index.php

   1 <?php
   2 // Shaarli 0.0.45beta - Shaare your links...
   3 // The personal, minimalist, super-fast, no-database Delicious clone. By sebsauvage.net
   4 // http://sebsauvage.net/wiki/doku.php?id=php:shaarli
   5 // Licence: http://www.opensource.org/licenses/zlib-license.php
   6 // Requires: PHP 5.1.x  (but autocomplete fields will only work if you have PHP 5.2.x)
   7 // -----------------------------------------------------------------------------------------------
   8 // NEVER TRUST IN PHP.INI
   9 // Some hosts do not define a default timezone in php.ini,
  10 // so we have to do this for avoid the strict standard error.
  11 date_default_timezone_set('UTC');
  12
  13 // -----------------------------------------------------------------------------------------------
  14 // Hardcoded parameter (These parameters can be overwritten by editing the file /data/config.php)
  15 // You should not touch any code below (or at your own risks!)
  16 $GLOBALS['config']['DATADIR'] = 'data'; // Data subdirectory
  17 $GLOBALS['config']['CONFIG_FILE'] = $GLOBALS['config']['DATADIR'].'/config.php'; // Configuration file (user login/password)
  18 $GLOBALS['config']['DATASTORE'] = $GLOBALS['config']['DATADIR'].'/datastore.php'; // Data storage file.
  19 $GLOBALS['config']['LINKS_PER_PAGE'] = 20; // Default links per page.
  20 $GLOBALS['config']['IPBANS_FILENAME'] = $GLOBALS['config']['DATADIR'].'/ipbans.php'; // File storage for failures and bans.
  21 $GLOBALS['config']['BAN_AFTER'] = 4;        // Ban IP after this many failures.
  22 $GLOBALS['config']['BAN_DURATION'] = 1800;  // Ban duration for IP address after login failures (in seconds) (1800 sec. = 30 minutes)
  23 $GLOBALS['config']['OPEN_SHAARLI'] = false; // If true, anyone can add/edit/delete links without having to login
  24 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false; // If true, the moment when links were saved are not shown to users that are not logged in.
  25 $GLOBALS['config']['SHOW_ATOM'] = false; // If true, an extra "ATOM feed" button will be displayed in the toolbar
  26 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true; // Enable thumbnails in links.
  27 $GLOBALS['config']['CACHEDIR'] = 'cache'; // Cache directory for thumbnails for SLOW services (like flickr)
  28 $GLOBALS['config']['PAGECACHE'] = 'pagecache'; // Page cache directory.
  29 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true; // Enable Shaarli to store thumbnail in a local cache. Disable to reduce web space usage.
  30 $GLOBALS['config']['PUBSUBHUB_URL'] = ''; // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
  31 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp/' ; // Raintpl cache directory  (keep the trailing slash!)
  32 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/' ; // Raintpl template directory (keep the trailing slash!)
  33 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt'; // For updates check of Shaarli.
  34 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400 ; // Updates check frequency for Shaarli. 86400 seconds=24 hours
  35                                           // Note: You must have publisher.php in the same directory as Shaarli index.php
  36 $GLOBALS['config']['ARCHIVE_ORG'] = false; // For each link, add a link to an archived version on archive.org
  37 $GLOBALS['config']['ENABLE_RSS_PERMALINKS'] = true;  // Enable RSS permalinks by default. This corresponds to the default behavior of shaarli before this was added as an option.
  38 $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = false;
  39 // -----------------------------------------------------------------------------------------------
  40 define('shaarli_version','0.0.45beta');
  41 // http://server.com/x/shaarli --> /shaarli/
  42 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
  43
  44 // Force cookie path (but do not change lifetime)
  45 $cookie=session_get_cookie_params();
  46 $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
  47 session_set_cookie_params($cookie['lifetime'],$cookiedir,$_SERVER['SERVER_NAME']); // Set default cookie expiration and path.
  48
  49 // Set session parameters on server side.
  50 define('INACTIVITY_TIMEOUT',3600); // (in seconds). If the user does not access any page within this time, his/her session is considered expired.
  51 ini_set('session.use_cookies', 1);       // Use cookies to store session.
  52 ini_set('session.use_only_cookies', 1);  // Force cookies for session (phpsessionID forbidden in URL).
  53 ini_set('session.use_trans_sid', false); // Prevent PHP form using sessionID in URL if cookies are disabled.
  54 session_name('shaarli');
  55 if (session_id() == '') session_start();  // Start session if needed (Some server auto-start sessions).
  56
  57 // PHP Settings
  58 ini_set('max_input_time','60');  // High execution time in case of problematic imports/exports.
  59 ini_set('memory_limit', '128M');  // Try to set max upload file size and read (May not work on some hosts).
  60 ini_set('post_max_size', '16M');
  61 ini_set('upload_max_filesize', '16M');
  62 checkphpversion();
  63 error_reporting(E_ALL^E_WARNING);  // See all error except warnings.
  64 //error_reporting(-1); // See all errors (for debugging only)
  65
  66 // Shaarli library
  67 require_once 'application/LinkDB.php';
  68 require_once 'application/Utils.php';
  69 require_once 'application/Config.php';
  70
  71 include "inc/rain.tpl.class.php"; //include Rain TPL
  72 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
  73 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
  74
  75 ob_start();  // Output buffering for the page cache.
  76
  77
  78 // In case stupid admin has left magic_quotes enabled in php.ini:
  79 if (get_magic_quotes_gpc())
  80 {
  81     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
  82     $_POST = array_map('stripslashes_deep', $_POST);
  83     $_GET = array_map('stripslashes_deep', $_GET);
  84     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
  85 }
  86
  87 // Prevent caching on client side or proxy: (yes, it's ugly)
  88 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
  89 header("Cache-Control: no-store, no-cache, must-revalidate");
  90 header("Cache-Control: post-check=0, pre-check=0", false);
  91 header("Pragma: no-cache");
  92
  93 // Directories creations (Note that your web host may require different rights than 705.)
  94 if (!is_writable(realpath(dirname(__FILE__)))) die('<pre>ERROR: Shaarli does not have the right to write in its own directory.</pre>');
  95
  96 // Handling of old config file which do not have the new parameters.
  97 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(indexUrl());
  98 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
  99 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 100 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 101 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 102 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 103 // I really need to rewrite Shaarli with a proper configuation manager.
 104
 105 // Run config screen if first run:
 106 if (!is_file($GLOBALS['config']['CONFIG_FILE'])) install();
 107
 108 require $GLOBALS['config']['CONFIG_FILE'];  // Read login/password hash into $GLOBALS.
 109 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 110 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 111 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 112
 113 // a token depending of deployment salt, user password, and the current ip
 114 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 115
 116 autoLocale(); // Sniff browser language and set date format accordingly.
 117 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 118
 119 //==================================================================================================
 120 // Checking session state (i.e. is the user still logged in)
 121 //==================================================================================================
 122
 123 function setup_login_state() {
 124         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 125         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 126         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 127             $userIsLoggedIn = true;
 128         }
 129         if (!isset($GLOBALS['login'])) {
 130             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 131             $loginFailure = true;
 132         }
 133         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 134             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 135             !$loginFailure)
 136         {
 137             fillSessionInfo();
 138             $userIsLoggedIn = true;
 139         }
 140         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 141         if (empty($_SESSION['uid']) ||
 142             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 143             time() >= $_SESSION['expires_on'])
 144         {
 145             logout();
 146             $userIsLoggedIn = false;
 147             $loginFailure = true;
 148         }
 149         if (!empty($_SESSION['longlastingsession'])) {
 150             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 151         }
 152         else {
 153             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 154         }
 155         if (!$loginFailure) {
 156             $userIsLoggedIn = true;
 157         }
 158
 159         return $userIsLoggedIn;
 160 }
 161 //==================================================================================================
 162 $userIsLoggedIn = setup_login_state();
 163 //==================================================================================================
 164 //==================================================================================================
 165
 166 // Check PHP version
 167 function checkphpversion()
 168 {
 169     if (version_compare(PHP_VERSION, '5.1.0') < 0)
 170     {
 171         header('Content-Type: text/plain; charset=utf-8');
 172         echo 'Your PHP version is obsolete! Shaarli requires at least php 5.1.0, and thus cannot run. Sorry. Your PHP version has known security vulnerabilities and should be updated as soon as possible.';
 173         exit;
 174     }
 175 }
 176
 177 // Checks if an update is available for Shaarli.
 178 // (at most once a day, and only for registered user.)
 179 // Output: '' = no new version.
 180 //         other= the available version.
 181 function checkUpdate()
 182 {
 183     if (!isLoggedIn()) return ''; // Do not check versions for visitors.
 184     if (empty($GLOBALS['config']['ENABLE_UPDATECHECK'])) return ''; // Do not check if the user doesn't want to.
 185
 186     // Get latest version number at most once a day.
 187     if (!is_file($GLOBALS['config']['UPDATECHECK_FILENAME']) || (filemtime($GLOBALS['config']['UPDATECHECK_FILENAME'])<time()-($GLOBALS['config']['UPDATECHECK_INTERVAL'])))
 188     {
 189         $version=shaarli_version;
 190         list($httpstatus,$headers,$data) = getHTTP('https://raw.githubusercontent.com/shaarli/Shaarli/master/shaarli_version.php',2);
 191         if (strpos($httpstatus,'200 OK')!==false) $version=str_replace(' */ ?>','',str_replace('<?php /* ','',$data));
 192         // If failed, never mind. We don't want to bother the user with that.
 193         file_put_contents($GLOBALS['config']['UPDATECHECK_FILENAME'],$version); // touch file date
 194     }
 195     // Compare versions:
 196     $newestversion=file_get_contents($GLOBALS['config']['UPDATECHECK_FILENAME']);
 197     if (version_compare($newestversion,shaarli_version)==1) return $newestversion;
 198     return '';
 199 }
 200
 201
 202 // -----------------------------------------------------------------------------------------------
 203 // Simple cache system (mainly for the RSS/ATOM feeds).
 204
 205 class pageCache
 206 {
 207     private $url; // Full URL of the page to cache (typically the value returned by pageUrl())
 208     private $shouldBeCached; // boolean: Should this url be cached?
 209     private $filename; // Name of the cache file for this url.
 210
 211     /*
 212          $url = URL (typically the value returned by pageUrl())
 213          $shouldBeCached = boolean. If false, the cache will be disabled.
 214     */
 215     public function __construct($url,$shouldBeCached)
 216     {
 217         $this->url = $url;
 218         $this->filename = $GLOBALS['config']['PAGECACHE'].'/'.sha1($url).'.cache';
 219         $this->shouldBeCached = $shouldBeCached;
 220     }
 221
 222     // If the page should be cached and a cached version exists,
 223     // returns the cached version (otherwise, return null).
 224     public function cachedVersion()
 225     {
 226         if (!$this->shouldBeCached) return null;
 227         if (is_file($this->filename)) { return file_get_contents($this->filename); exit; }
 228         return null;
 229     }
 230
 231     // Put a page in the cache.
 232     public function cache($page)
 233     {
 234         if (!$this->shouldBeCached) return;
 235         file_put_contents($this->filename,$page);
 236     }
 237
 238     // Purge the whole cache.
 239     // (call with pageCache::purgeCache())
 240     public static function purgeCache()
 241     {
 242         if (is_dir($GLOBALS['config']['PAGECACHE']))
 243         {
 244             $handler = opendir($GLOBALS['config']['PAGECACHE']);
 245             if ($handler!==false)
 246             {
 247                 while (($filename = readdir($handler))!==false)
 248                 {
 249                     if (endsWith($filename,'.cache')) { unlink($GLOBALS['config']['PAGECACHE'].'/'.$filename); }
 250                 }
 251                 closedir($handler);
 252             }
 253         }
 254     }
 255
 256 }
 257
 258
 259 // -----------------------------------------------------------------------------------------------
 260 // Log to text file
 261 function logm($message)
 262 {
 263     $t = strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n";
 264     file_put_contents($GLOBALS['config']['DATADIR'].'/log.txt',$t,FILE_APPEND);
 265 }
 266
 267 // In a string, converts URLs to clickable links.
 268 // Function inspired from http://www.php.net/manual/en/function.preg-replace.php#85722
 269 function text2clickable($url)
 270 {
 271     $redir = empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'];
 272     return preg_replace('!(((?:https?|ftp|file)://|apt:|magnet:)\S+[[:alnum:]]/?)!si','<a href="'.$redir.'$1" rel="nofollow">$1</a>',$url);
 273 }
 274
 275 // This function inserts &nbsp; where relevant so that multiple spaces are properly displayed in HTML
 276 // even in the absence of <pre>  (This is used in description to keep text formatting)
 277 function keepMultipleSpaces($text)
 278 {
 279     return str_replace('  ',' &nbsp;',$text);
 280
 281 }
 282 // ------------------------------------------------------------------------------------------
 283 // Sniff browser language to display dates in the right format automatically.
 284 // (Note that is may not work on your server if the corresponding local is not installed.)
 285 function autoLocale()
 286 {
 287     $attempts = array('en_US'); // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 288     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 289     {   // (It's a bit crude, but it works very well. Preferred language is always presented first.)
 290         if (preg_match('/([a-z]{2})-?([a-z]{2})?/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) {
 291             $loc = $matches[1] . (!empty($matches[2]) ? '_' . strtoupper($matches[2]) : '');
 292             $attempts = array($loc.'.UTF-8', $loc, str_replace('_', '-', $loc).'.UTF-8', str_replace('_', '-', $loc),
 293                 $loc . '_' . strtoupper($loc).'.UTF-8', $loc . '_' . strtoupper($loc),
 294                 $loc . '_' . $loc.'.UTF-8', $loc . '_' . $loc, $loc . '-' . strtoupper($loc).'.UTF-8',
 295                 $loc . '-' . strtoupper($loc), $loc . '-' . $loc.'.UTF-8', $loc . '-' . $loc);
 296         }
 297     }
 298     setlocale(LC_TIME, $attempts);  // LC_TIME = Set local for date/time format only.
 299 }
 300
 301 // ------------------------------------------------------------------------------------------
 302 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 303 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 304 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 305 function pubsubhub()
 306 {
 307     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 308     {
 309        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 310        $topic_url = array (
 311                        indexUrl().'?do=atom',
 312                        indexUrl().'?do=rss'
 313                     );
 314        $p->publish_update($topic_url);
 315     }
 316 }
 317
 318 // ------------------------------------------------------------------------------------------
 319 // Session management
 320
 321 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 322 function allIPs()
 323 {
 324     $ip = $_SERVER["REMOTE_ADDR"];
 325     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 326     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 327     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 328     return $ip;
 329 }
 330
 331 function fillSessionInfo() {
 332         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 333         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 334         $_SESSION['username']=$GLOBALS['login'];
 335         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 336 }
 337
 338 // Check that user/password is correct.
 339 function check_auth($login,$password)
 340 {
 341     $hash = sha1($password.$login.$GLOBALS['salt']);
 342     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 343     {   // Login/password is correct.
 344                 fillSessionInfo();
 345         logm('Login successful');
 346         return True;
 347     }
 348     logm('Login failed for user '.$login);
 349     return False;
 350 }
 351
 352 // Returns true if the user is logged in.
 353 function isLoggedIn()
 354 {
 355     global $userIsLoggedIn;
 356     return $userIsLoggedIn;
 357 }
 358
 359 // Force logout.
 360 function logout() {
 361     if (isset($_SESSION)) {
 362         unset($_SESSION['uid']);
 363         unset($_SESSION['ip']);
 364         unset($_SESSION['username']);
 365         unset($_SESSION['privateonly']);
 366     }
 367     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 368 }
 369
 370
 371 // ------------------------------------------------------------------------------------------
 372 // Brute force protection system
 373 // Several consecutive failed logins will ban the IP address for 30 minutes.
 374 if (!is_file($GLOBALS['config']['IPBANS_FILENAME'])) file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export(array('FAILURES'=>array(),'BANS'=>array()),true).";\n?>");
 375 include $GLOBALS['config']['IPBANS_FILENAME'];
 376 // Signal a failed login. Will ban the IP if too many failures:
 377 function ban_loginFailed()
 378 {
 379     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 380     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 381     $gb['FAILURES'][$ip]++;
 382     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 383     {
 384         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 385         logm('IP address banned from login');
 386     }
 387     $GLOBALS['IPBANS'] = $gb;
 388     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 389 }
 390
 391 // Signals a successful login. Resets failed login counter.
 392 function ban_loginOk()
 393 {
 394     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 395     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 396     $GLOBALS['IPBANS'] = $gb;
 397     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 398 }
 399
 400 // Checks if the user CAN login. If 'true', the user can try to login.
 401 function ban_canLogin()
 402 {
 403     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 404     if (isset($gb['BANS'][$ip]))
 405     {
 406         // User is banned. Check if the ban has expired:
 407         if ($gb['BANS'][$ip]<=time())
 408         {   // Ban expired, user can try to login again.
 409             logm('Ban lifted.');
 410             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 411             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 412             return true; // Ban has expired, user can login.
 413         }
 414         return false; // User is banned.
 415     }
 416     return true; // User is not banned.
 417 }
 418
 419 // ------------------------------------------------------------------------------------------
 420 // Process login form: Check if login/password is correct.
 421 if (isset($_POST['login']))
 422 {
 423     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 424     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 425     {   // Login/password is OK.
 426         ban_loginOk();
 427         // If user wants to keep the session cookie even after the browser closes:
 428         if (!empty($_POST['longlastingsession']))
 429         {
 430                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 431             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 432             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 433
 434             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 435             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 436             // Note: Never forget the trailing slash on the cookie path!
 437             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 438         }
 439         else // Standard session expiration (=when browser closes)
 440         {
 441             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 442             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 443             session_regenerate_id(true);
 444         }
 445         // Optional redirect after login:
 446         if (isset($_GET['post'])) { header('Location: ?post='.urlencode($_GET['post']).(!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').(!empty($_GET['description'])?'&description='.urlencode($_GET['description']):'').(!empty($_GET['source'])?'&source='.urlencode($_GET['source']):'')); exit; }
 447         if (isset($_POST['returnurl']))
 448         {
 449             if (endsWith($_POST['returnurl'],'?do=login')) { header('Location: ?'); exit; } // Prevent loops over login screen.
 450             header('Location: '.$_POST['returnurl']); exit;
 451         }
 452         header('Location: ?'); exit;
 453     }
 454     else
 455     {
 456         ban_loginFailed();
 457         $redir = '';
 458         if (isset($_GET['post'])) { $redir = '&post='.urlencode($_GET['post']).(!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').(!empty($_GET['description'])?'&description='.urlencode($_GET['description']):'').(!empty($_GET['source'])?'&source='.urlencode($_GET['source']):''); }
 459         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 460         exit;
 461     }
 462 }
 463
 464 // ------------------------------------------------------------------------------------------
 465 // Misc utility functions:
 466
 467 // Returns the server URL (including port and http/https), without path.
 468 // e.g. "http://myserver.com:8080"
 469 // You can append $_SERVER['SCRIPT_NAME'] to get the current script URL.
 470 function serverUrl()
 471 {
 472     $https = (!empty($_SERVER['HTTPS']) && (strtolower($_SERVER['HTTPS'])=='on')) || $_SERVER["SERVER_PORT"]=='443'; // HTTPS detection.
 473     $serverport = ($_SERVER["SERVER_PORT"]=='80' || ($https && $_SERVER["SERVER_PORT"]=='443') ? '' : ':'.$_SERVER["SERVER_PORT"]);
 474     return 'http'.($https?'s':'').'://'.$_SERVER['SERVER_NAME'].$serverport;
 475 }
 476
 477 // Returns the absolute URL of current script, without the query.
 478 // (e.g. http://sebsauvage.net/links/)
 479 function indexUrl()
 480 {
 481     $scriptname = $_SERVER["SCRIPT_NAME"];
 482     // If the script is named 'index.php', we remove it (for better looking URLs,
 483     // e.g. http://mysite.com/shaarli/?abcde instead of http://mysite.com/shaarli/index.php?abcde)
 484     if (endswith($scriptname,'index.php')) $scriptname = substr($scriptname,0,strlen($scriptname)-9);
 485     return serverUrl() . $scriptname;
 486 }
 487
 488 // Returns the absolute URL of current script, WITH the query.
 489 // (e.g. http://sebsauvage.net/links/?toto=titi&spamspamspam=humbug)
 490 function pageUrl()
 491 {
 492     return indexUrl().(!empty($_SERVER["QUERY_STRING"]) ? '?'.$_SERVER["QUERY_STRING"] : '');
 493 }
 494
 495 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 496 function return_bytes($val)
 497 {
 498     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 499     switch($last)
 500     {
 501         case 'g': $val *= 1024;
 502         case 'm': $val *= 1024;
 503         case 'k': $val *= 1024;
 504     }
 505     return $val;
 506 }
 507
 508 // Try to determine max file size for uploads (POST).
 509 // Returns an integer (in bytes)
 510 function getMaxFileSize()
 511 {
 512     $size1 = return_bytes(ini_get('post_max_size'));
 513     $size2 = return_bytes(ini_get('upload_max_filesize'));
 514     // Return the smaller of two:
 515     $maxsize = min($size1,$size2);
 516     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 517     return $maxsize;
 518 }
 519
 520 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 521     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 522     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 523 function linkdate2timestamp($linkdate)
 524 {
 525     if(strcmp($linkdate, '_000000') !== 0 || !$linkdate){
 526         $Y=$M=$D=$h=$m=$s=0;
 527         $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 528         return mktime($h,$m,$s,$M,$D,$Y);
 529     }
 530     return time();
 531 }
 532
 533 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 534     (used to build the pubDate attribute in RSS feed.)  */
 535 function linkdate2rfc822($linkdate)
 536 {
 537     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 538 }
 539
 540 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 541     (used to build the updated tags in ATOM feed.)  */
 542 function linkdate2iso8601($linkdate)
 543 {
 544     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 545 }
 546
 547 // Parse HTTP response headers and return an associative array.
 548 function http_parse_headers_shaarli( $headers )
 549 {
 550     $res=array();
 551     foreach($headers as $header)
 552     {
 553         $i = strpos($header,': ');
 554         if ($i!==false)
 555         {
 556             $key=substr($header,0,$i);
 557             $value=substr($header,$i+2,strlen($header)-$i-2);
 558             $res[$key]=$value;
 559         }
 560     }
 561     return $res;
 562 }
 563
 564 /* GET an URL.
 565    Input: $url : URL to get (http://...)
 566           $timeout : Network timeout (will wait this many seconds for an anwser before giving up).
 567    Output: An array.  [0] = HTTP status message (e.g. "HTTP/1.1 200 OK") or error message
 568                       [1] = associative array containing HTTP response headers (e.g. echo getHTTP($url)[1]['Content-Type'])
 569                       [2] = data
 570     Example: list($httpstatus,$headers,$data) = getHTTP('http://sebauvage.net/');
 571              if (strpos($httpstatus,'200 OK')!==false)
 572                  echo 'Data type: '.htmlspecialchars($headers['Content-Type']);
 573              else
 574                  echo 'There was an error: '.htmlspecialchars($httpstatus)
 575 */
 576 function getHTTP($url,$timeout=30)
 577 {
 578     try
 579     {
 580         $options = array('http'=>array('method'=>'GET','timeout' => $timeout, 'user_agent' => 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:23.0) Gecko/20100101 Firefox/23.0')); // Force network timeout
 581         $context = stream_context_create($options);
 582         $data=file_get_contents($url,false,$context,-1, 4000000); // We download at most 4 Mb from source.
 583         if (!$data) { return array('HTTP Error',array(),''); }
 584         $httpStatus=$http_response_header[0]; // e.g. "HTTP/1.1 200 OK"
 585         $responseHeaders=http_parse_headers_shaarli($http_response_header);
 586         return array($httpStatus,$responseHeaders,$data);
 587     }
 588     catch (Exception $e)  // getHTTP *can* fail silently (we don't care if the title cannot be fetched)
 589     {
 590         return array($e->getMessage(),'','');
 591     }
 592 }
 593
 594 // Extract title from an HTML document.
 595 // (Returns an empty string if not found.)
 596 function html_extract_title($html)
 597 {
 598   return preg_match('!<title>(.*?)</title>!is', $html, $matches) ? trim(str_replace("\n",' ', $matches[1])) : '' ;
 599 }
 600
 601 // ------------------------------------------------------------------------------------------
 602 // Token management for XSRF protection
 603 // Token should be used in any form which acts on data (create,update,delete,import...).
 604 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 605
 606 // Returns a token.
 607 function getToken()
 608 {
 609     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 610     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 611     return $rnd;
 612 }
 613
 614 // Tells if a token is OK. Using this function will destroy the token.
 615 // true=token is OK.
 616 function tokenOk($token)
 617 {
 618     if (isset($_SESSION['tokens'][$token]))
 619     {
 620         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 621         return true; // Token is OK.
 622     }
 623     return false; // Wrong token, or already used.
 624 }
 625
 626 // ------------------------------------------------------------------------------------------
 627 /* This class is in charge of building the final page.
 628    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 629    p = new pageBuilder;
 630    p.assign('myfield','myvalue');
 631    p.renderPage('mytemplate');
 632
 633 */
 634 class pageBuilder
 635 {
 636     private $tpl; // RainTPL template
 637
 638     function __construct()
 639     {
 640         $this->tpl=false;
 641     }
 642
 643     private function initialize()
 644     {
 645         $this->tpl = new RainTPL;
 646         $this->tpl->assign('newversion',escape(checkUpdate()));
 647         $this->tpl->assign('feedurl',escape(indexUrl()));
 648         $searchcrits=''; // Search criteria
 649         if (!empty($_GET['searchtags'])) $searchcrits.='&searchtags='.urlencode($_GET['searchtags']);
 650         elseif (!empty($_GET['searchterm'])) $searchcrits.='&searchterm='.urlencode($_GET['searchterm']);
 651         $this->tpl->assign('searchcrits',$searchcrits);
 652         $this->tpl->assign('source',indexUrl());
 653         $this->tpl->assign('version',shaarli_version);
 654         $this->tpl->assign('scripturl',indexUrl());
 655         $this->tpl->assign('pagetitle','Shaarli');
 656         $this->tpl->assign('privateonly',!empty($_SESSION['privateonly'])); // Show only private links?
 657         if (!empty($GLOBALS['title'])) $this->tpl->assign('pagetitle',$GLOBALS['title']);
 658         if (!empty($GLOBALS['titleLink'])) $this->tpl->assign('titleLink',$GLOBALS['titleLink']);
 659         if (!empty($GLOBALS['pagetitle'])) $this->tpl->assign('pagetitle',$GLOBALS['pagetitle']);
 660         $this->tpl->assign('shaarlititle',empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title'] );
 661         return;
 662     }
 663
 664     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 665     public function assign($what,$where)
 666     {
 667         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 668         $this->tpl->assign($what,$where);
 669     }
 670
 671     // Render a specific page (using a template).
 672     // e.g. pb.renderPage('picwall')
 673     public function renderPage($page)
 674     {
 675         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 676         $this->tpl->draw($page);
 677     }
 678 }
 679
 680 // ------------------------------------------------------------------------------------------
 681 // Output the last N links in RSS 2.0 format.
 682 function showRSS()
 683 {
 684     header('Content-Type: application/rss+xml; charset=utf-8');
 685
 686     // $usepermalink : If true, use permalink instead of final link.
 687     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=rss&permalinks
 688     // Also enabled through a config option
 689     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 690
 691     // Cache system
 692     $query = $_SERVER["QUERY_STRING"];
 693     $cache = new pageCache(pageUrl(),startsWith($query,'do=rss') && !isLoggedIn());
 694     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
 695
 696     // If cached was not found (or not usable), then read the database and build the response:
 697     $LINKSDB = new LinkDB(
 698         $GLOBALS['config']['DATASTORE'],
 699         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 700         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 701     );
 702     // Read links from database (and filter private links if user it not logged in).
 703
 704     // Optionally filter the results:
 705     $linksToDisplay=array();
 706     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 707     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 708     else $linksToDisplay = $LINKSDB;
 709
 710     $nblinksToDisplay = 50;  // Number of links to display.
 711     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 712     {
 713         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 714     }
 715
 716     $pageaddr=escape(indexUrl());
 717     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 718     echo '<channel><title>'.$GLOBALS['title'].'</title><link>'.$pageaddr.'</link>';
 719     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 720     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 721     {
 722         echo '<!-- PubSubHubbub Discovery -->';
 723         echo '<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 724         echo '<link rel="self" href="'.$pageaddr.'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 725         echo '<!-- End Of PubSubHubbub Discovery -->';
 726     }
 727     $i=0;
 728     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 729     while ($i<$nblinksToDisplay && $i<count($keys))
 730     {
 731         $link = $linksToDisplay[$keys[$i]];
 732         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 733         $rfc822date = linkdate2rfc822($link['linkdate']);
 734         $absurl = $link['url'];
 735         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 736         if ($usepermalinks===true)
 737             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 738         else
 739             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 740         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.escape($rfc822date)."</pubDate>\n";
 741         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 742         {
 743             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.$pageaddr.'">'.$tag.'</category>'."\n"; }
 744         }
 745
 746         // Add permalink in description
 747         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 748         // If user wants permalinks first, put the final link in description
 749         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 750         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 751         echo '<description><![CDATA['.nl2br(keepMultipleSpaces(text2clickable($link['description']))).$descriptionlink.']]></description>'."\n</item>\n";
 752         $i++;
 753     }
 754     echo '</channel></rss><!-- Cached version of '.escape(pageUrl()).' -->';
 755
 756     $cache->cache(ob_get_contents());
 757     ob_end_flush();
 758     exit;
 759 }
 760
 761 // ------------------------------------------------------------------------------------------
 762 // Output the last N links in ATOM format.
 763 function showATOM()
 764 {
 765     header('Content-Type: application/atom+xml; charset=utf-8');
 766
 767     // $usepermalink : If true, use permalink instead of final link.
 768     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
 769     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 770
 771     // Cache system
 772     $query = $_SERVER["QUERY_STRING"];
 773     $cache = new pageCache(pageUrl(),startsWith($query,'do=atom') && !isLoggedIn());
 774     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
 775     // If cached was not found (or not usable), then read the database and build the response:
 776
 777 // Read links from database (and filter private links if used it not logged in).
 778     $LINKSDB = new LinkDB(
 779         $GLOBALS['config']['DATASTORE'],
 780         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 781         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 782     );
 783
 784     // Optionally filter the results:
 785     $linksToDisplay=array();
 786     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 787     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 788     else $linksToDisplay = $LINKSDB;
 789
 790     $nblinksToDisplay = 50;  // Number of links to display.
 791     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 792     {
 793         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 794     }
 795
 796     $pageaddr=escape(indexUrl());
 797     $latestDate = '';
 798     $entries='';
 799     $i=0;
 800     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 801     while ($i<$nblinksToDisplay && $i<count($keys))
 802     {
 803         $link = $linksToDisplay[$keys[$i]];
 804         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 805         $iso8601date = linkdate2iso8601($link['linkdate']);
 806         $latestDate = max($latestDate,$iso8601date);
 807         $absurl = $link['url'];
 808         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 809         $entries.='<entry><title>'.$link['title'].'</title>';
 810         if ($usepermalinks===true)
 811             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
 812         else
 813             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
 814         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.escape($iso8601date).'</updated>';
 815
 816         // Add permalink in description
 817         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 818         // If user wants permalinks first, put the final link in description
 819         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 820         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 821
 822         $entries.='<content type="html"><![CDATA['.nl2br(keepMultipleSpaces(text2clickable($link['description']))).$descriptionlink."]]></content>\n";
 823         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
 824         {
 825             foreach(explode(' ',$link['tags']) as $tag)
 826                 { $entries.='<category scheme="'.$pageaddr.'" term="'.$tag.'" />'."\n"; }
 827         }
 828         $entries.="</entry>\n";
 829         $i++;
 830     }
 831     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
 832     $feed.='<title>'.$GLOBALS['title'].'</title>';
 833     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.escape($latestDate).'</updated>';
 834     $feed.='<link rel="self" href="'.escape(serverUrl().$_SERVER["REQUEST_URI"]).'" />';
 835     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 836     {
 837         $feed.='<!-- PubSubHubbub Discovery -->';
 838         $feed.='<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
 839         $feed.='<!-- End Of PubSubHubbub Discovery -->';
 840     }
 841     $feed.='<author><name>'.$pageaddr.'</name><uri>'.$pageaddr.'</uri></author>';
 842     $feed.='<id>'.$pageaddr.'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
 843     $feed.=$entries;
 844     $feed.='</feed><!-- Cached version of '.escape(pageUrl()).' -->';
 845     echo $feed;
 846
 847     $cache->cache(ob_get_contents());
 848     ob_end_flush();
 849     exit;
 850 }
 851
 852 // ------------------------------------------------------------------------------------------
 853 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 854 // Gives the last 7 days (which have links).
 855 // This RSS feed cannot be filtered.
 856 function showDailyRSS() {
 857     // Cache system
 858     $query = $_SERVER["QUERY_STRING"];
 859     $cache = new pageCache(pageUrl(), startsWith($query, 'do=dailyrss') && !isLoggedIn());
 860     $cached = $cache->cachedVersion();
 861     if (!empty($cached)) {
 862         echo $cached;
 863         exit;
 864     }
 865
 866     // If cached was not found (or not usable), then read the database and build the response:
 867     // Read links from database (and filter private links if used it not logged in).
 868     $LINKSDB = new LinkDB(
 869         $GLOBALS['config']['DATASTORE'],
 870         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 871         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 872     );
 873
 874     /* Some Shaarlies may have very few links, so we need to look
 875        back in time (rsort()) until we have enough days ($nb_of_days).
 876     */
 877     $linkdates = array();
 878     foreach ($LINKSDB as $linkdate => $value) {
 879         $linkdates[] = $linkdate;
 880     }
 881     rsort($linkdates);
 882     $nb_of_days = 7; // We take 7 days.
 883     $today = Date('Ymd');
 884     $days = array();
 885
 886     foreach ($linkdates as $linkdate) {
 887         $day = substr($linkdate, 0, 8); // Extract day (without time)
 888         if (strcmp($day,$today) < 0) {
 889             if (empty($days[$day])) {
 890                 $days[$day] = array();
 891             }
 892             $days[$day][] = $linkdate;
 893         }
 894
 895         if (count($days) > $nb_of_days) {
 896             break; // Have we collected enough days?
 897         }
 898     }
 899
 900     // Build the RSS feed.
 901     header('Content-Type: application/rss+xml; charset=utf-8');
 902     $pageaddr = escape(indexUrl());
 903     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 904     echo '<channel>';
 905     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 906     echo '<link>'. $pageaddr .'</link>';
 907     echo '<description>Daily shared links</description>';
 908     echo '<language>en-en</language>';
 909     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 910
 911     // For each day.
 912     foreach ($days as $day => $linkdates) {
 913         $daydate = linkdate2timestamp($day.'_000000'); // Full text date
 914         $rfc822date = linkdate2rfc822($day.'_000000');
 915         $absurl = escape(indexUrl().'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 916
 917         // Build the HTML body of this RSS entry.
 918         $html = '';
 919         $href = '';
 920         $links = array();
 921
 922         // We pre-format some fields for proper output.
 923         foreach ($linkdates as $linkdate) {
 924             $l = $LINKSDB[$linkdate];
 925             $l['formatedDescription'] = nl2br(keepMultipleSpaces(text2clickable($l['description'])));
 926             $l['thumbnail'] = thumbnail($l['url']);
 927             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
 928             if (startsWith($l['url'], '?')) {
 929                 $l['url'] = indexUrl() . $l['url'];  // make permalink URL absolute
 930             }
 931             $links[$linkdate] = $l;
 932         }
 933
 934         // Then build the HTML for this day:
 935         $tpl = new RainTPL;
 936         $tpl->assign('title', $GLOBALS['title']);
 937         $tpl->assign('daydate', $daydate);
 938         $tpl->assign('absurl', $absurl);
 939         $tpl->assign('links', $links);
 940         $tpl->assign('rfc822date', escape($rfc822date));
 941         $html = $tpl->draw('dailyrss', $return_string=true);
 942
 943         echo $html . PHP_EOL;
 944     }
 945     echo '</channel></rss><!-- Cached version of '. escape(pageUrl()) .' -->';
 946
 947     $cache->cache(ob_get_contents());
 948     ob_end_flush();
 949     exit;
 950 }
 951
 952 // "Daily" page.
 953 function showDaily()
 954 {
 955     $LINKSDB = new LinkDB(
 956         $GLOBALS['config']['DATASTORE'],
 957         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 958         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 959     );
 960
 961     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 962     if (isset($_GET['day'])) $day=$_GET['day'];
 963
 964     $days = $LINKSDB->days();
 965     $i = array_search($day,$days);
 966     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
 967     $previousday='';
 968     $nextday='';
 969     if ($i!==false)
 970     {
 971         if ($i>=1) $previousday=$days[$i-1];
 972         if ($i<count($days)-1) $nextday=$days[$i+1];
 973     }
 974
 975     try {
 976         $linksToDisplay = $LINKSDB->filterDay($day);
 977     } catch (Exception $exc) {
 978         error_log($exc);
 979         $linksToDisplay = [];
 980     }
 981
 982     // We pre-format some fields for proper output.
 983     foreach($linksToDisplay as $key=>$link)
 984     {
 985
 986         $taglist = explode(' ',$link['tags']);
 987         uasort($taglist, 'strcasecmp');
 988         $linksToDisplay[$key]['taglist']=$taglist;
 989         $linksToDisplay[$key]['formatedDescription']=nl2br(keepMultipleSpaces(text2clickable($link['description'])));
 990         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
 991         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
 992     }
 993
 994     /* We need to spread the articles on 3 columns.
 995        I did not want to use a JavaScript lib like http://masonry.desandro.com/
 996        so I manually spread entries with a simple method: I roughly evaluate the
 997        height of a div according to title and description length.
 998     */
 999     $columns=array(array(),array(),array()); // Entries to display, for each column.
1000     $fill=array(0,0,0);  // Rough estimate of columns fill.
1001     foreach($linksToDisplay as $key=>$link)
1002     {
1003         // Roughly estimate length of entry (by counting characters)
1004         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
1005         // Description: 836 characters gives roughly 342 pixel height.
1006         // This is not perfect, but it's usually OK.
1007         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
1008         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
1009         // Then put in column which is the less filled:
1010         $smallest=min($fill); // find smallest value in array.
1011         $index=array_search($smallest,$fill); // find index of this smallest value.
1012         array_push($columns[$index],$link); // Put entry in this column.
1013         $fill[$index]+=$length;
1014     }
1015     $PAGE = new pageBuilder;
1016     $PAGE->assign('linksToDisplay',$linksToDisplay);
1017     $PAGE->assign('linkcount',count($LINKSDB));
1018     $PAGE->assign('cols', $columns);
1019     $PAGE->assign('day',linkdate2timestamp($day.'_000000'));
1020     $PAGE->assign('previousday',$previousday);
1021     $PAGE->assign('nextday',$nextday);
1022     $PAGE->renderPage('daily');
1023     exit;
1024 }
1025
1026
1027 // ------------------------------------------------------------------------------------------
1028 // Render HTML page (according to URL parameters and user rights)
1029 function renderPage()
1030 {
1031     $LINKSDB = new LinkDB(
1032         $GLOBALS['config']['DATASTORE'],
1033         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
1034         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
1035     );
1036
1037     // -------- Display login form.
1038     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=login'))
1039     {
1040         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1041         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1042         $PAGE = new pageBuilder;
1043         $PAGE->assign('token',$token);
1044         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
1045         $PAGE->renderPage('loginform');
1046         exit;
1047     }
1048     // -------- User wants to logout.
1049     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1050     {
1051         invalidateCaches();
1052         logout();
1053         header('Location: ?');
1054         exit;
1055     }
1056
1057     // -------- Picture wall
1058     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=picwall'))
1059     {
1060         // Optionally filter the results:
1061         $links=array();
1062         if (!empty($_GET['searchterm'])) $links = $LINKSDB->filterFulltext($_GET['searchterm']);
1063         elseif (!empty($_GET['searchtags']))   $links = $LINKSDB->filterTags(trim($_GET['searchtags']));
1064         else $links = $LINKSDB;
1065
1066         $body='';
1067         $linksToDisplay=array();
1068
1069         // Get only links which have a thumbnail.
1070         foreach($links as $link)
1071         {
1072             $permalink='?'.escape(smallhash($link['linkdate']));
1073             $thumb=lazyThumbnail($link['url'],$permalink);
1074             if ($thumb!='') // Only output links which have a thumbnail.
1075             {
1076                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1077                 $linksToDisplay[]=$link; // Add to array.
1078             }
1079         }
1080
1081         $PAGE = new pageBuilder;
1082         $PAGE->assign('linkcount',count($LINKSDB));
1083         $PAGE->assign('linksToDisplay',$linksToDisplay);
1084         $PAGE->renderPage('picwall');
1085         exit;
1086     }
1087
1088     // -------- Tag cloud
1089     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tagcloud'))
1090     {
1091         $tags= $LINKSDB->allTags();
1092
1093         // We sort tags alphabetically, then choose a font size according to count.
1094         // First, find max value.
1095         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1096         ksort($tags);
1097         $tagList=array();
1098         foreach($tags as $key=>$value)
1099         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1100         {
1101             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1102         }
1103         $PAGE = new pageBuilder;
1104         $PAGE->assign('linkcount',count($LINKSDB));
1105         $PAGE->assign('tags',$tagList);
1106         $PAGE->renderPage('tagcloud');
1107         exit;
1108     }
1109
1110     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1111     if (isset($_GET['addtag']))
1112     {
1113         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1114         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1115         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1116
1117         // Check if this tag is already in the search query and ignore it if it is.
1118         // Each tag is always separated by a space
1119         $current_tags = explode(' ', $params['searchtags']);
1120         $addtag = true;
1121         foreach ($current_tags as $value) {
1122             if ($value === $_GET['addtag']) {
1123                 $addtag = false;
1124                 break;
1125             }
1126         }
1127         // Append the tag if necessary
1128         if (empty($params['searchtags'])) {
1129             $params['searchtags'] = trim($_GET['addtag']);
1130         }
1131         else if ($addtag) {
1132             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1133         }
1134
1135         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1136         header('Location: ?'.http_build_query($params));
1137         exit;
1138     }
1139
1140     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1141     if (isset($_GET['removetag']))
1142     {
1143         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1144         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?'); exit; } // In case browser does not send HTTP_REFERER
1145         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1146         if (isset($params['searchtags']))
1147         {
1148             $tags = explode(' ',$params['searchtags']);
1149             $tags=array_diff($tags, array($_GET['removetag'])); // Remove value from array $tags.
1150             if (count($tags)==0) unset($params['searchtags']); else $params['searchtags'] = implode(' ',$tags);
1151             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1152         }
1153         header('Location: ?'.http_build_query($params));
1154         exit;
1155     }
1156
1157     // -------- User wants to change the number of links per page (linksperpage=...)
1158     if (isset($_GET['linksperpage']))
1159     {
1160         if (is_numeric($_GET['linksperpage'])) { $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage'])); }
1161         // Make sure the referrer is Shaarli itself.
1162         $referer = '?';
1163         if (!empty($_SERVER['HTTP_REFERER']) && strcmp(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST),$_SERVER['HTTP_HOST'])==0)
1164             $referer = $_SERVER['HTTP_REFERER'];
1165         header('Location: '.$referer);
1166         exit;
1167     }
1168
1169     // -------- User wants to see only private links (toggle)
1170     if (isset($_GET['privateonly']))
1171     {
1172         if (empty($_SESSION['privateonly']))
1173         {
1174             $_SESSION['privateonly']=1; // See only private links
1175         }
1176         else
1177         {
1178             unset($_SESSION['privateonly']); // See all links
1179         }
1180         // Make sure the referrer is Shaarli itself.
1181         $referer = '?';
1182         if (!empty($_SERVER['HTTP_REFERER']) && strcmp(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST),$_SERVER['HTTP_HOST'])==0)
1183             $referer = $_SERVER['HTTP_REFERER'];
1184         header('Location: '.$referer);
1185         exit;
1186     }
1187
1188     // -------- Handle other actions allowed for non-logged in users:
1189     if (!isLoggedIn())
1190     {
1191         // User tries to post new link but is not logged in:
1192         // Show login screen, then redirect to ?post=...
1193         if (isset($_GET['post']))
1194         {
1195             header('Location: ?do=login&post='.urlencode($_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.
1196             exit;
1197         }
1198
1199                 // Same case as above except that user tried to access ?do=addlink without being logged in
1200                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1201                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1202                         header('Location: ?do=login&post=');
1203                         exit;
1204                 }
1205
1206         $PAGE = new pageBuilder;
1207         buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1208         $PAGE->renderPage('linklist');
1209         exit; // Never remove this one! All operations below are reserved for logged in user.
1210     }
1211
1212     // -------- All other functions are reserved for the registered user:
1213
1214     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1215     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tools'))
1216     {
1217         $PAGE = new pageBuilder;
1218         $PAGE->assign('linkcount',count($LINKSDB));
1219         $PAGE->assign('pageabsaddr',indexUrl());
1220         $PAGE->renderPage('tools');
1221         exit;
1222     }
1223
1224     // -------- User wants to change his/her password.
1225     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changepasswd'))
1226     {
1227         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1228         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1229         {
1230             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1231
1232             // Make sure old password is correct.
1233             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1234             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1235             // Save new password
1236             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1237             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1238             try {
1239                 writeConfig($GLOBALS, isLoggedIn());
1240             }
1241             catch(Exception $e) {
1242                 error_log(
1243                     'ERROR while writing config file after changing password.' . PHP_EOL .
1244                     $e->getMessage()
1245                 );
1246
1247                 // TODO: do not handle exceptions/errors in JS.
1248                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1249                 exit;
1250             }
1251             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1252             exit;
1253         }
1254         else // show the change password form.
1255         {
1256             $PAGE = new pageBuilder;
1257             $PAGE->assign('linkcount',count($LINKSDB));
1258             $PAGE->assign('token',getToken());
1259             $PAGE->renderPage('changepassword');
1260             exit;
1261         }
1262     }
1263
1264     // -------- User wants to change configuration
1265     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=configure'))
1266     {
1267         if (!empty($_POST['title']) )
1268         {
1269             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1270             $tz = 'UTC';
1271             if (!empty($_POST['continent']) && !empty($_POST['city']))
1272                 if (isTZvalid($_POST['continent'],$_POST['city']))
1273                     $tz = $_POST['continent'].'/'.$_POST['city'];
1274             $GLOBALS['timezone'] = $tz;
1275             $GLOBALS['title']=$_POST['title'];
1276             $GLOBALS['titleLink']=$_POST['titleLink'];
1277             $GLOBALS['redirector']=$_POST['redirector'];
1278             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1279             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1280             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1281             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1282             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1283             try {
1284                 writeConfig($GLOBALS, isLoggedIn());
1285             }
1286             catch(Exception $e) {
1287                 error_log(
1288                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1289                     $e->getMessage()
1290                 );
1291
1292                 // TODO: do not handle exceptions/errors in JS.
1293                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1294                 exit;
1295             }
1296             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1297             exit;
1298         }
1299         else // Show the configuration form.
1300         {
1301             $PAGE = new pageBuilder;
1302             $PAGE->assign('linkcount',count($LINKSDB));
1303             $PAGE->assign('token',getToken());
1304             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1305             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1306             list($timezone_form,$timezone_js) = templateTZform($GLOBALS['timezone']);
1307             $PAGE->assign('timezone_form',$timezone_form); // FIXME: Put entire tz form generation in template?
1308             $PAGE->assign('timezone_js',$timezone_js);
1309             $PAGE->renderPage('configure');
1310             exit;
1311         }
1312     }
1313
1314     // -------- User wants to rename a tag or delete it
1315     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changetag'))
1316     {
1317         if (empty($_POST['fromtag']))
1318         {
1319             $PAGE = new pageBuilder;
1320             $PAGE->assign('linkcount',count($LINKSDB));
1321             $PAGE->assign('token',getToken());
1322             $PAGE->assign('tags', $LINKSDB->allTags());
1323             $PAGE->renderPage('changetag');
1324             exit;
1325         }
1326         if (!tokenOk($_POST['token'])) die('Wrong token.');
1327
1328         // Delete a tag:
1329         if (!empty($_POST['deletetag']) && !empty($_POST['fromtag']))
1330         {
1331             $needle=trim($_POST['fromtag']);
1332             $linksToAlter = $LINKSDB->filterTags($needle,true); // True for case-sensitive tag search.
1333             foreach($linksToAlter as $key=>$value)
1334             {
1335                 $tags = explode(' ',trim($value['tags']));
1336                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1337                 $value['tags']=trim(implode(' ',$tags));
1338                 $LINKSDB[$key]=$value;
1339             }
1340             $LINKSDB->savedb(); // Save to disk.
1341             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1342             exit;
1343         }
1344
1345         // Rename a tag:
1346         if (!empty($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag']))
1347         {
1348             $needle=trim($_POST['fromtag']);
1349             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
1350             foreach($linksToAlter as $key=>$value)
1351             {
1352                 $tags = explode(' ',trim($value['tags']));
1353                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1354                 $value['tags']=trim(implode(' ',$tags));
1355                 $LINKSDB[$key]=$value;
1356             }
1357             $LINKSDB->savedb(); // Save to disk.
1358             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1359             exit;
1360         }
1361     }
1362
1363     // -------- User wants to add a link without using the bookmarklet: Show form.
1364     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=addlink'))
1365     {
1366         $PAGE = new pageBuilder;
1367         $PAGE->assign('linkcount',count($LINKSDB));
1368         $PAGE->renderPage('addlink');
1369         exit;
1370     }
1371
1372     // -------- User clicked the "Save" button when editing a link: Save link to database.
1373     if (isset($_POST['save_edit']))
1374     {
1375         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1376         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1377         $linkdate=$_POST['lf_linkdate'];
1378         $url = trim($_POST['lf_url']);
1379         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?') && !startsWith($url,'javascript:'))
1380             $url = 'http://'.$url;
1381         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1382                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1383         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1384         $LINKSDB[$linkdate] = $link;
1385         $LINKSDB->savedb(); // Save to disk.
1386         pubsubhub();
1387
1388         // If we are called from the bookmarklet, we must close the popup:
1389         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1390         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1391         $returnurl .= '#'.smallHash($linkdate);  // Scroll to the link which has been edited.
1392         if (strstr($returnurl, "do=addlink")) { $returnurl = '?'; } //if we come from ?do=addlink, set returnurl to homepage instead
1393         header('Location: '.$returnurl); // After saving the link, redirect to the page the user was on.
1394         exit;
1395     }
1396
1397     // -------- User clicked the "Cancel" button when editing a link.
1398     if (isset($_POST['cancel_edit']))
1399     {
1400         // If we are called from the bookmarklet, we must close the popup:
1401         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1402         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1403         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1404         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1405         exit;
1406     }
1407
1408     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1409     if (isset($_POST['delete_link']))
1410     {
1411         if (!tokenOk($_POST['token'])) die('Wrong token.');
1412         // We do not need to ask for confirmation:
1413         // - confirmation is handled by JavaScript
1414         // - we are protected from XSRF by the token.
1415         $linkdate=$_POST['lf_linkdate'];
1416         unset($LINKSDB[$linkdate]);
1417         $LINKSDB->savedb(); // save to disk
1418
1419         // If we are called from the bookmarklet, we must close the popup:
1420         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1421         // Pick where we're going to redirect
1422         // =============================================================
1423         // Basically, we can't redirect to where we were previously if it was a permalink
1424         // or an edit_link, because it would 404.
1425         // Cases:
1426         //    - /             : nothing in $_GET, redirect to self
1427         //    - /?page        : redirect to self
1428         //    - /?searchterm  : redirect to self (there might be other links)
1429         //    - /?searchtags  : redirect to self
1430         //    - /permalink    : redirect to / (the link does not exist anymore)
1431         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1432         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1433         // redirect is not satisfied, and only then redirect to /
1434         $location = "?";
1435         // Self redirection
1436         if (count($_GET) == 0    ||
1437             isset($_GET['page']) ||
1438             isset($_GET['searchterm']) ||
1439             isset($_GET['searchtags'])) {
1440
1441             if (isset($_POST['returnurl'])) {
1442                 $location = $_POST['returnurl']; // Handle redirects given by the form
1443             }
1444
1445             if ($location === "?" &&
1446                 isset($_SERVER['HTTP_REFERER'])) { // Handle HTTP_REFERER in case we're not coming from the same place.
1447                 $location = $_SERVER['HTTP_REFERER'];
1448             }
1449         }
1450
1451         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1452         exit;
1453     }
1454
1455     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1456     if (isset($_GET['edit_link']))
1457     {
1458         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1459         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1460         $PAGE = new pageBuilder;
1461         $PAGE->assign('linkcount',count($LINKSDB));
1462         $PAGE->assign('link',$link);
1463         $PAGE->assign('link_is_new',false);
1464         $PAGE->assign('token',getToken()); // XSRF protection.
1465         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''));
1466         $PAGE->assign('tags', $LINKSDB->allTags());
1467         $PAGE->renderPage('editlink');
1468         exit;
1469     }
1470
1471     // -------- User want to post a new link: Display link edit form.
1472     if (isset($_GET['post']))
1473     {
1474         $url=$_GET['post'];
1475
1476
1477         // We remove the annoying parameters added by FeedBurner, GoogleFeedProxy, Facebook...
1478         $annoyingpatterns = array('/[\?&]utm_source=[^&]*/',
1479             '/[\?&]utm_campaign=[^&]*/',
1480             '/[\?&]utm_medium=[^&]*/',
1481             '/#xtor=RSS-[^&]*/',
1482             '/[\?&]fb_[^&]*/',
1483             '/[\?&]__scoop[^&]*/',
1484             '/#tk\.rss_all\?/',
1485             '/[\?&]action_ref_map=[^&]*/',
1486             '/[\?&]action_type_map=[^&]*/',
1487             '/[\?&]action_object_map=[^&]*/',
1488             '/[\?&]utm_content=[^&]*/',
1489             '/[\?&]fb=[^&]*/',
1490             '/[\?&]xtor=[^&]*/'
1491             );
1492         foreach($annoyingpatterns as $pattern)
1493         {
1494             $url = preg_replace($pattern, "", $url);
1495         }
1496
1497         $link_is_new = false;
1498         $link = $LINKSDB->getLinkFromUrl($url); // Check if URL is not already in database (in this case, we will edit the existing link)
1499         if (!$link)
1500         {
1501             $link_is_new = true;  // This is a new link
1502             $linkdate = strval(date('Ymd_His'));
1503             $title = (empty($_GET['title']) ? '' : $_GET['title'] ); // Get title if it was provided in URL (by the bookmarklet).
1504             $description = (empty($_GET['description']) ? '' : $_GET['description']); // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1505             $tags = (empty($_GET['tags']) ? '' : $_GET['tags'] ); // Get tags if it was provided in URL
1506             $private = (!empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0); // Get private if it was provided in URL
1507             if (($url!='') && parse_url($url,PHP_URL_SCHEME)=='') $url = 'http://'.$url;
1508             // If this is an HTTP link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1509             if (empty($title) && parse_url($url,PHP_URL_SCHEME)=='http')
1510             {
1511                 list($status,$headers,$data) = getHTTP($url,4); // Short timeout to keep the application responsive.
1512                 // FIXME: Decode charset according to specified in either 1) HTTP response headers or 2) <head> in html
1513                 if (strpos($status,'200 OK')!==false)
1514                                          {
1515                         // Look for charset in html header.
1516                                                 preg_match('#<meta .*charset=.*>#Usi', $data, $meta);
1517
1518                                                 // If found, extract encoding.
1519                                                 if (!empty($meta[0]))
1520                                                 {
1521                                                         // Get encoding specified in header.
1522                                                         preg_match('#charset="?(.*)"#si', $meta[0], $enc);
1523                                                         // If charset not found, use utf-8.
1524                                                         $html_charset = (!empty($enc[1])) ? strtolower($enc[1]) : 'utf-8';
1525                                                 }
1526                                                 else { $html_charset = 'utf-8'; }
1527
1528                                                 // Extract title
1529                                                 $title = html_extract_title($data);
1530                                                 if (!empty($title))
1531                                                 {
1532                                                         // Re-encode title in utf-8 if necessary.
1533                                                         $title = ($html_charset == 'iso-8859-1') ? utf8_encode($title) : $title;
1534                                                 }
1535                                         }
1536             }
1537             if ($url=='') // In case of empty URL, this is just a text (with a link that points to itself)
1538             {
1539                 $url='?'.smallHash($linkdate);
1540                 $title='Note: ';
1541             }
1542             $link = array('linkdate'=>$linkdate,'title'=>$title,'url'=>$url,'description'=>$description,'tags'=>$tags,'private'=>$private);
1543         }
1544
1545         $PAGE = new pageBuilder;
1546         $PAGE->assign('linkcount',count($LINKSDB));
1547         $PAGE->assign('link',$link);
1548         $PAGE->assign('link_is_new',$link_is_new);
1549         $PAGE->assign('token',getToken()); // XSRF protection.
1550         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : ''));
1551         $PAGE->assign('source',(isset($_GET['source']) ? $_GET['source'] : ''));
1552         $PAGE->assign('tags', $LINKSDB->allTags());
1553         $PAGE->renderPage('editlink');
1554         exit;
1555     }
1556
1557     // -------- Export as Netscape Bookmarks HTML file.
1558     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=export'))
1559     {
1560         if (empty($_GET['what']))
1561         {
1562             $PAGE = new pageBuilder;
1563             $PAGE->assign('linkcount',count($LINKSDB));
1564             $PAGE->renderPage('export');
1565             exit;
1566         }
1567         $exportWhat=$_GET['what'];
1568         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1569
1570         header('Content-Type: text/html; charset=utf-8');
1571         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1572         $currentdate=date('Y/m/d H:i:s');
1573         echo <<<HTML
1574 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1575 <!-- This is an automatically generated file.
1576      It will be read and overwritten.
1577      DO NOT EDIT! -->
1578 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1579 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1580 <TITLE>Bookmarks</TITLE>
1581 <H1>Bookmarks</H1>
1582 HTML;
1583         foreach($LINKSDB as $link)
1584         {
1585             if ($exportWhat=='all' ||
1586                ($exportWhat=='private' && $link['private']!=0) ||
1587                ($exportWhat=='public' && $link['private']==0))
1588             {
1589                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1590                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1591                 echo '>'.$link['title']."</A>\n";
1592                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1593             }
1594         }
1595                 exit;
1596     }
1597
1598     // -------- User is uploading a file for import
1599     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1600     {
1601         // If file is too big, some form field may be missing.
1602         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1603         {
1604             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1605             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1606             exit;
1607         }
1608         if (!tokenOk($_POST['token'])) die('Wrong token.');
1609         importFile();
1610         exit;
1611     }
1612
1613     // -------- Show upload/import dialog:
1614     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=import'))
1615     {
1616         $PAGE = new pageBuilder;
1617         $PAGE->assign('linkcount',count($LINKSDB));
1618         $PAGE->assign('token',getToken());
1619         $PAGE->assign('maxfilesize',getMaxFileSize());
1620         $PAGE->renderPage('import');
1621         exit;
1622     }
1623
1624     // -------- Otherwise, simply display search form and links:
1625     $PAGE = new pageBuilder;
1626     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1627     $PAGE->renderPage('linklist');
1628     exit;
1629 }
1630
1631 // -----------------------------------------------------------------------------------------------
1632 // Process the import file form.
1633 function importFile()
1634 {
1635     if (!(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'])) { die('Not allowed.'); }
1636     $LINKSDB = new LinkDB(
1637         $GLOBALS['config']['DATASTORE'],
1638         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
1639         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
1640     );
1641     $filename=$_FILES['filetoupload']['name'];
1642     $filesize=$_FILES['filetoupload']['size'];
1643     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1644     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1645     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1646     $import_count=0;
1647
1648     // Sniff file type:
1649     $type='unknown';
1650     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1651
1652     // Then import the bookmarks.
1653     if ($type=='netscape')
1654     {
1655         // This is a standard Netscape-style bookmark file.
1656         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1657         foreach(explode('<DT>',$data) as $html) // explode is very fast
1658         {
1659             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1660             $d = explode('<DD>',$html);
1661             if (startswith($d[0],'<A '))
1662             {
1663                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1664                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1665                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1666                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1667                 $raw_add_date=0;
1668                 foreach($matches as $m)
1669                 {
1670                     $attr=$m[1]; $value=$m[2];
1671                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1672                     elseif ($attr=='ADD_DATE')
1673                     {
1674                         $raw_add_date=intval($value);
1675                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1676                     }
1677                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1678                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1679                 }
1680                 if ($link['url']!='')
1681                 {
1682                     if ($private==1) $link['private']=1;
1683                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1684                     if ($dblink==false)
1685                     {  // Link not in database, let's import it...
1686                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1687
1688                        // Make sure date/time is not already used by another link.
1689                        // (Some bookmark files have several different links with the same ADD_DATE)
1690                        // We increment date by 1 second until we find a date which is not used in DB.
1691                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1692                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1693                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1694                        $LINKSDB[$link['linkdate']] = $link;
1695                        $import_count++;
1696                     }
1697                     else // Link already present in database.
1698                     {
1699                         if ($overwrite)
1700                         {   // If overwrite is required, we import link data, except date/time.
1701                             $link['linkdate']=$dblink['linkdate'];
1702                             $LINKSDB[$link['linkdate']] = $link;
1703                             $import_count++;
1704                         }
1705                     }
1706
1707                 }
1708             }
1709         }
1710         $LINKSDB->savedb();
1711
1712         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1713     }
1714     else
1715     {
1716         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1717     }
1718 }
1719
1720 // -----------------------------------------------------------------------------------------------
1721 // Template for the list of links (<div id="linklist">)
1722 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1723 function buildLinkList($PAGE,$LINKSDB)
1724 {
1725     // ---- Filter link database according to parameters
1726     $linksToDisplay=array();
1727     $search_type='';
1728     $search_crits='';
1729     if (isset($_GET['searchterm'])) // Fulltext search
1730     {
1731         $linksToDisplay = $LINKSDB->filterFulltext(trim($_GET['searchterm']));
1732         $search_crits=escape(trim($_GET['searchterm']));
1733         $search_type='fulltext';
1734     }
1735     elseif (isset($_GET['searchtags'])) // Search by tag
1736     {
1737         $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
1738         $search_crits=explode(' ',escape(trim($_GET['searchtags'])));
1739         $search_type='tags';
1740     }
1741     elseif (isset($_SERVER['QUERY_STRING']) && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/',$_SERVER['QUERY_STRING'])) // Detect smallHashes in URL
1742     {
1743         $linksToDisplay = $LINKSDB->filterSmallHash(substr(trim($_SERVER["QUERY_STRING"], '/'),0,6));
1744         if (count($linksToDisplay)==0)
1745         {
1746             header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
1747             echo '<h1>404 Not found.</h1>Oh crap. The link you are trying to reach does not exist or has been deleted.';
1748             echo '<br>You would mind <a href="?">clicking here</a>?';
1749             exit;
1750         }
1751         $search_type='permalink';
1752     }
1753     else
1754         $linksToDisplay = $LINKSDB;  // Otherwise, display without filtering.
1755
1756
1757     // Option: Show only private links
1758     if (!empty($_SESSION['privateonly']))
1759     {
1760         $tmp = array();
1761         foreach($linksToDisplay as $linkdate=>$link)
1762         {
1763             if ($link['private']!=0) $tmp[$linkdate]=$link;
1764         }
1765         $linksToDisplay=$tmp;
1766     }
1767
1768     // ---- Handle paging.
1769     /* Can someone explain to me why you get the following error when using array_keys() on an object which implements the interface ArrayAccess???
1770        "Warning: array_keys() expects parameter 1 to be array, object given in ... "
1771        If my class implements ArrayAccess, why won't array_keys() accept it ?  ( $keys=array_keys($linksToDisplay); )
1772     */
1773     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; } // Stupid and ugly. Thanks PHP.
1774
1775     // If there is only a single link, we change on-the-fly the title of the page.
1776     if (count($linksToDisplay)==1) $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1777
1778     // Select articles according to paging.
1779     $pagecount = ceil(count($keys)/$_SESSION['LINKS_PER_PAGE']);
1780     $pagecount = ($pagecount==0 ? 1 : $pagecount);
1781     $page=( empty($_GET['page']) ? 1 : intval($_GET['page']));
1782     $page = ( $page<1 ? 1 : $page );
1783     $page = ( $page>$pagecount ? $pagecount : $page );
1784     $i = ($page-1)*$_SESSION['LINKS_PER_PAGE']; // Start index.
1785     $end = $i+$_SESSION['LINKS_PER_PAGE'];
1786     $linkDisp=array(); // Links to display
1787     while ($i<$end && $i<count($keys))
1788     {
1789         $link = $linksToDisplay[$keys[$i]];
1790         $link['description']=nl2br(keepMultipleSpaces(text2clickable($link['description'])));
1791         $title=$link['title'];
1792         $classLi =  $i%2!=0 ? '' : 'publicLinkHightLight';
1793         $link['class'] = ($link['private']==0 ? $classLi : 'private');
1794         $link['timestamp']=linkdate2timestamp($link['linkdate']);
1795         $taglist = explode(' ',$link['tags']);
1796         uasort($taglist, 'strcasecmp');
1797         $link['taglist']=$taglist;
1798
1799         if ($link["url"][0] === '?' && // Check for both signs of a note: starting with ? and 7 chars long. I doubt that you'll post any links that look like this.
1800             strlen($link["url"]) === 7) {
1801             $link["url"] = indexUrl() . $link["url"];
1802         }
1803
1804         $linkDisp[$keys[$i]] = $link;
1805         $i++;
1806     }
1807
1808     // Compute paging navigation
1809     $searchterm= ( empty($_GET['searchterm']) ? '' : '&searchterm='.$_GET['searchterm'] );
1810     $searchtags= ( empty($_GET['searchtags']) ? '' : '&searchtags='.$_GET['searchtags'] );
1811     $paging='';
1812     $previous_page_url=''; if ($i!=count($keys)) $previous_page_url='?page='.($page+1).$searchterm.$searchtags;
1813     $next_page_url='';if ($page>1) $next_page_url='?page='.($page-1).$searchterm.$searchtags;
1814
1815     $token = ''; if (isLoggedIn()) $token=getToken();
1816
1817     // Fill all template fields.
1818     $PAGE->assign('linkcount',count($LINKSDB));
1819     $PAGE->assign('previous_page_url',$previous_page_url);
1820     $PAGE->assign('next_page_url',$next_page_url);
1821     $PAGE->assign('page_current',$page);
1822     $PAGE->assign('page_max',$pagecount);
1823     $PAGE->assign('result_count',count($linksToDisplay));
1824     $PAGE->assign('search_type',$search_type);
1825     $PAGE->assign('search_crits',$search_crits);
1826     $PAGE->assign('redirector',empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector']); // Optional redirector URL.
1827     $PAGE->assign('token',$token);
1828     $PAGE->assign('links',$linkDisp);
1829     $PAGE->assign('tags', $LINKSDB->allTags());
1830     return;
1831 }
1832
1833 // Compute the thumbnail for a link.
1834 //
1835 // With a link to the original URL.
1836 // Understands various services (youtube.com...)
1837 // Input: $url = URL for which the thumbnail must be found.
1838 //        $href = if provided, this URL will be followed instead of $url
1839 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1840 // Some of them may be missing.
1841 // Return an empty array if no thumbnail available.
1842 function computeThumbnail($url,$href=false)
1843 {
1844     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
1845     if ($href==false) $href=$url;
1846
1847     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1848     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1849     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1850     $domain = parse_url($url,PHP_URL_HOST);
1851     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1852     {
1853         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1854         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1855                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1856     }
1857     if ($domain=='youtu.be') // Youtube short links
1858     {
1859         $path = parse_url($url,PHP_URL_PATH);
1860         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1861                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1862     }
1863     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1864     {
1865         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1866         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1867                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1868     }
1869
1870     if ($domain=='imgur.com')
1871     {
1872         $path = parse_url($url,PHP_URL_PATH);
1873         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1874         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1875                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1876         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1877                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1878
1879         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1880                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1881     }
1882     if ($domain=='i.imgur.com')
1883     {
1884         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1885         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1886                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1887     }
1888     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1889     {
1890         if (strpos($url,'dailymotion.com/video/')!==false)
1891         {
1892             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1893             return array('src'=>$thumburl,
1894                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1895         }
1896     }
1897     if (endsWith($domain,'.imageshack.us'))
1898     {
1899         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1900         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1901         {
1902             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1903             return array('src'=>$thumburl,
1904                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1905         }
1906     }
1907
1908     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1909     // So we deport the thumbnail generation in order not to slow down page generation
1910     // (and we also cache the thumbnail)
1911
1912     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1913
1914     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1915         || $domain=='vimeo.com'
1916         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1917         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1918     )
1919     {
1920         if ($domain=='vimeo.com')
1921         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1922             $path = parse_url($url,PHP_URL_PATH);
1923             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1924         }
1925         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
1926         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
1927             $path = parse_url($url,PHP_URL_PATH);
1928             if (!preg_match('!/\d+.+?!',$path)) return array();
1929         }
1930         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
1931         {   // Make sure this TED URL points to a video (/talks/...)
1932             $path = parse_url($url,PHP_URL_PATH);
1933             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
1934         }
1935         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1936         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1937                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1938     }
1939
1940     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1941     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1942     // But using the extension will do.
1943     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1944     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1945     {
1946         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1947         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1948                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1949     }
1950     return array(); // No thumbnail.
1951
1952 }
1953
1954
1955 // Returns the HTML code to display a thumbnail for a link
1956 // with a link to the original URL.
1957 // Understands various services (youtube.com...)
1958 // Input: $url = URL for which the thumbnail must be found.
1959 //        $href = if provided, this URL will be followed instead of $url
1960 // Returns '' if no thumbnail available.
1961 function thumbnail($url,$href=false)
1962 {
1963     $t = computeThumbnail($url,$href);
1964     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1965
1966     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
1967     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1968     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1969     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1970     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1971     $html.='></a>';
1972     return $html;
1973 }
1974
1975 // Returns the HTML code to display a thumbnail for a link
1976 // for the picture wall (using lazy image loading)
1977 // Understands various services (youtube.com...)
1978 // Input: $url = URL for which the thumbnail must be found.
1979 //        $href = if provided, this URL will be followed instead of $url
1980 // Returns '' if no thumbnail available.
1981 function lazyThumbnail($url,$href=false)
1982 {
1983     $t = computeThumbnail($url,$href);
1984     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1985
1986     $html='<a href="'.escape($t['href']).'">';
1987
1988     // Lazy image
1989     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
1990
1991     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1992     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1993     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1994     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1995     $html.='>';
1996
1997     // No-JavaScript fallback.
1998     $html.='<noscript><img src="'.escape($t['src']).'"';
1999     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2000     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2001     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2002     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2003     $html.='></noscript></a>';
2004
2005     return $html;
2006 }
2007
2008
2009 // -----------------------------------------------------------------------------------------------
2010 // Installation
2011 // This function should NEVER be called if the file data/config.php exists.
2012 function install()
2013 {
2014     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2015     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2016
2017
2018     // This part makes sure sessions works correctly.
2019     // (Because on some hosts, session.save_path may not be set correctly,
2020     // or we may not have write access to it.)
2021     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2022     {   // Step 2: Check if data in session is correct.
2023         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2024         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2025         echo 'It currently points to '.session_save_path().'<br>';
2026         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2027         echo '<br><a href="?">Click to try again.</a></pre>';
2028         die;
2029     }
2030     if (!isset($_SESSION['session_tested']))
2031     {   // Step 1 : Try to store data in session and reload page.
2032         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2033         header('Location: '.indexUrl().'?test_session');  // Redirect to check stored data.
2034     }
2035     if (isset($_GET['test_session']))
2036     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2037         header('Location: '.indexUrl());
2038     }
2039
2040
2041     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2042     {
2043         $tz = 'UTC';
2044         if (!empty($_POST['continent']) && !empty($_POST['city']))
2045             if (isTZvalid($_POST['continent'],$_POST['city']))
2046                 $tz = $_POST['continent'].'/'.$_POST['city'];
2047         $GLOBALS['timezone'] = $tz;
2048         // Everything is ok, let's create config file.
2049         $GLOBALS['login'] = $_POST['setlogin'];
2050         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2051         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2052         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(indexUrl()) : $_POST['title'] );
2053         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2054         try {
2055             writeConfig($GLOBALS, isLoggedIn());
2056         }
2057         catch(Exception $e) {
2058             error_log(
2059                     'ERROR while writing config file after installation.' . PHP_EOL .
2060                     $e->getMessage()
2061                 );
2062
2063             // TODO: do not handle exceptions/errors in JS.
2064             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2065             exit;
2066         }
2067         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2068         exit;
2069     }
2070
2071     // Display config form:
2072     list($timezone_form,$timezone_js) = templateTZform();
2073     $timezone_html=''; if ($timezone_form!='') $timezone_html='<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2074
2075     $PAGE = new pageBuilder;
2076     $PAGE->assign('timezone_html',$timezone_html);
2077     $PAGE->assign('timezone_js',$timezone_js);
2078     $PAGE->renderPage('install');
2079     exit;
2080 }
2081
2082 // Generates the timezone selection form and JavaScript.
2083 // Input: (optional) current timezone (can be 'UTC/UTC'). It will be pre-selected.
2084 // Output: array(html,js)
2085 // Example: list($htmlform,$js) = templateTZform('Europe/Paris');  // Europe/Paris pre-selected.
2086 // Returns array('','') if server does not support timezones list. (e.g. PHP 5.1 on free.fr)
2087 function templateTZform($ptz=false)
2088 {
2089     if (function_exists('timezone_identifiers_list')) // because of old PHP version (5.1) which can be found on free.fr
2090     {
2091         // Try to split the provided timezone.
2092         if ($ptz==false) { $l=timezone_identifiers_list(); $ptz=$l[0]; }
2093         $spos=strpos($ptz,'/'); $pcontinent=substr($ptz,0,$spos); $pcity=substr($ptz,$spos+1);
2094
2095         // Display config form:
2096         $timezone_form = '';
2097         $timezone_js = '';
2098         // The list is in the form "Europe/Paris", "America/Argentina/Buenos_Aires"...
2099         // We split the list in continents/cities.
2100         $continents = array();
2101         $cities = array();
2102         foreach(timezone_identifiers_list() as $tz)
2103         {
2104             if ($tz=='UTC') $tz='UTC/UTC';
2105             $spos = strpos($tz,'/');
2106             if ($spos!==false)
2107             {
2108                 $continent=substr($tz,0,$spos); $city=substr($tz,$spos+1);
2109                 $continents[$continent]=1;
2110                 if (!isset($cities[$continent])) $cities[$continent]='';
2111                 $cities[$continent].='<option value="'.$city.'"'.($pcity==$city?' selected':'').'>'.$city.'</option>';
2112             }
2113         }
2114         $continents_html = '';
2115         $continents = array_keys($continents);
2116         foreach($continents as $continent)
2117             $continents_html.='<option  value="'.$continent.'"'.($pcontinent==$continent?' selected':'').'>'.$continent.'</option>';
2118         $cities_html = $cities[$pcontinent];
2119         $timezone_form = "Continent: <select name=\"continent\" id=\"continent\" onChange=\"onChangecontinent();\">${continents_html}</select>";
2120         $timezone_form .= "&nbsp;&nbsp;&nbsp;&nbsp;City: <select name=\"city\" id=\"city\">${cities[$pcontinent]}</select><br />";
2121         $timezone_js = "<script>";
2122         $timezone_js .= "function onChangecontinent(){document.getElementById(\"city\").innerHTML = citiescontinent[document.getElementById(\"continent\").value];}";
2123         $timezone_js .= "var citiescontinent = ".json_encode($cities).";" ;
2124         $timezone_js .= "</script>" ;
2125         return array($timezone_form,$timezone_js);
2126     }
2127     return array('','');
2128 }
2129
2130 // Tells if a timezone is valid or not.
2131 // If not valid, returns false.
2132 // If system does not support timezone list, returns false.
2133 function isTZvalid($continent,$city)
2134 {
2135     $tz = $continent.'/'.$city;
2136     if (function_exists('timezone_identifiers_list')) // because of old PHP version (5.1) which can be found on free.fr
2137     {
2138         if (in_array($tz, timezone_identifiers_list())) // it's a valid timezone?
2139                     return true;
2140     }
2141     return false;
2142 }
2143 if (!function_exists('json_encode')) {
2144     function json_encode($data) {
2145         switch ($type = gettype($data)) {
2146             case 'NULL':
2147                 return 'null';
2148             case 'boolean':
2149                 return ($data ? 'true' : 'false');
2150             case 'integer':
2151             case 'double':
2152             case 'float':
2153                 return $data;
2154             case 'string':
2155                 return '"' . addslashes($data) . '"';
2156             case 'object':
2157                 $data = get_object_vars($data);
2158             case 'array':
2159                 $output_index_count = 0;
2160                 $output_indexed = array();
2161                 $output_associative = array();
2162                 foreach ($data as $key => $value) {
2163                     $output_indexed[] = json_encode($value);
2164                     $output_associative[] = json_encode($key) . ':' . json_encode($value);
2165                     if ($output_index_count !== NULL && $output_index_count++ !== $key) {
2166                         $output_index_count = NULL;
2167                     }
2168                 }
2169                 if ($output_index_count !== NULL) {
2170                     return '[' . implode(',', $output_indexed) . ']';
2171                 } else {
2172                     return '{' . implode(',', $output_associative) . '}';
2173                 }
2174             default:
2175                 return ''; // Not supported
2176         }
2177     }
2178 }
2179
2180
2181
2182 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2183    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2184    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2185    This function is called by passing the URL:
2186    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2187    [URL] is the URL of the link (e.g. a flickr page)
2188    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2189    The function below will fetch the image from the webservice and store it in the cache.
2190 */
2191 function genThumbnail()
2192 {
2193     // Make sure the parameters in the URL were generated by us.
2194     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2195     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2196
2197     // Let's see if we don't already have the image for this URL in the cache.
2198     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2199     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2200     {   // We have the thumbnail, just serve it:
2201         header('Content-Type: image/jpeg');
2202         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2203         return;
2204     }
2205     // We may also serve a blank image (if service did not respond)
2206     $blankname=hash('sha1',$_GET['url']).'.gif';
2207     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2208     {
2209         header('Content-Type: image/gif');
2210         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2211         return;
2212     }
2213
2214     // Otherwise, generate the thumbnail.
2215     $url = $_GET['url'];
2216     $domain = parse_url($url,PHP_URL_HOST);
2217
2218     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2219     {
2220         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2221         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2222
2223         // Is this a link to an image, or to a flickr page ?
2224         $imageurl='';
2225         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2226         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2227             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2228             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2229         }
2230         else // This is a flickr page (html)
2231         {
2232             list($httpstatus,$headers,$data) = getHTTP($url,20); // Get the flickr html page.
2233             if (strpos($httpstatus,'200 OK')!==false)
2234             {
2235                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2236                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!',$data,$matches);
2237                 if (!empty($matches[1])) $imageurl=$matches[1];
2238
2239                 // In albums (and some other pages), the link rel="image_src" is not provided,
2240                 // but flickr provides:
2241                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2242                 if ($imageurl=='')
2243                 {
2244                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!',$data,$matches);
2245                     if (!empty($matches[1])) $imageurl=$matches[1];
2246                 }
2247             }
2248         }
2249
2250         if ($imageurl!='')
2251         {   // Let's download the image.
2252             list($httpstatus,$headers,$data) = getHTTP($imageurl,10); // Image is 240x120, so 10 seconds to download should be enough.
2253             if (strpos($httpstatus,'200 OK')!==false)
2254             {
2255                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2256                 header('Content-Type: image/jpeg');
2257                 echo $data;
2258                 return;
2259             }
2260         }
2261     }
2262
2263     elseif ($domain=='vimeo.com' )
2264     {
2265         // This is more complex: we have to perform a HTTP request, then parse the result.
2266         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2267         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2268         list($httpstatus,$headers,$data) = getHTTP('https://vimeo.com/api/v2/video/'.escape($vid).'.php',5);
2269         if (strpos($httpstatus,'200 OK')!==false)
2270         {
2271             $t = unserialize($data);
2272             $imageurl = $t[0]['thumbnail_medium'];
2273             // Then we download the image and serve it to our client.
2274             list($httpstatus,$headers,$data) = getHTTP($imageurl,10);
2275             if (strpos($httpstatus,'200 OK')!==false)
2276             {
2277                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2278                 header('Content-Type: image/jpeg');
2279                 echo $data;
2280                 return;
2281             }
2282         }
2283     }
2284
2285     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2286     {
2287         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2288         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2289         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2290         list($httpstatus,$headers,$data) = getHTTP($url,5);
2291         if (strpos($httpstatus,'200 OK')!==false)
2292         {
2293             // Extract the link to the thumbnail
2294             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!',$data,$matches);
2295             if (!empty($matches[1]))
2296             {   // Let's download the image.
2297                 $imageurl=$matches[1];
2298                 list($httpstatus,$headers,$data) = getHTTP($imageurl,20); // No control on image size, so wait long enough.
2299                 if (strpos($httpstatus,'200 OK')!==false)
2300                 {
2301                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2302                     file_put_contents($filepath,$data); // Save image to cache.
2303                     if (resizeImage($filepath))
2304                     {
2305                         header('Content-Type: image/jpeg');
2306                         echo file_get_contents($filepath);
2307                         return;
2308                     }
2309                 }
2310             }
2311         }
2312     }
2313
2314     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2315     {
2316         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2317         // http://xkcd.com/327/
2318         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2319         list($httpstatus,$headers,$data) = getHTTP($url,5);
2320         if (strpos($httpstatus,'200 OK')!==false)
2321         {
2322             // Extract the link to the thumbnail
2323             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!',$data,$matches);
2324             if (!empty($matches[1]))
2325             {   // Let's download the image.
2326                 $imageurl=$matches[1];
2327                 list($httpstatus,$headers,$data) = getHTTP($imageurl,20); // No control on image size, so wait long enough.
2328                 if (strpos($httpstatus,'200 OK')!==false)
2329                 {
2330                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2331                     file_put_contents($filepath,$data); // Save image to cache.
2332                     if (resizeImage($filepath))
2333                     {
2334                         header('Content-Type: image/jpeg');
2335                         echo file_get_contents($filepath);
2336                         return;
2337                     }
2338                 }
2339             }
2340         }
2341     }
2342
2343     else
2344     {
2345         // For all other domains, we try to download the image and make a thumbnail.
2346         list($httpstatus,$headers,$data) = getHTTP($url,30);  // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2347         if (strpos($httpstatus,'200 OK')!==false)
2348         {
2349             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2350             file_put_contents($filepath,$data); // Save image to cache.
2351             if (resizeImage($filepath))
2352             {
2353                 header('Content-Type: image/jpeg');
2354                 echo file_get_contents($filepath);
2355                 return;
2356             }
2357         }
2358     }
2359
2360
2361     // Otherwise, return an empty image (8x8 transparent gif)
2362     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2363     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2364     header('Content-Type: image/gif');
2365     echo $blankgif;
2366 }
2367
2368 // Make a thumbnail of the image (to width: 120 pixels)
2369 // Returns true if success, false otherwise.
2370 function resizeImage($filepath)
2371 {
2372     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2373
2374     // Trick: some stupid people rename GIF as JPEG... or else.
2375     // So we really try to open each image type whatever the extension is.
2376     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2377     $im=false;
2378     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2379     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2380     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2381     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2382     $w = imagesx($im);
2383     $h = imagesy($im);
2384     $ystart = 0; $yheight=$h;
2385     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2386     $nw = 120;   // Desired width
2387     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2388     // Resize image:
2389     $im2 = imagecreatetruecolor($nw,$nh);
2390     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2391     imageinterlace($im2,true); // For progressive JPEG.
2392     $tempname=$filepath.'_TEMP.jpg';
2393     imagejpeg($im2, $tempname, 90);
2394     imagedestroy($im);
2395     imagedestroy($im2);
2396     unlink($filepath);
2397     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2398     return true;
2399 }
2400
2401 // Invalidate caches when the database is changed or the user logs out.
2402 // (e.g. tags cache).
2403 function invalidateCaches()
2404 {
2405     unset($_SESSION['tags']);  // Purge cache attached to session.
2406     pageCache::purgeCache();   // Purge page cache shared by sessions.
2407 }
2408
2409 try {
2410     mergeDeprecatedConfig($GLOBALS, isLoggedIn());
2411 } catch(Exception $e) {
2412     error_log(
2413         'ERROR while merging deprecated options.php file.' . PHP_EOL .
2414         $e->getMessage()
2415     );
2416 }
2417
2418 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2419 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2420 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2421 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2422 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=daily')) { showDaily(); exit; }
2423 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2424 renderPage();
2425 ?>