index.php

   1 <?php
   2 /**
   3  * Shaarli - The personal, minimalist, super-fast, database free, bookmarking service.
   4  *
   5  * Friendly fork by the Shaarli community:
   6  *  - https://github.com/shaarli/Shaarli
   7  *
   8  * Original project by sebsauvage.net:
   9  *  - http://sebsauvage.net/wiki/doku.php?id=php:shaarli
  10  *  - https://github.com/sebsauvage/Shaarli
  11  *
  12  * Licence: http://www.opensource.org/licenses/zlib-license.php
  13  *
  14  * Requires: PHP 5.5.x
  15  */
  16
  17 // Set 'UTC' as the default timezone if it is not defined in php.ini
  18 // See http://php.net/manual/en/datetime.configuration.php#ini.date.timezone
  19 if (date_default_timezone_get() == '') {
  20     date_default_timezone_set('UTC');
  21 }
  22
  23 /*
  24  * PHP configuration
  25  */
  26
  27 // http://server.com/x/shaarli --> /shaarli/
  28 define('WEB_PATH', substr($_SERVER['REQUEST_URI'], 0, 1+strrpos($_SERVER['REQUEST_URI'], '/', 0)));
  29
  30 // High execution time in case of problematic imports/exports.
  31 ini_set('max_input_time','60');
  32
  33 // Try to set max upload file size and read
  34 ini_set('memory_limit', '128M');
  35 ini_set('post_max_size', '16M');
  36 ini_set('upload_max_filesize', '16M');
  37
  38 // See all error except warnings
  39 error_reporting(E_ALL^E_WARNING);
  40 // See all errors (for debugging only)
  41 //error_reporting(-1);
  42
  43
  44 // 3rd-party libraries
  45 if (! file_exists(__DIR__ . '/vendor/autoload.php')) {
  46     header('Content-Type: text/plain; charset=utf-8');
  47     echo "Error: missing Composer configuration\n\n"
  48         ."If you installed Shaarli through Git or using the development branch,\n"
  49         ."please refer to the installation documentation to install PHP"
  50         ." dependencies using Composer:\n"
  51         ."- https://github.com/shaarli/Shaarli/wiki/Server-requirements\n"
  52         ."- https://github.com/shaarli/Shaarli/wiki/Download-and-Installation";
  53     exit;
  54 }
  55 require_once 'inc/rain.tpl.class.php';
  56 require_once __DIR__ . '/vendor/autoload.php';
  57
  58 // Shaarli library
  59 require_once 'application/ApplicationUtils.php';
  60 require_once 'application/Cache.php';
  61 require_once 'application/CachedPage.php';
  62 require_once 'application/config/ConfigPlugin.php';
  63 require_once 'application/FeedBuilder.php';
  64 require_once 'application/FileUtils.php';
  65 require_once 'application/History.php';
  66 require_once 'application/HttpUtils.php';
  67 require_once 'application/Languages.php';
  68 require_once 'application/LinkDB.php';
  69 require_once 'application/LinkFilter.php';
  70 require_once 'application/LinkUtils.php';
  71 require_once 'application/NetscapeBookmarkUtils.php';
  72 require_once 'application/PageBuilder.php';
  73 require_once 'application/TimeZone.php';
  74 require_once 'application/Url.php';
  75 require_once 'application/Utils.php';
  76 require_once 'application/PluginManager.php';
  77 require_once 'application/Router.php';
  78 require_once 'application/Updater.php';
  79 use \Shaarli\ThemeUtils;
  80 use \Shaarli\Config\ConfigManager;
  81
  82 // Ensure the PHP version is supported
  83 try {
  84     ApplicationUtils::checkPHPVersion('5.5', PHP_VERSION);
  85 } catch(Exception $exc) {
  86     header('Content-Type: text/plain; charset=utf-8');
  87     echo $exc->getMessage();
  88     exit;
  89 }
  90
  91 define('shaarli_version', ApplicationUtils::getVersion(__DIR__ .'/'. ApplicationUtils::$VERSION_FILE));
  92
  93 // Force cookie path (but do not change lifetime)
  94 $cookie = session_get_cookie_params();
  95 $cookiedir = '';
  96 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
  97     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
  98 }
  99 // Set default cookie expiration and path.
 100 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 101 // Set session parameters on server side.
 102 // If the user does not access any page within this time, his/her session is considered expired.
 103 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 104 // Use cookies to store session.
 105 ini_set('session.use_cookies', 1);
 106 // Force cookies for session (phpsessionID forbidden in URL).
 107 ini_set('session.use_only_cookies', 1);
 108 // Prevent PHP form using sessionID in URL if cookies are disabled.
 109 ini_set('session.use_trans_sid', false);
 110
 111 session_name('shaarli');
 112 // Start session if needed (Some server auto-start sessions).
 113 if (session_id() == '') {
 114     session_start();
 115 }
 116
 117 // Regenerate session ID if invalid or not defined in cookie.
 118 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 119     session_regenerate_id(true);
 120     $_COOKIE['shaarli'] = session_id();
 121 }
 122
 123 $conf = new ConfigManager();
 124 $conf->setEmpty('general.timezone', date_default_timezone_get());
 125 $conf->setEmpty('general.title', 'Shared links on '. escape(index_url($_SERVER)));
 126 RainTPL::$tpl_dir = $conf->get('resource.raintpl_tpl').'/'.$conf->get('resource.theme').'/'; // template directory
 127 RainTPL::$cache_dir = $conf->get('resource.raintpl_tmp'); // cache directory
 128
 129 $pluginManager = new PluginManager($conf);
 130 $pluginManager->load($conf->get('general.enabled_plugins'));
 131
 132 date_default_timezone_set($conf->get('general.timezone', 'UTC'));
 133
 134 ob_start();  // Output buffering for the page cache.
 135
 136 // In case stupid admin has left magic_quotes enabled in php.ini:
 137 if (get_magic_quotes_gpc())
 138 {
 139     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 140     $_POST = array_map('stripslashes_deep', $_POST);
 141     $_GET = array_map('stripslashes_deep', $_GET);
 142     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 143 }
 144
 145 // Prevent caching on client side or proxy: (yes, it's ugly)
 146 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 147 header("Cache-Control: no-store, no-cache, must-revalidate");
 148 header("Cache-Control: post-check=0, pre-check=0", false);
 149 header("Pragma: no-cache");
 150
 151 if (! is_file($conf->getConfigFileExt())) {
 152     // Ensure Shaarli has proper access to its resources
 153     $errors = ApplicationUtils::checkResourcePermissions($conf);
 154
 155     if ($errors != array()) {
 156         $message = '<p>Insufficient permissions:</p><ul>';
 157
 158         foreach ($errors as $error) {
 159             $message .= '<li>'.$error.'</li>';
 160         }
 161         $message .= '</ul>';
 162
 163         header('Content-Type: text/html; charset=utf-8');
 164         echo $message;
 165         exit;
 166     }
 167
 168     // Display the installation form if no existing config is found
 169     install($conf);
 170 }
 171
 172 // a token depending of deployment salt, user password, and the current ip
 173 define('STAY_SIGNED_IN_TOKEN', sha1($conf->get('credentials.hash') . $_SERVER['REMOTE_ADDR'] . $conf->get('credentials.salt')));
 174
 175 // Sniff browser language and set date format accordingly.
 176 if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
 177     autoLocale($_SERVER['HTTP_ACCEPT_LANGUAGE']);
 178 }
 179
 180 /**
 181  * Checking session state (i.e. is the user still logged in)
 182  *
 183  * @param ConfigManager $conf The configuration manager.
 184  *
 185  * @return bool: true if the user is logged in, false otherwise.
 186  */
 187 function setup_login_state($conf)
 188 {
 189         if ($conf->get('security.open_shaarli')) {
 190             return true;
 191         }
 192         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 193         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 194         if (! $conf->exists('credentials.login')) {
 195             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 196             $loginFailure = true;
 197         }
 198         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 199             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 200             !$loginFailure)
 201         {
 202             fillSessionInfo($conf);
 203             $userIsLoggedIn = true;
 204         }
 205         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 206         if (empty($_SESSION['uid'])
 207         || ($conf->get('security.session_protection_disabled') === false && $_SESSION['ip'] != allIPs())
 208         || time() >= $_SESSION['expires_on'])
 209         {
 210             logout();
 211             $userIsLoggedIn = false;
 212             $loginFailure = true;
 213         }
 214         if (!empty($_SESSION['longlastingsession'])) {
 215             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 216         }
 217         else {
 218             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 219         }
 220         if (!$loginFailure) {
 221             $userIsLoggedIn = true;
 222         }
 223
 224         return $userIsLoggedIn;
 225 }
 226 $userIsLoggedIn = setup_login_state($conf);
 227
 228 /**
 229  * PubSubHubbub protocol support (if enabled)  [UNTESTED]
 230  * (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 231  *
 232  * @param ConfigManager $conf Configuration Manager instance.
 233  */
 234 function pubsubhub($conf)
 235 {
 236     $pshUrl = $conf->get('config.PUBSUBHUB_URL');
 237     if (!empty($pshUrl))
 238     {
 239         include_once './publisher.php';
 240         $p = new Publisher($pshUrl);
 241         $topic_url = array (
 242             index_url($_SERVER).'?do=atom',
 243             index_url($_SERVER).'?do=rss'
 244         );
 245         $p->publish_update($topic_url);
 246     }
 247 }
 248
 249 // ------------------------------------------------------------------------------------------
 250 // Session management
 251
 252 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 253 function allIPs()
 254 {
 255     $ip = $_SERVER['REMOTE_ADDR'];
 256     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 257     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 258     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 259     return $ip;
 260 }
 261
 262 /**
 263  * Load user session.
 264  *
 265  * @param ConfigManager $conf Configuration Manager instance.
 266  */
 267 function fillSessionInfo($conf)
 268 {
 269         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 270         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 271         $_SESSION['username']= $conf->get('credentials.login');
 272         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 273 }
 274
 275 /**
 276  * Check that user/password is correct.
 277  *
 278  * @param string        $login    Username
 279  * @param string        $password User password
 280  * @param ConfigManager $conf     Configuration Manager instance.
 281  *
 282  * @return bool: authentication successful or not.
 283  */
 284 function check_auth($login, $password, $conf)
 285 {
 286     $hash = sha1($password . $login . $conf->get('credentials.salt'));
 287     if ($login == $conf->get('credentials.login') && $hash == $conf->get('credentials.hash'))
 288     {   // Login/password is correct.
 289                 fillSessionInfo($conf);
 290         logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Login successful');
 291         return true;
 292     }
 293     logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Login failed for user '.$login);
 294     return false;
 295 }
 296
 297 // Returns true if the user is logged in.
 298 function isLoggedIn()
 299 {
 300     global $userIsLoggedIn;
 301     return $userIsLoggedIn;
 302 }
 303
 304 // Force logout.
 305 function logout() {
 306     if (isset($_SESSION)) {
 307         unset($_SESSION['uid']);
 308         unset($_SESSION['ip']);
 309         unset($_SESSION['username']);
 310         unset($_SESSION['privateonly']);
 311     }
 312     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 313 }
 314
 315
 316 // ------------------------------------------------------------------------------------------
 317 // Brute force protection system
 318 // Several consecutive failed logins will ban the IP address for 30 minutes.
 319 if (!is_file($conf->get('resource.ban_file', 'data/ipbans.php'))) {
 320     // FIXME! globals
 321     file_put_contents(
 322         $conf->get('resource.ban_file', 'data/ipbans.php'),
 323         "<?php\n\$GLOBALS['IPBANS']=".var_export(array('FAILURES'=>array(),'BANS'=>array()),true).";\n?>"
 324     );
 325 }
 326 include $conf->get('resource.ban_file', 'data/ipbans.php');
 327 /**
 328  * Signal a failed login. Will ban the IP if too many failures:
 329  *
 330  * @param ConfigManager $conf Configuration Manager instance.
 331  */
 332 function ban_loginFailed($conf)
 333 {
 334     $ip = $_SERVER['REMOTE_ADDR'];
 335     $trusted = $conf->get('security.trusted_proxies', array());
 336     if (in_array($ip, $trusted)) {
 337         $ip = getIpAddressFromProxy($_SERVER, $trusted);
 338         if (!$ip) {
 339             return;
 340         }
 341     }
 342     $gb = $GLOBALS['IPBANS'];
 343     if (! isset($gb['FAILURES'][$ip])) {
 344         $gb['FAILURES'][$ip]=0;
 345     }
 346     $gb['FAILURES'][$ip]++;
 347     if ($gb['FAILURES'][$ip] > ($conf->get('security.ban_after') - 1))
 348     {
 349         $gb['BANS'][$ip] = time() + $conf->get('security.ban_after', 1800);
 350         logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'IP address banned from login');
 351     }
 352     $GLOBALS['IPBANS'] = $gb;
 353     file_put_contents(
 354         $conf->get('resource.ban_file', 'data/ipbans.php'),
 355         "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 356     );
 357 }
 358
 359 /**
 360  * Signals a successful login. Resets failed login counter.
 361  *
 362  * @param ConfigManager $conf Configuration Manager instance.
 363  */
 364 function ban_loginOk($conf)
 365 {
 366     $ip = $_SERVER['REMOTE_ADDR'];
 367     $gb = $GLOBALS['IPBANS'];
 368     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 369     $GLOBALS['IPBANS'] = $gb;
 370     file_put_contents(
 371         $conf->get('resource.ban_file', 'data/ipbans.php'),
 372         "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 373     );
 374 }
 375
 376 /**
 377  * Checks if the user CAN login. If 'true', the user can try to login.
 378  *
 379  * @param ConfigManager $conf Configuration Manager instance.
 380  *
 381  * @return bool: true if the user is allowed to login.
 382  */
 383 function ban_canLogin($conf)
 384 {
 385     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 386     if (isset($gb['BANS'][$ip]))
 387     {
 388         // User is banned. Check if the ban has expired:
 389         if ($gb['BANS'][$ip]<=time())
 390         {   // Ban expired, user can try to login again.
 391             logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Ban lifted.');
 392             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 393             file_put_contents(
 394                 $conf->get('resource.ban_file', 'data/ipbans.php'),
 395                 "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 396             );
 397             return true; // Ban has expired, user can login.
 398         }
 399         return false; // User is banned.
 400     }
 401     return true; // User is not banned.
 402 }
 403
 404 // ------------------------------------------------------------------------------------------
 405 // Process login form: Check if login/password is correct.
 406 if (isset($_POST['login']))
 407 {
 408     if (!ban_canLogin($conf)) die('I said: NO. You are banned for the moment. Go away.');
 409     if (isset($_POST['password'])
 410         && tokenOk($_POST['token'])
 411         && (check_auth($_POST['login'], $_POST['password'], $conf))
 412     ) {   // Login/password is OK.
 413         ban_loginOk($conf);
 414         // If user wants to keep the session cookie even after the browser closes:
 415         if (!empty($_POST['longlastingsession']))
 416         {
 417                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 418             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 419             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 420
 421             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 422             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 423             // Note: Never forget the trailing slash on the cookie path!
 424             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 425         }
 426         else // Standard session expiration (=when browser closes)
 427         {
 428             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 429             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 430             session_regenerate_id(true);
 431         }
 432
 433         // Optional redirect after login:
 434         if (isset($_GET['post'])) {
 435             $uri = '?post='. urlencode($_GET['post']);
 436             foreach (array('description', 'source', 'title', 'tags') as $param) {
 437                 if (!empty($_GET[$param])) {
 438                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 439                 }
 440             }
 441             header('Location: '. $uri);
 442             exit;
 443         }
 444
 445         if (isset($_GET['edit_link'])) {
 446             header('Location: ?edit_link='. escape($_GET['edit_link']));
 447             exit;
 448         }
 449
 450         if (isset($_POST['returnurl'])) {
 451             // Prevent loops over login screen.
 452             if (strpos($_POST['returnurl'], 'do=login') === false) {
 453                 header('Location: '. generateLocation($_POST['returnurl'], $_SERVER['HTTP_HOST']));
 454                 exit;
 455             }
 456         }
 457         header('Location: ?'); exit;
 458     }
 459     else
 460     {
 461         ban_loginFailed($conf);
 462         $redir = '&username='. $_POST['login'];
 463         if (isset($_GET['post'])) {
 464             $redir .= '&post=' . urlencode($_GET['post']);
 465             foreach (array('description', 'source', 'title', 'tags') as $param) {
 466                 if (!empty($_GET[$param])) {
 467                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 468                 }
 469             }
 470         }
 471         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 472         exit;
 473     }
 474 }
 475
 476 // ------------------------------------------------------------------------------------------
 477 // Token management for XSRF protection
 478 // Token should be used in any form which acts on data (create,update,delete,import...).
 479 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 480
 481 /**
 482  * Returns a token.
 483  *
 484  * @param ConfigManager $conf Configuration Manager instance.
 485  *
 486  * @return string token.
 487  */
 488 function getToken($conf)
 489 {
 490     $rnd = sha1(uniqid('', true) .'_'. mt_rand() . $conf->get('credentials.salt'));  // We generate a random string.
 491     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 492     return $rnd;
 493 }
 494
 495 // Tells if a token is OK. Using this function will destroy the token.
 496 // true=token is OK.
 497 function tokenOk($token)
 498 {
 499     if (isset($_SESSION['tokens'][$token]))
 500     {
 501         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 502         return true; // Token is OK.
 503     }
 504     return false; // Wrong token, or already used.
 505 }
 506
 507 /**
 508  * Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 509  * Gives the last 7 days (which have links).
 510  * This RSS feed cannot be filtered.
 511  *
 512  * @param ConfigManager $conf Configuration Manager instance.
 513  */
 514 function showDailyRSS($conf) {
 515     // Cache system
 516     $query = $_SERVER['QUERY_STRING'];
 517     $cache = new CachedPage(
 518         $conf->get('config.PAGE_CACHE'),
 519         page_url($_SERVER),
 520         startsWith($query,'do=dailyrss') && !isLoggedIn()
 521     );
 522     $cached = $cache->cachedVersion();
 523     if (!empty($cached)) {
 524         echo $cached;
 525         exit;
 526     }
 527
 528     // If cached was not found (or not usable), then read the database and build the response:
 529     // Read links from database (and filter private links if used it not logged in).
 530     $LINKSDB = new LinkDB(
 531         $conf->get('resource.datastore'),
 532         isLoggedIn(),
 533         $conf->get('privacy.hide_public_links'),
 534         $conf->get('redirector.url'),
 535         $conf->get('redirector.encode_url')
 536     );
 537
 538     /* Some Shaarlies may have very few links, so we need to look
 539        back in time until we have enough days ($nb_of_days).
 540     */
 541     $nb_of_days = 7; // We take 7 days.
 542     $today = date('Ymd');
 543     $days = array();
 544
 545     foreach ($LINKSDB as $link) {
 546         $day = $link['created']->format('Ymd'); // Extract day (without time)
 547         if (strcmp($day, $today) < 0) {
 548             if (empty($days[$day])) {
 549                 $days[$day] = array();
 550             }
 551             $days[$day][] = $link;
 552         }
 553
 554         if (count($days) > $nb_of_days) {
 555             break; // Have we collected enough days?
 556         }
 557     }
 558
 559     // Build the RSS feed.
 560     header('Content-Type: application/rss+xml; charset=utf-8');
 561     $pageaddr = escape(index_url($_SERVER));
 562     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 563     echo '<channel>';
 564     echo '<title>Daily - '. $conf->get('general.title') . '</title>';
 565     echo '<link>'. $pageaddr .'</link>';
 566     echo '<description>Daily shared links</description>';
 567     echo '<language>en-en</language>';
 568     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 569
 570     // For each day.
 571     foreach ($days as $day => $links) {
 572         $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 573         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 574
 575         // We pre-format some fields for proper output.
 576         foreach ($links as &$link) {
 577             $link['formatedDescription'] = format_description($link['description'], $conf->get('redirector.url'));
 578             $link['thumbnail'] = thumbnail($conf, $link['url']);
 579             $link['timestamp'] = $link['created']->getTimestamp();
 580             if (startsWith($link['url'], '?')) {
 581                 $link['url'] = index_url($_SERVER) . $link['url'];  // make permalink URL absolute
 582             }
 583         }
 584
 585         // Then build the HTML for this day:
 586         $tpl = new RainTPL;
 587         $tpl->assign('title', $conf->get('general.title'));
 588         $tpl->assign('daydate', $dayDate->getTimestamp());
 589         $tpl->assign('absurl', $absurl);
 590         $tpl->assign('links', $links);
 591         $tpl->assign('rssdate', escape($dayDate->format(DateTime::RSS)));
 592         $tpl->assign('hide_timestamps', $conf->get('privacy.hide_timestamps', false));
 593         $html = $tpl->draw('dailyrss', true);
 594
 595         echo $html . PHP_EOL;
 596     }
 597     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
 598
 599     $cache->cache(ob_get_contents());
 600     ob_end_flush();
 601     exit;
 602 }
 603
 604 /**
 605  * Show the 'Daily' page.
 606  *
 607  * @param PageBuilder   $pageBuilder   Template engine wrapper.
 608  * @param LinkDB        $LINKSDB       LinkDB instance.
 609  * @param ConfigManager $conf          Configuration Manager instance.
 610  * @param PluginManager $pluginManager Plugin Manager instane.
 611  */
 612 function showDaily($pageBuilder, $LINKSDB, $conf, $pluginManager)
 613 {
 614     $day=date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 615     if (isset($_GET['day'])) $day=$_GET['day'];
 616
 617     $days = $LINKSDB->days();
 618     $i = array_search($day,$days);
 619     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
 620     $previousday='';
 621     $nextday='';
 622     if ($i!==false)
 623     {
 624         if ($i>=1) $previousday=$days[$i-1];
 625         if ($i<count($days)-1) $nextday=$days[$i+1];
 626     }
 627
 628     try {
 629         $linksToDisplay = $LINKSDB->filterDay($day);
 630     } catch (Exception $exc) {
 631         error_log($exc);
 632         $linksToDisplay = array();
 633     }
 634
 635     // We pre-format some fields for proper output.
 636     foreach($linksToDisplay as $key=>$link)
 637     {
 638
 639         $taglist = explode(' ',$link['tags']);
 640         uasort($taglist, 'strcasecmp');
 641         $linksToDisplay[$key]['taglist']=$taglist;
 642         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $conf->get('redirector.url'));
 643         $linksToDisplay[$key]['thumbnail'] = thumbnail($conf, $link['url']);
 644         $linksToDisplay[$key]['timestamp'] =  $link['created']->getTimestamp();
 645     }
 646
 647     /* We need to spread the articles on 3 columns.
 648        I did not want to use a JavaScript lib like http://masonry.desandro.com/
 649        so I manually spread entries with a simple method: I roughly evaluate the
 650        height of a div according to title and description length.
 651     */
 652     $columns=array(array(),array(),array()); // Entries to display, for each column.
 653     $fill=array(0,0,0);  // Rough estimate of columns fill.
 654     foreach($linksToDisplay as $key=>$link)
 655     {
 656         // Roughly estimate length of entry (by counting characters)
 657         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
 658         // Description: 836 characters gives roughly 342 pixel height.
 659         // This is not perfect, but it's usually OK.
 660         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
 661         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
 662         // Then put in column which is the less filled:
 663         $smallest=min($fill); // find smallest value in array.
 664         $index=array_search($smallest,$fill); // find index of this smallest value.
 665         array_push($columns[$index],$link); // Put entry in this column.
 666         $fill[$index]+=$length;
 667     }
 668
 669     $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 670     $data = array(
 671         'pagetitle' => $conf->get('general.title') .' - '. format_date($dayDate, false),
 672         'linksToDisplay' => $linksToDisplay,
 673         'cols' => $columns,
 674         'day' => $dayDate->getTimestamp(),
 675         'dayDate' => $dayDate,
 676         'previousday' => $previousday,
 677         'nextday' => $nextday,
 678     );
 679
 680     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
 681
 682     foreach ($data as $key => $value) {
 683         $pageBuilder->assign($key, $value);
 684     }
 685
 686     $pageBuilder->renderPage('daily');
 687     exit;
 688 }
 689
 690 /**
 691  * Renders the linklist
 692  *
 693  * @param pageBuilder   $PAGE    pageBuilder instance.
 694  * @param LinkDB        $LINKSDB LinkDB instance.
 695  * @param ConfigManager $conf    Configuration Manager instance.
 696  * @param PluginManager $pluginManager Plugin Manager instance.
 697  */
 698 function showLinkList($PAGE, $LINKSDB, $conf, $pluginManager) {
 699     buildLinkList($PAGE,$LINKSDB, $conf, $pluginManager); // Compute list of links to display
 700     $PAGE->renderPage('linklist');
 701 }
 702
 703 /**
 704  * Render HTML page (according to URL parameters and user rights)
 705  *
 706  * @param ConfigManager $conf          Configuration Manager instance.
 707  * @param PluginManager $pluginManager Plugin Manager instance,
 708  * @param LinkDB        $LINKSDB
 709  */
 710 function renderPage($conf, $pluginManager, $LINKSDB)
 711 {
 712     $updater = new Updater(
 713         read_updates_file($conf->get('resource.updates')),
 714         $LINKSDB,
 715         $conf,
 716         isLoggedIn()
 717     );
 718     try {
 719         $newUpdates = $updater->update();
 720         if (! empty($newUpdates)) {
 721             write_updates_file(
 722                 $conf->get('resource.updates'),
 723                 $updater->getDoneUpdates()
 724             );
 725         }
 726     }
 727     catch(Exception $e) {
 728         die($e->getMessage());
 729     }
 730
 731     try {
 732         $history = new History($conf->get('resource.history'));
 733     } catch(Exception $e) {
 734         die($e->getMessage());
 735     }
 736
 737     $PAGE = new PageBuilder($conf);
 738     $PAGE->assign('linkcount', count($LINKSDB));
 739     $PAGE->assign('privateLinkcount', count_private($LINKSDB));
 740     $PAGE->assign('plugin_errors', $pluginManager->getErrors());
 741
 742     // Determine which page will be rendered.
 743     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
 744     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
 745
 746     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
 747     // Then assign generated data to RainTPL.
 748     $common_hooks = array(
 749         'includes',
 750         'header',
 751         'footer',
 752     );
 753
 754     foreach($common_hooks as $name) {
 755         $plugin_data = array();
 756         $pluginManager->executeHooks('render_' . $name, $plugin_data,
 757             array(
 758                 'target' => $targetPage,
 759                 'loggedin' => isLoggedIn()
 760             )
 761         );
 762         $PAGE->assign('plugins_' . $name, $plugin_data);
 763     }
 764
 765     // -------- Display login form.
 766     if ($targetPage == Router::$PAGE_LOGIN)
 767     {
 768         if ($conf->get('security.open_shaarli')) { header('Location: ?'); exit; }  // No need to login for open Shaarli
 769         if (isset($_GET['username'])) {
 770             $PAGE->assign('username', escape($_GET['username']));
 771         }
 772         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
 773         $PAGE->renderPage('loginform');
 774         exit;
 775     }
 776     // -------- User wants to logout.
 777     if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=logout'))
 778     {
 779         invalidateCaches($conf->get('resource.page_cache'));
 780         logout();
 781         header('Location: ?');
 782         exit;
 783     }
 784
 785     // -------- Picture wall
 786     if ($targetPage == Router::$PAGE_PICWALL)
 787     {
 788         // Optionally filter the results:
 789         $links = $LINKSDB->filterSearch($_GET);
 790         $linksToDisplay = array();
 791
 792         // Get only links which have a thumbnail.
 793         foreach($links as $link)
 794         {
 795             $permalink='?'.$link['shorturl'];
 796             $thumb=lazyThumbnail($conf, $link['url'],$permalink);
 797             if ($thumb!='') // Only output links which have a thumbnail.
 798             {
 799                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
 800                 $linksToDisplay[]=$link; // Add to array.
 801             }
 802         }
 803
 804         $data = array(
 805             'linksToDisplay' => $linksToDisplay,
 806         );
 807         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
 808
 809         foreach ($data as $key => $value) {
 810             $PAGE->assign($key, $value);
 811         }
 812
 813         $PAGE->renderPage('picwall');
 814         exit;
 815     }
 816
 817     // -------- Tag cloud
 818     if ($targetPage == Router::$PAGE_TAGCLOUD)
 819     {
 820         $tags= $LINKSDB->allTags();
 821
 822         // We sort tags alphabetically, then choose a font size according to count.
 823         // First, find max value.
 824         $maxcount = 0;
 825         foreach ($tags as $value) {
 826             $maxcount = max($maxcount, $value);
 827         }
 828
 829         // Sort tags alphabetically: case insensitive, support locale if available.
 830         uksort($tags, function($a, $b) {
 831             // Collator is part of PHP intl.
 832             if (class_exists('Collator')) {
 833                 $c = new Collator(setlocale(LC_COLLATE, 0));
 834                 if (!intl_is_failure(intl_get_error_code())) {
 835                     return $c->compare($a, $b);
 836                 }
 837             }
 838             return strcasecmp($a, $b);
 839         });
 840
 841         $tagList = array();
 842         foreach($tags as $key => $value) {
 843             // Tag font size scaling:
 844             //   default 15 and 30 logarithm bases affect scaling,
 845             //   22 and 6 are arbitrary font sizes for max and min sizes.
 846             $size = log($value, 15) / log($maxcount, 30) * 2.2 + 0.8;
 847             $tagList[$key] = array(
 848                 'count' => $value,
 849                 'size' => number_format($size, 2, '.', ''),
 850             );
 851         }
 852
 853         $data = array(
 854             'tags' => $tagList,
 855         );
 856         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
 857
 858         foreach ($data as $key => $value) {
 859             $PAGE->assign($key, $value);
 860         }
 861
 862         $PAGE->renderPage('tagcloud');
 863         exit;
 864     }
 865
 866     // Daily page.
 867     if ($targetPage == Router::$PAGE_DAILY) {
 868         showDaily($PAGE, $LINKSDB, $conf, $pluginManager);
 869     }
 870
 871     // ATOM and RSS feed.
 872     if ($targetPage == Router::$PAGE_FEED_ATOM || $targetPage == Router::$PAGE_FEED_RSS) {
 873         $feedType = $targetPage == Router::$PAGE_FEED_RSS ? FeedBuilder::$FEED_RSS : FeedBuilder::$FEED_ATOM;
 874         header('Content-Type: application/'. $feedType .'+xml; charset=utf-8');
 875
 876         // Cache system
 877         $query = $_SERVER['QUERY_STRING'];
 878         $cache = new CachedPage(
 879             $conf->get('resource.page_cache'),
 880             page_url($_SERVER),
 881             startsWith($query,'do='. $targetPage) && !isLoggedIn()
 882         );
 883         $cached = $cache->cachedVersion();
 884         if (!empty($cached)) {
 885             echo $cached;
 886             exit;
 887         }
 888
 889         // Generate data.
 890         $feedGenerator = new FeedBuilder($LINKSDB, $feedType, $_SERVER, $_GET, isLoggedIn());
 891         $feedGenerator->setLocale(strtolower(setlocale(LC_COLLATE, 0)));
 892         $feedGenerator->setHideDates($conf->get('privacy.hide_timestamps') && !isLoggedIn());
 893         $feedGenerator->setUsePermalinks(isset($_GET['permalinks']) || !$conf->get('feed.rss_permalinks'));
 894         $data = $feedGenerator->buildData();
 895
 896         // Process plugin hook.
 897         $pluginManager->executeHooks('render_feed', $data, array(
 898             'loggedin' => isLoggedIn(),
 899             'target' => $targetPage,
 900         ));
 901
 902         // Render the template.
 903         $PAGE->assignAll($data);
 904         $PAGE->renderPage('feed.'. $feedType);
 905         $cache->cache(ob_get_contents());
 906         ob_end_flush();
 907         exit;
 908     }
 909
 910     // Display opensearch plugin (XML)
 911     if ($targetPage == Router::$PAGE_OPENSEARCH) {
 912         header('Content-Type: application/xml; charset=utf-8');
 913         $PAGE->assign('serverurl', index_url($_SERVER));
 914         $PAGE->renderPage('opensearch');
 915         exit;
 916     }
 917
 918     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
 919     if (isset($_GET['addtag']))
 920     {
 921         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
 922         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
 923         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
 924
 925         // Prevent redirection loop
 926         if (isset($params['addtag'])) {
 927             unset($params['addtag']);
 928         }
 929
 930         // Check if this tag is already in the search query and ignore it if it is.
 931         // Each tag is always separated by a space
 932         if (isset($params['searchtags'])) {
 933             $current_tags = explode(' ', $params['searchtags']);
 934         } else {
 935             $current_tags = array();
 936         }
 937         $addtag = true;
 938         foreach ($current_tags as $value) {
 939             if ($value === $_GET['addtag']) {
 940                 $addtag = false;
 941                 break;
 942             }
 943         }
 944         // Append the tag if necessary
 945         if (empty($params['searchtags'])) {
 946             $params['searchtags'] = trim($_GET['addtag']);
 947         }
 948         else if ($addtag) {
 949             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
 950         }
 951
 952         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
 953         header('Location: ?'.http_build_query($params));
 954         exit;
 955     }
 956
 957     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
 958     if (isset($_GET['removetag'])) {
 959         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
 960         if (empty($_SERVER['HTTP_REFERER'])) {
 961             header('Location: ?');
 962             exit;
 963         }
 964
 965         // In case browser does not send HTTP_REFERER
 966         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
 967
 968         // Prevent redirection loop
 969         if (isset($params['removetag'])) {
 970             unset($params['removetag']);
 971         }
 972
 973         if (isset($params['searchtags'])) {
 974             $tags = explode(' ', $params['searchtags']);
 975             // Remove value from array $tags.
 976             $tags = array_diff($tags, array($_GET['removetag']));
 977             $params['searchtags'] = implode(' ',$tags);
 978
 979             if (empty($params['searchtags'])) {
 980                 unset($params['searchtags']);
 981             }
 982
 983             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
 984         }
 985         header('Location: ?'.http_build_query($params));
 986         exit;
 987     }
 988
 989     // -------- User wants to change the number of links per page (linksperpage=...)
 990     if (isset($_GET['linksperpage'])) {
 991         if (is_numeric($_GET['linksperpage'])) {
 992             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
 993         }
 994
 995         if (! empty($_SERVER['HTTP_REFERER'])) {
 996             $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage'));
 997         } else {
 998             $location = '?';
 999         }
1000         header('Location: '. $location);
1001         exit;
1002     }
1003
1004     // -------- User wants to see only private links (toggle)
1005     if (isset($_GET['privateonly'])) {
1006         if (empty($_SESSION['privateonly'])) {
1007             $_SESSION['privateonly'] = 1; // See only private links
1008         } else {
1009             unset($_SESSION['privateonly']); // See all links
1010         }
1011
1012         if (! empty($_SERVER['HTTP_REFERER'])) {
1013             $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly'));
1014         } else {
1015             $location = '?';
1016         }
1017         header('Location: '. $location);
1018         exit;
1019     }
1020
1021     // -------- Handle other actions allowed for non-logged in users:
1022     if (!isLoggedIn())
1023     {
1024         // User tries to post new link but is not logged in:
1025         // Show login screen, then redirect to ?post=...
1026         if (isset($_GET['post']))
1027         {
1028             header( // Redirect to login page, then back to post link.
1029                 'Location: ?do=login&post='.urlencode($_GET['post']).
1030                 (!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').
1031                 (!empty($_GET['description'])?'&description='.urlencode($_GET['description']):'').
1032                 (!empty($_GET['tags'])?'&tags='.urlencode($_GET['tags']):'').
1033                 (!empty($_GET['source'])?'&source='.urlencode($_GET['source']):'')
1034             );
1035             exit;
1036         }
1037
1038         showLinkList($PAGE, $LINKSDB, $conf, $pluginManager);
1039         if (isset($_GET['edit_link'])) {
1040             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1041             exit;
1042         }
1043
1044         exit; // Never remove this one! All operations below are reserved for logged in user.
1045     }
1046
1047     // -------- All other functions are reserved for the registered user:
1048
1049     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1050     if ($targetPage == Router::$PAGE_TOOLS)
1051     {
1052         $data = array(
1053             'pageabsaddr' => index_url($_SERVER),
1054             'sslenabled' => !empty($_SERVER['HTTPS'])
1055         );
1056         $pluginManager->executeHooks('render_tools', $data);
1057
1058         foreach ($data as $key => $value) {
1059             $PAGE->assign($key, $value);
1060         }
1061
1062         $PAGE->renderPage('tools');
1063         exit;
1064     }
1065
1066     // -------- User wants to change his/her password.
1067     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1068     {
1069         if ($conf->get('security.open_shaarli')) {
1070             die('You are not supposed to change a password on an Open Shaarli.');
1071         }
1072
1073         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1074         {
1075             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1076
1077             // Make sure old password is correct.
1078             $oldhash = sha1($_POST['oldpassword'].$conf->get('credentials.login').$conf->get('credentials.salt'));
1079             if ($oldhash!= $conf->get('credentials.hash')) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1080             // Save new password
1081             // Salt renders rainbow-tables attacks useless.
1082             $conf->set('credentials.salt', sha1(uniqid('', true) .'_'. mt_rand()));
1083             $conf->set('credentials.hash', sha1($_POST['setpassword'] . $conf->get('credentials.login') . $conf->get('credentials.salt')));
1084             try {
1085                 $conf->write(isLoggedIn());
1086             }
1087             catch(Exception $e) {
1088                 error_log(
1089                     'ERROR while writing config file after changing password.' . PHP_EOL .
1090                     $e->getMessage()
1091                 );
1092
1093                 // TODO: do not handle exceptions/errors in JS.
1094                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1095                 exit;
1096             }
1097             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1098             exit;
1099         }
1100         else // show the change password form.
1101         {
1102             $PAGE->renderPage('changepassword');
1103             exit;
1104         }
1105     }
1106
1107     // -------- User wants to change configuration
1108     if ($targetPage == Router::$PAGE_CONFIGURE)
1109     {
1110         if (!empty($_POST['title']) )
1111         {
1112             if (!tokenOk($_POST['token'])) {
1113                 die('Wrong token.'); // Go away!
1114             }
1115             $tz = 'UTC';
1116             if (!empty($_POST['continent']) && !empty($_POST['city'])
1117                 && isTimeZoneValid($_POST['continent'], $_POST['city'])
1118             ) {
1119                 $tz = $_POST['continent'] . '/' . $_POST['city'];
1120             }
1121             $conf->set('general.timezone', $tz);
1122             $conf->set('general.title', escape($_POST['title']));
1123             $conf->set('general.header_link', escape($_POST['titleLink']));
1124             $conf->set('resource.theme', escape($_POST['theme']));
1125             $conf->set('redirector.url', escape($_POST['redirector']));
1126             $conf->set('security.session_protection_disabled', !empty($_POST['disablesessionprotection']));
1127             $conf->set('privacy.default_private_links', !empty($_POST['privateLinkByDefault']));
1128             $conf->set('feed.rss_permalinks', !empty($_POST['enableRssPermalinks']));
1129             $conf->set('updates.check_updates', !empty($_POST['updateCheck']));
1130             $conf->set('privacy.hide_public_links', !empty($_POST['hidePublicLinks']));
1131             $conf->set('api.enabled', !empty($_POST['enableApi']));
1132             $conf->set('api.secret', escape($_POST['apiSecret']));
1133             try {
1134                 $conf->write(isLoggedIn());
1135                 $history->updateSettings();
1136                 invalidateCaches($conf->get('resource.page_cache'));
1137             }
1138             catch(Exception $e) {
1139                 error_log(
1140                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1141                     $e->getMessage()
1142                 );
1143
1144                 // TODO: do not handle exceptions/errors in JS.
1145                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=configure\';</script>';
1146                 exit;
1147             }
1148             echo '<script>alert("Configuration was saved.");document.location=\'?do=configure\';</script>';
1149             exit;
1150         }
1151         else // Show the configuration form.
1152         {
1153             $PAGE->assign('title', $conf->get('general.title'));
1154             $PAGE->assign('theme', $conf->get('resource.theme'));
1155             $PAGE->assign('theme_available', ThemeUtils::getThemes($conf->get('resource.raintpl_tpl')));
1156             $PAGE->assign('redirector', $conf->get('redirector.url'));
1157             list($continents, $cities) = generateTimeZoneData(
1158                 timezone_identifiers_list(),
1159                 $conf->get('general.timezone')
1160             );
1161             $PAGE->assign('continents', $continents);
1162             $PAGE->assign('cities', $cities);
1163             $PAGE->assign('private_links_default', $conf->get('privacy.default_private_links', false));
1164             $PAGE->assign('session_protection_disabled', $conf->get('security.session_protection_disabled', false));
1165             $PAGE->assign('enable_rss_permalinks', $conf->get('feed.rss_permalinks', false));
1166             $PAGE->assign('enable_update_check', $conf->get('updates.check_updates', true));
1167             $PAGE->assign('hide_public_links', $conf->get('privacy.hide_public_links', false));
1168             $PAGE->assign('api_enabled', $conf->get('api.enabled', true));
1169             $PAGE->assign('api_secret', $conf->get('api.secret'));
1170             $history->updateSettings();
1171             $PAGE->renderPage('configure');
1172             exit;
1173         }
1174     }
1175
1176     // -------- User wants to rename a tag or delete it
1177     if ($targetPage == Router::$PAGE_CHANGETAG)
1178     {
1179         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1180             $PAGE->assign('tags', $LINKSDB->allTags());
1181             $PAGE->renderPage('changetag');
1182             exit;
1183         }
1184
1185         if (!tokenOk($_POST['token'])) {
1186             die('Wrong token.');
1187         }
1188
1189         // Delete a tag:
1190         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1191             $needle = trim($_POST['fromtag']);
1192             // True for case-sensitive tag search.
1193             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1194             foreach($linksToAlter as $key=>$value)
1195             {
1196                 $tags = explode(' ',trim($value['tags']));
1197                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1198                 $value['tags']=trim(implode(' ',$tags));
1199                 $LINKSDB[$key]=$value;
1200                 $history->updateLink($LINKSDB[$key]);
1201             }
1202             $LINKSDB->save($conf->get('resource.page_cache'));
1203             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?do=changetag\';</script>';
1204             exit;
1205         }
1206
1207         // Rename a tag:
1208         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1209             $needle = trim($_POST['fromtag']);
1210             // True for case-sensitive tag search.
1211             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1212             foreach($linksToAlter as $key=>$value) {
1213                 $tags = preg_split('/\s+/', trim($value['tags']));
1214                 // Replace tags value.
1215                 $tags[array_search($needle, $tags)] = trim($_POST['totag']);
1216                 $value['tags'] = implode(' ', array_unique($tags));
1217                 $LINKSDB[$key] = $value;
1218                 $history->updateLink($LINKSDB[$key]);
1219             }
1220             $LINKSDB->save($conf->get('resource.page_cache')); // Save to disk.
1221             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode(escape($_POST['totag'])).'\';</script>';
1222             exit;
1223         }
1224     }
1225
1226     // -------- User wants to add a link without using the bookmarklet: Show form.
1227     if ($targetPage == Router::$PAGE_ADDLINK)
1228     {
1229         $PAGE->renderPage('addlink');
1230         exit;
1231     }
1232
1233     // -------- User clicked the "Save" button when editing a link: Save link to database.
1234     if (isset($_POST['save_edit']))
1235     {
1236         // Go away!
1237         if (! tokenOk($_POST['token'])) {
1238             die('Wrong token.');
1239         }
1240
1241         // lf_id should only be present if the link exists.
1242         $id = isset($_POST['lf_id']) ? intval(escape($_POST['lf_id'])) : $LINKSDB->getNextId();
1243         // Linkdate is kept here to:
1244         //   - use the same permalink for notes as they're displayed when creating them
1245         //   - let users hack creation date of their posts
1246         //     See: https://github.com/shaarli/Shaarli/wiki/Datastore-hacks#changing-the-timestamp-for-a-link
1247         $linkdate = escape($_POST['lf_linkdate']);
1248         if (isset($LINKSDB[$id])) {
1249             // Edit
1250             $created = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $linkdate);
1251             $updated = new DateTime();
1252             $shortUrl = $LINKSDB[$id]['shorturl'];
1253             $new = false;
1254         } else {
1255             // New link
1256             $created = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $linkdate);
1257             $updated = null;
1258             $shortUrl = link_small_hash($created, $id);
1259             $new = true;
1260         }
1261
1262         // Remove multiple spaces.
1263         $tags = trim(preg_replace('/\s\s+/', ' ', $_POST['lf_tags']));
1264         // Remove first '-' char in tags.
1265         $tags = preg_replace('/(^| )\-/', '$1', $tags);
1266         // Remove duplicates.
1267         $tags = implode(' ', array_unique(explode(' ', $tags)));
1268
1269         $url = trim($_POST['lf_url']);
1270         if (! startsWith($url, 'http:') && ! startsWith($url, 'https:')
1271             && ! startsWith($url, 'ftp:') && ! startsWith($url, 'magnet:')
1272             && ! startsWith($url, '?') && ! startsWith($url, 'javascript:')
1273         ) {
1274             $url = 'http://' . $url;
1275         }
1276
1277         $link = array(
1278             'id' => $id,
1279             'title' => trim($_POST['lf_title']),
1280             'url' => $url,
1281             'description' => $_POST['lf_description'],
1282             'private' => (isset($_POST['lf_private']) ? 1 : 0),
1283             'created' => $created,
1284             'updated' => $updated,
1285             'tags' => str_replace(',', ' ', $tags),
1286             'shorturl' => $shortUrl,
1287         );
1288
1289         // If title is empty, use the URL as title.
1290         if ($link['title'] == '') {
1291             $link['title'] = $link['url'];
1292         }
1293
1294         $pluginManager->executeHooks('save_link', $link);
1295
1296         $LINKSDB[$id] = $link;
1297         $LINKSDB->save($conf->get('resource.page_cache'));
1298         if ($new) {
1299             $history->addLink($link);
1300         } else {
1301             $history->updateLink($link);
1302         }
1303
1304         // If we are called from the bookmarklet, we must close the popup:
1305         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1306             echo '<script>self.close();</script>';
1307             exit;
1308         }
1309
1310         $returnurl = !empty($_POST['returnurl']) ? $_POST['returnurl'] : '?';
1311         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1312         // Scroll to the link which has been edited.
1313         $location .= '#' . $link['shorturl'];
1314         // After saving the link, redirect to the page the user was on.
1315         header('Location: '. $location);
1316         exit;
1317     }
1318
1319     // -------- User clicked the "Cancel" button when editing a link.
1320     if (isset($_POST['cancel_edit']))
1321     {
1322         $id = isset($_POST['lf_id']) ? (int) escape($_POST['lf_id']) : false;
1323         if (! isset($LINKSDB[$id])) {
1324             header('Location: ?');
1325         }
1326         // If we are called from the bookmarklet, we must close the popup:
1327         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1328         $link = $LINKSDB[$id];
1329         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1330         // Scroll to the link which has been edited.
1331         $returnurl .= '#'. $link['shorturl'];
1332         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1333         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1334         exit;
1335     }
1336
1337     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1338     if ($targetPage == Router::$PAGE_DELETELINK)
1339     {
1340         // We do not need to ask for confirmation:
1341         // - confirmation is handled by JavaScript
1342         // - we are protected from XSRF by the token.
1343
1344         if (! tokenOk($_GET['token'])) {
1345             die('Wrong token.');
1346         }
1347
1348         $id = intval(escape($_GET['lf_linkdate']));
1349         $link = $LINKSDB[$id];
1350         $pluginManager->executeHooks('delete_link', $link);
1351         unset($LINKSDB[$id]);
1352         $LINKSDB->save($conf->get('resource.page_cache')); // save to disk
1353         $history->deleteLink($link);
1354
1355         // If we are called from the bookmarklet, we must close the popup:
1356         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1357
1358         $location = '?';
1359         if (isset($_SERVER['HTTP_REFERER'])) {
1360             // Don't redirect to where we were previously if it was a permalink or an edit_link, because it would 404.
1361             $location = generateLocation(
1362                     $_SERVER['HTTP_REFERER'],
1363                     $_SERVER['HTTP_HOST'],
1364                     ['delete_link', 'edit_link', $link['shorturl']]
1365             );
1366         }
1367
1368         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1369         exit;
1370     }
1371
1372     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1373     if (isset($_GET['edit_link']))
1374     {
1375         $id = (int) escape($_GET['edit_link']);
1376         $link = $LINKSDB[$id];  // Read database
1377         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1378         $link['linkdate'] = $link['created']->format(LinkDB::LINK_DATE_FORMAT);
1379         $data = array(
1380             'link' => $link,
1381             'link_is_new' => false,
1382             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1383             'tags' => $LINKSDB->allTags(),
1384         );
1385         $pluginManager->executeHooks('render_editlink', $data);
1386
1387         foreach ($data as $key => $value) {
1388             $PAGE->assign($key, $value);
1389         }
1390
1391         $PAGE->renderPage('editlink');
1392         exit;
1393     }
1394
1395     // -------- User want to post a new link: Display link edit form.
1396     if (isset($_GET['post'])) {
1397         $url = cleanup_url($_GET['post']);
1398
1399         $link_is_new = false;
1400         // Check if URL is not already in database (in this case, we will edit the existing link)
1401         $link = $LINKSDB->getLinkFromUrl($url);
1402         if (! $link)
1403         {
1404             $link_is_new = true;
1405             $linkdate = strval(date(LinkDB::LINK_DATE_FORMAT));
1406             // Get title if it was provided in URL (by the bookmarklet).
1407             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1408             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1409             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1410             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1411             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1412             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1413             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1414                 // Short timeout to keep the application responsive
1415                 list($headers, $content) = get_http_response($url, 4);
1416                 if (strpos($headers[0], '200 OK') !== false) {
1417                     // Retrieve charset.
1418                     $charset = get_charset($headers, $content);
1419                     // Extract title.
1420                     $title = html_extract_title($content);
1421                     // Re-encode title in utf-8 if necessary.
1422                     if (! empty($title) && strtolower($charset) != 'utf-8') {
1423                         $title = mb_convert_encoding($title, 'utf-8', $charset);
1424                     }
1425                 }
1426             }
1427
1428             if ($url == '') {
1429                 $url = '?' . smallHash($linkdate . $LINKSDB->getNextId());
1430                 $title = 'Note: ';
1431             }
1432             $url = escape($url);
1433             $title = escape($title);
1434
1435             $link = array(
1436                 'linkdate' => $linkdate,
1437                 'title' => $title,
1438                 'url' => $url,
1439                 'description' => $description,
1440                 'tags' => $tags,
1441                 'private' => $private
1442             );
1443         } else {
1444             $link['linkdate'] = $link['created']->format(LinkDB::LINK_DATE_FORMAT);
1445         }
1446
1447         $data = array(
1448             'link' => $link,
1449             'link_is_new' => $link_is_new,
1450             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1451             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1452             'tags' => $LINKSDB->allTags(),
1453             'default_private_links' => $conf->get('privacy.default_private_links', false),
1454         );
1455         $pluginManager->executeHooks('render_editlink', $data);
1456
1457         foreach ($data as $key => $value) {
1458             $PAGE->assign($key, $value);
1459         }
1460
1461         $PAGE->renderPage('editlink');
1462         exit;
1463     }
1464
1465     if ($targetPage == Router::$PAGE_EXPORT) {
1466         // Export links as a Netscape Bookmarks file
1467
1468         if (empty($_GET['selection'])) {
1469             $PAGE->renderPage('export');
1470             exit;
1471         }
1472
1473         // export as bookmarks_(all|private|public)_YYYYmmdd_HHMMSS.html
1474         $selection = $_GET['selection'];
1475         if (isset($_GET['prepend_note_url'])) {
1476             $prependNoteUrl = $_GET['prepend_note_url'];
1477         } else {
1478             $prependNoteUrl = false;
1479         }
1480
1481         try {
1482             $PAGE->assign(
1483                 'links',
1484                 NetscapeBookmarkUtils::filterAndFormat(
1485                     $LINKSDB,
1486                     $selection,
1487                     $prependNoteUrl,
1488                     index_url($_SERVER)
1489                 )
1490             );
1491         } catch (Exception $exc) {
1492             header('Content-Type: text/plain; charset=utf-8');
1493             echo $exc->getMessage();
1494             exit;
1495         }
1496         $now = new DateTime();
1497         header('Content-Type: text/html; charset=utf-8');
1498         header(
1499             'Content-disposition: attachment; filename=bookmarks_'
1500            .$selection.'_'.$now->format(LinkDB::LINK_DATE_FORMAT).'.html'
1501         );
1502         $PAGE->assign('date', $now->format(DateTime::RFC822));
1503         $PAGE->assign('eol', PHP_EOL);
1504         $PAGE->assign('selection', $selection);
1505         $PAGE->renderPage('export.bookmarks');
1506         exit;
1507     }
1508
1509     if ($targetPage == Router::$PAGE_IMPORT) {
1510         // Upload a Netscape bookmark dump to import its contents
1511
1512         if (! isset($_POST['token']) || ! isset($_FILES['filetoupload'])) {
1513             // Show import dialog
1514             $PAGE->assign(
1515                 'maxfilesize',
1516                 get_max_upload_size(
1517                     ini_get('post_max_size'),
1518                     ini_get('upload_max_filesize'),
1519                     false
1520                 )
1521             );
1522             $PAGE->assign(
1523                 'maxfilesizeHuman',
1524                 get_max_upload_size(
1525                     ini_get('post_max_size'),
1526                     ini_get('upload_max_filesize'),
1527                     true
1528                 )
1529             );
1530             $PAGE->renderPage('import');
1531             exit;
1532         }
1533
1534         // Import bookmarks from an uploaded file
1535         if (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size'] == 0) {
1536             // The file is too big or some form field may be missing.
1537             echo '<script>alert("The file you are trying to upload is probably'
1538                 .' bigger than what this webserver can accept ('
1539                 .get_max_upload_size(ini_get('post_max_size'), ini_get('upload_max_filesize')).').'
1540                 .' Please upload in smaller chunks.");document.location=\'?do='
1541                 .Router::$PAGE_IMPORT .'\';</script>';
1542             exit;
1543         }
1544         if (! tokenOk($_POST['token'])) {
1545             die('Wrong token.');
1546         }
1547         $status = NetscapeBookmarkUtils::import(
1548             $_POST,
1549             $_FILES,
1550             $LINKSDB,
1551             $conf,
1552             $history
1553         );
1554         echo '<script>alert("'.$status.'");document.location=\'?do='
1555              .Router::$PAGE_IMPORT .'\';</script>';
1556         exit;
1557     }
1558
1559     // Plugin administration page
1560     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1561         $pluginMeta = $pluginManager->getPluginsMeta();
1562
1563         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1564         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1565         // Load parameters.
1566         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $conf->get('plugins', array()));
1567         uasort(
1568             $enabledPlugins,
1569             function($a, $b) { return $a['order'] - $b['order']; }
1570         );
1571         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1572
1573         $PAGE->assign('enabledPlugins', $enabledPlugins);
1574         $PAGE->assign('disabledPlugins', $disabledPlugins);
1575         $PAGE->renderPage('pluginsadmin');
1576         exit;
1577     }
1578
1579     // Plugin administration form action
1580     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1581         $history->updateSettings();
1582         try {
1583             if (isset($_POST['parameters_form'])) {
1584                 unset($_POST['parameters_form']);
1585                 foreach ($_POST as $param => $value) {
1586                     $conf->set('plugins.'. $param, escape($value));
1587                 }
1588             }
1589             else {
1590                 $conf->set('general.enabled_plugins', save_plugin_config($_POST));
1591             }
1592             $conf->write(isLoggedIn());
1593         }
1594         catch (Exception $e) {
1595             error_log(
1596                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1597                 $e->getMessage()
1598             );
1599
1600             // TODO: do not handle exceptions/errors in JS.
1601             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do='. Router::$PAGE_PLUGINSADMIN .'\';</script>';
1602             exit;
1603         }
1604         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1605         exit;
1606     }
1607
1608     // -------- Otherwise, simply display search form and links:
1609     showLinkList($PAGE, $LINKSDB, $conf, $pluginManager);
1610     exit;
1611 }
1612
1613 /**
1614  * Template for the list of links (<div id="linklist">)
1615  * This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1616  *
1617  * @param pageBuilder   $PAGE          pageBuilder instance.
1618  * @param LinkDB        $LINKSDB       LinkDB instance.
1619  * @param ConfigManager $conf          Configuration Manager instance.
1620  * @param PluginManager $pluginManager Plugin Manager instance.
1621  */
1622 function buildLinkList($PAGE,$LINKSDB, $conf, $pluginManager)
1623 {
1624     // Used in templates
1625     $searchtags = !empty($_GET['searchtags']) ? escape(normalize_spaces($_GET['searchtags'])) : '';
1626     $searchterm = !empty($_GET['searchterm']) ? escape(normalize_spaces($_GET['searchterm'])) : '';
1627
1628     // Smallhash filter
1629     if (! empty($_SERVER['QUERY_STRING'])
1630         && preg_match('/^[a-zA-Z0-9-_@]{6}($|&|#)/', $_SERVER['QUERY_STRING'])) {
1631         try {
1632             $linksToDisplay = $LINKSDB->filterHash($_SERVER['QUERY_STRING']);
1633         } catch (LinkNotFoundException $e) {
1634             $PAGE->render404($e->getMessage());
1635             exit;
1636         }
1637     } else {
1638         // Filter links according search parameters.
1639         $visibility = ! empty($_SESSION['privateonly']) ? 'private' : 'all';
1640         $linksToDisplay = $LINKSDB->filterSearch($_GET, false, $visibility);
1641     }
1642
1643     // ---- Handle paging.
1644     $keys = array();
1645     foreach ($linksToDisplay as $key => $value) {
1646         $keys[] = $key;
1647     }
1648
1649
1650
1651     // Select articles according to paging.
1652     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1653     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1654     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1655     $page = $page < 1 ? 1 : $page;
1656     $page = $page > $pagecount ? $pagecount : $page;
1657     // Start index.
1658     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1659     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1660     $linkDisp = array();
1661     while ($i<$end && $i<count($keys))
1662     {
1663         $link = $linksToDisplay[$keys[$i]];
1664         $link['description'] = format_description($link['description'], $conf->get('redirector.url'));
1665         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
1666         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
1667         $link['timestamp'] = $link['created']->getTimestamp();
1668         if (! empty($link['updated'])) {
1669             $link['updated_timestamp'] = $link['updated']->getTimestamp();
1670         } else {
1671             $link['updated_timestamp'] = '';
1672         }
1673         $taglist = preg_split('/\s+/', $link['tags'], -1, PREG_SPLIT_NO_EMPTY);
1674         uasort($taglist, 'strcasecmp');
1675         $link['taglist'] = $taglist;
1676         // Check for both signs of a note: starting with ? and 7 chars long.
1677         if ($link['url'][0] === '?' &&
1678             strlen($link['url']) === 7) {
1679             $link['url'] = index_url($_SERVER) . $link['url'];
1680         }
1681
1682         $linkDisp[$keys[$i]] = $link;
1683         $i++;
1684     }
1685
1686     // Compute paging navigation
1687     $searchtagsUrl = empty($searchtags) ? '' : '&searchtags=' . urlencode($searchtags);
1688     $searchtermUrl = empty($searchterm) ? '' : '&searchterm=' . urlencode($searchterm);
1689     $previous_page_url = '';
1690     if ($i != count($keys)) {
1691         $previous_page_url = '?page=' . ($page+1) . $searchtermUrl . $searchtagsUrl;
1692     }
1693     $next_page_url='';
1694     if ($page>1) {
1695         $next_page_url = '?page=' . ($page-1) . $searchtermUrl . $searchtagsUrl;
1696     }
1697
1698     // Fill all template fields.
1699     $data = array(
1700         'previous_page_url' => $previous_page_url,
1701         'next_page_url' => $next_page_url,
1702         'page_current' => $page,
1703         'page_max' => $pagecount,
1704         'result_count' => count($linksToDisplay),
1705         'search_term' => $searchterm,
1706         'search_tags' => $searchtags,
1707         'visibility' => ! empty($_SESSION['privateonly']) ? 'private' : '',
1708         'redirector' => $conf->get('redirector.url'),  // Optional redirector URL.
1709         'links' => $linkDisp,
1710         'tags' => $LINKSDB->allTags(),
1711     );
1712
1713     // If there is only a single link, we change on-the-fly the title of the page.
1714     if (count($linksToDisplay) == 1) {
1715         $data['pagetitle'] = $linksToDisplay[$keys[0]]['title'] .' - '. $conf->get('general.title');
1716     }
1717
1718     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
1719
1720     foreach ($data as $key => $value) {
1721         $PAGE->assign($key, $value);
1722     }
1723
1724     return;
1725 }
1726
1727 /**
1728  * Compute the thumbnail for a link.
1729  *
1730  * With a link to the original URL.
1731  * Understands various services (youtube.com...)
1732  * Input: $url = URL for which the thumbnail must be found.
1733  *        $href = if provided, this URL will be followed instead of $url
1734  * Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1735  * Some of them may be missing.
1736  * Return an empty array if no thumbnail available.
1737  *
1738  * @param ConfigManager $conf Configuration Manager instance.
1739  * @param string        $url
1740  * @param string|bool   $href
1741  *
1742  * @return array
1743  */
1744 function computeThumbnail($conf, $url, $href = false)
1745 {
1746     if (!$conf->get('thumbnail.enable_thumbnails')) return array();
1747     if ($href==false) $href=$url;
1748
1749     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1750     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1751     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1752     $domain = parse_url($url,PHP_URL_HOST);
1753     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1754     {
1755         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1756         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1757                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1758     }
1759     if ($domain=='youtu.be') // Youtube short links
1760     {
1761         $path = parse_url($url,PHP_URL_PATH);
1762         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1763                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1764     }
1765     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1766     {
1767         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1768         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1769                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1770     }
1771
1772     if ($domain=='imgur.com')
1773     {
1774         $path = parse_url($url,PHP_URL_PATH);
1775         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1776         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1777                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1778         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1779                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1780
1781         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1782                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1783     }
1784     if ($domain=='i.imgur.com')
1785     {
1786         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1787         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1788                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1789     }
1790     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1791     {
1792         if (strpos($url,'dailymotion.com/video/')!==false)
1793         {
1794             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1795             return array('src'=>$thumburl,
1796                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1797         }
1798     }
1799     if (endsWith($domain,'.imageshack.us'))
1800     {
1801         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1802         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1803         {
1804             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1805             return array('src'=>$thumburl,
1806                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1807         }
1808     }
1809
1810     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1811     // So we deport the thumbnail generation in order not to slow down page generation
1812     // (and we also cache the thumbnail)
1813
1814     if (! $conf->get('thumbnail.enable_localcache')) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1815
1816     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1817         || $domain=='vimeo.com'
1818         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1819         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1820     )
1821     {
1822         if ($domain=='vimeo.com')
1823         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1824             $path = parse_url($url,PHP_URL_PATH);
1825             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1826         }
1827         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
1828         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
1829             $path = parse_url($url,PHP_URL_PATH);
1830             if (!preg_match('!/\d+.+?!',$path)) return array();
1831         }
1832         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
1833         {   // Make sure this TED URL points to a video (/talks/...)
1834             $path = parse_url($url,PHP_URL_PATH);
1835             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
1836         }
1837         $sign = hash_hmac('sha256', $url, $conf->get('credentials.salt')); // We use the salt to sign data (it's random, secret, and specific to each installation)
1838         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1839                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1840     }
1841
1842     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1843     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1844     // But using the extension will do.
1845     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1846     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1847     {
1848         $sign = hash_hmac('sha256', $url, $conf->get('credentials.salt')); // We use the salt to sign data (it's random, secret, and specific to each installation)
1849         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1850                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1851     }
1852     return array(); // No thumbnail.
1853
1854 }
1855
1856
1857 // Returns the HTML code to display a thumbnail for a link
1858 // with a link to the original URL.
1859 // Understands various services (youtube.com...)
1860 // Input: $url = URL for which the thumbnail must be found.
1861 //        $href = if provided, this URL will be followed instead of $url
1862 // Returns '' if no thumbnail available.
1863 function thumbnail($url,$href=false)
1864 {
1865     // FIXME!
1866     global $conf;
1867     $t = computeThumbnail($conf, $url,$href);
1868     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1869
1870     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
1871     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1872     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1873     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1874     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1875     $html.='></a>';
1876     return $html;
1877 }
1878
1879 // Returns the HTML code to display a thumbnail for a link
1880 // for the picture wall (using lazy image loading)
1881 // Understands various services (youtube.com...)
1882 // Input: $url = URL for which the thumbnail must be found.
1883 //        $href = if provided, this URL will be followed instead of $url
1884 // Returns '' if no thumbnail available.
1885 function lazyThumbnail($conf, $url,$href=false)
1886 {
1887     // FIXME!
1888     global $conf;
1889     $t = computeThumbnail($conf, $url,$href);
1890     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1891
1892     $html='<a href="'.escape($t['href']).'">';
1893
1894     // Lazy image
1895     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
1896
1897     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1898     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1899     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1900     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1901     $html.='>';
1902
1903     // No-JavaScript fallback.
1904     $html.='<noscript><img src="'.escape($t['src']).'"';
1905     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1906     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1907     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1908     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1909     $html.='></noscript></a>';
1910
1911     return $html;
1912 }
1913
1914
1915 /**
1916  * Installation
1917  * This function should NEVER be called if the file data/config.php exists.
1918  *
1919  * @param ConfigManager $conf Configuration Manager instance.
1920  */
1921 function install($conf)
1922 {
1923     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
1924     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
1925
1926
1927     // This part makes sure sessions works correctly.
1928     // (Because on some hosts, session.save_path may not be set correctly,
1929     // or we may not have write access to it.)
1930     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
1931     {   // Step 2: Check if data in session is correct.
1932         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
1933         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
1934         echo 'It currently points to '.session_save_path().'<br>';
1935         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
1936         echo '<br><a href="?">Click to try again.</a></pre>';
1937         die;
1938     }
1939     if (!isset($_SESSION['session_tested']))
1940     {   // Step 1 : Try to store data in session and reload page.
1941         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
1942         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
1943     }
1944     if (isset($_GET['test_session']))
1945     {   // Step 3: Sessions are OK. Remove test parameter from URL.
1946         header('Location: '.index_url($_SERVER));
1947     }
1948
1949
1950     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
1951     {
1952         $tz = 'UTC';
1953         if (!empty($_POST['continent']) && !empty($_POST['city'])
1954             && isTimeZoneValid($_POST['continent'], $_POST['city'])
1955         ) {
1956             $tz = $_POST['continent'].'/'.$_POST['city'];
1957         }
1958         $conf->set('general.timezone', $tz);
1959         $login = $_POST['setlogin'];
1960         $conf->set('credentials.login', $login);
1961         $salt = sha1(uniqid('', true) .'_'. mt_rand());
1962         $conf->set('credentials.salt', $salt);
1963         $conf->set('credentials.hash', sha1($_POST['setpassword'] . $login . $salt));
1964         if (!empty($_POST['title'])) {
1965             $conf->set('general.title', escape($_POST['title']));
1966         } else {
1967             $conf->set('general.title', 'Shared links on '.escape(index_url($_SERVER)));
1968         }
1969         $conf->set('updates.check_updates', !empty($_POST['updateCheck']));
1970         $conf->set('api.enabled', !empty($_POST['enableApi']));
1971         $conf->set(
1972             'api.secret',
1973             generate_api_secret(
1974                 $conf->get('credentials.login'),
1975                 $conf->get('credentials.salt')
1976             )
1977         );
1978         try {
1979             // Everything is ok, let's create config file.
1980             $conf->write(isLoggedIn());
1981         }
1982         catch(Exception $e) {
1983             error_log(
1984                     'ERROR while writing config file after installation.' . PHP_EOL .
1985                     $e->getMessage()
1986                 );
1987
1988             // TODO: do not handle exceptions/errors in JS.
1989             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
1990             exit;
1991         }
1992         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
1993         exit;
1994     }
1995
1996     $PAGE = new PageBuilder($conf);
1997     list($continents, $cities) = generateTimeZoneData(timezone_identifiers_list(), date_default_timezone_get());
1998     $PAGE->assign('continents', $continents);
1999     $PAGE->assign('cities', $cities);
2000     $PAGE->renderPage('install');
2001     exit;
2002 }
2003
2004 /**
2005  * Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2006  * I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2007  * The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2008  * This function is called by passing the URL:
2009  * http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2010  * [URL] is the URL of the link (e.g. a flickr page)
2011  * [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2012  * The function below will fetch the image from the webservice and store it in the cache.
2013  *
2014  * @param ConfigManager $conf Configuration Manager instance,
2015  */
2016 function genThumbnail($conf)
2017 {
2018     // Make sure the parameters in the URL were generated by us.
2019     $sign = hash_hmac('sha256', $_GET['url'], $conf->get('credentials.salt'));
2020     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2021
2022     $cacheDir = $conf->get('resource.thumbnails_cache', 'cache');
2023     // Let's see if we don't already have the image for this URL in the cache.
2024     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2025     if (is_file($cacheDir .'/'. $thumbname))
2026     {   // We have the thumbnail, just serve it:
2027         header('Content-Type: image/jpeg');
2028         echo file_get_contents($cacheDir .'/'. $thumbname);
2029         return;
2030     }
2031     // We may also serve a blank image (if service did not respond)
2032     $blankname=hash('sha1',$_GET['url']).'.gif';
2033     if (is_file($cacheDir .'/'. $blankname))
2034     {
2035         header('Content-Type: image/gif');
2036         echo file_get_contents($cacheDir .'/'. $blankname);
2037         return;
2038     }
2039
2040     // Otherwise, generate the thumbnail.
2041     $url = $_GET['url'];
2042     $domain = parse_url($url,PHP_URL_HOST);
2043
2044     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2045     {
2046         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2047         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2048
2049         // Is this a link to an image, or to a flickr page ?
2050         $imageurl='';
2051         if (endsWith(parse_url($url, PHP_URL_PATH), '.jpg'))
2052         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2053             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2054             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2055         }
2056         else // This is a flickr page (html)
2057         {
2058             // Get the flickr html page.
2059             list($headers, $content) = get_http_response($url, 20);
2060             if (strpos($headers[0], '200 OK') !== false)
2061             {
2062                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2063                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2064                 if (!empty($matches[1])) $imageurl=$matches[1];
2065
2066                 // In albums (and some other pages), the link rel="image_src" is not provided,
2067                 // but flickr provides:
2068                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2069                 if ($imageurl=='')
2070                 {
2071                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2072                     if (!empty($matches[1])) $imageurl=$matches[1];
2073                 }
2074             }
2075         }
2076
2077         if ($imageurl!='')
2078         {   // Let's download the image.
2079             // Image is 240x120, so 10 seconds to download should be enough.
2080             list($headers, $content) = get_http_response($imageurl, 10);
2081             if (strpos($headers[0], '200 OK') !== false) {
2082                 // Save image to cache.
2083                 file_put_contents($cacheDir .'/'. $thumbname, $content);
2084                 header('Content-Type: image/jpeg');
2085                 echo $content;
2086                 return;
2087             }
2088         }
2089     }
2090
2091     elseif ($domain=='vimeo.com' )
2092     {
2093         // This is more complex: we have to perform a HTTP request, then parse the result.
2094         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2095         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2096         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2097         if (strpos($headers[0], '200 OK') !== false) {
2098             $t = unserialize($content);
2099             $imageurl = $t[0]['thumbnail_medium'];
2100             // Then we download the image and serve it to our client.
2101             list($headers, $content) = get_http_response($imageurl, 10);
2102             if (strpos($headers[0], '200 OK') !== false) {
2103                 // Save image to cache.
2104                 file_put_contents($cacheDir .'/'. $thumbname, $content);
2105                 header('Content-Type: image/jpeg');
2106                 echo $content;
2107                 return;
2108             }
2109         }
2110     }
2111
2112     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2113     {
2114         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2115         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2116         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2117         list($headers, $content) = get_http_response($url, 5);
2118         if (strpos($headers[0], '200 OK') !== false) {
2119             // Extract the link to the thumbnail
2120             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2121             if (!empty($matches[1]))
2122             {   // Let's download the image.
2123                 $imageurl=$matches[1];
2124                 // No control on image size, so wait long enough
2125                 list($headers, $content) = get_http_response($imageurl, 20);
2126                 if (strpos($headers[0], '200 OK') !== false) {
2127                     $filepath = $cacheDir .'/'. $thumbname;
2128                     file_put_contents($filepath, $content); // Save image to cache.
2129                     if (resizeImage($filepath))
2130                     {
2131                         header('Content-Type: image/jpeg');
2132                         echo file_get_contents($filepath);
2133                         return;
2134                     }
2135                 }
2136             }
2137         }
2138     }
2139
2140     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2141     {
2142         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2143         // http://xkcd.com/327/
2144         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2145         list($headers, $content) = get_http_response($url, 5);
2146         if (strpos($headers[0], '200 OK') !== false) {
2147             // Extract the link to the thumbnail
2148             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2149             if (!empty($matches[1]))
2150             {   // Let's download the image.
2151                 $imageurl=$matches[1];
2152                 // No control on image size, so wait long enough
2153                 list($headers, $content) = get_http_response($imageurl, 20);
2154                 if (strpos($headers[0], '200 OK') !== false) {
2155                     $filepath = $cacheDir.'/'.$thumbname;
2156                     // Save image to cache.
2157                     file_put_contents($filepath, $content);
2158                     if (resizeImage($filepath))
2159                     {
2160                         header('Content-Type: image/jpeg');
2161                         echo file_get_contents($filepath);
2162                         return;
2163                     }
2164                 }
2165             }
2166         }
2167     }
2168
2169     else
2170     {
2171         // For all other domains, we try to download the image and make a thumbnail.
2172         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2173         list($headers, $content) = get_http_response($url, 30);
2174         if (strpos($headers[0], '200 OK') !== false) {
2175             $filepath = $cacheDir .'/'.$thumbname;
2176             // Save image to cache.
2177             file_put_contents($filepath, $content);
2178             if (resizeImage($filepath))
2179             {
2180                 header('Content-Type: image/jpeg');
2181                 echo file_get_contents($filepath);
2182                 return;
2183             }
2184         }
2185     }
2186
2187
2188     // Otherwise, return an empty image (8x8 transparent gif)
2189     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2190     // Also put something in cache so that this URL is not requested twice.
2191     file_put_contents($cacheDir .'/'. $blankname, $blankgif);
2192     header('Content-Type: image/gif');
2193     echo $blankgif;
2194 }
2195
2196 // Make a thumbnail of the image (to width: 120 pixels)
2197 // Returns true if success, false otherwise.
2198 function resizeImage($filepath)
2199 {
2200     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2201
2202     // Trick: some stupid people rename GIF as JPEG... or else.
2203     // So we really try to open each image type whatever the extension is.
2204     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2205     $im=false;
2206     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2207     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2208     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2209     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2210     $w = imagesx($im);
2211     $h = imagesy($im);
2212     $ystart = 0; $yheight=$h;
2213     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2214     $nw = 120;   // Desired width
2215     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2216     // Resize image:
2217     $im2 = imagecreatetruecolor($nw,$nh);
2218     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2219     imageinterlace($im2,true); // For progressive JPEG.
2220     $tempname=$filepath.'_TEMP.jpg';
2221     imagejpeg($im2, $tempname, 90);
2222     imagedestroy($im);
2223     imagedestroy($im2);
2224     unlink($filepath);
2225     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2226     return true;
2227 }
2228
2229 if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=genthumbnail')) { genThumbnail($conf); exit; }  // Thumbnail generation/cache does not need the link database.
2230 if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=dailyrss')) { showDailyRSS($conf); exit; }
2231 if (!isset($_SESSION['LINKS_PER_PAGE'])) {
2232     $_SESSION['LINKS_PER_PAGE'] = $conf->get('general.links_per_page', 20);
2233 }
2234
2235 $linkDb = new LinkDB(
2236     $conf->get('resource.datastore'),
2237     isLoggedIn(),
2238     $conf->get('privacy.hide_public_links'),
2239     $conf->get('redirector.url'),
2240     $conf->get('redirector.encode_url')
2241 );
2242
2243 $container = new \Slim\Container();
2244 $container['conf'] = $conf;
2245 $container['plugins'] = $pluginManager;
2246 $app = new \Slim\App($container);
2247
2248 // REST API routes
2249 $app->group('/api/v1', function() {
2250     $this->get('/info', '\Shaarli\Api\Controllers\Info:getInfo')->setName('getInfo');
2251     $this->get('/links', '\Shaarli\Api\Controllers\Links:getLinks')->setName('getLinks');
2252     $this->get('/links/{id:[\d]+}', '\Shaarli\Api\Controllers\Links:getLink')->setName('getLink');
2253     $this->post('/links', '\Shaarli\Api\Controllers\Links:postLink')->setName('postLink');
2254     $this->put('/links/{id:[\d]+}', '\Shaarli\Api\Controllers\Links:putLink')->setName('putLink');
2255     $this->delete('/links/{id:[\d]+}', '\Shaarli\Api\Controllers\Links:deleteLink')->setName('deleteLink');
2256     $this->get('/history', '\Shaarli\Api\Controllers\History:getHistory')->setName('getHistory');
2257 })->add('\Shaarli\Api\ApiMiddleware');
2258
2259 $response = $app->run(true);
2260 // Hack to make Slim and Shaarli router work together:
2261 // If a Slim route isn't found and NOT API call, we call renderPage().
2262 if ($response->getStatusCode() == 404 && strpos($_SERVER['REQUEST_URI'], '/api/v1') === false) {
2263     // We use UTF-8 for proper international characters handling.
2264     header('Content-Type: text/html; charset=utf-8');
2265     renderPage($conf, $pluginManager, $linkDb);
2266 } else {
2267     $app->respond($response);
2268 }