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 {
 858     // Cache system
 859     $query = $_SERVER["QUERY_STRING"];
 860     $cache = new pageCache(pageUrl(),startsWith($query,'do=dailyrss') && !isLoggedIn());
 861     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
 862     // If cached was not found (or not usable), then read the database and build the response:
 863
 864 // Read links from database (and filter private links if used it not logged in).
 865     $LINKSDB = new LinkDB(
 866         $GLOBALS['config']['DATASTORE'],
 867         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 868         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 869     );
 870
 871     /* Some Shaarlies may have very few links, so we need to look
 872        back in time (rsort()) until we have enough days ($nb_of_days).
 873     */
 874     $linkdates=array(); foreach($LINKSDB as $linkdate=>$value) { $linkdates[]=$linkdate; }
 875     rsort($linkdates);
 876     $nb_of_days=7; // We take 7 days.
 877     $today=Date('Ymd');
 878     $days=array();
 879     foreach($linkdates as $linkdate)
 880     {
 881         $day=substr($linkdate,0,8); // Extract day (without time)
 882         if (strcmp($day,$today)<0)
 883         {
 884             if (empty($days[$day])) $days[$day]=array();
 885             $days[$day][]=$linkdate;
 886         }
 887         if (count($days)>$nb_of_days) break; // Have we collected enough days?
 888     }
 889
 890     // Build the RSS feed.
 891     header('Content-Type: application/rss+xml; charset=utf-8');
 892     $pageaddr=escape(indexUrl());
 893     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 894     echo '<channel><title>Daily - '.$GLOBALS['title'].'</title><link>'.$pageaddr.'</link>';
 895     echo '<description>Daily shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n";
 896
 897     foreach($days as $day=>$linkdates) // For each day.
 898     {
 899         $daydate = utf8_encode(strftime('%A %d, %B %Y',linkdate2timestamp($day.'_000000'))); // Full text date
 900         $rfc822date = linkdate2rfc822($day.'_000000');
 901         $absurl=escape(indexUrl().'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 902         echo '<item><title>'.$GLOBALS['title'].' - '.$daydate.'</title><guid>'.$absurl.'</guid><link>'.$absurl.'</link>';
 903         echo '<pubDate>'.escape($rfc822date)."</pubDate>";
 904
 905         // Build the HTML body of this RSS entry.
 906         $html='';
 907         $href='';
 908         $links=array();
 909         // We pre-format some fields for proper output.
 910         foreach($linkdates as $linkdate)
 911         {
 912             $l = $LINKSDB[$linkdate];
 913             $l['formatedDescription']=nl2br(keepMultipleSpaces(text2clickable($l['description'])));
 914             $l['thumbnail'] = thumbnail($l['url']);
 915             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
 916             if (startsWith($l['url'],'?')) $l['url']=indexUrl().$l['url'];  // make permalink URL absolute
 917             $links[$linkdate]=$l;
 918         }
 919         // Then build the HTML for this day:
 920         $tpl = new RainTPL;
 921         $tpl->assign('links',$links);
 922         $html = $tpl->draw('dailyrss',$return_string=true);
 923         echo "\n";
 924         echo '<description><![CDATA['.$html.']]></description>'."\n</item>\n\n";
 925
 926     }
 927     echo '</channel></rss><!-- Cached version of '.escape(pageUrl()).' -->';
 928
 929     $cache->cache(ob_get_contents());
 930     ob_end_flush();
 931     exit;
 932 }
 933
 934 // "Daily" page.
 935 function showDaily()
 936 {
 937     $LINKSDB = new LinkDB(
 938         $GLOBALS['config']['DATASTORE'],
 939         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 940         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 941     );
 942
 943     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 944     if (isset($_GET['day'])) $day=$_GET['day'];
 945
 946     $days = $LINKSDB->days();
 947     $i = array_search($day,$days);
 948     if ($i==false) { $i=count($days)-1; $day=$days[$i]; }
 949     $previousday='';
 950     $nextday='';
 951     if ($i!==false)
 952     {
 953         if ($i>1) $previousday=$days[$i-1];
 954         if ($i<count($days)-1) $nextday=$days[$i+1];
 955     }
 956
 957     $linksToDisplay=$LINKSDB->filterDay($day);
 958     // We pre-format some fields for proper output.
 959     foreach($linksToDisplay as $key=>$link)
 960     {
 961
 962         $taglist = explode(' ',$link['tags']);
 963         uasort($taglist, 'strcasecmp');
 964         $linksToDisplay[$key]['taglist']=$taglist;
 965         $linksToDisplay[$key]['formatedDescription']=nl2br(keepMultipleSpaces(text2clickable($link['description'])));
 966         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
 967         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
 968     }
 969
 970     /* We need to spread the articles on 3 columns.
 971        I did not want to use a JavaScript lib like http://masonry.desandro.com/
 972        so I manually spread entries with a simple method: I roughly evaluate the
 973        height of a div according to title and description length.
 974     */
 975     $columns=array(array(),array(),array()); // Entries to display, for each column.
 976     $fill=array(0,0,0);  // Rough estimate of columns fill.
 977     foreach($linksToDisplay as $key=>$link)
 978     {
 979         // Roughly estimate length of entry (by counting characters)
 980         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
 981         // Description: 836 characters gives roughly 342 pixel height.
 982         // This is not perfect, but it's usually OK.
 983         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
 984         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
 985         // Then put in column which is the less filled:
 986         $smallest=min($fill); // find smallest value in array.
 987         $index=array_search($smallest,$fill); // find index of this smallest value.
 988         array_push($columns[$index],$link); // Put entry in this column.
 989         $fill[$index]+=$length;
 990     }
 991     $PAGE = new pageBuilder;
 992     $PAGE->assign('linksToDisplay',$linksToDisplay);
 993     $PAGE->assign('linkcount',count($LINKSDB));
 994     $PAGE->assign('cols', $columns);
 995     $PAGE->assign('day',linkdate2timestamp($day.'_000000'));
 996     $PAGE->assign('previousday',$previousday);
 997     $PAGE->assign('nextday',$nextday);
 998     $PAGE->renderPage('daily');
 999     exit;
1000 }
1001
1002
1003 // ------------------------------------------------------------------------------------------
1004 // Render HTML page (according to URL parameters and user rights)
1005 function renderPage()
1006 {
1007     $LINKSDB = new LinkDB(
1008         $GLOBALS['config']['DATASTORE'],
1009         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
1010         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
1011     );
1012
1013     // -------- Display login form.
1014     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=login'))
1015     {
1016         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1017         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1018         $PAGE = new pageBuilder;
1019         $PAGE->assign('token',$token);
1020         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
1021         $PAGE->renderPage('loginform');
1022         exit;
1023     }
1024     // -------- User wants to logout.
1025     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1026     {
1027         invalidateCaches();
1028         logout();
1029         header('Location: ?');
1030         exit;
1031     }
1032
1033     // -------- Picture wall
1034     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=picwall'))
1035     {
1036         // Optionally filter the results:
1037         $links=array();
1038         if (!empty($_GET['searchterm'])) $links = $LINKSDB->filterFulltext($_GET['searchterm']);
1039         elseif (!empty($_GET['searchtags']))   $links = $LINKSDB->filterTags(trim($_GET['searchtags']));
1040         else $links = $LINKSDB;
1041
1042         $body='';
1043         $linksToDisplay=array();
1044
1045         // Get only links which have a thumbnail.
1046         foreach($links as $link)
1047         {
1048             $permalink='?'.escape(smallhash($link['linkdate']));
1049             $thumb=lazyThumbnail($link['url'],$permalink);
1050             if ($thumb!='') // Only output links which have a thumbnail.
1051             {
1052                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1053                 $linksToDisplay[]=$link; // Add to array.
1054             }
1055         }
1056
1057         $PAGE = new pageBuilder;
1058         $PAGE->assign('linkcount',count($LINKSDB));
1059         $PAGE->assign('linksToDisplay',$linksToDisplay);
1060         $PAGE->renderPage('picwall');
1061         exit;
1062     }
1063
1064     // -------- Tag cloud
1065     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tagcloud'))
1066     {
1067         $tags= $LINKSDB->allTags();
1068
1069         // We sort tags alphabetically, then choose a font size according to count.
1070         // First, find max value.
1071         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1072         ksort($tags);
1073         $tagList=array();
1074         foreach($tags as $key=>$value)
1075         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1076         {
1077             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1078         }
1079         $PAGE = new pageBuilder;
1080         $PAGE->assign('linkcount',count($LINKSDB));
1081         $PAGE->assign('tags',$tagList);
1082         $PAGE->renderPage('tagcloud');
1083         exit;
1084     }
1085
1086     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1087     if (isset($_GET['addtag']))
1088     {
1089         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1090         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1091         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1092
1093         // Check if this tag is already in the search query and ignore it if it is.
1094         // Each tag is always separated by a space
1095         $current_tags = explode(' ', $params['searchtags']);
1096         $addtag = true;
1097         foreach ($current_tags as $value) {
1098             if ($value === $_GET['addtag']) {
1099                 $addtag = false;
1100                 break;
1101             }
1102         }
1103         // Append the tag if necessary
1104         if (empty($params['searchtags'])) {
1105             $params['searchtags'] = trim($_GET['addtag']);
1106         }
1107         else if ($addtag) {
1108             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1109         }
1110
1111         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1112         header('Location: ?'.http_build_query($params));
1113         exit;
1114     }
1115
1116     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1117     if (isset($_GET['removetag']))
1118     {
1119         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1120         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?'); exit; } // In case browser does not send HTTP_REFERER
1121         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1122         if (isset($params['searchtags']))
1123         {
1124             $tags = explode(' ',$params['searchtags']);
1125             $tags=array_diff($tags, array($_GET['removetag'])); // Remove value from array $tags.
1126             if (count($tags)==0) unset($params['searchtags']); else $params['searchtags'] = implode(' ',$tags);
1127             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1128         }
1129         header('Location: ?'.http_build_query($params));
1130         exit;
1131     }
1132
1133     // -------- User wants to change the number of links per page (linksperpage=...)
1134     if (isset($_GET['linksperpage']))
1135     {
1136         if (is_numeric($_GET['linksperpage'])) { $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage'])); }
1137         // Make sure the referrer is Shaarli itself.
1138         $referer = '?';
1139         if (!empty($_SERVER['HTTP_REFERER']) && strcmp(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST),$_SERVER['HTTP_HOST'])==0)
1140             $referer = $_SERVER['HTTP_REFERER'];
1141         header('Location: '.$referer);
1142         exit;
1143     }
1144
1145     // -------- User wants to see only private links (toggle)
1146     if (isset($_GET['privateonly']))
1147     {
1148         if (empty($_SESSION['privateonly']))
1149         {
1150             $_SESSION['privateonly']=1; // See only private links
1151         }
1152         else
1153         {
1154             unset($_SESSION['privateonly']); // See all links
1155         }
1156         // Make sure the referrer is Shaarli itself.
1157         $referer = '?';
1158         if (!empty($_SERVER['HTTP_REFERER']) && strcmp(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST),$_SERVER['HTTP_HOST'])==0)
1159             $referer = $_SERVER['HTTP_REFERER'];
1160         header('Location: '.$referer);
1161         exit;
1162     }
1163
1164     // -------- Handle other actions allowed for non-logged in users:
1165     if (!isLoggedIn())
1166     {
1167         // User tries to post new link but is not logged in:
1168         // Show login screen, then redirect to ?post=...
1169         if (isset($_GET['post']))
1170         {
1171             header('Location: ?do=login&post='.urlencode($_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.
1172             exit;
1173         }
1174
1175                 // Same case as above except that user tried to access ?do=addlink without being logged in
1176                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1177                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1178                         header('Location: ?do=login&post=');
1179                         exit;
1180                 }
1181
1182         $PAGE = new pageBuilder;
1183         buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1184         $PAGE->renderPage('linklist');
1185         exit; // Never remove this one! All operations below are reserved for logged in user.
1186     }
1187
1188     // -------- All other functions are reserved for the registered user:
1189
1190     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1191     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tools'))
1192     {
1193         $PAGE = new pageBuilder;
1194         $PAGE->assign('linkcount',count($LINKSDB));
1195         $PAGE->assign('pageabsaddr',indexUrl());
1196         $PAGE->renderPage('tools');
1197         exit;
1198     }
1199
1200     // -------- User wants to change his/her password.
1201     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changepasswd'))
1202     {
1203         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1204         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1205         {
1206             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1207
1208             // Make sure old password is correct.
1209             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1210             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1211             // Save new password
1212             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1213             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1214             try {
1215                 writeConfig($GLOBALS, isLoggedIn());
1216             }
1217             catch(Exception $e) {
1218                 error_log(
1219                     'ERROR while writing config file after changing password.' . PHP_EOL .
1220                     $e->getMessage()
1221                 );
1222
1223                 // TODO: do not handle exceptions/errors in JS.
1224                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1225                 exit;
1226             }
1227             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1228             exit;
1229         }
1230         else // show the change password form.
1231         {
1232             $PAGE = new pageBuilder;
1233             $PAGE->assign('linkcount',count($LINKSDB));
1234             $PAGE->assign('token',getToken());
1235             $PAGE->renderPage('changepassword');
1236             exit;
1237         }
1238     }
1239
1240     // -------- User wants to change configuration
1241     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=configure'))
1242     {
1243         if (!empty($_POST['title']) )
1244         {
1245             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1246             $tz = 'UTC';
1247             if (!empty($_POST['continent']) && !empty($_POST['city']))
1248                 if (isTZvalid($_POST['continent'],$_POST['city']))
1249                     $tz = $_POST['continent'].'/'.$_POST['city'];
1250             $GLOBALS['timezone'] = $tz;
1251             $GLOBALS['title']=$_POST['title'];
1252             $GLOBALS['titleLink']=$_POST['titleLink'];
1253             $GLOBALS['redirector']=$_POST['redirector'];
1254             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1255             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1256             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1257             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1258             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1259             try {
1260                 writeConfig($GLOBALS, isLoggedIn());
1261             }
1262             catch(Exception $e) {
1263                 error_log(
1264                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1265                     $e->getMessage()
1266                 );
1267
1268                 // TODO: do not handle exceptions/errors in JS.
1269                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1270                 exit;
1271             }
1272             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1273             exit;
1274         }
1275         else // Show the configuration form.
1276         {
1277             $PAGE = new pageBuilder;
1278             $PAGE->assign('linkcount',count($LINKSDB));
1279             $PAGE->assign('token',getToken());
1280             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1281             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1282             list($timezone_form,$timezone_js) = templateTZform($GLOBALS['timezone']);
1283             $PAGE->assign('timezone_form',$timezone_form); // FIXME: Put entire tz form generation in template?
1284             $PAGE->assign('timezone_js',$timezone_js);
1285             $PAGE->renderPage('configure');
1286             exit;
1287         }
1288     }
1289
1290     // -------- User wants to rename a tag or delete it
1291     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changetag'))
1292     {
1293         if (empty($_POST['fromtag']))
1294         {
1295             $PAGE = new pageBuilder;
1296             $PAGE->assign('linkcount',count($LINKSDB));
1297             $PAGE->assign('token',getToken());
1298             $PAGE->assign('tags', $LINKSDB->allTags());
1299             $PAGE->renderPage('changetag');
1300             exit;
1301         }
1302         if (!tokenOk($_POST['token'])) die('Wrong token.');
1303
1304         // Delete a tag:
1305         if (!empty($_POST['deletetag']) && !empty($_POST['fromtag']))
1306         {
1307             $needle=trim($_POST['fromtag']);
1308             $linksToAlter = $LINKSDB->filterTags($needle,true); // True for case-sensitive tag search.
1309             foreach($linksToAlter as $key=>$value)
1310             {
1311                 $tags = explode(' ',trim($value['tags']));
1312                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1313                 $value['tags']=trim(implode(' ',$tags));
1314                 $LINKSDB[$key]=$value;
1315             }
1316             $LINKSDB->savedb(); // Save to disk.
1317             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1318             exit;
1319         }
1320
1321         // Rename a tag:
1322         if (!empty($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag']))
1323         {
1324             $needle=trim($_POST['fromtag']);
1325             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
1326             foreach($linksToAlter as $key=>$value)
1327             {
1328                 $tags = explode(' ',trim($value['tags']));
1329                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1330                 $value['tags']=trim(implode(' ',$tags));
1331                 $LINKSDB[$key]=$value;
1332             }
1333             $LINKSDB->savedb(); // Save to disk.
1334             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1335             exit;
1336         }
1337     }
1338
1339     // -------- User wants to add a link without using the bookmarklet: Show form.
1340     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=addlink'))
1341     {
1342         $PAGE = new pageBuilder;
1343         $PAGE->assign('linkcount',count($LINKSDB));
1344         $PAGE->renderPage('addlink');
1345         exit;
1346     }
1347
1348     // -------- User clicked the "Save" button when editing a link: Save link to database.
1349     if (isset($_POST['save_edit']))
1350     {
1351         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1352         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1353         $linkdate=$_POST['lf_linkdate'];
1354         $url = trim($_POST['lf_url']);
1355         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?') && !startsWith($url,'javascript:'))
1356             $url = 'http://'.$url;
1357         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1358                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1359         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1360         $LINKSDB[$linkdate] = $link;
1361         $LINKSDB->savedb(); // Save to disk.
1362         pubsubhub();
1363
1364         // If we are called from the bookmarklet, we must close the popup:
1365         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1366         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1367         $returnurl .= '#'.smallHash($linkdate);  // Scroll to the link which has been edited.
1368         if (strstr($returnurl, "do=addlink")) { $returnurl = '?'; } //if we come from ?do=addlink, set returnurl to homepage instead
1369         header('Location: '.$returnurl); // After saving the link, redirect to the page the user was on.
1370         exit;
1371     }
1372
1373     // -------- User clicked the "Cancel" button when editing a link.
1374     if (isset($_POST['cancel_edit']))
1375     {
1376         // If we are called from the bookmarklet, we must close the popup:
1377         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1378         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1379         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1380         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1381         exit;
1382     }
1383
1384     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1385     if (isset($_POST['delete_link']))
1386     {
1387         if (!tokenOk($_POST['token'])) die('Wrong token.');
1388         // We do not need to ask for confirmation:
1389         // - confirmation is handled by JavaScript
1390         // - we are protected from XSRF by the token.
1391         $linkdate=$_POST['lf_linkdate'];
1392         unset($LINKSDB[$linkdate]);
1393         $LINKSDB->savedb(); // save to disk
1394
1395         // If we are called from the bookmarklet, we must close the popup:
1396         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1397         // Pick where we're going to redirect
1398         // =============================================================
1399         // Basically, we can't redirect to where we were previously if it was a permalink
1400         // or an edit_link, because it would 404.
1401         // Cases:
1402         //    - /             : nothing in $_GET, redirect to self
1403         //    - /?page        : redirect to self
1404         //    - /?searchterm  : redirect to self (there might be other links)
1405         //    - /?searchtags  : redirect to self
1406         //    - /permalink    : redirect to / (the link does not exist anymore)
1407         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1408         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1409         // redirect is not satisfied, and only then redirect to /
1410         $location = "?";
1411         // Self redirection
1412         if (count($_GET) == 0    ||
1413             isset($_GET['page']) ||
1414             isset($_GET['searchterm']) ||
1415             isset($_GET['searchtags'])) {
1416
1417             if (isset($_POST['returnurl'])) {
1418                 $location = $_POST['returnurl']; // Handle redirects given by the form
1419             }
1420
1421             if ($location === "?" &&
1422                 isset($_SERVER['HTTP_REFERER'])) { // Handle HTTP_REFERER in case we're not coming from the same place.
1423                 $location = $_SERVER['HTTP_REFERER'];
1424             }
1425         }
1426
1427         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1428         exit;
1429     }
1430
1431     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1432     if (isset($_GET['edit_link']))
1433     {
1434         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1435         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1436         $PAGE = new pageBuilder;
1437         $PAGE->assign('linkcount',count($LINKSDB));
1438         $PAGE->assign('link',$link);
1439         $PAGE->assign('link_is_new',false);
1440         $PAGE->assign('token',getToken()); // XSRF protection.
1441         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''));
1442         $PAGE->assign('tags', $LINKSDB->allTags());
1443         $PAGE->renderPage('editlink');
1444         exit;
1445     }
1446
1447     // -------- User want to post a new link: Display link edit form.
1448     if (isset($_GET['post']))
1449     {
1450         $url=$_GET['post'];
1451
1452
1453         // We remove the annoying parameters added by FeedBurner, GoogleFeedProxy, Facebook...
1454         $annoyingpatterns = array('/[\?&]utm_source=[^&]*/',
1455             '/[\?&]utm_campaign=[^&]*/',
1456             '/[\?&]utm_medium=[^&]*/',
1457             '/#xtor=RSS-[^&]*/',
1458             '/[\?&]fb_[^&]*/',
1459             '/[\?&]__scoop[^&]*/',
1460             '/#tk\.rss_all\?/',
1461             '/[\?&]action_ref_map=[^&]*/',
1462             '/[\?&]action_type_map=[^&]*/',
1463             '/[\?&]action_object_map=[^&]*/',
1464             '/[\?&]utm_content=[^&]*/',
1465             '/[\?&]fb=[^&]*/',
1466             '/[\?&]xtor=[^&]*/'
1467             );
1468         foreach($annoyingpatterns as $pattern)
1469         {
1470             $url = preg_replace($pattern, "", $url);
1471         }
1472
1473         $link_is_new = false;
1474         $link = $LINKSDB->getLinkFromUrl($url); // Check if URL is not already in database (in this case, we will edit the existing link)
1475         if (!$link)
1476         {
1477             $link_is_new = true;  // This is a new link
1478             $linkdate = strval(date('Ymd_His'));
1479             $title = (empty($_GET['title']) ? '' : $_GET['title'] ); // Get title if it was provided in URL (by the bookmarklet).
1480             $description = (empty($_GET['description']) ? '' : $_GET['description']); // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1481             $tags = (empty($_GET['tags']) ? '' : $_GET['tags'] ); // Get tags if it was provided in URL
1482             $private = (!empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0); // Get private if it was provided in URL
1483             if (($url!='') && parse_url($url,PHP_URL_SCHEME)=='') $url = 'http://'.$url;
1484             // 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.)
1485             if (empty($title) && parse_url($url,PHP_URL_SCHEME)=='http')
1486             {
1487                 list($status,$headers,$data) = getHTTP($url,4); // Short timeout to keep the application responsive.
1488                 // FIXME: Decode charset according to specified in either 1) HTTP response headers or 2) <head> in html
1489                 if (strpos($status,'200 OK')!==false)
1490                                          {
1491                         // Look for charset in html header.
1492                                                 preg_match('#<meta .*charset=.*>#Usi', $data, $meta);
1493
1494                                                 // If found, extract encoding.
1495                                                 if (!empty($meta[0]))
1496                                                 {
1497                                                         // Get encoding specified in header.
1498                                                         preg_match('#charset="?(.*)"#si', $meta[0], $enc);
1499                                                         // If charset not found, use utf-8.
1500                                                         $html_charset = (!empty($enc[1])) ? strtolower($enc[1]) : 'utf-8';
1501                                                 }
1502                                                 else { $html_charset = 'utf-8'; }
1503
1504                                                 // Extract title
1505                                                 $title = html_extract_title($data);
1506                                                 if (!empty($title))
1507                                                 {
1508                                                         // Re-encode title in utf-8 if necessary.
1509                                                         $title = ($html_charset == 'iso-8859-1') ? utf8_encode($title) : $title;
1510                                                 }
1511                                         }
1512             }
1513             if ($url=='') // In case of empty URL, this is just a text (with a link that points to itself)
1514             {
1515                 $url='?'.smallHash($linkdate);
1516                 $title='Note: ';
1517             }
1518             $link = array('linkdate'=>$linkdate,'title'=>$title,'url'=>$url,'description'=>$description,'tags'=>$tags,'private'=>$private);
1519         }
1520
1521         $PAGE = new pageBuilder;
1522         $PAGE->assign('linkcount',count($LINKSDB));
1523         $PAGE->assign('link',$link);
1524         $PAGE->assign('link_is_new',$link_is_new);
1525         $PAGE->assign('token',getToken()); // XSRF protection.
1526         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : ''));
1527         $PAGE->assign('source',(isset($_GET['source']) ? $_GET['source'] : ''));
1528         $PAGE->assign('tags', $LINKSDB->allTags());
1529         $PAGE->renderPage('editlink');
1530         exit;
1531     }
1532
1533     // -------- Export as Netscape Bookmarks HTML file.
1534     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=export'))
1535     {
1536         if (empty($_GET['what']))
1537         {
1538             $PAGE = new pageBuilder;
1539             $PAGE->assign('linkcount',count($LINKSDB));
1540             $PAGE->renderPage('export');
1541             exit;
1542         }
1543         $exportWhat=$_GET['what'];
1544         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1545
1546         header('Content-Type: text/html; charset=utf-8');
1547         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1548         $currentdate=date('Y/m/d H:i:s');
1549         echo <<<HTML
1550 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1551 <!-- This is an automatically generated file.
1552      It will be read and overwritten.
1553      DO NOT EDIT! -->
1554 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1555 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1556 <TITLE>Bookmarks</TITLE>
1557 <H1>Bookmarks</H1>
1558 HTML;
1559         foreach($LINKSDB as $link)
1560         {
1561             if ($exportWhat=='all' ||
1562                ($exportWhat=='private' && $link['private']!=0) ||
1563                ($exportWhat=='public' && $link['private']==0))
1564             {
1565                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1566                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1567                 echo '>'.$link['title']."</A>\n";
1568                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1569             }
1570         }
1571                 exit;
1572     }
1573
1574     // -------- User is uploading a file for import
1575     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1576     {
1577         // If file is too big, some form field may be missing.
1578         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1579         {
1580             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1581             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1582             exit;
1583         }
1584         if (!tokenOk($_POST['token'])) die('Wrong token.');
1585         importFile();
1586         exit;
1587     }
1588
1589     // -------- Show upload/import dialog:
1590     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=import'))
1591     {
1592         $PAGE = new pageBuilder;
1593         $PAGE->assign('linkcount',count($LINKSDB));
1594         $PAGE->assign('token',getToken());
1595         $PAGE->assign('maxfilesize',getMaxFileSize());
1596         $PAGE->renderPage('import');
1597         exit;
1598     }
1599
1600     // -------- Otherwise, simply display search form and links:
1601     $PAGE = new pageBuilder;
1602     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1603     $PAGE->renderPage('linklist');
1604     exit;
1605 }
1606
1607 // -----------------------------------------------------------------------------------------------
1608 // Process the import file form.
1609 function importFile()
1610 {
1611     if (!(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'])) { die('Not allowed.'); }
1612     $LINKSDB = new LinkDB(
1613         $GLOBALS['config']['DATASTORE'],
1614         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
1615         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
1616     );
1617     $filename=$_FILES['filetoupload']['name'];
1618     $filesize=$_FILES['filetoupload']['size'];
1619     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1620     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1621     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1622     $import_count=0;
1623
1624     // Sniff file type:
1625     $type='unknown';
1626     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1627
1628     // Then import the bookmarks.
1629     if ($type=='netscape')
1630     {
1631         // This is a standard Netscape-style bookmark file.
1632         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1633         foreach(explode('<DT>',$data) as $html) // explode is very fast
1634         {
1635             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1636             $d = explode('<DD>',$html);
1637             if (startswith($d[0],'<A '))
1638             {
1639                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1640                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1641                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1642                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1643                 $raw_add_date=0;
1644                 foreach($matches as $m)
1645                 {
1646                     $attr=$m[1]; $value=$m[2];
1647                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1648                     elseif ($attr=='ADD_DATE')
1649                     {
1650                         $raw_add_date=intval($value);
1651                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1652                     }
1653                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1654                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1655                 }
1656                 if ($link['url']!='')
1657                 {
1658                     if ($private==1) $link['private']=1;
1659                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1660                     if ($dblink==false)
1661                     {  // Link not in database, let's import it...
1662                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1663
1664                        // Make sure date/time is not already used by another link.
1665                        // (Some bookmark files have several different links with the same ADD_DATE)
1666                        // We increment date by 1 second until we find a date which is not used in DB.
1667                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1668                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1669                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1670                        $LINKSDB[$link['linkdate']] = $link;
1671                        $import_count++;
1672                     }
1673                     else // Link already present in database.
1674                     {
1675                         if ($overwrite)
1676                         {   // If overwrite is required, we import link data, except date/time.
1677                             $link['linkdate']=$dblink['linkdate'];
1678                             $LINKSDB[$link['linkdate']] = $link;
1679                             $import_count++;
1680                         }
1681                     }
1682
1683                 }
1684             }
1685         }
1686         $LINKSDB->savedb();
1687
1688         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1689     }
1690     else
1691     {
1692         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1693     }
1694 }
1695
1696 // -----------------------------------------------------------------------------------------------
1697 // Template for the list of links (<div id="linklist">)
1698 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1699 function buildLinkList($PAGE,$LINKSDB)
1700 {
1701     // ---- Filter link database according to parameters
1702     $linksToDisplay=array();
1703     $search_type='';
1704     $search_crits='';
1705     if (isset($_GET['searchterm'])) // Fulltext search
1706     {
1707         $linksToDisplay = $LINKSDB->filterFulltext(trim($_GET['searchterm']));
1708         $search_crits=escape(trim($_GET['searchterm']));
1709         $search_type='fulltext';
1710     }
1711     elseif (isset($_GET['searchtags'])) // Search by tag
1712     {
1713         $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
1714         $search_crits=explode(' ',escape(trim($_GET['searchtags'])));
1715         $search_type='tags';
1716     }
1717     elseif (isset($_SERVER['QUERY_STRING']) && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/',$_SERVER['QUERY_STRING'])) // Detect smallHashes in URL
1718     {
1719         $linksToDisplay = $LINKSDB->filterSmallHash(substr(trim($_SERVER["QUERY_STRING"], '/'),0,6));
1720         if (count($linksToDisplay)==0)
1721         {
1722             header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
1723             echo '<h1>404 Not found.</h1>Oh crap. The link you are trying to reach does not exist or has been deleted.';
1724             echo '<br>You would mind <a href="?">clicking here</a>?';
1725             exit;
1726         }
1727         $search_type='permalink';
1728     }
1729     else
1730         $linksToDisplay = $LINKSDB;  // Otherwise, display without filtering.
1731
1732
1733     // Option: Show only private links
1734     if (!empty($_SESSION['privateonly']))
1735     {
1736         $tmp = array();
1737         foreach($linksToDisplay as $linkdate=>$link)
1738         {
1739             if ($link['private']!=0) $tmp[$linkdate]=$link;
1740         }
1741         $linksToDisplay=$tmp;
1742     }
1743
1744     // ---- Handle paging.
1745     /* Can someone explain to me why you get the following error when using array_keys() on an object which implements the interface ArrayAccess???
1746        "Warning: array_keys() expects parameter 1 to be array, object given in ... "
1747        If my class implements ArrayAccess, why won't array_keys() accept it ?  ( $keys=array_keys($linksToDisplay); )
1748     */
1749     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; } // Stupid and ugly. Thanks PHP.
1750
1751     // If there is only a single link, we change on-the-fly the title of the page.
1752     if (count($linksToDisplay)==1) $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1753
1754     // Select articles according to paging.
1755     $pagecount = ceil(count($keys)/$_SESSION['LINKS_PER_PAGE']);
1756     $pagecount = ($pagecount==0 ? 1 : $pagecount);
1757     $page=( empty($_GET['page']) ? 1 : intval($_GET['page']));
1758     $page = ( $page<1 ? 1 : $page );
1759     $page = ( $page>$pagecount ? $pagecount : $page );
1760     $i = ($page-1)*$_SESSION['LINKS_PER_PAGE']; // Start index.
1761     $end = $i+$_SESSION['LINKS_PER_PAGE'];
1762     $linkDisp=array(); // Links to display
1763     while ($i<$end && $i<count($keys))
1764     {
1765         $link = $linksToDisplay[$keys[$i]];
1766         $link['description']=nl2br(keepMultipleSpaces(text2clickable($link['description'])));
1767         $title=$link['title'];
1768         $classLi =  $i%2!=0 ? '' : 'publicLinkHightLight';
1769         $link['class'] = ($link['private']==0 ? $classLi : 'private');
1770         $link['timestamp']=linkdate2timestamp($link['linkdate']);
1771         $taglist = explode(' ',$link['tags']);
1772         uasort($taglist, 'strcasecmp');
1773         $link['taglist']=$taglist;
1774
1775         if ($link["url"][0] === '?' && // Check for both signs of a note: starting with ? and 7 chars long. I doubt that you'll post any links that look like this.
1776             strlen($link["url"]) === 7) {
1777             $link["url"] = indexUrl() . $link["url"];
1778         }
1779
1780         $linkDisp[$keys[$i]] = $link;
1781         $i++;
1782     }
1783
1784     // Compute paging navigation
1785     $searchterm= ( empty($_GET['searchterm']) ? '' : '&searchterm='.$_GET['searchterm'] );
1786     $searchtags= ( empty($_GET['searchtags']) ? '' : '&searchtags='.$_GET['searchtags'] );
1787     $paging='';
1788     $previous_page_url=''; if ($i!=count($keys)) $previous_page_url='?page='.($page+1).$searchterm.$searchtags;
1789     $next_page_url='';if ($page>1) $next_page_url='?page='.($page-1).$searchterm.$searchtags;
1790
1791     $token = ''; if (isLoggedIn()) $token=getToken();
1792
1793     // Fill all template fields.
1794     $PAGE->assign('linkcount',count($LINKSDB));
1795     $PAGE->assign('previous_page_url',$previous_page_url);
1796     $PAGE->assign('next_page_url',$next_page_url);
1797     $PAGE->assign('page_current',$page);
1798     $PAGE->assign('page_max',$pagecount);
1799     $PAGE->assign('result_count',count($linksToDisplay));
1800     $PAGE->assign('search_type',$search_type);
1801     $PAGE->assign('search_crits',$search_crits);
1802     $PAGE->assign('redirector',empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector']); // Optional redirector URL.
1803     $PAGE->assign('token',$token);
1804     $PAGE->assign('links',$linkDisp);
1805     $PAGE->assign('tags', $LINKSDB->allTags());
1806     return;
1807 }
1808
1809 // Compute the thumbnail for a link.
1810 //
1811 // With a link to the original URL.
1812 // Understands various services (youtube.com...)
1813 // Input: $url = URL for which the thumbnail must be found.
1814 //        $href = if provided, this URL will be followed instead of $url
1815 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1816 // Some of them may be missing.
1817 // Return an empty array if no thumbnail available.
1818 function computeThumbnail($url,$href=false)
1819 {
1820     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
1821     if ($href==false) $href=$url;
1822
1823     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1824     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1825     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1826     $domain = parse_url($url,PHP_URL_HOST);
1827     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1828     {
1829         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1830         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1831                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1832     }
1833     if ($domain=='youtu.be') // Youtube short links
1834     {
1835         $path = parse_url($url,PHP_URL_PATH);
1836         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1837                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1838     }
1839     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1840     {
1841         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1842         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1843                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1844     }
1845
1846     if ($domain=='imgur.com')
1847     {
1848         $path = parse_url($url,PHP_URL_PATH);
1849         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1850         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1851                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1852         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1853                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1854
1855         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1856                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1857     }
1858     if ($domain=='i.imgur.com')
1859     {
1860         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1861         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1862                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1863     }
1864     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1865     {
1866         if (strpos($url,'dailymotion.com/video/')!==false)
1867         {
1868             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1869             return array('src'=>$thumburl,
1870                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1871         }
1872     }
1873     if (endsWith($domain,'.imageshack.us'))
1874     {
1875         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1876         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1877         {
1878             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1879             return array('src'=>$thumburl,
1880                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1881         }
1882     }
1883
1884     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1885     // So we deport the thumbnail generation in order not to slow down page generation
1886     // (and we also cache the thumbnail)
1887
1888     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1889
1890     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1891         || $domain=='vimeo.com'
1892         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1893         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1894     )
1895     {
1896         if ($domain=='vimeo.com')
1897         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1898             $path = parse_url($url,PHP_URL_PATH);
1899             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1900         }
1901         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
1902         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
1903             $path = parse_url($url,PHP_URL_PATH);
1904             if (!preg_match('!/\d+.+?!',$path)) return array();
1905         }
1906         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
1907         {   // Make sure this TED URL points to a video (/talks/...)
1908             $path = parse_url($url,PHP_URL_PATH);
1909             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
1910         }
1911         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1912         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1913                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1914     }
1915
1916     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1917     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1918     // But using the extension will do.
1919     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1920     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1921     {
1922         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1923         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1924                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1925     }
1926     return array(); // No thumbnail.
1927
1928 }
1929
1930
1931 // Returns the HTML code to display a thumbnail for a link
1932 // with a link to the original URL.
1933 // Understands various services (youtube.com...)
1934 // Input: $url = URL for which the thumbnail must be found.
1935 //        $href = if provided, this URL will be followed instead of $url
1936 // Returns '' if no thumbnail available.
1937 function thumbnail($url,$href=false)
1938 {
1939     $t = computeThumbnail($url,$href);
1940     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1941
1942     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
1943     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1944     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1945     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1946     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1947     $html.='></a>';
1948     return $html;
1949 }
1950
1951 // Returns the HTML code to display a thumbnail for a link
1952 // for the picture wall (using lazy image loading)
1953 // Understands various services (youtube.com...)
1954 // Input: $url = URL for which the thumbnail must be found.
1955 //        $href = if provided, this URL will be followed instead of $url
1956 // Returns '' if no thumbnail available.
1957 function lazyThumbnail($url,$href=false)
1958 {
1959     $t = computeThumbnail($url,$href);
1960     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1961
1962     $html='<a href="'.escape($t['href']).'">';
1963
1964     // Lazy image
1965     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
1966
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.='>';
1972
1973     // No-JavaScript fallback.
1974     $html.='<noscript><img src="'.escape($t['src']).'"';
1975     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1976     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1977     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1978     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1979     $html.='></noscript></a>';
1980
1981     return $html;
1982 }
1983
1984
1985 // -----------------------------------------------------------------------------------------------
1986 // Installation
1987 // This function should NEVER be called if the file data/config.php exists.
1988 function install()
1989 {
1990     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
1991     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
1992
1993
1994     // This part makes sure sessions works correctly.
1995     // (Because on some hosts, session.save_path may not be set correctly,
1996     // or we may not have write access to it.)
1997     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
1998     {   // Step 2: Check if data in session is correct.
1999         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2000         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2001         echo 'It currently points to '.session_save_path().'<br>';
2002         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2003         echo '<br><a href="?">Click to try again.</a></pre>';
2004         die;
2005     }
2006     if (!isset($_SESSION['session_tested']))
2007     {   // Step 1 : Try to store data in session and reload page.
2008         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2009         header('Location: '.indexUrl().'?test_session');  // Redirect to check stored data.
2010     }
2011     if (isset($_GET['test_session']))
2012     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2013         header('Location: '.indexUrl());
2014     }
2015
2016
2017     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2018     {
2019         $tz = 'UTC';
2020         if (!empty($_POST['continent']) && !empty($_POST['city']))
2021             if (isTZvalid($_POST['continent'],$_POST['city']))
2022                 $tz = $_POST['continent'].'/'.$_POST['city'];
2023         $GLOBALS['timezone'] = $tz;
2024         // Everything is ok, let's create config file.
2025         $GLOBALS['login'] = $_POST['setlogin'];
2026         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2027         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2028         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(indexUrl()) : $_POST['title'] );
2029         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2030         try {
2031             writeConfig($GLOBALS, isLoggedIn());
2032         }
2033         catch(Exception $e) {
2034             error_log(
2035                     'ERROR while writing config file after installation.' . PHP_EOL .
2036                     $e->getMessage()
2037                 );
2038
2039             // TODO: do not handle exceptions/errors in JS.
2040             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2041             exit;
2042         }
2043         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2044         exit;
2045     }
2046
2047     // Display config form:
2048     list($timezone_form,$timezone_js) = templateTZform();
2049     $timezone_html=''; if ($timezone_form!='') $timezone_html='<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2050
2051     $PAGE = new pageBuilder;
2052     $PAGE->assign('timezone_html',$timezone_html);
2053     $PAGE->assign('timezone_js',$timezone_js);
2054     $PAGE->renderPage('install');
2055     exit;
2056 }
2057
2058 // Generates the timezone selection form and JavaScript.
2059 // Input: (optional) current timezone (can be 'UTC/UTC'). It will be pre-selected.
2060 // Output: array(html,js)
2061 // Example: list($htmlform,$js) = templateTZform('Europe/Paris');  // Europe/Paris pre-selected.
2062 // Returns array('','') if server does not support timezones list. (e.g. PHP 5.1 on free.fr)
2063 function templateTZform($ptz=false)
2064 {
2065     if (function_exists('timezone_identifiers_list')) // because of old PHP version (5.1) which can be found on free.fr
2066     {
2067         // Try to split the provided timezone.
2068         if ($ptz==false) { $l=timezone_identifiers_list(); $ptz=$l[0]; }
2069         $spos=strpos($ptz,'/'); $pcontinent=substr($ptz,0,$spos); $pcity=substr($ptz,$spos+1);
2070
2071         // Display config form:
2072         $timezone_form = '';
2073         $timezone_js = '';
2074         // The list is in the form "Europe/Paris", "America/Argentina/Buenos_Aires"...
2075         // We split the list in continents/cities.
2076         $continents = array();
2077         $cities = array();
2078         foreach(timezone_identifiers_list() as $tz)
2079         {
2080             if ($tz=='UTC') $tz='UTC/UTC';
2081             $spos = strpos($tz,'/');
2082             if ($spos!==false)
2083             {
2084                 $continent=substr($tz,0,$spos); $city=substr($tz,$spos+1);
2085                 $continents[$continent]=1;
2086                 if (!isset($cities[$continent])) $cities[$continent]='';
2087                 $cities[$continent].='<option value="'.$city.'"'.($pcity==$city?' selected':'').'>'.$city.'</option>';
2088             }
2089         }
2090         $continents_html = '';
2091         $continents = array_keys($continents);
2092         foreach($continents as $continent)
2093             $continents_html.='<option  value="'.$continent.'"'.($pcontinent==$continent?' selected':'').'>'.$continent.'</option>';
2094         $cities_html = $cities[$pcontinent];
2095         $timezone_form = "Continent: <select name=\"continent\" id=\"continent\" onChange=\"onChangecontinent();\">${continents_html}</select>";
2096         $timezone_form .= "&nbsp;&nbsp;&nbsp;&nbsp;City: <select name=\"city\" id=\"city\">${cities[$pcontinent]}</select><br />";
2097         $timezone_js = "<script>";
2098         $timezone_js .= "function onChangecontinent(){document.getElementById(\"city\").innerHTML = citiescontinent[document.getElementById(\"continent\").value];}";
2099         $timezone_js .= "var citiescontinent = ".json_encode($cities).";" ;
2100         $timezone_js .= "</script>" ;
2101         return array($timezone_form,$timezone_js);
2102     }
2103     return array('','');
2104 }
2105
2106 // Tells if a timezone is valid or not.
2107 // If not valid, returns false.
2108 // If system does not support timezone list, returns false.
2109 function isTZvalid($continent,$city)
2110 {
2111     $tz = $continent.'/'.$city;
2112     if (function_exists('timezone_identifiers_list')) // because of old PHP version (5.1) which can be found on free.fr
2113     {
2114         if (in_array($tz, timezone_identifiers_list())) // it's a valid timezone?
2115                     return true;
2116     }
2117     return false;
2118 }
2119 if (!function_exists('json_encode')) {
2120     function json_encode($data) {
2121         switch ($type = gettype($data)) {
2122             case 'NULL':
2123                 return 'null';
2124             case 'boolean':
2125                 return ($data ? 'true' : 'false');
2126             case 'integer':
2127             case 'double':
2128             case 'float':
2129                 return $data;
2130             case 'string':
2131                 return '"' . addslashes($data) . '"';
2132             case 'object':
2133                 $data = get_object_vars($data);
2134             case 'array':
2135                 $output_index_count = 0;
2136                 $output_indexed = array();
2137                 $output_associative = array();
2138                 foreach ($data as $key => $value) {
2139                     $output_indexed[] = json_encode($value);
2140                     $output_associative[] = json_encode($key) . ':' . json_encode($value);
2141                     if ($output_index_count !== NULL && $output_index_count++ !== $key) {
2142                         $output_index_count = NULL;
2143                     }
2144                 }
2145                 if ($output_index_count !== NULL) {
2146                     return '[' . implode(',', $output_indexed) . ']';
2147                 } else {
2148                     return '{' . implode(',', $output_associative) . '}';
2149                 }
2150             default:
2151                 return ''; // Not supported
2152         }
2153     }
2154 }
2155
2156
2157
2158 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2159    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2160    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2161    This function is called by passing the URL:
2162    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2163    [URL] is the URL of the link (e.g. a flickr page)
2164    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2165    The function below will fetch the image from the webservice and store it in the cache.
2166 */
2167 function genThumbnail()
2168 {
2169     // Make sure the parameters in the URL were generated by us.
2170     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2171     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2172
2173     // Let's see if we don't already have the image for this URL in the cache.
2174     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2175     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2176     {   // We have the thumbnail, just serve it:
2177         header('Content-Type: image/jpeg');
2178         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2179         return;
2180     }
2181     // We may also serve a blank image (if service did not respond)
2182     $blankname=hash('sha1',$_GET['url']).'.gif';
2183     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2184     {
2185         header('Content-Type: image/gif');
2186         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2187         return;
2188     }
2189
2190     // Otherwise, generate the thumbnail.
2191     $url = $_GET['url'];
2192     $domain = parse_url($url,PHP_URL_HOST);
2193
2194     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2195     {
2196         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2197         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2198
2199         // Is this a link to an image, or to a flickr page ?
2200         $imageurl='';
2201         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2202         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2203             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2204             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2205         }
2206         else // This is a flickr page (html)
2207         {
2208             list($httpstatus,$headers,$data) = getHTTP($url,20); // Get the flickr html page.
2209             if (strpos($httpstatus,'200 OK')!==false)
2210             {
2211                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2212                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!',$data,$matches);
2213                 if (!empty($matches[1])) $imageurl=$matches[1];
2214
2215                 // In albums (and some other pages), the link rel="image_src" is not provided,
2216                 // but flickr provides:
2217                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2218                 if ($imageurl=='')
2219                 {
2220                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!',$data,$matches);
2221                     if (!empty($matches[1])) $imageurl=$matches[1];
2222                 }
2223             }
2224         }
2225
2226         if ($imageurl!='')
2227         {   // Let's download the image.
2228             list($httpstatus,$headers,$data) = getHTTP($imageurl,10); // Image is 240x120, so 10 seconds to download should be enough.
2229             if (strpos($httpstatus,'200 OK')!==false)
2230             {
2231                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2232                 header('Content-Type: image/jpeg');
2233                 echo $data;
2234                 return;
2235             }
2236         }
2237     }
2238
2239     elseif ($domain=='vimeo.com' )
2240     {
2241         // This is more complex: we have to perform a HTTP request, then parse the result.
2242         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2243         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2244         list($httpstatus,$headers,$data) = getHTTP('https://vimeo.com/api/v2/video/'.escape($vid).'.php',5);
2245         if (strpos($httpstatus,'200 OK')!==false)
2246         {
2247             $t = unserialize($data);
2248             $imageurl = $t[0]['thumbnail_medium'];
2249             // Then we download the image and serve it to our client.
2250             list($httpstatus,$headers,$data) = getHTTP($imageurl,10);
2251             if (strpos($httpstatus,'200 OK')!==false)
2252             {
2253                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2254                 header('Content-Type: image/jpeg');
2255                 echo $data;
2256                 return;
2257             }
2258         }
2259     }
2260
2261     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2262     {
2263         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2264         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2265         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2266         list($httpstatus,$headers,$data) = getHTTP($url,5);
2267         if (strpos($httpstatus,'200 OK')!==false)
2268         {
2269             // Extract the link to the thumbnail
2270             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!',$data,$matches);
2271             if (!empty($matches[1]))
2272             {   // Let's download the image.
2273                 $imageurl=$matches[1];
2274                 list($httpstatus,$headers,$data) = getHTTP($imageurl,20); // No control on image size, so wait long enough.
2275                 if (strpos($httpstatus,'200 OK')!==false)
2276                 {
2277                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2278                     file_put_contents($filepath,$data); // Save image to cache.
2279                     if (resizeImage($filepath))
2280                     {
2281                         header('Content-Type: image/jpeg');
2282                         echo file_get_contents($filepath);
2283                         return;
2284                     }
2285                 }
2286             }
2287         }
2288     }
2289
2290     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2291     {
2292         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2293         // http://xkcd.com/327/
2294         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2295         list($httpstatus,$headers,$data) = getHTTP($url,5);
2296         if (strpos($httpstatus,'200 OK')!==false)
2297         {
2298             // Extract the link to the thumbnail
2299             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!',$data,$matches);
2300             if (!empty($matches[1]))
2301             {   // Let's download the image.
2302                 $imageurl=$matches[1];
2303                 list($httpstatus,$headers,$data) = getHTTP($imageurl,20); // No control on image size, so wait long enough.
2304                 if (strpos($httpstatus,'200 OK')!==false)
2305                 {
2306                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2307                     file_put_contents($filepath,$data); // Save image to cache.
2308                     if (resizeImage($filepath))
2309                     {
2310                         header('Content-Type: image/jpeg');
2311                         echo file_get_contents($filepath);
2312                         return;
2313                     }
2314                 }
2315             }
2316         }
2317     }
2318
2319     else
2320     {
2321         // For all other domains, we try to download the image and make a thumbnail.
2322         list($httpstatus,$headers,$data) = getHTTP($url,30);  // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2323         if (strpos($httpstatus,'200 OK')!==false)
2324         {
2325             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2326             file_put_contents($filepath,$data); // Save image to cache.
2327             if (resizeImage($filepath))
2328             {
2329                 header('Content-Type: image/jpeg');
2330                 echo file_get_contents($filepath);
2331                 return;
2332             }
2333         }
2334     }
2335
2336
2337     // Otherwise, return an empty image (8x8 transparent gif)
2338     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2339     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2340     header('Content-Type: image/gif');
2341     echo $blankgif;
2342 }
2343
2344 // Make a thumbnail of the image (to width: 120 pixels)
2345 // Returns true if success, false otherwise.
2346 function resizeImage($filepath)
2347 {
2348     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2349
2350     // Trick: some stupid people rename GIF as JPEG... or else.
2351     // So we really try to open each image type whatever the extension is.
2352     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2353     $im=false;
2354     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2355     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2356     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2357     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2358     $w = imagesx($im);
2359     $h = imagesy($im);
2360     $ystart = 0; $yheight=$h;
2361     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2362     $nw = 120;   // Desired width
2363     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2364     // Resize image:
2365     $im2 = imagecreatetruecolor($nw,$nh);
2366     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2367     imageinterlace($im2,true); // For progressive JPEG.
2368     $tempname=$filepath.'_TEMP.jpg';
2369     imagejpeg($im2, $tempname, 90);
2370     imagedestroy($im);
2371     imagedestroy($im2);
2372     unlink($filepath);
2373     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2374     return true;
2375 }
2376
2377 // Invalidate caches when the database is changed or the user logs out.
2378 // (e.g. tags cache).
2379 function invalidateCaches()
2380 {
2381     unset($_SESSION['tags']);  // Purge cache attached to session.
2382     pageCache::purgeCache();   // Purge page cache shared by sessions.
2383 }
2384
2385 try {
2386     mergeDeprecatedConfig($GLOBALS, isLoggedIn());
2387 } catch(Exception $e) {
2388     error_log(
2389         'ERROR while merging deprecated options.php file.' . PHP_EOL .
2390         $e->getMessage()
2391     );
2392 }
2393
2394 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2395 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2396 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2397 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2398 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=daily')) { showDaily(); exit; }
2399 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2400 renderPage();
2401 ?>