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(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);
 706
 707     // Optionally filter the results:
 708     $linksToDisplay=array();
 709     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 710     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 711     else $linksToDisplay = $LINKSDB;
 712
 713     if ($GLOBALS['config']['HIDE_PUBLIC_LINKS'] && !isLoggedIn())
 714         $linksToDisplay = array();
 715
 716     $nblinksToDisplay = 50;  // Number of links to display.
 717     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 718     {
 719         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 720     }
 721
 722     $pageaddr=htmlspecialchars(indexUrl());
 723     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 724     echo '<channel><title>'.htmlspecialchars($GLOBALS['title']).'</title><link>'.$pageaddr.'</link>';
 725     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 726     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 727     {
 728         echo '<!-- PubSubHubbub Discovery -->';
 729         echo '<link rel="hub" href="'.htmlspecialchars($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 730         echo '<link rel="self" href="'.htmlspecialchars($pageaddr).'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 731         echo '<!-- End Of PubSubHubbub Discovery -->';
 732     }
 733     $i=0;
 734     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 735     while ($i<$nblinksToDisplay && $i<count($keys))
 736     {
 737         $link = $linksToDisplay[$keys[$i]];
 738         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 739         $rfc822date = linkdate2rfc822($link['linkdate']);
 740         $absurl = htmlspecialchars($link['url']);
 741         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 742         if ($usepermalinks===true)
 743             echo '<item><title>'.htmlspecialchars($link['title']).'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 744         else
 745             echo '<item><title>'.htmlspecialchars($link['title']).'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 746         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.htmlspecialchars($rfc822date)."</pubDate>\n";
 747         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 748         {
 749             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.htmlspecialchars($pageaddr).'">'.htmlspecialchars($tag).'</category>'."\n"; }
 750         }
 751
 752         // Add permalink in description
 753         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 754         // If user wants permalinks first, put the final link in description
 755         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 756         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 757         echo '<description><![CDATA['.nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($link['description'])))).$descriptionlink.']]></description>'."\n</item>\n";
 758         $i++;
 759     }
 760     echo '</channel></rss><!-- Cached version of '.htmlspecialchars(pageUrl()).' -->';
 761
 762     $cache->cache(ob_get_contents());
 763     ob_end_flush();
 764     exit;
 765 }
 766
 767 // ------------------------------------------------------------------------------------------
 768 // Output the last N links in ATOM format.
 769 function showATOM()
 770 {
 771     header('Content-Type: application/atom+xml; charset=utf-8');
 772
 773     // $usepermalink : If true, use permalink instead of final link.
 774     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
 775     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 776
 777     // Cache system
 778     $query = $_SERVER["QUERY_STRING"];
 779     $cache = new pageCache(pageUrl(),startsWith($query,'do=atom') && !isLoggedIn());
 780     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
 781     // If cached was not found (or not usable), then read the database and build the response:
 782
 783     $LINKSDB = new LinkDB(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);
 784
 785
 786     // Optionally filter the results:
 787     $linksToDisplay=array();
 788     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 789     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 790     else $linksToDisplay = $LINKSDB;
 791
 792     if ($GLOBALS['config']['HIDE_PUBLIC_LINKS'] && !isLoggedIn())
 793         $linksToDisplay = array();
 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     $LINKSDB = new LinkDB(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);
 869
 870     /* Some Shaarlies may have very few links, so we need to look
 871        back in time (rsort()) until we have enough days ($nb_of_days).
 872     */
 873     $linkdates=array(); foreach($LINKSDB as $linkdate=>$value) { $linkdates[]=$linkdate; }
 874     rsort($linkdates);
 875     $nb_of_days=7; // We take 7 days.
 876     $today=Date('Ymd');
 877     $days=array();
 878     foreach($linkdates as $linkdate)
 879     {
 880         $day=substr($linkdate,0,8); // Extract day (without time)
 881         if (strcmp($day,$today)<0)
 882         {
 883             if (empty($days[$day])) $days[$day]=array();
 884             $days[$day][]=$linkdate;
 885         }
 886         if (count($days)>$nb_of_days) break; // Have we collected enough days?
 887     }
 888
 889     // Build the RSS feed.
 890     header('Content-Type: application/rss+xml; charset=utf-8');
 891     $pageaddr=htmlspecialchars(indexUrl());
 892     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 893     echo '<channel><title>Daily - '.htmlspecialchars($GLOBALS['title']).'</title><link>'.$pageaddr.'</link>';
 894     echo '<description>Daily shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n";
 895
 896     foreach($days as $day=>$linkdates) // For each day.
 897     {
 898         $daydate = utf8_encode(strftime('%A %d, %B %Y',linkdate2timestamp($day.'_000000'))); // Full text date
 899         $rfc822date = linkdate2rfc822($day.'_000000');
 900         $absurl=htmlspecialchars(indexUrl().'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 901         echo '<item><title>'.htmlspecialchars($GLOBALS['title'].' - '.$daydate).'</title><guid>'.$absurl.'</guid><link>'.$absurl.'</link>';
 902         echo '<pubDate>'.htmlspecialchars($rfc822date)."</pubDate>";
 903
 904         // Build the HTML body of this RSS entry.
 905         $html='';
 906         $href='';
 907         $links=array();
 908         // We pre-format some fields for proper output.
 909         foreach($linkdates as $linkdate)
 910         {
 911             $l = $LINKSDB[$linkdate];
 912             $l['formatedDescription']=nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($l['description']))));
 913             $l['thumbnail'] = thumbnail($l['url']);
 914             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
 915             if (startsWith($l['url'],'?')) $l['url']=indexUrl().$l['url'];  // make permalink URL absolute
 916             $links[$linkdate]=$l;
 917         }
 918         // Then build the HTML for this day:
 919         $tpl = new RainTPL;
 920         $tpl->assign('links',$links);
 921         $html = $tpl->draw('dailyrss',$return_string=true);
 922         echo "\n";
 923         echo '<description><![CDATA['.$html.']]></description>'."\n</item>\n\n";
 924
 925     }
 926     echo '</channel></rss><!-- Cached version of '.htmlspecialchars(pageUrl()).' -->';
 927
 928     $cache->cache(ob_get_contents());
 929     ob_end_flush();
 930     exit;
 931 }
 932
 933 // "Daily" page.
 934 function showDaily()
 935 {
 936     $LINKSDB = new LinkDB(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);
 937
 938
 939     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 940     if (isset($_GET['day'])) $day=$_GET['day'];
 941
 942     $days = $LINKSDB->days();
 943     $i = array_search($day,$days);
 944     if ($i==false) { $i=count($days)-1; $day=$days[$i]; }
 945     $previousday='';
 946     $nextday='';
 947     if ($i!==false)
 948     {
 949         if ($i>1) $previousday=$days[$i-1];
 950         if ($i<count($days)-1) $nextday=$days[$i+1];
 951     }
 952
 953     $linksToDisplay=$LINKSDB->filterDay($day);
 954     if ($GLOBALS['config']['HIDE_PUBLIC_LINKS'] && !isLoggedIn())
 955         $linksToDisplay = array();
 956     // We pre-format some fields for proper output.
 957     foreach($linksToDisplay as $key=>$link)
 958     {
 959         $taglist = explode(' ',$link['tags']);
 960         uasort($taglist, 'strcasecmp');
 961         $linksToDisplay[$key]['taglist']=$taglist;
 962         $linksToDisplay[$key]['formatedDescription']=nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($link['description']))));
 963         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
 964         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
 965     }
 966
 967     /* We need to spread the articles on 3 columns.
 968        I did not want to use a JavaScript lib like http://masonry.desandro.com/
 969        so I manually spread entries with a simple method: I roughly evaluate the
 970        height of a div according to title and description length.
 971     */
 972     $columns=array(array(),array(),array()); // Entries to display, for each column.
 973     $fill=array(0,0,0);  // Rough estimate of columns fill.
 974     foreach($linksToDisplay as $key=>$link)
 975     {
 976         // Roughly estimate length of entry (by counting characters)
 977         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
 978         // Description: 836 characters gives roughly 342 pixel height.
 979         // This is not perfect, but it's usually OK.
 980         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
 981         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
 982         // Then put in column which is the less filled:
 983         $smallest=min($fill); // find smallest value in array.
 984         $index=array_search($smallest,$fill); // find index of this smallest value.
 985         array_push($columns[$index],$link); // Put entry in this column.
 986         $fill[$index]+=$length;
 987     }
 988     $PAGE = new pageBuilder;
 989     $PAGE->assign('linksToDisplay',$linksToDisplay);
 990     $PAGE->assign('linkcount',count($LINKSDB));
 991     $PAGE->assign('cols', $columns);
 992     $PAGE->assign('day',utf8_encode(strftime('%A %d, %B %Y',linkdate2timestamp($day.'_000000'))));
 993     $PAGE->assign('previousday',$previousday);
 994     $PAGE->assign('nextday',$nextday);
 995     $PAGE->renderPage('daily');
 996     exit;
 997 }
 998
 999
1000 // ------------------------------------------------------------------------------------------
1001 // Render HTML page (according to URL parameters and user rights)
1002 function renderPage()
1003 {
1004     $LINKSDB = new LinkDB(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);
1005
1006     // -------- Display login form.
1007     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=login'))
1008     {
1009         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1010         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1011         $PAGE = new pageBuilder;
1012         $PAGE->assign('token',$token);
1013         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER']:''));
1014         $PAGE->renderPage('loginform');
1015         exit;
1016     }
1017     // -------- User wants to logout.
1018     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1019     {
1020         invalidateCaches();
1021         logout();
1022         header('Location: ?');
1023         exit;
1024     }
1025
1026     // -------- Picture wall
1027     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=picwall'))
1028     {
1029         // Optionally filter the results:
1030         $links=array();
1031         if (!empty($_GET['searchterm'])) $links = $LINKSDB->filterFulltext($_GET['searchterm']);
1032         elseif (!empty($_GET['searchtags']))   $links = $LINKSDB->filterTags(trim($_GET['searchtags']));
1033         else $links = $LINKSDB;
1034
1035         if ($GLOBALS['config']['HIDE_PUBLIC_LINKS'] && !isLoggedIn())
1036             $links = array();
1037
1038         $body='';
1039         $linksToDisplay=array();
1040
1041         // Get only links which have a thumbnail.
1042         foreach($links as $link)
1043         {
1044             $permalink='?'.htmlspecialchars(smallhash($link['linkdate']),ENT_QUOTES);
1045             $thumb=lazyThumbnail($link['url'],$permalink);
1046             if ($thumb!='') // Only output links which have a thumbnail.
1047             {
1048                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1049                 $linksToDisplay[]=$link; // Add to array.
1050             }
1051         }
1052
1053         $PAGE = new pageBuilder;
1054         $PAGE->assign('linkcount',count($LINKSDB));
1055         $PAGE->assign('linksToDisplay',$linksToDisplay);
1056         $PAGE->renderPage('picwall');
1057         exit;
1058     }
1059
1060     // -------- Tag cloud
1061     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tagcloud'))
1062     {
1063         $tags= $LINKSDB->allTags();
1064         if ($GLOBALS['config']['HIDE_PUBLIC_LINKS'] && !isLoggedIn())
1065             $tags = array();
1066         // We sort tags alphabetically, then choose a font size according to count.
1067         // First, find max value.
1068         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1069         ksort($tags);
1070         $tagList=array();
1071         foreach($tags as $key=>$value)
1072         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1073         {
1074             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1075         }
1076         $PAGE = new pageBuilder;
1077         $PAGE->assign('linkcount',count($LINKSDB));
1078         $PAGE->assign('tags',$tagList);
1079         $PAGE->renderPage('tagcloud');
1080         exit;
1081     }
1082
1083     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1084     if (isset($_GET['addtag']))
1085     {
1086         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1087         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1088         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1089
1090         // Check if this tag is already in the search query and ignore it if it is.
1091         // Each tag is always separated by a space
1092         $current_tags = explode(' ', $params['searchtags']);
1093         $addtag = true;
1094         foreach ($current_tags as $value) {
1095             if ($value === $_GET['addtag']) {
1096                 $addtag = false;
1097                 break;
1098             }
1099         }
1100         // Append the tag if necessary
1101         if (empty($params['searchtags'])) {
1102             $params['searchtags'] = trim($_GET['addtag']);
1103         }
1104         else if ($addtag) {
1105             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1106         }
1107
1108         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1109         header('Location: ?'.http_build_query($params));
1110         exit;
1111     }
1112
1113     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1114     if (isset($_GET['removetag']))
1115     {
1116         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1117         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?'); exit; } // In case browser does not send HTTP_REFERER
1118         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1119         if (isset($params['searchtags']))
1120         {
1121             $tags = explode(' ',$params['searchtags']);
1122             $tags=array_diff($tags, array($_GET['removetag'])); // Remove value from array $tags.
1123             if (count($tags)==0) unset($params['searchtags']); else $params['searchtags'] = implode(' ',$tags);
1124             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1125         }
1126         header('Location: ?'.http_build_query($params));
1127         exit;
1128     }
1129
1130     // -------- User wants to change the number of links per page (linksperpage=...)
1131     if (isset($_GET['linksperpage']))
1132     {
1133         if (is_numeric($_GET['linksperpage'])) { $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage'])); }
1134         // Make sure the referrer is Shaarli itself.
1135         $referer = '?';
1136         if (!empty($_SERVER['HTTP_REFERER']) && strcmp(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST),$_SERVER['HTTP_HOST'])==0)
1137             $referer = $_SERVER['HTTP_REFERER'];
1138         header('Location: '.$referer);
1139         exit;
1140     }
1141
1142     // -------- User wants to see only private links (toggle)
1143     if (isset($_GET['privateonly']))
1144     {
1145         if (empty($_SESSION['privateonly']))
1146         {
1147             $_SESSION['privateonly']=1; // See only private links
1148         }
1149         else
1150         {
1151             unset($_SESSION['privateonly']); // See all links
1152         }
1153         // Make sure the referrer is Shaarli itself.
1154         $referer = '?';
1155         if (!empty($_SERVER['HTTP_REFERER']) && strcmp(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST),$_SERVER['HTTP_HOST'])==0)
1156             $referer = $_SERVER['HTTP_REFERER'];
1157         header('Location: '.$referer);
1158         exit;
1159     }
1160
1161     // -------- Handle other actions allowed for non-logged in users:
1162     if (!isLoggedIn())
1163     {
1164         // User tries to post new link but is not logged in:
1165         // Show login screen, then redirect to ?post=...
1166         if (isset($_GET['post']))
1167         {
1168             header('Location: ?do=login&post='.urlencode($_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.
1169             exit;
1170         }
1171
1172                 // Same case as above except that user tried to access ?do=addlink without being logged in
1173                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1174                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1175                         header('Location: ?do=login&post=');
1176                         exit;
1177                 }
1178
1179         $PAGE = new pageBuilder;
1180         buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1181         $PAGE->renderPage('linklist');
1182         exit; // Never remove this one! All operations below are reserved for logged in user.
1183     }
1184
1185     // -------- All other functions are reserved for the registered user:
1186
1187     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1188     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tools'))
1189     {
1190         $PAGE = new pageBuilder;
1191         $PAGE->assign('linkcount',count($LINKSDB));
1192         $PAGE->assign('pageabsaddr',indexUrl());
1193         $PAGE->renderPage('tools');
1194         exit;
1195     }
1196
1197     // -------- User wants to change his/her password.
1198     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changepasswd'))
1199     {
1200         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1201         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1202         {
1203             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1204
1205             // Make sure old password is correct.
1206             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1207             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1208             // Save new password
1209             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1210             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1211             writeConfig();
1212             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1213             exit;
1214         }
1215         else // show the change password form.
1216         {
1217             $PAGE = new pageBuilder;
1218             $PAGE->assign('linkcount',count($LINKSDB));
1219             $PAGE->assign('token',getToken());
1220             $PAGE->renderPage('changepassword');
1221             exit;
1222         }
1223     }
1224
1225     // -------- User wants to change configuration
1226     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=configure'))
1227     {
1228         if (!empty($_POST['title']) )
1229         {
1230             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1231             $tz = 'UTC';
1232             if (!empty($_POST['continent']) && !empty($_POST['city']))
1233                 if (isTZvalid($_POST['continent'],$_POST['city']))
1234                     $tz = $_POST['continent'].'/'.$_POST['city'];
1235             $GLOBALS['timezone'] = $tz;
1236             $GLOBALS['title']=$_POST['title'];
1237             $GLOBALS['titleLink']=$_POST['titleLink'];
1238             $GLOBALS['redirector']=$_POST['redirector'];
1239             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1240             $GLOBALS['disablejquery']=!empty($_POST['disablejquery']);
1241             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1242             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1243             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1244             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1245             writeConfig();
1246             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1247             exit;
1248         }
1249         else // Show the configuration form.
1250         {
1251             $PAGE = new pageBuilder;
1252             $PAGE->assign('linkcount',count($LINKSDB));
1253             $PAGE->assign('token',getToken());
1254             $PAGE->assign('title',htmlspecialchars( empty($GLOBALS['title']) ? '' : $GLOBALS['title'] , ENT_QUOTES));
1255             $PAGE->assign('redirector',htmlspecialchars( empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] , ENT_QUOTES));
1256             list($timezone_form,$timezone_js) = templateTZform($GLOBALS['timezone']);
1257             $PAGE->assign('timezone_form',$timezone_form); // FIXME: Put entire tz form generation in template?
1258             $PAGE->assign('timezone_js',$timezone_js);
1259             $PAGE->renderPage('configure');
1260             exit;
1261         }
1262     }
1263
1264     // -------- User wants to rename a tag or delete it
1265     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changetag'))
1266     {
1267         if (empty($_POST['fromtag']))
1268         {
1269             $PAGE = new pageBuilder;
1270             $PAGE->assign('linkcount',count($LINKSDB));
1271             $PAGE->assign('token',getToken());
1272             $PAGE->assign('tags', $LINKSDB->allTags());
1273             $PAGE->renderPage('changetag');
1274             exit;
1275         }
1276         if (!tokenOk($_POST['token'])) die('Wrong token.');
1277
1278         // Delete a tag:
1279         if (!empty($_POST['deletetag']) && !empty($_POST['fromtag']))
1280         {
1281             $needle=trim($_POST['fromtag']);
1282             $linksToAlter = $LINKSDB->filterTags($needle,true); // True for case-sensitive tag search.
1283             foreach($linksToAlter as $key=>$value)
1284             {
1285                 $tags = explode(' ',trim($value['tags']));
1286                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1287                 $value['tags']=trim(implode(' ',$tags));
1288                 $LINKSDB[$key]=$value;
1289             }
1290             $LINKSDB->savedb(); // Save to disk.
1291             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1292             exit;
1293         }
1294
1295         // Rename a tag:
1296         if (!empty($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag']))
1297         {
1298             $needle=trim($_POST['fromtag']);
1299             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
1300             foreach($linksToAlter as $key=>$value)
1301             {
1302                 $tags = explode(' ',trim($value['tags']));
1303                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1304                 $value['tags']=trim(implode(' ',$tags));
1305                 $LINKSDB[$key]=$value;
1306             }
1307             $LINKSDB->savedb(); // Save to disk.
1308             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1309             exit;
1310         }
1311     }
1312
1313     // -------- User wants to add a link without using the bookmarklet: Show form.
1314     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=addlink'))
1315     {
1316         $PAGE = new pageBuilder;
1317         $PAGE->assign('linkcount',count($LINKSDB));
1318         $PAGE->renderPage('addlink');
1319         exit;
1320     }
1321
1322     // -------- User clicked the "Save" button when editing a link: Save link to database.
1323     if (isset($_POST['save_edit']))
1324     {
1325         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1326         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1327         $linkdate=$_POST['lf_linkdate'];
1328         $url = trim($_POST['lf_url']);
1329         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?') && !startsWith($url,'javascript:'))
1330             $url = 'http://'.$url;
1331         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1332                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1333         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1334         $LINKSDB[$linkdate] = $link;
1335         $LINKSDB->savedb(); // Save to disk.
1336         pubsubhub();
1337
1338         // If we are called from the bookmarklet, we must close the popup:
1339         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1340         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1341         $returnurl .= '#'.smallHash($linkdate);  // Scroll to the link which has been edited.
1342         if (strstr($returnurl, "do=addlink")) { $returnurl = '?'; } //if we come from ?do=addlink, set returnurl to homepage instead
1343         header('Location: '.$returnurl); // After saving the link, redirect to the page the user was on.
1344         exit;
1345     }
1346
1347     // -------- User clicked the "Cancel" button when editing a link.
1348     if (isset($_POST['cancel_edit']))
1349     {
1350         // If we are called from the bookmarklet, we must close the popup:
1351         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1352         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1353         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1354         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1355         exit;
1356     }
1357
1358     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1359     if (isset($_POST['delete_link']))
1360     {
1361         if (!tokenOk($_POST['token'])) die('Wrong token.');
1362         // We do not need to ask for confirmation:
1363         // - confirmation is handled by JavaScript
1364         // - we are protected from XSRF by the token.
1365         $linkdate=$_POST['lf_linkdate'];
1366         unset($LINKSDB[$linkdate]);
1367         $LINKSDB->savedb(); // save to disk
1368
1369         // If we are called from the bookmarklet, we must close the popup:
1370         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1371         // Pick where we're going to redirect
1372         // =============================================================
1373         // Basically, we can't redirect to where we were previously if it was a permalink
1374         // or an edit_link, because it would 404.
1375         // Cases:
1376         //    - /             : nothing in $_GET, redirect to self
1377         //    - /?page        : redirect to self
1378         //    - /?searchterm  : redirect to self (there might be other links)
1379         //    - /?searchtags  : redirect to self
1380         //    - /permalink    : redirect to / (the link does not exist anymore)
1381         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1382         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1383         // redirect is not satisfied, and only then redirect to /
1384         $location = "?";
1385         // Self redirection
1386         if (count($_GET) == 0    ||
1387             isset($_GET['page']) ||
1388             isset($_GET['searchterm']) ||
1389             isset($_GET['searchtags'])) {
1390
1391             if (isset($_POST['returnurl'])) {
1392                 $location = $_POST['returnurl']; // Handle redirects given by the form
1393             }
1394
1395             if ($location === "?" &&
1396                 isset($_SERVER['HTTP_REFERER'])) { // Handle HTTP_REFERER in case we're not coming from the same place.
1397                 $location = $_SERVER['HTTP_REFERER'];
1398             }
1399         }
1400
1401         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1402         exit;
1403     }
1404
1405     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1406     if (isset($_GET['edit_link']))
1407     {
1408         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1409         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1410         $PAGE = new pageBuilder;
1411         $PAGE->assign('linkcount',count($LINKSDB));
1412         $PAGE->assign('link',$link);
1413         $PAGE->assign('link_is_new',false);
1414         $PAGE->assign('token',getToken()); // XSRF protection.
1415         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : ''));
1416         $PAGE->assign('tags', $LINKSDB->allTags());
1417         $PAGE->renderPage('editlink');
1418         exit;
1419     }
1420
1421     // -------- User want to post a new link: Display link edit form.
1422     if (isset($_GET['post']))
1423     {
1424         $url=$_GET['post'];
1425
1426
1427         // We remove the annoying parameters added by FeedBurner, GoogleFeedProxy, Facebook...
1428         $annoyingpatterns = array('/[\?&]utm_source=[^&]*/',
1429             '/[\?&]utm_campaign=[^&]*/',
1430             '/[\?&]utm_medium=[^&]*/',
1431             '/#xtor=RSS-[^&]*/',
1432             '/[\?&]fb_[^&]*/',
1433             '/[\?&]__scoop[^&]*/',
1434             '/#tk\.rss_all\?/',
1435             '/[\?&]action_ref_map=[^&]*/',
1436             '/[\?&]action_type_map=[^&]*/',
1437             '/[\?&]action_object_map=[^&]*/',
1438             '/[\?&]utm_content=[^&]*/',
1439             '/[\?&]fb=[^&]*/',
1440             '/[\?&]xtor=[^&]*/'
1441             );
1442         foreach($annoyingpatterns as $pattern)
1443         {
1444             $url = preg_replace($pattern, "", $url);
1445         }
1446
1447         $link_is_new = false;
1448         $link = $LINKSDB->getLinkFromUrl($url); // Check if URL is not already in database (in this case, we will edit the existing link)
1449         if (!$link)
1450         {
1451             $link_is_new = true;  // This is a new link
1452             $linkdate = strval(date('Ymd_His'));
1453             $title = (empty($_GET['title']) ? '' : $_GET['title'] ); // Get title if it was provided in URL (by the bookmarklet).
1454             $description = (empty($_GET['description']) ? '' : $_GET['description']); // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1455             $tags = (empty($_GET['tags']) ? '' : $_GET['tags'] ); // Get tags if it was provided in URL
1456             $private = (!empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0); // Get private if it was provided in URL
1457             if (($url!='') && parse_url($url,PHP_URL_SCHEME)=='') $url = 'http://'.$url;
1458             // 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.)
1459             if (empty($title) && parse_url($url,PHP_URL_SCHEME)=='http')
1460             {
1461                 list($status,$headers,$data) = getHTTP($url,4); // Short timeout to keep the application responsive.
1462                 // FIXME: Decode charset according to specified in either 1) HTTP response headers or 2) <head> in html
1463                 if (strpos($status,'200 OK')!==false)
1464                                          {
1465                         // Look for charset in html header.
1466                                                 preg_match('#<meta .*charset=.*>#Usi', $data, $meta);
1467
1468                                                 // If found, extract encoding.
1469                                                 if (!empty($meta[0]))
1470                                                 {
1471                                                         // Get encoding specified in header.
1472                                                         preg_match('#charset="?(.*)"#si', $meta[0], $enc);
1473                                                         // If charset not found, use utf-8.
1474                                                         $html_charset = (!empty($enc[1])) ? strtolower($enc[1]) : 'utf-8';
1475                                                 }
1476                                                 else { $html_charset = 'utf-8'; }
1477
1478                                                 // Extract title
1479                                                 $title = html_extract_title($data);
1480                                                 if (!empty($title))
1481                                                 {
1482                                                         // Re-encode title in utf-8 if necessary.
1483                                                         $title = ($html_charset == 'iso-8859-1') ? utf8_encode($title) : $title;
1484                                                 }
1485                                         }
1486             }
1487             if ($url=='') // In case of empty URL, this is just a text (with a link that points to itself)
1488             {
1489                 $url='?'.smallHash($linkdate);
1490                 $title='Note: ';
1491             }
1492             $link = array('linkdate'=>$linkdate,'title'=>$title,'url'=>$url,'description'=>$description,'tags'=>$tags,'private'=>$private);
1493         }
1494
1495         $PAGE = new pageBuilder;
1496         $PAGE->assign('linkcount',count($LINKSDB));
1497         $PAGE->assign('link',$link);
1498         $PAGE->assign('link_is_new',$link_is_new);
1499         $PAGE->assign('token',getToken()); // XSRF protection.
1500         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : ''));
1501         $PAGE->assign('source',(isset($_GET['source']) ? $_GET['source'] : ''));
1502         $PAGE->assign('tags', $LINKSDB->allTags());
1503         $PAGE->renderPage('editlink');
1504         exit;
1505     }
1506
1507     // -------- Export as Netscape Bookmarks HTML file.
1508     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=export'))
1509     {
1510         if (empty($_GET['what']))
1511         {
1512             $PAGE = new pageBuilder;
1513             $PAGE->assign('linkcount',count($LINKSDB));
1514             $PAGE->renderPage('export');
1515             exit;
1516         }
1517         $exportWhat=$_GET['what'];
1518         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1519
1520         header('Content-Type: text/html; charset=utf-8');
1521         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1522         $currentdate=date('Y/m/d H:i:s');
1523         echo <<<HTML
1524 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1525 <!-- This is an automatically generated file.
1526      It will be read and overwritten.
1527      DO NOT EDIT! -->
1528 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1529 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1530 <TITLE>Bookmarks</TITLE>
1531 <H1>Bookmarks</H1>
1532 HTML;
1533         foreach($LINKSDB as $link)
1534         {
1535             if ($exportWhat=='all' ||
1536                ($exportWhat=='private' && $link['private']!=0) ||
1537                ($exportWhat=='public' && $link['private']==0))
1538             {
1539                 echo '<DT><A HREF="'.htmlspecialchars($link['url']).'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1540                 if ($link['tags']!='') echo ' TAGS="'.htmlspecialchars(str_replace(' ',',',$link['tags'])).'"';
1541                 echo '>'.htmlspecialchars($link['title'])."</A>\n";
1542                 if ($link['description']!='') echo '<DD>'.htmlspecialchars($link['description'])."\n";
1543             }
1544         }
1545                 exit;
1546     }
1547
1548     // -------- User is uploading a file for import
1549     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1550     {
1551         // If file is too big, some form field may be missing.
1552         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1553         {
1554             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1555             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.htmlspecialchars($returnurl).'\';</script>';
1556             exit;
1557         }
1558         if (!tokenOk($_POST['token'])) die('Wrong token.');
1559         importFile();
1560         exit;
1561     }
1562
1563     // -------- Show upload/import dialog:
1564     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=import'))
1565     {
1566         $PAGE = new pageBuilder;
1567         $PAGE->assign('linkcount',count($LINKSDB));
1568         $PAGE->assign('token',getToken());
1569         $PAGE->assign('maxfilesize',getMaxFileSize());
1570         $PAGE->renderPage('import');
1571         exit;
1572     }
1573
1574     // -------- Otherwise, simply display search form and links:
1575     $PAGE = new pageBuilder;
1576     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1577     $PAGE->renderPage('linklist');
1578     exit;
1579 }
1580
1581 // -----------------------------------------------------------------------------------------------
1582 // Process the import file form.
1583 function importFile()
1584 {
1585     if (!(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'])) { die('Not allowed.'); }
1586     $LINKSDB = new LinkDB(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);
1587     $filename=$_FILES['filetoupload']['name'];
1588     $filesize=$_FILES['filetoupload']['size'];
1589     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1590     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1591     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1592     $import_count=0;
1593
1594     // Sniff file type:
1595     $type='unknown';
1596     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1597
1598     // Then import the bookmarks.
1599     if ($type=='netscape')
1600     {
1601         // This is a standard Netscape-style bookmark file.
1602         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1603         foreach(explode('<DT>',$data) as $html) // explode is very fast
1604         {
1605             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1606             $d = explode('<DD>',$html);
1607             if (startswith($d[0],'<A '))
1608             {
1609                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1610                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1611                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1612                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1613                 $raw_add_date=0;
1614                 foreach($matches as $m)
1615                 {
1616                     $attr=$m[1]; $value=$m[2];
1617                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1618                     elseif ($attr=='ADD_DATE')
1619                     {
1620                         $raw_add_date=intval($value);
1621                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1622                     }
1623                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1624                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1625                 }
1626                 if ($link['url']!='')
1627                 {
1628                     if ($private==1) $link['private']=1;
1629                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1630                     if ($dblink==false)
1631                     {  // Link not in database, let's import it...
1632                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1633
1634                        // Make sure date/time is not already used by another link.
1635                        // (Some bookmark files have several different links with the same ADD_DATE)
1636                        // We increment date by 1 second until we find a date which is not used in DB.
1637                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1638                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1639                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1640                        $LINKSDB[$link['linkdate']] = $link;
1641                        $import_count++;
1642                     }
1643                     else // Link already present in database.
1644                     {
1645                         if ($overwrite)
1646                         {   // If overwrite is required, we import link data, except date/time.
1647                             $link['linkdate']=$dblink['linkdate'];
1648                             $LINKSDB[$link['linkdate']] = $link;
1649                             $import_count++;
1650                         }
1651                     }
1652
1653                 }
1654             }
1655         }
1656         $LINKSDB->savedb();
1657
1658         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1659     }
1660     else
1661     {
1662         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1663     }
1664 }
1665
1666 // -----------------------------------------------------------------------------------------------
1667 // Template for the list of links (<div id="linklist">)
1668 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1669 function buildLinkList($PAGE,$LINKSDB)
1670 {
1671     // ---- Filter link database according to parameters
1672     $linksToDisplay=array();
1673     $search_type='';
1674     $search_crits='';
1675     if (isset($_GET['searchterm'])) // Fulltext search
1676     {
1677         $linksToDisplay = $LINKSDB->filterFulltext(trim($_GET['searchterm']));
1678         if ($GLOBALS['config']['HIDE_PUBLIC_LINKS'] && !isLoggedIn())
1679             $linksToDisplay = array();
1680         $search_crits=htmlspecialchars(trim($_GET['searchterm']));
1681         $search_type='fulltext';
1682     }
1683     elseif (isset($_GET['searchtags'])) // Search by tag
1684     {
1685         $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
1686         if ($GLOBALS['config']['HIDE_PUBLIC_LINKS'] && !isLoggedIn())
1687             $linksToDisplay = array();
1688         $search_crits=explode(' ',trim($_GET['searchtags']));
1689         $search_type='tags';
1690     }
1691     elseif (isset($_SERVER['QUERY_STRING']) && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/',$_SERVER['QUERY_STRING'])) // Detect smallHashes in URL
1692     {
1693         $linksToDisplay = $LINKSDB->filterSmallHash(substr(trim($_SERVER["QUERY_STRING"], '/'),0,6));
1694         if (count($linksToDisplay)==0)
1695         {
1696             header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
1697             echo '<h1>404 Not found.</h1>Oh crap. The link you are trying to reach does not exist or has been deleted.';
1698             echo '<br>You would mind <a href="?">clicking here</a>?';
1699             exit;
1700         }
1701         $search_type='permalink';
1702     }
1703     // We chose to disable all private links and the user isn't logged in, do not return any link.
1704     else if ($GLOBALS['config']['HIDE_PUBLIC_LINKS'] && !isLoggedIn())
1705         $linksToDisplay = array();
1706     else
1707         $linksToDisplay = $LINKSDB;  // Otherwise, display without filtering.
1708
1709
1710     // Option: Show only private links
1711     if (!empty($_SESSION['privateonly']))
1712     {
1713         $tmp = array();
1714         foreach($linksToDisplay as $linkdate=>$link)
1715         {
1716             if ($link['private']!=0) $tmp[$linkdate]=$link;
1717         }
1718         $linksToDisplay=$tmp;
1719     }
1720
1721     // ---- Handle paging.
1722     /* Can someone explain to me why you get the following error when using array_keys() on an object which implements the interface ArrayAccess???
1723        "Warning: array_keys() expects parameter 1 to be array, object given in ... "
1724        If my class implements ArrayAccess, why won't array_keys() accept it ?  ( $keys=array_keys($linksToDisplay); )
1725     */
1726     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; } // Stupid and ugly. Thanks PHP.
1727
1728     // If there is only a single link, we change on-the-fly the title of the page.
1729     if (count($linksToDisplay)==1) $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1730
1731     // Select articles according to paging.
1732     $pagecount = ceil(count($keys)/$_SESSION['LINKS_PER_PAGE']);
1733     $pagecount = ($pagecount==0 ? 1 : $pagecount);
1734     $page=( empty($_GET['page']) ? 1 : intval($_GET['page']));
1735     $page = ( $page<1 ? 1 : $page );
1736     $page = ( $page>$pagecount ? $pagecount : $page );
1737     $i = ($page-1)*$_SESSION['LINKS_PER_PAGE']; // Start index.
1738     $end = $i+$_SESSION['LINKS_PER_PAGE'];
1739     $linkDisp=array(); // Links to display
1740     while ($i<$end && $i<count($keys))
1741     {
1742         $link = $linksToDisplay[$keys[$i]];
1743         $link['description']=nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($link['description']))));
1744         $title=$link['title'];
1745         $classLi =  $i%2!=0 ? '' : 'publicLinkHightLight';
1746         $link['class'] = ($link['private']==0 ? $classLi : 'private');
1747         $link['timestamp']=linkdate2timestamp($link['linkdate']);
1748         $taglist = explode(' ',$link['tags']);
1749         uasort($taglist, 'strcasecmp');
1750         $link['taglist']=$taglist;
1751
1752         if ($link["url"][0] === '?' && // Check for both signs of a note: starting with ? and 7 chars long. I doubt that you'll post any links that look like this.
1753             strlen($link["url"]) === 7) {
1754             $link["url"] = indexUrl() . $link["url"];
1755         }
1756
1757         $linkDisp[$keys[$i]] = $link;
1758         $i++;
1759     }
1760
1761     // Compute paging navigation
1762     $searchterm= ( empty($_GET['searchterm']) ? '' : '&searchterm='.$_GET['searchterm'] );
1763     $searchtags= ( empty($_GET['searchtags']) ? '' : '&searchtags='.$_GET['searchtags'] );
1764     $paging='';
1765     $previous_page_url=''; if ($i!=count($keys)) $previous_page_url='?page='.($page+1).$searchterm.$searchtags;
1766     $next_page_url='';if ($page>1) $next_page_url='?page='.($page-1).$searchterm.$searchtags;
1767
1768     $token = ''; if (isLoggedIn()) $token=getToken();
1769
1770     // Fill all template fields.
1771     $PAGE->assign('linkcount',count($LINKSDB));
1772     $PAGE->assign('previous_page_url',$previous_page_url);
1773     $PAGE->assign('next_page_url',$next_page_url);
1774     $PAGE->assign('page_current',$page);
1775     $PAGE->assign('page_max',$pagecount);
1776     $PAGE->assign('result_count',count($linksToDisplay));
1777     $PAGE->assign('search_type',$search_type);
1778     $PAGE->assign('search_crits',$search_crits);
1779     $PAGE->assign('redirector',empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector']); // Optional redirector URL.
1780     $PAGE->assign('token',$token);
1781     $PAGE->assign('links',$linkDisp);
1782     return;
1783 }
1784
1785 // Compute the thumbnail for a link.
1786 //
1787 // With a link to the original URL.
1788 // Understands various services (youtube.com...)
1789 // Input: $url = URL for which the thumbnail must be found.
1790 //        $href = if provided, this URL will be followed instead of $url
1791 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1792 // Some of them may be missing.
1793 // Return an empty array if no thumbnail available.
1794 function computeThumbnail($url,$href=false)
1795 {
1796     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
1797     if ($href==false) $href=$url;
1798
1799     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1800     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1801     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1802     $domain = parse_url($url,PHP_URL_HOST);
1803     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1804     {
1805         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1806         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1807                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1808     }
1809     if ($domain=='youtu.be') // Youtube short links
1810     {
1811         $path = parse_url($url,PHP_URL_PATH);
1812         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1813                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1814     }
1815     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1816     {
1817         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1818         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1819                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1820     }
1821
1822     if ($domain=='imgur.com')
1823     {
1824         $path = parse_url($url,PHP_URL_PATH);
1825         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1826         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1827                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1828         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1829                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1830
1831         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1832                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1833     }
1834     if ($domain=='i.imgur.com')
1835     {
1836         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1837         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1838                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1839     }
1840     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1841     {
1842         if (strpos($url,'dailymotion.com/video/')!==false)
1843         {
1844             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1845             return array('src'=>$thumburl,
1846                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1847         }
1848     }
1849     if (endsWith($domain,'.imageshack.us'))
1850     {
1851         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1852         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1853         {
1854             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1855             return array('src'=>$thumburl,
1856                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1857         }
1858     }
1859
1860     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1861     // So we deport the thumbnail generation in order not to slow down page generation
1862     // (and we also cache the thumbnail)
1863
1864     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1865
1866     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1867         || $domain=='vimeo.com'
1868         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1869         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1870     )
1871     {
1872         if ($domain=='vimeo.com')
1873         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1874             $path = parse_url($url,PHP_URL_PATH);
1875             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1876         }
1877         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
1878         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
1879             $path = parse_url($url,PHP_URL_PATH);
1880             if (!preg_match('!/\d+.+?!',$path)) return array();
1881         }
1882         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
1883         {   // Make sure this TED URL points to a video (/talks/...)
1884             $path = parse_url($url,PHP_URL_PATH);
1885             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
1886         }
1887         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1888         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.htmlspecialchars($sign).'&url='.urlencode($url),
1889                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1890     }
1891
1892     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1893     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1894     // But using the extension will do.
1895     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1896     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1897     {
1898         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1899         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.htmlspecialchars($sign).'&url='.urlencode($url),
1900                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1901     }
1902     return array(); // No thumbnail.
1903
1904 }
1905
1906
1907 // Returns the HTML code to display a thumbnail for a link
1908 // with a link to the original URL.
1909 // Understands various services (youtube.com...)
1910 // Input: $url = URL for which the thumbnail must be found.
1911 //        $href = if provided, this URL will be followed instead of $url
1912 // Returns '' if no thumbnail available.
1913 function thumbnail($url,$href=false)
1914 {
1915     $t = computeThumbnail($url,$href);
1916     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1917
1918     $html='<a href="'.htmlspecialchars($t['href']).'"><img src="'.htmlspecialchars($t['src']).'"';
1919     if (!empty($t['width']))  $html.=' width="'.htmlspecialchars($t['width']).'"';
1920     if (!empty($t['height'])) $html.=' height="'.htmlspecialchars($t['height']).'"';
1921     if (!empty($t['style']))  $html.=' style="'.htmlspecialchars($t['style']).'"';
1922     if (!empty($t['alt']))    $html.=' alt="'.htmlspecialchars($t['alt']).'"';
1923     $html.='></a>';
1924     return $html;
1925 }
1926
1927 // Returns the HTML code to display a thumbnail for a link
1928 // for the picture wall (using lazy image loading)
1929 // Understands various services (youtube.com...)
1930 // Input: $url = URL for which the thumbnail must be found.
1931 //        $href = if provided, this URL will be followed instead of $url
1932 // Returns '' if no thumbnail available.
1933 function lazyThumbnail($url,$href=false)
1934 {
1935     $t = computeThumbnail($url,$href);
1936     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1937
1938     $html='<a href="'.htmlspecialchars($t['href']).'">';
1939
1940     // Lazy image
1941     $html.='<img class="b-lazy" src="#" data-src="'.htmlspecialchars($t['src']).'"';
1942
1943     if (!empty($t['width']))  $html.=' width="'.htmlspecialchars($t['width']).'"';
1944     if (!empty($t['height'])) $html.=' height="'.htmlspecialchars($t['height']).'"';
1945     if (!empty($t['style']))  $html.=' style="'.htmlspecialchars($t['style']).'"';
1946     if (!empty($t['alt']))    $html.=' alt="'.htmlspecialchars($t['alt']).'"';
1947     $html.='>';
1948
1949     // No-JavaScript fallback.
1950     $html.='<noscript><img src="'.htmlspecialchars($t['src']).'"';
1951     if (!empty($t['width']))  $html.=' width="'.htmlspecialchars($t['width']).'"';
1952     if (!empty($t['height'])) $html.=' height="'.htmlspecialchars($t['height']).'"';
1953     if (!empty($t['style']))  $html.=' style="'.htmlspecialchars($t['style']).'"';
1954     if (!empty($t['alt']))    $html.=' alt="'.htmlspecialchars($t['alt']).'"';
1955     $html.='></noscript></a>';
1956
1957     return $html;
1958 }
1959
1960
1961 // -----------------------------------------------------------------------------------------------
1962 // Installation
1963 // This function should NEVER be called if the file data/config.php exists.
1964 function install()
1965 {
1966     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
1967     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
1968
1969
1970     // This part makes sure sessions works correctly.
1971     // (Because on some hosts, session.save_path may not be set correctly,
1972     // or we may not have write access to it.)
1973     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
1974     {   // Step 2: Check if data in session is correct.
1975         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
1976         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
1977         echo 'It currently points to '.session_save_path().'<br>';
1978         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
1979         echo '<br><a href="?">Click to try again.</a></pre>';
1980         die;
1981     }
1982     if (!isset($_SESSION['session_tested']))
1983     {   // Step 1 : Try to store data in session and reload page.
1984         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
1985         header('Location: '.indexUrl().'?test_session');  // Redirect to check stored data.
1986     }
1987     if (isset($_GET['test_session']))
1988     {   // Step 3: Sessions are OK. Remove test parameter from URL.
1989         header('Location: '.indexUrl());
1990     }
1991
1992
1993     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
1994     {
1995         $tz = 'UTC';
1996         if (!empty($_POST['continent']) && !empty($_POST['city']))
1997             if (isTZvalid($_POST['continent'],$_POST['city']))
1998                 $tz = $_POST['continent'].'/'.$_POST['city'];
1999         $GLOBALS['timezone'] = $tz;
2000         // Everything is ok, let's create config file.
2001         $GLOBALS['login'] = $_POST['setlogin'];
2002         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2003         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2004         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.htmlspecialchars(indexUrl()) : $_POST['title'] );
2005         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2006         writeConfig();
2007         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2008         exit;
2009     }
2010
2011     // Display config form:
2012     list($timezone_form,$timezone_js) = templateTZform();
2013     $timezone_html=''; if ($timezone_form!='') $timezone_html='<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2014
2015     $PAGE = new pageBuilder;
2016     $PAGE->assign('timezone_html',$timezone_html);
2017     $PAGE->assign('timezone_js',$timezone_js);
2018     $PAGE->renderPage('install');
2019     exit;
2020 }
2021
2022 // Generates the timezone selection form and JavaScript.
2023 // Input: (optional) current timezone (can be 'UTC/UTC'). It will be pre-selected.
2024 // Output: array(html,js)
2025 // Example: list($htmlform,$js) = templateTZform('Europe/Paris');  // Europe/Paris pre-selected.
2026 // Returns array('','') if server does not support timezones list. (e.g. PHP 5.1 on free.fr)
2027 function templateTZform($ptz=false)
2028 {
2029     if (function_exists('timezone_identifiers_list')) // because of old PHP version (5.1) which can be found on free.fr
2030     {
2031         // Try to split the provided timezone.
2032         if ($ptz==false) { $l=timezone_identifiers_list(); $ptz=$l[0]; }
2033         $spos=strpos($ptz,'/'); $pcontinent=substr($ptz,0,$spos); $pcity=substr($ptz,$spos+1);
2034
2035         // Display config form:
2036         $timezone_form = '';
2037         $timezone_js = '';
2038         // The list is in the form "Europe/Paris", "America/Argentina/Buenos_Aires"...
2039         // We split the list in continents/cities.
2040         $continents = array();
2041         $cities = array();
2042         foreach(timezone_identifiers_list() as $tz)
2043         {
2044             if ($tz=='UTC') $tz='UTC/UTC';
2045             $spos = strpos($tz,'/');
2046             if ($spos!==false)
2047             {
2048                 $continent=substr($tz,0,$spos); $city=substr($tz,$spos+1);
2049                 $continents[$continent]=1;
2050                 if (!isset($cities[$continent])) $cities[$continent]='';
2051                 $cities[$continent].='<option value="'.$city.'"'.($pcity==$city?' selected':'').'>'.$city.'</option>';
2052             }
2053         }
2054         $continents_html = '';
2055         $continents = array_keys($continents);
2056         foreach($continents as $continent)
2057             $continents_html.='<option  value="'.$continent.'"'.($pcontinent==$continent?' selected':'').'>'.$continent.'</option>';
2058         $cities_html = $cities[$pcontinent];
2059         $timezone_form = "Continent: <select name=\"continent\" id=\"continent\" onChange=\"onChangecontinent();\">${continents_html}</select>";
2060         $timezone_form .= "&nbsp;&nbsp;&nbsp;&nbsp;City: <select name=\"city\" id=\"city\">${cities[$pcontinent]}</select><br />";
2061         $timezone_js = "<script>";
2062         $timezone_js .= "function onChangecontinent(){document.getElementById(\"city\").innerHTML = citiescontinent[document.getElementById(\"continent\").value];}";
2063         $timezone_js .= "var citiescontinent = ".json_encode($cities).";" ;
2064         $timezone_js .= "</script>" ;
2065         return array($timezone_form,$timezone_js);
2066     }
2067     return array('','');
2068 }
2069
2070 // Tells if a timezone is valid or not.
2071 // If not valid, returns false.
2072 // If system does not support timezone list, returns false.
2073 function isTZvalid($continent,$city)
2074 {
2075     $tz = $continent.'/'.$city;
2076     if (function_exists('timezone_identifiers_list')) // because of old PHP version (5.1) which can be found on free.fr
2077     {
2078         if (in_array($tz, timezone_identifiers_list())) // it's a valid timezone?
2079                     return true;
2080     }
2081     return false;
2082 }
2083 if (!function_exists('json_encode')) {
2084     function json_encode($data) {
2085         switch ($type = gettype($data)) {
2086             case 'NULL':
2087                 return 'null';
2088             case 'boolean':
2089                 return ($data ? 'true' : 'false');
2090             case 'integer':
2091             case 'double':
2092             case 'float':
2093                 return $data;
2094             case 'string':
2095                 return '"' . addslashes($data) . '"';
2096             case 'object':
2097                 $data = get_object_vars($data);
2098             case 'array':
2099                 $output_index_count = 0;
2100                 $output_indexed = array();
2101                 $output_associative = array();
2102                 foreach ($data as $key => $value) {
2103                     $output_indexed[] = json_encode($value);
2104                     $output_associative[] = json_encode($key) . ':' . json_encode($value);
2105                     if ($output_index_count !== NULL && $output_index_count++ !== $key) {
2106                         $output_index_count = NULL;
2107                     }
2108                 }
2109                 if ($output_index_count !== NULL) {
2110                     return '[' . implode(',', $output_indexed) . ']';
2111                 } else {
2112                     return '{' . implode(',', $output_associative) . '}';
2113                 }
2114             default:
2115                 return ''; // Not supported
2116         }
2117     }
2118 }
2119
2120 // Re-write configuration file according to globals.
2121 // Requires some $GLOBALS to be set (login,hash,salt,title).
2122 // If the config file cannot be saved, an error message is displayed and the user is redirected to "Tools" menu.
2123 // (otherwise, the function simply returns.)
2124 function writeConfig()
2125 {
2126     if (is_file($GLOBALS['config']['CONFIG_FILE']) && !isLoggedIn()) die('You are not authorized to alter config.'); // Only logged in user can alter config.
2127     $config='<?php $GLOBALS[\'login\']='.var_export($GLOBALS['login'],true).'; $GLOBALS[\'hash\']='.var_export($GLOBALS['hash'],true).'; $GLOBALS[\'salt\']='.var_export($GLOBALS['salt'],true).'; ';
2128     $config .='$GLOBALS[\'timezone\']='.var_export($GLOBALS['timezone'],true).'; date_default_timezone_set('.var_export($GLOBALS['timezone'],true).'); $GLOBALS[\'title\']='.var_export($GLOBALS['title'],true).';';
2129     $config .= '$GLOBALS[\'titleLink\']='.var_export($GLOBALS['titleLink'],true).'; ';
2130     $config .= '$GLOBALS[\'redirector\']='.var_export($GLOBALS['redirector'],true).'; ';
2131     $config .= '$GLOBALS[\'disablesessionprotection\']='.var_export($GLOBALS['disablesessionprotection'],true).'; ';
2132     $config .= '$GLOBALS[\'disablejquery\']='.var_export($GLOBALS['disablejquery'],true).'; ';
2133     $config .= '$GLOBALS[\'privateLinkByDefault\']='.var_export($GLOBALS['privateLinkByDefault'],true).'; ';
2134     $config .= '$GLOBALS[\'config\'][\'ENABLE_RSS_PERMALINKS\']='.var_export($GLOBALS['config']['ENABLE_RSS_PERMALINKS'], true).'; ';
2135     $config .= '$GLOBALS[\'config\'][\'ENABLE_UPDATECHECK\']='.var_export($GLOBALS['config']['ENABLE_UPDATECHECK'], true).'; ';
2136     $config .= '$GLOBALS[\'config\'][\'HIDE_PUBLIC_LINKS\']='.var_export($GLOBALS['config']['HIDE_PUBLIC_LINKS'], true).'; ';
2137     $config .= ' ?>';
2138     if (!file_put_contents($GLOBALS['config']['CONFIG_FILE'],$config) || strcmp(file_get_contents($GLOBALS['config']['CONFIG_FILE']),$config)!=0)
2139     {
2140         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>';
2141         exit;
2142     }
2143 }
2144
2145 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2146    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2147    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2148    This function is called by passing the URL:
2149    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2150    [URL] is the URL of the link (e.g. a flickr page)
2151    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2152    The function below will fetch the image from the webservice and store it in the cache.
2153 */
2154 function genThumbnail()
2155 {
2156     // Make sure the parameters in the URL were generated by us.
2157     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2158     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2159
2160     // Let's see if we don't already have the image for this URL in the cache.
2161     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2162     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2163     {   // We have the thumbnail, just serve it:
2164         header('Content-Type: image/jpeg');
2165         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2166         return;
2167     }
2168     // We may also serve a blank image (if service did not respond)
2169     $blankname=hash('sha1',$_GET['url']).'.gif';
2170     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2171     {
2172         header('Content-Type: image/gif');
2173         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2174         return;
2175     }
2176
2177     // Otherwise, generate the thumbnail.
2178     $url = $_GET['url'];
2179     $domain = parse_url($url,PHP_URL_HOST);
2180
2181     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2182     {
2183         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2184         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2185
2186         // Is this a link to an image, or to a flickr page ?
2187         $imageurl='';
2188         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2189         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2190             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2191             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2192         }
2193         else // This is a flickr page (html)
2194         {
2195             list($httpstatus,$headers,$data) = getHTTP($url,20); // Get the flickr html page.
2196             if (strpos($httpstatus,'200 OK')!==false)
2197             {
2198                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2199                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!',$data,$matches);
2200                 if (!empty($matches[1])) $imageurl=$matches[1];
2201
2202                 // In albums (and some other pages), the link rel="image_src" is not provided,
2203                 // but flickr provides:
2204                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2205                 if ($imageurl=='')
2206                 {
2207                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!',$data,$matches);
2208                     if (!empty($matches[1])) $imageurl=$matches[1];
2209                 }
2210             }
2211         }
2212
2213         if ($imageurl!='')
2214         {   // Let's download the image.
2215             list($httpstatus,$headers,$data) = getHTTP($imageurl,10); // Image is 240x120, so 10 seconds to download should be enough.
2216             if (strpos($httpstatus,'200 OK')!==false)
2217             {
2218                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2219                 header('Content-Type: image/jpeg');
2220                 echo $data;
2221                 return;
2222             }
2223         }
2224     }
2225
2226     elseif ($domain=='vimeo.com' )
2227     {
2228         // This is more complex: we have to perform a HTTP request, then parse the result.
2229         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2230         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2231         list($httpstatus,$headers,$data) = getHTTP('https://vimeo.com/api/v2/video/'.htmlspecialchars($vid).'.php',5);
2232         if (strpos($httpstatus,'200 OK')!==false)
2233         {
2234             $t = unserialize($data);
2235             $imageurl = $t[0]['thumbnail_medium'];
2236             // Then we download the image and serve it to our client.
2237             list($httpstatus,$headers,$data) = getHTTP($imageurl,10);
2238             if (strpos($httpstatus,'200 OK')!==false)
2239             {
2240                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2241                 header('Content-Type: image/jpeg');
2242                 echo $data;
2243                 return;
2244             }
2245         }
2246     }
2247
2248     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2249     {
2250         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2251         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2252         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2253         list($httpstatus,$headers,$data) = getHTTP($url,5);
2254         if (strpos($httpstatus,'200 OK')!==false)
2255         {
2256             // Extract the link to the thumbnail
2257             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!',$data,$matches);
2258             if (!empty($matches[1]))
2259             {   // Let's download the image.
2260                 $imageurl=$matches[1];
2261                 list($httpstatus,$headers,$data) = getHTTP($imageurl,20); // No control on image size, so wait long enough.
2262                 if (strpos($httpstatus,'200 OK')!==false)
2263                 {
2264                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2265                     file_put_contents($filepath,$data); // Save image to cache.
2266                     if (resizeImage($filepath))
2267                     {
2268                         header('Content-Type: image/jpeg');
2269                         echo file_get_contents($filepath);
2270                         return;
2271                     }
2272                 }
2273             }
2274         }
2275     }
2276
2277     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2278     {
2279         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2280         // http://xkcd.com/327/
2281         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2282         list($httpstatus,$headers,$data) = getHTTP($url,5);
2283         if (strpos($httpstatus,'200 OK')!==false)
2284         {
2285             // Extract the link to the thumbnail
2286             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!',$data,$matches);
2287             if (!empty($matches[1]))
2288             {   // Let's download the image.
2289                 $imageurl=$matches[1];
2290                 list($httpstatus,$headers,$data) = getHTTP($imageurl,20); // No control on image size, so wait long enough.
2291                 if (strpos($httpstatus,'200 OK')!==false)
2292                 {
2293                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2294                     file_put_contents($filepath,$data); // Save image to cache.
2295                     if (resizeImage($filepath))
2296                     {
2297                         header('Content-Type: image/jpeg');
2298                         echo file_get_contents($filepath);
2299                         return;
2300                     }
2301                 }
2302             }
2303         }
2304     }
2305
2306     else
2307     {
2308         // For all other domains, we try to download the image and make a thumbnail.
2309         list($httpstatus,$headers,$data) = getHTTP($url,30);  // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2310         if (strpos($httpstatus,'200 OK')!==false)
2311         {
2312             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2313             file_put_contents($filepath,$data); // Save image to cache.
2314             if (resizeImage($filepath))
2315             {
2316                 header('Content-Type: image/jpeg');
2317                 echo file_get_contents($filepath);
2318                 return;
2319             }
2320         }
2321     }
2322
2323
2324     // Otherwise, return an empty image (8x8 transparent gif)
2325     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2326     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2327     header('Content-Type: image/gif');
2328     echo $blankgif;
2329 }
2330
2331 // Make a thumbnail of the image (to width: 120 pixels)
2332 // Returns true if success, false otherwise.
2333 function resizeImage($filepath)
2334 {
2335     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2336
2337     // Trick: some stupid people rename GIF as JPEG... or else.
2338     // So we really try to open each image type whatever the extension is.
2339     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2340     $im=false;
2341     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2342     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2343     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2344     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2345     $w = imagesx($im);
2346     $h = imagesy($im);
2347     $ystart = 0; $yheight=$h;
2348     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2349     $nw = 120;   // Desired width
2350     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2351     // Resize image:
2352     $im2 = imagecreatetruecolor($nw,$nh);
2353     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2354     imageinterlace($im2,true); // For progressive JPEG.
2355     $tempname=$filepath.'_TEMP.jpg';
2356     imagejpeg($im2, $tempname, 90);
2357     imagedestroy($im);
2358     imagedestroy($im2);
2359     unlink($filepath);
2360     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2361     return true;
2362 }
2363
2364 // Invalidate caches when the database is changed or the user logs out.
2365 // (e.g. tags cache).
2366 function invalidateCaches()
2367 {
2368     unset($_SESSION['tags']);  // Purge cache attached to session.
2369     pageCache::purgeCache();   // Purge page cache shared by sessions.
2370 }
2371
2372 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2373 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2374 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2375 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2376 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=daily')) { showDaily(); exit; }
2377 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2378 renderPage();
2379 ?>