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,$_SERVER['SERVER_NAME']); // Set default cookie expiration and path.
  48
  49 // Set session parameters on server side.
  50 define('INACTIVITY_TIMEOUT',3600); // (in seconds). If the user does not access any page within this time, his/her session is considered expired.
  51 ini_set('session.use_cookies', 1);       // Use cookies to store session.
  52 ini_set('session.use_only_cookies', 1);  // Force cookies for session (phpsessionID forbidden in URL).
  53 ini_set('session.use_trans_sid', false); // Prevent PHP form using sessionID in URL if cookies are disabled.
  54 session_name('shaarli');
  55 if (session_id() == '') session_start();  // Start session if needed (Some server auto-start sessions).
  56
  57 // PHP Settings
  58 ini_set('max_input_time','60');  // High execution time in case of problematic imports/exports.
  59 ini_set('memory_limit', '128M');  // Try to set max upload file size and read (May not work on some hosts).
  60 ini_set('post_max_size', '16M');
  61 ini_set('upload_max_filesize', '16M');
  62 checkphpversion();
  63 error_reporting(E_ALL^E_WARNING);  // See all error except warnings.
  64 //error_reporting(-1); // See all errors (for debugging only)
  65
  66 // User configuration
  67 if (is_file($GLOBALS['config']['CONFIG_FILE'])) {
  68     require_once $GLOBALS['config']['CONFIG_FILE'];
  69 }
  70
  71 // Shaarli library
  72 require_once 'application/LinkDB.php';
  73 require_once 'application/Utils.php';
  74 require_once 'application/Config.php';
  75
  76 include "inc/rain.tpl.class.php"; //include Rain TPL
  77 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
  78 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
  79
  80 ob_start();  // Output buffering for the page cache.
  81
  82
  83 // In case stupid admin has left magic_quotes enabled in php.ini:
  84 if (get_magic_quotes_gpc())
  85 {
  86     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
  87     $_POST = array_map('stripslashes_deep', $_POST);
  88     $_GET = array_map('stripslashes_deep', $_GET);
  89     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
  90 }
  91
  92 // Prevent caching on client side or proxy: (yes, it's ugly)
  93 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
  94 header("Cache-Control: no-store, no-cache, must-revalidate");
  95 header("Cache-Control: post-check=0, pre-check=0", false);
  96 header("Pragma: no-cache");
  97
  98 // Directories creations (Note that your web host may require different rights than 705.)
  99 if (!is_writable(realpath(dirname(__FILE__)))) die('<pre>ERROR: Shaarli does not have the right to write in its own directory.</pre>');
 100
 101 // Handling of old config file which do not have the new parameters.
 102 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(indexUrl());
 103 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 104 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 105 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 106 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 107 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 108 // I really need to rewrite Shaarli with a proper configuation manager.
 109
 110 // Run config screen if first run:
 111 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 112     install();
 113 }
 114
 115 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 116 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 117 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 118
 119 // a token depending of deployment salt, user password, and the current ip
 120 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 121
 122 autoLocale(); // Sniff browser language and set date format accordingly.
 123 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 124
 125 //==================================================================================================
 126 // Checking session state (i.e. is the user still logged in)
 127 //==================================================================================================
 128
 129 function setup_login_state() {
 130         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 131         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 132         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 133             $userIsLoggedIn = true;
 134         }
 135         if (!isset($GLOBALS['login'])) {
 136             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 137             $loginFailure = true;
 138         }
 139         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 140             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 141             !$loginFailure)
 142         {
 143             fillSessionInfo();
 144             $userIsLoggedIn = true;
 145         }
 146         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 147         if (empty($_SESSION['uid']) ||
 148             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 149             time() >= $_SESSION['expires_on'])
 150         {
 151             logout();
 152             $userIsLoggedIn = false;
 153             $loginFailure = true;
 154         }
 155         if (!empty($_SESSION['longlastingsession'])) {
 156             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 157         }
 158         else {
 159             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 160         }
 161         if (!$loginFailure) {
 162             $userIsLoggedIn = true;
 163         }
 164
 165         return $userIsLoggedIn;
 166 }
 167 //==================================================================================================
 168 $userIsLoggedIn = setup_login_state();
 169 //==================================================================================================
 170 //==================================================================================================
 171
 172 // Check PHP version
 173 function checkphpversion()
 174 {
 175     if (version_compare(PHP_VERSION, '5.1.0') < 0)
 176     {
 177         header('Content-Type: text/plain; charset=utf-8');
 178         echo 'Your PHP version is obsolete! Shaarli requires at least php 5.1.0, and thus cannot run. Sorry. Your PHP version has known security vulnerabilities and should be updated as soon as possible.';
 179         exit;
 180     }
 181 }
 182
 183 // Checks if an update is available for Shaarli.
 184 // (at most once a day, and only for registered user.)
 185 // Output: '' = no new version.
 186 //         other= the available version.
 187 function checkUpdate()
 188 {
 189     if (!isLoggedIn()) return ''; // Do not check versions for visitors.
 190     if (empty($GLOBALS['config']['ENABLE_UPDATECHECK'])) return ''; // Do not check if the user doesn't want to.
 191
 192     // Get latest version number at most once a day.
 193     if (!is_file($GLOBALS['config']['UPDATECHECK_FILENAME']) || (filemtime($GLOBALS['config']['UPDATECHECK_FILENAME'])<time()-($GLOBALS['config']['UPDATECHECK_INTERVAL'])))
 194     {
 195         $version=shaarli_version;
 196         list($httpstatus,$headers,$data) = getHTTP('https://raw.githubusercontent.com/shaarli/Shaarli/master/shaarli_version.php',2);
 197         if (strpos($httpstatus,'200 OK')!==false) $version=str_replace(' */ ?>','',str_replace('<?php /* ','',$data));
 198         // If failed, never mind. We don't want to bother the user with that.
 199         file_put_contents($GLOBALS['config']['UPDATECHECK_FILENAME'],$version); // touch file date
 200     }
 201     // Compare versions:
 202     $newestversion=file_get_contents($GLOBALS['config']['UPDATECHECK_FILENAME']);
 203     if (version_compare($newestversion,shaarli_version)==1) return $newestversion;
 204     return '';
 205 }
 206
 207
 208 // -----------------------------------------------------------------------------------------------
 209 // Simple cache system (mainly for the RSS/ATOM feeds).
 210
 211 class pageCache
 212 {
 213     private $url; // Full URL of the page to cache (typically the value returned by pageUrl())
 214     private $shouldBeCached; // boolean: Should this url be cached?
 215     private $filename; // Name of the cache file for this url.
 216
 217     /*
 218          $url = URL (typically the value returned by pageUrl())
 219          $shouldBeCached = boolean. If false, the cache will be disabled.
 220     */
 221     public function __construct($url,$shouldBeCached)
 222     {
 223         $this->url = $url;
 224         $this->filename = $GLOBALS['config']['PAGECACHE'].'/'.sha1($url).'.cache';
 225         $this->shouldBeCached = $shouldBeCached;
 226     }
 227
 228     // If the page should be cached and a cached version exists,
 229     // returns the cached version (otherwise, return null).
 230     public function cachedVersion()
 231     {
 232         if (!$this->shouldBeCached) return null;
 233         if (is_file($this->filename)) { return file_get_contents($this->filename); exit; }
 234         return null;
 235     }
 236
 237     // Put a page in the cache.
 238     public function cache($page)
 239     {
 240         if (!$this->shouldBeCached) return;
 241         file_put_contents($this->filename,$page);
 242     }
 243
 244     // Purge the whole cache.
 245     // (call with pageCache::purgeCache())
 246     public static function purgeCache()
 247     {
 248         if (is_dir($GLOBALS['config']['PAGECACHE']))
 249         {
 250             $handler = opendir($GLOBALS['config']['PAGECACHE']);
 251             if ($handler!==false)
 252             {
 253                 while (($filename = readdir($handler))!==false)
 254                 {
 255                     if (endsWith($filename,'.cache')) { unlink($GLOBALS['config']['PAGECACHE'].'/'.$filename); }
 256                 }
 257                 closedir($handler);
 258             }
 259         }
 260     }
 261
 262 }
 263
 264
 265 // -----------------------------------------------------------------------------------------------
 266 // Log to text file
 267 function logm($message)
 268 {
 269     $t = strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n";
 270     file_put_contents($GLOBALS['config']['DATADIR'].'/log.txt',$t,FILE_APPEND);
 271 }
 272
 273 // In a string, converts URLs to clickable links.
 274 // Function inspired from http://www.php.net/manual/en/function.preg-replace.php#85722
 275 function text2clickable($url)
 276 {
 277     $redir = empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'];
 278     return preg_replace('!(((?:https?|ftp|file)://|apt:|magnet:)\S+[[:alnum:]]/?)!si','<a href="'.$redir.'$1" rel="nofollow">$1</a>',$url);
 279 }
 280
 281 // This function inserts &nbsp; where relevant so that multiple spaces are properly displayed in HTML
 282 // even in the absence of <pre>  (This is used in description to keep text formatting)
 283 function keepMultipleSpaces($text)
 284 {
 285     return str_replace('  ',' &nbsp;',$text);
 286
 287 }
 288 // ------------------------------------------------------------------------------------------
 289 // Sniff browser language to display dates in the right format automatically.
 290 // (Note that is may not work on your server if the corresponding local is not installed.)
 291 function autoLocale()
 292 {
 293     $attempts = array('en_US'); // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 294     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 295     {   // (It's a bit crude, but it works very well. Preferred language is always presented first.)
 296         if (preg_match('/([a-z]{2})-?([a-z]{2})?/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) {
 297             $loc = $matches[1] . (!empty($matches[2]) ? '_' . strtoupper($matches[2]) : '');
 298             $attempts = array($loc.'.UTF-8', $loc, str_replace('_', '-', $loc).'.UTF-8', str_replace('_', '-', $loc),
 299                 $loc . '_' . strtoupper($loc).'.UTF-8', $loc . '_' . strtoupper($loc),
 300                 $loc . '_' . $loc.'.UTF-8', $loc . '_' . $loc, $loc . '-' . strtoupper($loc).'.UTF-8',
 301                 $loc . '-' . strtoupper($loc), $loc . '-' . $loc.'.UTF-8', $loc . '-' . $loc);
 302         }
 303     }
 304     setlocale(LC_TIME, $attempts);  // LC_TIME = Set local for date/time format only.
 305 }
 306
 307 // ------------------------------------------------------------------------------------------
 308 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 309 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 310 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 311 function pubsubhub()
 312 {
 313     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 314     {
 315        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 316        $topic_url = array (
 317                        indexUrl().'?do=atom',
 318                        indexUrl().'?do=rss'
 319                     );
 320        $p->publish_update($topic_url);
 321     }
 322 }
 323
 324 // ------------------------------------------------------------------------------------------
 325 // Session management
 326
 327 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 328 function allIPs()
 329 {
 330     $ip = $_SERVER["REMOTE_ADDR"];
 331     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 332     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 333     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 334     return $ip;
 335 }
 336
 337 function fillSessionInfo() {
 338         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 339         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 340         $_SESSION['username']=$GLOBALS['login'];
 341         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 342 }
 343
 344 // Check that user/password is correct.
 345 function check_auth($login,$password)
 346 {
 347     $hash = sha1($password.$login.$GLOBALS['salt']);
 348     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 349     {   // Login/password is correct.
 350                 fillSessionInfo();
 351         logm('Login successful');
 352         return True;
 353     }
 354     logm('Login failed for user '.$login);
 355     return False;
 356 }
 357
 358 // Returns true if the user is logged in.
 359 function isLoggedIn()
 360 {
 361     global $userIsLoggedIn;
 362     return $userIsLoggedIn;
 363 }
 364
 365 // Force logout.
 366 function logout() {
 367     if (isset($_SESSION)) {
 368         unset($_SESSION['uid']);
 369         unset($_SESSION['ip']);
 370         unset($_SESSION['username']);
 371         unset($_SESSION['privateonly']);
 372     }
 373     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 374 }
 375
 376
 377 // ------------------------------------------------------------------------------------------
 378 // Brute force protection system
 379 // Several consecutive failed logins will ban the IP address for 30 minutes.
 380 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?>");
 381 include $GLOBALS['config']['IPBANS_FILENAME'];
 382 // Signal a failed login. Will ban the IP if too many failures:
 383 function ban_loginFailed()
 384 {
 385     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 386     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 387     $gb['FAILURES'][$ip]++;
 388     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 389     {
 390         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 391         logm('IP address banned from login');
 392     }
 393     $GLOBALS['IPBANS'] = $gb;
 394     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 395 }
 396
 397 // Signals a successful login. Resets failed login counter.
 398 function ban_loginOk()
 399 {
 400     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 401     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 402     $GLOBALS['IPBANS'] = $gb;
 403     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 404 }
 405
 406 // Checks if the user CAN login. If 'true', the user can try to login.
 407 function ban_canLogin()
 408 {
 409     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 410     if (isset($gb['BANS'][$ip]))
 411     {
 412         // User is banned. Check if the ban has expired:
 413         if ($gb['BANS'][$ip]<=time())
 414         {   // Ban expired, user can try to login again.
 415             logm('Ban lifted.');
 416             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 417             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 418             return true; // Ban has expired, user can login.
 419         }
 420         return false; // User is banned.
 421     }
 422     return true; // User is not banned.
 423 }
 424
 425 // ------------------------------------------------------------------------------------------
 426 // Process login form: Check if login/password is correct.
 427 if (isset($_POST['login']))
 428 {
 429     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 430     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 431     {   // Login/password is OK.
 432         ban_loginOk();
 433         // If user wants to keep the session cookie even after the browser closes:
 434         if (!empty($_POST['longlastingsession']))
 435         {
 436                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 437             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 438             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 439
 440             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 441             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 442             // Note: Never forget the trailing slash on the cookie path!
 443             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 444         }
 445         else // Standard session expiration (=when browser closes)
 446         {
 447             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 448             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 449             session_regenerate_id(true);
 450         }
 451         // Optional redirect after login:
 452         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; }
 453         if (isset($_POST['returnurl']))
 454         {
 455             if (endsWith($_POST['returnurl'],'?do=login')) { header('Location: ?'); exit; } // Prevent loops over login screen.
 456             header('Location: '.$_POST['returnurl']); exit;
 457         }
 458         header('Location: ?'); exit;
 459     }
 460     else
 461     {
 462         ban_loginFailed();
 463         $redir = '';
 464         if (isset($_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']):''); }
 465         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 466         exit;
 467     }
 468 }
 469
 470 // ------------------------------------------------------------------------------------------
 471 // Misc utility functions:
 472
 473 // Returns the server URL (including port and http/https), without path.
 474 // e.g. "http://myserver.com:8080"
 475 // You can append $_SERVER['SCRIPT_NAME'] to get the current script URL.
 476 function serverUrl()
 477 {
 478     $https = (!empty($_SERVER['HTTPS']) && (strtolower($_SERVER['HTTPS'])=='on')) || $_SERVER["SERVER_PORT"]=='443'; // HTTPS detection.
 479     $serverport = ($_SERVER["SERVER_PORT"]=='80' || ($https && $_SERVER["SERVER_PORT"]=='443') ? '' : ':'.$_SERVER["SERVER_PORT"]);
 480     return 'http'.($https?'s':'').'://'.$_SERVER['SERVER_NAME'].$serverport;
 481 }
 482
 483 // Returns the absolute URL of current script, without the query.
 484 // (e.g. http://sebsauvage.net/links/)
 485 function indexUrl()
 486 {
 487     $scriptname = $_SERVER["SCRIPT_NAME"];
 488     // If the script is named 'index.php', we remove it (for better looking URLs,
 489     // e.g. http://mysite.com/shaarli/?abcde instead of http://mysite.com/shaarli/index.php?abcde)
 490     if (endswith($scriptname,'index.php')) $scriptname = substr($scriptname,0,strlen($scriptname)-9);
 491     return serverUrl() . $scriptname;
 492 }
 493
 494 // Returns the absolute URL of current script, WITH the query.
 495 // (e.g. http://sebsauvage.net/links/?toto=titi&spamspamspam=humbug)
 496 function pageUrl()
 497 {
 498     return indexUrl().(!empty($_SERVER["QUERY_STRING"]) ? '?'.$_SERVER["QUERY_STRING"] : '');
 499 }
 500
 501 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 502 function return_bytes($val)
 503 {
 504     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 505     switch($last)
 506     {
 507         case 'g': $val *= 1024;
 508         case 'm': $val *= 1024;
 509         case 'k': $val *= 1024;
 510     }
 511     return $val;
 512 }
 513
 514 // Try to determine max file size for uploads (POST).
 515 // Returns an integer (in bytes)
 516 function getMaxFileSize()
 517 {
 518     $size1 = return_bytes(ini_get('post_max_size'));
 519     $size2 = return_bytes(ini_get('upload_max_filesize'));
 520     // Return the smaller of two:
 521     $maxsize = min($size1,$size2);
 522     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 523     return $maxsize;
 524 }
 525
 526 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 527     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 528     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 529 function linkdate2timestamp($linkdate)
 530 {
 531     if(strcmp($linkdate, '_000000') !== 0 || !$linkdate){
 532         $Y=$M=$D=$h=$m=$s=0;
 533         $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 534         return mktime($h,$m,$s,$M,$D,$Y);
 535     }
 536     return time();
 537 }
 538
 539 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 540     (used to build the pubDate attribute in RSS feed.)  */
 541 function linkdate2rfc822($linkdate)
 542 {
 543     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 544 }
 545
 546 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 547     (used to build the updated tags in ATOM feed.)  */
 548 function linkdate2iso8601($linkdate)
 549 {
 550     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 551 }
 552
 553 // Parse HTTP response headers and return an associative array.
 554 function http_parse_headers_shaarli( $headers )
 555 {
 556     $res=array();
 557     foreach($headers as $header)
 558     {
 559         $i = strpos($header,': ');
 560         if ($i!==false)
 561         {
 562             $key=substr($header,0,$i);
 563             $value=substr($header,$i+2,strlen($header)-$i-2);
 564             $res[$key]=$value;
 565         }
 566     }
 567     return $res;
 568 }
 569
 570 /* GET an URL.
 571    Input: $url : URL to get (http://...)
 572           $timeout : Network timeout (will wait this many seconds for an anwser before giving up).
 573    Output: An array.  [0] = HTTP status message (e.g. "HTTP/1.1 200 OK") or error message
 574                       [1] = associative array containing HTTP response headers (e.g. echo getHTTP($url)[1]['Content-Type'])
 575                       [2] = data
 576     Example: list($httpstatus,$headers,$data) = getHTTP('http://sebauvage.net/');
 577              if (strpos($httpstatus,'200 OK')!==false)
 578                  echo 'Data type: '.htmlspecialchars($headers['Content-Type']);
 579              else
 580                  echo 'There was an error: '.htmlspecialchars($httpstatus)
 581 */
 582 function getHTTP($url,$timeout=30)
 583 {
 584     try
 585     {
 586         $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
 587         $context = stream_context_create($options);
 588         $data=file_get_contents($url,false,$context,-1, 4000000); // We download at most 4 Mb from source.
 589         if (!$data) { return array('HTTP Error',array(),''); }
 590         $httpStatus=$http_response_header[0]; // e.g. "HTTP/1.1 200 OK"
 591         $responseHeaders=http_parse_headers_shaarli($http_response_header);
 592         return array($httpStatus,$responseHeaders,$data);
 593     }
 594     catch (Exception $e)  // getHTTP *can* fail silently (we don't care if the title cannot be fetched)
 595     {
 596         return array($e->getMessage(),'','');
 597     }
 598 }
 599
 600 // Extract title from an HTML document.
 601 // (Returns an empty string if not found.)
 602 function html_extract_title($html)
 603 {
 604   return preg_match('!<title>(.*?)</title>!is', $html, $matches) ? trim(str_replace("\n",' ', $matches[1])) : '' ;
 605 }
 606
 607 // ------------------------------------------------------------------------------------------
 608 // Token management for XSRF protection
 609 // Token should be used in any form which acts on data (create,update,delete,import...).
 610 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 611
 612 // Returns a token.
 613 function getToken()
 614 {
 615     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 616     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 617     return $rnd;
 618 }
 619
 620 // Tells if a token is OK. Using this function will destroy the token.
 621 // true=token is OK.
 622 function tokenOk($token)
 623 {
 624     if (isset($_SESSION['tokens'][$token]))
 625     {
 626         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 627         return true; // Token is OK.
 628     }
 629     return false; // Wrong token, or already used.
 630 }
 631
 632 // ------------------------------------------------------------------------------------------
 633 /* This class is in charge of building the final page.
 634    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 635    p = new pageBuilder;
 636    p.assign('myfield','myvalue');
 637    p.renderPage('mytemplate');
 638
 639 */
 640 class pageBuilder
 641 {
 642     private $tpl; // RainTPL template
 643
 644     function __construct()
 645     {
 646         $this->tpl=false;
 647     }
 648
 649     private function initialize()
 650     {
 651         $this->tpl = new RainTPL;
 652         $this->tpl->assign('newversion',escape(checkUpdate()));
 653         $this->tpl->assign('feedurl',escape(indexUrl()));
 654         $searchcrits=''; // Search criteria
 655         if (!empty($_GET['searchtags'])) $searchcrits.='&searchtags='.urlencode($_GET['searchtags']);
 656         elseif (!empty($_GET['searchterm'])) $searchcrits.='&searchterm='.urlencode($_GET['searchterm']);
 657         $this->tpl->assign('searchcrits',$searchcrits);
 658         $this->tpl->assign('source',indexUrl());
 659         $this->tpl->assign('version',shaarli_version);
 660         $this->tpl->assign('scripturl',indexUrl());
 661         $this->tpl->assign('pagetitle','Shaarli');
 662         $this->tpl->assign('privateonly',!empty($_SESSION['privateonly'])); // Show only private links?
 663         if (!empty($GLOBALS['title'])) $this->tpl->assign('pagetitle',$GLOBALS['title']);
 664         if (!empty($GLOBALS['titleLink'])) $this->tpl->assign('titleLink',$GLOBALS['titleLink']);
 665         if (!empty($GLOBALS['pagetitle'])) $this->tpl->assign('pagetitle',$GLOBALS['pagetitle']);
 666         $this->tpl->assign('shaarlititle',empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title'] );
 667         return;
 668     }
 669
 670     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 671     public function assign($what,$where)
 672     {
 673         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 674         $this->tpl->assign($what,$where);
 675     }
 676
 677     // Render a specific page (using a template).
 678     // e.g. pb.renderPage('picwall')
 679     public function renderPage($page)
 680     {
 681         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 682         $this->tpl->draw($page);
 683     }
 684 }
 685
 686 // ------------------------------------------------------------------------------------------
 687 // Output the last N links in RSS 2.0 format.
 688 function showRSS()
 689 {
 690     header('Content-Type: application/rss+xml; charset=utf-8');
 691
 692     // $usepermalink : If true, use permalink instead of final link.
 693     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=rss&permalinks
 694     // Also enabled through a config option
 695     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 696
 697     // Cache system
 698     $query = $_SERVER["QUERY_STRING"];
 699     $cache = new pageCache(pageUrl(),startsWith($query,'do=rss') && !isLoggedIn());
 700     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
 701
 702     // If cached was not found (or not usable), then read the database and build the response:
 703     $LINKSDB = new LinkDB(
 704         $GLOBALS['config']['DATASTORE'],
 705         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 706         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 707     );
 708     // Read links from database (and filter private links if user it not logged in).
 709
 710     // Optionally filter the results:
 711     $linksToDisplay=array();
 712     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 713     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 714     else $linksToDisplay = $LINKSDB;
 715
 716     $nblinksToDisplay = 50;  // Number of links to display.
 717     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 718     {
 719         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 720     }
 721
 722     $pageaddr=escape(indexUrl());
 723     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 724     echo '<channel><title>'.$GLOBALS['title'].'</title><link>'.$pageaddr.'</link>';
 725     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 726     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 727     {
 728         echo '<!-- PubSubHubbub Discovery -->';
 729         echo '<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 730         echo '<link rel="self" href="'.$pageaddr.'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 731         echo '<!-- End Of PubSubHubbub Discovery -->';
 732     }
 733     $i=0;
 734     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 735     while ($i<$nblinksToDisplay && $i<count($keys))
 736     {
 737         $link = $linksToDisplay[$keys[$i]];
 738         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 739         $rfc822date = linkdate2rfc822($link['linkdate']);
 740         $absurl = $link['url'];
 741         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 742         if ($usepermalinks===true)
 743             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 744         else
 745             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 746         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.escape($rfc822date)."</pubDate>\n";
 747         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 748         {
 749             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.$pageaddr.'">'.$tag.'</category>'."\n"; }
 750         }
 751
 752         // Add permalink in description
 753         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 754         // If user wants permalinks first, put the final link in description
 755         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 756         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 757         echo '<description><![CDATA['.nl2br(keepMultipleSpaces(text2clickable($link['description']))).$descriptionlink.']]></description>'."\n</item>\n";
 758         $i++;
 759     }
 760     echo '</channel></rss><!-- Cached version of '.escape(pageUrl()).' -->';
 761
 762     $cache->cache(ob_get_contents());
 763     ob_end_flush();
 764     exit;
 765 }
 766
 767 // ------------------------------------------------------------------------------------------
 768 // Output the last N links in ATOM format.
 769 function showATOM()
 770 {
 771     header('Content-Type: application/atom+xml; charset=utf-8');
 772
 773     // $usepermalink : If true, use permalink instead of final link.
 774     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
 775     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 776
 777     // Cache system
 778     $query = $_SERVER["QUERY_STRING"];
 779     $cache = new pageCache(pageUrl(),startsWith($query,'do=atom') && !isLoggedIn());
 780     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
 781     // If cached was not found (or not usable), then read the database and build the response:
 782
 783 // Read links from database (and filter private links if used it not logged in).
 784     $LINKSDB = new LinkDB(
 785         $GLOBALS['config']['DATASTORE'],
 786         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 787         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 788     );
 789
 790     // Optionally filter the results:
 791     $linksToDisplay=array();
 792     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 793     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 794     else $linksToDisplay = $LINKSDB;
 795
 796     $nblinksToDisplay = 50;  // Number of links to display.
 797     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 798     {
 799         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 800     }
 801
 802     $pageaddr=escape(indexUrl());
 803     $latestDate = '';
 804     $entries='';
 805     $i=0;
 806     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 807     while ($i<$nblinksToDisplay && $i<count($keys))
 808     {
 809         $link = $linksToDisplay[$keys[$i]];
 810         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 811         $iso8601date = linkdate2iso8601($link['linkdate']);
 812         $latestDate = max($latestDate,$iso8601date);
 813         $absurl = $link['url'];
 814         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 815         $entries.='<entry><title>'.$link['title'].'</title>';
 816         if ($usepermalinks===true)
 817             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
 818         else
 819             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
 820         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.escape($iso8601date).'</updated>';
 821
 822         // Add permalink in description
 823         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 824         // If user wants permalinks first, put the final link in description
 825         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 826         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 827
 828         $entries.='<content type="html"><![CDATA['.nl2br(keepMultipleSpaces(text2clickable($link['description']))).$descriptionlink."]]></content>\n";
 829         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
 830         {
 831             foreach(explode(' ',$link['tags']) as $tag)
 832                 { $entries.='<category scheme="'.$pageaddr.'" term="'.$tag.'" />'."\n"; }
 833         }
 834         $entries.="</entry>\n";
 835         $i++;
 836     }
 837     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
 838     $feed.='<title>'.$GLOBALS['title'].'</title>';
 839     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.escape($latestDate).'</updated>';
 840     $feed.='<link rel="self" href="'.escape(serverUrl().$_SERVER["REQUEST_URI"]).'" />';
 841     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 842     {
 843         $feed.='<!-- PubSubHubbub Discovery -->';
 844         $feed.='<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
 845         $feed.='<!-- End Of PubSubHubbub Discovery -->';
 846     }
 847     $feed.='<author><name>'.$pageaddr.'</name><uri>'.$pageaddr.'</uri></author>';
 848     $feed.='<id>'.$pageaddr.'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
 849     $feed.=$entries;
 850     $feed.='</feed><!-- Cached version of '.escape(pageUrl()).' -->';
 851     echo $feed;
 852
 853     $cache->cache(ob_get_contents());
 854     ob_end_flush();
 855     exit;
 856 }
 857
 858 // ------------------------------------------------------------------------------------------
 859 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 860 // Gives the last 7 days (which have links).
 861 // This RSS feed cannot be filtered.
 862 function showDailyRSS() {
 863     // Cache system
 864     $query = $_SERVER["QUERY_STRING"];
 865     $cache = new pageCache(pageUrl(), startsWith($query, 'do=dailyrss') && !isLoggedIn());
 866     $cached = $cache->cachedVersion();
 867     if (!empty($cached)) {
 868         echo $cached;
 869         exit;
 870     }
 871
 872     // If cached was not found (or not usable), then read the database and build the response:
 873     // Read links from database (and filter private links if used it not logged in).
 874     $LINKSDB = new LinkDB(
 875         $GLOBALS['config']['DATASTORE'],
 876         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 877         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 878     );
 879
 880     /* Some Shaarlies may have very few links, so we need to look
 881        back in time (rsort()) until we have enough days ($nb_of_days).
 882     */
 883     $linkdates = array();
 884     foreach ($LINKSDB as $linkdate => $value) {
 885         $linkdates[] = $linkdate;
 886     }
 887     rsort($linkdates);
 888     $nb_of_days = 7; // We take 7 days.
 889     $today = Date('Ymd');
 890     $days = array();
 891
 892     foreach ($linkdates as $linkdate) {
 893         $day = substr($linkdate, 0, 8); // Extract day (without time)
 894         if (strcmp($day,$today) < 0) {
 895             if (empty($days[$day])) {
 896                 $days[$day] = array();
 897             }
 898             $days[$day][] = $linkdate;
 899         }
 900
 901         if (count($days) > $nb_of_days) {
 902             break; // Have we collected enough days?
 903         }
 904     }
 905
 906     // Build the RSS feed.
 907     header('Content-Type: application/rss+xml; charset=utf-8');
 908     $pageaddr = escape(indexUrl());
 909     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 910     echo '<channel>';
 911     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 912     echo '<link>'. $pageaddr .'</link>';
 913     echo '<description>Daily shared links</description>';
 914     echo '<language>en-en</language>';
 915     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 916
 917     // For each day.
 918     foreach ($days as $day => $linkdates) {
 919         $daydate = linkdate2timestamp($day.'_000000'); // Full text date
 920         $rfc822date = linkdate2rfc822($day.'_000000');
 921         $absurl = escape(indexUrl().'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 922
 923         // Build the HTML body of this RSS entry.
 924         $html = '';
 925         $href = '';
 926         $links = array();
 927
 928         // We pre-format some fields for proper output.
 929         foreach ($linkdates as $linkdate) {
 930             $l = $LINKSDB[$linkdate];
 931             $l['formatedDescription'] = nl2br(keepMultipleSpaces(text2clickable($l['description'])));
 932             $l['thumbnail'] = thumbnail($l['url']);
 933             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
 934             if (startsWith($l['url'], '?')) {
 935                 $l['url'] = indexUrl() . $l['url'];  // make permalink URL absolute
 936             }
 937             $links[$linkdate] = $l;
 938         }
 939
 940         // Then build the HTML for this day:
 941         $tpl = new RainTPL;
 942         $tpl->assign('title', $GLOBALS['title']);
 943         $tpl->assign('daydate', $daydate);
 944         $tpl->assign('absurl', $absurl);
 945         $tpl->assign('links', $links);
 946         $tpl->assign('rfc822date', escape($rfc822date));
 947         $html = $tpl->draw('dailyrss', $return_string=true);
 948
 949         echo $html . PHP_EOL;
 950     }
 951     echo '</channel></rss><!-- Cached version of '. escape(pageUrl()) .' -->';
 952
 953     $cache->cache(ob_get_contents());
 954     ob_end_flush();
 955     exit;
 956 }
 957
 958 // "Daily" page.
 959 function showDaily()
 960 {
 961     $LINKSDB = new LinkDB(
 962         $GLOBALS['config']['DATASTORE'],
 963         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 964         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 965     );
 966
 967     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 968     if (isset($_GET['day'])) $day=$_GET['day'];
 969
 970     $days = $LINKSDB->days();
 971     $i = array_search($day,$days);
 972     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
 973     $previousday='';
 974     $nextday='';
 975     if ($i!==false)
 976     {
 977         if ($i>=1) $previousday=$days[$i-1];
 978         if ($i<count($days)-1) $nextday=$days[$i+1];
 979     }
 980
 981     try {
 982         $linksToDisplay = $LINKSDB->filterDay($day);
 983     } catch (Exception $exc) {
 984         error_log($exc);
 985         $linksToDisplay = [];
 986     }
 987
 988     // We pre-format some fields for proper output.
 989     foreach($linksToDisplay as $key=>$link)
 990     {
 991
 992         $taglist = explode(' ',$link['tags']);
 993         uasort($taglist, 'strcasecmp');
 994         $linksToDisplay[$key]['taglist']=$taglist;
 995         $linksToDisplay[$key]['formatedDescription']=nl2br(keepMultipleSpaces(text2clickable($link['description'])));
 996         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
 997         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
 998     }
 999
1000     /* We need to spread the articles on 3 columns.
1001        I did not want to use a JavaScript lib like http://masonry.desandro.com/
1002        so I manually spread entries with a simple method: I roughly evaluate the
1003        height of a div according to title and description length.
1004     */
1005     $columns=array(array(),array(),array()); // Entries to display, for each column.
1006     $fill=array(0,0,0);  // Rough estimate of columns fill.
1007     foreach($linksToDisplay as $key=>$link)
1008     {
1009         // Roughly estimate length of entry (by counting characters)
1010         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
1011         // Description: 836 characters gives roughly 342 pixel height.
1012         // This is not perfect, but it's usually OK.
1013         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
1014         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
1015         // Then put in column which is the less filled:
1016         $smallest=min($fill); // find smallest value in array.
1017         $index=array_search($smallest,$fill); // find index of this smallest value.
1018         array_push($columns[$index],$link); // Put entry in this column.
1019         $fill[$index]+=$length;
1020     }
1021     $PAGE = new pageBuilder;
1022     $PAGE->assign('linksToDisplay',$linksToDisplay);
1023     $PAGE->assign('linkcount',count($LINKSDB));
1024     $PAGE->assign('cols', $columns);
1025     $PAGE->assign('day',linkdate2timestamp($day.'_000000'));
1026     $PAGE->assign('previousday',$previousday);
1027     $PAGE->assign('nextday',$nextday);
1028     $PAGE->renderPage('daily');
1029     exit;
1030 }
1031
1032
1033 // ------------------------------------------------------------------------------------------
1034 // Render HTML page (according to URL parameters and user rights)
1035 function renderPage()
1036 {
1037     $LINKSDB = new LinkDB(
1038         $GLOBALS['config']['DATASTORE'],
1039         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
1040         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
1041     );
1042
1043     // -------- Display login form.
1044     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=login'))
1045     {
1046         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1047         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1048         $PAGE = new pageBuilder;
1049         $PAGE->assign('token',$token);
1050         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
1051         $PAGE->renderPage('loginform');
1052         exit;
1053     }
1054     // -------- User wants to logout.
1055     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1056     {
1057         invalidateCaches();
1058         logout();
1059         header('Location: ?');
1060         exit;
1061     }
1062
1063     // -------- Picture wall
1064     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=picwall'))
1065     {
1066         // Optionally filter the results:
1067         $links=array();
1068         if (!empty($_GET['searchterm'])) $links = $LINKSDB->filterFulltext($_GET['searchterm']);
1069         elseif (!empty($_GET['searchtags']))   $links = $LINKSDB->filterTags(trim($_GET['searchtags']));
1070         else $links = $LINKSDB;
1071
1072         $body='';
1073         $linksToDisplay=array();
1074
1075         // Get only links which have a thumbnail.
1076         foreach($links as $link)
1077         {
1078             $permalink='?'.escape(smallhash($link['linkdate']));
1079             $thumb=lazyThumbnail($link['url'],$permalink);
1080             if ($thumb!='') // Only output links which have a thumbnail.
1081             {
1082                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1083                 $linksToDisplay[]=$link; // Add to array.
1084             }
1085         }
1086
1087         $PAGE = new pageBuilder;
1088         $PAGE->assign('linkcount',count($LINKSDB));
1089         $PAGE->assign('linksToDisplay',$linksToDisplay);
1090         $PAGE->renderPage('picwall');
1091         exit;
1092     }
1093
1094     // -------- Tag cloud
1095     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tagcloud'))
1096     {
1097         $tags= $LINKSDB->allTags();
1098
1099         // We sort tags alphabetically, then choose a font size according to count.
1100         // First, find max value.
1101         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1102         ksort($tags);
1103         $tagList=array();
1104         foreach($tags as $key=>$value)
1105         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1106         {
1107             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1108         }
1109         $PAGE = new pageBuilder;
1110         $PAGE->assign('linkcount',count($LINKSDB));
1111         $PAGE->assign('tags',$tagList);
1112         $PAGE->renderPage('tagcloud');
1113         exit;
1114     }
1115
1116     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1117     if (isset($_GET['addtag']))
1118     {
1119         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1120         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1121         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1122
1123         // Check if this tag is already in the search query and ignore it if it is.
1124         // Each tag is always separated by a space
1125         $current_tags = explode(' ', $params['searchtags']);
1126         $addtag = true;
1127         foreach ($current_tags as $value) {
1128             if ($value === $_GET['addtag']) {
1129                 $addtag = false;
1130                 break;
1131             }
1132         }
1133         // Append the tag if necessary
1134         if (empty($params['searchtags'])) {
1135             $params['searchtags'] = trim($_GET['addtag']);
1136         }
1137         else if ($addtag) {
1138             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1139         }
1140
1141         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1142         header('Location: ?'.http_build_query($params));
1143         exit;
1144     }
1145
1146     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1147     if (isset($_GET['removetag']))
1148     {
1149         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1150         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?'); exit; } // In case browser does not send HTTP_REFERER
1151         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1152         if (isset($params['searchtags']))
1153         {
1154             $tags = explode(' ',$params['searchtags']);
1155             $tags=array_diff($tags, array($_GET['removetag'])); // Remove value from array $tags.
1156             if (count($tags)==0) unset($params['searchtags']); else $params['searchtags'] = implode(' ',$tags);
1157             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1158         }
1159         header('Location: ?'.http_build_query($params));
1160         exit;
1161     }
1162
1163     // -------- User wants to change the number of links per page (linksperpage=...)
1164     if (isset($_GET['linksperpage']))
1165     {
1166         if (is_numeric($_GET['linksperpage'])) { $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage'])); }
1167         // Make sure the referrer is Shaarli itself.
1168         $referer = '?';
1169         if (!empty($_SERVER['HTTP_REFERER']) && strcmp(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST),$_SERVER['HTTP_HOST'])==0)
1170             $referer = $_SERVER['HTTP_REFERER'];
1171         header('Location: '.$referer);
1172         exit;
1173     }
1174
1175     // -------- User wants to see only private links (toggle)
1176     if (isset($_GET['privateonly']))
1177     {
1178         if (empty($_SESSION['privateonly']))
1179         {
1180             $_SESSION['privateonly']=1; // See only private links
1181         }
1182         else
1183         {
1184             unset($_SESSION['privateonly']); // See all links
1185         }
1186         // Make sure the referrer is Shaarli itself.
1187         $referer = '?';
1188         if (!empty($_SERVER['HTTP_REFERER']) && strcmp(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST),$_SERVER['HTTP_HOST'])==0)
1189             $referer = $_SERVER['HTTP_REFERER'];
1190         header('Location: '.$referer);
1191         exit;
1192     }
1193
1194     // -------- Handle other actions allowed for non-logged in users:
1195     if (!isLoggedIn())
1196     {
1197         // User tries to post new link but is not logged in:
1198         // Show login screen, then redirect to ?post=...
1199         if (isset($_GET['post']))
1200         {
1201             header('Location: ?do=login&post='.urlencode($_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.
1202             exit;
1203         }
1204
1205                 // Same case as above except that user tried to access ?do=addlink without being logged in
1206                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1207                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1208                         header('Location: ?do=login&post=');
1209                         exit;
1210                 }
1211
1212         $PAGE = new pageBuilder;
1213         buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1214         $PAGE->renderPage('linklist');
1215         exit; // Never remove this one! All operations below are reserved for logged in user.
1216     }
1217
1218     // -------- All other functions are reserved for the registered user:
1219
1220     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1221     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tools'))
1222     {
1223         $PAGE = new pageBuilder;
1224         $PAGE->assign('linkcount',count($LINKSDB));
1225         $PAGE->assign('pageabsaddr',indexUrl());
1226         $PAGE->renderPage('tools');
1227         exit;
1228     }
1229
1230     // -------- User wants to change his/her password.
1231     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changepasswd'))
1232     {
1233         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1234         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1235         {
1236             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1237
1238             // Make sure old password is correct.
1239             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1240             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1241             // Save new password
1242             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1243             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1244             try {
1245                 writeConfig($GLOBALS, isLoggedIn());
1246             }
1247             catch(Exception $e) {
1248                 error_log(
1249                     'ERROR while writing config file after changing password.' . PHP_EOL .
1250                     $e->getMessage()
1251                 );
1252
1253                 // TODO: do not handle exceptions/errors in JS.
1254                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1255                 exit;
1256             }
1257             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1258             exit;
1259         }
1260         else // show the change password form.
1261         {
1262             $PAGE = new pageBuilder;
1263             $PAGE->assign('linkcount',count($LINKSDB));
1264             $PAGE->assign('token',getToken());
1265             $PAGE->renderPage('changepassword');
1266             exit;
1267         }
1268     }
1269
1270     // -------- User wants to change configuration
1271     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=configure'))
1272     {
1273         if (!empty($_POST['title']) )
1274         {
1275             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1276             $tz = 'UTC';
1277             if (!empty($_POST['continent']) && !empty($_POST['city']))
1278                 if (isTZvalid($_POST['continent'],$_POST['city']))
1279                     $tz = $_POST['continent'].'/'.$_POST['city'];
1280             $GLOBALS['timezone'] = $tz;
1281             $GLOBALS['title']=$_POST['title'];
1282             $GLOBALS['titleLink']=$_POST['titleLink'];
1283             $GLOBALS['redirector']=$_POST['redirector'];
1284             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1285             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1286             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1287             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1288             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1289             try {
1290                 writeConfig($GLOBALS, isLoggedIn());
1291             }
1292             catch(Exception $e) {
1293                 error_log(
1294                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1295                     $e->getMessage()
1296                 );
1297
1298                 // TODO: do not handle exceptions/errors in JS.
1299                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1300                 exit;
1301             }
1302             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1303             exit;
1304         }
1305         else // Show the configuration form.
1306         {
1307             $PAGE = new pageBuilder;
1308             $PAGE->assign('linkcount',count($LINKSDB));
1309             $PAGE->assign('token',getToken());
1310             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1311             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1312             list($timezone_form,$timezone_js) = templateTZform($GLOBALS['timezone']);
1313             $PAGE->assign('timezone_form',$timezone_form); // FIXME: Put entire tz form generation in template?
1314             $PAGE->assign('timezone_js',$timezone_js);
1315             $PAGE->renderPage('configure');
1316             exit;
1317         }
1318     }
1319
1320     // -------- User wants to rename a tag or delete it
1321     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changetag'))
1322     {
1323         if (empty($_POST['fromtag']))
1324         {
1325             $PAGE = new pageBuilder;
1326             $PAGE->assign('linkcount',count($LINKSDB));
1327             $PAGE->assign('token',getToken());
1328             $PAGE->assign('tags', $LINKSDB->allTags());
1329             $PAGE->renderPage('changetag');
1330             exit;
1331         }
1332         if (!tokenOk($_POST['token'])) die('Wrong token.');
1333
1334         // Delete a tag:
1335         if (!empty($_POST['deletetag']) && !empty($_POST['fromtag']))
1336         {
1337             $needle=trim($_POST['fromtag']);
1338             $linksToAlter = $LINKSDB->filterTags($needle,true); // True for case-sensitive tag search.
1339             foreach($linksToAlter as $key=>$value)
1340             {
1341                 $tags = explode(' ',trim($value['tags']));
1342                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1343                 $value['tags']=trim(implode(' ',$tags));
1344                 $LINKSDB[$key]=$value;
1345             }
1346             $LINKSDB->savedb(); // Save to disk.
1347             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1348             exit;
1349         }
1350
1351         // Rename a tag:
1352         if (!empty($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag']))
1353         {
1354             $needle=trim($_POST['fromtag']);
1355             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
1356             foreach($linksToAlter as $key=>$value)
1357             {
1358                 $tags = explode(' ',trim($value['tags']));
1359                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1360                 $value['tags']=trim(implode(' ',$tags));
1361                 $LINKSDB[$key]=$value;
1362             }
1363             $LINKSDB->savedb(); // Save to disk.
1364             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1365             exit;
1366         }
1367     }
1368
1369     // -------- User wants to add a link without using the bookmarklet: Show form.
1370     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=addlink'))
1371     {
1372         $PAGE = new pageBuilder;
1373         $PAGE->assign('linkcount',count($LINKSDB));
1374         $PAGE->renderPage('addlink');
1375         exit;
1376     }
1377
1378     // -------- User clicked the "Save" button when editing a link: Save link to database.
1379     if (isset($_POST['save_edit']))
1380     {
1381         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1382         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1383         $tags = implode(' ', array_unique(explode(' ', $tags))); // Remove duplicates.
1384         $linkdate=$_POST['lf_linkdate'];
1385         $url = trim($_POST['lf_url']);
1386         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?') && !startsWith($url,'javascript:'))
1387             $url = 'http://'.$url;
1388         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1389                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1390         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1391         $LINKSDB[$linkdate] = $link;
1392         $LINKSDB->savedb(); // Save to disk.
1393         pubsubhub();
1394
1395         // If we are called from the bookmarklet, we must close the popup:
1396         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1397         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1398         $returnurl .= '#'.smallHash($linkdate);  // Scroll to the link which has been edited.
1399         if (strstr($returnurl, "do=addlink")) { $returnurl = '?'; } //if we come from ?do=addlink, set returnurl to homepage instead
1400         header('Location: '.$returnurl); // After saving the link, redirect to the page the user was on.
1401         exit;
1402     }
1403
1404     // -------- User clicked the "Cancel" button when editing a link.
1405     if (isset($_POST['cancel_edit']))
1406     {
1407         // If we are called from the bookmarklet, we must close the popup:
1408         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1409         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1410         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1411         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1412         exit;
1413     }
1414
1415     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1416     if (isset($_POST['delete_link']))
1417     {
1418         if (!tokenOk($_POST['token'])) die('Wrong token.');
1419         // We do not need to ask for confirmation:
1420         // - confirmation is handled by JavaScript
1421         // - we are protected from XSRF by the token.
1422         $linkdate=$_POST['lf_linkdate'];
1423         unset($LINKSDB[$linkdate]);
1424         $LINKSDB->savedb(); // save to disk
1425
1426         // If we are called from the bookmarklet, we must close the popup:
1427         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1428         // Pick where we're going to redirect
1429         // =============================================================
1430         // Basically, we can't redirect to where we were previously if it was a permalink
1431         // or an edit_link, because it would 404.
1432         // Cases:
1433         //    - /             : nothing in $_GET, redirect to self
1434         //    - /?page        : redirect to self
1435         //    - /?searchterm  : redirect to self (there might be other links)
1436         //    - /?searchtags  : redirect to self
1437         //    - /permalink    : redirect to / (the link does not exist anymore)
1438         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1439         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1440         // redirect is not satisfied, and only then redirect to /
1441         $location = "?";
1442         // Self redirection
1443         if (count($_GET) == 0    ||
1444             isset($_GET['page']) ||
1445             isset($_GET['searchterm']) ||
1446             isset($_GET['searchtags'])) {
1447
1448             if (isset($_POST['returnurl'])) {
1449                 $location = $_POST['returnurl']; // Handle redirects given by the form
1450             }
1451
1452             if ($location === "?" &&
1453                 isset($_SERVER['HTTP_REFERER'])) { // Handle HTTP_REFERER in case we're not coming from the same place.
1454                 $location = $_SERVER['HTTP_REFERER'];
1455             }
1456         }
1457
1458         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1459         exit;
1460     }
1461
1462     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1463     if (isset($_GET['edit_link']))
1464     {
1465         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1466         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1467         $PAGE = new pageBuilder;
1468         $PAGE->assign('linkcount',count($LINKSDB));
1469         $PAGE->assign('link',$link);
1470         $PAGE->assign('link_is_new',false);
1471         $PAGE->assign('token',getToken()); // XSRF protection.
1472         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''));
1473         $PAGE->assign('tags', $LINKSDB->allTags());
1474         $PAGE->renderPage('editlink');
1475         exit;
1476     }
1477
1478     // -------- User want to post a new link: Display link edit form.
1479     if (isset($_GET['post']))
1480     {
1481         $url=$_GET['post'];
1482
1483
1484         // We remove the annoying parameters added by FeedBurner, GoogleFeedProxy, Facebook...
1485         $annoyingpatterns = array('/[\?&]utm_source=[^&]*/',
1486             '/[\?&]utm_campaign=[^&]*/',
1487             '/[\?&]utm_medium=[^&]*/',
1488             '/#xtor=RSS-[^&]*/',
1489             '/[\?&]fb_[^&]*/',
1490             '/[\?&]__scoop[^&]*/',
1491             '/#tk\.rss_all\?/',
1492             '/[\?&]action_ref_map=[^&]*/',
1493             '/[\?&]action_type_map=[^&]*/',
1494             '/[\?&]action_object_map=[^&]*/',
1495             '/[\?&]utm_content=[^&]*/',
1496             '/[\?&]fb=[^&]*/',
1497             '/[\?&]xtor=[^&]*/'
1498             );
1499         foreach($annoyingpatterns as $pattern)
1500         {
1501             $url = preg_replace($pattern, "", $url);
1502         }
1503
1504         $link_is_new = false;
1505         $link = $LINKSDB->getLinkFromUrl($url); // Check if URL is not already in database (in this case, we will edit the existing link)
1506         if (!$link)
1507         {
1508             $link_is_new = true;  // This is a new link
1509             $linkdate = strval(date('Ymd_His'));
1510             $title = (empty($_GET['title']) ? '' : $_GET['title'] ); // Get title if it was provided in URL (by the bookmarklet).
1511             $description = (empty($_GET['description']) ? '' : $_GET['description']); // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1512             $tags = (empty($_GET['tags']) ? '' : $_GET['tags'] ); // Get tags if it was provided in URL
1513             $private = (!empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0); // Get private if it was provided in URL
1514             if (($url!='') && parse_url($url,PHP_URL_SCHEME)=='') $url = 'http://'.$url;
1515             // 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.)
1516             if (empty($title) && parse_url($url,PHP_URL_SCHEME)=='http')
1517             {
1518                 list($status,$headers,$data) = getHTTP($url,4); // Short timeout to keep the application responsive.
1519                 // FIXME: Decode charset according to specified in either 1) HTTP response headers or 2) <head> in html
1520                 if (strpos($status,'200 OK')!==false)
1521                                          {
1522                         // Look for charset in html header.
1523                                                 preg_match('#<meta .*charset=.*>#Usi', $data, $meta);
1524
1525                                                 // If found, extract encoding.
1526                                                 if (!empty($meta[0]))
1527                                                 {
1528                                                         // Get encoding specified in header.
1529                                                         preg_match('#charset="?(.*)"#si', $meta[0], $enc);
1530                                                         // If charset not found, use utf-8.
1531                                                         $html_charset = (!empty($enc[1])) ? strtolower($enc[1]) : 'utf-8';
1532                                                 }
1533                                                 else { $html_charset = 'utf-8'; }
1534
1535                                                 // Extract title
1536                                                 $title = html_extract_title($data);
1537                                                 if (!empty($title))
1538                                                 {
1539                                                         // Re-encode title in utf-8 if necessary.
1540                                                         $title = ($html_charset == 'iso-8859-1') ? utf8_encode($title) : $title;
1541                                                 }
1542                                         }
1543             }
1544             if ($url=='') // In case of empty URL, this is just a text (with a link that points to itself)
1545             {
1546                 $url='?'.smallHash($linkdate);
1547                 $title='Note: ';
1548             }
1549             $link = array('linkdate'=>$linkdate,'title'=>$title,'url'=>$url,'description'=>$description,'tags'=>$tags,'private'=>$private);
1550         }
1551
1552         $PAGE = new pageBuilder;
1553         $PAGE->assign('linkcount',count($LINKSDB));
1554         $PAGE->assign('link',$link);
1555         $PAGE->assign('link_is_new',$link_is_new);
1556         $PAGE->assign('token',getToken()); // XSRF protection.
1557         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : ''));
1558         $PAGE->assign('source',(isset($_GET['source']) ? $_GET['source'] : ''));
1559         $PAGE->assign('tags', $LINKSDB->allTags());
1560         $PAGE->renderPage('editlink');
1561         exit;
1562     }
1563
1564     // -------- Export as Netscape Bookmarks HTML file.
1565     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=export'))
1566     {
1567         if (empty($_GET['what']))
1568         {
1569             $PAGE = new pageBuilder;
1570             $PAGE->assign('linkcount',count($LINKSDB));
1571             $PAGE->renderPage('export');
1572             exit;
1573         }
1574         $exportWhat=$_GET['what'];
1575         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1576
1577         header('Content-Type: text/html; charset=utf-8');
1578         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1579         $currentdate=date('Y/m/d H:i:s');
1580         echo <<<HTML
1581 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1582 <!-- This is an automatically generated file.
1583      It will be read and overwritten.
1584      DO NOT EDIT! -->
1585 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1586 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1587 <TITLE>Bookmarks</TITLE>
1588 <H1>Bookmarks</H1>
1589 HTML;
1590         foreach($LINKSDB as $link)
1591         {
1592             if ($exportWhat=='all' ||
1593                ($exportWhat=='private' && $link['private']!=0) ||
1594                ($exportWhat=='public' && $link['private']==0))
1595             {
1596                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1597                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1598                 echo '>'.$link['title']."</A>\n";
1599                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1600             }
1601         }
1602                 exit;
1603     }
1604
1605     // -------- User is uploading a file for import
1606     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1607     {
1608         // If file is too big, some form field may be missing.
1609         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1610         {
1611             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1612             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1613             exit;
1614         }
1615         if (!tokenOk($_POST['token'])) die('Wrong token.');
1616         importFile();
1617         exit;
1618     }
1619
1620     // -------- Show upload/import dialog:
1621     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=import'))
1622     {
1623         $PAGE = new pageBuilder;
1624         $PAGE->assign('linkcount',count($LINKSDB));
1625         $PAGE->assign('token',getToken());
1626         $PAGE->assign('maxfilesize',getMaxFileSize());
1627         $PAGE->renderPage('import');
1628         exit;
1629     }
1630
1631     // -------- Otherwise, simply display search form and links:
1632     $PAGE = new pageBuilder;
1633     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1634     $PAGE->renderPage('linklist');
1635     exit;
1636 }
1637
1638 // -----------------------------------------------------------------------------------------------
1639 // Process the import file form.
1640 function importFile()
1641 {
1642     if (!(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'])) { die('Not allowed.'); }
1643     $LINKSDB = new LinkDB(
1644         $GLOBALS['config']['DATASTORE'],
1645         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
1646         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
1647     );
1648     $filename=$_FILES['filetoupload']['name'];
1649     $filesize=$_FILES['filetoupload']['size'];
1650     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1651     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1652     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1653     $import_count=0;
1654
1655     // Sniff file type:
1656     $type='unknown';
1657     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1658
1659     // Then import the bookmarks.
1660     if ($type=='netscape')
1661     {
1662         // This is a standard Netscape-style bookmark file.
1663         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1664         foreach(explode('<DT>',$data) as $html) // explode is very fast
1665         {
1666             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1667             $d = explode('<DD>',$html);
1668             if (startswith($d[0],'<A '))
1669             {
1670                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1671                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1672                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1673                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1674                 $raw_add_date=0;
1675                 foreach($matches as $m)
1676                 {
1677                     $attr=$m[1]; $value=$m[2];
1678                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1679                     elseif ($attr=='ADD_DATE')
1680                     {
1681                         $raw_add_date=intval($value);
1682                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1683                     }
1684                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1685                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1686                 }
1687                 if ($link['url']!='')
1688                 {
1689                     if ($private==1) $link['private']=1;
1690                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1691                     if ($dblink==false)
1692                     {  // Link not in database, let's import it...
1693                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1694
1695                        // Make sure date/time is not already used by another link.
1696                        // (Some bookmark files have several different links with the same ADD_DATE)
1697                        // We increment date by 1 second until we find a date which is not used in DB.
1698                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1699                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1700                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1701                        $LINKSDB[$link['linkdate']] = $link;
1702                        $import_count++;
1703                     }
1704                     else // Link already present in database.
1705                     {
1706                         if ($overwrite)
1707                         {   // If overwrite is required, we import link data, except date/time.
1708                             $link['linkdate']=$dblink['linkdate'];
1709                             $LINKSDB[$link['linkdate']] = $link;
1710                             $import_count++;
1711                         }
1712                     }
1713
1714                 }
1715             }
1716         }
1717         $LINKSDB->savedb();
1718
1719         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1720     }
1721     else
1722     {
1723         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1724     }
1725 }
1726
1727 // -----------------------------------------------------------------------------------------------
1728 // Template for the list of links (<div id="linklist">)
1729 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1730 function buildLinkList($PAGE,$LINKSDB)
1731 {
1732     // ---- Filter link database according to parameters
1733     $linksToDisplay=array();
1734     $search_type='';
1735     $search_crits='';
1736     if (isset($_GET['searchterm'])) // Fulltext search
1737     {
1738         $linksToDisplay = $LINKSDB->filterFulltext(trim($_GET['searchterm']));
1739         $search_crits=escape(trim($_GET['searchterm']));
1740         $search_type='fulltext';
1741     }
1742     elseif (isset($_GET['searchtags'])) // Search by tag
1743     {
1744         $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
1745         $search_crits=explode(' ',escape(trim($_GET['searchtags'])));
1746         $search_type='tags';
1747     }
1748     elseif (isset($_SERVER['QUERY_STRING']) && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/',$_SERVER['QUERY_STRING'])) // Detect smallHashes in URL
1749     {
1750         $linksToDisplay = $LINKSDB->filterSmallHash(substr(trim($_SERVER["QUERY_STRING"], '/'),0,6));
1751         if (count($linksToDisplay)==0)
1752         {
1753             header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
1754             echo '<h1>404 Not found.</h1>Oh crap. The link you are trying to reach does not exist or has been deleted.';
1755             echo '<br>You would mind <a href="?">clicking here</a>?';
1756             exit;
1757         }
1758         $search_type='permalink';
1759     }
1760     else
1761         $linksToDisplay = $LINKSDB;  // Otherwise, display without filtering.
1762
1763
1764     // Option: Show only private links
1765     if (!empty($_SESSION['privateonly']))
1766     {
1767         $tmp = array();
1768         foreach($linksToDisplay as $linkdate=>$link)
1769         {
1770             if ($link['private']!=0) $tmp[$linkdate]=$link;
1771         }
1772         $linksToDisplay=$tmp;
1773     }
1774
1775     // ---- Handle paging.
1776     /* Can someone explain to me why you get the following error when using array_keys() on an object which implements the interface ArrayAccess???
1777        "Warning: array_keys() expects parameter 1 to be array, object given in ... "
1778        If my class implements ArrayAccess, why won't array_keys() accept it ?  ( $keys=array_keys($linksToDisplay); )
1779     */
1780     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; } // Stupid and ugly. Thanks PHP.
1781
1782     // If there is only a single link, we change on-the-fly the title of the page.
1783     if (count($linksToDisplay)==1) $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1784
1785     // Select articles according to paging.
1786     $pagecount = ceil(count($keys)/$_SESSION['LINKS_PER_PAGE']);
1787     $pagecount = ($pagecount==0 ? 1 : $pagecount);
1788     $page=( empty($_GET['page']) ? 1 : intval($_GET['page']));
1789     $page = ( $page<1 ? 1 : $page );
1790     $page = ( $page>$pagecount ? $pagecount : $page );
1791     $i = ($page-1)*$_SESSION['LINKS_PER_PAGE']; // Start index.
1792     $end = $i+$_SESSION['LINKS_PER_PAGE'];
1793     $linkDisp=array(); // Links to display
1794     while ($i<$end && $i<count($keys))
1795     {
1796         $link = $linksToDisplay[$keys[$i]];
1797         $link['description']=nl2br(keepMultipleSpaces(text2clickable($link['description'])));
1798         $title=$link['title'];
1799         $classLi =  $i%2!=0 ? '' : 'publicLinkHightLight';
1800         $link['class'] = ($link['private']==0 ? $classLi : 'private');
1801         $link['timestamp']=linkdate2timestamp($link['linkdate']);
1802         $taglist = explode(' ',$link['tags']);
1803         uasort($taglist, 'strcasecmp');
1804         $link['taglist']=$taglist;
1805
1806         if ($link["url"][0] === '?' && // Check for both signs of a note: starting with ? and 7 chars long. I doubt that you'll post any links that look like this.
1807             strlen($link["url"]) === 7) {
1808             $link["url"] = indexUrl() . $link["url"];
1809         }
1810
1811         $linkDisp[$keys[$i]] = $link;
1812         $i++;
1813     }
1814
1815     // Compute paging navigation
1816     $searchterm= ( empty($_GET['searchterm']) ? '' : '&searchterm='.$_GET['searchterm'] );
1817     $searchtags= ( empty($_GET['searchtags']) ? '' : '&searchtags='.$_GET['searchtags'] );
1818     $paging='';
1819     $previous_page_url=''; if ($i!=count($keys)) $previous_page_url='?page='.($page+1).$searchterm.$searchtags;
1820     $next_page_url='';if ($page>1) $next_page_url='?page='.($page-1).$searchterm.$searchtags;
1821
1822     $token = ''; if (isLoggedIn()) $token=getToken();
1823
1824     // Fill all template fields.
1825     $PAGE->assign('linkcount',count($LINKSDB));
1826     $PAGE->assign('previous_page_url',$previous_page_url);
1827     $PAGE->assign('next_page_url',$next_page_url);
1828     $PAGE->assign('page_current',$page);
1829     $PAGE->assign('page_max',$pagecount);
1830     $PAGE->assign('result_count',count($linksToDisplay));
1831     $PAGE->assign('search_type',$search_type);
1832     $PAGE->assign('search_crits',$search_crits);
1833     $PAGE->assign('redirector',empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector']); // Optional redirector URL.
1834     $PAGE->assign('token',$token);
1835     $PAGE->assign('links',$linkDisp);
1836     $PAGE->assign('tags', $LINKSDB->allTags());
1837     return;
1838 }
1839
1840 // Compute the thumbnail for a link.
1841 //
1842 // With a link to the original URL.
1843 // Understands various services (youtube.com...)
1844 // Input: $url = URL for which the thumbnail must be found.
1845 //        $href = if provided, this URL will be followed instead of $url
1846 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1847 // Some of them may be missing.
1848 // Return an empty array if no thumbnail available.
1849 function computeThumbnail($url,$href=false)
1850 {
1851     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
1852     if ($href==false) $href=$url;
1853
1854     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1855     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1856     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1857     $domain = parse_url($url,PHP_URL_HOST);
1858     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1859     {
1860         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1861         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1862                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1863     }
1864     if ($domain=='youtu.be') // Youtube short links
1865     {
1866         $path = parse_url($url,PHP_URL_PATH);
1867         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1868                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1869     }
1870     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1871     {
1872         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1873         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1874                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1875     }
1876
1877     if ($domain=='imgur.com')
1878     {
1879         $path = parse_url($url,PHP_URL_PATH);
1880         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1881         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1882                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1883         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1884                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1885
1886         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1887                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1888     }
1889     if ($domain=='i.imgur.com')
1890     {
1891         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1892         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1893                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1894     }
1895     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1896     {
1897         if (strpos($url,'dailymotion.com/video/')!==false)
1898         {
1899             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1900             return array('src'=>$thumburl,
1901                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1902         }
1903     }
1904     if (endsWith($domain,'.imageshack.us'))
1905     {
1906         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1907         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1908         {
1909             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1910             return array('src'=>$thumburl,
1911                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1912         }
1913     }
1914
1915     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1916     // So we deport the thumbnail generation in order not to slow down page generation
1917     // (and we also cache the thumbnail)
1918
1919     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1920
1921     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1922         || $domain=='vimeo.com'
1923         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1924         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1925     )
1926     {
1927         if ($domain=='vimeo.com')
1928         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1929             $path = parse_url($url,PHP_URL_PATH);
1930             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1931         }
1932         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
1933         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
1934             $path = parse_url($url,PHP_URL_PATH);
1935             if (!preg_match('!/\d+.+?!',$path)) return array();
1936         }
1937         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
1938         {   // Make sure this TED URL points to a video (/talks/...)
1939             $path = parse_url($url,PHP_URL_PATH);
1940             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
1941         }
1942         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1943         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1944                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1945     }
1946
1947     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1948     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1949     // But using the extension will do.
1950     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1951     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1952     {
1953         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1954         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1955                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1956     }
1957     return array(); // No thumbnail.
1958
1959 }
1960
1961
1962 // Returns the HTML code to display a thumbnail for a link
1963 // with a link to the original URL.
1964 // Understands various services (youtube.com...)
1965 // Input: $url = URL for which the thumbnail must be found.
1966 //        $href = if provided, this URL will be followed instead of $url
1967 // Returns '' if no thumbnail available.
1968 function thumbnail($url,$href=false)
1969 {
1970     $t = computeThumbnail($url,$href);
1971     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1972
1973     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
1974     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1975     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1976     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1977     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1978     $html.='></a>';
1979     return $html;
1980 }
1981
1982 // Returns the HTML code to display a thumbnail for a link
1983 // for the picture wall (using lazy image loading)
1984 // Understands various services (youtube.com...)
1985 // Input: $url = URL for which the thumbnail must be found.
1986 //        $href = if provided, this URL will be followed instead of $url
1987 // Returns '' if no thumbnail available.
1988 function lazyThumbnail($url,$href=false)
1989 {
1990     $t = computeThumbnail($url,$href);
1991     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1992
1993     $html='<a href="'.escape($t['href']).'">';
1994
1995     // Lazy image
1996     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
1997
1998     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1999     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2000     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2001     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2002     $html.='>';
2003
2004     // No-JavaScript fallback.
2005     $html.='<noscript><img src="'.escape($t['src']).'"';
2006     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2007     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2008     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2009     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2010     $html.='></noscript></a>';
2011
2012     return $html;
2013 }
2014
2015
2016 // -----------------------------------------------------------------------------------------------
2017 // Installation
2018 // This function should NEVER be called if the file data/config.php exists.
2019 function install()
2020 {
2021     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2022     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2023
2024
2025     // This part makes sure sessions works correctly.
2026     // (Because on some hosts, session.save_path may not be set correctly,
2027     // or we may not have write access to it.)
2028     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2029     {   // Step 2: Check if data in session is correct.
2030         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2031         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2032         echo 'It currently points to '.session_save_path().'<br>';
2033         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2034         echo '<br><a href="?">Click to try again.</a></pre>';
2035         die;
2036     }
2037     if (!isset($_SESSION['session_tested']))
2038     {   // Step 1 : Try to store data in session and reload page.
2039         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2040         header('Location: '.indexUrl().'?test_session');  // Redirect to check stored data.
2041     }
2042     if (isset($_GET['test_session']))
2043     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2044         header('Location: '.indexUrl());
2045     }
2046
2047
2048     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2049     {
2050         $tz = 'UTC';
2051         if (!empty($_POST['continent']) && !empty($_POST['city']))
2052             if (isTZvalid($_POST['continent'],$_POST['city']))
2053                 $tz = $_POST['continent'].'/'.$_POST['city'];
2054         $GLOBALS['timezone'] = $tz;
2055         // Everything is ok, let's create config file.
2056         $GLOBALS['login'] = $_POST['setlogin'];
2057         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2058         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2059         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(indexUrl()) : $_POST['title'] );
2060         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2061         try {
2062             writeConfig($GLOBALS, isLoggedIn());
2063         }
2064         catch(Exception $e) {
2065             error_log(
2066                     'ERROR while writing config file after installation.' . PHP_EOL .
2067                     $e->getMessage()
2068                 );
2069
2070             // TODO: do not handle exceptions/errors in JS.
2071             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2072             exit;
2073         }
2074         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2075         exit;
2076     }
2077
2078     // Display config form:
2079     list($timezone_form,$timezone_js) = templateTZform();
2080     $timezone_html=''; if ($timezone_form!='') $timezone_html='<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2081
2082     $PAGE = new pageBuilder;
2083     $PAGE->assign('timezone_html',$timezone_html);
2084     $PAGE->assign('timezone_js',$timezone_js);
2085     $PAGE->renderPage('install');
2086     exit;
2087 }
2088
2089 // Generates the timezone selection form and JavaScript.
2090 // Input: (optional) current timezone (can be 'UTC/UTC'). It will be pre-selected.
2091 // Output: array(html,js)
2092 // Example: list($htmlform,$js) = templateTZform('Europe/Paris');  // Europe/Paris pre-selected.
2093 // Returns array('','') if server does not support timezones list. (e.g. PHP 5.1 on free.fr)
2094 function templateTZform($ptz=false)
2095 {
2096     if (function_exists('timezone_identifiers_list')) // because of old PHP version (5.1) which can be found on free.fr
2097     {
2098         // Try to split the provided timezone.
2099         if ($ptz==false) { $l=timezone_identifiers_list(); $ptz=$l[0]; }
2100         $spos=strpos($ptz,'/'); $pcontinent=substr($ptz,0,$spos); $pcity=substr($ptz,$spos+1);
2101
2102         // Display config form:
2103         $timezone_form = '';
2104         $timezone_js = '';
2105         // The list is in the form "Europe/Paris", "America/Argentina/Buenos_Aires"...
2106         // We split the list in continents/cities.
2107         $continents = array();
2108         $cities = array();
2109         foreach(timezone_identifiers_list() as $tz)
2110         {
2111             if ($tz=='UTC') $tz='UTC/UTC';
2112             $spos = strpos($tz,'/');
2113             if ($spos!==false)
2114             {
2115                 $continent=substr($tz,0,$spos); $city=substr($tz,$spos+1);
2116                 $continents[$continent]=1;
2117                 if (!isset($cities[$continent])) $cities[$continent]='';
2118                 $cities[$continent].='<option value="'.$city.'"'.($pcity==$city?' selected':'').'>'.$city.'</option>';
2119             }
2120         }
2121         $continents_html = '';
2122         $continents = array_keys($continents);
2123         foreach($continents as $continent)
2124             $continents_html.='<option  value="'.$continent.'"'.($pcontinent==$continent?' selected':'').'>'.$continent.'</option>';
2125         $cities_html = $cities[$pcontinent];
2126         $timezone_form = "Continent: <select name=\"continent\" id=\"continent\" onChange=\"onChangecontinent();\">${continents_html}</select>";
2127         $timezone_form .= "&nbsp;&nbsp;&nbsp;&nbsp;City: <select name=\"city\" id=\"city\">${cities[$pcontinent]}</select><br />";
2128         $timezone_js = "<script>";
2129         $timezone_js .= "function onChangecontinent(){document.getElementById(\"city\").innerHTML = citiescontinent[document.getElementById(\"continent\").value];}";
2130         $timezone_js .= "var citiescontinent = ".json_encode($cities).";" ;
2131         $timezone_js .= "</script>" ;
2132         return array($timezone_form,$timezone_js);
2133     }
2134     return array('','');
2135 }
2136
2137 // Tells if a timezone is valid or not.
2138 // If not valid, returns false.
2139 // If system does not support timezone list, returns false.
2140 function isTZvalid($continent,$city)
2141 {
2142     $tz = $continent.'/'.$city;
2143     if (function_exists('timezone_identifiers_list')) // because of old PHP version (5.1) which can be found on free.fr
2144     {
2145         if (in_array($tz, timezone_identifiers_list())) // it's a valid timezone?
2146                     return true;
2147     }
2148     return false;
2149 }
2150 if (!function_exists('json_encode')) {
2151     function json_encode($data) {
2152         switch ($type = gettype($data)) {
2153             case 'NULL':
2154                 return 'null';
2155             case 'boolean':
2156                 return ($data ? 'true' : 'false');
2157             case 'integer':
2158             case 'double':
2159             case 'float':
2160                 return $data;
2161             case 'string':
2162                 return '"' . addslashes($data) . '"';
2163             case 'object':
2164                 $data = get_object_vars($data);
2165             case 'array':
2166                 $output_index_count = 0;
2167                 $output_indexed = array();
2168                 $output_associative = array();
2169                 foreach ($data as $key => $value) {
2170                     $output_indexed[] = json_encode($value);
2171                     $output_associative[] = json_encode($key) . ':' . json_encode($value);
2172                     if ($output_index_count !== NULL && $output_index_count++ !== $key) {
2173                         $output_index_count = NULL;
2174                     }
2175                 }
2176                 if ($output_index_count !== NULL) {
2177                     return '[' . implode(',', $output_indexed) . ']';
2178                 } else {
2179                     return '{' . implode(',', $output_associative) . '}';
2180                 }
2181             default:
2182                 return ''; // Not supported
2183         }
2184     }
2185 }
2186
2187
2188
2189 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2190    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2191    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2192    This function is called by passing the URL:
2193    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2194    [URL] is the URL of the link (e.g. a flickr page)
2195    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2196    The function below will fetch the image from the webservice and store it in the cache.
2197 */
2198 function genThumbnail()
2199 {
2200     // Make sure the parameters in the URL were generated by us.
2201     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2202     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2203
2204     // Let's see if we don't already have the image for this URL in the cache.
2205     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2206     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2207     {   // We have the thumbnail, just serve it:
2208         header('Content-Type: image/jpeg');
2209         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2210         return;
2211     }
2212     // We may also serve a blank image (if service did not respond)
2213     $blankname=hash('sha1',$_GET['url']).'.gif';
2214     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2215     {
2216         header('Content-Type: image/gif');
2217         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2218         return;
2219     }
2220
2221     // Otherwise, generate the thumbnail.
2222     $url = $_GET['url'];
2223     $domain = parse_url($url,PHP_URL_HOST);
2224
2225     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2226     {
2227         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2228         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2229
2230         // Is this a link to an image, or to a flickr page ?
2231         $imageurl='';
2232         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2233         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2234             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2235             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2236         }
2237         else // This is a flickr page (html)
2238         {
2239             list($httpstatus,$headers,$data) = getHTTP($url,20); // Get the flickr html page.
2240             if (strpos($httpstatus,'200 OK')!==false)
2241             {
2242                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2243                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!',$data,$matches);
2244                 if (!empty($matches[1])) $imageurl=$matches[1];
2245
2246                 // In albums (and some other pages), the link rel="image_src" is not provided,
2247                 // but flickr provides:
2248                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2249                 if ($imageurl=='')
2250                 {
2251                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!',$data,$matches);
2252                     if (!empty($matches[1])) $imageurl=$matches[1];
2253                 }
2254             }
2255         }
2256
2257         if ($imageurl!='')
2258         {   // Let's download the image.
2259             list($httpstatus,$headers,$data) = getHTTP($imageurl,10); // Image is 240x120, so 10 seconds to download should be enough.
2260             if (strpos($httpstatus,'200 OK')!==false)
2261             {
2262                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2263                 header('Content-Type: image/jpeg');
2264                 echo $data;
2265                 return;
2266             }
2267         }
2268     }
2269
2270     elseif ($domain=='vimeo.com' )
2271     {
2272         // This is more complex: we have to perform a HTTP request, then parse the result.
2273         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2274         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2275         list($httpstatus,$headers,$data) = getHTTP('https://vimeo.com/api/v2/video/'.escape($vid).'.php',5);
2276         if (strpos($httpstatus,'200 OK')!==false)
2277         {
2278             $t = unserialize($data);
2279             $imageurl = $t[0]['thumbnail_medium'];
2280             // Then we download the image and serve it to our client.
2281             list($httpstatus,$headers,$data) = getHTTP($imageurl,10);
2282             if (strpos($httpstatus,'200 OK')!==false)
2283             {
2284                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2285                 header('Content-Type: image/jpeg');
2286                 echo $data;
2287                 return;
2288             }
2289         }
2290     }
2291
2292     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2293     {
2294         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2295         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2296         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2297         list($httpstatus,$headers,$data) = getHTTP($url,5);
2298         if (strpos($httpstatus,'200 OK')!==false)
2299         {
2300             // Extract the link to the thumbnail
2301             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!',$data,$matches);
2302             if (!empty($matches[1]))
2303             {   // Let's download the image.
2304                 $imageurl=$matches[1];
2305                 list($httpstatus,$headers,$data) = getHTTP($imageurl,20); // No control on image size, so wait long enough.
2306                 if (strpos($httpstatus,'200 OK')!==false)
2307                 {
2308                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2309                     file_put_contents($filepath,$data); // Save image to cache.
2310                     if (resizeImage($filepath))
2311                     {
2312                         header('Content-Type: image/jpeg');
2313                         echo file_get_contents($filepath);
2314                         return;
2315                     }
2316                 }
2317             }
2318         }
2319     }
2320
2321     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2322     {
2323         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2324         // http://xkcd.com/327/
2325         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2326         list($httpstatus,$headers,$data) = getHTTP($url,5);
2327         if (strpos($httpstatus,'200 OK')!==false)
2328         {
2329             // Extract the link to the thumbnail
2330             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!',$data,$matches);
2331             if (!empty($matches[1]))
2332             {   // Let's download the image.
2333                 $imageurl=$matches[1];
2334                 list($httpstatus,$headers,$data) = getHTTP($imageurl,20); // No control on image size, so wait long enough.
2335                 if (strpos($httpstatus,'200 OK')!==false)
2336                 {
2337                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2338                     file_put_contents($filepath,$data); // Save image to cache.
2339                     if (resizeImage($filepath))
2340                     {
2341                         header('Content-Type: image/jpeg');
2342                         echo file_get_contents($filepath);
2343                         return;
2344                     }
2345                 }
2346             }
2347         }
2348     }
2349
2350     else
2351     {
2352         // For all other domains, we try to download the image and make a thumbnail.
2353         list($httpstatus,$headers,$data) = getHTTP($url,30);  // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2354         if (strpos($httpstatus,'200 OK')!==false)
2355         {
2356             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2357             file_put_contents($filepath,$data); // Save image to cache.
2358             if (resizeImage($filepath))
2359             {
2360                 header('Content-Type: image/jpeg');
2361                 echo file_get_contents($filepath);
2362                 return;
2363             }
2364         }
2365     }
2366
2367
2368     // Otherwise, return an empty image (8x8 transparent gif)
2369     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2370     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2371     header('Content-Type: image/gif');
2372     echo $blankgif;
2373 }
2374
2375 // Make a thumbnail of the image (to width: 120 pixels)
2376 // Returns true if success, false otherwise.
2377 function resizeImage($filepath)
2378 {
2379     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2380
2381     // Trick: some stupid people rename GIF as JPEG... or else.
2382     // So we really try to open each image type whatever the extension is.
2383     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2384     $im=false;
2385     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2386     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2387     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2388     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2389     $w = imagesx($im);
2390     $h = imagesy($im);
2391     $ystart = 0; $yheight=$h;
2392     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2393     $nw = 120;   // Desired width
2394     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2395     // Resize image:
2396     $im2 = imagecreatetruecolor($nw,$nh);
2397     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2398     imageinterlace($im2,true); // For progressive JPEG.
2399     $tempname=$filepath.'_TEMP.jpg';
2400     imagejpeg($im2, $tempname, 90);
2401     imagedestroy($im);
2402     imagedestroy($im2);
2403     unlink($filepath);
2404     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2405     return true;
2406 }
2407
2408 // Invalidate caches when the database is changed or the user logs out.
2409 // (e.g. tags cache).
2410 function invalidateCaches()
2411 {
2412     unset($_SESSION['tags']);  // Purge cache attached to session.
2413     pageCache::purgeCache();   // Purge page cache shared by sessions.
2414 }
2415
2416 try {
2417     mergeDeprecatedConfig($GLOBALS, isLoggedIn());
2418 } catch(Exception $e) {
2419     error_log(
2420         'ERROR while merging deprecated options.php file.' . PHP_EOL .
2421         $e->getMessage()
2422     );
2423 }
2424
2425 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2426 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2427 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2428 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2429 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=daily')) { showDaily(); exit; }
2430 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2431 renderPage();
2432 ?>