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 creating the file /data/options.php)
  15 $GLOBALS['config']['DATADIR'] = 'data'; // Data subdirectory
  16 $GLOBALS['config']['CONFIG_FILE'] = $GLOBALS['config']['DATADIR'].'/config.php'; // Configuration file (user login/password)
  17 $GLOBALS['config']['DATASTORE'] = $GLOBALS['config']['DATADIR'].'/datastore.php'; // Data storage file.
  18 $GLOBALS['config']['LINKS_PER_PAGE'] = 20; // Default links per page.
  19 $GLOBALS['config']['IPBANS_FILENAME'] = $GLOBALS['config']['DATADIR'].'/ipbans.php'; // File storage for failures and bans.
  20 $GLOBALS['config']['BAN_AFTER'] = 4;        // Ban IP after this many failures.
  21 $GLOBALS['config']['BAN_DURATION'] = 1800;  // Ban duration for IP address after login failures (in seconds) (1800 sec. = 30 minutes)
  22 $GLOBALS['config']['OPEN_SHAARLI'] = false; // If true, anyone can add/edit/delete links without having to login
  23 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false; // If true, the moment when links were saved are not shown to users that are not logged in.
  24 $GLOBALS['config']['SHOW_ATOM'] = false; // If true, an extra "ATOM feed" button will be displayed in the toolbar
  25 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true; // Enable thumbnails in links.
  26 $GLOBALS['config']['CACHEDIR'] = 'cache'; // Cache directory for thumbnails for SLOW services (like flickr)
  27 $GLOBALS['config']['PAGECACHE'] = 'pagecache'; // Page cache directory.
  28 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true; // Enable Shaarli to store thumbnail in a local cache. Disable to reduce web space usage.
  29 $GLOBALS['config']['PUBSUBHUB_URL'] = ''; // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
  30 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp/' ; // Raintpl cache directory  (keep the trailing slash!)
  31 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/' ; // Raintpl template directory (keep the trailing slash!)
  32 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt'; // For updates check of Shaarli.
  33 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400 ; // Updates check frequency for Shaarli. 86400 seconds=24 hours
  34                                           // Note: You must have publisher.php in the same directory as Shaarli index.php
  35 $GLOBALS['config']['ARCHIVE_ORG'] = false; // For each link, add a link to an archived version on archive.org
  36 $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.
  37 $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = false;
  38 // -----------------------------------------------------------------------------------------------
  39 // You should not touch below (or at your own risks!)
  40 // Optional config file.
  41 if (is_file($GLOBALS['config']['DATADIR'].'/options.php')) require($GLOBALS['config']['DATADIR'].'/options.php');
  42
  43 define('shaarli_version','0.0.45beta');
  44 define('PHPPREFIX','<?php /* '); // Prefix to encapsulate data in PHP code.
  45 define('PHPSUFFIX',' */ ?>'); // Suffix to encapsulate data in PHP code.
  46 // http://server.com/x/shaarli --> /shaarli/
  47 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
  48
  49 // Force cookie path (but do not change lifetime)
  50 $cookie=session_get_cookie_params();
  51 $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
  52 session_set_cookie_params($cookie['lifetime'],$cookiedir,$_SERVER['SERVER_NAME']); // Set default cookie expiration and path.
  53
  54 // Set session parameters on server side.
  55 define('INACTIVITY_TIMEOUT',3600); // (in seconds). If the user does not access any page within this time, his/her session is considered expired.
  56 ini_set('session.use_cookies', 1);       // Use cookies to store session.
  57 ini_set('session.use_only_cookies', 1);  // Force cookies for session (phpsessionID forbidden in URL).
  58 ini_set('session.use_trans_sid', false); // Prevent PHP form using sessionID in URL if cookies are disabled.
  59 session_name('shaarli');
  60 if (session_id() == '') session_start();  // Start session if needed (Some server auto-start sessions).
  61
  62 // PHP Settings
  63 ini_set('max_input_time','60');  // High execution time in case of problematic imports/exports.
  64 ini_set('memory_limit', '128M');  // Try to set max upload file size and read (May not work on some hosts).
  65 ini_set('post_max_size', '16M');
  66 ini_set('upload_max_filesize', '16M');
  67 checkphpversion();
  68 error_reporting(E_ALL^E_WARNING);  // See all error except warnings.
  69 //error_reporting(-1); // See all errors (for debugging only)
  70
  71 // Shaarli library
  72 require_once 'application/LinkDB.php';
  73 require_once 'application/Utils.php';
  74
  75 include "inc/rain.tpl.class.php"; //include Rain TPL
  76 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
  77 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
  78
  79 ob_start();  // Output buffering for the page cache.
  80
  81
  82 // In case stupid admin has left magic_quotes enabled in php.ini:
  83 if (get_magic_quotes_gpc())
  84 {
  85     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
  86     $_POST = array_map('stripslashes_deep', $_POST);
  87     $_GET = array_map('stripslashes_deep', $_GET);
  88     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
  89 }
  90
  91 // Prevent caching on client side or proxy: (yes, it's ugly)
  92 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
  93 header("Cache-Control: no-store, no-cache, must-revalidate");
  94 header("Cache-Control: post-check=0, pre-check=0", false);
  95 header("Pragma: no-cache");
  96
  97 // Directories creations (Note that your web host may require different rights than 705.)
  98 if (!is_writable(realpath(dirname(__FILE__)))) die('<pre>ERROR: Shaarli does not have the right to write in its own directory.</pre>');
  99
 100 // Handling of old config file which do not have the new parameters.
 101 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.htmlspecialchars(indexUrl());
 102 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 103 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 104 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 105 if (empty($GLOBALS['disablejquery'])) $GLOBALS['disablejquery']=false;
 106 if (empty($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'])) install();
 112
 113 require $GLOBALS['config']['CONFIG_FILE'];  // Read login/password hash into $GLOBALS.
 114
 115 // a token depending of deployment salt, user password, and the current ip
 116 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 117
 118 autoLocale(); // Sniff browser language and set date format accordingly.
 119 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 120
 121 //==================================================================================================
 122 // Checking session state (i.e. is the user still logged in)
 123 //==================================================================================================
 124
 125 function setup_login_state() {
 126         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 127         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 128         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 129             $userIsLoggedIn = true;
 130         }
 131         if (!isset($GLOBALS['login'])) {
 132             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 133             $loginFailure = true;
 134         }
 135         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 136             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 137             !$loginFailure)
 138         {
 139             fillSessionInfo();
 140             $userIsLoggedIn = true;
 141         }
 142         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 143         if (empty($_SESSION['uid']) ||
 144             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 145             time() >= $_SESSION['expires_on'])
 146         {
 147             logout();
 148             $userIsLoggedIn = false;
 149             $loginFailure = true;
 150         }
 151         if (!empty($_SESSION['longlastingsession'])) {
 152             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 153         }
 154         else {
 155             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 156         }
 157         if (!$loginFailure) {
 158             $userIsLoggedIn = true;
 159         }
 160
 161         return $userIsLoggedIn;
 162 }
 163 //==================================================================================================
 164 $userIsLoggedIn = setup_login_state();
 165 //==================================================================================================
 166 //==================================================================================================
 167
 168 // Check PHP version
 169 function checkphpversion()
 170 {
 171     if (version_compare(PHP_VERSION, '5.1.0') < 0)
 172     {
 173         header('Content-Type: text/plain; charset=utf-8');
 174         echo 'Your PHP version is obsolete! Shaarli requires at least php 5.1.0, and thus cannot run. Sorry. Your PHP version has known security vulnerabilities and should be updated as soon as possible.';
 175         exit;
 176     }
 177 }
 178
 179 // Checks if an update is available for Shaarli.
 180 // (at most once a day, and only for registered user.)
 181 // Output: '' = no new version.
 182 //         other= the available version.
 183 function checkUpdate()
 184 {
 185     if (!isLoggedIn()) return ''; // Do not check versions for visitors.
 186     if (empty($GLOBALS['config']['ENABLE_UPDATECHECK'])) return ''; // Do not check if the user doesn't want to.
 187
 188     // Get latest version number at most once a day.
 189     if (!is_file($GLOBALS['config']['UPDATECHECK_FILENAME']) || (filemtime($GLOBALS['config']['UPDATECHECK_FILENAME'])<time()-($GLOBALS['config']['UPDATECHECK_INTERVAL'])))
 190     {
 191         $version=shaarli_version;
 192         list($httpstatus,$headers,$data) = getHTTP('https://raw.githubusercontent.com/shaarli/Shaarli/master/shaarli_version.php',2);
 193         if (strpos($httpstatus,'200 OK')!==false) $version=str_replace(' */ ?>','',str_replace('<?php /* ','',$data));
 194         // If failed, never mind. We don't want to bother the user with that.
 195         file_put_contents($GLOBALS['config']['UPDATECHECK_FILENAME'],$version); // touch file date
 196     }
 197     // Compare versions:
 198     $newestversion=file_get_contents($GLOBALS['config']['UPDATECHECK_FILENAME']);
 199     if (version_compare($newestversion,shaarli_version)==1) return $newestversion;
 200     return '';
 201 }
 202
 203
 204 // -----------------------------------------------------------------------------------------------
 205 // Simple cache system (mainly for the RSS/ATOM feeds).
 206
 207 class pageCache
 208 {
 209     private $url; // Full URL of the page to cache (typically the value returned by pageUrl())
 210     private $shouldBeCached; // boolean: Should this url be cached?
 211     private $filename; // Name of the cache file for this url.
 212
 213     /*
 214          $url = URL (typically the value returned by pageUrl())
 215          $shouldBeCached = boolean. If false, the cache will be disabled.
 216     */
 217     public function __construct($url,$shouldBeCached)
 218     {
 219         $this->url = $url;
 220         $this->filename = $GLOBALS['config']['PAGECACHE'].'/'.sha1($url).'.cache';
 221         $this->shouldBeCached = $shouldBeCached;
 222     }
 223
 224     // If the page should be cached and a cached version exists,
 225     // returns the cached version (otherwise, return null).
 226     public function cachedVersion()
 227     {
 228         if (!$this->shouldBeCached) return null;
 229         if (is_file($this->filename)) { return file_get_contents($this->filename); exit; }
 230         return null;
 231     }
 232
 233     // Put a page in the cache.
 234     public function cache($page)
 235     {
 236         if (!$this->shouldBeCached) return;
 237         file_put_contents($this->filename,$page);
 238     }
 239
 240     // Purge the whole cache.
 241     // (call with pageCache::purgeCache())
 242     public static function purgeCache()
 243     {
 244         if (is_dir($GLOBALS['config']['PAGECACHE']))
 245         {
 246             $handler = opendir($GLOBALS['config']['PAGECACHE']);
 247             if ($handler!==false)
 248             {
 249                 while (($filename = readdir($handler))!==false)
 250                 {
 251                     if (endsWith($filename,'.cache')) { unlink($GLOBALS['config']['PAGECACHE'].'/'.$filename); }
 252                 }
 253                 closedir($handler);
 254             }
 255         }
 256     }
 257
 258 }
 259
 260
 261 // -----------------------------------------------------------------------------------------------
 262 // Log to text file
 263 function logm($message)
 264 {
 265     $t = strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n";
 266     file_put_contents($GLOBALS['config']['DATADIR'].'/log.txt',$t,FILE_APPEND);
 267 }
 268
 269 // Same as nl2br(), but escapes < and >
 270 function nl2br_escaped($html)
 271 {
 272     return str_replace('>','&gt;',str_replace('<','&lt;',nl2br($html)));
 273 }
 274
 275 // In a string, converts URLs to clickable links.
 276 // Function inspired from http://www.php.net/manual/en/function.preg-replace.php#85722
 277 function text2clickable($url)
 278 {
 279     $redir = empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'];
 280     return preg_replace('!(((?:https?|ftp|file)://|apt:|magnet:)\S+[[:alnum:]]/?)!si','<a href="'.$redir.'$1" rel="nofollow">$1</a>',$url);
 281 }
 282
 283 // This function inserts &nbsp; where relevant so that multiple spaces are properly displayed in HTML
 284 // even in the absence of <pre>  (This is used in description to keep text formatting)
 285 function keepMultipleSpaces($text)
 286 {
 287     return str_replace('  ',' &nbsp;',$text);
 288
 289 }
 290 // ------------------------------------------------------------------------------------------
 291 // Sniff browser language to display dates in the right format automatically.
 292 // (Note that is may not work on your server if the corresponding local is not installed.)
 293 function autoLocale()
 294 {
 295     $attempts = array('en_US'); // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 296     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 297     {   // (It's a bit crude, but it works very well. Preferred language is always presented first.)
 298         if (preg_match('/([a-z]{2})-?([a-z]{2})?/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) {
 299             $loc = $matches[1] . (!empty($matches[2]) ? '_' . strtoupper($matches[2]) : '');
 300             $attempts = array($loc.'.UTF-8', $loc, str_replace('_', '-', $loc).'.UTF-8', str_replace('_', '-', $loc),
 301                 $loc . '_' . strtoupper($loc).'.UTF-8', $loc . '_' . strtoupper($loc),
 302                 $loc . '_' . $loc.'.UTF-8', $loc . '_' . $loc, $loc . '-' . strtoupper($loc).'.UTF-8',
 303                 $loc . '-' . strtoupper($loc), $loc . '-' . $loc.'.UTF-8', $loc . '-' . $loc);
 304         }
 305     }
 306     setlocale(LC_TIME, $attempts);  // LC_TIME = Set local for date/time format only.
 307 }
 308
 309 // ------------------------------------------------------------------------------------------
 310 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 311 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 312 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 313 function pubsubhub()
 314 {
 315     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 316     {
 317        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 318        $topic_url = array (
 319                        indexUrl().'?do=atom',
 320                        indexUrl().'?do=rss'
 321                     );
 322        $p->publish_update($topic_url);
 323     }
 324 }
 325
 326 // ------------------------------------------------------------------------------------------
 327 // Session management
 328
 329 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 330 function allIPs()
 331 {
 332     $ip = $_SERVER["REMOTE_ADDR"];
 333     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 334     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 335     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 336     return $ip;
 337 }
 338
 339 function fillSessionInfo() {
 340         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 341         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 342         $_SESSION['username']=$GLOBALS['login'];
 343         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 344 }
 345
 346 // Check that user/password is correct.
 347 function check_auth($login,$password)
 348 {
 349     $hash = sha1($password.$login.$GLOBALS['salt']);
 350     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 351     {   // Login/password is correct.
 352                 fillSessionInfo();
 353         logm('Login successful');
 354         return True;
 355     }
 356     logm('Login failed for user '.$login);
 357     return False;
 358 }
 359
 360 // Returns true if the user is logged in.
 361 function isLoggedIn()
 362 {
 363     global $userIsLoggedIn;
 364     return $userIsLoggedIn;
 365 }
 366
 367 // Force logout.
 368 function logout() {
 369     if (isset($_SESSION)) {
 370         unset($_SESSION['uid']);
 371         unset($_SESSION['ip']);
 372         unset($_SESSION['username']);
 373         unset($_SESSION['privateonly']);
 374     }
 375     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 376 }
 377
 378
 379 // ------------------------------------------------------------------------------------------
 380 // Brute force protection system
 381 // Several consecutive failed logins will ban the IP address for 30 minutes.
 382 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?>");
 383 include $GLOBALS['config']['IPBANS_FILENAME'];
 384 // Signal a failed login. Will ban the IP if too many failures:
 385 function ban_loginFailed()
 386 {
 387     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 388     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 389     $gb['FAILURES'][$ip]++;
 390     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 391     {
 392         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 393         logm('IP address banned from login');
 394     }
 395     $GLOBALS['IPBANS'] = $gb;
 396     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 397 }
 398
 399 // Signals a successful login. Resets failed login counter.
 400 function ban_loginOk()
 401 {
 402     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 403     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 404     $GLOBALS['IPBANS'] = $gb;
 405     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 406 }
 407
 408 // Checks if the user CAN login. If 'true', the user can try to login.
 409 function ban_canLogin()
 410 {
 411     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 412     if (isset($gb['BANS'][$ip]))
 413     {
 414         // User is banned. Check if the ban has expired:
 415         if ($gb['BANS'][$ip]<=time())
 416         {   // Ban expired, user can try to login again.
 417             logm('Ban lifted.');
 418             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 419             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 420             return true; // Ban has expired, user can login.
 421         }
 422         return false; // User is banned.
 423     }
 424     return true; // User is not banned.
 425 }
 426
 427 // ------------------------------------------------------------------------------------------
 428 // Process login form: Check if login/password is correct.
 429 if (isset($_POST['login']))
 430 {
 431     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 432     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 433     {   // Login/password is OK.
 434         ban_loginOk();
 435         // If user wants to keep the session cookie even after the browser closes:
 436         if (!empty($_POST['longlastingsession']))
 437         {
 438                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 439             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 440             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 441
 442             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 443             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 444             // Note: Never forget the trailing slash on the cookie path!
 445             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 446         }
 447         else // Standard session expiration (=when browser closes)
 448         {
 449             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 450             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 451             session_regenerate_id(true);
 452         }
 453         // Optional redirect after login:
 454         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; }
 455         if (isset($_POST['returnurl']))
 456         {
 457             if (endsWith($_POST['returnurl'],'?do=login')) { header('Location: ?'); exit; } // Prevent loops over login screen.
 458             header('Location: '.$_POST['returnurl']); exit;
 459         }
 460         header('Location: ?'); exit;
 461     }
 462     else
 463     {
 464         ban_loginFailed();
 465         $redir = '';
 466         if (isset($_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']):''); }
 467         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 468         exit;
 469     }
 470 }
 471
 472 // ------------------------------------------------------------------------------------------
 473 // Misc utility functions:
 474
 475 // Returns the server URL (including port and http/https), without path.
 476 // e.g. "http://myserver.com:8080"
 477 // You can append $_SERVER['SCRIPT_NAME'] to get the current script URL.
 478 function serverUrl()
 479 {
 480     $https = (!empty($_SERVER['HTTPS']) && (strtolower($_SERVER['HTTPS'])=='on')) || $_SERVER["SERVER_PORT"]=='443'; // HTTPS detection.
 481     $serverport = ($_SERVER["SERVER_PORT"]=='80' || ($https && $_SERVER["SERVER_PORT"]=='443') ? '' : ':'.$_SERVER["SERVER_PORT"]);
 482     return 'http'.($https?'s':'').'://'.$_SERVER['SERVER_NAME'].$serverport;
 483 }
 484
 485 // Returns the absolute URL of current script, without the query.
 486 // (e.g. http://sebsauvage.net/links/)
 487 function indexUrl()
 488 {
 489     $scriptname = $_SERVER["SCRIPT_NAME"];
 490     // If the script is named 'index.php', we remove it (for better looking URLs,
 491     // e.g. http://mysite.com/shaarli/?abcde instead of http://mysite.com/shaarli/index.php?abcde)
 492     if (endswith($scriptname,'index.php')) $scriptname = substr($scriptname,0,strlen($scriptname)-9);
 493     return serverUrl() . $scriptname;
 494 }
 495
 496 // Returns the absolute URL of current script, WITH the query.
 497 // (e.g. http://sebsauvage.net/links/?toto=titi&spamspamspam=humbug)
 498 function pageUrl()
 499 {
 500     return indexUrl().(!empty($_SERVER["QUERY_STRING"]) ? '?'.$_SERVER["QUERY_STRING"] : '');
 501 }
 502
 503 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 504 function return_bytes($val)
 505 {
 506     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 507     switch($last)
 508     {
 509         case 'g': $val *= 1024;
 510         case 'm': $val *= 1024;
 511         case 'k': $val *= 1024;
 512     }
 513     return $val;
 514 }
 515
 516 // Try to determine max file size for uploads (POST).
 517 // Returns an integer (in bytes)
 518 function getMaxFileSize()
 519 {
 520     $size1 = return_bytes(ini_get('post_max_size'));
 521     $size2 = return_bytes(ini_get('upload_max_filesize'));
 522     // Return the smaller of two:
 523     $maxsize = min($size1,$size2);
 524     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 525     return $maxsize;
 526 }
 527
 528 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 529     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 530     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 531 function linkdate2timestamp($linkdate)
 532 {
 533     if(strcmp($linkdate, '_000000') !== 0 || !$linkdate){
 534         $Y=$M=$D=$h=$m=$s=0;
 535         $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 536         return mktime($h,$m,$s,$M,$D,$Y);
 537     }
 538     return time();
 539 }
 540
 541 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 542     (used to build the pubDate attribute in RSS feed.)  */
 543 function linkdate2rfc822($linkdate)
 544 {
 545     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 546 }
 547
 548 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 549     (used to build the updated tags in ATOM feed.)  */
 550 function linkdate2iso8601($linkdate)
 551 {
 552     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 553 }
 554
 555 // Parse HTTP response headers and return an associative array.
 556 function http_parse_headers_shaarli( $headers )
 557 {
 558     $res=array();
 559     foreach($headers as $header)
 560     {
 561         $i = strpos($header,': ');
 562         if ($i!==false)
 563         {
 564             $key=substr($header,0,$i);
 565             $value=substr($header,$i+2,strlen($header)-$i-2);
 566             $res[$key]=$value;
 567         }
 568     }
 569     return $res;
 570 }
 571
 572 /* GET an URL.
 573    Input: $url : URL to get (http://...)
 574           $timeout : Network timeout (will wait this many seconds for an anwser before giving up).
 575    Output: An array.  [0] = HTTP status message (e.g. "HTTP/1.1 200 OK") or error message
 576                       [1] = associative array containing HTTP response headers (e.g. echo getHTTP($url)[1]['Content-Type'])
 577                       [2] = data
 578     Example: list($httpstatus,$headers,$data) = getHTTP('http://sebauvage.net/');
 579              if (strpos($httpstatus,'200 OK')!==false)
 580                  echo 'Data type: '.htmlspecialchars($headers['Content-Type']);
 581              else
 582                  echo 'There was an error: '.htmlspecialchars($httpstatus)
 583 */
 584 function getHTTP($url,$timeout=30)
 585 {
 586     try
 587     {
 588         $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
 589         $context = stream_context_create($options);
 590         $data=file_get_contents($url,false,$context,-1, 4000000); // We download at most 4 Mb from source.
 591         if (!$data) { return array('HTTP Error',array(),''); }
 592         $httpStatus=$http_response_header[0]; // e.g. "HTTP/1.1 200 OK"
 593         $responseHeaders=http_parse_headers_shaarli($http_response_header);
 594         return array($httpStatus,$responseHeaders,$data);
 595     }
 596     catch (Exception $e)  // getHTTP *can* fail silently (we don't care if the title cannot be fetched)
 597     {
 598         return array($e->getMessage(),'','');
 599     }
 600 }
 601
 602 // Extract title from an HTML document.
 603 // (Returns an empty string if not found.)
 604 function html_extract_title($html)
 605 {
 606   return preg_match('!<title>(.*?)</title>!is', $html, $matches) ? trim(str_replace("\n",' ', $matches[1])) : '' ;
 607 }
 608
 609 // ------------------------------------------------------------------------------------------
 610 // Token management for XSRF protection
 611 // Token should be used in any form which acts on data (create,update,delete,import...).
 612 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 613
 614 // Returns a token.
 615 function getToken()
 616 {
 617     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 618     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 619     return $rnd;
 620 }
 621
 622 // Tells if a token is OK. Using this function will destroy the token.
 623 // true=token is OK.
 624 function tokenOk($token)
 625 {
 626     if (isset($_SESSION['tokens'][$token]))
 627     {
 628         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 629         return true; // Token is OK.
 630     }
 631     return false; // Wrong token, or already used.
 632 }
 633
 634 // ------------------------------------------------------------------------------------------
 635 /* This class is in charge of building the final page.
 636    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 637    p = new pageBuilder;
 638    p.assign('myfield','myvalue');
 639    p.renderPage('mytemplate');
 640
 641 */
 642 class pageBuilder
 643 {
 644     private $tpl; // RainTPL template
 645
 646     function __construct()
 647     {
 648         $this->tpl=false;
 649     }
 650
 651     private function initialize()
 652     {
 653         $this->tpl = new RainTPL;
 654         $this->tpl->assign('newversion',checkUpdate());
 655         $this->tpl->assign('feedurl',htmlspecialchars(indexUrl()));
 656         $searchcrits=''; // Search criteria
 657         if (!empty($_GET['searchtags'])) $searchcrits.='&searchtags='.urlencode($_GET['searchtags']);
 658         elseif (!empty($_GET['searchterm'])) $searchcrits.='&searchterm='.urlencode($_GET['searchterm']);
 659         $this->tpl->assign('searchcrits',$searchcrits);
 660         $this->tpl->assign('source',indexUrl());
 661         $this->tpl->assign('version',shaarli_version);
 662         $this->tpl->assign('scripturl',indexUrl());
 663         $this->tpl->assign('pagetitle','Shaarli');
 664         $this->tpl->assign('privateonly',!empty($_SESSION['privateonly'])); // Show only private links?
 665         if (!empty($GLOBALS['title'])) $this->tpl->assign('pagetitle',$GLOBALS['title']);
 666         if (!empty($GLOBALS['titleLink'])) $this->tpl->assign('titleLink',$GLOBALS['titleLink']);
 667         if (!empty($GLOBALS['pagetitle'])) $this->tpl->assign('pagetitle',$GLOBALS['pagetitle']);
 668         $this->tpl->assign('shaarlititle',empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title'] );
 669         return;
 670     }
 671
 672     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 673     public function assign($what,$where)
 674     {
 675         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 676         $this->tpl->assign($what,$where);
 677     }
 678
 679     // Render a specific page (using a template).
 680     // e.g. pb.renderPage('picwall')
 681     public function renderPage($page)
 682     {
 683         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 684         $this->tpl->draw($page);
 685     }
 686 }
 687
 688 // ------------------------------------------------------------------------------------------
 689 // Output the last N links in RSS 2.0 format.
 690 function showRSS()
 691 {
 692     header('Content-Type: application/rss+xml; charset=utf-8');
 693
 694     // $usepermalink : If true, use permalink instead of final link.
 695     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=rss&permalinks
 696     // Also enabled through a config option
 697     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 698
 699     // Cache system
 700     $query = $_SERVER["QUERY_STRING"];
 701     $cache = new pageCache(pageUrl(),startsWith($query,'do=rss') && !isLoggedIn());
 702     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
 703
 704     // If cached was not found (or not usable), then read the database and build the response:
 705     $LINKSDB = new LinkDB(
 706         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 707         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 708     );
 709     // Read links from database (and filter private links if user it not logged in).
 710
 711     // Optionally filter the results:
 712     $linksToDisplay=array();
 713     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 714     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 715     else $linksToDisplay = $LINKSDB;
 716
 717     $nblinksToDisplay = 50;  // Number of links to display.
 718     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 719     {
 720         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 721     }
 722
 723     $pageaddr=htmlspecialchars(indexUrl());
 724     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 725     echo '<channel><title>'.htmlspecialchars($GLOBALS['title']).'</title><link>'.$pageaddr.'</link>';
 726     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 727     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 728     {
 729         echo '<!-- PubSubHubbub Discovery -->';
 730         echo '<link rel="hub" href="'.htmlspecialchars($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 731         echo '<link rel="self" href="'.htmlspecialchars($pageaddr).'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 732         echo '<!-- End Of PubSubHubbub Discovery -->';
 733     }
 734     $i=0;
 735     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 736     while ($i<$nblinksToDisplay && $i<count($keys))
 737     {
 738         $link = $linksToDisplay[$keys[$i]];
 739         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 740         $rfc822date = linkdate2rfc822($link['linkdate']);
 741         $absurl = htmlspecialchars($link['url']);
 742         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 743         if ($usepermalinks===true)
 744             echo '<item><title>'.htmlspecialchars($link['title']).'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 745         else
 746             echo '<item><title>'.htmlspecialchars($link['title']).'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 747         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.htmlspecialchars($rfc822date)."</pubDate>\n";
 748         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 749         {
 750             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.htmlspecialchars($pageaddr).'">'.htmlspecialchars($tag).'</category>'."\n"; }
 751         }
 752
 753         // Add permalink in description
 754         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 755         // If user wants permalinks first, put the final link in description
 756         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 757         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 758         echo '<description><![CDATA['.nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($link['description'])))).$descriptionlink.']]></description>'."\n</item>\n";
 759         $i++;
 760     }
 761     echo '</channel></rss><!-- Cached version of '.htmlspecialchars(pageUrl()).' -->';
 762
 763     $cache->cache(ob_get_contents());
 764     ob_end_flush();
 765     exit;
 766 }
 767
 768 // ------------------------------------------------------------------------------------------
 769 // Output the last N links in ATOM format.
 770 function showATOM()
 771 {
 772     header('Content-Type: application/atom+xml; charset=utf-8');
 773
 774     // $usepermalink : If true, use permalink instead of final link.
 775     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
 776     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 777
 778     // Cache system
 779     $query = $_SERVER["QUERY_STRING"];
 780     $cache = new pageCache(pageUrl(),startsWith($query,'do=atom') && !isLoggedIn());
 781     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
 782     // If cached was not found (or not usable), then read the database and build the response:
 783
 784     $LINKSDB = new LinkDB(
 785         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 786         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 787     );
 788
 789     // Optionally filter the results:
 790     $linksToDisplay=array();
 791     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 792     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 793     else $linksToDisplay = $LINKSDB;
 794
 795     $nblinksToDisplay = 50;  // Number of links to display.
 796     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 797     {
 798         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 799     }
 800
 801     $pageaddr=htmlspecialchars(indexUrl());
 802     $latestDate = '';
 803     $entries='';
 804     $i=0;
 805     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 806     while ($i<$nblinksToDisplay && $i<count($keys))
 807     {
 808         $link = $linksToDisplay[$keys[$i]];
 809         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 810         $iso8601date = linkdate2iso8601($link['linkdate']);
 811         $latestDate = max($latestDate,$iso8601date);
 812         $absurl = htmlspecialchars($link['url']);
 813         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 814         $entries.='<entry><title>'.htmlspecialchars($link['title']).'</title>';
 815         if ($usepermalinks===true)
 816             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
 817         else
 818             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
 819         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.htmlspecialchars($iso8601date).'</updated>';
 820
 821         // Add permalink in description
 822         $descriptionlink = htmlspecialchars('(<a href="'.$guid.'">Permalink</a>)');
 823         // If user wants permalinks first, put the final link in description
 824         if ($usepermalinks===true) $descriptionlink = htmlspecialchars('(<a href="'.$absurl.'">Link</a>)');
 825         if (strlen($link['description'])>0) $descriptionlink = '&lt;br&gt;'.$descriptionlink;
 826
 827         $entries.='<content type="html">'.htmlspecialchars(nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($link['description']))))).$descriptionlink."</content>\n";
 828         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
 829         {
 830             foreach(explode(' ',$link['tags']) as $tag)
 831                 { $entries.='<category scheme="'.htmlspecialchars($pageaddr,ENT_QUOTES).'" term="'.htmlspecialchars($tag,ENT_QUOTES).'" />'."\n"; }
 832         }
 833         $entries.="</entry>\n";
 834         $i++;
 835     }
 836     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
 837     $feed.='<title>'.htmlspecialchars($GLOBALS['title']).'</title>';
 838     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.htmlspecialchars($latestDate).'</updated>';
 839     $feed.='<link rel="self" href="'.htmlspecialchars(serverUrl().$_SERVER["REQUEST_URI"]).'" />';
 840     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 841     {
 842         $feed.='<!-- PubSubHubbub Discovery -->';
 843         $feed.='<link rel="hub" href="'.htmlspecialchars($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
 844         $feed.='<!-- End Of PubSubHubbub Discovery -->';
 845     }
 846     $feed.='<author><name>'.htmlspecialchars($pageaddr).'</name><uri>'.htmlspecialchars($pageaddr).'</uri></author>';
 847     $feed.='<id>'.htmlspecialchars($pageaddr).'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
 848     $feed.=$entries;
 849     $feed.='</feed><!-- Cached version of '.htmlspecialchars(pageUrl()).' -->';
 850     echo $feed;
 851
 852     $cache->cache(ob_get_contents());
 853     ob_end_flush();
 854     exit;
 855 }
 856
 857 // ------------------------------------------------------------------------------------------
 858 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 859 // Gives the last 7 days (which have links).
 860 // This RSS feed cannot be filtered.
 861 function showDailyRSS()
 862 {
 863     // Cache system
 864     $query = $_SERVER["QUERY_STRING"];
 865     $cache = new pageCache(pageUrl(),startsWith($query,'do=dailyrss') && !isLoggedIn());
 866     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
 867     // If cached was not found (or not usable), then read the database and build the response:
 868
 869     $LINKSDB = new LinkDB(
 870         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 871         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 872     );
 873
 874     /* Some Shaarlies may have very few links, so we need to look
 875        back in time (rsort()) until we have enough days ($nb_of_days).
 876     */
 877     $linkdates=array(); foreach($LINKSDB as $linkdate=>$value) { $linkdates[]=$linkdate; }
 878     rsort($linkdates);
 879     $nb_of_days=7; // We take 7 days.
 880     $today=Date('Ymd');
 881     $days=array();
 882     foreach($linkdates as $linkdate)
 883     {
 884         $day=substr($linkdate,0,8); // Extract day (without time)
 885         if (strcmp($day,$today)<0)
 886         {
 887             if (empty($days[$day])) $days[$day]=array();
 888             $days[$day][]=$linkdate;
 889         }
 890         if (count($days)>$nb_of_days) break; // Have we collected enough days?
 891     }
 892
 893     // Build the RSS feed.
 894     header('Content-Type: application/rss+xml; charset=utf-8');
 895     $pageaddr=htmlspecialchars(indexUrl());
 896     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 897     echo '<channel><title>Daily - '.htmlspecialchars($GLOBALS['title']).'</title><link>'.$pageaddr.'</link>';
 898     echo '<description>Daily shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n";
 899
 900     foreach($days as $day=>$linkdates) // For each day.
 901     {
 902         $daydate = utf8_encode(strftime('%A %d, %B %Y',linkdate2timestamp($day.'_000000'))); // Full text date
 903         $rfc822date = linkdate2rfc822($day.'_000000');
 904         $absurl=htmlspecialchars(indexUrl().'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 905         echo '<item><title>'.htmlspecialchars($GLOBALS['title'].' - '.$daydate).'</title><guid>'.$absurl.'</guid><link>'.$absurl.'</link>';
 906         echo '<pubDate>'.htmlspecialchars($rfc822date)."</pubDate>";
 907
 908         // Build the HTML body of this RSS entry.
 909         $html='';
 910         $href='';
 911         $links=array();
 912         // We pre-format some fields for proper output.
 913         foreach($linkdates as $linkdate)
 914         {
 915             $l = $LINKSDB[$linkdate];
 916             $l['formatedDescription']=nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($l['description']))));
 917             $l['thumbnail'] = thumbnail($l['url']);
 918             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
 919             if (startsWith($l['url'],'?')) $l['url']=indexUrl().$l['url'];  // make permalink URL absolute
 920             $links[$linkdate]=$l;
 921         }
 922         // Then build the HTML for this day:
 923         $tpl = new RainTPL;
 924         $tpl->assign('links',$links);
 925         $html = $tpl->draw('dailyrss',$return_string=true);
 926         echo "\n";
 927         echo '<description><![CDATA['.$html.']]></description>'."\n</item>\n\n";
 928
 929     }
 930     echo '</channel></rss><!-- Cached version of '.htmlspecialchars(pageUrl()).' -->';
 931
 932     $cache->cache(ob_get_contents());
 933     ob_end_flush();
 934     exit;
 935 }
 936
 937 // "Daily" page.
 938 function showDaily()
 939 {
 940     $LINKSDB = new LinkDB(
 941         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 942         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 943     );
 944
 945     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 946     if (isset($_GET['day'])) $day=$_GET['day'];
 947
 948     $days = $LINKSDB->days();
 949     $i = array_search($day,$days);
 950     if ($i==false) { $i=count($days)-1; $day=$days[$i]; }
 951     $previousday='';
 952     $nextday='';
 953     if ($i!==false)
 954     {
 955         if ($i>1) $previousday=$days[$i-1];
 956         if ($i<count($days)-1) $nextday=$days[$i+1];
 957     }
 958
 959     $linksToDisplay=$LINKSDB->filterDay($day);
 960     // We pre-format some fields for proper output.
 961     foreach($linksToDisplay as $key=>$link)
 962     {
 963         $taglist = explode(' ',$link['tags']);
 964         uasort($taglist, 'strcasecmp');
 965         $linksToDisplay[$key]['taglist']=$taglist;
 966         $linksToDisplay[$key]['formatedDescription']=nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($link['description']))));
 967         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
 968         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
 969     }
 970
 971     /* We need to spread the articles on 3 columns.
 972        I did not want to use a JavaScript lib like http://masonry.desandro.com/
 973        so I manually spread entries with a simple method: I roughly evaluate the
 974        height of a div according to title and description length.
 975     */
 976     $columns=array(array(),array(),array()); // Entries to display, for each column.
 977     $fill=array(0,0,0);  // Rough estimate of columns fill.
 978     foreach($linksToDisplay as $key=>$link)
 979     {
 980         // Roughly estimate length of entry (by counting characters)
 981         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
 982         // Description: 836 characters gives roughly 342 pixel height.
 983         // This is not perfect, but it's usually OK.
 984         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
 985         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
 986         // Then put in column which is the less filled:
 987         $smallest=min($fill); // find smallest value in array.
 988         $index=array_search($smallest,$fill); // find index of this smallest value.
 989         array_push($columns[$index],$link); // Put entry in this column.
 990         $fill[$index]+=$length;
 991     }
 992     $PAGE = new pageBuilder;
 993     $PAGE->assign('linksToDisplay',$linksToDisplay);
 994     $PAGE->assign('linkcount',count($LINKSDB));
 995     $PAGE->assign('cols', $columns);
 996     $PAGE->assign('day',linkdate2timestamp($day.'_000000'));
 997     $PAGE->assign('previousday',$previousday);
 998     $PAGE->assign('nextday',$nextday);
 999     $PAGE->renderPage('daily');
1000     exit;
1001 }
1002
1003
1004 // ------------------------------------------------------------------------------------------
1005 // Render HTML page (according to URL parameters and user rights)
1006 function renderPage()
1007 {
1008     $LINKSDB = new LinkDB(
1009         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
1010         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
1011     );
1012
1013     // -------- Display login form.
1014     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=login'))
1015     {
1016         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1017         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1018         $PAGE = new pageBuilder;
1019         $PAGE->assign('token',$token);
1020         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER']:''));
1021         $PAGE->renderPage('loginform');
1022         exit;
1023     }
1024     // -------- User wants to logout.
1025     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1026     {
1027         invalidateCaches();
1028         logout();
1029         header('Location: ?');
1030         exit;
1031     }
1032
1033     // -------- Picture wall
1034     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=picwall'))
1035     {
1036         // Optionally filter the results:
1037         $links=array();
1038         if (!empty($_GET['searchterm'])) $links = $LINKSDB->filterFulltext($_GET['searchterm']);
1039         elseif (!empty($_GET['searchtags']))   $links = $LINKSDB->filterTags(trim($_GET['searchtags']));
1040         else $links = $LINKSDB;
1041
1042         $body='';
1043         $linksToDisplay=array();
1044
1045         // Get only links which have a thumbnail.
1046         foreach($links as $link)
1047         {
1048             $permalink='?'.htmlspecialchars(smallhash($link['linkdate']),ENT_QUOTES);
1049             $thumb=lazyThumbnail($link['url'],$permalink);
1050             if ($thumb!='') // Only output links which have a thumbnail.
1051             {
1052                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1053                 $linksToDisplay[]=$link; // Add to array.
1054             }
1055         }
1056
1057         $PAGE = new pageBuilder;
1058         $PAGE->assign('linkcount',count($LINKSDB));
1059         $PAGE->assign('linksToDisplay',$linksToDisplay);
1060         $PAGE->renderPage('picwall');
1061         exit;
1062     }
1063
1064     // -------- Tag cloud
1065     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tagcloud'))
1066     {
1067         $tags= $LINKSDB->allTags();
1068
1069         // We sort tags alphabetically, then choose a font size according to count.
1070         // First, find max value.
1071         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1072         ksort($tags);
1073         $tagList=array();
1074         foreach($tags as $key=>$value)
1075         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1076         {
1077             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1078         }
1079         $PAGE = new pageBuilder;
1080         $PAGE->assign('linkcount',count($LINKSDB));
1081         $PAGE->assign('tags',$tagList);
1082         $PAGE->renderPage('tagcloud');
1083         exit;
1084     }
1085
1086     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1087     if (isset($_GET['addtag']))
1088     {
1089         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1090         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1091         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1092
1093         // Check if this tag is already in the search query and ignore it if it is.
1094         // Each tag is always separated by a space
1095         $current_tags = explode(' ', $params['searchtags']);
1096         $addtag = true;
1097         foreach ($current_tags as $value) {
1098             if ($value === $_GET['addtag']) {
1099                 $addtag = false;
1100                 break;
1101             }
1102         }
1103         // Append the tag if necessary
1104         if (empty($params['searchtags'])) {
1105             $params['searchtags'] = trim($_GET['addtag']);
1106         }
1107         else if ($addtag) {
1108             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1109         }
1110
1111         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1112         header('Location: ?'.http_build_query($params));
1113         exit;
1114     }
1115
1116     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1117     if (isset($_GET['removetag']))
1118     {
1119         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1120         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?'); exit; } // In case browser does not send HTTP_REFERER
1121         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1122         if (isset($params['searchtags']))
1123         {
1124             $tags = explode(' ',$params['searchtags']);
1125             $tags=array_diff($tags, array($_GET['removetag'])); // Remove value from array $tags.
1126             if (count($tags)==0) unset($params['searchtags']); else $params['searchtags'] = implode(' ',$tags);
1127             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1128         }
1129         header('Location: ?'.http_build_query($params));
1130         exit;
1131     }
1132
1133     // -------- User wants to change the number of links per page (linksperpage=...)
1134     if (isset($_GET['linksperpage']))
1135     {
1136         if (is_numeric($_GET['linksperpage'])) { $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage'])); }
1137         // Make sure the referrer is Shaarli itself.
1138         $referer = '?';
1139         if (!empty($_SERVER['HTTP_REFERER']) && strcmp(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST),$_SERVER['HTTP_HOST'])==0)
1140             $referer = $_SERVER['HTTP_REFERER'];
1141         header('Location: '.$referer);
1142         exit;
1143     }
1144
1145     // -------- User wants to see only private links (toggle)
1146     if (isset($_GET['privateonly']))
1147     {
1148         if (empty($_SESSION['privateonly']))
1149         {
1150             $_SESSION['privateonly']=1; // See only private links
1151         }
1152         else
1153         {
1154             unset($_SESSION['privateonly']); // See all links
1155         }
1156         // Make sure the referrer is Shaarli itself.
1157         $referer = '?';
1158         if (!empty($_SERVER['HTTP_REFERER']) && strcmp(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST),$_SERVER['HTTP_HOST'])==0)
1159             $referer = $_SERVER['HTTP_REFERER'];
1160         header('Location: '.$referer);
1161         exit;
1162     }
1163
1164     // -------- Handle other actions allowed for non-logged in users:
1165     if (!isLoggedIn())
1166     {
1167         // User tries to post new link but is not logged in:
1168         // Show login screen, then redirect to ?post=...
1169         if (isset($_GET['post']))
1170         {
1171             header('Location: ?do=login&post='.urlencode($_GET['post']).(!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').(!empty($_GET['description'])?'&description='.urlencode($_GET['description']):'').(!empty($_GET['source'])?'&source='.urlencode($_GET['source']):'')); // Redirect to login page, then back to post link.
1172             exit;
1173         }
1174
1175                 // Same case as above except that user tried to access ?do=addlink without being logged in
1176                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1177                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1178                         header('Location: ?do=login&post=');
1179                         exit;
1180                 }
1181
1182         $PAGE = new pageBuilder;
1183         buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1184         $PAGE->renderPage('linklist');
1185         exit; // Never remove this one! All operations below are reserved for logged in user.
1186     }
1187
1188     // -------- All other functions are reserved for the registered user:
1189
1190     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1191     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tools'))
1192     {
1193         $PAGE = new pageBuilder;
1194         $PAGE->assign('linkcount',count($LINKSDB));
1195         $PAGE->assign('pageabsaddr',indexUrl());
1196         $PAGE->renderPage('tools');
1197         exit;
1198     }
1199
1200     // -------- User wants to change his/her password.
1201     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changepasswd'))
1202     {
1203         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1204         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1205         {
1206             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1207
1208             // Make sure old password is correct.
1209             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1210             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1211             // Save new password
1212             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1213             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1214             writeConfig();
1215             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1216             exit;
1217         }
1218         else // show the change password form.
1219         {
1220             $PAGE = new pageBuilder;
1221             $PAGE->assign('linkcount',count($LINKSDB));
1222             $PAGE->assign('token',getToken());
1223             $PAGE->renderPage('changepassword');
1224             exit;
1225         }
1226     }
1227
1228     // -------- User wants to change configuration
1229     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=configure'))
1230     {
1231         if (!empty($_POST['title']) )
1232         {
1233             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1234             $tz = 'UTC';
1235             if (!empty($_POST['continent']) && !empty($_POST['city']))
1236                 if (isTZvalid($_POST['continent'],$_POST['city']))
1237                     $tz = $_POST['continent'].'/'.$_POST['city'];
1238             $GLOBALS['timezone'] = $tz;
1239             $GLOBALS['title']=$_POST['title'];
1240             $GLOBALS['titleLink']=$_POST['titleLink'];
1241             $GLOBALS['redirector']=$_POST['redirector'];
1242             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1243             $GLOBALS['disablejquery']=!empty($_POST['disablejquery']);
1244             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1245             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1246             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1247             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1248             writeConfig();
1249             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1250             exit;
1251         }
1252         else // Show the configuration form.
1253         {
1254             $PAGE = new pageBuilder;
1255             $PAGE->assign('linkcount',count($LINKSDB));
1256             $PAGE->assign('token',getToken());
1257             $PAGE->assign('title',htmlspecialchars( empty($GLOBALS['title']) ? '' : $GLOBALS['title'] , ENT_QUOTES));
1258             $PAGE->assign('redirector',htmlspecialchars( empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] , ENT_QUOTES));
1259             list($timezone_form,$timezone_js) = templateTZform($GLOBALS['timezone']);
1260             $PAGE->assign('timezone_form',$timezone_form); // FIXME: Put entire tz form generation in template?
1261             $PAGE->assign('timezone_js',$timezone_js);
1262             $PAGE->renderPage('configure');
1263             exit;
1264         }
1265     }
1266
1267     // -------- User wants to rename a tag or delete it
1268     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changetag'))
1269     {
1270         if (empty($_POST['fromtag']))
1271         {
1272             $PAGE = new pageBuilder;
1273             $PAGE->assign('linkcount',count($LINKSDB));
1274             $PAGE->assign('token',getToken());
1275             $PAGE->assign('tags', $LINKSDB->allTags());
1276             $PAGE->renderPage('changetag');
1277             exit;
1278         }
1279         if (!tokenOk($_POST['token'])) die('Wrong token.');
1280
1281         // Delete a tag:
1282         if (!empty($_POST['deletetag']) && !empty($_POST['fromtag']))
1283         {
1284             $needle=trim($_POST['fromtag']);
1285             $linksToAlter = $LINKSDB->filterTags($needle,true); // True for case-sensitive tag search.
1286             foreach($linksToAlter as $key=>$value)
1287             {
1288                 $tags = explode(' ',trim($value['tags']));
1289                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1290                 $value['tags']=trim(implode(' ',$tags));
1291                 $LINKSDB[$key]=$value;
1292             }
1293             $LINKSDB->savedb(); // Save to disk.
1294             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1295             exit;
1296         }
1297
1298         // Rename a tag:
1299         if (!empty($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag']))
1300         {
1301             $needle=trim($_POST['fromtag']);
1302             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
1303             foreach($linksToAlter as $key=>$value)
1304             {
1305                 $tags = explode(' ',trim($value['tags']));
1306                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1307                 $value['tags']=trim(implode(' ',$tags));
1308                 $LINKSDB[$key]=$value;
1309             }
1310             $LINKSDB->savedb(); // Save to disk.
1311             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1312             exit;
1313         }
1314     }
1315
1316     // -------- User wants to add a link without using the bookmarklet: Show form.
1317     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=addlink'))
1318     {
1319         $PAGE = new pageBuilder;
1320         $PAGE->assign('linkcount',count($LINKSDB));
1321         $PAGE->renderPage('addlink');
1322         exit;
1323     }
1324
1325     // -------- User clicked the "Save" button when editing a link: Save link to database.
1326     if (isset($_POST['save_edit']))
1327     {
1328         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1329         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1330         $linkdate=$_POST['lf_linkdate'];
1331         $url = trim($_POST['lf_url']);
1332         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?') && !startsWith($url,'javascript:'))
1333             $url = 'http://'.$url;
1334         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1335                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1336         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1337         $LINKSDB[$linkdate] = $link;
1338         $LINKSDB->savedb(); // Save to disk.
1339         pubsubhub();
1340
1341         // If we are called from the bookmarklet, we must close the popup:
1342         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1343         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1344         $returnurl .= '#'.smallHash($linkdate);  // Scroll to the link which has been edited.
1345         if (strstr($returnurl, "do=addlink")) { $returnurl = '?'; } //if we come from ?do=addlink, set returnurl to homepage instead
1346         header('Location: '.$returnurl); // After saving the link, redirect to the page the user was on.
1347         exit;
1348     }
1349
1350     // -------- User clicked the "Cancel" button when editing a link.
1351     if (isset($_POST['cancel_edit']))
1352     {
1353         // If we are called from the bookmarklet, we must close the popup:
1354         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1355         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1356         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1357         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1358         exit;
1359     }
1360
1361     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1362     if (isset($_POST['delete_link']))
1363     {
1364         if (!tokenOk($_POST['token'])) die('Wrong token.');
1365         // We do not need to ask for confirmation:
1366         // - confirmation is handled by JavaScript
1367         // - we are protected from XSRF by the token.
1368         $linkdate=$_POST['lf_linkdate'];
1369         unset($LINKSDB[$linkdate]);
1370         $LINKSDB->savedb(); // save to disk
1371
1372         // If we are called from the bookmarklet, we must close the popup:
1373         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1374         // Pick where we're going to redirect
1375         // =============================================================
1376         // Basically, we can't redirect to where we were previously if it was a permalink
1377         // or an edit_link, because it would 404.
1378         // Cases:
1379         //    - /             : nothing in $_GET, redirect to self
1380         //    - /?page        : redirect to self
1381         //    - /?searchterm  : redirect to self (there might be other links)
1382         //    - /?searchtags  : redirect to self
1383         //    - /permalink    : redirect to / (the link does not exist anymore)
1384         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1385         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1386         // redirect is not satisfied, and only then redirect to /
1387         $location = "?";
1388         // Self redirection
1389         if (count($_GET) == 0    ||
1390             isset($_GET['page']) ||
1391             isset($_GET['searchterm']) ||
1392             isset($_GET['searchtags'])) {
1393
1394             if (isset($_POST['returnurl'])) {
1395                 $location = $_POST['returnurl']; // Handle redirects given by the form
1396             }
1397
1398             if ($location === "?" &&
1399                 isset($_SERVER['HTTP_REFERER'])) { // Handle HTTP_REFERER in case we're not coming from the same place.
1400                 $location = $_SERVER['HTTP_REFERER'];
1401             }
1402         }
1403
1404         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1405         exit;
1406     }
1407
1408     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1409     if (isset($_GET['edit_link']))
1410     {
1411         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1412         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1413         $PAGE = new pageBuilder;
1414         $PAGE->assign('linkcount',count($LINKSDB));
1415         $PAGE->assign('link',$link);
1416         $PAGE->assign('link_is_new',false);
1417         $PAGE->assign('token',getToken()); // XSRF protection.
1418         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : ''));
1419         $PAGE->assign('tags', $LINKSDB->allTags());
1420         $PAGE->renderPage('editlink');
1421         exit;
1422     }
1423
1424     // -------- User want to post a new link: Display link edit form.
1425     if (isset($_GET['post']))
1426     {
1427         $url=$_GET['post'];
1428
1429
1430         // We remove the annoying parameters added by FeedBurner, GoogleFeedProxy, Facebook...
1431         $annoyingpatterns = array('/[\?&]utm_source=[^&]*/',
1432             '/[\?&]utm_campaign=[^&]*/',
1433             '/[\?&]utm_medium=[^&]*/',
1434             '/#xtor=RSS-[^&]*/',
1435             '/[\?&]fb_[^&]*/',
1436             '/[\?&]__scoop[^&]*/',
1437             '/#tk\.rss_all\?/',
1438             '/[\?&]action_ref_map=[^&]*/',
1439             '/[\?&]action_type_map=[^&]*/',
1440             '/[\?&]action_object_map=[^&]*/',
1441             '/[\?&]utm_content=[^&]*/',
1442             '/[\?&]fb=[^&]*/',
1443             '/[\?&]xtor=[^&]*/'
1444             );
1445         foreach($annoyingpatterns as $pattern)
1446         {
1447             $url = preg_replace($pattern, "", $url);
1448         }
1449
1450         $link_is_new = false;
1451         $link = $LINKSDB->getLinkFromUrl($url); // Check if URL is not already in database (in this case, we will edit the existing link)
1452         if (!$link)
1453         {
1454             $link_is_new = true;  // This is a new link
1455             $linkdate = strval(date('Ymd_His'));
1456             $title = (empty($_GET['title']) ? '' : $_GET['title'] ); // Get title if it was provided in URL (by the bookmarklet).
1457             $description = (empty($_GET['description']) ? '' : $_GET['description']); // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1458             $tags = (empty($_GET['tags']) ? '' : $_GET['tags'] ); // Get tags if it was provided in URL
1459             $private = (!empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0); // Get private if it was provided in URL
1460             if (($url!='') && parse_url($url,PHP_URL_SCHEME)=='') $url = 'http://'.$url;
1461             // 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.)
1462             if (empty($title) && parse_url($url,PHP_URL_SCHEME)=='http')
1463             {
1464                 list($status,$headers,$data) = getHTTP($url,4); // Short timeout to keep the application responsive.
1465                 // FIXME: Decode charset according to specified in either 1) HTTP response headers or 2) <head> in html
1466                 if (strpos($status,'200 OK')!==false)
1467                                          {
1468                         // Look for charset in html header.
1469                                                 preg_match('#<meta .*charset=.*>#Usi', $data, $meta);
1470
1471                                                 // If found, extract encoding.
1472                                                 if (!empty($meta[0]))
1473                                                 {
1474                                                         // Get encoding specified in header.
1475                                                         preg_match('#charset="?(.*)"#si', $meta[0], $enc);
1476                                                         // If charset not found, use utf-8.
1477                                                         $html_charset = (!empty($enc[1])) ? strtolower($enc[1]) : 'utf-8';
1478                                                 }
1479                                                 else { $html_charset = 'utf-8'; }
1480
1481                                                 // Extract title
1482                                                 $title = html_extract_title($data);
1483                                                 if (!empty($title))
1484                                                 {
1485                                                         // Re-encode title in utf-8 if necessary.
1486                                                         $title = ($html_charset == 'iso-8859-1') ? utf8_encode($title) : $title;
1487                                                 }
1488                                         }
1489             }
1490             if ($url=='') // In case of empty URL, this is just a text (with a link that points to itself)
1491             {
1492                 $url='?'.smallHash($linkdate);
1493                 $title='Note: ';
1494             }
1495             $link = array('linkdate'=>$linkdate,'title'=>$title,'url'=>$url,'description'=>$description,'tags'=>$tags,'private'=>$private);
1496         }
1497
1498         $PAGE = new pageBuilder;
1499         $PAGE->assign('linkcount',count($LINKSDB));
1500         $PAGE->assign('link',$link);
1501         $PAGE->assign('link_is_new',$link_is_new);
1502         $PAGE->assign('token',getToken()); // XSRF protection.
1503         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : ''));
1504         $PAGE->assign('source',(isset($_GET['source']) ? $_GET['source'] : ''));
1505         $PAGE->assign('tags', $LINKSDB->allTags());
1506         $PAGE->renderPage('editlink');
1507         exit;
1508     }
1509
1510     // -------- Export as Netscape Bookmarks HTML file.
1511     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=export'))
1512     {
1513         if (empty($_GET['what']))
1514         {
1515             $PAGE = new pageBuilder;
1516             $PAGE->assign('linkcount',count($LINKSDB));
1517             $PAGE->renderPage('export');
1518             exit;
1519         }
1520         $exportWhat=$_GET['what'];
1521         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1522
1523         header('Content-Type: text/html; charset=utf-8');
1524         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1525         $currentdate=date('Y/m/d H:i:s');
1526         echo <<<HTML
1527 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1528 <!-- This is an automatically generated file.
1529      It will be read and overwritten.
1530      DO NOT EDIT! -->
1531 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1532 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1533 <TITLE>Bookmarks</TITLE>
1534 <H1>Bookmarks</H1>
1535 HTML;
1536         foreach($LINKSDB as $link)
1537         {
1538             if ($exportWhat=='all' ||
1539                ($exportWhat=='private' && $link['private']!=0) ||
1540                ($exportWhat=='public' && $link['private']==0))
1541             {
1542                 echo '<DT><A HREF="'.htmlspecialchars($link['url']).'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1543                 if ($link['tags']!='') echo ' TAGS="'.htmlspecialchars(str_replace(' ',',',$link['tags'])).'"';
1544                 echo '>'.htmlspecialchars($link['title'])."</A>\n";
1545                 if ($link['description']!='') echo '<DD>'.htmlspecialchars($link['description'])."\n";
1546             }
1547         }
1548                 exit;
1549     }
1550
1551     // -------- User is uploading a file for import
1552     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1553     {
1554         // If file is too big, some form field may be missing.
1555         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1556         {
1557             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1558             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.htmlspecialchars($returnurl).'\';</script>';
1559             exit;
1560         }
1561         if (!tokenOk($_POST['token'])) die('Wrong token.');
1562         importFile();
1563         exit;
1564     }
1565
1566     // -------- Show upload/import dialog:
1567     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=import'))
1568     {
1569         $PAGE = new pageBuilder;
1570         $PAGE->assign('linkcount',count($LINKSDB));
1571         $PAGE->assign('token',getToken());
1572         $PAGE->assign('maxfilesize',getMaxFileSize());
1573         $PAGE->renderPage('import');
1574         exit;
1575     }
1576
1577     // -------- Otherwise, simply display search form and links:
1578     $PAGE = new pageBuilder;
1579     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1580     $PAGE->renderPage('linklist');
1581     exit;
1582 }
1583
1584 // -----------------------------------------------------------------------------------------------
1585 // Process the import file form.
1586 function importFile()
1587 {
1588     if (!(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'])) { die('Not allowed.'); }
1589     $LINKSDB = new LinkDB(
1590         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
1591         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
1592     );
1593     $filename=$_FILES['filetoupload']['name'];
1594     $filesize=$_FILES['filetoupload']['size'];
1595     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1596     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1597     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1598     $import_count=0;
1599
1600     // Sniff file type:
1601     $type='unknown';
1602     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1603
1604     // Then import the bookmarks.
1605     if ($type=='netscape')
1606     {
1607         // This is a standard Netscape-style bookmark file.
1608         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1609         foreach(explode('<DT>',$data) as $html) // explode is very fast
1610         {
1611             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1612             $d = explode('<DD>',$html);
1613             if (startswith($d[0],'<A '))
1614             {
1615                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1616                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1617                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1618                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1619                 $raw_add_date=0;
1620                 foreach($matches as $m)
1621                 {
1622                     $attr=$m[1]; $value=$m[2];
1623                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1624                     elseif ($attr=='ADD_DATE')
1625                     {
1626                         $raw_add_date=intval($value);
1627                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1628                     }
1629                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1630                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1631                 }
1632                 if ($link['url']!='')
1633                 {
1634                     if ($private==1) $link['private']=1;
1635                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1636                     if ($dblink==false)
1637                     {  // Link not in database, let's import it...
1638                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1639
1640                        // Make sure date/time is not already used by another link.
1641                        // (Some bookmark files have several different links with the same ADD_DATE)
1642                        // We increment date by 1 second until we find a date which is not used in DB.
1643                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1644                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1645                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1646                        $LINKSDB[$link['linkdate']] = $link;
1647                        $import_count++;
1648                     }
1649                     else // Link already present in database.
1650                     {
1651                         if ($overwrite)
1652                         {   // If overwrite is required, we import link data, except date/time.
1653                             $link['linkdate']=$dblink['linkdate'];
1654                             $LINKSDB[$link['linkdate']] = $link;
1655                             $import_count++;
1656                         }
1657                     }
1658
1659                 }
1660             }
1661         }
1662         $LINKSDB->savedb();
1663
1664         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1665     }
1666     else
1667     {
1668         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1669     }
1670 }
1671
1672 // -----------------------------------------------------------------------------------------------
1673 // Template for the list of links (<div id="linklist">)
1674 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1675 function buildLinkList($PAGE,$LINKSDB)
1676 {
1677     // ---- Filter link database according to parameters
1678     $linksToDisplay=array();
1679     $search_type='';
1680     $search_crits='';
1681     if (isset($_GET['searchterm'])) // Fulltext search
1682     {
1683         $linksToDisplay = $LINKSDB->filterFulltext(trim($_GET['searchterm']));
1684         $search_crits=htmlspecialchars(trim($_GET['searchterm']));
1685         $search_type='fulltext';
1686     }
1687     elseif (isset($_GET['searchtags'])) // Search by tag
1688     {
1689         $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
1690         $search_crits=explode(' ',trim($_GET['searchtags']));
1691         $search_type='tags';
1692     }
1693     elseif (isset($_SERVER['QUERY_STRING']) && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/',$_SERVER['QUERY_STRING'])) // Detect smallHashes in URL
1694     {
1695         $linksToDisplay = $LINKSDB->filterSmallHash(substr(trim($_SERVER["QUERY_STRING"], '/'),0,6));
1696         if (count($linksToDisplay)==0)
1697         {
1698             header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
1699             echo '<h1>404 Not found.</h1>Oh crap. The link you are trying to reach does not exist or has been deleted.';
1700             echo '<br>You would mind <a href="?">clicking here</a>?';
1701             exit;
1702         }
1703         $search_type='permalink';
1704     }
1705     else
1706         $linksToDisplay = $LINKSDB;  // Otherwise, display without filtering.
1707
1708
1709     // Option: Show only private links
1710     if (!empty($_SESSION['privateonly']))
1711     {
1712         $tmp = array();
1713         foreach($linksToDisplay as $linkdate=>$link)
1714         {
1715             if ($link['private']!=0) $tmp[$linkdate]=$link;
1716         }
1717         $linksToDisplay=$tmp;
1718     }
1719
1720     // ---- Handle paging.
1721     /* Can someone explain to me why you get the following error when using array_keys() on an object which implements the interface ArrayAccess???
1722        "Warning: array_keys() expects parameter 1 to be array, object given in ... "
1723        If my class implements ArrayAccess, why won't array_keys() accept it ?  ( $keys=array_keys($linksToDisplay); )
1724     */
1725     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; } // Stupid and ugly. Thanks PHP.
1726
1727     // If it's a permalink, we change on-the-fly the title of the page.
1728     if(!empty($search_type && $search_type == 'permalink')) {
1729         $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'] . ' - ' . $GLOBALS['title'];
1730     }
1731
1732     // Select articles according to paging.
1733     $pagecount = ceil(count($keys)/$_SESSION['LINKS_PER_PAGE']);
1734     $pagecount = ($pagecount==0 ? 1 : $pagecount);
1735     $page=( empty($_GET['page']) ? 1 : intval($_GET['page']));
1736     $page = ( $page<1 ? 1 : $page );
1737     $page = ( $page>$pagecount ? $pagecount : $page );
1738     $i = ($page-1)*$_SESSION['LINKS_PER_PAGE']; // Start index.
1739     $end = $i+$_SESSION['LINKS_PER_PAGE'];
1740     $linkDisp=array(); // Links to display
1741     while ($i<$end && $i<count($keys))
1742     {
1743         $link = $linksToDisplay[$keys[$i]];
1744         $link['description']=nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($link['description']))));
1745         $title=$link['title'];
1746         $classLi =  $i%2!=0 ? '' : 'publicLinkHightLight';
1747         $link['class'] = ($link['private']==0 ? $classLi : 'private');
1748         $link['timestamp']=linkdate2timestamp($link['linkdate']);
1749         $taglist = explode(' ',$link['tags']);
1750         uasort($taglist, 'strcasecmp');
1751         $link['taglist']=$taglist;
1752
1753         if ($link["url"][0] === '?' && // Check for both signs of a note: starting with ? and 7 chars long. I doubt that you'll post any links that look like this.
1754             strlen($link["url"]) === 7) {
1755             $link["url"] = indexUrl() . $link["url"];
1756         }
1757
1758         $linkDisp[$keys[$i]] = $link;
1759         $i++;
1760     }
1761
1762     // Compute paging navigation
1763     $searchterm= ( empty($_GET['searchterm']) ? '' : '&searchterm='.$_GET['searchterm'] );
1764     $searchtags= ( empty($_GET['searchtags']) ? '' : '&searchtags='.$_GET['searchtags'] );
1765     $paging='';
1766     $previous_page_url=''; if ($i!=count($keys)) $previous_page_url='?page='.($page+1).$searchterm.$searchtags;
1767     $next_page_url='';if ($page>1) $next_page_url='?page='.($page-1).$searchterm.$searchtags;
1768
1769     $token = ''; if (isLoggedIn()) $token=getToken();
1770
1771     // Fill all template fields.
1772     $PAGE->assign('linkcount',count($LINKSDB));
1773     $PAGE->assign('previous_page_url',$previous_page_url);
1774     $PAGE->assign('next_page_url',$next_page_url);
1775     $PAGE->assign('page_current',$page);
1776     $PAGE->assign('page_max',$pagecount);
1777     $PAGE->assign('result_count',count($linksToDisplay));
1778     $PAGE->assign('search_type',$search_type);
1779     $PAGE->assign('search_crits',$search_crits);
1780     $PAGE->assign('redirector',empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector']); // Optional redirector URL.
1781     $PAGE->assign('token',$token);
1782     $PAGE->assign('links',$linkDisp);
1783     $PAGE->assign('tags', $LINKSDB->allTags());
1784     return;
1785 }
1786
1787 // Compute the thumbnail for a link.
1788 //
1789 // With a link to the original URL.
1790 // Understands various services (youtube.com...)
1791 // Input: $url = URL for which the thumbnail must be found.
1792 //        $href = if provided, this URL will be followed instead of $url
1793 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1794 // Some of them may be missing.
1795 // Return an empty array if no thumbnail available.
1796 function computeThumbnail($url,$href=false)
1797 {
1798     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
1799     if ($href==false) $href=$url;
1800
1801     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1802     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1803     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1804     $domain = parse_url($url,PHP_URL_HOST);
1805     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1806     {
1807         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1808         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1809                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1810     }
1811     if ($domain=='youtu.be') // Youtube short links
1812     {
1813         $path = parse_url($url,PHP_URL_PATH);
1814         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1815                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1816     }
1817     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1818     {
1819         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1820         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1821                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1822     }
1823
1824     if ($domain=='imgur.com')
1825     {
1826         $path = parse_url($url,PHP_URL_PATH);
1827         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1828         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1829                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1830         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1831                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1832
1833         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1834                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1835     }
1836     if ($domain=='i.imgur.com')
1837     {
1838         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1839         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1840                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1841     }
1842     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1843     {
1844         if (strpos($url,'dailymotion.com/video/')!==false)
1845         {
1846             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1847             return array('src'=>$thumburl,
1848                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1849         }
1850     }
1851     if (endsWith($domain,'.imageshack.us'))
1852     {
1853         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1854         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1855         {
1856             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1857             return array('src'=>$thumburl,
1858                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1859         }
1860     }
1861
1862     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1863     // So we deport the thumbnail generation in order not to slow down page generation
1864     // (and we also cache the thumbnail)
1865
1866     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1867
1868     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1869         || $domain=='vimeo.com'
1870         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1871         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1872     )
1873     {
1874         if ($domain=='vimeo.com')
1875         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1876             $path = parse_url($url,PHP_URL_PATH);
1877             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1878         }
1879         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
1880         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
1881             $path = parse_url($url,PHP_URL_PATH);
1882             if (!preg_match('!/\d+.+?!',$path)) return array();
1883         }
1884         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
1885         {   // Make sure this TED URL points to a video (/talks/...)
1886             $path = parse_url($url,PHP_URL_PATH);
1887             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
1888         }
1889         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1890         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.htmlspecialchars($sign).'&url='.urlencode($url),
1891                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1892     }
1893
1894     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1895     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1896     // But using the extension will do.
1897     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1898     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1899     {
1900         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1901         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.htmlspecialchars($sign).'&url='.urlencode($url),
1902                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1903     }
1904     return array(); // No thumbnail.
1905
1906 }
1907
1908
1909 // Returns the HTML code to display a thumbnail for a link
1910 // with a link to the original URL.
1911 // Understands various services (youtube.com...)
1912 // Input: $url = URL for which the thumbnail must be found.
1913 //        $href = if provided, this URL will be followed instead of $url
1914 // Returns '' if no thumbnail available.
1915 function thumbnail($url,$href=false)
1916 {
1917     $t = computeThumbnail($url,$href);
1918     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1919
1920     $html='<a href="'.htmlspecialchars($t['href']).'"><img src="'.htmlspecialchars($t['src']).'"';
1921     if (!empty($t['width']))  $html.=' width="'.htmlspecialchars($t['width']).'"';
1922     if (!empty($t['height'])) $html.=' height="'.htmlspecialchars($t['height']).'"';
1923     if (!empty($t['style']))  $html.=' style="'.htmlspecialchars($t['style']).'"';
1924     if (!empty($t['alt']))    $html.=' alt="'.htmlspecialchars($t['alt']).'"';
1925     $html.='></a>';
1926     return $html;
1927 }
1928
1929 // Returns the HTML code to display a thumbnail for a link
1930 // for the picture wall (using lazy image loading)
1931 // Understands various services (youtube.com...)
1932 // Input: $url = URL for which the thumbnail must be found.
1933 //        $href = if provided, this URL will be followed instead of $url
1934 // Returns '' if no thumbnail available.
1935 function lazyThumbnail($url,$href=false)
1936 {
1937     $t = computeThumbnail($url,$href);
1938     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1939
1940     $html='<a href="'.htmlspecialchars($t['href']).'">';
1941
1942     // Lazy image
1943     $html.='<img class="b-lazy" src="#" data-src="'.htmlspecialchars($t['src']).'"';
1944
1945     if (!empty($t['width']))  $html.=' width="'.htmlspecialchars($t['width']).'"';
1946     if (!empty($t['height'])) $html.=' height="'.htmlspecialchars($t['height']).'"';
1947     if (!empty($t['style']))  $html.=' style="'.htmlspecialchars($t['style']).'"';
1948     if (!empty($t['alt']))    $html.=' alt="'.htmlspecialchars($t['alt']).'"';
1949     $html.='>';
1950
1951     // No-JavaScript fallback.
1952     $html.='<noscript><img src="'.htmlspecialchars($t['src']).'"';
1953     if (!empty($t['width']))  $html.=' width="'.htmlspecialchars($t['width']).'"';
1954     if (!empty($t['height'])) $html.=' height="'.htmlspecialchars($t['height']).'"';
1955     if (!empty($t['style']))  $html.=' style="'.htmlspecialchars($t['style']).'"';
1956     if (!empty($t['alt']))    $html.=' alt="'.htmlspecialchars($t['alt']).'"';
1957     $html.='></noscript></a>';
1958
1959     return $html;
1960 }
1961
1962
1963 // -----------------------------------------------------------------------------------------------
1964 // Installation
1965 // This function should NEVER be called if the file data/config.php exists.
1966 function install()
1967 {
1968     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
1969     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
1970
1971
1972     // This part makes sure sessions works correctly.
1973     // (Because on some hosts, session.save_path may not be set correctly,
1974     // or we may not have write access to it.)
1975     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
1976     {   // Step 2: Check if data in session is correct.
1977         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
1978         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
1979         echo 'It currently points to '.session_save_path().'<br>';
1980         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
1981         echo '<br><a href="?">Click to try again.</a></pre>';
1982         die;
1983     }
1984     if (!isset($_SESSION['session_tested']))
1985     {   // Step 1 : Try to store data in session and reload page.
1986         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
1987         header('Location: '.indexUrl().'?test_session');  // Redirect to check stored data.
1988     }
1989     if (isset($_GET['test_session']))
1990     {   // Step 3: Sessions are OK. Remove test parameter from URL.
1991         header('Location: '.indexUrl());
1992     }
1993
1994
1995     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
1996     {
1997         $tz = 'UTC';
1998         if (!empty($_POST['continent']) && !empty($_POST['city']))
1999             if (isTZvalid($_POST['continent'],$_POST['city']))
2000                 $tz = $_POST['continent'].'/'.$_POST['city'];
2001         $GLOBALS['timezone'] = $tz;
2002         // Everything is ok, let's create config file.
2003         $GLOBALS['login'] = $_POST['setlogin'];
2004         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2005         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2006         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.htmlspecialchars(indexUrl()) : $_POST['title'] );
2007         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2008         writeConfig();
2009         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2010         exit;
2011     }
2012
2013     // Display config form:
2014     list($timezone_form,$timezone_js) = templateTZform();
2015     $timezone_html=''; if ($timezone_form!='') $timezone_html='<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2016
2017     $PAGE = new pageBuilder;
2018     $PAGE->assign('timezone_html',$timezone_html);
2019     $PAGE->assign('timezone_js',$timezone_js);
2020     $PAGE->renderPage('install');
2021     exit;
2022 }
2023
2024 // Generates the timezone selection form and JavaScript.
2025 // Input: (optional) current timezone (can be 'UTC/UTC'). It will be pre-selected.
2026 // Output: array(html,js)
2027 // Example: list($htmlform,$js) = templateTZform('Europe/Paris');  // Europe/Paris pre-selected.
2028 // Returns array('','') if server does not support timezones list. (e.g. PHP 5.1 on free.fr)
2029 function templateTZform($ptz=false)
2030 {
2031     if (function_exists('timezone_identifiers_list')) // because of old PHP version (5.1) which can be found on free.fr
2032     {
2033         // Try to split the provided timezone.
2034         if ($ptz==false) { $l=timezone_identifiers_list(); $ptz=$l[0]; }
2035         $spos=strpos($ptz,'/'); $pcontinent=substr($ptz,0,$spos); $pcity=substr($ptz,$spos+1);
2036
2037         // Display config form:
2038         $timezone_form = '';
2039         $timezone_js = '';
2040         // The list is in the form "Europe/Paris", "America/Argentina/Buenos_Aires"...
2041         // We split the list in continents/cities.
2042         $continents = array();
2043         $cities = array();
2044         foreach(timezone_identifiers_list() as $tz)
2045         {
2046             if ($tz=='UTC') $tz='UTC/UTC';
2047             $spos = strpos($tz,'/');
2048             if ($spos!==false)
2049             {
2050                 $continent=substr($tz,0,$spos); $city=substr($tz,$spos+1);
2051                 $continents[$continent]=1;
2052                 if (!isset($cities[$continent])) $cities[$continent]='';
2053                 $cities[$continent].='<option value="'.$city.'"'.($pcity==$city?' selected':'').'>'.$city.'</option>';
2054             }
2055         }
2056         $continents_html = '';
2057         $continents = array_keys($continents);
2058         foreach($continents as $continent)
2059             $continents_html.='<option  value="'.$continent.'"'.($pcontinent==$continent?' selected':'').'>'.$continent.'</option>';
2060         $cities_html = $cities[$pcontinent];
2061         $timezone_form = "Continent: <select name=\"continent\" id=\"continent\" onChange=\"onChangecontinent();\">${continents_html}</select>";
2062         $timezone_form .= "&nbsp;&nbsp;&nbsp;&nbsp;City: <select name=\"city\" id=\"city\">${cities[$pcontinent]}</select><br />";
2063         $timezone_js = "<script>";
2064         $timezone_js .= "function onChangecontinent(){document.getElementById(\"city\").innerHTML = citiescontinent[document.getElementById(\"continent\").value];}";
2065         $timezone_js .= "var citiescontinent = ".json_encode($cities).";" ;
2066         $timezone_js .= "</script>" ;
2067         return array($timezone_form,$timezone_js);
2068     }
2069     return array('','');
2070 }
2071
2072 // Tells if a timezone is valid or not.
2073 // If not valid, returns false.
2074 // If system does not support timezone list, returns false.
2075 function isTZvalid($continent,$city)
2076 {
2077     $tz = $continent.'/'.$city;
2078     if (function_exists('timezone_identifiers_list')) // because of old PHP version (5.1) which can be found on free.fr
2079     {
2080         if (in_array($tz, timezone_identifiers_list())) // it's a valid timezone?
2081                     return true;
2082     }
2083     return false;
2084 }
2085 if (!function_exists('json_encode')) {
2086     function json_encode($data) {
2087         switch ($type = gettype($data)) {
2088             case 'NULL':
2089                 return 'null';
2090             case 'boolean':
2091                 return ($data ? 'true' : 'false');
2092             case 'integer':
2093             case 'double':
2094             case 'float':
2095                 return $data;
2096             case 'string':
2097                 return '"' . addslashes($data) . '"';
2098             case 'object':
2099                 $data = get_object_vars($data);
2100             case 'array':
2101                 $output_index_count = 0;
2102                 $output_indexed = array();
2103                 $output_associative = array();
2104                 foreach ($data as $key => $value) {
2105                     $output_indexed[] = json_encode($value);
2106                     $output_associative[] = json_encode($key) . ':' . json_encode($value);
2107                     if ($output_index_count !== NULL && $output_index_count++ !== $key) {
2108                         $output_index_count = NULL;
2109                     }
2110                 }
2111                 if ($output_index_count !== NULL) {
2112                     return '[' . implode(',', $output_indexed) . ']';
2113                 } else {
2114                     return '{' . implode(',', $output_associative) . '}';
2115                 }
2116             default:
2117                 return ''; // Not supported
2118         }
2119     }
2120 }
2121
2122 // Re-write configuration file according to globals.
2123 // Requires some $GLOBALS to be set (login,hash,salt,title).
2124 // If the config file cannot be saved, an error message is displayed and the user is redirected to "Tools" menu.
2125 // (otherwise, the function simply returns.)
2126 function writeConfig()
2127 {
2128     if (is_file($GLOBALS['config']['CONFIG_FILE']) && !isLoggedIn()) die('You are not authorized to alter config.'); // Only logged in user can alter config.
2129     $config='<?php $GLOBALS[\'login\']='.var_export($GLOBALS['login'],true).'; $GLOBALS[\'hash\']='.var_export($GLOBALS['hash'],true).'; $GLOBALS[\'salt\']='.var_export($GLOBALS['salt'],true).'; ';
2130     $config .='$GLOBALS[\'timezone\']='.var_export($GLOBALS['timezone'],true).'; date_default_timezone_set('.var_export($GLOBALS['timezone'],true).'); $GLOBALS[\'title\']='.var_export($GLOBALS['title'],true).';';
2131     $config .= '$GLOBALS[\'titleLink\']='.var_export($GLOBALS['titleLink'],true).'; ';
2132     $config .= '$GLOBALS[\'redirector\']='.var_export($GLOBALS['redirector'],true).'; ';
2133     $config .= '$GLOBALS[\'disablesessionprotection\']='.var_export($GLOBALS['disablesessionprotection'],true).'; ';
2134     $config .= '$GLOBALS[\'disablejquery\']='.var_export($GLOBALS['disablejquery'],true).'; ';
2135     $config .= '$GLOBALS[\'privateLinkByDefault\']='.var_export($GLOBALS['privateLinkByDefault'],true).'; ';
2136     $config .= '$GLOBALS[\'config\'][\'ENABLE_RSS_PERMALINKS\']='.var_export($GLOBALS['config']['ENABLE_RSS_PERMALINKS'], true).'; ';
2137     $config .= '$GLOBALS[\'config\'][\'ENABLE_UPDATECHECK\']='.var_export($GLOBALS['config']['ENABLE_UPDATECHECK'], true).'; ';
2138     $config .= '$GLOBALS[\'config\'][\'HIDE_PUBLIC_LINKS\']='.var_export($GLOBALS['config']['HIDE_PUBLIC_LINKS'], true).'; ';
2139     $config .= ' ?>';
2140     if (!file_put_contents($GLOBALS['config']['CONFIG_FILE'],$config) || strcmp(file_get_contents($GLOBALS['config']['CONFIG_FILE']),$config)!=0)
2141     {
2142         echo '<script>alert("Shaarli could not create the config file. Please make sure Shaarli has the right to write in the folder is it installed in.");document.location=\'?\';</script>';
2143         exit;
2144     }
2145 }
2146
2147 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2148    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2149    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2150    This function is called by passing the URL:
2151    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2152    [URL] is the URL of the link (e.g. a flickr page)
2153    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2154    The function below will fetch the image from the webservice and store it in the cache.
2155 */
2156 function genThumbnail()
2157 {
2158     // Make sure the parameters in the URL were generated by us.
2159     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2160     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2161
2162     // Let's see if we don't already have the image for this URL in the cache.
2163     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2164     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2165     {   // We have the thumbnail, just serve it:
2166         header('Content-Type: image/jpeg');
2167         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2168         return;
2169     }
2170     // We may also serve a blank image (if service did not respond)
2171     $blankname=hash('sha1',$_GET['url']).'.gif';
2172     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2173     {
2174         header('Content-Type: image/gif');
2175         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2176         return;
2177     }
2178
2179     // Otherwise, generate the thumbnail.
2180     $url = $_GET['url'];
2181     $domain = parse_url($url,PHP_URL_HOST);
2182
2183     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2184     {
2185         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2186         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2187
2188         // Is this a link to an image, or to a flickr page ?
2189         $imageurl='';
2190         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2191         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2192             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2193             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2194         }
2195         else // This is a flickr page (html)
2196         {
2197             list($httpstatus,$headers,$data) = getHTTP($url,20); // Get the flickr html page.
2198             if (strpos($httpstatus,'200 OK')!==false)
2199             {
2200                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2201                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!',$data,$matches);
2202                 if (!empty($matches[1])) $imageurl=$matches[1];
2203
2204                 // In albums (and some other pages), the link rel="image_src" is not provided,
2205                 // but flickr provides:
2206                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2207                 if ($imageurl=='')
2208                 {
2209                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!',$data,$matches);
2210                     if (!empty($matches[1])) $imageurl=$matches[1];
2211                 }
2212             }
2213         }
2214
2215         if ($imageurl!='')
2216         {   // Let's download the image.
2217             list($httpstatus,$headers,$data) = getHTTP($imageurl,10); // Image is 240x120, so 10 seconds to download should be enough.
2218             if (strpos($httpstatus,'200 OK')!==false)
2219             {
2220                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2221                 header('Content-Type: image/jpeg');
2222                 echo $data;
2223                 return;
2224             }
2225         }
2226     }
2227
2228     elseif ($domain=='vimeo.com' )
2229     {
2230         // This is more complex: we have to perform a HTTP request, then parse the result.
2231         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2232         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2233         list($httpstatus,$headers,$data) = getHTTP('https://vimeo.com/api/v2/video/'.htmlspecialchars($vid).'.php',5);
2234         if (strpos($httpstatus,'200 OK')!==false)
2235         {
2236             $t = unserialize($data);
2237             $imageurl = $t[0]['thumbnail_medium'];
2238             // Then we download the image and serve it to our client.
2239             list($httpstatus,$headers,$data) = getHTTP($imageurl,10);
2240             if (strpos($httpstatus,'200 OK')!==false)
2241             {
2242                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2243                 header('Content-Type: image/jpeg');
2244                 echo $data;
2245                 return;
2246             }
2247         }
2248     }
2249
2250     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2251     {
2252         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2253         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2254         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2255         list($httpstatus,$headers,$data) = getHTTP($url,5);
2256         if (strpos($httpstatus,'200 OK')!==false)
2257         {
2258             // Extract the link to the thumbnail
2259             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!',$data,$matches);
2260             if (!empty($matches[1]))
2261             {   // Let's download the image.
2262                 $imageurl=$matches[1];
2263                 list($httpstatus,$headers,$data) = getHTTP($imageurl,20); // No control on image size, so wait long enough.
2264                 if (strpos($httpstatus,'200 OK')!==false)
2265                 {
2266                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2267                     file_put_contents($filepath,$data); // Save image to cache.
2268                     if (resizeImage($filepath))
2269                     {
2270                         header('Content-Type: image/jpeg');
2271                         echo file_get_contents($filepath);
2272                         return;
2273                     }
2274                 }
2275             }
2276         }
2277     }
2278
2279     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2280     {
2281         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2282         // http://xkcd.com/327/
2283         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2284         list($httpstatus,$headers,$data) = getHTTP($url,5);
2285         if (strpos($httpstatus,'200 OK')!==false)
2286         {
2287             // Extract the link to the thumbnail
2288             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!',$data,$matches);
2289             if (!empty($matches[1]))
2290             {   // Let's download the image.
2291                 $imageurl=$matches[1];
2292                 list($httpstatus,$headers,$data) = getHTTP($imageurl,20); // No control on image size, so wait long enough.
2293                 if (strpos($httpstatus,'200 OK')!==false)
2294                 {
2295                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2296                     file_put_contents($filepath,$data); // Save image to cache.
2297                     if (resizeImage($filepath))
2298                     {
2299                         header('Content-Type: image/jpeg');
2300                         echo file_get_contents($filepath);
2301                         return;
2302                     }
2303                 }
2304             }
2305         }
2306     }
2307
2308     else
2309     {
2310         // For all other domains, we try to download the image and make a thumbnail.
2311         list($httpstatus,$headers,$data) = getHTTP($url,30);  // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2312         if (strpos($httpstatus,'200 OK')!==false)
2313         {
2314             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2315             file_put_contents($filepath,$data); // Save image to cache.
2316             if (resizeImage($filepath))
2317             {
2318                 header('Content-Type: image/jpeg');
2319                 echo file_get_contents($filepath);
2320                 return;
2321             }
2322         }
2323     }
2324
2325
2326     // Otherwise, return an empty image (8x8 transparent gif)
2327     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2328     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2329     header('Content-Type: image/gif');
2330     echo $blankgif;
2331 }
2332
2333 // Make a thumbnail of the image (to width: 120 pixels)
2334 // Returns true if success, false otherwise.
2335 function resizeImage($filepath)
2336 {
2337     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2338
2339     // Trick: some stupid people rename GIF as JPEG... or else.
2340     // So we really try to open each image type whatever the extension is.
2341     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2342     $im=false;
2343     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2344     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2345     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2346     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2347     $w = imagesx($im);
2348     $h = imagesy($im);
2349     $ystart = 0; $yheight=$h;
2350     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2351     $nw = 120;   // Desired width
2352     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2353     // Resize image:
2354     $im2 = imagecreatetruecolor($nw,$nh);
2355     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2356     imageinterlace($im2,true); // For progressive JPEG.
2357     $tempname=$filepath.'_TEMP.jpg';
2358     imagejpeg($im2, $tempname, 90);
2359     imagedestroy($im);
2360     imagedestroy($im2);
2361     unlink($filepath);
2362     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2363     return true;
2364 }
2365
2366 // Invalidate caches when the database is changed or the user logs out.
2367 // (e.g. tags cache).
2368 function invalidateCaches()
2369 {
2370     unset($_SESSION['tags']);  // Purge cache attached to session.
2371     pageCache::purgeCache();   // Purge page cache shared by sessions.
2372 }
2373
2374 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2375 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2376 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2377 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2378 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=daily')) { showDaily(); exit; }
2379 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2380 renderPage();
2381 ?>