index.php

   1 <?php
   2 // Shaarli 0.0.45beta - Shaare your links...
   3 // The personal, minimalist, super-fast, no-database Delicious clone. By sebsauvage.net
   4 // http://sebsauvage.net/wiki/doku.php?id=php:shaarli
   5 // Licence: http://www.opensource.org/licenses/zlib-license.php
   6 // Requires: PHP 5.1.x  (but autocomplete fields will only work if you have PHP 5.2.x)
   7 // -----------------------------------------------------------------------------------------------
   8 // NEVER TRUST IN PHP.INI
   9 // Some hosts do not define a default timezone in php.ini,
  10 // so we have to do this for avoid the strict standard error.
  11 date_default_timezone_set('UTC');
  12
  13 // -----------------------------------------------------------------------------------------------
  14 // Hardcoded parameter (These parameters can be overwritten by editing the file /data/config.php)
  15 // You should not touch any code below (or at your own risks!)
  16 $GLOBALS['config']['DATADIR'] = 'data'; // Data subdirectory
  17 $GLOBALS['config']['CONFIG_FILE'] = $GLOBALS['config']['DATADIR'].'/config.php'; // Configuration file (user login/password)
  18 $GLOBALS['config']['DATASTORE'] = $GLOBALS['config']['DATADIR'].'/datastore.php'; // Data storage file.
  19 $GLOBALS['config']['LINKS_PER_PAGE'] = 20; // Default links per page.
  20 $GLOBALS['config']['IPBANS_FILENAME'] = $GLOBALS['config']['DATADIR'].'/ipbans.php'; // File storage for failures and bans.
  21 $GLOBALS['config']['BAN_AFTER'] = 4;        // Ban IP after this many failures.
  22 $GLOBALS['config']['BAN_DURATION'] = 1800;  // Ban duration for IP address after login failures (in seconds) (1800 sec. = 30 minutes)
  23 $GLOBALS['config']['OPEN_SHAARLI'] = false; // If true, anyone can add/edit/delete links without having to login
  24 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false; // If true, the moment when links were saved are not shown to users that are not logged in.
  25 $GLOBALS['config']['SHOW_ATOM'] = false; // If true, an extra "ATOM feed" button will be displayed in the toolbar
  26 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true; // Enable thumbnails in links.
  27 $GLOBALS['config']['CACHEDIR'] = 'cache'; // Cache directory for thumbnails for SLOW services (like flickr)
  28 $GLOBALS['config']['PAGECACHE'] = 'pagecache'; // Page cache directory.
  29 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true; // Enable Shaarli to store thumbnail in a local cache. Disable to reduce web space usage.
  30 $GLOBALS['config']['PUBSUBHUB_URL'] = ''; // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
  31 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp/' ; // Raintpl cache directory  (keep the trailing slash!)
  32 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/' ; // Raintpl template directory (keep the trailing slash!)
  33 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt'; // For updates check of Shaarli.
  34 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400 ; // Updates check frequency for Shaarli. 86400 seconds=24 hours
  35                                           // Note: You must have publisher.php in the same directory as Shaarli index.php
  36 $GLOBALS['config']['ARCHIVE_ORG'] = false; // For each link, add a link to an archived version on archive.org
  37 $GLOBALS['config']['ENABLE_RSS_PERMALINKS'] = true;  // Enable RSS permalinks by default. This corresponds to the default behavior of shaarli before this was added as an option.
  38 $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = false;
  39 // -----------------------------------------------------------------------------------------------
  40 define('shaarli_version','0.0.45beta');
  41 // http://server.com/x/shaarli --> /shaarli/
  42 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
  43
  44 // Force cookie path (but do not change lifetime)
  45 $cookie=session_get_cookie_params();
  46 $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
  47 session_set_cookie_params($cookie['lifetime'],$cookiedir,$_SERVER['SERVER_NAME']); // Set default cookie expiration and path.
  48
  49 // Set session parameters on server side.
  50 define('INACTIVITY_TIMEOUT',3600); // (in seconds). If the user does not access any page within this time, his/her session is considered expired.
  51 ini_set('session.use_cookies', 1);       // Use cookies to store session.
  52 ini_set('session.use_only_cookies', 1);  // Force cookies for session (phpsessionID forbidden in URL).
  53 ini_set('session.use_trans_sid', false); // Prevent PHP form using sessionID in URL if cookies are disabled.
  54 session_name('shaarli');
  55 if (session_id() == '') session_start();  // Start session if needed (Some server auto-start sessions).
  56
  57 // PHP Settings
  58 ini_set('max_input_time','60');  // High execution time in case of problematic imports/exports.
  59 ini_set('memory_limit', '128M');  // Try to set max upload file size and read (May not work on some hosts).
  60 ini_set('post_max_size', '16M');
  61 ini_set('upload_max_filesize', '16M');
  62 checkphpversion();
  63 error_reporting(E_ALL^E_WARNING);  // See all error except warnings.
  64 //error_reporting(-1); // See all errors (for debugging only)
  65
  66 // User configuration
  67 if (is_file($GLOBALS['config']['CONFIG_FILE'])) {
  68     require_once $GLOBALS['config']['CONFIG_FILE'];
  69 }
  70
  71 // Shaarli library
  72 require_once 'application/LinkDB.php';
  73 require_once 'application/Utils.php';
  74 require_once 'application/Config.php';
  75
  76 include "inc/rain.tpl.class.php"; //include Rain TPL
  77 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
  78 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
  79
  80 ob_start();  // Output buffering for the page cache.
  81
  82
  83 // In case stupid admin has left magic_quotes enabled in php.ini:
  84 if (get_magic_quotes_gpc())
  85 {
  86     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
  87     $_POST = array_map('stripslashes_deep', $_POST);
  88     $_GET = array_map('stripslashes_deep', $_GET);
  89     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
  90 }
  91
  92 // Prevent caching on client side or proxy: (yes, it's ugly)
  93 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
  94 header("Cache-Control: no-store, no-cache, must-revalidate");
  95 header("Cache-Control: post-check=0, pre-check=0", false);
  96 header("Pragma: no-cache");
  97
  98 // Directories creations (Note that your web host may require different rights than 705.)
  99 if (!is_writable(realpath(dirname(__FILE__)))) die('<pre>ERROR: Shaarli does not have the right to write in its own directory.</pre>');
 100
 101 // Handling of old config file which do not have the new parameters.
 102 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(indexUrl());
 103 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 104 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 105 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 106 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 107 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 108 // I really need to rewrite Shaarli with a proper configuation manager.
 109
 110 // Run config screen if first run:
 111 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 112     install();
 113 }
 114
 115 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 116 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 117 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 118
 119 // a token depending of deployment salt, user password, and the current ip
 120 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 121
 122 autoLocale(); // Sniff browser language and set date format accordingly.
 123 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 124
 125 //==================================================================================================
 126 // Checking session state (i.e. is the user still logged in)
 127 //==================================================================================================
 128
 129 function setup_login_state() {
 130         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 131         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 132         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 133             $userIsLoggedIn = true;
 134         }
 135         if (!isset($GLOBALS['login'])) {
 136             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 137             $loginFailure = true;
 138         }
 139         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 140             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 141             !$loginFailure)
 142         {
 143             fillSessionInfo();
 144             $userIsLoggedIn = true;
 145         }
 146         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 147         if (empty($_SESSION['uid']) ||
 148             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 149             time() >= $_SESSION['expires_on'])
 150         {
 151             logout();
 152             $userIsLoggedIn = false;
 153             $loginFailure = true;
 154         }
 155         if (!empty($_SESSION['longlastingsession'])) {
 156             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 157         }
 158         else {
 159             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 160         }
 161         if (!$loginFailure) {
 162             $userIsLoggedIn = true;
 163         }
 164
 165         return $userIsLoggedIn;
 166 }
 167 //==================================================================================================
 168 $userIsLoggedIn = setup_login_state();
 169 //==================================================================================================
 170 //==================================================================================================
 171
 172 // Check PHP version
 173 function checkphpversion()
 174 {
 175     if (version_compare(PHP_VERSION, '5.1.0') < 0)
 176     {
 177         header('Content-Type: text/plain; charset=utf-8');
 178         echo 'Your PHP version is obsolete! Shaarli requires at least php 5.1.0, and thus cannot run. Sorry. Your PHP version has known security vulnerabilities and should be updated as soon as possible.';
 179         exit;
 180     }
 181 }
 182
 183 // Checks if an update is available for Shaarli.
 184 // (at most once a day, and only for registered user.)
 185 // Output: '' = no new version.
 186 //         other= the available version.
 187 function checkUpdate()
 188 {
 189     if (!isLoggedIn()) return ''; // Do not check versions for visitors.
 190     if (empty($GLOBALS['config']['ENABLE_UPDATECHECK'])) return ''; // Do not check if the user doesn't want to.
 191
 192     // Get latest version number at most once a day.
 193     if (!is_file($GLOBALS['config']['UPDATECHECK_FILENAME']) || (filemtime($GLOBALS['config']['UPDATECHECK_FILENAME'])<time()-($GLOBALS['config']['UPDATECHECK_INTERVAL'])))
 194     {
 195         $version=shaarli_version;
 196         list($httpstatus,$headers,$data) = getHTTP('https://raw.githubusercontent.com/shaarli/Shaarli/master/shaarli_version.php',2);
 197         if (strpos($httpstatus,'200 OK')!==false) $version=str_replace(' */ ?>','',str_replace('<?php /* ','',$data));
 198         // If failed, never mind. We don't want to bother the user with that.
 199         file_put_contents($GLOBALS['config']['UPDATECHECK_FILENAME'],$version); // touch file date
 200     }
 201     // Compare versions:
 202     $newestversion=file_get_contents($GLOBALS['config']['UPDATECHECK_FILENAME']);
 203     if (version_compare($newestversion,shaarli_version)==1) return $newestversion;
 204     return '';
 205 }
 206
 207
 208 // -----------------------------------------------------------------------------------------------
 209 // Simple cache system (mainly for the RSS/ATOM feeds).
 210
 211 class pageCache
 212 {
 213     private $url; // Full URL of the page to cache (typically the value returned by pageUrl())
 214     private $shouldBeCached; // boolean: Should this url be cached?
 215     private $filename; // Name of the cache file for this url.
 216
 217     /*
 218          $url = URL (typically the value returned by pageUrl())
 219          $shouldBeCached = boolean. If false, the cache will be disabled.
 220     */
 221     public function __construct($url,$shouldBeCached)
 222     {
 223         $this->url = $url;
 224         $this->filename = $GLOBALS['config']['PAGECACHE'].'/'.sha1($url).'.cache';
 225         $this->shouldBeCached = $shouldBeCached;
 226     }
 227
 228     // If the page should be cached and a cached version exists,
 229     // returns the cached version (otherwise, return null).
 230     public function cachedVersion()
 231     {
 232         if (!$this->shouldBeCached) return null;
 233         if (is_file($this->filename)) { return file_get_contents($this->filename); exit; }
 234         return null;
 235     }
 236
 237     // Put a page in the cache.
 238     public function cache($page)
 239     {
 240         if (!$this->shouldBeCached) return;
 241         file_put_contents($this->filename,$page);
 242     }
 243
 244     // Purge the whole cache.
 245     // (call with pageCache::purgeCache())
 246     public static function purgeCache()
 247     {
 248         if (is_dir($GLOBALS['config']['PAGECACHE']))
 249         {
 250             $handler = opendir($GLOBALS['config']['PAGECACHE']);
 251             if ($handler!==false)
 252             {
 253                 while (($filename = readdir($handler))!==false)
 254                 {
 255                     if (endsWith($filename,'.cache')) { unlink($GLOBALS['config']['PAGECACHE'].'/'.$filename); }
 256                 }
 257                 closedir($handler);
 258             }
 259         }
 260     }
 261
 262 }
 263
 264
 265 // -----------------------------------------------------------------------------------------------
 266 // Log to text file
 267 function logm($message)
 268 {
 269     $t = strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n";
 270     file_put_contents($GLOBALS['config']['DATADIR'].'/log.txt',$t,FILE_APPEND);
 271 }
 272
 273 // In a string, converts URLs to clickable links.
 274 // Function inspired from http://www.php.net/manual/en/function.preg-replace.php#85722
 275 function text2clickable($url)
 276 {
 277     $redir = empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'];
 278     return preg_replace('!(((?:https?|ftp|file)://|apt:|magnet:)\S+[[:alnum:]]/?)!si','<a href="'.$redir.'$1" rel="nofollow">$1</a>',$url);
 279 }
 280
 281 // This function inserts &nbsp; where relevant so that multiple spaces are properly displayed in HTML
 282 // even in the absence of <pre>  (This is used in description to keep text formatting)
 283 function keepMultipleSpaces($text)
 284 {
 285     return str_replace('  ',' &nbsp;',$text);
 286
 287 }
 288 // ------------------------------------------------------------------------------------------
 289 // Sniff browser language to display dates in the right format automatically.
 290 // (Note that is may not work on your server if the corresponding local is not installed.)
 291 function autoLocale()
 292 {
 293     $attempts = array('en_US'); // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 294     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 295     {   // (It's a bit crude, but it works very well. Preferred language is always presented first.)
 296         if (preg_match('/([a-z]{2})-?([a-z]{2})?/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) {
 297             $loc = $matches[1] . (!empty($matches[2]) ? '_' . strtoupper($matches[2]) : '');
 298             $attempts = array($loc.'.UTF-8', $loc, str_replace('_', '-', $loc).'.UTF-8', str_replace('_', '-', $loc),
 299                 $loc . '_' . strtoupper($loc).'.UTF-8', $loc . '_' . strtoupper($loc),
 300                 $loc . '_' . $loc.'.UTF-8', $loc . '_' . $loc, $loc . '-' . strtoupper($loc).'.UTF-8',
 301                 $loc . '-' . strtoupper($loc), $loc . '-' . $loc.'.UTF-8', $loc . '-' . $loc);
 302         }
 303     }
 304     setlocale(LC_TIME, $attempts);  // LC_TIME = Set local for date/time format only.
 305 }
 306
 307 // ------------------------------------------------------------------------------------------
 308 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 309 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 310 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 311 function pubsubhub()
 312 {
 313     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 314     {
 315        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 316        $topic_url = array (
 317                        indexUrl().'?do=atom',
 318                        indexUrl().'?do=rss'
 319                     );
 320        $p->publish_update($topic_url);
 321     }
 322 }
 323
 324 // ------------------------------------------------------------------------------------------
 325 // Session management
 326
 327 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 328 function allIPs()
 329 {
 330     $ip = $_SERVER["REMOTE_ADDR"];
 331     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 332     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 333     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 334     return $ip;
 335 }
 336
 337 function fillSessionInfo() {
 338         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 339         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 340         $_SESSION['username']=$GLOBALS['login'];
 341         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 342 }
 343
 344 // Check that user/password is correct.
 345 function check_auth($login,$password)
 346 {
 347     $hash = sha1($password.$login.$GLOBALS['salt']);
 348     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 349     {   // Login/password is correct.
 350                 fillSessionInfo();
 351         logm('Login successful');
 352         return True;
 353     }
 354     logm('Login failed for user '.$login);
 355     return False;
 356 }
 357
 358 // Returns true if the user is logged in.
 359 function isLoggedIn()
 360 {
 361     global $userIsLoggedIn;
 362     return $userIsLoggedIn;
 363 }
 364
 365 // Force logout.
 366 function logout() {
 367     if (isset($_SESSION)) {
 368         unset($_SESSION['uid']);
 369         unset($_SESSION['ip']);
 370         unset($_SESSION['username']);
 371         unset($_SESSION['privateonly']);
 372     }
 373     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 374 }
 375
 376
 377 // ------------------------------------------------------------------------------------------
 378 // Brute force protection system
 379 // Several consecutive failed logins will ban the IP address for 30 minutes.
 380 if (!is_file($GLOBALS['config']['IPBANS_FILENAME'])) file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export(array('FAILURES'=>array(),'BANS'=>array()),true).";\n?>");
 381 include $GLOBALS['config']['IPBANS_FILENAME'];
 382 // Signal a failed login. Will ban the IP if too many failures:
 383 function ban_loginFailed()
 384 {
 385     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 386     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 387     $gb['FAILURES'][$ip]++;
 388     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 389     {
 390         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 391         logm('IP address banned from login');
 392     }
 393     $GLOBALS['IPBANS'] = $gb;
 394     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 395 }
 396
 397 // Signals a successful login. Resets failed login counter.
 398 function ban_loginOk()
 399 {
 400     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 401     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 402     $GLOBALS['IPBANS'] = $gb;
 403     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 404 }
 405
 406 // Checks if the user CAN login. If 'true', the user can try to login.
 407 function ban_canLogin()
 408 {
 409     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 410     if (isset($gb['BANS'][$ip]))
 411     {
 412         // User is banned. Check if the ban has expired:
 413         if ($gb['BANS'][$ip]<=time())
 414         {   // Ban expired, user can try to login again.
 415             logm('Ban lifted.');
 416             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 417             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 418             return true; // Ban has expired, user can login.
 419         }
 420         return false; // User is banned.
 421     }
 422     return true; // User is not banned.
 423 }
 424
 425 // ------------------------------------------------------------------------------------------
 426 // Process login form: Check if login/password is correct.
 427 if (isset($_POST['login']))
 428 {
 429     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 430     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 431     {   // Login/password is OK.
 432         ban_loginOk();
 433         // If user wants to keep the session cookie even after the browser closes:
 434         if (!empty($_POST['longlastingsession']))
 435         {
 436                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 437             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 438             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 439
 440             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 441             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 442             // Note: Never forget the trailing slash on the cookie path!
 443             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 444         }
 445         else // Standard session expiration (=when browser closes)
 446         {
 447             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 448             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 449             session_regenerate_id(true);
 450         }
 451         // Optional redirect after login:
 452         if (isset($_GET['post'])) { header('Location: ?post='.urlencode($_GET['post']).(!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').(!empty($_GET['description'])?'&description='.urlencode($_GET['description']):'').(!empty($_GET['source'])?'&source='.urlencode($_GET['source']):'')); exit; }
 453         if (isset($_POST['returnurl']))
 454         {
 455             if (endsWith($_POST['returnurl'],'?do=login')) { header('Location: ?'); exit; } // Prevent loops over login screen.
 456             header('Location: '.$_POST['returnurl']); exit;
 457         }
 458         header('Location: ?'); exit;
 459     }
 460     else
 461     {
 462         ban_loginFailed();
 463         $redir = '';
 464         if (isset($_GET['post'])) { $redir = '&post='.urlencode($_GET['post']).(!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').(!empty($_GET['description'])?'&description='.urlencode($_GET['description']):'').(!empty($_GET['source'])?'&source='.urlencode($_GET['source']):''); }
 465         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 466         exit;
 467     }
 468 }
 469
 470 // ------------------------------------------------------------------------------------------
 471 // Misc utility functions:
 472
 473 // Returns the server URL (including port and http/https), without path.
 474 // e.g. "http://myserver.com:8080"
 475 // You can append $_SERVER['SCRIPT_NAME'] to get the current script URL.
 476 function serverUrl()
 477 {
 478     $https = (!empty($_SERVER['HTTPS']) && (strtolower($_SERVER['HTTPS'])=='on')) || $_SERVER["SERVER_PORT"]=='443'; // HTTPS detection.
 479     $serverport = ($_SERVER["SERVER_PORT"]=='80' || ($https && $_SERVER["SERVER_PORT"]=='443') ? '' : ':'.$_SERVER["SERVER_PORT"]);
 480     return 'http'.($https?'s':'').'://'.$_SERVER['SERVER_NAME'].$serverport;
 481 }
 482
 483 // Returns the absolute URL of current script, without the query.
 484 // (e.g. http://sebsauvage.net/links/)
 485 function indexUrl()
 486 {
 487     $scriptname = $_SERVER["SCRIPT_NAME"];
 488     // If the script is named 'index.php', we remove it (for better looking URLs,
 489     // e.g. http://mysite.com/shaarli/?abcde instead of http://mysite.com/shaarli/index.php?abcde)
 490     if (endswith($scriptname,'index.php')) $scriptname = substr($scriptname,0,strlen($scriptname)-9);
 491     return serverUrl() . $scriptname;
 492 }
 493
 494 // Returns the absolute URL of current script, WITH the query.
 495 // (e.g. http://sebsauvage.net/links/?toto=titi&spamspamspam=humbug)
 496 function pageUrl()
 497 {
 498     return indexUrl().(!empty($_SERVER["QUERY_STRING"]) ? '?'.$_SERVER["QUERY_STRING"] : '');
 499 }
 500
 501 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 502 function return_bytes($val)
 503 {
 504     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 505     switch($last)
 506     {
 507         case 'g': $val *= 1024;
 508         case 'm': $val *= 1024;
 509         case 'k': $val *= 1024;
 510     }
 511     return $val;
 512 }
 513
 514 // Try to determine max file size for uploads (POST).
 515 // Returns an integer (in bytes)
 516 function getMaxFileSize()
 517 {
 518     $size1 = return_bytes(ini_get('post_max_size'));
 519     $size2 = return_bytes(ini_get('upload_max_filesize'));
 520     // Return the smaller of two:
 521     $maxsize = min($size1,$size2);
 522     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 523     return $maxsize;
 524 }
 525
 526 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 527     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 528     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 529 function linkdate2timestamp($linkdate)
 530 {
 531     if(strcmp($linkdate, '_000000') !== 0 || !$linkdate){
 532         $Y=$M=$D=$h=$m=$s=0;
 533         $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 534         return mktime($h,$m,$s,$M,$D,$Y);
 535     }
 536     return time();
 537 }
 538
 539 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 540     (used to build the pubDate attribute in RSS feed.)  */
 541 function linkdate2rfc822($linkdate)
 542 {
 543     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 544 }
 545
 546 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 547     (used to build the updated tags in ATOM feed.)  */
 548 function linkdate2iso8601($linkdate)
 549 {
 550     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 551 }
 552
 553 // Parse HTTP response headers and return an associative array.
 554 function http_parse_headers_shaarli( $headers )
 555 {
 556     $res=array();
 557     foreach($headers as $header)
 558     {
 559         $i = strpos($header,': ');
 560         if ($i!==false)
 561         {
 562             $key=substr($header,0,$i);
 563             $value=substr($header,$i+2,strlen($header)-$i-2);
 564             $res[$key]=$value;
 565         }
 566     }
 567     return $res;
 568 }
 569
 570 /* GET an URL.
 571    Input: $url : URL to get (http://...)
 572           $timeout : Network timeout (will wait this many seconds for an anwser before giving up).
 573    Output: An array.  [0] = HTTP status message (e.g. "HTTP/1.1 200 OK") or error message
 574                       [1] = associative array containing HTTP response headers (e.g. echo getHTTP($url)[1]['Content-Type'])
 575                       [2] = data
 576     Example: list($httpstatus,$headers,$data) = getHTTP('http://sebauvage.net/');
 577              if (strpos($httpstatus,'200 OK')!==false)
 578                  echo 'Data type: '.htmlspecialchars($headers['Content-Type']);
 579              else
 580                  echo 'There was an error: '.htmlspecialchars($httpstatus)
 581 */
 582 function getHTTP($url,$timeout=30)
 583 {
 584     try
 585     {
 586         $options = array('http'=>array('method'=>'GET','timeout' => $timeout, 'user_agent' => 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:23.0) Gecko/20100101 Firefox/23.0')); // Force network timeout
 587         $context = stream_context_create($options);
 588         $data=file_get_contents($url,false,$context,-1, 4000000); // We download at most 4 Mb from source.
 589         if (!$data) { return array('HTTP Error',array(),''); }
 590         $httpStatus=$http_response_header[0]; // e.g. "HTTP/1.1 200 OK"
 591         $responseHeaders=http_parse_headers_shaarli($http_response_header);
 592         return array($httpStatus,$responseHeaders,$data);
 593     }
 594     catch (Exception $e)  // getHTTP *can* fail silently (we don't care if the title cannot be fetched)
 595     {
 596         return array($e->getMessage(),'','');
 597     }
 598 }
 599
 600 // Extract title from an HTML document.
 601 // (Returns an empty string if not found.)
 602 function html_extract_title($html)
 603 {
 604   return preg_match('!<title>(.*?)</title>!is', $html, $matches) ? trim(str_replace("\n",' ', $matches[1])) : '' ;
 605 }
 606
 607 // ------------------------------------------------------------------------------------------
 608 // Token management for XSRF protection
 609 // Token should be used in any form which acts on data (create,update,delete,import...).
 610 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 611
 612 // Returns a token.
 613 function getToken()
 614 {
 615     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 616     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 617     return $rnd;
 618 }
 619
 620 // Tells if a token is OK. Using this function will destroy the token.
 621 // true=token is OK.
 622 function tokenOk($token)
 623 {
 624     if (isset($_SESSION['tokens'][$token]))
 625     {
 626         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 627         return true; // Token is OK.
 628     }
 629     return false; // Wrong token, or already used.
 630 }
 631
 632 // ------------------------------------------------------------------------------------------
 633 /* This class is in charge of building the final page.
 634    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 635    p = new pageBuilder;
 636    p.assign('myfield','myvalue');
 637    p.renderPage('mytemplate');
 638
 639 */
 640 class pageBuilder
 641 {
 642     private $tpl; // RainTPL template
 643
 644     function __construct()
 645     {
 646         $this->tpl=false;
 647     }
 648
 649     private function initialize()
 650     {
 651         $this->tpl = new RainTPL;
 652         $this->tpl->assign('newversion',escape(checkUpdate()));
 653         $this->tpl->assign('feedurl',escape(indexUrl()));
 654         $searchcrits=''; // Search criteria
 655         if (!empty($_GET['searchtags'])) $searchcrits.='&searchtags='.urlencode($_GET['searchtags']);
 656         elseif (!empty($_GET['searchterm'])) $searchcrits.='&searchterm='.urlencode($_GET['searchterm']);
 657         $this->tpl->assign('searchcrits',$searchcrits);
 658         $this->tpl->assign('source',indexUrl());
 659         $this->tpl->assign('version',shaarli_version);
 660         $this->tpl->assign('scripturl',indexUrl());
 661         $this->tpl->assign('pagetitle','Shaarli');
 662         $this->tpl->assign('privateonly',!empty($_SESSION['privateonly'])); // Show only private links?
 663         if (!empty($GLOBALS['title'])) $this->tpl->assign('pagetitle',$GLOBALS['title']);
 664         if (!empty($GLOBALS['titleLink'])) $this->tpl->assign('titleLink',$GLOBALS['titleLink']);
 665         if (!empty($GLOBALS['pagetitle'])) $this->tpl->assign('pagetitle',$GLOBALS['pagetitle']);
 666         $this->tpl->assign('shaarlititle',empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title'] );
 667         return;
 668     }
 669
 670     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 671     public function assign($what,$where)
 672     {
 673         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 674         $this->tpl->assign($what,$where);
 675     }
 676
 677     // Render a specific page (using a template).
 678     // e.g. pb.renderPage('picwall')
 679     public function renderPage($page)
 680     {
 681         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 682         $this->tpl->draw($page);
 683     }
 684 }
 685
 686 // ------------------------------------------------------------------------------------------
 687 // Output the last N links in RSS 2.0 format.
 688 function showRSS()
 689 {
 690     header('Content-Type: application/rss+xml; charset=utf-8');
 691
 692     // $usepermalink : If true, use permalink instead of final link.
 693     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=rss&permalinks
 694     // Also enabled through a config option
 695     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 696
 697     // Cache system
 698     $query = $_SERVER["QUERY_STRING"];
 699     $cache = new pageCache(pageUrl(),startsWith($query,'do=rss') && !isLoggedIn());
 700     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
 701
 702     // If cached was not found (or not usable), then read the database and build the response:
 703     $LINKSDB = new LinkDB(
 704         $GLOBALS['config']['DATASTORE'],
 705         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 706         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 707     );
 708     // Read links from database (and filter private links if user it not logged in).
 709
 710     // Optionally filter the results:
 711     $linksToDisplay=array();
 712     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 713     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 714     else $linksToDisplay = $LINKSDB;
 715
 716     $nblinksToDisplay = 50;  // Number of links to display.
 717     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 718     {
 719         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 720     }
 721
 722     $pageaddr=escape(indexUrl());
 723     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 724     echo '<channel><title>'.$GLOBALS['title'].'</title><link>'.$pageaddr.'</link>';
 725     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 726     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 727     {
 728         echo '<!-- PubSubHubbub Discovery -->';
 729         echo '<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 730         echo '<link rel="self" href="'.$pageaddr.'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 731         echo '<!-- End Of PubSubHubbub Discovery -->';
 732     }
 733     $i=0;
 734     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 735     while ($i<$nblinksToDisplay && $i<count($keys))
 736     {
 737         $link = $linksToDisplay[$keys[$i]];
 738         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 739         $rfc822date = linkdate2rfc822($link['linkdate']);
 740         $absurl = $link['url'];
 741         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 742         if ($usepermalinks===true)
 743             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 744         else
 745             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 746         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.escape($rfc822date)."</pubDate>\n";
 747         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 748         {
 749             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.$pageaddr.'">'.$tag.'</category>'."\n"; }
 750         }
 751
 752         // Add permalink in description
 753         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 754         // If user wants permalinks first, put the final link in description
 755         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 756         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 757         echo '<description><![CDATA['.nl2br(keepMultipleSpaces(text2clickable($link['description']))).$descriptionlink.']]></description>'."\n</item>\n";
 758         $i++;
 759     }
 760     echo '</channel></rss><!-- Cached version of '.escape(pageUrl()).' -->';
 761
 762     $cache->cache(ob_get_contents());
 763     ob_end_flush();
 764     exit;
 765 }
 766
 767 // ------------------------------------------------------------------------------------------
 768 // Output the last N links in ATOM format.
 769 function showATOM()
 770 {
 771     header('Content-Type: application/atom+xml; charset=utf-8');
 772
 773     // $usepermalink : If true, use permalink instead of final link.
 774     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
 775     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 776
 777     // Cache system
 778     $query = $_SERVER["QUERY_STRING"];
 779     $cache = new pageCache(pageUrl(),startsWith($query,'do=atom') && !isLoggedIn());
 780     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
 781     // If cached was not found (or not usable), then read the database and build the response:
 782
 783 // Read links from database (and filter private links if used it not logged in).
 784     $LINKSDB = new LinkDB(
 785         $GLOBALS['config']['DATASTORE'],
 786         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 787         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 788     );
 789
 790     // Optionally filter the results:
 791     $linksToDisplay=array();
 792     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 793     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 794     else $linksToDisplay = $LINKSDB;
 795
 796     $nblinksToDisplay = 50;  // Number of links to display.
 797     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 798     {
 799         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 800     }
 801
 802     $pageaddr=escape(indexUrl());
 803     $latestDate = '';
 804     $entries='';
 805     $i=0;
 806     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 807     while ($i<$nblinksToDisplay && $i<count($keys))
 808     {
 809         $link = $linksToDisplay[$keys[$i]];
 810         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 811         $iso8601date = linkdate2iso8601($link['linkdate']);
 812         $latestDate = max($latestDate,$iso8601date);
 813         $absurl = $link['url'];
 814         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 815         $entries.='<entry><title>'.$link['title'].'</title>';
 816         if ($usepermalinks===true)
 817             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
 818         else
 819             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
 820         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.escape($iso8601date).'</updated>';
 821
 822         // Add permalink in description
 823         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 824         // If user wants permalinks first, put the final link in description
 825         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 826         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 827
 828         $entries.='<content type="html"><![CDATA['.nl2br(keepMultipleSpaces(text2clickable($link['description']))).$descriptionlink."]]></content>\n";
 829         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
 830         {
 831             foreach(explode(' ',$link['tags']) as $tag)
 832                 { $entries.='<category scheme="'.$pageaddr.'" term="'.$tag.'" />'."\n"; }
 833         }
 834         $entries.="</entry>\n";
 835         $i++;
 836     }
 837     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
 838     $feed.='<title>'.$GLOBALS['title'].'</title>';
 839     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.escape($latestDate).'</updated>';
 840     $feed.='<link rel="self" href="'.escape(serverUrl().$_SERVER["REQUEST_URI"]).'" />';
 841     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 842     {
 843         $feed.='<!-- PubSubHubbub Discovery -->';
 844         $feed.='<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
 845         $feed.='<!-- End Of PubSubHubbub Discovery -->';
 846     }
 847     $feed.='<author><name>'.$pageaddr.'</name><uri>'.$pageaddr.'</uri></author>';
 848     $feed.='<id>'.$pageaddr.'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
 849     $feed.=$entries;
 850     $feed.='</feed><!-- Cached version of '.escape(pageUrl()).' -->';
 851     echo $feed;
 852
 853     $cache->cache(ob_get_contents());
 854     ob_end_flush();
 855     exit;
 856 }
 857
 858 // ------------------------------------------------------------------------------------------
 859 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 860 // Gives the last 7 days (which have links).
 861 // This RSS feed cannot be filtered.
 862 function showDailyRSS() {
 863     // Cache system
 864     $query = $_SERVER["QUERY_STRING"];
 865     $cache = new pageCache(pageUrl(), startsWith($query, 'do=dailyrss') && !isLoggedIn());
 866     $cached = $cache->cachedVersion();
 867     if (!empty($cached)) {
 868         echo $cached;
 869         exit;
 870     }
 871
 872     // If cached was not found (or not usable), then read the database and build the response:
 873     // Read links from database (and filter private links if used it not logged in).
 874     $LINKSDB = new LinkDB(
 875         $GLOBALS['config']['DATASTORE'],
 876         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 877         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 878     );
 879
 880     /* Some Shaarlies may have very few links, so we need to look
 881        back in time (rsort()) until we have enough days ($nb_of_days).
 882     */
 883     $linkdates = array();
 884     foreach ($LINKSDB as $linkdate => $value) {
 885         $linkdates[] = $linkdate;
 886     }
 887     rsort($linkdates);
 888     $nb_of_days = 7; // We take 7 days.
 889     $today = Date('Ymd');
 890     $days = array();
 891
 892     foreach ($linkdates as $linkdate) {
 893         $day = substr($linkdate, 0, 8); // Extract day (without time)
 894         if (strcmp($day,$today) < 0) {
 895             if (empty($days[$day])) {
 896                 $days[$day] = array();
 897             }
 898             $days[$day][] = $linkdate;
 899         }
 900
 901         if (count($days) > $nb_of_days) {
 902             break; // Have we collected enough days?
 903         }
 904     }
 905
 906     // Build the RSS feed.
 907     header('Content-Type: application/rss+xml; charset=utf-8');
 908     $pageaddr = escape(indexUrl());
 909     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 910     echo '<channel>';
 911     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 912     echo '<link>'. $pageaddr .'</link>';
 913     echo '<description>Daily shared links</description>';
 914     echo '<language>en-en</language>';
 915     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 916
 917     // For each day.
 918     foreach ($days as $day => $linkdates) {
 919         $daydate = linkdate2timestamp($day.'_000000'); // Full text date
 920         $rfc822date = linkdate2rfc822($day.'_000000');
 921         $absurl = escape(indexUrl().'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 922
 923         // Build the HTML body of this RSS entry.
 924         $html = '';
 925         $href = '';
 926         $links = array();
 927
 928         // We pre-format some fields for proper output.
 929         foreach ($linkdates as $linkdate) {
 930             $l = $LINKSDB[$linkdate];
 931             $l['formatedDescription'] = nl2br(keepMultipleSpaces(text2clickable($l['description'])));
 932             $l['thumbnail'] = thumbnail($l['url']);
 933             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
 934             if (startsWith($l['url'], '?')) {
 935                 $l['url'] = indexUrl() . $l['url'];  // make permalink URL absolute
 936             }
 937             $links[$linkdate] = $l;
 938         }
 939
 940         // Then build the HTML for this day:
 941         $tpl = new RainTPL;
 942         $tpl->assign('title', $GLOBALS['title']);
 943         $tpl->assign('daydate', $daydate);
 944         $tpl->assign('absurl', $absurl);
 945         $tpl->assign('links', $links);
 946         $tpl->assign('rfc822date', escape($rfc822date));
 947         $html = $tpl->draw('dailyrss', $return_string=true);
 948
 949         echo $html . PHP_EOL;
 950     }
 951     echo '</channel></rss><!-- Cached version of '. escape(pageUrl()) .' -->';
 952
 953     $cache->cache(ob_get_contents());
 954     ob_end_flush();
 955     exit;
 956 }
 957
 958 // "Daily" page.
 959 function showDaily()
 960 {
 961     $LINKSDB = new LinkDB(
 962         $GLOBALS['config']['DATASTORE'],
 963         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 964         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 965     );
 966
 967     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 968     if (isset($_GET['day'])) $day=$_GET['day'];
 969
 970     $days = $LINKSDB->days();
 971     $i = array_search($day,$days);
 972     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
 973     $previousday='';
 974     $nextday='';
 975     if ($i!==false)
 976     {
 977         if ($i>=1) $previousday=$days[$i-1];
 978         if ($i<count($days)-1) $nextday=$days[$i+1];
 979     }
 980
 981     try {
 982         $linksToDisplay = $LINKSDB->filterDay($day);
 983     } catch (Exception $exc) {
 984         error_log($exc);
 985         $linksToDisplay = [];
 986     }
 987
 988     // We pre-format some fields for proper output.
 989     foreach($linksToDisplay as $key=>$link)
 990     {
 991
 992         $taglist = explode(' ',$link['tags']);
 993         uasort($taglist, 'strcasecmp');
 994         $linksToDisplay[$key]['taglist']=$taglist;
 995         $linksToDisplay[$key]['formatedDescription']=nl2br(keepMultipleSpaces(text2clickable($link['description'])));
 996         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
 997         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
 998     }
 999
1000     /* We need to spread the articles on 3 columns.
1001        I did not want to use a JavaScript lib like http://masonry.desandro.com/
1002        so I manually spread entries with a simple method: I roughly evaluate the
1003        height of a div according to title and description length.
1004     */
1005     $columns=array(array(),array(),array()); // Entries to display, for each column.
1006     $fill=array(0,0,0);  // Rough estimate of columns fill.
1007     foreach($linksToDisplay as $key=>$link)
1008     {
1009         // Roughly estimate length of entry (by counting characters)
1010         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
1011         // Description: 836 characters gives roughly 342 pixel height.
1012         // This is not perfect, but it's usually OK.
1013         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
1014         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
1015         // Then put in column which is the less filled:
1016         $smallest=min($fill); // find smallest value in array.
1017         $index=array_search($smallest,$fill); // find index of this smallest value.
1018         array_push($columns[$index],$link); // Put entry in this column.
1019         $fill[$index]+=$length;
1020     }
1021     $PAGE = new pageBuilder;
1022     $PAGE->assign('linksToDisplay',$linksToDisplay);
1023     $PAGE->assign('linkcount',count($LINKSDB));
1024     $PAGE->assign('cols', $columns);
1025     $PAGE->assign('day',linkdate2timestamp($day.'_000000'));
1026     $PAGE->assign('previousday',$previousday);
1027     $PAGE->assign('nextday',$nextday);
1028     $PAGE->renderPage('daily');
1029     exit;
1030 }
1031
1032
1033 // ------------------------------------------------------------------------------------------
1034 // Render HTML page (according to URL parameters and user rights)
1035 function renderPage()
1036 {
1037     $LINKSDB = new LinkDB(
1038         $GLOBALS['config']['DATASTORE'],
1039         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
1040         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
1041     );
1042
1043     // -------- Display login form.
1044     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=login'))
1045     {
1046         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1047         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1048         $PAGE = new pageBuilder;
1049         $PAGE->assign('token',$token);
1050         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
1051         $PAGE->renderPage('loginform');
1052         exit;
1053     }
1054     // -------- User wants to logout.
1055     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1056     {
1057         invalidateCaches();
1058         logout();
1059         header('Location: ?');
1060         exit;
1061     }
1062
1063     // -------- Picture wall
1064     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=picwall'))
1065     {
1066         // Optionally filter the results:
1067         $links=array();
1068         if (!empty($_GET['searchterm'])) $links = $LINKSDB->filterFulltext($_GET['searchterm']);
1069         elseif (!empty($_GET['searchtags']))   $links = $LINKSDB->filterTags(trim($_GET['searchtags']));
1070         else $links = $LINKSDB;
1071
1072         $body='';
1073         $linksToDisplay=array();
1074
1075         // Get only links which have a thumbnail.
1076         foreach($links as $link)
1077         {
1078             $permalink='?'.escape(smallhash($link['linkdate']));
1079             $thumb=lazyThumbnail($link['url'],$permalink);
1080             if ($thumb!='') // Only output links which have a thumbnail.
1081             {
1082                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1083                 $linksToDisplay[]=$link; // Add to array.
1084             }
1085         }
1086
1087         $PAGE = new pageBuilder;
1088         $PAGE->assign('linkcount',count($LINKSDB));
1089         $PAGE->assign('linksToDisplay',$linksToDisplay);
1090         $PAGE->renderPage('picwall');
1091         exit;
1092     }
1093
1094     // -------- Tag cloud
1095     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tagcloud'))
1096     {
1097         $tags= $LINKSDB->allTags();
1098
1099         // We sort tags alphabetically, then choose a font size according to count.
1100         // First, find max value.
1101         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1102         ksort($tags);
1103         $tagList=array();
1104         foreach($tags as $key=>$value)
1105         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1106         {
1107             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1108         }
1109         $PAGE = new pageBuilder;
1110         $PAGE->assign('linkcount',count($LINKSDB));
1111         $PAGE->assign('tags',$tagList);
1112         $PAGE->renderPage('tagcloud');
1113         exit;
1114     }
1115
1116     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1117     if (isset($_GET['addtag']))
1118     {
1119         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1120         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1121         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1122
1123         // Check if this tag is already in the search query and ignore it if it is.
1124         // Each tag is always separated by a space
1125         if (isset($params['searchtags'])) {
1126             $current_tags = explode(' ', $params['searchtags']);
1127         } else {
1128             $current_tags = array();
1129         }
1130         $addtag = true;
1131         foreach ($current_tags as $value) {
1132             if ($value === $_GET['addtag']) {
1133                 $addtag = false;
1134                 break;
1135             }
1136         }
1137         // Append the tag if necessary
1138         if (empty($params['searchtags'])) {
1139             $params['searchtags'] = trim($_GET['addtag']);
1140         }
1141         else if ($addtag) {
1142             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1143         }
1144
1145         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1146         header('Location: ?'.http_build_query($params));
1147         exit;
1148     }
1149
1150     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1151     if (isset($_GET['removetag']))
1152     {
1153         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1154         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?'); exit; } // In case browser does not send HTTP_REFERER
1155         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1156         if (isset($params['searchtags']))
1157         {
1158             $tags = explode(' ',$params['searchtags']);
1159             $tags=array_diff($tags, array($_GET['removetag'])); // Remove value from array $tags.
1160             if (count($tags)==0) unset($params['searchtags']); else $params['searchtags'] = implode(' ',$tags);
1161             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1162         }
1163         header('Location: ?'.http_build_query($params));
1164         exit;
1165     }
1166
1167     // -------- User wants to change the number of links per page (linksperpage=...)
1168     if (isset($_GET['linksperpage']))
1169     {
1170         if (is_numeric($_GET['linksperpage'])) { $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage'])); }
1171         // Make sure the referrer is Shaarli itself.
1172         $referer = '?';
1173         if (!empty($_SERVER['HTTP_REFERER']) && strcmp(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST),$_SERVER['HTTP_HOST'])==0)
1174             $referer = $_SERVER['HTTP_REFERER'];
1175         header('Location: '.$referer);
1176         exit;
1177     }
1178
1179     // -------- User wants to see only private links (toggle)
1180     if (isset($_GET['privateonly']))
1181     {
1182         if (empty($_SESSION['privateonly']))
1183         {
1184             $_SESSION['privateonly']=1; // See only private links
1185         }
1186         else
1187         {
1188             unset($_SESSION['privateonly']); // See all links
1189         }
1190         // Make sure the referrer is Shaarli itself.
1191         $referer = '?';
1192         if (!empty($_SERVER['HTTP_REFERER']) && strcmp(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST),$_SERVER['HTTP_HOST'])==0)
1193             $referer = $_SERVER['HTTP_REFERER'];
1194         header('Location: '.$referer);
1195         exit;
1196     }
1197
1198     // -------- Handle other actions allowed for non-logged in users:
1199     if (!isLoggedIn())
1200     {
1201         // User tries to post new link but is not logged in:
1202         // Show login screen, then redirect to ?post=...
1203         if (isset($_GET['post']))
1204         {
1205             header('Location: ?do=login&post='.urlencode($_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.
1206             exit;
1207         }
1208
1209                 // Same case as above except that user tried to access ?do=addlink without being logged in
1210                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1211                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1212                         header('Location: ?do=login&post=');
1213                         exit;
1214                 }
1215
1216         $PAGE = new pageBuilder;
1217         buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1218         $PAGE->renderPage('linklist');
1219         exit; // Never remove this one! All operations below are reserved for logged in user.
1220     }
1221
1222     // -------- All other functions are reserved for the registered user:
1223
1224     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1225     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tools'))
1226     {
1227         $PAGE = new pageBuilder;
1228         $PAGE->assign('linkcount',count($LINKSDB));
1229         $PAGE->assign('pageabsaddr',indexUrl());
1230         $PAGE->renderPage('tools');
1231         exit;
1232     }
1233
1234     // -------- User wants to change his/her password.
1235     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changepasswd'))
1236     {
1237         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1238         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1239         {
1240             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1241
1242             // Make sure old password is correct.
1243             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1244             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1245             // Save new password
1246             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1247             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1248             try {
1249                 writeConfig($GLOBALS, isLoggedIn());
1250             }
1251             catch(Exception $e) {
1252                 error_log(
1253                     'ERROR while writing config file after changing password.' . PHP_EOL .
1254                     $e->getMessage()
1255                 );
1256
1257                 // TODO: do not handle exceptions/errors in JS.
1258                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1259                 exit;
1260             }
1261             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1262             exit;
1263         }
1264         else // show the change password form.
1265         {
1266             $PAGE = new pageBuilder;
1267             $PAGE->assign('linkcount',count($LINKSDB));
1268             $PAGE->assign('token',getToken());
1269             $PAGE->renderPage('changepassword');
1270             exit;
1271         }
1272     }
1273
1274     // -------- User wants to change configuration
1275     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=configure'))
1276     {
1277         if (!empty($_POST['title']) )
1278         {
1279             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1280             $tz = 'UTC';
1281             if (!empty($_POST['continent']) && !empty($_POST['city']))
1282                 if (isTZvalid($_POST['continent'],$_POST['city']))
1283                     $tz = $_POST['continent'].'/'.$_POST['city'];
1284             $GLOBALS['timezone'] = $tz;
1285             $GLOBALS['title']=$_POST['title'];
1286             $GLOBALS['titleLink']=$_POST['titleLink'];
1287             $GLOBALS['redirector']=$_POST['redirector'];
1288             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1289             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1290             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1291             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1292             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1293             try {
1294                 writeConfig($GLOBALS, isLoggedIn());
1295             }
1296             catch(Exception $e) {
1297                 error_log(
1298                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1299                     $e->getMessage()
1300                 );
1301
1302                 // TODO: do not handle exceptions/errors in JS.
1303                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1304                 exit;
1305             }
1306             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1307             exit;
1308         }
1309         else // Show the configuration form.
1310         {
1311             $PAGE = new pageBuilder;
1312             $PAGE->assign('linkcount',count($LINKSDB));
1313             $PAGE->assign('token',getToken());
1314             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1315             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1316             list($timezone_form,$timezone_js) = templateTZform($GLOBALS['timezone']);
1317             $PAGE->assign('timezone_form',$timezone_form); // FIXME: Put entire tz form generation in template?
1318             $PAGE->assign('timezone_js',$timezone_js);
1319             $PAGE->renderPage('configure');
1320             exit;
1321         }
1322     }
1323
1324     // -------- User wants to rename a tag or delete it
1325     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changetag'))
1326     {
1327         if (empty($_POST['fromtag']))
1328         {
1329             $PAGE = new pageBuilder;
1330             $PAGE->assign('linkcount',count($LINKSDB));
1331             $PAGE->assign('token',getToken());
1332             $PAGE->assign('tags', $LINKSDB->allTags());
1333             $PAGE->renderPage('changetag');
1334             exit;
1335         }
1336         if (!tokenOk($_POST['token'])) die('Wrong token.');
1337
1338         // Delete a tag:
1339         if (!empty($_POST['deletetag']) && !empty($_POST['fromtag']))
1340         {
1341             $needle=trim($_POST['fromtag']);
1342             $linksToAlter = $LINKSDB->filterTags($needle,true); // True for case-sensitive tag search.
1343             foreach($linksToAlter as $key=>$value)
1344             {
1345                 $tags = explode(' ',trim($value['tags']));
1346                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1347                 $value['tags']=trim(implode(' ',$tags));
1348                 $LINKSDB[$key]=$value;
1349             }
1350             $LINKSDB->savedb(); // Save to disk.
1351             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1352             exit;
1353         }
1354
1355         // Rename a tag:
1356         if (!empty($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag']))
1357         {
1358             $needle=trim($_POST['fromtag']);
1359             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
1360             foreach($linksToAlter as $key=>$value)
1361             {
1362                 $tags = explode(' ',trim($value['tags']));
1363                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1364                 $value['tags']=trim(implode(' ',$tags));
1365                 $LINKSDB[$key]=$value;
1366             }
1367             $LINKSDB->savedb(); // Save to disk.
1368             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1369             exit;
1370         }
1371     }
1372
1373     // -------- User wants to add a link without using the bookmarklet: Show form.
1374     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=addlink'))
1375     {
1376         $PAGE = new pageBuilder;
1377         $PAGE->assign('linkcount',count($LINKSDB));
1378         $PAGE->renderPage('addlink');
1379         exit;
1380     }
1381
1382     // -------- User clicked the "Save" button when editing a link: Save link to database.
1383     if (isset($_POST['save_edit']))
1384     {
1385         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1386         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1387         $tags = implode(' ', array_unique(explode(' ', $tags))); // Remove duplicates.
1388         $linkdate=$_POST['lf_linkdate'];
1389         $url = trim($_POST['lf_url']);
1390         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?') && !startsWith($url,'javascript:'))
1391             $url = 'http://'.$url;
1392         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1393                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1394         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1395         $LINKSDB[$linkdate] = $link;
1396         $LINKSDB->savedb(); // Save to disk.
1397         pubsubhub();
1398
1399         // If we are called from the bookmarklet, we must close the popup:
1400         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1401         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1402         $returnurl .= '#'.smallHash($linkdate);  // Scroll to the link which has been edited.
1403         if (strstr($returnurl, "do=addlink")) { $returnurl = '?'; } //if we come from ?do=addlink, set returnurl to homepage instead
1404         header('Location: '.$returnurl); // After saving the link, redirect to the page the user was on.
1405         exit;
1406     }
1407
1408     // -------- User clicked the "Cancel" button when editing a link.
1409     if (isset($_POST['cancel_edit']))
1410     {
1411         // If we are called from the bookmarklet, we must close the popup:
1412         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1413         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1414         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1415         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1416         exit;
1417     }
1418
1419     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1420     if (isset($_POST['delete_link']))
1421     {
1422         if (!tokenOk($_POST['token'])) die('Wrong token.');
1423         // We do not need to ask for confirmation:
1424         // - confirmation is handled by JavaScript
1425         // - we are protected from XSRF by the token.
1426         $linkdate=$_POST['lf_linkdate'];
1427         unset($LINKSDB[$linkdate]);
1428         $LINKSDB->savedb(); // save to disk
1429
1430         // If we are called from the bookmarklet, we must close the popup:
1431         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1432         // Pick where we're going to redirect
1433         // =============================================================
1434         // Basically, we can't redirect to where we were previously if it was a permalink
1435         // or an edit_link, because it would 404.
1436         // Cases:
1437         //    - /             : nothing in $_GET, redirect to self
1438         //    - /?page        : redirect to self
1439         //    - /?searchterm  : redirect to self (there might be other links)
1440         //    - /?searchtags  : redirect to self
1441         //    - /permalink    : redirect to / (the link does not exist anymore)
1442         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1443         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1444         // redirect is not satisfied, and only then redirect to /
1445         $location = "?";
1446         // Self redirection
1447         if (count($_GET) == 0    ||
1448             isset($_GET['page']) ||
1449             isset($_GET['searchterm']) ||
1450             isset($_GET['searchtags'])) {
1451
1452             if (isset($_POST['returnurl'])) {
1453                 $location = $_POST['returnurl']; // Handle redirects given by the form
1454             }
1455
1456             if ($location === "?" &&
1457                 isset($_SERVER['HTTP_REFERER'])) { // Handle HTTP_REFERER in case we're not coming from the same place.
1458                 $location = $_SERVER['HTTP_REFERER'];
1459             }
1460         }
1461
1462         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1463         exit;
1464     }
1465
1466     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1467     if (isset($_GET['edit_link']))
1468     {
1469         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1470         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1471         $PAGE = new pageBuilder;
1472         $PAGE->assign('linkcount',count($LINKSDB));
1473         $PAGE->assign('link',$link);
1474         $PAGE->assign('link_is_new',false);
1475         $PAGE->assign('token',getToken()); // XSRF protection.
1476         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''));
1477         $PAGE->assign('tags', $LINKSDB->allTags());
1478         $PAGE->renderPage('editlink');
1479         exit;
1480     }
1481
1482     // -------- User want to post a new link: Display link edit form.
1483     if (isset($_GET['post']))
1484     {
1485         $url=$_GET['post'];
1486
1487
1488         // We remove the annoying parameters added by FeedBurner, GoogleFeedProxy, Facebook...
1489         $annoyingpatterns = array('/[\?&]utm_source=[^&]*/',
1490             '/[\?&]utm_campaign=[^&]*/',
1491             '/[\?&]utm_medium=[^&]*/',
1492             '/#xtor=RSS-[^&]*/',
1493             '/[\?&]fb_[^&]*/',
1494             '/[\?&]__scoop[^&]*/',
1495             '/#tk\.rss_all\?/',
1496             '/[\?&]action_ref_map=[^&]*/',
1497             '/[\?&]action_type_map=[^&]*/',
1498             '/[\?&]action_object_map=[^&]*/',
1499             '/[\?&]utm_content=[^&]*/',
1500             '/[\?&]fb=[^&]*/',
1501             '/[\?&]xtor=[^&]*/'
1502             );
1503         foreach($annoyingpatterns as $pattern)
1504         {
1505             $url = preg_replace($pattern, "", $url);
1506         }
1507
1508         $link_is_new = false;
1509         $link = $LINKSDB->getLinkFromUrl($url); // Check if URL is not already in database (in this case, we will edit the existing link)
1510         if (!$link)
1511         {
1512             $link_is_new = true;  // This is a new link
1513             $linkdate = strval(date('Ymd_His'));
1514             $title = (empty($_GET['title']) ? '' : $_GET['title'] ); // Get title if it was provided in URL (by the bookmarklet).
1515             $description = (empty($_GET['description']) ? '' : $_GET['description']); // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1516             $tags = (empty($_GET['tags']) ? '' : $_GET['tags'] ); // Get tags if it was provided in URL
1517             $private = (!empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0); // Get private if it was provided in URL
1518             if (($url!='') && parse_url($url,PHP_URL_SCHEME)=='') $url = 'http://'.$url;
1519             // 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.)
1520             if (empty($title) && parse_url($url,PHP_URL_SCHEME)=='http')
1521             {
1522                 list($status,$headers,$data) = getHTTP($url,4); // Short timeout to keep the application responsive.
1523                 // FIXME: Decode charset according to specified in either 1) HTTP response headers or 2) <head> in html
1524                 if (strpos($status,'200 OK')!==false)
1525                                          {
1526                         // Look for charset in html header.
1527                                                 preg_match('#<meta .*charset=.*>#Usi', $data, $meta);
1528
1529                                                 // If found, extract encoding.
1530                                                 if (!empty($meta[0]))
1531                                                 {
1532                                                         // Get encoding specified in header.
1533                                                         preg_match('#charset="?(.*)"#si', $meta[0], $enc);
1534                                                         // If charset not found, use utf-8.
1535                                                         $html_charset = (!empty($enc[1])) ? strtolower($enc[1]) : 'utf-8';
1536                                                 }
1537                                                 else { $html_charset = 'utf-8'; }
1538
1539                                                 // Extract title
1540                                                 $title = html_extract_title($data);
1541                                                 if (!empty($title))
1542                                                 {
1543                                                         // Re-encode title in utf-8 if necessary.
1544                                                         $title = ($html_charset == 'iso-8859-1') ? utf8_encode($title) : $title;
1545                                                 }
1546                                         }
1547             }
1548             if ($url=='') // In case of empty URL, this is just a text (with a link that points to itself)
1549             {
1550                 $url='?'.smallHash($linkdate);
1551                 $title='Note: ';
1552             }
1553             $link = array('linkdate'=>$linkdate,'title'=>$title,'url'=>$url,'description'=>$description,'tags'=>$tags,'private'=>$private);
1554         }
1555
1556         $PAGE = new pageBuilder;
1557         $PAGE->assign('linkcount',count($LINKSDB));
1558         $PAGE->assign('link',$link);
1559         $PAGE->assign('link_is_new',$link_is_new);
1560         $PAGE->assign('token',getToken()); // XSRF protection.
1561         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : ''));
1562         $PAGE->assign('source',(isset($_GET['source']) ? $_GET['source'] : ''));
1563         $PAGE->assign('tags', $LINKSDB->allTags());
1564         $PAGE->renderPage('editlink');
1565         exit;
1566     }
1567
1568     // -------- Export as Netscape Bookmarks HTML file.
1569     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=export'))
1570     {
1571         if (empty($_GET['what']))
1572         {
1573             $PAGE = new pageBuilder;
1574             $PAGE->assign('linkcount',count($LINKSDB));
1575             $PAGE->renderPage('export');
1576             exit;
1577         }
1578         $exportWhat=$_GET['what'];
1579         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1580
1581         header('Content-Type: text/html; charset=utf-8');
1582         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1583         $currentdate=date('Y/m/d H:i:s');
1584         echo <<<HTML
1585 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1586 <!-- This is an automatically generated file.
1587      It will be read and overwritten.
1588      DO NOT EDIT! -->
1589 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1590 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1591 <TITLE>Bookmarks</TITLE>
1592 <H1>Bookmarks</H1>
1593 HTML;
1594         foreach($LINKSDB as $link)
1595         {
1596             if ($exportWhat=='all' ||
1597                ($exportWhat=='private' && $link['private']!=0) ||
1598                ($exportWhat=='public' && $link['private']==0))
1599             {
1600                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1601                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1602                 echo '>'.$link['title']."</A>\n";
1603                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1604             }
1605         }
1606                 exit;
1607     }
1608
1609     // -------- User is uploading a file for import
1610     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1611     {
1612         // If file is too big, some form field may be missing.
1613         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1614         {
1615             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1616             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1617             exit;
1618         }
1619         if (!tokenOk($_POST['token'])) die('Wrong token.');
1620         importFile();
1621         exit;
1622     }
1623
1624     // -------- Show upload/import dialog:
1625     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=import'))
1626     {
1627         $PAGE = new pageBuilder;
1628         $PAGE->assign('linkcount',count($LINKSDB));
1629         $PAGE->assign('token',getToken());
1630         $PAGE->assign('maxfilesize',getMaxFileSize());
1631         $PAGE->renderPage('import');
1632         exit;
1633     }
1634
1635     // -------- Otherwise, simply display search form and links:
1636     $PAGE = new pageBuilder;
1637     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1638     $PAGE->renderPage('linklist');
1639     exit;
1640 }
1641
1642 // -----------------------------------------------------------------------------------------------
1643 // Process the import file form.
1644 function importFile()
1645 {
1646     if (!(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'])) { die('Not allowed.'); }
1647     $LINKSDB = new LinkDB(
1648         $GLOBALS['config']['DATASTORE'],
1649         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
1650         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
1651     );
1652     $filename=$_FILES['filetoupload']['name'];
1653     $filesize=$_FILES['filetoupload']['size'];
1654     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1655     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1656     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1657     $import_count=0;
1658
1659     // Sniff file type:
1660     $type='unknown';
1661     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1662
1663     // Then import the bookmarks.
1664     if ($type=='netscape')
1665     {
1666         // This is a standard Netscape-style bookmark file.
1667         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1668         foreach(explode('<DT>',$data) as $html) // explode is very fast
1669         {
1670             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1671             $d = explode('<DD>',$html);
1672             if (startswith($d[0],'<A '))
1673             {
1674                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1675                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1676                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1677                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1678                 $raw_add_date=0;
1679                 foreach($matches as $m)
1680                 {
1681                     $attr=$m[1]; $value=$m[2];
1682                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1683                     elseif ($attr=='ADD_DATE')
1684                     {
1685                         $raw_add_date=intval($value);
1686                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1687                     }
1688                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1689                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1690                 }
1691                 if ($link['url']!='')
1692                 {
1693                     if ($private==1) $link['private']=1;
1694                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1695                     if ($dblink==false)
1696                     {  // Link not in database, let's import it...
1697                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1698
1699                        // Make sure date/time is not already used by another link.
1700                        // (Some bookmark files have several different links with the same ADD_DATE)
1701                        // We increment date by 1 second until we find a date which is not used in DB.
1702                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1703                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1704                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1705                        $LINKSDB[$link['linkdate']] = $link;
1706                        $import_count++;
1707                     }
1708                     else // Link already present in database.
1709                     {
1710                         if ($overwrite)
1711                         {   // If overwrite is required, we import link data, except date/time.
1712                             $link['linkdate']=$dblink['linkdate'];
1713                             $LINKSDB[$link['linkdate']] = $link;
1714                             $import_count++;
1715                         }
1716                     }
1717
1718                 }
1719             }
1720         }
1721         $LINKSDB->savedb();
1722
1723         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1724     }
1725     else
1726     {
1727         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1728     }
1729 }
1730
1731 // -----------------------------------------------------------------------------------------------
1732 // Template for the list of links (<div id="linklist">)
1733 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1734 function buildLinkList($PAGE,$LINKSDB)
1735 {
1736     // ---- Filter link database according to parameters
1737     $linksToDisplay=array();
1738     $search_type='';
1739     $search_crits='';
1740     if (isset($_GET['searchterm'])) // Fulltext search
1741     {
1742         $linksToDisplay = $LINKSDB->filterFulltext(trim($_GET['searchterm']));
1743         $search_crits=escape(trim($_GET['searchterm']));
1744         $search_type='fulltext';
1745     }
1746     elseif (isset($_GET['searchtags'])) // Search by tag
1747     {
1748         $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
1749         $search_crits=explode(' ',escape(trim($_GET['searchtags'])));
1750         $search_type='tags';
1751     }
1752     elseif (isset($_SERVER['QUERY_STRING']) && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/',$_SERVER['QUERY_STRING'])) // Detect smallHashes in URL
1753     {
1754         $linksToDisplay = $LINKSDB->filterSmallHash(substr(trim($_SERVER["QUERY_STRING"], '/'),0,6));
1755         if (count($linksToDisplay)==0)
1756         {
1757             header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
1758             echo '<h1>404 Not found.</h1>Oh crap. The link you are trying to reach does not exist or has been deleted.';
1759             echo '<br>You would mind <a href="?">clicking here</a>?';
1760             exit;
1761         }
1762         $search_type='permalink';
1763     }
1764     else
1765         $linksToDisplay = $LINKSDB;  // Otherwise, display without filtering.
1766
1767
1768     // Option: Show only private links
1769     if (!empty($_SESSION['privateonly']))
1770     {
1771         $tmp = array();
1772         foreach($linksToDisplay as $linkdate=>$link)
1773         {
1774             if ($link['private']!=0) $tmp[$linkdate]=$link;
1775         }
1776         $linksToDisplay=$tmp;
1777     }
1778
1779     // ---- Handle paging.
1780     /* Can someone explain to me why you get the following error when using array_keys() on an object which implements the interface ArrayAccess???
1781        "Warning: array_keys() expects parameter 1 to be array, object given in ... "
1782        If my class implements ArrayAccess, why won't array_keys() accept it ?  ( $keys=array_keys($linksToDisplay); )
1783     */
1784     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; } // Stupid and ugly. Thanks PHP.
1785
1786     // If there is only a single link, we change on-the-fly the title of the page.
1787     if (count($linksToDisplay)==1) $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1788
1789     // Select articles according to paging.
1790     $pagecount = ceil(count($keys)/$_SESSION['LINKS_PER_PAGE']);
1791     $pagecount = ($pagecount==0 ? 1 : $pagecount);
1792     $page=( empty($_GET['page']) ? 1 : intval($_GET['page']));
1793     $page = ( $page<1 ? 1 : $page );
1794     $page = ( $page>$pagecount ? $pagecount : $page );
1795     $i = ($page-1)*$_SESSION['LINKS_PER_PAGE']; // Start index.
1796     $end = $i+$_SESSION['LINKS_PER_PAGE'];
1797     $linkDisp=array(); // Links to display
1798     while ($i<$end && $i<count($keys))
1799     {
1800         $link = $linksToDisplay[$keys[$i]];
1801         $link['description']=nl2br(keepMultipleSpaces(text2clickable($link['description'])));
1802         $title=$link['title'];
1803         $classLi =  $i%2!=0 ? '' : 'publicLinkHightLight';
1804         $link['class'] = ($link['private']==0 ? $classLi : 'private');
1805         $link['timestamp']=linkdate2timestamp($link['linkdate']);
1806         $taglist = explode(' ',$link['tags']);
1807         uasort($taglist, 'strcasecmp');
1808         $link['taglist']=$taglist;
1809
1810         if ($link["url"][0] === '?' && // Check for both signs of a note: starting with ? and 7 chars long. I doubt that you'll post any links that look like this.
1811             strlen($link["url"]) === 7) {
1812             $link["url"] = indexUrl() . $link["url"];
1813         }
1814
1815         $linkDisp[$keys[$i]] = $link;
1816         $i++;
1817     }
1818
1819     // Compute paging navigation
1820     $searchterm= ( empty($_GET['searchterm']) ? '' : '&searchterm='.$_GET['searchterm'] );
1821     $searchtags= ( empty($_GET['searchtags']) ? '' : '&searchtags='.$_GET['searchtags'] );
1822     $paging='';
1823     $previous_page_url=''; if ($i!=count($keys)) $previous_page_url='?page='.($page+1).$searchterm.$searchtags;
1824     $next_page_url='';if ($page>1) $next_page_url='?page='.($page-1).$searchterm.$searchtags;
1825
1826     $token = ''; if (isLoggedIn()) $token=getToken();
1827
1828     // Fill all template fields.
1829     $PAGE->assign('linkcount',count($LINKSDB));
1830     $PAGE->assign('previous_page_url',$previous_page_url);
1831     $PAGE->assign('next_page_url',$next_page_url);
1832     $PAGE->assign('page_current',$page);
1833     $PAGE->assign('page_max',$pagecount);
1834     $PAGE->assign('result_count',count($linksToDisplay));
1835     $PAGE->assign('search_type',$search_type);
1836     $PAGE->assign('search_crits',$search_crits);
1837     $PAGE->assign('redirector',empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector']); // Optional redirector URL.
1838     $PAGE->assign('token',$token);
1839     $PAGE->assign('links',$linkDisp);
1840     $PAGE->assign('tags', $LINKSDB->allTags());
1841     return;
1842 }
1843
1844 // Compute the thumbnail for a link.
1845 //
1846 // With a link to the original URL.
1847 // Understands various services (youtube.com...)
1848 // Input: $url = URL for which the thumbnail must be found.
1849 //        $href = if provided, this URL will be followed instead of $url
1850 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1851 // Some of them may be missing.
1852 // Return an empty array if no thumbnail available.
1853 function computeThumbnail($url,$href=false)
1854 {
1855     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
1856     if ($href==false) $href=$url;
1857
1858     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1859     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1860     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1861     $domain = parse_url($url,PHP_URL_HOST);
1862     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1863     {
1864         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1865         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1866                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1867     }
1868     if ($domain=='youtu.be') // Youtube short links
1869     {
1870         $path = parse_url($url,PHP_URL_PATH);
1871         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1872                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1873     }
1874     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1875     {
1876         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1877         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1878                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1879     }
1880
1881     if ($domain=='imgur.com')
1882     {
1883         $path = parse_url($url,PHP_URL_PATH);
1884         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1885         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1886                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1887         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1888                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1889
1890         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1891                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1892     }
1893     if ($domain=='i.imgur.com')
1894     {
1895         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1896         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1897                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1898     }
1899     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1900     {
1901         if (strpos($url,'dailymotion.com/video/')!==false)
1902         {
1903             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1904             return array('src'=>$thumburl,
1905                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1906         }
1907     }
1908     if (endsWith($domain,'.imageshack.us'))
1909     {
1910         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1911         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1912         {
1913             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1914             return array('src'=>$thumburl,
1915                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1916         }
1917     }
1918
1919     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1920     // So we deport the thumbnail generation in order not to slow down page generation
1921     // (and we also cache the thumbnail)
1922
1923     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1924
1925     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1926         || $domain=='vimeo.com'
1927         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1928         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1929     )
1930     {
1931         if ($domain=='vimeo.com')
1932         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1933             $path = parse_url($url,PHP_URL_PATH);
1934             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1935         }
1936         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
1937         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
1938             $path = parse_url($url,PHP_URL_PATH);
1939             if (!preg_match('!/\d+.+?!',$path)) return array();
1940         }
1941         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
1942         {   // Make sure this TED URL points to a video (/talks/...)
1943             $path = parse_url($url,PHP_URL_PATH);
1944             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
1945         }
1946         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1947         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1948                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1949     }
1950
1951     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1952     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1953     // But using the extension will do.
1954     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1955     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1956     {
1957         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1958         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1959                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1960     }
1961     return array(); // No thumbnail.
1962
1963 }
1964
1965
1966 // Returns the HTML code to display a thumbnail for a link
1967 // with a link to the original URL.
1968 // Understands various services (youtube.com...)
1969 // Input: $url = URL for which the thumbnail must be found.
1970 //        $href = if provided, this URL will be followed instead of $url
1971 // Returns '' if no thumbnail available.
1972 function thumbnail($url,$href=false)
1973 {
1974     $t = computeThumbnail($url,$href);
1975     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1976
1977     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
1978     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1979     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1980     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1981     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1982     $html.='></a>';
1983     return $html;
1984 }
1985
1986 // Returns the HTML code to display a thumbnail for a link
1987 // for the picture wall (using lazy image loading)
1988 // Understands various services (youtube.com...)
1989 // Input: $url = URL for which the thumbnail must be found.
1990 //        $href = if provided, this URL will be followed instead of $url
1991 // Returns '' if no thumbnail available.
1992 function lazyThumbnail($url,$href=false)
1993 {
1994     $t = computeThumbnail($url,$href);
1995     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1996
1997     $html='<a href="'.escape($t['href']).'">';
1998
1999     // Lazy image
2000     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
2001
2002     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2003     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2004     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2005     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2006     $html.='>';
2007
2008     // No-JavaScript fallback.
2009     $html.='<noscript><img src="'.escape($t['src']).'"';
2010     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2011     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2012     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2013     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2014     $html.='></noscript></a>';
2015
2016     return $html;
2017 }
2018
2019
2020 // -----------------------------------------------------------------------------------------------
2021 // Installation
2022 // This function should NEVER be called if the file data/config.php exists.
2023 function install()
2024 {
2025     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2026     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2027
2028
2029     // This part makes sure sessions works correctly.
2030     // (Because on some hosts, session.save_path may not be set correctly,
2031     // or we may not have write access to it.)
2032     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2033     {   // Step 2: Check if data in session is correct.
2034         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2035         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2036         echo 'It currently points to '.session_save_path().'<br>';
2037         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2038         echo '<br><a href="?">Click to try again.</a></pre>';
2039         die;
2040     }
2041     if (!isset($_SESSION['session_tested']))
2042     {   // Step 1 : Try to store data in session and reload page.
2043         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2044         header('Location: '.indexUrl().'?test_session');  // Redirect to check stored data.
2045     }
2046     if (isset($_GET['test_session']))
2047     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2048         header('Location: '.indexUrl());
2049     }
2050
2051
2052     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2053     {
2054         $tz = 'UTC';
2055         if (!empty($_POST['continent']) && !empty($_POST['city']))
2056             if (isTZvalid($_POST['continent'],$_POST['city']))
2057                 $tz = $_POST['continent'].'/'.$_POST['city'];
2058         $GLOBALS['timezone'] = $tz;
2059         // Everything is ok, let's create config file.
2060         $GLOBALS['login'] = $_POST['setlogin'];
2061         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2062         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2063         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(indexUrl()) : $_POST['title'] );
2064         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2065         try {
2066             writeConfig($GLOBALS, isLoggedIn());
2067         }
2068         catch(Exception $e) {
2069             error_log(
2070                     'ERROR while writing config file after installation.' . PHP_EOL .
2071                     $e->getMessage()
2072                 );
2073
2074             // TODO: do not handle exceptions/errors in JS.
2075             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2076             exit;
2077         }
2078         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2079         exit;
2080     }
2081
2082     // Display config form:
2083     list($timezone_form,$timezone_js) = templateTZform();
2084     $timezone_html=''; if ($timezone_form!='') $timezone_html='<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2085
2086     $PAGE = new pageBuilder;
2087     $PAGE->assign('timezone_html',$timezone_html);
2088     $PAGE->assign('timezone_js',$timezone_js);
2089     $PAGE->renderPage('install');
2090     exit;
2091 }
2092
2093 // Generates the timezone selection form and JavaScript.
2094 // Input: (optional) current timezone (can be 'UTC/UTC'). It will be pre-selected.
2095 // Output: array(html,js)
2096 // Example: list($htmlform,$js) = templateTZform('Europe/Paris');  // Europe/Paris pre-selected.
2097 // Returns array('','') if server does not support timezones list. (e.g. PHP 5.1 on free.fr)
2098 function templateTZform($ptz=false)
2099 {
2100     if (function_exists('timezone_identifiers_list')) // because of old PHP version (5.1) which can be found on free.fr
2101     {
2102         // Try to split the provided timezone.
2103         if ($ptz==false) { $l=timezone_identifiers_list(); $ptz=$l[0]; }
2104         $spos=strpos($ptz,'/'); $pcontinent=substr($ptz,0,$spos); $pcity=substr($ptz,$spos+1);
2105
2106         // Display config form:
2107         $timezone_form = '';
2108         $timezone_js = '';
2109         // The list is in the form "Europe/Paris", "America/Argentina/Buenos_Aires"...
2110         // We split the list in continents/cities.
2111         $continents = array();
2112         $cities = array();
2113         foreach(timezone_identifiers_list() as $tz)
2114         {
2115             if ($tz=='UTC') $tz='UTC/UTC';
2116             $spos = strpos($tz,'/');
2117             if ($spos!==false)
2118             {
2119                 $continent=substr($tz,0,$spos); $city=substr($tz,$spos+1);
2120                 $continents[$continent]=1;
2121                 if (!isset($cities[$continent])) $cities[$continent]='';
2122                 $cities[$continent].='<option value="'.$city.'"'.($pcity==$city?' selected':'').'>'.$city.'</option>';
2123             }
2124         }
2125         $continents_html = '';
2126         $continents = array_keys($continents);
2127         foreach($continents as $continent)
2128             $continents_html.='<option  value="'.$continent.'"'.($pcontinent==$continent?' selected':'').'>'.$continent.'</option>';
2129         $cities_html = $cities[$pcontinent];
2130         $timezone_form = "Continent: <select name=\"continent\" id=\"continent\" onChange=\"onChangecontinent();\">${continents_html}</select>";
2131         $timezone_form .= "&nbsp;&nbsp;&nbsp;&nbsp;City: <select name=\"city\" id=\"city\">${cities[$pcontinent]}</select><br />";
2132         $timezone_js = "<script>";
2133         $timezone_js .= "function onChangecontinent(){document.getElementById(\"city\").innerHTML = citiescontinent[document.getElementById(\"continent\").value];}";
2134         $timezone_js .= "var citiescontinent = ".json_encode($cities).";" ;
2135         $timezone_js .= "</script>" ;
2136         return array($timezone_form,$timezone_js);
2137     }
2138     return array('','');
2139 }
2140
2141 // Tells if a timezone is valid or not.
2142 // If not valid, returns false.
2143 // If system does not support timezone list, returns false.
2144 function isTZvalid($continent,$city)
2145 {
2146     $tz = $continent.'/'.$city;
2147     if (function_exists('timezone_identifiers_list')) // because of old PHP version (5.1) which can be found on free.fr
2148     {
2149         if (in_array($tz, timezone_identifiers_list())) // it's a valid timezone?
2150                     return true;
2151     }
2152     return false;
2153 }
2154 if (!function_exists('json_encode')) {
2155     function json_encode($data) {
2156         switch ($type = gettype($data)) {
2157             case 'NULL':
2158                 return 'null';
2159             case 'boolean':
2160                 return ($data ? 'true' : 'false');
2161             case 'integer':
2162             case 'double':
2163             case 'float':
2164                 return $data;
2165             case 'string':
2166                 return '"' . addslashes($data) . '"';
2167             case 'object':
2168                 $data = get_object_vars($data);
2169             case 'array':
2170                 $output_index_count = 0;
2171                 $output_indexed = array();
2172                 $output_associative = array();
2173                 foreach ($data as $key => $value) {
2174                     $output_indexed[] = json_encode($value);
2175                     $output_associative[] = json_encode($key) . ':' . json_encode($value);
2176                     if ($output_index_count !== NULL && $output_index_count++ !== $key) {
2177                         $output_index_count = NULL;
2178                     }
2179                 }
2180                 if ($output_index_count !== NULL) {
2181                     return '[' . implode(',', $output_indexed) . ']';
2182                 } else {
2183                     return '{' . implode(',', $output_associative) . '}';
2184                 }
2185             default:
2186                 return ''; // Not supported
2187         }
2188     }
2189 }
2190
2191
2192
2193 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2194    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2195    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2196    This function is called by passing the URL:
2197    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2198    [URL] is the URL of the link (e.g. a flickr page)
2199    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2200    The function below will fetch the image from the webservice and store it in the cache.
2201 */
2202 function genThumbnail()
2203 {
2204     // Make sure the parameters in the URL were generated by us.
2205     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2206     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2207
2208     // Let's see if we don't already have the image for this URL in the cache.
2209     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2210     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2211     {   // We have the thumbnail, just serve it:
2212         header('Content-Type: image/jpeg');
2213         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2214         return;
2215     }
2216     // We may also serve a blank image (if service did not respond)
2217     $blankname=hash('sha1',$_GET['url']).'.gif';
2218     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2219     {
2220         header('Content-Type: image/gif');
2221         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2222         return;
2223     }
2224
2225     // Otherwise, generate the thumbnail.
2226     $url = $_GET['url'];
2227     $domain = parse_url($url,PHP_URL_HOST);
2228
2229     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2230     {
2231         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2232         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2233
2234         // Is this a link to an image, or to a flickr page ?
2235         $imageurl='';
2236         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2237         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2238             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2239             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2240         }
2241         else // This is a flickr page (html)
2242         {
2243             list($httpstatus,$headers,$data) = getHTTP($url,20); // Get the flickr html page.
2244             if (strpos($httpstatus,'200 OK')!==false)
2245             {
2246                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2247                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!',$data,$matches);
2248                 if (!empty($matches[1])) $imageurl=$matches[1];
2249
2250                 // In albums (and some other pages), the link rel="image_src" is not provided,
2251                 // but flickr provides:
2252                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2253                 if ($imageurl=='')
2254                 {
2255                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!',$data,$matches);
2256                     if (!empty($matches[1])) $imageurl=$matches[1];
2257                 }
2258             }
2259         }
2260
2261         if ($imageurl!='')
2262         {   // Let's download the image.
2263             list($httpstatus,$headers,$data) = getHTTP($imageurl,10); // Image is 240x120, so 10 seconds to download should be enough.
2264             if (strpos($httpstatus,'200 OK')!==false)
2265             {
2266                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2267                 header('Content-Type: image/jpeg');
2268                 echo $data;
2269                 return;
2270             }
2271         }
2272     }
2273
2274     elseif ($domain=='vimeo.com' )
2275     {
2276         // This is more complex: we have to perform a HTTP request, then parse the result.
2277         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2278         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2279         list($httpstatus,$headers,$data) = getHTTP('https://vimeo.com/api/v2/video/'.escape($vid).'.php',5);
2280         if (strpos($httpstatus,'200 OK')!==false)
2281         {
2282             $t = unserialize($data);
2283             $imageurl = $t[0]['thumbnail_medium'];
2284             // Then we download the image and serve it to our client.
2285             list($httpstatus,$headers,$data) = getHTTP($imageurl,10);
2286             if (strpos($httpstatus,'200 OK')!==false)
2287             {
2288                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2289                 header('Content-Type: image/jpeg');
2290                 echo $data;
2291                 return;
2292             }
2293         }
2294     }
2295
2296     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2297     {
2298         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2299         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2300         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2301         list($httpstatus,$headers,$data) = getHTTP($url,5);
2302         if (strpos($httpstatus,'200 OK')!==false)
2303         {
2304             // Extract the link to the thumbnail
2305             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!',$data,$matches);
2306             if (!empty($matches[1]))
2307             {   // Let's download the image.
2308                 $imageurl=$matches[1];
2309                 list($httpstatus,$headers,$data) = getHTTP($imageurl,20); // No control on image size, so wait long enough.
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($filepath);
2318                         return;
2319                     }
2320                 }
2321             }
2322         }
2323     }
2324
2325     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2326     {
2327         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2328         // http://xkcd.com/327/
2329         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2330         list($httpstatus,$headers,$data) = getHTTP($url,5);
2331         if (strpos($httpstatus,'200 OK')!==false)
2332         {
2333             // Extract the link to the thumbnail
2334             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!',$data,$matches);
2335             if (!empty($matches[1]))
2336             {   // Let's download the image.
2337                 $imageurl=$matches[1];
2338                 list($httpstatus,$headers,$data) = getHTTP($imageurl,20); // No control on image size, so wait long enough.
2339                 if (strpos($httpstatus,'200 OK')!==false)
2340                 {
2341                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2342                     file_put_contents($filepath,$data); // Save image to cache.
2343                     if (resizeImage($filepath))
2344                     {
2345                         header('Content-Type: image/jpeg');
2346                         echo file_get_contents($filepath);
2347                         return;
2348                     }
2349                 }
2350             }
2351         }
2352     }
2353
2354     else
2355     {
2356         // For all other domains, we try to download the image and make a thumbnail.
2357         list($httpstatus,$headers,$data) = getHTTP($url,30);  // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2358         if (strpos($httpstatus,'200 OK')!==false)
2359         {
2360             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2361             file_put_contents($filepath,$data); // Save image to cache.
2362             if (resizeImage($filepath))
2363             {
2364                 header('Content-Type: image/jpeg');
2365                 echo file_get_contents($filepath);
2366                 return;
2367             }
2368         }
2369     }
2370
2371
2372     // Otherwise, return an empty image (8x8 transparent gif)
2373     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2374     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2375     header('Content-Type: image/gif');
2376     echo $blankgif;
2377 }
2378
2379 // Make a thumbnail of the image (to width: 120 pixels)
2380 // Returns true if success, false otherwise.
2381 function resizeImage($filepath)
2382 {
2383     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2384
2385     // Trick: some stupid people rename GIF as JPEG... or else.
2386     // So we really try to open each image type whatever the extension is.
2387     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2388     $im=false;
2389     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2390     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2391     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2392     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2393     $w = imagesx($im);
2394     $h = imagesy($im);
2395     $ystart = 0; $yheight=$h;
2396     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2397     $nw = 120;   // Desired width
2398     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2399     // Resize image:
2400     $im2 = imagecreatetruecolor($nw,$nh);
2401     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2402     imageinterlace($im2,true); // For progressive JPEG.
2403     $tempname=$filepath.'_TEMP.jpg';
2404     imagejpeg($im2, $tempname, 90);
2405     imagedestroy($im);
2406     imagedestroy($im2);
2407     unlink($filepath);
2408     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2409     return true;
2410 }
2411
2412 // Invalidate caches when the database is changed or the user logs out.
2413 // (e.g. tags cache).
2414 function invalidateCaches()
2415 {
2416     unset($_SESSION['tags']);  // Purge cache attached to session.
2417     pageCache::purgeCache();   // Purge page cache shared by sessions.
2418 }
2419
2420 try {
2421     mergeDeprecatedConfig($GLOBALS, isLoggedIn());
2422 } catch(Exception $e) {
2423     error_log(
2424         'ERROR while merging deprecated options.php file.' . PHP_EOL .
2425         $e->getMessage()
2426     );
2427 }
2428
2429 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2430 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2431 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2432 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2433 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=daily')) { showDaily(); exit; }
2434 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2435 renderPage();
2436 ?>