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://shaarli.readthedocs.io/en/master/Server-requirements/\n"
  52         ."- https://shaarli.readthedocs.io/en/master/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($conf->get('general.timezone', 'UTC'));
 133
 134 ob_start();  // Output buffering for the page cache.
 135
 136 // Prevent caching on client side or proxy: (yes, it's ugly)
 137 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 138 header("Cache-Control: no-store, no-cache, must-revalidate");
 139 header("Cache-Control: post-check=0, pre-check=0", false);
 140 header("Pragma: no-cache");
 141
 142 if (! is_file($conf->getConfigFileExt())) {
 143     // Ensure Shaarli has proper access to its resources
 144     $errors = ApplicationUtils::checkResourcePermissions($conf);
 145
 146     if ($errors != array()) {
 147         $message = '<p>Insufficient permissions:</p><ul>';
 148
 149         foreach ($errors as $error) {
 150             $message .= '<li>'.$error.'</li>';
 151         }
 152         $message .= '</ul>';
 153
 154         header('Content-Type: text/html; charset=utf-8');
 155         echo $message;
 156         exit;
 157     }
 158
 159     // Display the installation form if no existing config is found
 160     install($conf);
 161 }
 162
 163 // a token depending of deployment salt, user password, and the current ip
 164 define('STAY_SIGNED_IN_TOKEN', sha1($conf->get('credentials.hash') . $_SERVER['REMOTE_ADDR'] . $conf->get('credentials.salt')));
 165
 166 // Sniff browser language and set date format accordingly.
 167 if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
 168     autoLocale($_SERVER['HTTP_ACCEPT_LANGUAGE']);
 169 }
 170
 171 /**
 172  * Checking session state (i.e. is the user still logged in)
 173  *
 174  * @param ConfigManager $conf The configuration manager.
 175  *
 176  * @return bool: true if the user is logged in, false otherwise.
 177  */
 178 function setup_login_state($conf)
 179 {
 180     if ($conf->get('security.open_shaarli')) {
 181         return true;
 182     }
 183     $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 184     $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 185     if (! $conf->exists('credentials.login')) {
 186         $userIsLoggedIn = false;  // Shaarli is not configured yet.
 187         $loginFailure = true;
 188     }
 189     if (isset($_COOKIE['shaarli_staySignedIn']) &&
 190         $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 191         !$loginFailure)
 192     {
 193         fillSessionInfo($conf);
 194         $userIsLoggedIn = true;
 195     }
 196     // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 197     if (empty($_SESSION['uid'])
 198         || ($conf->get('security.session_protection_disabled') === false && $_SESSION['ip'] != allIPs())
 199         || time() >= $_SESSION['expires_on'])
 200     {
 201         logout();
 202         $userIsLoggedIn = false;
 203         $loginFailure = true;
 204     }
 205     if (!empty($_SESSION['longlastingsession'])) {
 206         $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 207     }
 208     else {
 209         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 210     }
 211     if (!$loginFailure) {
 212         $userIsLoggedIn = true;
 213     }
 214
 215     return $userIsLoggedIn;
 216 }
 217 $userIsLoggedIn = setup_login_state($conf);
 218
 219 // ------------------------------------------------------------------------------------------
 220 // Session management
 221
 222 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 223 function allIPs()
 224 {
 225     $ip = $_SERVER['REMOTE_ADDR'];
 226     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 227     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 228     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 229     return $ip;
 230 }
 231
 232 /**
 233  * Load user session.
 234  *
 235  * @param ConfigManager $conf Configuration Manager instance.
 236  */
 237 function fillSessionInfo($conf)
 238 {
 239     $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 240     $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 241     $_SESSION['username']= $conf->get('credentials.login');
 242     $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 243 }
 244
 245 /**
 246  * Check that user/password is correct.
 247  *
 248  * @param string        $login    Username
 249  * @param string        $password User password
 250  * @param ConfigManager $conf     Configuration Manager instance.
 251  *
 252  * @return bool: authentication successful or not.
 253  */
 254 function check_auth($login, $password, $conf)
 255 {
 256     $hash = sha1($password . $login . $conf->get('credentials.salt'));
 257     if ($login == $conf->get('credentials.login') && $hash == $conf->get('credentials.hash'))
 258     {   // Login/password is correct.
 259         fillSessionInfo($conf);
 260         logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Login successful');
 261         return true;
 262     }
 263     logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Login failed for user '.$login);
 264     return false;
 265 }
 266
 267 // Returns true if the user is logged in.
 268 function isLoggedIn()
 269 {
 270     global $userIsLoggedIn;
 271     return $userIsLoggedIn;
 272 }
 273
 274 // Force logout.
 275 function logout() {
 276     if (isset($_SESSION)) {
 277         unset($_SESSION['uid']);
 278         unset($_SESSION['ip']);
 279         unset($_SESSION['username']);
 280         unset($_SESSION['privateonly']);
 281         unset($_SESSION['untaggedonly']);
 282     }
 283     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 284 }
 285
 286
 287 // ------------------------------------------------------------------------------------------
 288 // Brute force protection system
 289 // Several consecutive failed logins will ban the IP address for 30 minutes.
 290 if (!is_file($conf->get('resource.ban_file', 'data/ipbans.php'))) {
 291     // FIXME! globals
 292     file_put_contents(
 293         $conf->get('resource.ban_file', 'data/ipbans.php'),
 294         "<?php\n\$GLOBALS['IPBANS']=".var_export(array('FAILURES'=>array(),'BANS'=>array()),true).";\n?>"
 295     );
 296 }
 297 include $conf->get('resource.ban_file', 'data/ipbans.php');
 298 /**
 299  * Signal a failed login. Will ban the IP if too many failures:
 300  *
 301  * @param ConfigManager $conf Configuration Manager instance.
 302  */
 303 function ban_loginFailed($conf)
 304 {
 305     $ip = $_SERVER['REMOTE_ADDR'];
 306     $trusted = $conf->get('security.trusted_proxies', array());
 307     if (in_array($ip, $trusted)) {
 308         $ip = getIpAddressFromProxy($_SERVER, $trusted);
 309         if (!$ip) {
 310             return;
 311         }
 312     }
 313     $gb = $GLOBALS['IPBANS'];
 314     if (! isset($gb['FAILURES'][$ip])) {
 315         $gb['FAILURES'][$ip]=0;
 316     }
 317     $gb['FAILURES'][$ip]++;
 318     if ($gb['FAILURES'][$ip] > ($conf->get('security.ban_after') - 1))
 319     {
 320         $gb['BANS'][$ip] = time() + $conf->get('security.ban_after', 1800);
 321         logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'IP address banned from login');
 322     }
 323     $GLOBALS['IPBANS'] = $gb;
 324     file_put_contents(
 325         $conf->get('resource.ban_file', 'data/ipbans.php'),
 326         "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 327     );
 328 }
 329
 330 /**
 331  * Signals a successful login. Resets failed login counter.
 332  *
 333  * @param ConfigManager $conf Configuration Manager instance.
 334  */
 335 function ban_loginOk($conf)
 336 {
 337     $ip = $_SERVER['REMOTE_ADDR'];
 338     $gb = $GLOBALS['IPBANS'];
 339     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 340     $GLOBALS['IPBANS'] = $gb;
 341     file_put_contents(
 342         $conf->get('resource.ban_file', 'data/ipbans.php'),
 343         "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 344     );
 345 }
 346
 347 /**
 348  * Checks if the user CAN login. If 'true', the user can try to login.
 349  *
 350  * @param ConfigManager $conf Configuration Manager instance.
 351  *
 352  * @return bool: true if the user is allowed to login.
 353  */
 354 function ban_canLogin($conf)
 355 {
 356     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 357     if (isset($gb['BANS'][$ip]))
 358     {
 359         // User is banned. Check if the ban has expired:
 360         if ($gb['BANS'][$ip]<=time())
 361         {   // Ban expired, user can try to login again.
 362             logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Ban lifted.');
 363             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 364             file_put_contents(
 365                 $conf->get('resource.ban_file', 'data/ipbans.php'),
 366                 "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 367             );
 368             return true; // Ban has expired, user can login.
 369         }
 370         return false; // User is banned.
 371     }
 372     return true; // User is not banned.
 373 }
 374
 375 // ------------------------------------------------------------------------------------------
 376 // Process login form: Check if login/password is correct.
 377 if (isset($_POST['login']))
 378 {
 379     if (!ban_canLogin($conf)) die('I said: NO. You are banned for the moment. Go away.');
 380     if (isset($_POST['password'])
 381         && tokenOk($_POST['token'])
 382         && (check_auth($_POST['login'], $_POST['password'], $conf))
 383     ) {   // Login/password is OK.
 384         ban_loginOk($conf);
 385         // If user wants to keep the session cookie even after the browser closes:
 386         if (!empty($_POST['longlastingsession']))
 387         {
 388             $_SESSION['longlastingsession'] = 31536000; // (31536000 seconds = 1 year)
 389             $expiration = time() + $_SESSION['longlastingsession']; // calculate relative cookie expiration (1 year from now)
 390             setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, $expiration, WEB_PATH);
 391             $_SESSION['expires_on'] = $expiration;  // Set session expiration on server-side.
 392
 393             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 394             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 395             // Note: Never forget the trailing slash on the cookie path!
 396             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 397         }
 398         else // Standard session expiration (=when browser closes)
 399         {
 400             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 401             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 402             session_regenerate_id(true);
 403         }
 404
 405         // Optional redirect after login:
 406         if (isset($_GET['post'])) {
 407             $uri = '?post='. urlencode($_GET['post']);
 408             foreach (array('description', 'source', 'title', 'tags') as $param) {
 409                 if (!empty($_GET[$param])) {
 410                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 411                 }
 412             }
 413             header('Location: '. $uri);
 414             exit;
 415         }
 416
 417         if (isset($_GET['edit_link'])) {
 418             header('Location: ?edit_link='. escape($_GET['edit_link']));
 419             exit;
 420         }
 421
 422         if (isset($_POST['returnurl'])) {
 423             // Prevent loops over login screen.
 424             if (strpos($_POST['returnurl'], 'do=login') === false) {
 425                 header('Location: '. generateLocation($_POST['returnurl'], $_SERVER['HTTP_HOST']));
 426                 exit;
 427             }
 428         }
 429         header('Location: ?'); exit;
 430     }
 431     else
 432     {
 433         ban_loginFailed($conf);
 434         $redir = '&username='. $_POST['login'];
 435         if (isset($_GET['post'])) {
 436             $redir .= '&post=' . urlencode($_GET['post']);
 437             foreach (array('description', 'source', 'title', 'tags') as $param) {
 438                 if (!empty($_GET[$param])) {
 439                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 440                 }
 441             }
 442         }
 443         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 444         exit;
 445     }
 446 }
 447
 448 // ------------------------------------------------------------------------------------------
 449 // Token management for XSRF protection
 450 // Token should be used in any form which acts on data (create,update,delete,import...).
 451 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 452
 453 /**
 454  * Returns a token.
 455  *
 456  * @param ConfigManager $conf Configuration Manager instance.
 457  *
 458  * @return string token.
 459  */
 460 function getToken($conf)
 461 {
 462     $rnd = sha1(uniqid('', true) .'_'. mt_rand() . $conf->get('credentials.salt'));  // We generate a random string.
 463     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 464     return $rnd;
 465 }
 466
 467 // Tells if a token is OK. Using this function will destroy the token.
 468 // true=token is OK.
 469 function tokenOk($token)
 470 {
 471     if (isset($_SESSION['tokens'][$token]))
 472     {
 473         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 474         return true; // Token is OK.
 475     }
 476     return false; // Wrong token, or already used.
 477 }
 478
 479 /**
 480  * Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 481  * Gives the last 7 days (which have links).
 482  * This RSS feed cannot be filtered.
 483  *
 484  * @param ConfigManager $conf Configuration Manager instance.
 485  */
 486 function showDailyRSS($conf) {
 487     // Cache system
 488     $query = $_SERVER['QUERY_STRING'];
 489     $cache = new CachedPage(
 490         $conf->get('config.PAGE_CACHE'),
 491         page_url($_SERVER),
 492         startsWith($query,'do=dailyrss') && !isLoggedIn()
 493     );
 494     $cached = $cache->cachedVersion();
 495     if (!empty($cached)) {
 496         echo $cached;
 497         exit;
 498     }
 499
 500     // If cached was not found (or not usable), then read the database and build the response:
 501     // Read links from database (and filter private links if used it not logged in).
 502     $LINKSDB = new LinkDB(
 503         $conf->get('resource.datastore'),
 504         isLoggedIn(),
 505         $conf->get('privacy.hide_public_links'),
 506         $conf->get('redirector.url'),
 507         $conf->get('redirector.encode_url')
 508     );
 509
 510     /* Some Shaarlies may have very few links, so we need to look
 511        back in time until we have enough days ($nb_of_days).
 512     */
 513     $nb_of_days = 7; // We take 7 days.
 514     $today = date('Ymd');
 515     $days = array();
 516
 517     foreach ($LINKSDB as $link) {
 518         $day = $link['created']->format('Ymd'); // Extract day (without time)
 519         if (strcmp($day, $today) < 0) {
 520             if (empty($days[$day])) {
 521                 $days[$day] = array();
 522             }
 523             $days[$day][] = $link;
 524         }
 525
 526         if (count($days) > $nb_of_days) {
 527             break; // Have we collected enough days?
 528         }
 529     }
 530
 531     // Build the RSS feed.
 532     header('Content-Type: application/rss+xml; charset=utf-8');
 533     $pageaddr = escape(index_url($_SERVER));
 534     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 535     echo '<channel>';
 536     echo '<title>Daily - '. $conf->get('general.title') . '</title>';
 537     echo '<link>'. $pageaddr .'</link>';
 538     echo '<description>Daily shared links</description>';
 539     echo '<language>en-en</language>';
 540     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 541
 542     // For each day.
 543     foreach ($days as $day => $links) {
 544         $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 545         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 546
 547         // We pre-format some fields for proper output.
 548         foreach ($links as &$link) {
 549             $link['formatedDescription'] = format_description($link['description'], $conf->get('redirector.url'));
 550             $link['thumbnail'] = thumbnail($conf, $link['url']);
 551             $link['timestamp'] = $link['created']->getTimestamp();
 552             if (startsWith($link['url'], '?')) {
 553                 $link['url'] = index_url($_SERVER) . $link['url'];  // make permalink URL absolute
 554             }
 555         }
 556
 557         // Then build the HTML for this day:
 558         $tpl = new RainTPL;
 559         $tpl->assign('title', $conf->get('general.title'));
 560         $tpl->assign('daydate', $dayDate->getTimestamp());
 561         $tpl->assign('absurl', $absurl);
 562         $tpl->assign('links', $links);
 563         $tpl->assign('rssdate', escape($dayDate->format(DateTime::RSS)));
 564         $tpl->assign('hide_timestamps', $conf->get('privacy.hide_timestamps', false));
 565         $html = $tpl->draw('dailyrss', true);
 566
 567         echo $html . PHP_EOL;
 568     }
 569     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
 570
 571     $cache->cache(ob_get_contents());
 572     ob_end_flush();
 573     exit;
 574 }
 575
 576 /**
 577  * Show the 'Daily' page.
 578  *
 579  * @param PageBuilder   $pageBuilder   Template engine wrapper.
 580  * @param LinkDB        $LINKSDB       LinkDB instance.
 581  * @param ConfigManager $conf          Configuration Manager instance.
 582  * @param PluginManager $pluginManager Plugin Manager instane.
 583  */
 584 function showDaily($pageBuilder, $LINKSDB, $conf, $pluginManager)
 585 {
 586     $day=date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 587     if (isset($_GET['day'])) $day=$_GET['day'];
 588
 589     $days = $LINKSDB->days();
 590     $i = array_search($day,$days);
 591     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
 592     $previousday='';
 593     $nextday='';
 594     if ($i!==false)
 595     {
 596         if ($i>=1) $previousday=$days[$i-1];
 597         if ($i<count($days)-1) $nextday=$days[$i+1];
 598     }
 599
 600     try {
 601         $linksToDisplay = $LINKSDB->filterDay($day);
 602     } catch (Exception $exc) {
 603         error_log($exc);
 604         $linksToDisplay = array();
 605     }
 606
 607     // We pre-format some fields for proper output.
 608     foreach($linksToDisplay as $key=>$link)
 609     {
 610
 611         $taglist = explode(' ',$link['tags']);
 612         uasort($taglist, 'strcasecmp');
 613         $linksToDisplay[$key]['taglist']=$taglist;
 614         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $conf->get('redirector.url'));
 615         $linksToDisplay[$key]['thumbnail'] = thumbnail($conf, $link['url']);
 616         $linksToDisplay[$key]['timestamp'] =  $link['created']->getTimestamp();
 617     }
 618
 619     /* We need to spread the articles on 3 columns.
 620        I did not want to use a JavaScript lib like http://masonry.desandro.com/
 621        so I manually spread entries with a simple method: I roughly evaluate the
 622        height of a div according to title and description length.
 623     */
 624     $columns=array(array(),array(),array()); // Entries to display, for each column.
 625     $fill=array(0,0,0);  // Rough estimate of columns fill.
 626     foreach($linksToDisplay as $key=>$link)
 627     {
 628         // Roughly estimate length of entry (by counting characters)
 629         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
 630         // Description: 836 characters gives roughly 342 pixel height.
 631         // This is not perfect, but it's usually OK.
 632         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
 633         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
 634         // Then put in column which is the less filled:
 635         $smallest=min($fill); // find smallest value in array.
 636         $index=array_search($smallest,$fill); // find index of this smallest value.
 637         array_push($columns[$index],$link); // Put entry in this column.
 638         $fill[$index]+=$length;
 639     }
 640
 641     $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 642     $data = array(
 643         'pagetitle' => $conf->get('general.title') .' - '. format_date($dayDate, false),
 644         'linksToDisplay' => $linksToDisplay,
 645         'cols' => $columns,
 646         'day' => $dayDate->getTimestamp(),
 647         'dayDate' => $dayDate,
 648         'previousday' => $previousday,
 649         'nextday' => $nextday,
 650     );
 651
 652     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
 653
 654     foreach ($data as $key => $value) {
 655         $pageBuilder->assign($key, $value);
 656     }
 657
 658     $pageBuilder->renderPage('daily');
 659     exit;
 660 }
 661
 662 /**
 663  * Renders the linklist
 664  *
 665  * @param pageBuilder   $PAGE    pageBuilder instance.
 666  * @param LinkDB        $LINKSDB LinkDB instance.
 667  * @param ConfigManager $conf    Configuration Manager instance.
 668  * @param PluginManager $pluginManager Plugin Manager instance.
 669  */
 670 function showLinkList($PAGE, $LINKSDB, $conf, $pluginManager) {
 671     buildLinkList($PAGE,$LINKSDB, $conf, $pluginManager); // Compute list of links to display
 672     $PAGE->renderPage('linklist');
 673 }
 674
 675 /**
 676  * Render HTML page (according to URL parameters and user rights)
 677  *
 678  * @param ConfigManager $conf          Configuration Manager instance.
 679  * @param PluginManager $pluginManager Plugin Manager instance,
 680  * @param LinkDB        $LINKSDB
 681  * @param History       $history       instance
 682  */
 683 function renderPage($conf, $pluginManager, $LINKSDB, $history)
 684 {
 685     $updater = new Updater(
 686         read_updates_file($conf->get('resource.updates')),
 687         $LINKSDB,
 688         $conf,
 689         isLoggedIn()
 690     );
 691     try {
 692         $newUpdates = $updater->update();
 693         if (! empty($newUpdates)) {
 694             write_updates_file(
 695                 $conf->get('resource.updates'),
 696                 $updater->getDoneUpdates()
 697             );
 698         }
 699     }
 700     catch(Exception $e) {
 701         die($e->getMessage());
 702     }
 703
 704     $PAGE = new PageBuilder($conf, $LINKSDB);
 705     $PAGE->assign('linkcount', count($LINKSDB));
 706     $PAGE->assign('privateLinkcount', count_private($LINKSDB));
 707     $PAGE->assign('plugin_errors', $pluginManager->getErrors());
 708
 709     // Determine which page will be rendered.
 710     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
 711     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
 712
 713     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
 714     // Then assign generated data to RainTPL.
 715     $common_hooks = array(
 716         'includes',
 717         'header',
 718         'footer',
 719     );
 720
 721     foreach($common_hooks as $name) {
 722         $plugin_data = array();
 723         $pluginManager->executeHooks('render_' . $name, $plugin_data,
 724             array(
 725                 'target' => $targetPage,
 726                 'loggedin' => isLoggedIn()
 727             )
 728         );
 729         $PAGE->assign('plugins_' . $name, $plugin_data);
 730     }
 731
 732     // -------- Display login form.
 733     if ($targetPage == Router::$PAGE_LOGIN)
 734     {
 735         if ($conf->get('security.open_shaarli')) { header('Location: ?'); exit; }  // No need to login for open Shaarli
 736         if (isset($_GET['username'])) {
 737             $PAGE->assign('username', escape($_GET['username']));
 738         }
 739         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
 740         $PAGE->renderPage('loginform');
 741         exit;
 742     }
 743     // -------- User wants to logout.
 744     if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=logout'))
 745     {
 746         invalidateCaches($conf->get('resource.page_cache'));
 747         logout();
 748         header('Location: ?');
 749         exit;
 750     }
 751
 752     // -------- Picture wall
 753     if ($targetPage == Router::$PAGE_PICWALL)
 754     {
 755         // Optionally filter the results:
 756         $links = $LINKSDB->filterSearch($_GET);
 757         $linksToDisplay = array();
 758
 759         // Get only links which have a thumbnail.
 760         foreach($links as $link)
 761         {
 762             $permalink='?'.$link['shorturl'];
 763             $thumb=lazyThumbnail($conf, $link['url'],$permalink);
 764             if ($thumb!='') // Only output links which have a thumbnail.
 765             {
 766                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
 767                 $linksToDisplay[]=$link; // Add to array.
 768             }
 769         }
 770
 771         $data = array(
 772             'linksToDisplay' => $linksToDisplay,
 773         );
 774         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
 775
 776         foreach ($data as $key => $value) {
 777             $PAGE->assign($key, $value);
 778         }
 779
 780         $PAGE->renderPage('picwall');
 781         exit;
 782     }
 783
 784     // -------- Tag cloud
 785     if ($targetPage == Router::$PAGE_TAGCLOUD)
 786     {
 787         $visibility = ! empty($_SESSION['privateonly']) ? 'private' : 'all';
 788         $filteringTags = isset($_GET['searchtags']) ? explode(' ', $_GET['searchtags']) : [];
 789         $tags = $LINKSDB->linksCountPerTag($filteringTags, $visibility);
 790
 791         // We sort tags alphabetically, then choose a font size according to count.
 792         // First, find max value.
 793         $maxcount = 0;
 794         foreach ($tags as $value) {
 795             $maxcount = max($maxcount, $value);
 796         }
 797
 798         alphabetical_sort($tags, false, true);
 799
 800         $tagList = array();
 801         foreach($tags as $key => $value) {
 802             if (in_array($key, $filteringTags)) {
 803                 continue;
 804             }
 805             // Tag font size scaling:
 806             //   default 15 and 30 logarithm bases affect scaling,
 807             //   22 and 6 are arbitrary font sizes for max and min sizes.
 808             $size = log($value, 15) / log($maxcount, 30) * 2.2 + 0.8;
 809             $tagList[$key] = array(
 810                 'count' => $value,
 811                 'size' => number_format($size, 2, '.', ''),
 812             );
 813         }
 814
 815         $data = array(
 816             'search_tags' => implode(' ', $filteringTags),
 817             'tags' => $tagList,
 818         );
 819         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
 820
 821         foreach ($data as $key => $value) {
 822             $PAGE->assign($key, $value);
 823         }
 824
 825         $PAGE->renderPage('tag.cloud');
 826         exit;
 827     }
 828
 829     // -------- Tag list
 830     if ($targetPage == Router::$PAGE_TAGLIST)
 831     {
 832         $visibility = ! empty($_SESSION['privateonly']) ? 'private' : 'all';
 833         $filteringTags = isset($_GET['searchtags']) ? explode(' ', $_GET['searchtags']) : [];
 834         $tags = $LINKSDB->linksCountPerTag($filteringTags, $visibility);
 835         foreach ($filteringTags as $tag) {
 836             if (array_key_exists($tag, $tags)) {
 837                 unset($tags[$tag]);
 838             }
 839         }
 840
 841         if (! empty($_GET['sort']) && $_GET['sort'] === 'alpha') {
 842             alphabetical_sort($tags, false, true);
 843         }
 844
 845         $data = [
 846             'search_tags' => implode(' ', $filteringTags),
 847             'tags' => $tags,
 848         ];
 849         $pluginManager->executeHooks('render_taglist', $data, ['loggedin' => isLoggedIn()]);
 850
 851         foreach ($data as $key => $value) {
 852             $PAGE->assign($key, $value);
 853         }
 854
 855         $PAGE->renderPage('tag.list');
 856         exit;
 857     }
 858
 859     // Daily page.
 860     if ($targetPage == Router::$PAGE_DAILY) {
 861         showDaily($PAGE, $LINKSDB, $conf, $pluginManager);
 862     }
 863
 864     // ATOM and RSS feed.
 865     if ($targetPage == Router::$PAGE_FEED_ATOM || $targetPage == Router::$PAGE_FEED_RSS) {
 866         $feedType = $targetPage == Router::$PAGE_FEED_RSS ? FeedBuilder::$FEED_RSS : FeedBuilder::$FEED_ATOM;
 867         header('Content-Type: application/'. $feedType .'+xml; charset=utf-8');
 868
 869         // Cache system
 870         $query = $_SERVER['QUERY_STRING'];
 871         $cache = new CachedPage(
 872             $conf->get('resource.page_cache'),
 873             page_url($_SERVER),
 874             startsWith($query,'do='. $targetPage) && !isLoggedIn()
 875         );
 876         $cached = $cache->cachedVersion();
 877         if (!empty($cached)) {
 878             echo $cached;
 879             exit;
 880         }
 881
 882         // Generate data.
 883         $feedGenerator = new FeedBuilder($LINKSDB, $feedType, $_SERVER, $_GET, isLoggedIn());
 884         $feedGenerator->setLocale(strtolower(setlocale(LC_COLLATE, 0)));
 885         $feedGenerator->setHideDates($conf->get('privacy.hide_timestamps') && !isLoggedIn());
 886         $feedGenerator->setUsePermalinks(isset($_GET['permalinks']) || !$conf->get('feed.rss_permalinks'));
 887         $data = $feedGenerator->buildData();
 888
 889         // Process plugin hook.
 890         $pluginManager->executeHooks('render_feed', $data, array(
 891             'loggedin' => isLoggedIn(),
 892             'target' => $targetPage,
 893         ));
 894
 895         // Render the template.
 896         $PAGE->assignAll($data);
 897         $PAGE->renderPage('feed.'. $feedType);
 898         $cache->cache(ob_get_contents());
 899         ob_end_flush();
 900         exit;
 901     }
 902
 903     // Display opensearch plugin (XML)
 904     if ($targetPage == Router::$PAGE_OPENSEARCH) {
 905         header('Content-Type: application/xml; charset=utf-8');
 906         $PAGE->assign('serverurl', index_url($_SERVER));
 907         $PAGE->renderPage('opensearch');
 908         exit;
 909     }
 910
 911     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
 912     if (isset($_GET['addtag']))
 913     {
 914         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
 915         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
 916         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
 917
 918         // Prevent redirection loop
 919         if (isset($params['addtag'])) {
 920             unset($params['addtag']);
 921         }
 922
 923         // Check if this tag is already in the search query and ignore it if it is.
 924         // Each tag is always separated by a space
 925         if (isset($params['searchtags'])) {
 926             $current_tags = explode(' ', $params['searchtags']);
 927         } else {
 928             $current_tags = array();
 929         }
 930         $addtag = true;
 931         foreach ($current_tags as $value) {
 932             if ($value === $_GET['addtag']) {
 933                 $addtag = false;
 934                 break;
 935             }
 936         }
 937         // Append the tag if necessary
 938         if (empty($params['searchtags'])) {
 939             $params['searchtags'] = trim($_GET['addtag']);
 940         }
 941         else if ($addtag) {
 942             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
 943         }
 944
 945         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
 946         header('Location: ?'.http_build_query($params));
 947         exit;
 948     }
 949
 950     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
 951     if (isset($_GET['removetag'])) {
 952         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
 953         if (empty($_SERVER['HTTP_REFERER'])) {
 954             header('Location: ?');
 955             exit;
 956         }
 957
 958         // In case browser does not send HTTP_REFERER
 959         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
 960
 961         // Prevent redirection loop
 962         if (isset($params['removetag'])) {
 963             unset($params['removetag']);
 964         }
 965
 966         if (isset($params['searchtags'])) {
 967             $tags = explode(' ', $params['searchtags']);
 968             // Remove value from array $tags.
 969             $tags = array_diff($tags, array($_GET['removetag']));
 970             $params['searchtags'] = implode(' ',$tags);
 971
 972             if (empty($params['searchtags'])) {
 973                 unset($params['searchtags']);
 974             }
 975
 976             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
 977         }
 978         header('Location: ?'.http_build_query($params));
 979         exit;
 980     }
 981
 982     // -------- User wants to change the number of links per page (linksperpage=...)
 983     if (isset($_GET['linksperpage'])) {
 984         if (is_numeric($_GET['linksperpage'])) {
 985             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
 986         }
 987
 988         if (! empty($_SERVER['HTTP_REFERER'])) {
 989             $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage'));
 990         } else {
 991             $location = '?';
 992         }
 993         header('Location: '. $location);
 994         exit;
 995     }
 996
 997     // -------- User wants to see only private links (toggle)
 998     if (isset($_GET['privateonly'])) {
 999         if (empty($_SESSION['privateonly'])) {
1000             $_SESSION['privateonly'] = 1; // See only private links
1001         } else {
1002             unset($_SESSION['privateonly']); // See all links
1003         }
1004
1005         if (! empty($_SERVER['HTTP_REFERER'])) {
1006             $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly'));
1007         } else {
1008             $location = '?';
1009         }
1010         header('Location: '. $location);
1011         exit;
1012     }
1013
1014     // -------- User wants to see only untagged links (toggle)
1015     if (isset($_GET['untaggedonly'])) {
1016         $_SESSION['untaggedonly'] = empty($_SESSION['untaggedonly']);
1017
1018         if (! empty($_SERVER['HTTP_REFERER'])) {
1019             $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('untaggedonly'));
1020         } else {
1021             $location = '?';
1022         }
1023         header('Location: '. $location);
1024         exit;
1025     }
1026
1027     // -------- Handle other actions allowed for non-logged in users:
1028     if (!isLoggedIn())
1029     {
1030         // User tries to post new link but is not logged in:
1031         // Show login screen, then redirect to ?post=...
1032         if (isset($_GET['post']))
1033         {
1034             header( // Redirect to login page, then back to post link.
1035                 'Location: ?do=login&post='.urlencode($_GET['post']).
1036                 (!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').
1037                 (!empty($_GET['description'])?'&description='.urlencode($_GET['description']):'').
1038                 (!empty($_GET['tags'])?'&tags='.urlencode($_GET['tags']):'').
1039                 (!empty($_GET['source'])?'&source='.urlencode($_GET['source']):'')
1040             );
1041             exit;
1042         }
1043
1044         showLinkList($PAGE, $LINKSDB, $conf, $pluginManager);
1045         if (isset($_GET['edit_link'])) {
1046             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1047             exit;
1048         }
1049
1050         exit; // Never remove this one! All operations below are reserved for logged in user.
1051     }
1052
1053     // -------- All other functions are reserved for the registered user:
1054
1055     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1056     if ($targetPage == Router::$PAGE_TOOLS)
1057     {
1058         $data = array(
1059             'pageabsaddr' => index_url($_SERVER),
1060             'sslenabled' => !empty($_SERVER['HTTPS'])
1061         );
1062         $pluginManager->executeHooks('render_tools', $data);
1063
1064         foreach ($data as $key => $value) {
1065             $PAGE->assign($key, $value);
1066         }
1067
1068         $PAGE->renderPage('tools');
1069         exit;
1070     }
1071
1072     // -------- User wants to change his/her password.
1073     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1074     {
1075         if ($conf->get('security.open_shaarli')) {
1076             die('You are not supposed to change a password on an Open Shaarli.');
1077         }
1078
1079         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1080         {
1081             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1082
1083             // Make sure old password is correct.
1084             $oldhash = sha1($_POST['oldpassword'].$conf->get('credentials.login').$conf->get('credentials.salt'));
1085             if ($oldhash!= $conf->get('credentials.hash')) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1086             // Save new password
1087             // Salt renders rainbow-tables attacks useless.
1088             $conf->set('credentials.salt', sha1(uniqid('', true) .'_'. mt_rand()));
1089             $conf->set('credentials.hash', sha1($_POST['setpassword'] . $conf->get('credentials.login') . $conf->get('credentials.salt')));
1090             try {
1091                 $conf->write(isLoggedIn());
1092             }
1093             catch(Exception $e) {
1094                 error_log(
1095                     'ERROR while writing config file after changing password.' . PHP_EOL .
1096                     $e->getMessage()
1097                 );
1098
1099                 // TODO: do not handle exceptions/errors in JS.
1100                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1101                 exit;
1102             }
1103             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1104             exit;
1105         }
1106         else // show the change password form.
1107         {
1108             $PAGE->renderPage('changepassword');
1109             exit;
1110         }
1111     }
1112
1113     // -------- User wants to change configuration
1114     if ($targetPage == Router::$PAGE_CONFIGURE)
1115     {
1116         if (!empty($_POST['title']) )
1117         {
1118             if (!tokenOk($_POST['token'])) {
1119                 die('Wrong token.'); // Go away!
1120             }
1121             $tz = 'UTC';
1122             if (!empty($_POST['continent']) && !empty($_POST['city'])
1123                 && isTimeZoneValid($_POST['continent'], $_POST['city'])
1124             ) {
1125                 $tz = $_POST['continent'] . '/' . $_POST['city'];
1126             }
1127             $conf->set('general.timezone', $tz);
1128             $conf->set('general.title', escape($_POST['title']));
1129             $conf->set('general.header_link', escape($_POST['titleLink']));
1130             $conf->set('resource.theme', escape($_POST['theme']));
1131             $conf->set('redirector.url', escape($_POST['redirector']));
1132             $conf->set('security.session_protection_disabled', !empty($_POST['disablesessionprotection']));
1133             $conf->set('privacy.default_private_links', !empty($_POST['privateLinkByDefault']));
1134             $conf->set('feed.rss_permalinks', !empty($_POST['enableRssPermalinks']));
1135             $conf->set('updates.check_updates', !empty($_POST['updateCheck']));
1136             $conf->set('privacy.hide_public_links', !empty($_POST['hidePublicLinks']));
1137             $conf->set('api.enabled', !empty($_POST['enableApi']));
1138             $conf->set('api.secret', escape($_POST['apiSecret']));
1139             try {
1140                 $conf->write(isLoggedIn());
1141                 $history->updateSettings();
1142                 invalidateCaches($conf->get('resource.page_cache'));
1143             }
1144             catch(Exception $e) {
1145                 error_log(
1146                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1147                     $e->getMessage()
1148                 );
1149
1150                 // TODO: do not handle exceptions/errors in JS.
1151                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=configure\';</script>';
1152                 exit;
1153             }
1154             echo '<script>alert("Configuration was saved.");document.location=\'?do=configure\';</script>';
1155             exit;
1156         }
1157         else // Show the configuration form.
1158         {
1159             $PAGE->assign('title', $conf->get('general.title'));
1160             $PAGE->assign('theme', $conf->get('resource.theme'));
1161             $PAGE->assign('theme_available', ThemeUtils::getThemes($conf->get('resource.raintpl_tpl')));
1162             $PAGE->assign('redirector', $conf->get('redirector.url'));
1163             list($continents, $cities) = generateTimeZoneData(
1164                 timezone_identifiers_list(),
1165                 $conf->get('general.timezone')
1166             );
1167             $PAGE->assign('continents', $continents);
1168             $PAGE->assign('cities', $cities);
1169             $PAGE->assign('private_links_default', $conf->get('privacy.default_private_links', false));
1170             $PAGE->assign('session_protection_disabled', $conf->get('security.session_protection_disabled', false));
1171             $PAGE->assign('enable_rss_permalinks', $conf->get('feed.rss_permalinks', false));
1172             $PAGE->assign('enable_update_check', $conf->get('updates.check_updates', true));
1173             $PAGE->assign('hide_public_links', $conf->get('privacy.hide_public_links', false));
1174             $PAGE->assign('api_enabled', $conf->get('api.enabled', true));
1175             $PAGE->assign('api_secret', $conf->get('api.secret'));
1176             $PAGE->renderPage('configure');
1177             exit;
1178         }
1179     }
1180
1181     // -------- User wants to rename a tag or delete it
1182     if ($targetPage == Router::$PAGE_CHANGETAG)
1183     {
1184         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1185             $PAGE->assign('fromtag', ! empty($_GET['fromtag']) ? escape($_GET['fromtag']) : '');
1186             $PAGE->renderPage('changetag');
1187             exit;
1188         }
1189
1190         if (!tokenOk($_POST['token'])) {
1191             die('Wrong token.');
1192         }
1193
1194         $alteredLinks = $LINKSDB->renameTag(escape($_POST['fromtag']), escape($_POST['totag']));
1195         $LINKSDB->save($conf->get('resource.page_cache'));
1196         foreach ($alteredLinks as $link) {
1197             $history->updateLink($link);
1198         }
1199         $delete = empty($_POST['totag']);
1200         $redirect = $delete ? 'do=changetag' : 'searchtags='. urlencode(escape($_POST['totag']));
1201         $alert = $delete
1202             ? sprintf(t('The tag was removed from %d links.'), count($alteredLinks))
1203             : sprintf(t('The tag was renamed in %d links.'), count($alteredLinks));
1204         echo '<script>alert("'. $alert .'");document.location=\'?'. $redirect .'\';</script>';
1205         exit;
1206     }
1207
1208     // -------- User wants to add a link without using the bookmarklet: Show form.
1209     if ($targetPage == Router::$PAGE_ADDLINK)
1210     {
1211         $PAGE->renderPage('addlink');
1212         exit;
1213     }
1214
1215     // -------- User clicked the "Save" button when editing a link: Save link to database.
1216     if (isset($_POST['save_edit']))
1217     {
1218         // Go away!
1219         if (! tokenOk($_POST['token'])) {
1220             die('Wrong token.');
1221         }
1222
1223         // lf_id should only be present if the link exists.
1224         $id = isset($_POST['lf_id']) ? intval(escape($_POST['lf_id'])) : $LINKSDB->getNextId();
1225         // Linkdate is kept here to:
1226         //   - use the same permalink for notes as they're displayed when creating them
1227         //   - let users hack creation date of their posts
1228         //     See: https://shaarli.readthedocs.io/en/master/Various-hacks/#changing-the-timestamp-for-a-shaare
1229         $linkdate = escape($_POST['lf_linkdate']);
1230         if (isset($LINKSDB[$id])) {
1231             // Edit
1232             $created = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $linkdate);
1233             $updated = new DateTime();
1234             $shortUrl = $LINKSDB[$id]['shorturl'];
1235             $new = false;
1236         } else {
1237             // New link
1238             $created = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $linkdate);
1239             $updated = null;
1240             $shortUrl = link_small_hash($created, $id);
1241             $new = true;
1242         }
1243
1244         // Remove multiple spaces.
1245         $tags = trim(preg_replace('/\s\s+/', ' ', $_POST['lf_tags']));
1246         // Remove first '-' char in tags.
1247         $tags = preg_replace('/(^| )\-/', '$1', $tags);
1248         // Remove duplicates.
1249         $tags = implode(' ', array_unique(explode(' ', $tags)));
1250
1251         if (empty(trim($_POST['lf_url']))) {
1252             $_POST['lf_url'] = '?' . smallHash($linkdate . $id);
1253         }
1254         $url = whitelist_protocols(trim($_POST['lf_url']), $conf->get('security.allowed_protocols'));
1255
1256         $link = array(
1257             'id' => $id,
1258             'title' => trim($_POST['lf_title']),
1259             'url' => $url,
1260             'description' => $_POST['lf_description'],
1261             'private' => (isset($_POST['lf_private']) ? 1 : 0),
1262             'created' => $created,
1263             'updated' => $updated,
1264             'tags' => str_replace(',', ' ', $tags),
1265             'shorturl' => $shortUrl,
1266         );
1267
1268         // If title is empty, use the URL as title.
1269         if ($link['title'] == '') {
1270             $link['title'] = $link['url'];
1271         }
1272
1273         $pluginManager->executeHooks('save_link', $link);
1274
1275         $LINKSDB[$id] = $link;
1276         $LINKSDB->save($conf->get('resource.page_cache'));
1277         if ($new) {
1278             $history->addLink($link);
1279         } else {
1280             $history->updateLink($link);
1281         }
1282
1283         // If we are called from the bookmarklet, we must close the popup:
1284         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1285             echo '<script>self.close();</script>';
1286             exit;
1287         }
1288
1289         $returnurl = !empty($_POST['returnurl']) ? $_POST['returnurl'] : '?';
1290         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1291         // Scroll to the link which has been edited.
1292         $location .= '#' . $link['shorturl'];
1293         // After saving the link, redirect to the page the user was on.
1294         header('Location: '. $location);
1295         exit;
1296     }
1297
1298     // -------- User clicked the "Cancel" button when editing a link.
1299     if (isset($_POST['cancel_edit']))
1300     {
1301         $id = isset($_POST['lf_id']) ? (int) escape($_POST['lf_id']) : false;
1302         if (! isset($LINKSDB[$id])) {
1303             header('Location: ?');
1304         }
1305         // If we are called from the bookmarklet, we must close the popup:
1306         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1307         $link = $LINKSDB[$id];
1308         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1309         // Scroll to the link which has been edited.
1310         $returnurl .= '#'. $link['shorturl'];
1311         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1312         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1313         exit;
1314     }
1315
1316     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1317     if ($targetPage == Router::$PAGE_DELETELINK)
1318     {
1319         if (! tokenOk($_GET['token'])) {
1320             die('Wrong token.');
1321         }
1322
1323         if (strpos($_GET['lf_linkdate'], ' ') !== false) {
1324             $ids = array_values(array_filter(preg_split('/\s+/', escape($_GET['lf_linkdate']))));
1325         } else {
1326             $ids = [$_GET['lf_linkdate']];
1327         }
1328         foreach ($ids as $id) {
1329             $id = (int) escape($id);
1330             $link = $LINKSDB[$id];
1331             $pluginManager->executeHooks('delete_link', $link);
1332             unset($LINKSDB[$id]);
1333         }
1334         $LINKSDB->save($conf->get('resource.page_cache')); // save to disk
1335         $history->deleteLink($link);
1336
1337         // If we are called from the bookmarklet, we must close the popup:
1338         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1339
1340         $location = '?';
1341         if (isset($_SERVER['HTTP_REFERER'])) {
1342             // Don't redirect to where we were previously if it was a permalink or an edit_link, because it would 404.
1343             $location = generateLocation(
1344                     $_SERVER['HTTP_REFERER'],
1345                     $_SERVER['HTTP_HOST'],
1346                     ['delete_link', 'edit_link', $link['shorturl']]
1347             );
1348         }
1349
1350         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1351         exit;
1352     }
1353
1354     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1355     if (isset($_GET['edit_link']))
1356     {
1357         $id = (int) escape($_GET['edit_link']);
1358         $link = $LINKSDB[$id];  // Read database
1359         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1360         $link['linkdate'] = $link['created']->format(LinkDB::LINK_DATE_FORMAT);
1361         $data = array(
1362             'link' => $link,
1363             'link_is_new' => false,
1364             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1365             'tags' => $LINKSDB->linksCountPerTag(),
1366         );
1367         $pluginManager->executeHooks('render_editlink', $data);
1368
1369         foreach ($data as $key => $value) {
1370             $PAGE->assign($key, $value);
1371         }
1372
1373         $PAGE->renderPage('editlink');
1374         exit;
1375     }
1376
1377     // -------- User want to post a new link: Display link edit form.
1378     if (isset($_GET['post'])) {
1379         $url = cleanup_url($_GET['post']);
1380
1381         $link_is_new = false;
1382         // Check if URL is not already in database (in this case, we will edit the existing link)
1383         $link = $LINKSDB->getLinkFromUrl($url);
1384         if (! $link)
1385         {
1386             $link_is_new = true;
1387             $linkdate = strval(date(LinkDB::LINK_DATE_FORMAT));
1388             // Get title if it was provided in URL (by the bookmarklet).
1389             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1390             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1391             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1392             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1393             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1394             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1395             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1396                 // Short timeout to keep the application responsive
1397                 list($headers, $content) = get_http_response($url, 4);
1398                 if (strpos($headers[0], '200 OK') !== false) {
1399                     // Retrieve charset.
1400                     $charset = get_charset($headers, $content);
1401                     // Extract title.
1402                     $title = html_extract_title($content);
1403                     // Re-encode title in utf-8 if necessary.
1404                     if (! empty($title) && strtolower($charset) != 'utf-8') {
1405                         $title = mb_convert_encoding($title, 'utf-8', $charset);
1406                     }
1407                 }
1408             }
1409
1410             if ($url == '') {
1411                 $url = '?' . smallHash($linkdate . $LINKSDB->getNextId());
1412                 $title = 'Note: ';
1413             }
1414             $url = escape($url);
1415             $title = escape($title);
1416
1417             $link = array(
1418                 'linkdate' => $linkdate,
1419                 'title' => $title,
1420                 'url' => $url,
1421                 'description' => $description,
1422                 'tags' => $tags,
1423                 'private' => $private,
1424             );
1425         } else {
1426             $link['linkdate'] = $link['created']->format(LinkDB::LINK_DATE_FORMAT);
1427         }
1428
1429         $data = array(
1430             'link' => $link,
1431             'link_is_new' => $link_is_new,
1432             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1433             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1434             'tags' => $LINKSDB->linksCountPerTag(),
1435             'default_private_links' => $conf->get('privacy.default_private_links', false),
1436         );
1437         $pluginManager->executeHooks('render_editlink', $data);
1438
1439         foreach ($data as $key => $value) {
1440             $PAGE->assign($key, $value);
1441         }
1442
1443         $PAGE->renderPage('editlink');
1444         exit;
1445     }
1446
1447     if ($targetPage == Router::$PAGE_EXPORT) {
1448         // Export links as a Netscape Bookmarks file
1449
1450         if (empty($_GET['selection'])) {
1451             $PAGE->renderPage('export');
1452             exit;
1453         }
1454
1455         // export as bookmarks_(all|private|public)_YYYYmmdd_HHMMSS.html
1456         $selection = $_GET['selection'];
1457         if (isset($_GET['prepend_note_url'])) {
1458             $prependNoteUrl = $_GET['prepend_note_url'];
1459         } else {
1460             $prependNoteUrl = false;
1461         }
1462
1463         try {
1464             $PAGE->assign(
1465                 'links',
1466                 NetscapeBookmarkUtils::filterAndFormat(
1467                     $LINKSDB,
1468                     $selection,
1469                     $prependNoteUrl,
1470                     index_url($_SERVER)
1471                 )
1472             );
1473         } catch (Exception $exc) {
1474             header('Content-Type: text/plain; charset=utf-8');
1475             echo $exc->getMessage();
1476             exit;
1477         }
1478         $now = new DateTime();
1479         header('Content-Type: text/html; charset=utf-8');
1480         header(
1481             'Content-disposition: attachment; filename=bookmarks_'
1482            .$selection.'_'.$now->format(LinkDB::LINK_DATE_FORMAT).'.html'
1483         );
1484         $PAGE->assign('date', $now->format(DateTime::RFC822));
1485         $PAGE->assign('eol', PHP_EOL);
1486         $PAGE->assign('selection', $selection);
1487         $PAGE->renderPage('export.bookmarks');
1488         exit;
1489     }
1490
1491     if ($targetPage == Router::$PAGE_IMPORT) {
1492         // Upload a Netscape bookmark dump to import its contents
1493
1494         if (! isset($_POST['token']) || ! isset($_FILES['filetoupload'])) {
1495             // Show import dialog
1496             $PAGE->assign(
1497                 'maxfilesize',
1498                 get_max_upload_size(
1499                     ini_get('post_max_size'),
1500                     ini_get('upload_max_filesize'),
1501                     false
1502                 )
1503             );
1504             $PAGE->assign(
1505                 'maxfilesizeHuman',
1506                 get_max_upload_size(
1507                     ini_get('post_max_size'),
1508                     ini_get('upload_max_filesize'),
1509                     true
1510                 )
1511             );
1512             $PAGE->renderPage('import');
1513             exit;
1514         }
1515
1516         // Import bookmarks from an uploaded file
1517         if (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size'] == 0) {
1518             // The file is too big or some form field may be missing.
1519             echo '<script>alert("The file you are trying to upload is probably'
1520                 .' bigger than what this webserver can accept ('
1521                 .get_max_upload_size(ini_get('post_max_size'), ini_get('upload_max_filesize')).').'
1522                 .' Please upload in smaller chunks.");document.location=\'?do='
1523                 .Router::$PAGE_IMPORT .'\';</script>';
1524             exit;
1525         }
1526         if (! tokenOk($_POST['token'])) {
1527             die('Wrong token.');
1528         }
1529         $status = NetscapeBookmarkUtils::import(
1530             $_POST,
1531             $_FILES,
1532             $LINKSDB,
1533             $conf,
1534             $history
1535         );
1536         echo '<script>alert("'.$status.'");document.location=\'?do='
1537              .Router::$PAGE_IMPORT .'\';</script>';
1538         exit;
1539     }
1540
1541     // Plugin administration page
1542     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1543         $pluginMeta = $pluginManager->getPluginsMeta();
1544
1545         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1546         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1547         // Load parameters.
1548         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $conf->get('plugins', array()));
1549         uasort(
1550             $enabledPlugins,
1551             function($a, $b) { return $a['order'] - $b['order']; }
1552         );
1553         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1554
1555         $PAGE->assign('enabledPlugins', $enabledPlugins);
1556         $PAGE->assign('disabledPlugins', $disabledPlugins);
1557         $PAGE->renderPage('pluginsadmin');
1558         exit;
1559     }
1560
1561     // Plugin administration form action
1562     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1563         try {
1564             if (isset($_POST['parameters_form'])) {
1565                 unset($_POST['parameters_form']);
1566                 foreach ($_POST as $param => $value) {
1567                     $conf->set('plugins.'. $param, escape($value));
1568                 }
1569             }
1570             else {
1571                 $conf->set('general.enabled_plugins', save_plugin_config($_POST));
1572             }
1573             $conf->write(isLoggedIn());
1574             $history->updateSettings();
1575         }
1576         catch (Exception $e) {
1577             error_log(
1578                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1579                 $e->getMessage()
1580             );
1581
1582             // TODO: do not handle exceptions/errors in JS.
1583             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do='. Router::$PAGE_PLUGINSADMIN .'\';</script>';
1584             exit;
1585         }
1586         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1587         exit;
1588     }
1589
1590     // Get a fresh token
1591     if ($targetPage == Router::$GET_TOKEN) {
1592         header('Content-Type:text/plain');
1593         echo getToken($conf);
1594         exit;
1595     }
1596
1597     // -------- Otherwise, simply display search form and links:
1598     showLinkList($PAGE, $LINKSDB, $conf, $pluginManager);
1599     exit;
1600 }
1601
1602 /**
1603  * Template for the list of links (<div id="linklist">)
1604  * This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1605  *
1606  * @param pageBuilder   $PAGE          pageBuilder instance.
1607  * @param LinkDB        $LINKSDB       LinkDB instance.
1608  * @param ConfigManager $conf          Configuration Manager instance.
1609  * @param PluginManager $pluginManager Plugin Manager instance.
1610  */
1611 function buildLinkList($PAGE,$LINKSDB, $conf, $pluginManager)
1612 {
1613     // Used in templates
1614     if (isset($_GET['searchtags'])) {
1615         if (! empty($_GET['searchtags'])) {
1616             $searchtags = escape(normalize_spaces($_GET['searchtags']));
1617         } else {
1618             $searchtags = false;
1619         }
1620     } else {
1621         $searchtags = '';
1622     }
1623     $searchterm = !empty($_GET['searchterm']) ? escape(normalize_spaces($_GET['searchterm'])) : '';
1624
1625     // Smallhash filter
1626     if (! empty($_SERVER['QUERY_STRING'])
1627         && preg_match('/^[a-zA-Z0-9-_@]{6}($|&|#)/', $_SERVER['QUERY_STRING'])) {
1628         try {
1629             $linksToDisplay = $LINKSDB->filterHash($_SERVER['QUERY_STRING']);
1630         } catch (LinkNotFoundException $e) {
1631             $PAGE->render404($e->getMessage());
1632             exit;
1633         }
1634     } else {
1635         // Filter links according search parameters.
1636         $visibility = ! empty($_SESSION['privateonly']) ? 'private' : 'all';
1637         $request = [
1638             'searchtags' => $searchtags,
1639             'searchterm' => $searchterm,
1640         ];
1641         $linksToDisplay = $LINKSDB->filterSearch($request, false, $visibility, !empty($_SESSION['untaggedonly']));
1642     }
1643
1644     // ---- Handle paging.
1645     $keys = array();
1646     foreach ($linksToDisplay as $key => $value) {
1647         $keys[] = $key;
1648     }
1649
1650
1651
1652     // Select articles according to paging.
1653     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1654     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1655     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1656     $page = $page < 1 ? 1 : $page;
1657     $page = $page > $pagecount ? $pagecount : $page;
1658     // Start index.
1659     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1660     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1661     $linkDisp = array();
1662     while ($i<$end && $i<count($keys))
1663     {
1664         $link = $linksToDisplay[$keys[$i]];
1665         $link['description'] = format_description($link['description'], $conf->get('redirector.url'));
1666         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
1667         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
1668         $link['timestamp'] = $link['created']->getTimestamp();
1669         if (! empty($link['updated'])) {
1670             $link['updated_timestamp'] = $link['updated']->getTimestamp();
1671         } else {
1672             $link['updated_timestamp'] = '';
1673         }
1674         $taglist = preg_split('/\s+/', $link['tags'], -1, PREG_SPLIT_NO_EMPTY);
1675         uasort($taglist, 'strcasecmp');
1676         $link['taglist'] = $taglist;
1677         // Check for both signs of a note: starting with ? and 7 chars long.
1678         if ($link['url'][0] === '?' &&
1679             strlen($link['url']) === 7) {
1680             $link['url'] = index_url($_SERVER) . $link['url'];
1681         }
1682
1683         $linkDisp[$keys[$i]] = $link;
1684         $i++;
1685     }
1686
1687     // Compute paging navigation
1688     $searchtagsUrl = $searchtags === '' ? '' : '&searchtags=' . urlencode($searchtags);
1689     $searchtermUrl = empty($searchterm) ? '' : '&searchterm=' . urlencode($searchterm);
1690     $previous_page_url = '';
1691     if ($i != count($keys)) {
1692         $previous_page_url = '?page=' . ($page+1) . $searchtermUrl . $searchtagsUrl;
1693     }
1694     $next_page_url='';
1695     if ($page>1) {
1696         $next_page_url = '?page=' . ($page-1) . $searchtermUrl . $searchtagsUrl;
1697     }
1698
1699     // Fill all template fields.
1700     $data = array(
1701         'previous_page_url' => $previous_page_url,
1702         'next_page_url' => $next_page_url,
1703         'page_current' => $page,
1704         'page_max' => $pagecount,
1705         'result_count' => count($linksToDisplay),
1706         'search_term' => $searchterm,
1707         'search_tags' => $searchtags,
1708         'visibility' => ! empty($_SESSION['privateonly']) ? 'private' : '',
1709         'redirector' => $conf->get('redirector.url'),  // Optional redirector URL.
1710         'links' => $linkDisp,
1711     );
1712
1713     // If there is only a single link, we change on-the-fly the title of the page.
1714     if (count($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 try {
2236     $history = new History($conf->get('resource.history'));
2237 } catch(Exception $e) {
2238     die($e->getMessage());
2239 }
2240
2241 $linkDb = new LinkDB(
2242     $conf->get('resource.datastore'),
2243     isLoggedIn(),
2244     $conf->get('privacy.hide_public_links'),
2245     $conf->get('redirector.url'),
2246     $conf->get('redirector.encode_url')
2247 );
2248
2249 $container = new \Slim\Container();
2250 $container['conf'] = $conf;
2251 $container['plugins'] = $pluginManager;
2252 $container['history'] = $history;
2253 $app = new \Slim\App($container);
2254
2255 // REST API routes
2256 $app->group('/api/v1', function() {
2257     $this->get('/info', '\Shaarli\Api\Controllers\Info:getInfo')->setName('getInfo');
2258     $this->get('/links', '\Shaarli\Api\Controllers\Links:getLinks')->setName('getLinks');
2259     $this->get('/links/{id:[\d]+}', '\Shaarli\Api\Controllers\Links:getLink')->setName('getLink');
2260     $this->post('/links', '\Shaarli\Api\Controllers\Links:postLink')->setName('postLink');
2261     $this->put('/links/{id:[\d]+}', '\Shaarli\Api\Controllers\Links:putLink')->setName('putLink');
2262     $this->delete('/links/{id:[\d]+}', '\Shaarli\Api\Controllers\Links:deleteLink')->setName('deleteLink');
2263     $this->get('/history', '\Shaarli\Api\Controllers\History:getHistory')->setName('getHistory');
2264 })->add('\Shaarli\Api\ApiMiddleware');
2265
2266 $response = $app->run(true);
2267 // Hack to make Slim and Shaarli router work together:
2268 // If a Slim route isn't found and NOT API call, we call renderPage().
2269 if ($response->getStatusCode() == 404 && strpos($_SERVER['REQUEST_URI'], '/api/v1') === false) {
2270     // We use UTF-8 for proper international characters handling.
2271     header('Content-Type: text/html; charset=utf-8');
2272     renderPage($conf, $pluginManager, $linkDb, $history);
2273 } else {
2274     $app->respond($response);
2275 }