index.php

   1 <?php
   2 /**
   3  * Shaarli v0.7.0 - Shaare your links...
   4  *
   5  * The personal, minimalist, super-fast, no-database Delicious clone.
   6  *
   7  * Friendly fork by the Shaarli community:
   8  *  - https://github.com/shaarli/Shaarli
   9  *
  10  * Original project by sebsauvage.net:
  11  *  - http://sebsauvage.net/wiki/doku.php?id=php:shaarli
  12  *  - https://github.com/sebsauvage/Shaarli
  13  *
  14  * Licence: http://www.opensource.org/licenses/zlib-license.php
  15  *
  16  * Requires: PHP 5.3.x
  17  */
  18
  19 // Set 'UTC' as the default timezone if it is not defined in php.ini
  20 // See http://php.net/manual/en/datetime.configuration.php#ini.date.timezone
  21 if (date_default_timezone_get() == '') {
  22     date_default_timezone_set('UTC');
  23 }
  24
  25 /*
  26  * PHP configuration
  27  */
  28 define('shaarli_version', '0.7.0');
  29
  30 // http://server.com/x/shaarli --> /shaarli/
  31 define('WEB_PATH', substr($_SERVER['REQUEST_URI'], 0, 1+strrpos($_SERVER['REQUEST_URI'], '/', 0)));
  32
  33 // High execution time in case of problematic imports/exports.
  34 ini_set('max_input_time','60');
  35
  36 // Try to set max upload file size and read
  37 ini_set('memory_limit', '128M');
  38 ini_set('post_max_size', '16M');
  39 ini_set('upload_max_filesize', '16M');
  40
  41 // See all error except warnings
  42 error_reporting(E_ALL^E_WARNING);
  43 // See all errors (for debugging only)
  44 //error_reporting(-1);
  45
  46
  47 // Shaarli library
  48 require_once 'application/ApplicationUtils.php';
  49 require_once 'application/Cache.php';
  50 require_once 'application/CachedPage.php';
  51 require_once 'application/FeedBuilder.php';
  52 require_once 'application/FileUtils.php';
  53 require_once 'application/HttpUtils.php';
  54 require_once 'application/LinkDB.php';
  55 require_once 'application/LinkFilter.php';
  56 require_once 'application/LinkUtils.php';
  57 require_once 'application/NetscapeBookmarkUtils.php';
  58 require_once 'application/PageBuilder.php';
  59 require_once 'application/TimeZone.php';
  60 require_once 'application/Url.php';
  61 require_once 'application/Utils.php';
  62 require_once 'application/config/ConfigManager.php';
  63 require_once 'application/config/ConfigPlugin.php';
  64 require_once 'application/PluginManager.php';
  65 require_once 'application/Router.php';
  66 require_once 'application/Updater.php';
  67 require_once 'inc/rain.tpl.class.php';
  68
  69 // Ensure the PHP version is supported
  70 try {
  71     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
  72 } catch(Exception $exc) {
  73     header('Content-Type: text/plain; charset=utf-8');
  74     echo $exc->getMessage();
  75     exit;
  76 }
  77
  78 // Force cookie path (but do not change lifetime)
  79 $cookie = session_get_cookie_params();
  80 $cookiedir = '';
  81 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
  82     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
  83 }
  84 // Set default cookie expiration and path.
  85 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
  86 // Set session parameters on server side.
  87 // If the user does not access any page within this time, his/her session is considered expired.
  88 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
  89 // Use cookies to store session.
  90 ini_set('session.use_cookies', 1);
  91 // Force cookies for session (phpsessionID forbidden in URL).
  92 ini_set('session.use_only_cookies', 1);
  93 // Prevent PHP form using sessionID in URL if cookies are disabled.
  94 ini_set('session.use_trans_sid', false);
  95
  96 session_name('shaarli');
  97 // Start session if needed (Some server auto-start sessions).
  98 if (session_id() == '') {
  99     session_start();
 100 }
 101
 102 // Regenerate session ID if invalid or not defined in cookie.
 103 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 104     session_regenerate_id(true);
 105     $_COOKIE['shaarli'] = session_id();
 106 }
 107
 108 $conf = ConfigManager::getInstance();
 109 $conf->setEmpty('general.timezone', date_default_timezone_get());
 110 $conf->setEmpty('general.title', 'Shared links on '. escape(index_url($_SERVER)));
 111 RainTPL::$tpl_dir = $conf->get('path.raintpl_tpl'); // template directory
 112 RainTPL::$cache_dir = $conf->get('path.raintpl_tmp'); // cache directory
 113
 114 $pluginManager = PluginManager::getInstance();
 115 $pluginManager->load($conf->get('general.enabled_plugins'));
 116
 117 date_default_timezone_set($conf->get('general.timezone', 'UTC'));
 118
 119 ob_start();  // Output buffering for the page cache.
 120
 121 // In case stupid admin has left magic_quotes enabled in php.ini:
 122 if (get_magic_quotes_gpc())
 123 {
 124     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 125     $_POST = array_map('stripslashes_deep', $_POST);
 126     $_GET = array_map('stripslashes_deep', $_GET);
 127     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 128 }
 129
 130 // Prevent caching on client side or proxy: (yes, it's ugly)
 131 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 132 header("Cache-Control: no-store, no-cache, must-revalidate");
 133 header("Cache-Control: post-check=0, pre-check=0", false);
 134 header("Pragma: no-cache");
 135
 136 if (! is_file($conf->getConfigFile())) {
 137     // Ensure Shaarli has proper access to its resources
 138     $errors = ApplicationUtils::checkResourcePermissions();
 139
 140     if ($errors != array()) {
 141         $message = '<p>Insufficient permissions:</p><ul>';
 142
 143         foreach ($errors as $error) {
 144             $message .= '<li>'.$error.'</li>';
 145         }
 146         $message .= '</ul>';
 147
 148         header('Content-Type: text/html; charset=utf-8');
 149         echo $message;
 150         exit;
 151     }
 152
 153     // Display the installation form if no existing config is found
 154     install();
 155 }
 156
 157 // a token depending of deployment salt, user password, and the current ip
 158 define('STAY_SIGNED_IN_TOKEN', sha1($conf->get('credentials.hash') . $_SERVER['REMOTE_ADDR'] . $conf->get('credentials.salt')));
 159
 160 // Sniff browser language and set date format accordingly.
 161 if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
 162     autoLocale($_SERVER['HTTP_ACCEPT_LANGUAGE']);
 163 }
 164 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 165
 166 //==================================================================================================
 167 // Checking session state (i.e. is the user still logged in)
 168 //==================================================================================================
 169
 170 function setup_login_state() {
 171     $conf = ConfigManager::getInstance();
 172
 173         if ($conf->get('extras.open_shaarli')) {
 174             return true;
 175         }
 176         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 177         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 178         if (! $conf->exists('credentials.login')) {
 179             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 180             $loginFailure = true;
 181         }
 182         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 183             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 184             !$loginFailure)
 185         {
 186             fillSessionInfo();
 187             $userIsLoggedIn = true;
 188         }
 189         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 190         if (empty($_SESSION['uid'])
 191         || ($conf->get('security.session_protection_disabled') == false && $_SESSION['ip'] != allIPs())
 192         || time() >= $_SESSION['expires_on'])
 193         {
 194             logout();
 195             $userIsLoggedIn = false;
 196             $loginFailure = true;
 197         }
 198         if (!empty($_SESSION['longlastingsession'])) {
 199             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 200         }
 201         else {
 202             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 203         }
 204         if (!$loginFailure) {
 205             $userIsLoggedIn = true;
 206         }
 207
 208         return $userIsLoggedIn;
 209 }
 210 $userIsLoggedIn = setup_login_state();
 211
 212 // ------------------------------------------------------------------------------------------
 213 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 214 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 215 function pubsubhub()
 216 {
 217     $conf = ConfigManager::getInstance();
 218     $pshUrl = $conf->get('config.PUBSUBHUB_URL');
 219     if (!empty($pshUrl))
 220     {
 221         include_once './publisher.php';
 222         $p = new Publisher($pshUrl);
 223         $topic_url = array (
 224             index_url($_SERVER).'?do=atom',
 225             index_url($_SERVER).'?do=rss'
 226         );
 227         $p->publish_update($topic_url);
 228     }
 229 }
 230
 231 // ------------------------------------------------------------------------------------------
 232 // Session management
 233
 234 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 235 function allIPs()
 236 {
 237     $ip = $_SERVER['REMOTE_ADDR'];
 238     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 239     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 240     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 241     return $ip;
 242 }
 243
 244 function fillSessionInfo() {
 245     $conf = ConfigManager::getInstance();
 246         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 247         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 248         $_SESSION['username']= $conf->get('credentials.login');
 249         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 250 }
 251
 252 // Check that user/password is correct.
 253 function check_auth($login,$password)
 254 {
 255     $conf = ConfigManager::getInstance();
 256     $hash = sha1($password . $login . $conf->get('credentials.salt'));
 257     if ($login == $conf->get('credentials.login') && $hash == $conf->get('credentials.hash'))
 258     {   // Login/password is correct.
 259                 fillSessionInfo();
 260         logm($conf->get('path.log'), $_SERVER['REMOTE_ADDR'], 'Login successful');
 261         return True;
 262     }
 263     logm($conf->get('path.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     }
 282     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 283 }
 284
 285
 286 // ------------------------------------------------------------------------------------------
 287 // Brute force protection system
 288 // Several consecutive failed logins will ban the IP address for 30 minutes.
 289 if (!is_file($conf->get('path.ban_file', 'data/ipbans.php'))) {
 290     // FIXME! globals
 291     file_put_contents(
 292         $conf->get('path.ban_file', 'data/ipbans.php'),
 293         "<?php\n\$GLOBALS['IPBANS']=".var_export(array('FAILURES'=>array(),'BANS'=>array()),true).";\n?>"
 294     );
 295 }
 296 include $conf->get('path.ban_file', 'data/ipbans.php');
 297 // Signal a failed login. Will ban the IP if too many failures:
 298 function ban_loginFailed()
 299 {
 300     $conf = ConfigManager::getInstance();
 301     $ip = $_SERVER['REMOTE_ADDR'];
 302     $gb = $GLOBALS['IPBANS'];
 303     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 304     $gb['FAILURES'][$ip]++;
 305     if ($gb['FAILURES'][$ip] > ($conf->get('security.ban_after') - 1))
 306     {
 307         $gb['BANS'][$ip] = time() + $conf->get('security.ban_after', 1800);
 308         logm($conf->get('path.log'), $_SERVER['REMOTE_ADDR'], 'IP address banned from login');
 309     }
 310     $GLOBALS['IPBANS'] = $gb;
 311     file_put_contents(
 312         $conf->get('path.ban_file', 'data/ipbans.php'),
 313         "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 314     );
 315 }
 316
 317 // Signals a successful login. Resets failed login counter.
 318 function ban_loginOk()
 319 {
 320     $conf = ConfigManager::getInstance();
 321     $ip = $_SERVER['REMOTE_ADDR'];
 322     $gb = $GLOBALS['IPBANS'];
 323     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 324     $GLOBALS['IPBANS'] = $gb;
 325     file_put_contents(
 326         $conf->get('path.ban_file', 'data/ipbans.php'),
 327         "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 328     );
 329 }
 330
 331 // Checks if the user CAN login. If 'true', the user can try to login.
 332 function ban_canLogin()
 333 {
 334     $conf = ConfigManager::getInstance();
 335     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 336     if (isset($gb['BANS'][$ip]))
 337     {
 338         // User is banned. Check if the ban has expired:
 339         if ($gb['BANS'][$ip]<=time())
 340         {   // Ban expired, user can try to login again.
 341             logm($conf->get('path.log'), $_SERVER['REMOTE_ADDR'], 'Ban lifted.');
 342             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 343             file_put_contents(
 344                 $conf->get('path.ban_file', 'data/ipbans.php'),
 345                 "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 346             );
 347             return true; // Ban has expired, user can login.
 348         }
 349         return false; // User is banned.
 350     }
 351     return true; // User is not banned.
 352 }
 353
 354 // ------------------------------------------------------------------------------------------
 355 // Process login form: Check if login/password is correct.
 356 if (isset($_POST['login']))
 357 {
 358     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 359     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 360     {   // Login/password is OK.
 361         ban_loginOk();
 362         // If user wants to keep the session cookie even after the browser closes:
 363         if (!empty($_POST['longlastingsession']))
 364         {
 365                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 366             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 367             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 368
 369             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 370             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 371             // Note: Never forget the trailing slash on the cookie path!
 372             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 373         }
 374         else // Standard session expiration (=when browser closes)
 375         {
 376             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 377             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 378             session_regenerate_id(true);
 379         }
 380
 381         // Optional redirect after login:
 382         if (isset($_GET['post'])) {
 383             $uri = '?post='. urlencode($_GET['post']);
 384             foreach (array('description', 'source', 'title') as $param) {
 385                 if (!empty($_GET[$param])) {
 386                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 387                 }
 388             }
 389             header('Location: '. $uri);
 390             exit;
 391         }
 392
 393         if (isset($_GET['edit_link'])) {
 394             header('Location: ?edit_link='. escape($_GET['edit_link']));
 395             exit;
 396         }
 397
 398         if (isset($_POST['returnurl'])) {
 399             // Prevent loops over login screen.
 400             if (strpos($_POST['returnurl'], 'do=login') === false) {
 401                 header('Location: '. generateLocation($_POST['returnurl'], $_SERVER['HTTP_HOST']));
 402                 exit;
 403             }
 404         }
 405         header('Location: ?'); exit;
 406     }
 407     else
 408     {
 409         ban_loginFailed();
 410         $redir = '&username='. $_POST['login'];
 411         if (isset($_GET['post'])) {
 412             $redir .= '&post=' . urlencode($_GET['post']);
 413             foreach (array('description', 'source', 'title') as $param) {
 414                 if (!empty($_GET[$param])) {
 415                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 416                 }
 417             }
 418         }
 419         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 420         exit;
 421     }
 422 }
 423
 424 // ------------------------------------------------------------------------------------------
 425 // Misc utility functions:
 426
 427 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 428 function return_bytes($val)
 429 {
 430     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 431     switch($last)
 432     {
 433         case 'g': $val *= 1024;
 434         case 'm': $val *= 1024;
 435         case 'k': $val *= 1024;
 436     }
 437     return $val;
 438 }
 439
 440 // Try to determine max file size for uploads (POST).
 441 // Returns an integer (in bytes)
 442 function getMaxFileSize()
 443 {
 444     $size1 = return_bytes(ini_get('post_max_size'));
 445     $size2 = return_bytes(ini_get('upload_max_filesize'));
 446     // Return the smaller of two:
 447     $maxsize = min($size1,$size2);
 448     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 449     return $maxsize;
 450 }
 451
 452 // ------------------------------------------------------------------------------------------
 453 // Token management for XSRF protection
 454 // Token should be used in any form which acts on data (create,update,delete,import...).
 455 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 456
 457 // Returns a token.
 458 function getToken()
 459 {
 460     $conf = ConfigManager::getInstance();
 461     $rnd = sha1(uniqid('', true) .'_'. mt_rand() . $conf->get('credentials.salt'));  // We generate a random string.
 462     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 463     return $rnd;
 464 }
 465
 466 // Tells if a token is OK. Using this function will destroy the token.
 467 // true=token is OK.
 468 function tokenOk($token)
 469 {
 470     if (isset($_SESSION['tokens'][$token]))
 471     {
 472         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 473         return true; // Token is OK.
 474     }
 475     return false; // Wrong token, or already used.
 476 }
 477
 478 // ------------------------------------------------------------------------------------------
 479 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 480 // Gives the last 7 days (which have links).
 481 // This RSS feed cannot be filtered.
 482 function showDailyRSS() {
 483     $conf = ConfigManager::getInstance();
 484     // Cache system
 485     $query = $_SERVER['QUERY_STRING'];
 486     $cache = new CachedPage(
 487         $conf->get('config.PAGE_CACHE'),
 488         page_url($_SERVER),
 489         startsWith($query,'do=dailyrss') && !isLoggedIn()
 490     );
 491     $cached = $cache->cachedVersion();
 492     if (!empty($cached)) {
 493         echo $cached;
 494         exit;
 495     }
 496
 497     // If cached was not found (or not usable), then read the database and build the response:
 498     // Read links from database (and filter private links if used it not logged in).
 499     $LINKSDB = new LinkDB(
 500         $conf->get('path.datastore'),
 501         isLoggedIn(),
 502         $conf->get('extras.hide_public_links'),
 503         $conf->get('extras.redirector'),
 504         $conf->get('extras.redirector_encode_url')
 505     );
 506
 507     /* Some Shaarlies may have very few links, so we need to look
 508        back in time (rsort()) until we have enough days ($nb_of_days).
 509     */
 510     $linkdates = array();
 511     foreach ($LINKSDB as $linkdate => $value) {
 512         $linkdates[] = $linkdate;
 513     }
 514     rsort($linkdates);
 515     $nb_of_days = 7; // We take 7 days.
 516     $today = date('Ymd');
 517     $days = array();
 518
 519     foreach ($linkdates as $linkdate) {
 520         $day = substr($linkdate, 0, 8); // Extract day (without time)
 521         if (strcmp($day,$today) < 0) {
 522             if (empty($days[$day])) {
 523                 $days[$day] = array();
 524             }
 525             $days[$day][] = $linkdate;
 526         }
 527
 528         if (count($days) > $nb_of_days) {
 529             break; // Have we collected enough days?
 530         }
 531     }
 532
 533     // Build the RSS feed.
 534     header('Content-Type: application/rss+xml; charset=utf-8');
 535     $pageaddr = escape(index_url($_SERVER));
 536     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 537     echo '<channel>';
 538     echo '<title>Daily - '. $conf->get('general.title') . '</title>';
 539     echo '<link>'. $pageaddr .'</link>';
 540     echo '<description>Daily shared links</description>';
 541     echo '<language>en-en</language>';
 542     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 543
 544     // For each day.
 545     foreach ($days as $day => $linkdates) {
 546         $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 547         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 548
 549         // Build the HTML body of this RSS entry.
 550         $html = '';
 551         $href = '';
 552         $links = array();
 553
 554         // We pre-format some fields for proper output.
 555         foreach ($linkdates as $linkdate) {
 556             $l = $LINKSDB[$linkdate];
 557             $l['formatedDescription'] = format_description($l['description'], $conf->get('extras.redirector'));
 558             $l['thumbnail'] = thumbnail($l['url']);
 559             $l_date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $l['linkdate']);
 560             $l['timestamp'] = $l_date->getTimestamp();
 561             if (startsWith($l['url'], '?')) {
 562                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 563             }
 564             $links[$linkdate] = $l;
 565         }
 566
 567         // Then build the HTML for this day:
 568         $tpl = new RainTPL;
 569         $tpl->assign('title', $conf->get('general.title'));
 570         $tpl->assign('daydate', $dayDate->getTimestamp());
 571         $tpl->assign('absurl', $absurl);
 572         $tpl->assign('links', $links);
 573         $tpl->assign('rssdate', escape($dayDate->format(DateTime::RSS)));
 574         $tpl->assign('hide_timestamps', $conf->get('extras.hide_timestamps', false));
 575         $html = $tpl->draw('dailyrss', $return_string=true);
 576
 577         echo $html . PHP_EOL;
 578     }
 579     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
 580
 581     $cache->cache(ob_get_contents());
 582     ob_end_flush();
 583     exit;
 584 }
 585
 586 /**
 587  * Show the 'Daily' page.
 588  *
 589  * @param PageBuilder $pageBuilder Template engine wrapper.
 590  * @param LinkDB $LINKSDB LinkDB instance.
 591  */
 592 function showDaily($pageBuilder, $LINKSDB)
 593 {
 594     $conf = ConfigManager::getInstance();
 595     $day=date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 596     if (isset($_GET['day'])) $day=$_GET['day'];
 597
 598     $days = $LINKSDB->days();
 599     $i = array_search($day,$days);
 600     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
 601     $previousday='';
 602     $nextday='';
 603     if ($i!==false)
 604     {
 605         if ($i>=1) $previousday=$days[$i-1];
 606         if ($i<count($days)-1) $nextday=$days[$i+1];
 607     }
 608
 609     try {
 610         $linksToDisplay = $LINKSDB->filterDay($day);
 611     } catch (Exception $exc) {
 612         error_log($exc);
 613         $linksToDisplay = array();
 614     }
 615
 616     // We pre-format some fields for proper output.
 617     foreach($linksToDisplay as $key=>$link)
 618     {
 619
 620         $taglist = explode(' ',$link['tags']);
 621         uasort($taglist, 'strcasecmp');
 622         $linksToDisplay[$key]['taglist']=$taglist;
 623         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $conf->get('extras.redirector'));
 624         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
 625         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
 626         $linksToDisplay[$key]['timestamp'] = $date->getTimestamp();
 627     }
 628
 629     /* We need to spread the articles on 3 columns.
 630        I did not want to use a JavaScript lib like http://masonry.desandro.com/
 631        so I manually spread entries with a simple method: I roughly evaluate the
 632        height of a div according to title and description length.
 633     */
 634     $columns=array(array(),array(),array()); // Entries to display, for each column.
 635     $fill=array(0,0,0);  // Rough estimate of columns fill.
 636     foreach($linksToDisplay as $key=>$link)
 637     {
 638         // Roughly estimate length of entry (by counting characters)
 639         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
 640         // Description: 836 characters gives roughly 342 pixel height.
 641         // This is not perfect, but it's usually OK.
 642         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
 643         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
 644         // Then put in column which is the less filled:
 645         $smallest=min($fill); // find smallest value in array.
 646         $index=array_search($smallest,$fill); // find index of this smallest value.
 647         array_push($columns[$index],$link); // Put entry in this column.
 648         $fill[$index]+=$length;
 649     }
 650
 651     $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 652     $data = array(
 653         'linksToDisplay' => $linksToDisplay,
 654         'cols' => $columns,
 655         'day' => $dayDate->getTimestamp(),
 656         'previousday' => $previousday,
 657         'nextday' => $nextday,
 658     );
 659     $pluginManager = PluginManager::getInstance();
 660     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
 661
 662     foreach ($data as $key => $value) {
 663         $pageBuilder->assign($key, $value);
 664     }
 665
 666     $pageBuilder->renderPage('daily');
 667     exit;
 668 }
 669
 670 // Renders the linklist
 671 function showLinkList($PAGE, $LINKSDB) {
 672     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
 673     $PAGE->renderPage('linklist');
 674 }
 675
 676
 677 // ------------------------------------------------------------------------------------------
 678 // Render HTML page (according to URL parameters and user rights)
 679 function renderPage()
 680 {
 681     $conf = ConfigManager::getInstance();
 682     $LINKSDB = new LinkDB(
 683         $conf->get('path.datastore'),
 684         isLoggedIn(),
 685         $conf->get('extras.hide_public_links'),
 686         $conf->get('extras.redirector'),
 687         $conf->get('extras.redirector_encode_url')
 688     );
 689
 690     $updater = new Updater(
 691         read_updates_file($conf->get('path.updates')),
 692         $LINKSDB,
 693         isLoggedIn()
 694     );
 695     try {
 696         $newUpdates = $updater->update();
 697         if (! empty($newUpdates)) {
 698             write_updates_file(
 699                 $conf->get('path.updates'),
 700                 $updater->getDoneUpdates()
 701             );
 702         }
 703     }
 704     catch(Exception $e) {
 705         die($e->getMessage());
 706     }
 707
 708     $PAGE = new PageBuilder();
 709     $PAGE->assign('linkcount', count($LINKSDB));
 710     $PAGE->assign('privateLinkcount', count_private($LINKSDB));
 711
 712     // Determine which page will be rendered.
 713     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
 714     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
 715
 716     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
 717     // Then assign generated data to RainTPL.
 718     $common_hooks = array(
 719         'includes',
 720         'header',
 721         'footer',
 722     );
 723     $pluginManager = PluginManager::getInstance();
 724     foreach($common_hooks as $name) {
 725         $plugin_data = array();
 726         $pluginManager->executeHooks('render_' . $name, $plugin_data,
 727             array(
 728                 'target' => $targetPage,
 729                 'loggedin' => isLoggedIn()
 730             )
 731         );
 732         $PAGE->assign('plugins_' . $name, $plugin_data);
 733     }
 734
 735     // -------- Display login form.
 736     if ($targetPage == Router::$PAGE_LOGIN)
 737     {
 738         if ($conf->get('extras.open_shaarli')) { header('Location: ?'); exit; }  // No need to login for open Shaarli
 739         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
 740         $PAGE->assign('token',$token);
 741         if (isset($_GET['username'])) {
 742             $PAGE->assign('username', escape($_GET['username']));
 743         }
 744         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
 745         $PAGE->renderPage('loginform');
 746         exit;
 747     }
 748     // -------- User wants to logout.
 749     if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=logout'))
 750     {
 751         invalidateCaches($conf->get('path.page_cache'));
 752         logout();
 753         header('Location: ?');
 754         exit;
 755     }
 756
 757     // -------- Picture wall
 758     if ($targetPage == Router::$PAGE_PICWALL)
 759     {
 760         // Optionally filter the results:
 761         $links = $LINKSDB->filterSearch($_GET);
 762         $linksToDisplay = array();
 763
 764         // Get only links which have a thumbnail.
 765         foreach($links as $link)
 766         {
 767             $permalink='?'.escape(smallhash($link['linkdate']));
 768             $thumb=lazyThumbnail($link['url'],$permalink);
 769             if ($thumb!='') // Only output links which have a thumbnail.
 770             {
 771                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
 772                 $linksToDisplay[]=$link; // Add to array.
 773             }
 774         }
 775
 776         $data = array(
 777             'linksToDisplay' => $linksToDisplay,
 778         );
 779         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
 780
 781         foreach ($data as $key => $value) {
 782             $PAGE->assign($key, $value);
 783         }
 784
 785         $PAGE->renderPage('picwall');
 786         exit;
 787     }
 788
 789     // -------- Tag cloud
 790     if ($targetPage == Router::$PAGE_TAGCLOUD)
 791     {
 792         $tags= $LINKSDB->allTags();
 793
 794         // We sort tags alphabetically, then choose a font size according to count.
 795         // First, find max value.
 796         $maxcount = 0;
 797         foreach ($tags as $value) {
 798             $maxcount = max($maxcount, $value);
 799         }
 800
 801         // Sort tags alphabetically: case insensitive, support locale if avalaible.
 802         uksort($tags, function($a, $b) {
 803             // Collator is part of PHP intl.
 804             if (class_exists('Collator')) {
 805                 $c = new Collator(setlocale(LC_COLLATE, 0));
 806                 if (!intl_is_failure(intl_get_error_code())) {
 807                     return $c->compare($a, $b);
 808                 }
 809             }
 810             return strcasecmp($a, $b);
 811         });
 812
 813         $tagList = array();
 814         foreach($tags as $key => $value) {
 815             // Tag font size scaling:
 816             //   default 15 and 30 logarithm bases affect scaling,
 817             //   22 and 6 are arbitrary font sizes for max and min sizes.
 818             $size = log($value, 15) / log($maxcount, 30) * 2.2 + 0.8;
 819             $tagList[$key] = array(
 820                 'count' => $value,
 821                 'size' => number_format($size, 2, '.', ''),
 822             );
 823         }
 824
 825         $data = array(
 826             'tags' => $tagList,
 827         );
 828         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
 829
 830         foreach ($data as $key => $value) {
 831             $PAGE->assign($key, $value);
 832         }
 833
 834         $PAGE->renderPage('tagcloud');
 835         exit;
 836     }
 837
 838     // Daily page.
 839     if ($targetPage == Router::$PAGE_DAILY) {
 840         showDaily($PAGE, $LINKSDB);
 841     }
 842
 843     // ATOM and RSS feed.
 844     if ($targetPage == Router::$PAGE_FEED_ATOM || $targetPage == Router::$PAGE_FEED_RSS) {
 845         $feedType = $targetPage == Router::$PAGE_FEED_RSS ? FeedBuilder::$FEED_RSS : FeedBuilder::$FEED_ATOM;
 846         header('Content-Type: application/'. $feedType .'+xml; charset=utf-8');
 847
 848         // Cache system
 849         $query = $_SERVER['QUERY_STRING'];
 850         $cache = new CachedPage(
 851             $conf->get('path.page_cache'),
 852             page_url($_SERVER),
 853             startsWith($query,'do='. $targetPage) && !isLoggedIn()
 854         );
 855         $cached = $cache->cachedVersion();
 856         if (!empty($cached)) {
 857             echo $cached;
 858             exit;
 859         }
 860
 861         // Generate data.
 862         $feedGenerator = new FeedBuilder($LINKSDB, $feedType, $_SERVER, $_GET, isLoggedIn());
 863         $feedGenerator->setLocale(strtolower(setlocale(LC_COLLATE, 0)));
 864         $feedGenerator->setHideDates($conf->get('extras.hide_timestamps') && !isLoggedIn());
 865         $feedGenerator->setUsePermalinks(isset($_GET['permalinks']) || !$conf->get('general.rss_permalinks'));
 866         $pshUrl = $conf->get('config.PUBSUBHUB_URL');
 867         if (!empty($pshUrl)) {
 868             $feedGenerator->setPubsubhubUrl($pshUrl);
 869         }
 870         $data = $feedGenerator->buildData();
 871
 872         // Process plugin hook.
 873         $pluginManager = PluginManager::getInstance();
 874         $pluginManager->executeHooks('render_feed', $data, array(
 875             'loggedin' => isLoggedIn(),
 876             'target' => $targetPage,
 877         ));
 878
 879         // Render the template.
 880         $PAGE->assignAll($data);
 881         $PAGE->renderPage('feed.'. $feedType);
 882         $cache->cache(ob_get_contents());
 883         ob_end_flush();
 884         exit;
 885     }
 886
 887     // Display openseach plugin (XML)
 888     if ($targetPage == Router::$PAGE_OPENSEARCH) {
 889         header('Content-Type: application/xml; charset=utf-8');
 890         $PAGE->assign('serverurl', index_url($_SERVER));
 891         $PAGE->renderPage('opensearch');
 892         exit;
 893     }
 894
 895     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
 896     if (isset($_GET['addtag']))
 897     {
 898         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
 899         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
 900         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
 901
 902         // Prevent redirection loop
 903         if (isset($params['addtag'])) {
 904             unset($params['addtag']);
 905         }
 906
 907         // Check if this tag is already in the search query and ignore it if it is.
 908         // Each tag is always separated by a space
 909         if (isset($params['searchtags'])) {
 910             $current_tags = explode(' ', $params['searchtags']);
 911         } else {
 912             $current_tags = array();
 913         }
 914         $addtag = true;
 915         foreach ($current_tags as $value) {
 916             if ($value === $_GET['addtag']) {
 917                 $addtag = false;
 918                 break;
 919             }
 920         }
 921         // Append the tag if necessary
 922         if (empty($params['searchtags'])) {
 923             $params['searchtags'] = trim($_GET['addtag']);
 924         }
 925         else if ($addtag) {
 926             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
 927         }
 928
 929         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
 930         header('Location: ?'.http_build_query($params));
 931         exit;
 932     }
 933
 934     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
 935     if (isset($_GET['removetag'])) {
 936         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
 937         if (empty($_SERVER['HTTP_REFERER'])) {
 938             header('Location: ?');
 939             exit;
 940         }
 941
 942         // In case browser does not send HTTP_REFERER
 943         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
 944
 945         // Prevent redirection loop
 946         if (isset($params['removetag'])) {
 947             unset($params['removetag']);
 948         }
 949
 950         if (isset($params['searchtags'])) {
 951             $tags = explode(' ', $params['searchtags']);
 952             // Remove value from array $tags.
 953             $tags = array_diff($tags, array($_GET['removetag']));
 954             $params['searchtags'] = implode(' ',$tags);
 955
 956             if (empty($params['searchtags'])) {
 957                 unset($params['searchtags']);
 958             }
 959
 960             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
 961         }
 962         header('Location: ?'.http_build_query($params));
 963         exit;
 964     }
 965
 966     // -------- User wants to change the number of links per page (linksperpage=...)
 967     if (isset($_GET['linksperpage'])) {
 968         if (is_numeric($_GET['linksperpage'])) {
 969             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
 970         }
 971
 972         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
 973         exit;
 974     }
 975
 976     // -------- User wants to see only private links (toggle)
 977     if (isset($_GET['privateonly'])) {
 978         if (empty($_SESSION['privateonly'])) {
 979             $_SESSION['privateonly'] = 1; // See only private links
 980         } else {
 981             unset($_SESSION['privateonly']); // See all links
 982         }
 983
 984         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
 985         exit;
 986     }
 987
 988     // -------- Handle other actions allowed for non-logged in users:
 989     if (!isLoggedIn())
 990     {
 991         // User tries to post new link but is not logged in:
 992         // Show login screen, then redirect to ?post=...
 993         if (isset($_GET['post']))
 994         {
 995             header('Location: ?do=login&post='.urlencode($_GET['post']).(!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').(!empty($_GET['description'])?'&description='.urlencode($_GET['description']):'').(!empty($_GET['source'])?'&source='.urlencode($_GET['source']):'')); // Redirect to login page, then back to post link.
 996             exit;
 997         }
 998
 999         showLinkList($PAGE, $LINKSDB);
1000         if (isset($_GET['edit_link'])) {
1001             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1002             exit;
1003         }
1004
1005         exit; // Never remove this one! All operations below are reserved for logged in user.
1006     }
1007
1008     // -------- All other functions are reserved for the registered user:
1009
1010     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1011     if ($targetPage == Router::$PAGE_TOOLS)
1012     {
1013         $data = array(
1014             'pageabsaddr' => index_url($_SERVER),
1015         );
1016         $pluginManager->executeHooks('render_tools', $data);
1017
1018         foreach ($data as $key => $value) {
1019             $PAGE->assign($key, $value);
1020         }
1021
1022         $PAGE->renderPage('tools');
1023         exit;
1024     }
1025
1026     // -------- User wants to change his/her password.
1027     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1028     {
1029         if ($conf->get('extras.open_shaarli')) {
1030             die('You are not supposed to change a password on an Open Shaarli.');
1031         }
1032
1033         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1034         {
1035             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1036
1037             // Make sure old password is correct.
1038             $oldhash = sha1($_POST['oldpassword'].$conf->get('credentials.login').$conf->get('credentials.salt'));
1039             if ($oldhash!= $conf->get('credentials.hash')) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1040             // Save new password
1041             // Salt renders rainbow-tables attacks useless.
1042             $conf->set('credentials.salt', sha1(uniqid('', true) .'_'. mt_rand()));
1043             $conf->set('credentials.hash', sha1($_POST['setpassword'] . $conf->get('credentials.login') . $conf->get('credentials.salt')));
1044             try {
1045                 $conf->write(isLoggedIn());
1046             }
1047             catch(Exception $e) {
1048                 error_log(
1049                     'ERROR while writing config file after changing password.' . PHP_EOL .
1050                     $e->getMessage()
1051                 );
1052
1053                 // TODO: do not handle exceptions/errors in JS.
1054                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1055                 exit;
1056             }
1057             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1058             exit;
1059         }
1060         else // show the change password form.
1061         {
1062             $PAGE->assign('token',getToken());
1063             $PAGE->renderPage('changepassword');
1064             exit;
1065         }
1066     }
1067
1068     // -------- User wants to change configuration
1069     if ($targetPage == Router::$PAGE_CONFIGURE)
1070     {
1071         if (!empty($_POST['title']) )
1072         {
1073             if (!tokenOk($_POST['token'])) {
1074                 die('Wrong token.'); // Go away!
1075             }
1076             $tz = 'UTC';
1077             if (!empty($_POST['continent']) && !empty($_POST['city'])
1078                 && isTimeZoneValid($_POST['continent'], $_POST['city'])
1079             ) {
1080                 $tz = $_POST['continent'] . '/' . $_POST['city'];
1081             }
1082             $conf->set('general.timezone', $tz);
1083             $conf->set('general.title', escape($_POST['title']));
1084             $conf->set('general.header_link', escape($_POST['titleLink']));
1085             $conf->set('extras.redirector', escape($_POST['redirector']));
1086             $conf->set('security.session_protection_disabled', !empty($_POST['disablesessionprotection']));
1087             $conf->set('general.default_private_links', !empty($_POST['privateLinkByDefault']));
1088             $conf->set('general.rss_permalinks', !empty($_POST['enableRssPermalinks']));
1089             $conf->set('general.check_updates', !empty($_POST['updateCheck']));
1090             $conf->set('extras.hide_public_links', !empty($_POST['hidePublicLinks']));
1091             try {
1092                 $conf->write(isLoggedIn());
1093             }
1094             catch(Exception $e) {
1095                 error_log(
1096                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1097                     $e->getMessage()
1098                 );
1099
1100                 // TODO: do not handle exceptions/errors in JS.
1101                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=configure\';</script>';
1102                 exit;
1103             }
1104             echo '<script>alert("Configuration was saved.");document.location=\'?do=configure\';</script>';
1105             exit;
1106         }
1107         else // Show the configuration form.
1108         {
1109             $PAGE->assign('token',getToken());
1110             $PAGE->assign('title', $conf->get('general.title'));
1111             $PAGE->assign('redirector', $conf->get('extras.redirector'));
1112             list($timezone_form, $timezone_js) = generateTimeZoneForm($conf->get('general.timezone'));
1113             $PAGE->assign('timezone_form', $timezone_form);
1114             $PAGE->assign('timezone_js',$timezone_js);
1115             $PAGE->assign('private_links_default', $conf->get('general.default_private_links', false));
1116             $PAGE->assign('enable_rss_permalinks', $conf->get('general.rss_permalinks', false));
1117             $PAGE->assign('enable_update_check', $conf->get('general.check_updates', true));
1118             $PAGE->assign('hide_public_links', $conf->get('extras.hide_public_links', false));
1119             $PAGE->renderPage('configure');
1120             exit;
1121         }
1122     }
1123
1124     // -------- User wants to rename a tag or delete it
1125     if ($targetPage == Router::$PAGE_CHANGETAG)
1126     {
1127         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1128             $PAGE->assign('token', getToken());
1129             $PAGE->assign('tags', $LINKSDB->allTags());
1130             $PAGE->renderPage('changetag');
1131             exit;
1132         }
1133
1134         if (!tokenOk($_POST['token'])) {
1135             die('Wrong token.');
1136         }
1137
1138         // Delete a tag:
1139         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1140             $needle = trim($_POST['fromtag']);
1141             // True for case-sensitive tag search.
1142             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1143             foreach($linksToAlter as $key=>$value)
1144             {
1145                 $tags = explode(' ',trim($value['tags']));
1146                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1147                 $value['tags']=trim(implode(' ',$tags));
1148                 $LINKSDB[$key]=$value;
1149             }
1150             $LINKSDB->savedb($conf->get('path.page_cache'));
1151             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1152             exit;
1153         }
1154
1155         // Rename a tag:
1156         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1157             $needle = trim($_POST['fromtag']);
1158             // True for case-sensitive tag search.
1159             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1160             foreach($linksToAlter as $key=>$value)
1161             {
1162                 $tags = explode(' ',trim($value['tags']));
1163                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1164                 $value['tags']=trim(implode(' ',$tags));
1165                 $LINKSDB[$key]=$value;
1166             }
1167             $LINKSDB->savedb($conf->get('path.page_cache')); // Save to disk.
1168             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1169             exit;
1170         }
1171     }
1172
1173     // -------- User wants to add a link without using the bookmarklet: Show form.
1174     if ($targetPage == Router::$PAGE_ADDLINK)
1175     {
1176         $PAGE->renderPage('addlink');
1177         exit;
1178     }
1179
1180     // -------- User clicked the "Save" button when editing a link: Save link to database.
1181     if (isset($_POST['save_edit']))
1182     {
1183         // Go away!
1184         if (! tokenOk($_POST['token'])) {
1185             die('Wrong token.');
1186         }
1187         // Remove multiple spaces.
1188         $tags = trim(preg_replace('/\s\s+/', ' ', $_POST['lf_tags']));
1189         // Remove first '-' char in tags.
1190         $tags = preg_replace('/(^| )\-/', '$1', $tags);
1191         // Remove duplicates.
1192         $tags = implode(' ', array_unique(explode(' ', $tags)));
1193         $linkdate = $_POST['lf_linkdate'];
1194         $url = trim($_POST['lf_url']);
1195         if (! startsWith($url, 'http:') && ! startsWith($url, 'https:')
1196             && ! startsWith($url, 'ftp:') && ! startsWith($url, 'magnet:')
1197             && ! startsWith($url, '?') && ! startsWith($url, 'javascript:')
1198         ) {
1199             $url = 'http://' . $url;
1200         }
1201
1202         $link = array(
1203             'title' => trim($_POST['lf_title']),
1204             'url' => $url,
1205             'description' => $_POST['lf_description'],
1206             'private' => (isset($_POST['lf_private']) ? 1 : 0),
1207             'linkdate' => $linkdate,
1208             'tags' => str_replace(',', ' ', $tags)
1209         );
1210         // If title is empty, use the URL as title.
1211         if ($link['title'] == '') {
1212             $link['title'] = $link['url'];
1213         }
1214
1215         $pluginManager->executeHooks('save_link', $link);
1216
1217         $LINKSDB[$linkdate] = $link;
1218         $LINKSDB->savedb($conf->get('path.page_cache'));
1219         pubsubhub();
1220
1221         // If we are called from the bookmarklet, we must close the popup:
1222         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1223             echo '<script>self.close();</script>';
1224             exit;
1225         }
1226
1227         $returnurl = !empty($_POST['returnurl']) ? $_POST['returnurl'] : '?';
1228         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1229         // Scroll to the link which has been edited.
1230         $location .= '#' . smallHash($_POST['lf_linkdate']);
1231         // After saving the link, redirect to the page the user was on.
1232         header('Location: '. $location);
1233         exit;
1234     }
1235
1236     // -------- User clicked the "Cancel" button when editing a link.
1237     if (isset($_POST['cancel_edit']))
1238     {
1239         // If we are called from the bookmarklet, we must close the popup:
1240         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1241         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1242         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1243         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1244         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1245         exit;
1246     }
1247
1248     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1249     if (isset($_POST['delete_link']))
1250     {
1251         if (!tokenOk($_POST['token'])) die('Wrong token.');
1252         // We do not need to ask for confirmation:
1253         // - confirmation is handled by JavaScript
1254         // - we are protected from XSRF by the token.
1255         $linkdate=$_POST['lf_linkdate'];
1256
1257         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1258
1259         unset($LINKSDB[$linkdate]);
1260         $LINKSDB->savedb('path.page_cache'); // save to disk
1261
1262         // If we are called from the bookmarklet, we must close the popup:
1263         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1264         // Pick where we're going to redirect
1265         // =============================================================
1266         // Basically, we can't redirect to where we were previously if it was a permalink
1267         // or an edit_link, because it would 404.
1268         // Cases:
1269         //    - /             : nothing in $_GET, redirect to self
1270         //    - /?page        : redirect to self
1271         //    - /?searchterm  : redirect to self (there might be other links)
1272         //    - /?searchtags  : redirect to self
1273         //    - /permalink    : redirect to / (the link does not exist anymore)
1274         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1275         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1276         // redirect is not satisfied, and only then redirect to /
1277         $location = "?";
1278         // Self redirection
1279         if (count($_GET) == 0
1280             || isset($_GET['page'])
1281             || isset($_GET['searchterm'])
1282             || isset($_GET['searchtags'])
1283         ) {
1284             if (isset($_POST['returnurl'])) {
1285                 $location = $_POST['returnurl']; // Handle redirects given by the form
1286             } else {
1287                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1288             }
1289         }
1290
1291         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1292         exit;
1293     }
1294
1295     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1296     if (isset($_GET['edit_link']))
1297     {
1298         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1299         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1300         $data = array(
1301             'link' => $link,
1302             'link_is_new' => false,
1303             'token' => getToken(),
1304             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1305             'tags' => $LINKSDB->allTags(),
1306         );
1307         $pluginManager->executeHooks('render_editlink', $data);
1308
1309         foreach ($data as $key => $value) {
1310             $PAGE->assign($key, $value);
1311         }
1312
1313         $PAGE->renderPage('editlink');
1314         exit;
1315     }
1316
1317     // -------- User want to post a new link: Display link edit form.
1318     if (isset($_GET['post'])) {
1319         $url = cleanup_url($_GET['post']);
1320
1321         $link_is_new = false;
1322         // Check if URL is not already in database (in this case, we will edit the existing link)
1323         $link = $LINKSDB->getLinkFromUrl($url);
1324         if (!$link)
1325         {
1326             $link_is_new = true;
1327             $linkdate = strval(date('Ymd_His'));
1328             // Get title if it was provided in URL (by the bookmarklet).
1329             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1330             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1331             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1332             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1333             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1334             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1335             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1336                 // Short timeout to keep the application responsive
1337                 list($headers, $content) = get_http_response($url, 4);
1338                 if (strpos($headers[0], '200 OK') !== false) {
1339                     // Retrieve charset.
1340                     $charset = get_charset($headers, $content);
1341                     // Extract title.
1342                     $title = html_extract_title($content);
1343                     // Re-encode title in utf-8 if necessary.
1344                     if (! empty($title) && strtolower($charset) != 'utf-8') {
1345                         $title = mb_convert_encoding($title, 'utf-8', $charset);
1346                     }
1347                 }
1348             }
1349
1350             if ($url == '') {
1351                 $url = '?' . smallHash($linkdate);
1352                 $title = 'Note: ';
1353             }
1354             $url = escape($url);
1355             $title = escape($title);
1356
1357             $link = array(
1358                 'linkdate' => $linkdate,
1359                 'title' => $title,
1360                 'url' => $url,
1361                 'description' => $description,
1362                 'tags' => $tags,
1363                 'private' => $private
1364             );
1365         }
1366
1367         $data = array(
1368             'link' => $link,
1369             'link_is_new' => $link_is_new,
1370             'token' => getToken(), // XSRF protection.
1371             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1372             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1373             'tags' => $LINKSDB->allTags(),
1374             'default_private_links' => $conf->get('default_private_links', false),
1375         );
1376         $pluginManager->executeHooks('render_editlink', $data);
1377
1378         foreach ($data as $key => $value) {
1379             $PAGE->assign($key, $value);
1380         }
1381
1382         $PAGE->renderPage('editlink');
1383         exit;
1384     }
1385
1386     if ($targetPage == Router::$PAGE_EXPORT) {
1387         // Export links as a Netscape Bookmarks file
1388
1389         if (empty($_GET['selection'])) {
1390             $PAGE->renderPage('export');
1391             exit;
1392         }
1393
1394         // export as bookmarks_(all|private|public)_YYYYmmdd_HHMMSS.html
1395         $selection = $_GET['selection'];
1396         if (isset($_GET['prepend_note_url'])) {
1397             $prependNoteUrl = $_GET['prepend_note_url'];
1398         } else {
1399             $prependNoteUrl = false;
1400         }
1401
1402         try {
1403             $PAGE->assign(
1404                 'links',
1405                 NetscapeBookmarkUtils::filterAndFormat(
1406                     $LINKSDB,
1407                     $selection,
1408                     $prependNoteUrl,
1409                     index_url($_SERVER)
1410                 )
1411             );
1412         } catch (Exception $exc) {
1413             header('Content-Type: text/plain; charset=utf-8');
1414             echo $exc->getMessage();
1415             exit;
1416         }
1417         $now = new DateTime();
1418         header('Content-Type: text/html; charset=utf-8');
1419         header(
1420             'Content-disposition: attachment; filename=bookmarks_'
1421            .$selection.'_'.$now->format(LinkDB::LINK_DATE_FORMAT).'.html'
1422         );
1423         $PAGE->assign('date', $now->format(DateTime::RFC822));
1424         $PAGE->assign('eol', PHP_EOL);
1425         $PAGE->assign('selection', $selection);
1426         $PAGE->renderPage('export.bookmarks');
1427         exit;
1428     }
1429
1430     // -------- User is uploading a file for import
1431     if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=upload'))
1432     {
1433         // If file is too big, some form field may be missing.
1434         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1435         {
1436             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1437             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1438             exit;
1439         }
1440         if (!tokenOk($_POST['token'])) die('Wrong token.');
1441         importFile($LINKSDB);
1442         exit;
1443     }
1444
1445     // -------- Show upload/import dialog:
1446     if ($targetPage == Router::$PAGE_IMPORT)
1447     {
1448         $PAGE->assign('token',getToken());
1449         $PAGE->assign('maxfilesize',getMaxFileSize());
1450         $PAGE->renderPage('import');
1451         exit;
1452     }
1453
1454     // Plugin administration page
1455     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1456         $pluginMeta = $pluginManager->getPluginsMeta();
1457
1458         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1459         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1460         // Load parameters.
1461         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $conf->get('plugins', array()));
1462         uasort(
1463             $enabledPlugins,
1464             function($a, $b) { return $a['order'] - $b['order']; }
1465         );
1466         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1467
1468         $PAGE->assign('enabledPlugins', $enabledPlugins);
1469         $PAGE->assign('disabledPlugins', $disabledPlugins);
1470         $PAGE->renderPage('pluginsadmin');
1471         exit;
1472     }
1473
1474     // Plugin administration form action
1475     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1476         try {
1477             if (isset($_POST['parameters_form'])) {
1478                 unset($_POST['parameters_form']);
1479                 foreach ($_POST as $param => $value) {
1480                     $conf->set('plugins.'. $param, escape($value));
1481                 }
1482             }
1483             else {
1484                 $conf->set('general.enabled_plugins', save_plugin_config($_POST));
1485             }
1486             $conf->write(isLoggedIn());
1487         }
1488         catch (Exception $e) {
1489             error_log(
1490                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1491                 $e->getMessage()
1492             );
1493
1494             // TODO: do not handle exceptions/errors in JS.
1495             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do='. Router::$PAGE_PLUGINSADMIN .'\';</script>';
1496             exit;
1497         }
1498         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1499         exit;
1500     }
1501
1502     // -------- Otherwise, simply display search form and links:
1503     showLinkList($PAGE, $LINKSDB);
1504     exit;
1505 }
1506
1507 // -----------------------------------------------------------------------------------------------
1508 // Process the import file form.
1509 function importFile($LINKSDB)
1510 {
1511     if (!isLoggedIn()) { die('Not allowed.'); }
1512     $conf = ConfigManager::getInstance();
1513
1514     $filename=$_FILES['filetoupload']['name'];
1515     $filesize=$_FILES['filetoupload']['size'];
1516     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1517     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1518     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1519     $import_count=0;
1520
1521     // Sniff file type:
1522     $type='unknown';
1523     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1524
1525     // Then import the bookmarks.
1526     if ($type=='netscape')
1527     {
1528         // This is a standard Netscape-style bookmark file.
1529         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1530         foreach(explode('<DT>',$data) as $html) // explode is very fast
1531         {
1532             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1533             $d = explode('<DD>',$html);
1534             if (startsWith($d[0], '<A '))
1535             {
1536                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1537                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1538                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1539                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1540                 $raw_add_date=0;
1541                 foreach($matches as $m)
1542                 {
1543                     $attr=$m[1]; $value=$m[2];
1544                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1545                     elseif ($attr=='ADD_DATE')
1546                     {
1547                         $raw_add_date=intval($value);
1548                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1549                     }
1550                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1551                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1552                 }
1553                 if ($link['url']!='')
1554                 {
1555                     if ($private==1) $link['private']=1;
1556                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1557                     if ($dblink==false)
1558                     {  // Link not in database, let's import it...
1559                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1560
1561                        // Make sure date/time is not already used by another link.
1562                        // (Some bookmark files have several different links with the same ADD_DATE)
1563                        // We increment date by 1 second until we find a date which is not used in DB.
1564                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1565                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1566                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1567                        $LINKSDB[$link['linkdate']] = $link;
1568                        $import_count++;
1569                     }
1570                     else // Link already present in database.
1571                     {
1572                         if ($overwrite)
1573                         {   // If overwrite is required, we import link data, except date/time.
1574                             $link['linkdate']=$dblink['linkdate'];
1575                             $LINKSDB[$link['linkdate']] = $link;
1576                             $import_count++;
1577                         }
1578                     }
1579
1580                 }
1581             }
1582         }
1583         $LINKSDB->savedb($conf->get('path.page_cache'));
1584
1585         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1586     }
1587     else
1588     {
1589         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1590     }
1591 }
1592
1593 /**
1594  * Template for the list of links (<div id="linklist">)
1595  * This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1596  *
1597  * @param pageBuilder $PAGE    pageBuilder instance.
1598  * @param LinkDB      $LINKSDB LinkDB instance.
1599  */
1600 function buildLinkList($PAGE,$LINKSDB)
1601 {
1602     $conf = ConfigManager::getInstance();
1603     // Used in templates
1604     $searchtags = !empty($_GET['searchtags']) ? escape($_GET['searchtags']) : '';
1605     $searchterm = !empty($_GET['searchterm']) ? escape($_GET['searchterm']) : '';
1606
1607     // Smallhash filter
1608     if (! empty($_SERVER['QUERY_STRING'])
1609         && preg_match('/^[a-zA-Z0-9-_@]{6}($|&|#)/', $_SERVER['QUERY_STRING'])) {
1610         try {
1611             $linksToDisplay = $LINKSDB->filterHash($_SERVER['QUERY_STRING']);
1612         } catch (LinkNotFoundException $e) {
1613             $PAGE->render404($e->getMessage());
1614             exit;
1615         }
1616     } else {
1617         // Filter links according search parameters.
1618         $privateonly = !empty($_SESSION['privateonly']);
1619         $linksToDisplay = $LINKSDB->filterSearch($_GET, false, $privateonly);
1620     }
1621
1622     // ---- Handle paging.
1623     $keys = array();
1624     foreach ($linksToDisplay as $key => $value) {
1625         $keys[] = $key;
1626     }
1627
1628     // If there is only a single link, we change on-the-fly the title of the page.
1629     if (count($linksToDisplay) == 1) {
1630         $conf->set('pagetitle', $linksToDisplay[$keys[0]]['title'] .' - '. $conf->get('general.title'));
1631     }
1632
1633     // Select articles according to paging.
1634     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1635     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1636     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1637     $page = $page < 1 ? 1 : $page;
1638     $page = $page > $pagecount ? $pagecount : $page;
1639     // Start index.
1640     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1641     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1642     $linkDisp = array();
1643     while ($i<$end && $i<count($keys))
1644     {
1645         $link = $linksToDisplay[$keys[$i]];
1646         $link['description'] = format_description($link['description'], $conf->get('extras.redirector'));
1647         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
1648         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
1649         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
1650         $link['timestamp'] = $date->getTimestamp();
1651         $taglist = explode(' ', $link['tags']);
1652         uasort($taglist, 'strcasecmp');
1653         $link['taglist'] = $taglist;
1654         $link['shorturl'] = smallHash($link['linkdate']);
1655         // Check for both signs of a note: starting with ? and 7 chars long.
1656         if ($link['url'][0] === '?' &&
1657             strlen($link['url']) === 7) {
1658             $link['url'] = index_url($_SERVER) . $link['url'];
1659         }
1660
1661         $linkDisp[$keys[$i]] = $link;
1662         $i++;
1663     }
1664
1665     // Compute paging navigation
1666     $searchtagsUrl = empty($searchtags) ? '' : '&searchtags=' . urlencode($searchtags);
1667     $searchtermUrl = empty($searchterm) ? '' : '&searchterm=' . urlencode($searchterm);
1668     $previous_page_url = '';
1669     if ($i != count($keys)) {
1670         $previous_page_url = '?page=' . ($page+1) . $searchtermUrl . $searchtagsUrl;
1671     }
1672     $next_page_url='';
1673     if ($page>1) {
1674         $next_page_url = '?page=' . ($page-1) . $searchtermUrl . $searchtagsUrl;
1675     }
1676
1677     $token = isLoggedIn() ? getToken() : '';
1678
1679     // Fill all template fields.
1680     $data = array(
1681         'previous_page_url' => $previous_page_url,
1682         'next_page_url' => $next_page_url,
1683         'page_current' => $page,
1684         'page_max' => $pagecount,
1685         'result_count' => count($linksToDisplay),
1686         'search_term' => $searchterm,
1687         'search_tags' => $searchtags,
1688         'redirector' => $conf->get('extras.redirector'),  // Optional redirector URL.
1689         'token' => $token,
1690         'links' => $linkDisp,
1691         'tags' => $LINKSDB->allTags(),
1692     );
1693     // FIXME! temporary fix - see #399.
1694     if ($conf->exists('pagetitle') && count($linkDisp) == 1) {
1695         $data['pagetitle'] = $conf->get('pagetitle');
1696     }
1697
1698     $pluginManager = PluginManager::getInstance();
1699     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
1700
1701     foreach ($data as $key => $value) {
1702         $PAGE->assign($key, $value);
1703     }
1704
1705     return;
1706 }
1707
1708 // Compute the thumbnail for a link.
1709 //
1710 // With a link to the original URL.
1711 // Understands various services (youtube.com...)
1712 // Input: $url = URL for which the thumbnail must be found.
1713 //        $href = if provided, this URL will be followed instead of $url
1714 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1715 // Some of them may be missing.
1716 // Return an empty array if no thumbnail available.
1717 function computeThumbnail($url,$href=false)
1718 {
1719     $conf = ConfigManager::getInstance();
1720     if (!$conf->get('general.enable_thumbnails')) return array();
1721     if ($href==false) $href=$url;
1722
1723     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1724     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1725     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1726     $domain = parse_url($url,PHP_URL_HOST);
1727     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1728     {
1729         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1730         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1731                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1732     }
1733     if ($domain=='youtu.be') // Youtube short links
1734     {
1735         $path = parse_url($url,PHP_URL_PATH);
1736         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1737                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1738     }
1739     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1740     {
1741         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1742         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1743                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1744     }
1745
1746     if ($domain=='imgur.com')
1747     {
1748         $path = parse_url($url,PHP_URL_PATH);
1749         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1750         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1751                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1752         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1753                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1754
1755         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1756                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1757     }
1758     if ($domain=='i.imgur.com')
1759     {
1760         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1761         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1762                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1763     }
1764     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1765     {
1766         if (strpos($url,'dailymotion.com/video/')!==false)
1767         {
1768             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1769             return array('src'=>$thumburl,
1770                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1771         }
1772     }
1773     if (endsWith($domain,'.imageshack.us'))
1774     {
1775         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1776         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1777         {
1778             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1779             return array('src'=>$thumburl,
1780                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1781         }
1782     }
1783
1784     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1785     // So we deport the thumbnail generation in order not to slow down page generation
1786     // (and we also cache the thumbnail)
1787
1788     if (! $conf->get('general.enable_localcache')) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1789
1790     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1791         || $domain=='vimeo.com'
1792         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1793         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1794     )
1795     {
1796         if ($domain=='vimeo.com')
1797         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1798             $path = parse_url($url,PHP_URL_PATH);
1799             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1800         }
1801         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
1802         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
1803             $path = parse_url($url,PHP_URL_PATH);
1804             if (!preg_match('!/\d+.+?!',$path)) return array();
1805         }
1806         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
1807         {   // Make sure this TED URL points to a video (/talks/...)
1808             $path = parse_url($url,PHP_URL_PATH);
1809             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
1810         }
1811         $sign = hash_hmac('sha256', $url, $conf->get('credentials.salt')); // We use the salt to sign data (it's random, secret, and specific to each installation)
1812         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1813                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1814     }
1815
1816     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1817     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1818     // But using the extension will do.
1819     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1820     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1821     {
1822         $sign = hash_hmac('sha256', $url, $conf->get('credentials.salt')); // We use the salt to sign data (it's random, secret, and specific to each installation)
1823         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1824                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1825     }
1826     return array(); // No thumbnail.
1827
1828 }
1829
1830
1831 // Returns the HTML code to display a thumbnail for a link
1832 // with a link to the original URL.
1833 // Understands various services (youtube.com...)
1834 // Input: $url = URL for which the thumbnail must be found.
1835 //        $href = if provided, this URL will be followed instead of $url
1836 // Returns '' if no thumbnail available.
1837 function thumbnail($url,$href=false)
1838 {
1839     $t = computeThumbnail($url,$href);
1840     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1841
1842     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
1843     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1844     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1845     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1846     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1847     $html.='></a>';
1848     return $html;
1849 }
1850
1851 // Returns the HTML code to display a thumbnail for a link
1852 // for the picture wall (using lazy image loading)
1853 // Understands various services (youtube.com...)
1854 // Input: $url = URL for which the thumbnail must be found.
1855 //        $href = if provided, this URL will be followed instead of $url
1856 // Returns '' if no thumbnail available.
1857 function lazyThumbnail($url,$href=false)
1858 {
1859     $t = computeThumbnail($url,$href);
1860     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1861
1862     $html='<a href="'.escape($t['href']).'">';
1863
1864     // Lazy image
1865     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
1866
1867     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1868     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1869     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1870     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1871     $html.='>';
1872
1873     // No-JavaScript fallback.
1874     $html.='<noscript><img src="'.escape($t['src']).'"';
1875     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1876     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1877     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1878     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1879     $html.='></noscript></a>';
1880
1881     return $html;
1882 }
1883
1884
1885 // -----------------------------------------------------------------------------------------------
1886 // Installation
1887 // This function should NEVER be called if the file data/config.php exists.
1888 function install()
1889 {
1890     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
1891     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
1892
1893
1894     // This part makes sure sessions works correctly.
1895     // (Because on some hosts, session.save_path may not be set correctly,
1896     // or we may not have write access to it.)
1897     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
1898     {   // Step 2: Check if data in session is correct.
1899         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
1900         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
1901         echo 'It currently points to '.session_save_path().'<br>';
1902         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
1903         echo '<br><a href="?">Click to try again.</a></pre>';
1904         die;
1905     }
1906     if (!isset($_SESSION['session_tested']))
1907     {   // Step 1 : Try to store data in session and reload page.
1908         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
1909         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
1910     }
1911     if (isset($_GET['test_session']))
1912     {   // Step 3: Sessions are OK. Remove test parameter from URL.
1913         header('Location: '.index_url($_SERVER));
1914     }
1915
1916
1917     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
1918     {
1919         $conf = ConfigManager::getInstance();
1920         $tz = 'UTC';
1921         if (!empty($_POST['continent']) && !empty($_POST['city'])
1922             && isTimeZoneValid($_POST['continent'], $_POST['city'])
1923         ) {
1924             $tz = $_POST['continent'].'/'.$_POST['city'];
1925         }
1926         $conf->set('general.timezone', $tz);
1927         $login = $_POST['setlogin'];
1928         $conf->set('credentials.login', $login);
1929         $salt = sha1(uniqid('', true) .'_'. mt_rand());
1930         $conf->set('credentials.salt', $salt);
1931         $conf->set('credentials.hash', sha1($_POST['setpassword'] . $login . $salt));
1932         if (!empty($_POST['title'])) {
1933             $conf->set('general.title', escape($_POST['title']));
1934         } else {
1935             $conf->set('general.title', 'Shared links on '.escape(index_url($_SERVER)));
1936         }
1937         $conf->set('general.check_updates', !empty($_POST['updateCheck']));
1938         try {
1939             // Everything is ok, let's create config file.
1940             $conf->write(isLoggedIn());
1941         }
1942         catch(Exception $e) {
1943             error_log(
1944                     'ERROR while writing config file after installation.' . PHP_EOL .
1945                     $e->getMessage()
1946                 );
1947
1948             // TODO: do not handle exceptions/errors in JS.
1949             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
1950             exit;
1951         }
1952         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
1953         exit;
1954     }
1955
1956     // Display config form:
1957     list($timezone_form, $timezone_js) = generateTimeZoneForm();
1958     $timezone_html = '';
1959     if ($timezone_form != '') {
1960         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
1961     }
1962
1963     $PAGE = new PageBuilder();
1964     $PAGE->assign('timezone_html',$timezone_html);
1965     $PAGE->assign('timezone_js',$timezone_js);
1966     $PAGE->renderPage('install');
1967     exit;
1968 }
1969
1970 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
1971    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
1972    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
1973    This function is called by passing the URL:
1974    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
1975    [URL] is the URL of the link (e.g. a flickr page)
1976    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
1977    The function below will fetch the image from the webservice and store it in the cache.
1978 */
1979 function genThumbnail()
1980 {
1981     $conf = ConfigManager::getInstance();
1982     // Make sure the parameters in the URL were generated by us.
1983     $sign = hash_hmac('sha256', $_GET['url'], $conf->get('credentials.salt'));
1984     if ($sign!=$_GET['hmac']) die('Naughty boy!');
1985
1986     $cacheDir = $conf->get('path.thumbnails_cache', 'cache');
1987     // Let's see if we don't already have the image for this URL in the cache.
1988     $thumbname=hash('sha1',$_GET['url']).'.jpg';
1989     if (is_file($cacheDir .'/'. $thumbname))
1990     {   // We have the thumbnail, just serve it:
1991         header('Content-Type: image/jpeg');
1992         echo file_get_contents($cacheDir .'/'. $thumbname);
1993         return;
1994     }
1995     // We may also serve a blank image (if service did not respond)
1996     $blankname=hash('sha1',$_GET['url']).'.gif';
1997     if (is_file($cacheDir .'/'. $blankname))
1998     {
1999         header('Content-Type: image/gif');
2000         echo file_get_contents($cacheDir .'/'. $blankname);
2001         return;
2002     }
2003
2004     // Otherwise, generate the thumbnail.
2005     $url = $_GET['url'];
2006     $domain = parse_url($url,PHP_URL_HOST);
2007
2008     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2009     {
2010         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2011         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2012
2013         // Is this a link to an image, or to a flickr page ?
2014         $imageurl='';
2015         if (endsWith(parse_url($url, PHP_URL_PATH), '.jpg'))
2016         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2017             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2018             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2019         }
2020         else // This is a flickr page (html)
2021         {
2022             // Get the flickr html page.
2023             list($headers, $content) = get_http_response($url, 20);
2024             if (strpos($headers[0], '200 OK') !== false)
2025             {
2026                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2027                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2028                 if (!empty($matches[1])) $imageurl=$matches[1];
2029
2030                 // In albums (and some other pages), the link rel="image_src" is not provided,
2031                 // but flickr provides:
2032                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2033                 if ($imageurl=='')
2034                 {
2035                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2036                     if (!empty($matches[1])) $imageurl=$matches[1];
2037                 }
2038             }
2039         }
2040
2041         if ($imageurl!='')
2042         {   // Let's download the image.
2043             // Image is 240x120, so 10 seconds to download should be enough.
2044             list($headers, $content) = get_http_response($imageurl, 10);
2045             if (strpos($headers[0], '200 OK') !== false) {
2046                 // Save image to cache.
2047                 file_put_contents($cacheDir .'/'. $thumbname, $content);
2048                 header('Content-Type: image/jpeg');
2049                 echo $content;
2050                 return;
2051             }
2052         }
2053     }
2054
2055     elseif ($domain=='vimeo.com' )
2056     {
2057         // This is more complex: we have to perform a HTTP request, then parse the result.
2058         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2059         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2060         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2061         if (strpos($headers[0], '200 OK') !== false) {
2062             $t = unserialize($content);
2063             $imageurl = $t[0]['thumbnail_medium'];
2064             // Then we download the image and serve it to our client.
2065             list($headers, $content) = get_http_response($imageurl, 10);
2066             if (strpos($headers[0], '200 OK') !== false) {
2067                 // Save image to cache.
2068                 file_put_contents($cacheDir .'/'. $thumbname, $content);
2069                 header('Content-Type: image/jpeg');
2070                 echo $content;
2071                 return;
2072             }
2073         }
2074     }
2075
2076     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2077     {
2078         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2079         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2080         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2081         list($headers, $content) = get_http_response($url, 5);
2082         if (strpos($headers[0], '200 OK') !== false) {
2083             // Extract the link to the thumbnail
2084             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2085             if (!empty($matches[1]))
2086             {   // Let's download the image.
2087                 $imageurl=$matches[1];
2088                 // No control on image size, so wait long enough
2089                 list($headers, $content) = get_http_response($imageurl, 20);
2090                 if (strpos($headers[0], '200 OK') !== false) {
2091                     $filepath = $cacheDir .'/'. $thumbname;
2092                     file_put_contents($filepath, $content); // Save image to cache.
2093                     if (resizeImage($filepath))
2094                     {
2095                         header('Content-Type: image/jpeg');
2096                         echo file_get_contents($filepath);
2097                         return;
2098                     }
2099                 }
2100             }
2101         }
2102     }
2103
2104     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2105     {
2106         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2107         // http://xkcd.com/327/
2108         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2109         list($headers, $content) = get_http_response($url, 5);
2110         if (strpos($headers[0], '200 OK') !== false) {
2111             // Extract the link to the thumbnail
2112             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2113             if (!empty($matches[1]))
2114             {   // Let's download the image.
2115                 $imageurl=$matches[1];
2116                 // No control on image size, so wait long enough
2117                 list($headers, $content) = get_http_response($imageurl, 20);
2118                 if (strpos($headers[0], '200 OK') !== false) {
2119                     $filepath = $cacheDir.'/'.$thumbname;
2120                     // Save image to cache.
2121                     file_put_contents($filepath, $content);
2122                     if (resizeImage($filepath))
2123                     {
2124                         header('Content-Type: image/jpeg');
2125                         echo file_get_contents($filepath);
2126                         return;
2127                     }
2128                 }
2129             }
2130         }
2131     }
2132
2133     else
2134     {
2135         // For all other domains, we try to download the image and make a thumbnail.
2136         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2137         list($headers, $content) = get_http_response($url, 30);
2138         if (strpos($headers[0], '200 OK') !== false) {
2139             $filepath = $cacheDir .'/'.$thumbname;
2140             // Save image to cache.
2141             file_put_contents($filepath, $content);
2142             if (resizeImage($filepath))
2143             {
2144                 header('Content-Type: image/jpeg');
2145                 echo file_get_contents($filepath);
2146                 return;
2147             }
2148         }
2149     }
2150
2151
2152     // Otherwise, return an empty image (8x8 transparent gif)
2153     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2154     // Also put something in cache so that this URL is not requested twice.
2155     file_put_contents($cacheDir .'/'. $blankname, $blankgif);
2156     header('Content-Type: image/gif');
2157     echo $blankgif;
2158 }
2159
2160 // Make a thumbnail of the image (to width: 120 pixels)
2161 // Returns true if success, false otherwise.
2162 function resizeImage($filepath)
2163 {
2164     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2165
2166     // Trick: some stupid people rename GIF as JPEG... or else.
2167     // So we really try to open each image type whatever the extension is.
2168     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2169     $im=false;
2170     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2171     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2172     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2173     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2174     $w = imagesx($im);
2175     $h = imagesy($im);
2176     $ystart = 0; $yheight=$h;
2177     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2178     $nw = 120;   // Desired width
2179     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2180     // Resize image:
2181     $im2 = imagecreatetruecolor($nw,$nh);
2182     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2183     imageinterlace($im2,true); // For progressive JPEG.
2184     $tempname=$filepath.'_TEMP.jpg';
2185     imagejpeg($im2, $tempname, 90);
2186     imagedestroy($im);
2187     imagedestroy($im2);
2188     unlink($filepath);
2189     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2190     return true;
2191 }
2192
2193 if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2194 if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=dailyrss')) { showDailyRSS(); exit; }
2195 if (!isset($_SESSION['LINKS_PER_PAGE'])) {
2196     $_SESSION['LINKS_PER_PAGE'] = $conf->get('general.links_per_page', 20);
2197 }
2198 renderPage();
2199 ?>