
1995  * This function is called by passing the URL:
1996  * http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
1997  * [URL] is the URL of the link (e.g. a flickr page)
1998  * [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
1999  * The function below will fetch the image from the webservice and store it in the cache.
2000  *
2001  * @param ConfigManager $conf Configuration Manager instance,
2002  */
2003 function genThumbnail($conf)
2004 {
2005     // Make sure the parameters in the URL were generated by us.
2006     $sign = hash_hmac('sha256', $_GET['url'], $conf->get('credentials.salt'));
2007     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2008
2009     $cacheDir = $conf->get('resource.thumbnails_cache', 'cache');
2010     // Let's see if we don't already have the image for this URL in the cache.
2011     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2012     if (is_file($cacheDir .'/'. $thumbname))
2013     {   // We have the thumbnail, just serve it:
2014         header('Content-Type: image/jpeg');
2015         echo file_get_contents($cacheDir .'/'. $thumbname);
2016         return;
2017     }
2018     // We may also serve a blank image (if service did not respond)
2019     $blankname=hash('sha1',$_GET['url']).'.gif';
2020     if (is_file($cacheDir .'/'. $blankname))
2021     {
2022         header('Content-Type: image/gif');
2023         echo file_get_contents($cacheDir .'/'. $blankname);
2024         return;
2025     }
2026
2027     // Otherwise, generate the thumbnail.
2028     $url = $_GET['url'];
2029     $domain = parse_url($url,PHP_URL_HOST);
2030
2031     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2032     {
2033         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2034         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2035
2036         // Is this a link to an image, or to a flickr page ?
2037         $imageurl='';
2038         if (endsWith(parse_url($url, PHP_URL_PATH), '.jpg'))
2039         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2040             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2041             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2042         }
2043         else // This is a flickr page (html)
2044         {
2045             // Get the flickr html page.
2046             list($headers, $content) = get_http_response($url, 20);
2047             if (strpos($headers[0], '200 OK') !== false)
2048             {
2049                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2050                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2051                 if (!empty($matches[1])) $imageurl=$matches[1];
2052
2053                 // In albums (and some other pages), the link rel="image_src" is not provided,
2054                 // but flickr provides:
2055                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2056                 if ($imageurl=='')
2057                 {
2058                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2059                     if (!empty($matches[1])) $imageurl=$matches[1];
2060                 }
2061             }
2062         }
2063
2064         if ($imageurl!='')
2065         {   // Let's download the image.
2066             // Image is 240x120, so 10 seconds to download should be enough.
2067             list($headers, $content) = get_http_response($imageurl, 10);
2068             if (strpos($headers[0], '200 OK') !== false) {
2069                 // Save image to cache.
2070                 file_put_contents($cacheDir .'/'. $thumbname, $content);
2071                 header('Content-Type: image/jpeg');
2072                 echo $content;
2073                 return;
2074             }
2075         }
2076     }
2077
2078     elseif ($domain=='vimeo.com' )
2079     {
2080         // This is more complex: we have to perform a HTTP request, then parse the result.
2081         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2082         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2083         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2084         if (strpos($headers[0], '200 OK') !== false) {
2085             $t = unserialize($content);
2086             $imageurl = $t[0]['thumbnail_medium'];
2087             // Then we download the image and serve it to our client.
2088             list($headers, $content) = get_http_response($imageurl, 10);
2089             if (strpos($headers[0], '200 OK') !== false) {
2090                 // Save image to cache.
2091                 file_put_contents($cacheDir .'/'. $thumbname, $content);
2092                 header('Content-Type: image/jpeg');
2093                 echo $content;
2094                 return;
2095             }
2096         }
2097     }
2098
2099     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2100     {
2101         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2102         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2103         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2104         list($headers, $content) = get_http_response($url, 5);
2105         if (strpos($headers[0], '200 OK') !== false) {
2106             // Extract the link to the thumbnail
2107             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2108             if (!empty($matches[1]))
2109             {   // Let's download the image.
2110                 $imageurl=$matches[1];
2111                 // No control on image size, so wait long enough
2112                 list($headers, $content) = get_http_response($imageurl, 20);
2113                 if (strpos($headers[0], '200 OK') !== false) {
2114                     $filepath = $cacheDir .'/'. $thumbname;
2115                     file_put_contents($filepath, $content); // Save image to cache.
2116                     if (resizeImage($filepath))
2117                     {
2118                         header('Content-Type: image/jpeg');
2119                         echo file_get_contents($filepath);
2120                         return;
2121                     }
2122                 }
2123             }
2124         }
2125     }
2126
2127     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2128     {
2129         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2130         // http://xkcd.com/327/
2131         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2132         list($headers, $content) = get_http_response($url, 5);
2133         if (strpos($headers[0], '200 OK') !== false) {
2134             // Extract the link to the thumbnail
2135             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2136             if (!empty($matches[1]))
2137             {   // Let's download the image.
2138                 $imageurl=$matches[1];
2139                 // No control on image size, so wait long enough
2140                 list($headers, $content) = get_http_response($imageurl, 20);
2141                 if (strpos($headers[0], '200 OK') !== false) {
2142                     $filepath = $cacheDir.'/'.$thumbname;
2143                     // Save image to cache.
2144                     file_put_contents($filepath, $content);
2145                     if (resizeImage($filepath))
2146                     {
2147                         header('Content-Type: image/jpeg');
2148                         echo file_get_contents($filepath);
2149                         return;
2150                     }
2151                 }
2152             }
2153         }
2154     }
2155
2156     else
2157     {
2158         // For all other domains, we try to download the image and make a thumbnail.
2159         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2160         list($headers, $content) = get_http_response($url, 30);
2161         if (strpos($headers[0], '200 OK') !== false) {
2162             $filepath = $cacheDir .'/'.$thumbname;
2163             // Save image to cache.
2164             file_put_contents($filepath, $content);
2165             if (resizeImage($filepath))
2166             {
2167                 header('Content-Type: image/jpeg');
2168                 echo file_get_contents($filepath);
2169                 return;
2170             }
2171         }
2172     }
2173
2174
2175     // Otherwise, return an empty image (8x8 transparent gif)
2176     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2177     // Also put something in cache so that this URL is not requested twice.
2178     file_put_contents($cacheDir .'/'. $blankname, $blankgif);
2179     header('Content-Type: image/gif');
2180     echo $blankgif;
2181 }
2182
2183 // Make a thumbnail of the image (to width: 120 pixels)
2184 // Returns true if success, false otherwise.
2185 function resizeImage($filepath)
2186 {
2187     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2188
2189     // Trick: some stupid people rename GIF as JPEG... or else.
2190     // So we really try to open each image type whatever the extension is.
2191     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2192     $im=false;
2193     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2194     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2195     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2196     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2197     $w = imagesx($im);
2198     $h = imagesy($im);
2199     $ystart = 0; $yheight=$h;
2200     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2201     $nw = 120;   // Desired width
2202     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2203     // Resize image:
2204     $im2 = imagecreatetruecolor($nw,$nh);
2205     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2206     imageinterlace($im2,true); // For progressive JPEG.
2207     $tempname=$filepath.'_TEMP.jpg';
2208     imagejpeg($im2, $tempname, 90);
2209     imagedestroy($im);
2210     imagedestroy($im2);
2211     unlink($filepath);
2212     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2213     return true;
2214 }
2215
2216 if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=genthumbnail')) { genThumbnail($conf); exit; }  // Thumbnail generation/cache does not need the link database.
2217 if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=dailyrss')) { showDailyRSS($conf); exit; }
2218 if (!isset($_SESSION['LINKS_PER_PAGE'])) {
2219     $_SESSION['LINKS_PER_PAGE'] = $conf->get('general.links_per_page', 20);
2220 }
2221
2222 $linkDb = new LinkDB(
2223     $conf->get('resource.datastore'),
2224     isLoggedIn(),
2225     $conf->get('privacy.hide_public_links'),
2226     $conf->get('redirector.url'),
2227     $conf->get('redirector.encode_url')
2228 );
2229
2230 $container = new \Slim\Container();
2231 $container['conf'] = $conf;
2232 $container['plugins'] = $pluginManager;
2233 $app = new \Slim\App($container);
2234
2235 // REST API routes
2236 $app->group('/api/v1', function() {
2237     $this->get('/info', '\Api\Controllers\Info:getInfo');
2238 })->add('\Api\ApiMiddleware');
2239
2240 $response = $app->run(true);
2241 // Hack to make Slim and Shaarli router work together:
2242 // If a Slim route isn't found, we call renderPage().
2243 if ($response->getStatusCode() == 404) {
2244     // We use UTF-8 for proper international characters handling.
2245     header('Content-Type: text/html; charset=utf-8');
2246     renderPage($conf, $pluginManager, $linkDb);
2247 } else {
2248     $app->respond($response);
2249 }