index.php

   1 <?php
   2 // Shaarli 0.0.45beta - Shaare your links...
   3 // The personal, minimalist, super-fast, no-database Delicious clone. By sebsauvage.net
   4 // http://sebsauvage.net/wiki/doku.php?id=php:shaarli
   5 // Licence: http://www.opensource.org/licenses/zlib-license.php
   6 // Requires: PHP 5.1.x  (but autocomplete fields will only work if you have PHP 5.2.x)
   7 // -----------------------------------------------------------------------------------------------
   8 // NEVER TRUST IN PHP.INI
   9 // Some hosts do not define a default timezone in php.ini,
  10 // so we have to do this for avoid the strict standard error.
  11 date_default_timezone_set('UTC');
  12
  13 // -----------------------------------------------------------------------------------------------
  14 // Hardcoded parameter (These parameters can be overwritten by creating the file /data/options.php)
  15 $GLOBALS['config']['DATADIR'] = 'data'; // Data subdirectory
  16 $GLOBALS['config']['CONFIG_FILE'] = $GLOBALS['config']['DATADIR'].'/config.php'; // Configuration file (user login/password)
  17 $GLOBALS['config']['DATASTORE'] = $GLOBALS['config']['DATADIR'].'/datastore.php'; // Data storage file.
  18 $GLOBALS['config']['LINKS_PER_PAGE'] = 20; // Default links per page.
  19 $GLOBALS['config']['IPBANS_FILENAME'] = $GLOBALS['config']['DATADIR'].'/ipbans.php'; // File storage for failures and bans.
  20 $GLOBALS['config']['BAN_AFTER'] = 4;        // Ban IP after this many failures.
  21 $GLOBALS['config']['BAN_DURATION'] = 1800;  // Ban duration for IP address after login failures (in seconds) (1800 sec. = 30 minutes)
  22 $GLOBALS['config']['OPEN_SHAARLI'] = false; // If true, anyone can add/edit/delete links without having to login
  23 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false; // If true, the moment when links were saved are not shown to users that are not logged in.
  24 $GLOBALS['config']['SHOW_ATOM'] = false; // If true, an extra "ATOM feed" button will be displayed in the toolbar
  25 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true; // Enable thumbnails in links.
  26 $GLOBALS['config']['CACHEDIR'] = 'cache'; // Cache directory for thumbnails for SLOW services (like flickr)
  27 $GLOBALS['config']['PAGECACHE'] = 'pagecache'; // Page cache directory.
  28 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true; // Enable Shaarli to store thumbnail in a local cache. Disable to reduce web space usage.
  29 $GLOBALS['config']['PUBSUBHUB_URL'] = ''; // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
  30 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp/' ; // Raintpl cache directory  (keep the trailing slash!)
  31 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/' ; // Raintpl template directory (keep the trailing slash!)
  32 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt'; // For updates check of Shaarli.
  33 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400 ; // Updates check frequency for Shaarli. 86400 seconds=24 hours
  34                                           // Note: You must have publisher.php in the same directory as Shaarli index.php
  35 $GLOBALS['config']['ARCHIVE_ORG'] = false; // For each link, add a link to an archived version on archive.org
  36 $GLOBALS['config']['ENABLE_RSS_PERMALINKS'] = true;  // Enable RSS permalinks by default. This corresponds to the default behavior of shaarli before this was added as an option.
  37 // -----------------------------------------------------------------------------------------------
  38 // You should not touch below (or at your own risks!)
  39 // Optional config file.
  40 if (is_file($GLOBALS['config']['DATADIR'].'/options.php')) require($GLOBALS['config']['DATADIR'].'/options.php');
  41
  42 define('shaarli_version','0.0.45beta');
  43 define('PHPPREFIX','<?php /* '); // Prefix to encapsulate data in PHP code.
  44 define('PHPSUFFIX',' */ ?>'); // Suffix to encapsulate data in PHP code.
  45 // http://server.com/x/shaarli --> /shaarli/
  46 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
  47
  48 // Force cookie path (but do not change lifetime)
  49 $cookie=session_get_cookie_params();
  50 $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
  51 session_set_cookie_params($cookie['lifetime'],$cookiedir,$_SERVER['SERVER_NAME']); // Set default cookie expiration and path.
  52
  53 // Set session parameters on server side.
  54 define('INACTIVITY_TIMEOUT',3600); // (in seconds). If the user does not access any page within this time, his/her session is considered expired.
  55 ini_set('session.use_cookies', 1);       // Use cookies to store session.
  56 ini_set('session.use_only_cookies', 1);  // Force cookies for session (phpsessionID forbidden in URL).
  57 ini_set('session.use_trans_sid', false); // Prevent PHP form using sessionID in URL if cookies are disabled.
  58 session_name('shaarli');
  59 if (session_id() == '') session_start();  // Start session if needed (Some server auto-start sessions).
  60
  61 // PHP Settings
  62 ini_set('max_input_time','60');  // High execution time in case of problematic imports/exports.
  63 ini_set('memory_limit', '128M');  // Try to set max upload file size and read (May not work on some hosts).
  64 ini_set('post_max_size', '16M');
  65 ini_set('upload_max_filesize', '16M');
  66 checkphpversion();
  67 error_reporting(E_ALL^E_WARNING);  // See all error except warnings.
  68 //error_reporting(-1); // See all errors (for debugging only)
  69
  70 include "inc/rain.tpl.class.php"; //include Rain TPL
  71 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
  72 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
  73
  74 ob_start();  // Output buffering for the page cache.
  75
  76
  77 // In case stupid admin has left magic_quotes enabled in php.ini:
  78 if (get_magic_quotes_gpc())
  79 {
  80     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
  81     $_POST = array_map('stripslashes_deep', $_POST);
  82     $_GET = array_map('stripslashes_deep', $_GET);
  83     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
  84 }
  85
  86 // Prevent caching on client side or proxy: (yes, it's ugly)
  87 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
  88 header("Cache-Control: no-store, no-cache, must-revalidate");
  89 header("Cache-Control: post-check=0, pre-check=0", false);
  90 header("Pragma: no-cache");
  91
  92 // Directories creations (Note that your web host may require different rights than 705.)
  93 if (!is_writable(realpath(dirname(__FILE__)))) die('<pre>ERROR: Shaarli does not have the right to write in its own directory.</pre>');
  94
  95 // Handling of old config file which do not have the new parameters.
  96 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.htmlspecialchars(indexUrl());
  97 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
  98 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
  99 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 100 if (empty($GLOBALS['disablejquery'])) $GLOBALS['disablejquery']=false;
 101 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 102 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 103 // I really need to rewrite Shaarli with a proper configuation manager.
 104
 105 // Run config screen if first run:
 106 if (!is_file($GLOBALS['config']['CONFIG_FILE'])) install();
 107
 108 require $GLOBALS['config']['CONFIG_FILE'];  // Read login/password hash into $GLOBALS.
 109
 110 // a token depending of deployment salt, user password, and the current ip
 111 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 112
 113 autoLocale(); // Sniff browser language and set date format accordingly.
 114 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 115
 116 //==================================================================================================
 117 // Checking session state (i.e. is the user still logged in)
 118 //==================================================================================================
 119
 120 function setup_login_state() {
 121         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 122         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 123         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 124             $userIsLoggedIn = true;
 125         }
 126         if (!isset($GLOBALS['login'])) {
 127             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 128             $loginFailure = true;
 129         }
 130         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 131             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 132             !$loginFailure)
 133         {
 134             fillSessionInfo();
 135             $userIsLoggedIn = true;
 136         }
 137         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 138         if (empty($_SESSION['uid']) ||
 139             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 140             time() >= $_SESSION['expires_on'])
 141         {
 142             logout();
 143             $userIsLoggedIn = false;
 144             $loginFailure = true;
 145         }
 146         if (!empty($_SESSION['longlastingsession'])) {
 147             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 148         }
 149         else {
 150             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 151         }
 152         if (!$loginFailure) {
 153             $userIsLoggedIn = true;
 154         }
 155
 156         return $userIsLoggedIn;
 157 }
 158 //==================================================================================================
 159 $userIsLoggedIn = setup_login_state();
 160 //==================================================================================================
 161 //==================================================================================================
 162
 163 // Check PHP version
 164 function checkphpversion()
 165 {
 166     if (version_compare(PHP_VERSION, '5.1.0') < 0)
 167     {
 168         header('Content-Type: text/plain; charset=utf-8');
 169         echo 'Your PHP version is obsolete! Shaarli requires at least php 5.1.0, and thus cannot run. Sorry. Your PHP version has known security vulnerabilities and should be updated as soon as possible.';
 170         exit;
 171     }
 172 }
 173
 174 // Checks if an update is available for Shaarli.
 175 // (at most once a day, and only for registered user.)
 176 // Output: '' = no new version.
 177 //         other= the available version.
 178 function checkUpdate()
 179 {
 180     if (!isLoggedIn()) return ''; // Do not check versions for visitors.
 181     if (empty($GLOBALS['config']['ENABLE_UPDATECHECK'])) return ''; // Do not check if the user doesn't want to.
 182
 183     // Get latest version number at most once a day.
 184     if (!is_file($GLOBALS['config']['UPDATECHECK_FILENAME']) || (filemtime($GLOBALS['config']['UPDATECHECK_FILENAME'])<time()-($GLOBALS['config']['UPDATECHECK_INTERVAL'])))
 185     {
 186         $version=shaarli_version;
 187         list($httpstatus,$headers,$data) = getHTTP('https://raw.githubusercontent.com/shaarli/Shaarli/master/shaarli_version.php',2);
 188         if (strpos($httpstatus,'200 OK')!==false) $version=str_replace(' */ ?>','',str_replace('<?php /* ','',$data));
 189         // If failed, never mind. We don't want to bother the user with that.
 190         file_put_contents($GLOBALS['config']['UPDATECHECK_FILENAME'],$version); // touch file date
 191     }
 192     // Compare versions:
 193     $newestversion=file_get_contents($GLOBALS['config']['UPDATECHECK_FILENAME']);
 194     if (version_compare($newestversion,shaarli_version)==1) return $newestversion;
 195     return '';
 196 }
 197
 198
 199 // -----------------------------------------------------------------------------------------------
 200 // Simple cache system (mainly for the RSS/ATOM feeds).
 201
 202 class pageCache
 203 {
 204     private $url; // Full URL of the page to cache (typically the value returned by pageUrl())
 205     private $shouldBeCached; // boolean: Should this url be cached?
 206     private $filename; // Name of the cache file for this url.
 207
 208     /*
 209          $url = URL (typically the value returned by pageUrl())
 210          $shouldBeCached = boolean. If false, the cache will be disabled.
 211     */
 212     public function __construct($url,$shouldBeCached)
 213     {
 214         $this->url = $url;
 215         $this->filename = $GLOBALS['config']['PAGECACHE'].'/'.sha1($url).'.cache';
 216         $this->shouldBeCached = $shouldBeCached;
 217     }
 218
 219     // If the page should be cached and a cached version exists,
 220     // returns the cached version (otherwise, return null).
 221     public function cachedVersion()
 222     {
 223         if (!$this->shouldBeCached) return null;
 224         if (is_file($this->filename)) { return file_get_contents($this->filename); exit; }
 225         return null;
 226     }
 227
 228     // Put a page in the cache.
 229     public function cache($page)
 230     {
 231         if (!$this->shouldBeCached) return;
 232         file_put_contents($this->filename,$page);
 233     }
 234
 235     // Purge the whole cache.
 236     // (call with pageCache::purgeCache())
 237     public static function purgeCache()
 238     {
 239         if (is_dir($GLOBALS['config']['PAGECACHE']))
 240         {
 241             $handler = opendir($GLOBALS['config']['PAGECACHE']);
 242             if ($handler!==false)
 243             {
 244                 while (($filename = readdir($handler))!==false)
 245                 {
 246                     if (endsWith($filename,'.cache')) { unlink($GLOBALS['config']['PAGECACHE'].'/'.$filename); }
 247                 }
 248                 closedir($handler);
 249             }
 250         }
 251     }
 252
 253 }
 254
 255
 256 // -----------------------------------------------------------------------------------------------
 257 // Log to text file
 258 function logm($message)
 259 {
 260     $t = strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n";
 261     file_put_contents($GLOBALS['config']['DATADIR'].'/log.txt',$t,FILE_APPEND);
 262 }
 263
 264 // Same as nl2br(), but escapes < and >
 265 function nl2br_escaped($html)
 266 {
 267     return str_replace('>','&gt;',str_replace('<','&lt;',nl2br($html)));
 268 }
 269
 270 /* Returns the small hash of a string, using RFC 4648 base64url format
 271    e.g. smallHash('20111006_131924') --> yZH23w
 272    Small hashes:
 273      - are unique (well, as unique as crc32, at last)
 274      - are always 6 characters long.
 275      - only use the following characters: a-z A-Z 0-9 - _ @
 276      - are NOT cryptographically secure (they CAN be forged)
 277    In Shaarli, they are used as a tinyurl-like link to individual entries.
 278 */
 279 function smallHash($text)
 280 {
 281     $t = rtrim(base64_encode(hash('crc32',$text,true)),'=');
 282     return strtr($t, '+/', '-_');
 283 }
 284
 285 // In a string, converts URLs to clickable links.
 286 // Function inspired from http://www.php.net/manual/en/function.preg-replace.php#85722
 287 function text2clickable($url)
 288 {
 289     $redir = empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'];
 290     return preg_replace('!(((?:https?|ftp|file)://|apt:|magnet:)\S+[[:alnum:]]/?)!si','<a href="'.$redir.'$1" rel="nofollow">$1</a>',$url);
 291 }
 292
 293 // This function inserts &nbsp; where relevant so that multiple spaces are properly displayed in HTML
 294 // even in the absence of <pre>  (This is used in description to keep text formatting)
 295 function keepMultipleSpaces($text)
 296 {
 297     return str_replace('  ',' &nbsp;',$text);
 298
 299 }
 300 // ------------------------------------------------------------------------------------------
 301 // Sniff browser language to display dates in the right format automatically.
 302 // (Note that is may not work on your server if the corresponding local is not installed.)
 303 function autoLocale()
 304 {
 305     $attempts = array('en_US'); // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 306     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 307     {   // (It's a bit crude, but it works very well. Preferred language is always presented first.)
 308         if (preg_match('/([a-z]{2})-?([a-z]{2})?/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) {
 309             $loc = $matches[1] . (!empty($matches[2]) ? '_' . strtoupper($matches[2]) : '');
 310             $attempts = array($loc, str_replace('_', '-', $loc),
 311                 $loc . '_' . strtoupper($loc), $loc . '_' . $loc,
 312                 $loc . '-' . strtoupper($loc), $loc . '-' . $loc);
 313         }
 314     }
 315     setlocale(LC_TIME, $attempts);  // LC_TIME = Set local for date/time format only.
 316 }
 317
 318 // ------------------------------------------------------------------------------------------
 319 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 320 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 321 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 322 function pubsubhub()
 323 {
 324     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 325     {
 326        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 327        $topic_url = array (
 328                        indexUrl().'?do=atom',
 329                        indexUrl().'?do=rss'
 330                     );
 331        $p->publish_update($topic_url);
 332     }
 333 }
 334
 335 // ------------------------------------------------------------------------------------------
 336 // Session management
 337
 338 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 339 function allIPs()
 340 {
 341     $ip = $_SERVER["REMOTE_ADDR"];
 342     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 343     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 344     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 345     return $ip;
 346 }
 347
 348 function fillSessionInfo() {
 349         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 350         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 351         $_SESSION['username']=$GLOBALS['login'];
 352         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 353 }
 354
 355 // Check that user/password is correct.
 356 function check_auth($login,$password)
 357 {
 358     $hash = sha1($password.$login.$GLOBALS['salt']);
 359     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 360     {   // Login/password is correct.
 361                 fillSessionInfo();
 362         logm('Login successful');
 363         return True;
 364     }
 365     logm('Login failed for user '.$login);
 366     return False;
 367 }
 368
 369 // Returns true if the user is logged in.
 370 function isLoggedIn()
 371 {
 372     global $userIsLoggedIn;
 373     return $userIsLoggedIn;
 374 }
 375
 376 // Force logout.
 377 function logout() {
 378     if (isset($_SESSION)) {
 379         unset($_SESSION['uid']);
 380         unset($_SESSION['ip']);
 381         unset($_SESSION['username']);
 382         unset($_SESSION['privateonly']);
 383     }
 384     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 385 }
 386
 387
 388 // ------------------------------------------------------------------------------------------
 389 // Brute force protection system
 390 // Several consecutive failed logins will ban the IP address for 30 minutes.
 391 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?>");
 392 include $GLOBALS['config']['IPBANS_FILENAME'];
 393 // Signal a failed login. Will ban the IP if too many failures:
 394 function ban_loginFailed()
 395 {
 396     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 397     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 398     $gb['FAILURES'][$ip]++;
 399     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 400     {
 401         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 402         logm('IP address banned from login');
 403     }
 404     $GLOBALS['IPBANS'] = $gb;
 405     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 406 }
 407
 408 // Signals a successful login. Resets failed login counter.
 409 function ban_loginOk()
 410 {
 411     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 412     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 413     $GLOBALS['IPBANS'] = $gb;
 414     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 415 }
 416
 417 // Checks if the user CAN login. If 'true', the user can try to login.
 418 function ban_canLogin()
 419 {
 420     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 421     if (isset($gb['BANS'][$ip]))
 422     {
 423         // User is banned. Check if the ban has expired:
 424         if ($gb['BANS'][$ip]<=time())
 425         {   // Ban expired, user can try to login again.
 426             logm('Ban lifted.');
 427             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 428             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 429             return true; // Ban has expired, user can login.
 430         }
 431         return false; // User is banned.
 432     }
 433     return true; // User is not banned.
 434 }
 435
 436 // ------------------------------------------------------------------------------------------
 437 // Process login form: Check if login/password is correct.
 438 if (isset($_POST['login']))
 439 {
 440     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 441     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 442     {   // Login/password is OK.
 443         ban_loginOk();
 444         // If user wants to keep the session cookie even after the browser closes:
 445         if (!empty($_POST['longlastingsession']))
 446         {
 447                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 448             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 449             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 450
 451             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 452             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 453             // Note: Never forget the trailing slash on the cookie path!
 454             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 455         }
 456         else // Standard session expiration (=when browser closes)
 457         {
 458             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 459             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 460             session_regenerate_id(true);
 461         }
 462         // Optional redirect after login:
 463         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; }
 464         if (isset($_POST['returnurl']))
 465         {
 466             if (endsWith($_POST['returnurl'],'?do=login')) { header('Location: ?'); exit; } // Prevent loops over login screen.
 467             header('Location: '.$_POST['returnurl']); exit;
 468         }
 469         header('Location: ?'); exit;
 470     }
 471     else
 472     {
 473         ban_loginFailed();
 474         $redir = '';
 475         if (isset($_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']):''); }
 476         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 477         exit;
 478     }
 479 }
 480
 481 // ------------------------------------------------------------------------------------------
 482 // Misc utility functions:
 483
 484 // Returns the server URL (including port and http/https), without path.
 485 // e.g. "http://myserver.com:8080"
 486 // You can append $_SERVER['SCRIPT_NAME'] to get the current script URL.
 487 function serverUrl()
 488 {
 489     $https = (!empty($_SERVER['HTTPS']) && (strtolower($_SERVER['HTTPS'])=='on')) || $_SERVER["SERVER_PORT"]=='443'; // HTTPS detection.
 490     $serverport = ($_SERVER["SERVER_PORT"]=='80' || ($https && $_SERVER["SERVER_PORT"]=='443') ? '' : ':'.$_SERVER["SERVER_PORT"]);
 491     return 'http'.($https?'s':'').'://'.$_SERVER['SERVER_NAME'].$serverport;
 492 }
 493
 494 // Returns the absolute URL of current script, without the query.
 495 // (e.g. http://sebsauvage.net/links/)
 496 function indexUrl()
 497 {
 498     $scriptname = $_SERVER["SCRIPT_NAME"];
 499     // If the script is named 'index.php', we remove it (for better looking URLs,
 500     // e.g. http://mysite.com/shaarli/?abcde instead of http://mysite.com/shaarli/index.php?abcde)
 501     if (endswith($scriptname,'index.php')) $scriptname = substr($scriptname,0,strlen($scriptname)-9);
 502     return serverUrl() . $scriptname;
 503 }
 504
 505 // Returns the absolute URL of current script, WITH the query.
 506 // (e.g. http://sebsauvage.net/links/?toto=titi&spamspamspam=humbug)
 507 function pageUrl()
 508 {
 509     return indexUrl().(!empty($_SERVER["QUERY_STRING"]) ? '?'.$_SERVER["QUERY_STRING"] : '');
 510 }
 511
 512 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 513 function return_bytes($val)
 514 {
 515     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 516     switch($last)
 517     {
 518         case 'g': $val *= 1024;
 519         case 'm': $val *= 1024;
 520         case 'k': $val *= 1024;
 521     }
 522     return $val;
 523 }
 524
 525 // Try to determine max file size for uploads (POST).
 526 // Returns an integer (in bytes)
 527 function getMaxFileSize()
 528 {
 529     $size1 = return_bytes(ini_get('post_max_size'));
 530     $size2 = return_bytes(ini_get('upload_max_filesize'));
 531     // Return the smaller of two:
 532     $maxsize = min($size1,$size2);
 533     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 534     return $maxsize;
 535 }
 536
 537 // Tells if a string start with a substring or not.
 538 function startsWith($haystack,$needle,$case=true)
 539 {
 540     if($case){return (strcmp(substr($haystack, 0, strlen($needle)),$needle)===0);}
 541     return (strcasecmp(substr($haystack, 0, strlen($needle)),$needle)===0);
 542 }
 543
 544 // Tells if a string ends with a substring or not.
 545 function endsWith($haystack,$needle,$case=true)
 546 {
 547     if($case){return (strcmp(substr($haystack, strlen($haystack) - strlen($needle)),$needle)===0);}
 548     return (strcasecmp(substr($haystack, strlen($haystack) - strlen($needle)),$needle)===0);
 549 }
 550
 551 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 552     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 553     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 554 function linkdate2timestamp($linkdate)
 555 {
 556     $Y=$M=$D=$h=$m=$s=0;
 557     sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 558     return mktime($h,$m,$s,$M,$D,$Y);
 559 }
 560
 561 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 562     (used to build the pubDate attribute in RSS feed.)  */
 563 function linkdate2rfc822($linkdate)
 564 {
 565     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 566 }
 567
 568 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 569     (used to build the updated tags in ATOM feed.)  */
 570 function linkdate2iso8601($linkdate)
 571 {
 572     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 573 }
 574
 575 // Parse HTTP response headers and return an associative array.
 576 function http_parse_headers_shaarli( $headers )
 577 {
 578     $res=array();
 579     foreach($headers as $header)
 580     {
 581         $i = strpos($header,': ');
 582         if ($i!==false)
 583         {
 584             $key=substr($header,0,$i);
 585             $value=substr($header,$i+2,strlen($header)-$i-2);
 586             $res[$key]=$value;
 587         }
 588     }
 589     return $res;
 590 }
 591
 592 /* GET an URL.
 593    Input: $url : URL to get (http://...)
 594           $timeout : Network timeout (will wait this many seconds for an anwser before giving up).
 595    Output: An array.  [0] = HTTP status message (e.g. "HTTP/1.1 200 OK") or error message
 596                       [1] = associative array containing HTTP response headers (e.g. echo getHTTP($url)[1]['Content-Type'])
 597                       [2] = data
 598     Example: list($httpstatus,$headers,$data) = getHTTP('http://sebauvage.net/');
 599              if (strpos($httpstatus,'200 OK')!==false)
 600                  echo 'Data type: '.htmlspecialchars($headers['Content-Type']);
 601              else
 602                  echo 'There was an error: '.htmlspecialchars($httpstatus)
 603 */
 604 function getHTTP($url,$timeout=30)
 605 {
 606     try
 607     {
 608         $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
 609         $context = stream_context_create($options);
 610         $data=file_get_contents($url,false,$context,-1, 4000000); // We download at most 4 Mb from source.
 611         if (!$data) { return array('HTTP Error',array(),''); }
 612         $httpStatus=$http_response_header[0]; // e.g. "HTTP/1.1 200 OK"
 613         $responseHeaders=http_parse_headers_shaarli($http_response_header);
 614         return array($httpStatus,$responseHeaders,$data);
 615     }
 616     catch (Exception $e)  // getHTTP *can* fail silently (we don't care if the title cannot be fetched)
 617     {
 618         return array($e->getMessage(),'','');
 619     }
 620 }
 621
 622 // Extract title from an HTML document.
 623 // (Returns an empty string if not found.)
 624 function html_extract_title($html)
 625 {
 626   return preg_match('!<title>(.*?)</title>!is', $html, $matches) ? trim(str_replace("\n",' ', $matches[1])) : '' ;
 627 }
 628
 629 // ------------------------------------------------------------------------------------------
 630 // Token management for XSRF protection
 631 // Token should be used in any form which acts on data (create,update,delete,import...).
 632 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 633
 634 // Returns a token.
 635 function getToken()
 636 {
 637     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 638     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 639     return $rnd;
 640 }
 641
 642 // Tells if a token is OK. Using this function will destroy the token.
 643 // true=token is OK.
 644 function tokenOk($token)
 645 {
 646     if (isset($_SESSION['tokens'][$token]))
 647     {
 648         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 649         return true; // Token is OK.
 650     }
 651     return false; // Wrong token, or already used.
 652 }
 653
 654 // ------------------------------------------------------------------------------------------
 655 /* This class is in charge of building the final page.
 656    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 657    p = new pageBuilder;
 658    p.assign('myfield','myvalue');
 659    p.renderPage('mytemplate');
 660
 661 */
 662 class pageBuilder
 663 {
 664     private $tpl; // RainTPL template
 665
 666     function __construct()
 667     {
 668         $this->tpl=false;
 669     }
 670
 671     private function initialize()
 672     {
 673         $this->tpl = new RainTPL;
 674         $this->tpl->assign('newversion',checkUpdate());
 675         $this->tpl->assign('feedurl',htmlspecialchars(indexUrl()));
 676         $searchcrits=''; // Search criteria
 677         if (!empty($_GET['searchtags'])) $searchcrits.='&searchtags='.urlencode($_GET['searchtags']);
 678         elseif (!empty($_GET['searchterm'])) $searchcrits.='&searchterm='.urlencode($_GET['searchterm']);
 679         $this->tpl->assign('searchcrits',$searchcrits);
 680         $this->tpl->assign('source',indexUrl());
 681         $this->tpl->assign('version',shaarli_version);
 682         $this->tpl->assign('scripturl',indexUrl());
 683         $this->tpl->assign('pagetitle','Shaarli');
 684         $this->tpl->assign('privateonly',!empty($_SESSION['privateonly'])); // Show only private links?
 685         if (!empty($GLOBALS['title'])) $this->tpl->assign('pagetitle',$GLOBALS['title']);
 686         if (!empty($GLOBALS['titleLink'])) $this->tpl->assign('titleLink',$GLOBALS['titleLink']);
 687         if (!empty($GLOBALS['pagetitle'])) $this->tpl->assign('pagetitle',$GLOBALS['pagetitle']);
 688         $this->tpl->assign('shaarlititle',empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title'] );
 689         return;
 690     }
 691
 692     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 693     public function assign($what,$where)
 694     {
 695         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 696         $this->tpl->assign($what,$where);
 697     }
 698
 699     // Render a specific page (using a template).
 700     // e.g. pb.renderPage('picwall')
 701     public function renderPage($page)
 702     {
 703         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 704         $this->tpl->draw($page);
 705     }
 706 }
 707
 708 // ------------------------------------------------------------------------------------------
 709 /* Data storage for links.
 710    This object behaves like an associative array.
 711    Example:
 712       $mylinks = new linkdb();
 713       echo $mylinks['20110826_161819']['title'];
 714       foreach($mylinks as $link)
 715          echo $link['title'].' at url '.$link['url'].' ; description:'.$link['description'];
 716
 717    Available keys:
 718        title : Title of the link
 719        url : URL of the link. Can be absolute or relative. Relative URLs are permalinks (e.g.'?m-ukcw')
 720        description : description of the entry
 721        private : Is this link private? 0=no, other value=yes
 722        linkdate : date of the creation of this entry, in the form YYYYMMDD_HHMMSS (e.g.'20110914_192317')
 723        tags : tags attached to this entry (separated by spaces)
 724
 725    We implement 3 interfaces:
 726      - ArrayAccess so that this object behaves like an associative array.
 727      - Iterator so that this object can be used in foreach() loops.
 728      - Countable interface so that we can do a count() on this object.
 729 */
 730 class linkdb implements Iterator, Countable, ArrayAccess
 731 {
 732     private $links; // List of links (associative array. Key=linkdate (e.g. "20110823_124546"), value= associative array (keys:title,description...)
 733     private $urls;  // List of all recorded URLs (key=url, value=linkdate) for fast reserve search (url-->linkdate)
 734     private $keys;  // List of linkdate keys (for the Iterator interface implementation)
 735     private $position; // Position in the $this->keys array. (for the Iterator interface implementation.)
 736     private $loggedin; // Is the user logged in? (used to filter private links)
 737
 738     // Constructor:
 739     function __construct($isLoggedIn)
 740     // Input : $isLoggedIn : is the user logged in?
 741     {
 742         $this->loggedin = $isLoggedIn;
 743         $this->checkdb(); // Make sure data file exists.
 744         $this->readdb();  // Then read it.
 745     }
 746
 747     // ---- Countable interface implementation
 748     public function count() { return count($this->links); }
 749
 750     // ---- ArrayAccess interface implementation
 751     public function offsetSet($offset, $value)
 752     {
 753         if (!$this->loggedin) die('You are not authorized to add a link.');
 754         if (empty($value['linkdate']) || empty($value['url'])) die('Internal Error: A link should always have a linkdate and URL.');
 755         if (empty($offset)) die('You must specify a key.');
 756         $this->links[$offset] = $value;
 757         $this->urls[$value['url']]=$offset;
 758     }
 759     public function offsetExists($offset) { return array_key_exists($offset,$this->links); }
 760     public function offsetUnset($offset)
 761     {
 762         if (!$this->loggedin) die('You are not authorized to delete a link.');
 763         $url = $this->links[$offset]['url']; unset($this->urls[$url]);
 764         unset($this->links[$offset]);
 765     }
 766     public function offsetGet($offset) { return isset($this->links[$offset]) ? $this->links[$offset] : null; }
 767
 768     // ---- Iterator interface implementation
 769     function rewind() { $this->keys=array_keys($this->links); rsort($this->keys); $this->position=0; } // Start over for iteration, ordered by date (latest first).
 770     function key() { return $this->keys[$this->position]; } // current key
 771     function current() { return $this->links[$this->keys[$this->position]]; } // current value
 772     function next() { ++$this->position; } // go to next item
 773     function valid() { return isset($this->keys[$this->position]); }    // Check if current position is valid.
 774
 775     // ---- Misc methods
 776     private function checkdb() // Check if db directory and file exists.
 777     {
 778         if (!file_exists($GLOBALS['config']['DATASTORE'])) // Create a dummy database for example.
 779         {
 780              $this->links = array();
 781              $link = array('title'=>'Shaarli - sebsauvage.net','url'=>'http://sebsauvage.net/wiki/doku.php?id=php:shaarli','description'=>'Welcome to Shaarli ! This is a bookmark. To edit or delete me, you must first login.','private'=>0,'linkdate'=>'20110914_190000','tags'=>'opensource software');
 782              $this->links[$link['linkdate']] = $link;
 783              $link = array('title'=>'My secret stuff... - Pastebin.com','url'=>'http://sebsauvage.net/paste/?8434b27936c09649#bR7XsXhoTiLcqCpQbmOpBi3rq2zzQUC5hBI7ZT1O3x8=','description'=>'SShhhh!!  I\'m a private link only YOU can see. You can delete me too.','private'=>1,'linkdate'=>'20110914_074522','tags'=>'secretstuff');
 784              $this->links[$link['linkdate']] = $link;
 785              file_put_contents($GLOBALS['config']['DATASTORE'], PHPPREFIX.base64_encode(gzdeflate(serialize($this->links))).PHPSUFFIX); // Write database to disk
 786         }
 787     }
 788
 789     // Read database from disk to memory
 790     private function readdb()
 791     {
 792         // Read data
 793         $this->links=(file_exists($GLOBALS['config']['DATASTORE']) ? unserialize(gzinflate(base64_decode(substr(file_get_contents($GLOBALS['config']['DATASTORE']),strlen(PHPPREFIX),-strlen(PHPSUFFIX))))) : array() );
 794         // Note that gzinflate is faster than gzuncompress. See: http://www.php.net/manual/en/function.gzdeflate.php#96439
 795
 796         // If user is not logged in, filter private links.
 797         if (!$this->loggedin)
 798         {
 799             $toremove=array();
 800             foreach($this->links as $link) { if ($link['private']!=0) $toremove[]=$link['linkdate']; }
 801             foreach($toremove as $linkdate) { unset($this->links[$linkdate]); }
 802         }
 803
 804         // Keep the list of the mapping URLs-->linkdate up-to-date.
 805         $this->urls=array();
 806         foreach($this->links as $link) { $this->urls[$link['url']]=$link['linkdate']; }
 807     }
 808
 809     // Save database from memory to disk.
 810     public function savedb()
 811     {
 812         if (!$this->loggedin) die('You are not authorized to change the database.');
 813         file_put_contents($GLOBALS['config']['DATASTORE'], PHPPREFIX.base64_encode(gzdeflate(serialize($this->links))).PHPSUFFIX);
 814         invalidateCaches();
 815     }
 816
 817     // Returns the link for a given URL (if it exists). False if it does not exist.
 818     public function getLinkFromUrl($url)
 819     {
 820         if (isset($this->urls[$url])) return $this->links[$this->urls[$url]];
 821         return false;
 822     }
 823
 824     // Case insensitive search among links (in the URLs, title and description). Returns filtered list of links.
 825     // e.g. print_r($mydb->filterFulltext('hollandais'));
 826     public function filterFulltext($searchterms)
 827     {
 828         // FIXME: explode(' ',$searchterms) and perform a AND search.
 829         // FIXME: accept double-quotes to search for a string "as is"?
 830         // Using mb_convert_case($val, MB_CASE_LOWER, 'UTF-8') allows us to perform searches on
 831         // Unicode text. See https://github.com/shaarli/Shaarli/issues/75 for examples.
 832         $filtered=array();
 833         $s = mb_convert_case($searchterms, MB_CASE_LOWER, 'UTF-8');
 834         foreach($this->links as $l)
 835         {
 836             $found=   (strpos(mb_convert_case($l['title'],       MB_CASE_LOWER, 'UTF-8'),$s) !== false)
 837                    || (strpos(mb_convert_case($l['description'], MB_CASE_LOWER, 'UTF-8'),$s) !== false)
 838                    || (strpos(mb_convert_case($l['url'],         MB_CASE_LOWER, 'UTF-8'),$s) !== false)
 839                    || (strpos(mb_convert_case($l['tags'],        MB_CASE_LOWER, 'UTF-8'),$s) !== false);
 840             if ($found) $filtered[$l['linkdate']] = $l;
 841         }
 842         krsort($filtered);
 843         return $filtered;
 844     }
 845
 846     // Filter by tag.
 847     // You can specify one or more tags (tags can be separated by space or comma).
 848     // e.g. print_r($mydb->filterTags('linux programming'));
 849     public function filterTags($tags,$casesensitive=false)
 850     {
 851         // Same as above, we use UTF-8 conversion to handle various graphemes (i.e. cyrillic, or greek)
 852         // TODO: is $casesensitive ever true ?
 853         $t = str_replace(',',' ',($casesensitive?$tags:mb_convert_case($tags, MB_CASE_LOWER, 'UTF-8')));
 854         $searchtags=explode(' ',$t);
 855         $filtered=array();
 856         foreach($this->links as $l)
 857         {
 858             $linktags = explode(' ',($casesensitive?$l['tags']:mb_convert_case($l['tags'], MB_CASE_LOWER, 'UTF-8')));
 859             if (count(array_intersect($linktags,$searchtags)) == count($searchtags))
 860                 $filtered[$l['linkdate']] = $l;
 861         }
 862         krsort($filtered);
 863         return $filtered;
 864     }
 865
 866     // Filter by day. Day must be in the form 'YYYYMMDD' (e.g. '20120125')
 867     // Sort order is: older articles first.
 868     // e.g. print_r($mydb->filterDay('20120125'));
 869     public function filterDay($day)
 870     {
 871         $filtered=array();
 872         foreach($this->links as $l)
 873         {
 874             if (startsWith($l['linkdate'],$day)) $filtered[$l['linkdate']] = $l;
 875         }
 876         ksort($filtered);
 877         return $filtered;
 878     }
 879     // Filter by smallHash.
 880     // Only 1 article is returned.
 881     public function filterSmallHash($smallHash)
 882     {
 883         $filtered=array();
 884         foreach($this->links as $l)
 885         {
 886             if ($smallHash==smallHash($l['linkdate'])) // Yes, this is ugly and slow
 887             {
 888                 $filtered[$l['linkdate']] = $l;
 889                 return $filtered;
 890             }
 891         }
 892         return $filtered;
 893     }
 894
 895     // Returns the list of all tags
 896     // Output: associative array key=tags, value=0
 897     public function allTags()
 898     {
 899         $tags=array();
 900         foreach($this->links as $link)
 901             foreach(explode(' ',$link['tags']) as $tag)
 902                 if (!empty($tag)) $tags[$tag]=(empty($tags[$tag]) ? 1 : $tags[$tag]+1);
 903         arsort($tags); // Sort tags by usage (most used tag first)
 904         return $tags;
 905     }
 906
 907     // Returns the list of days containing articles (oldest first)
 908     // Output: An array containing days (in format YYYYMMDD).
 909     public function days()
 910     {
 911         $linkdays=array();
 912         foreach(array_keys($this->links) as $day)
 913         {
 914             $linkdays[substr($day,0,8)]=0;
 915         }
 916         $linkdays=array_keys($linkdays);
 917         sort($linkdays);
 918         return $linkdays;
 919     }
 920 }
 921
 922 // ------------------------------------------------------------------------------------------
 923 // Output the last N links in RSS 2.0 format.
 924 function showRSS()
 925 {
 926     header('Content-Type: application/rss+xml; charset=utf-8');
 927
 928     // $usepermalink : If true, use permalink instead of final link.
 929     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=rss&permalinks
 930     // Also enabled through a config option
 931     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 932
 933     // Cache system
 934     $query = $_SERVER["QUERY_STRING"];
 935     $cache = new pageCache(pageUrl(),startsWith($query,'do=rss') && !isLoggedIn());
 936     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
 937
 938     // If cached was not found (or not usable), then read the database and build the response:
 939     $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if user it not logged in).
 940
 941     // Optionally filter the results:
 942     $linksToDisplay=array();
 943     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 944     elseif (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 945     else $linksToDisplay = $LINKSDB;
 946     $nblinksToDisplay = 50;  // Number of links to display.
 947     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 948     {
 949         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 950     }
 951
 952     $pageaddr=htmlspecialchars(indexUrl());
 953     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 954     echo '<channel><title>'.htmlspecialchars($GLOBALS['title']).'</title><link>'.$pageaddr.'</link>';
 955     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 956     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 957     {
 958         echo '<!-- PubSubHubbub Discovery -->';
 959         echo '<link rel="hub" href="'.htmlspecialchars($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 960         echo '<link rel="self" href="'.htmlspecialchars($pageaddr).'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 961         echo '<!-- End Of PubSubHubbub Discovery -->';
 962     }
 963     $i=0;
 964     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 965     while ($i<$nblinksToDisplay && $i<count($keys))
 966     {
 967         $link = $linksToDisplay[$keys[$i]];
 968         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 969         $rfc822date = linkdate2rfc822($link['linkdate']);
 970         $absurl = htmlspecialchars($link['url']);
 971         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 972         if ($usepermalinks===true)
 973             echo '<item><title>'.htmlspecialchars($link['title']).'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 974         else
 975             echo '<item><title>'.htmlspecialchars($link['title']).'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 976         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.htmlspecialchars($rfc822date)."</pubDate>\n";
 977         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 978         {
 979             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.htmlspecialchars($pageaddr).'">'.htmlspecialchars($tag).'</category>'."\n"; }
 980         }
 981
 982         // Add permalink in description
 983         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 984         // If user wants permalinks first, put the final link in description
 985         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 986         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 987         echo '<description><![CDATA['.nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($link['description'])))).$descriptionlink.']]></description>'."\n</item>\n";
 988         $i++;
 989     }
 990     echo '</channel></rss><!-- Cached version of '.htmlspecialchars(pageUrl()).' -->';
 991
 992     $cache->cache(ob_get_contents());
 993     ob_end_flush();
 994     exit;
 995 }
 996
 997 // ------------------------------------------------------------------------------------------
 998 // Output the last N links in ATOM format.
 999 function showATOM()
1000 {
1001     header('Content-Type: application/atom+xml; charset=utf-8');
1002
1003     // $usepermalink : If true, use permalink instead of final link.
1004     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
1005     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
1006
1007     // Cache system
1008     $query = $_SERVER["QUERY_STRING"];
1009     $cache = new pageCache(pageUrl(),startsWith($query,'do=atom') && !isLoggedIn());
1010     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
1011     // If cached was not found (or not usable), then read the database and build the response:
1012
1013     $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if used it not logged in).
1014
1015
1016     // Optionally filter the results:
1017     $linksToDisplay=array();
1018     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
1019     elseif (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
1020     else $linksToDisplay = $LINKSDB;
1021     $nblinksToDisplay = 50;  // Number of links to display.
1022     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
1023     {
1024         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
1025     }
1026
1027     $pageaddr=htmlspecialchars(indexUrl());
1028     $latestDate = '';
1029     $entries='';
1030     $i=0;
1031     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
1032     while ($i<$nblinksToDisplay && $i<count($keys))
1033     {
1034         $link = $linksToDisplay[$keys[$i]];
1035         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
1036         $iso8601date = linkdate2iso8601($link['linkdate']);
1037         $latestDate = max($latestDate,$iso8601date);
1038         $absurl = htmlspecialchars($link['url']);
1039         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
1040         $entries.='<entry><title>'.htmlspecialchars($link['title']).'</title>';
1041         if ($usepermalinks===true)
1042             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
1043         else
1044             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
1045         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.htmlspecialchars($iso8601date).'</updated>';
1046
1047         // Add permalink in description
1048         $descriptionlink = htmlspecialchars('(<a href="'.$guid.'">Permalink</a>)');
1049         // If user wants permalinks first, put the final link in description
1050         if ($usepermalinks===true) $descriptionlink = htmlspecialchars('(<a href="'.$absurl.'">Link</a>)');
1051         if (strlen($link['description'])>0) $descriptionlink = '&lt;br&gt;'.$descriptionlink;
1052
1053         $entries.='<content type="html">'.htmlspecialchars(nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($link['description']))))).$descriptionlink."</content>\n";
1054         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
1055         {
1056             foreach(explode(' ',$link['tags']) as $tag)
1057                 { $entries.='<category scheme="'.htmlspecialchars($pageaddr,ENT_QUOTES).'" term="'.htmlspecialchars($tag,ENT_QUOTES).'" />'."\n"; }
1058         }
1059         $entries.="</entry>\n";
1060         $i++;
1061     }
1062     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
1063     $feed.='<title>'.htmlspecialchars($GLOBALS['title']).'</title>';
1064     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.htmlspecialchars($latestDate).'</updated>';
1065     $feed.='<link rel="self" href="'.htmlspecialchars(serverUrl().$_SERVER["REQUEST_URI"]).'" />';
1066     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
1067     {
1068         $feed.='<!-- PubSubHubbub Discovery -->';
1069         $feed.='<link rel="hub" href="'.htmlspecialchars($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
1070         $feed.='<!-- End Of PubSubHubbub Discovery -->';
1071     }
1072     $feed.='<author><name>'.htmlspecialchars($pageaddr).'</name><uri>'.htmlspecialchars($pageaddr).'</uri></author>';
1073     $feed.='<id>'.htmlspecialchars($pageaddr).'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
1074     $feed.=$entries;
1075     $feed.='</feed><!-- Cached version of '.htmlspecialchars(pageUrl()).' -->';
1076     echo $feed;
1077
1078     $cache->cache(ob_get_contents());
1079     ob_end_flush();
1080     exit;
1081 }
1082
1083 // ------------------------------------------------------------------------------------------
1084 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
1085 // Gives the last 7 days (which have links).
1086 // This RSS feed cannot be filtered.
1087 function showDailyRSS()
1088 {
1089     // Cache system
1090     $query = $_SERVER["QUERY_STRING"];
1091     $cache = new pageCache(pageUrl(),startsWith($query,'do=dailyrss') && !isLoggedIn());
1092     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
1093     // If cached was not found (or not usable), then read the database and build the response:
1094     $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if used it not logged in).
1095
1096     /* Some Shaarlies may have very few links, so we need to look
1097        back in time (rsort()) until we have enough days ($nb_of_days).
1098     */
1099     $linkdates=array(); foreach($LINKSDB as $linkdate=>$value) { $linkdates[]=$linkdate; }
1100     rsort($linkdates);
1101     $nb_of_days=7; // We take 7 days.
1102     $today=Date('Ymd');
1103     $days=array();
1104     foreach($linkdates as $linkdate)
1105     {
1106         $day=substr($linkdate,0,8); // Extract day (without time)
1107         if (strcmp($day,$today)<0)
1108         {
1109             if (empty($days[$day])) $days[$day]=array();
1110             $days[$day][]=$linkdate;
1111         }
1112         if (count($days)>$nb_of_days) break; // Have we collected enough days?
1113     }
1114
1115     // Build the RSS feed.
1116     header('Content-Type: application/rss+xml; charset=utf-8');
1117     $pageaddr=htmlspecialchars(indexUrl());
1118     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
1119     echo '<channel><title>Daily - '.htmlspecialchars($GLOBALS['title']).'</title><link>'.$pageaddr.'</link>';
1120     echo '<description>Daily shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n";
1121
1122     foreach($days as $day=>$linkdates) // For each day.
1123     {
1124         $daydate = utf8_encode(strftime('%A %d, %B %Y',linkdate2timestamp($day.'_000000'))); // Full text date
1125         $rfc822date = linkdate2rfc822($day.'_000000');
1126         $absurl=htmlspecialchars(indexUrl().'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
1127         echo '<item><title>'.htmlspecialchars($GLOBALS['title'].' - '.$daydate).'</title><guid>'.$absurl.'</guid><link>'.$absurl.'</link>';
1128         echo '<pubDate>'.htmlspecialchars($rfc822date)."</pubDate>";
1129
1130         // Build the HTML body of this RSS entry.
1131         $html='';
1132         $href='';
1133         $links=array();
1134         // We pre-format some fields for proper output.
1135         foreach($linkdates as $linkdate)
1136         {
1137             $l = $LINKSDB[$linkdate];
1138             $l['formatedDescription']=nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($l['description']))));
1139             $l['thumbnail'] = thumbnail($l['url']);
1140             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
1141             if (startsWith($l['url'],'?')) $l['url']=indexUrl().$l['url'];  // make permalink URL absolute
1142             $links[$linkdate]=$l;
1143         }
1144         // Then build the HTML for this day:
1145         $tpl = new RainTPL;
1146         $tpl->assign('links',$links);
1147         $html = $tpl->draw('dailyrss',$return_string=true);
1148         echo "\n";
1149         echo '<description><![CDATA['.$html.']]></description>'."\n</item>\n\n";
1150
1151     }
1152     echo '</channel></rss><!-- Cached version of '.htmlspecialchars(pageUrl()).' -->';
1153
1154     $cache->cache(ob_get_contents());
1155     ob_end_flush();
1156     exit;
1157 }
1158
1159 // "Daily" page.
1160 function showDaily()
1161 {
1162     $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if used it not logged in).
1163
1164
1165     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
1166     if (isset($_GET['day'])) $day=$_GET['day'];
1167
1168     $days = $LINKSDB->days();
1169     $i = array_search($day,$days);
1170     if ($i==false) { $i=count($days)-1; $day=$days[$i]; }
1171     $previousday='';
1172     $nextday='';
1173     if ($i!==false)
1174     {
1175         if ($i>1) $previousday=$days[$i-1];
1176         if ($i<count($days)-1) $nextday=$days[$i+1];
1177     }
1178
1179     $linksToDisplay=$LINKSDB->filterDay($day);
1180     // We pre-format some fields for proper output.
1181     foreach($linksToDisplay as $key=>$link)
1182     {
1183         $taglist = explode(' ',$link['tags']);
1184         uasort($taglist, 'strcasecmp');
1185         $linksToDisplay[$key]['taglist']=$taglist;
1186         $linksToDisplay[$key]['formatedDescription']=nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($link['description']))));
1187         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
1188         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
1189     }
1190
1191     /* We need to spread the articles on 3 columns.
1192        I did not want to use a JavaScript lib like http://masonry.desandro.com/
1193        so I manually spread entries with a simple method: I roughly evaluate the
1194        height of a div according to title and description length.
1195     */
1196     $columns=array(array(),array(),array()); // Entries to display, for each column.
1197     $fill=array(0,0,0);  // Rough estimate of columns fill.
1198     foreach($linksToDisplay as $key=>$link)
1199     {
1200         // Roughly estimate length of entry (by counting characters)
1201         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
1202         // Description: 836 characters gives roughly 342 pixel height.
1203         // This is not perfect, but it's usually OK.
1204         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
1205         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
1206         // Then put in column which is the less filled:
1207         $smallest=min($fill); // find smallest value in array.
1208         $index=array_search($smallest,$fill); // find index of this smallest value.
1209         array_push($columns[$index],$link); // Put entry in this column.
1210         $fill[$index]+=$length;
1211     }
1212     $PAGE = new pageBuilder;
1213     $PAGE->assign('linksToDisplay',$linksToDisplay);
1214     $PAGE->assign('linkcount',count($LINKSDB));
1215     $PAGE->assign('cols', $columns);
1216     $PAGE->assign('day',utf8_encode(strftime('%A %d, %B %Y',linkdate2timestamp($day.'_000000'))));
1217     $PAGE->assign('previousday',$previousday);
1218     $PAGE->assign('nextday',$nextday);
1219     $PAGE->renderPage('daily');
1220     exit;
1221 }
1222
1223
1224 // ------------------------------------------------------------------------------------------
1225 // Render HTML page (according to URL parameters and user rights)
1226 function renderPage()
1227 {
1228     $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if used it not logged in).
1229
1230     // -------- Display login form.
1231     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=login'))
1232     {
1233         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1234         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1235         $PAGE = new pageBuilder;
1236         $PAGE->assign('token',$token);
1237         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER']:''));
1238         $PAGE->renderPage('loginform');
1239         exit;
1240     }
1241     // -------- User wants to logout.
1242     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1243     {
1244         invalidateCaches();
1245         logout();
1246         header('Location: ?');
1247         exit;
1248     }
1249
1250     // -------- Picture wall
1251     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=picwall'))
1252     {
1253         // Optionally filter the results:
1254         $links=array();
1255         if (!empty($_GET['searchterm'])) $links = $LINKSDB->filterFulltext($_GET['searchterm']);
1256         elseif (!empty($_GET['searchtags']))   $links = $LINKSDB->filterTags(trim($_GET['searchtags']));
1257         else $links = $LINKSDB;
1258         $body='';
1259         $linksToDisplay=array();
1260
1261         // Get only links which have a thumbnail.
1262         foreach($links as $link)
1263         {
1264             $permalink='?'.htmlspecialchars(smallhash($link['linkdate']),ENT_QUOTES);
1265             $thumb=lazyThumbnail($link['url'],$permalink);
1266             if ($thumb!='') // Only output links which have a thumbnail.
1267             {
1268                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1269                 $linksToDisplay[]=$link; // Add to array.
1270             }
1271         }
1272         $PAGE = new pageBuilder;
1273         $PAGE->assign('linkcount',count($LINKSDB));
1274         $PAGE->assign('linksToDisplay',$linksToDisplay);
1275         $PAGE->renderPage('picwall');
1276         exit;
1277     }
1278
1279     // -------- Tag cloud
1280     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tagcloud'))
1281     {
1282         $tags= $LINKSDB->allTags();
1283         // We sort tags alphabetically, then choose a font size according to count.
1284         // First, find max value.
1285         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1286         ksort($tags);
1287         $tagList=array();
1288         foreach($tags as $key=>$value)
1289         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1290         {
1291             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1292         }
1293         $PAGE = new pageBuilder;
1294         $PAGE->assign('linkcount',count($LINKSDB));
1295         $PAGE->assign('tags',$tagList);
1296         $PAGE->renderPage('tagcloud');
1297         exit;
1298     }
1299
1300     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1301     if (isset($_GET['addtag']))
1302     {
1303         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1304         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1305         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1306
1307         // Check if this tag is already in the search query and ignore it if it is.
1308         // Each tag is always separated by a space
1309         $current_tags = explode(' ', $params['searchtags']);
1310         $addtag = true;
1311         foreach ($current_tags as $value) {
1312             if ($value === $_GET['addtag']) {
1313                 $addtag = false;
1314                 break;
1315             }
1316         }
1317         // Append the tag if necessary
1318         if (empty($params['searchtags'])) {
1319             $params['searchtags'] = trim($_GET['addtag']);
1320         }
1321         else if ($addtag) {
1322             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1323         }
1324
1325         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1326         header('Location: ?'.http_build_query($params));
1327         exit;
1328     }
1329
1330     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1331     if (isset($_GET['removetag']))
1332     {
1333         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1334         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?'); exit; } // In case browser does not send HTTP_REFERER
1335         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1336         if (isset($params['searchtags']))
1337         {
1338             $tags = explode(' ',$params['searchtags']);
1339             $tags=array_diff($tags, array($_GET['removetag'])); // Remove value from array $tags.
1340             if (count($tags)==0) unset($params['searchtags']); else $params['searchtags'] = implode(' ',$tags);
1341             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1342         }
1343         header('Location: ?'.http_build_query($params));
1344         exit;
1345     }
1346
1347     // -------- User wants to change the number of links per page (linksperpage=...)
1348     if (isset($_GET['linksperpage']))
1349     {
1350         if (is_numeric($_GET['linksperpage'])) { $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage'])); }
1351         // Make sure the referrer is Shaarli itself.
1352         $referer = '?';
1353         if (!empty($_SERVER['HTTP_REFERER']) && strcmp(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST),$_SERVER['HTTP_HOST'])==0)
1354             $referer = $_SERVER['HTTP_REFERER'];
1355         header('Location: '.$referer);
1356         exit;
1357     }
1358
1359     // -------- User wants to see only private links (toggle)
1360     if (isset($_GET['privateonly']))
1361     {
1362         if (empty($_SESSION['privateonly']))
1363         {
1364             $_SESSION['privateonly']=1; // See only private links
1365         }
1366         else
1367         {
1368             unset($_SESSION['privateonly']); // See all links
1369         }
1370         // Make sure the referrer is Shaarli itself.
1371         $referer = '?';
1372         if (!empty($_SERVER['HTTP_REFERER']) && strcmp(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST),$_SERVER['HTTP_HOST'])==0)
1373             $referer = $_SERVER['HTTP_REFERER'];
1374         header('Location: '.$referer);
1375         exit;
1376     }
1377
1378     // -------- Handle other actions allowed for non-logged in users:
1379     if (!isLoggedIn())
1380     {
1381         // User tries to post new link but is not logged in:
1382         // Show login screen, then redirect to ?post=...
1383         if (isset($_GET['post']))
1384         {
1385             header('Location: ?do=login&post='.urlencode($_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.
1386             exit;
1387         }
1388
1389                 // Same case as above except that user tried to access ?do=addlink without being logged in
1390                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1391                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1392                         header('Location: ?do=login&post=');
1393                         exit;
1394                 }
1395
1396         $PAGE = new pageBuilder;
1397         buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1398         $PAGE->renderPage('linklist');
1399         exit; // Never remove this one! All operations below are reserved for logged in user.
1400     }
1401
1402     // -------- All other functions are reserved for the registered user:
1403
1404     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1405     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tools'))
1406     {
1407         $PAGE = new pageBuilder;
1408         $PAGE->assign('linkcount',count($LINKSDB));
1409         $PAGE->assign('pageabsaddr',indexUrl());
1410         $PAGE->renderPage('tools');
1411         exit;
1412     }
1413
1414     // -------- User wants to change his/her password.
1415     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changepasswd'))
1416     {
1417         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1418         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1419         {
1420             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1421
1422             // Make sure old password is correct.
1423             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1424             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1425             // Save new password
1426             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1427             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1428             writeConfig();
1429             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1430             exit;
1431         }
1432         else // show the change password form.
1433         {
1434             $PAGE = new pageBuilder;
1435             $PAGE->assign('linkcount',count($LINKSDB));
1436             $PAGE->assign('token',getToken());
1437             $PAGE->renderPage('changepassword');
1438             exit;
1439         }
1440     }
1441
1442     // -------- User wants to change configuration
1443     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=configure'))
1444     {
1445         if (!empty($_POST['title']) )
1446         {
1447             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1448             $tz = 'UTC';
1449             if (!empty($_POST['continent']) && !empty($_POST['city']))
1450                 if (isTZvalid($_POST['continent'],$_POST['city']))
1451                     $tz = $_POST['continent'].'/'.$_POST['city'];
1452             $GLOBALS['timezone'] = $tz;
1453             $GLOBALS['title']=$_POST['title'];
1454             $GLOBALS['titleLink']=$_POST['titleLink'];
1455             $GLOBALS['redirector']=$_POST['redirector'];
1456             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1457             $GLOBALS['disablejquery']=!empty($_POST['disablejquery']);
1458             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1459             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1460             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1461             writeConfig();
1462             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1463             exit;
1464         }
1465         else // Show the configuration form.
1466         {
1467             $PAGE = new pageBuilder;
1468             $PAGE->assign('linkcount',count($LINKSDB));
1469             $PAGE->assign('token',getToken());
1470             $PAGE->assign('title',htmlspecialchars( empty($GLOBALS['title']) ? '' : $GLOBALS['title'] , ENT_QUOTES));
1471             $PAGE->assign('redirector',htmlspecialchars( empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] , ENT_QUOTES));
1472             list($timezone_form,$timezone_js) = templateTZform($GLOBALS['timezone']);
1473             $PAGE->assign('timezone_form',$timezone_form); // FIXME: Put entire tz form generation in template?
1474             $PAGE->assign('timezone_js',$timezone_js);
1475             $PAGE->renderPage('configure');
1476             exit;
1477         }
1478     }
1479
1480     // -------- User wants to rename a tag or delete it
1481     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changetag'))
1482     {
1483         if (empty($_POST['fromtag']))
1484         {
1485             $PAGE = new pageBuilder;
1486             $PAGE->assign('linkcount',count($LINKSDB));
1487             $PAGE->assign('token',getToken());
1488             $PAGE->assign('tags', $LINKSDB->allTags());
1489             $PAGE->renderPage('changetag');
1490             exit;
1491         }
1492         if (!tokenOk($_POST['token'])) die('Wrong token.');
1493
1494         // Delete a tag:
1495         if (!empty($_POST['deletetag']) && !empty($_POST['fromtag']))
1496         {
1497             $needle=trim($_POST['fromtag']);
1498             $linksToAlter = $LINKSDB->filterTags($needle,true); // True for case-sensitive tag search.
1499             foreach($linksToAlter as $key=>$value)
1500             {
1501                 $tags = explode(' ',trim($value['tags']));
1502                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1503                 $value['tags']=trim(implode(' ',$tags));
1504                 $LINKSDB[$key]=$value;
1505             }
1506             $LINKSDB->savedb(); // Save to disk.
1507             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1508             exit;
1509         }
1510
1511         // Rename a tag:
1512         if (!empty($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag']))
1513         {
1514             $needle=trim($_POST['fromtag']);
1515             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
1516             foreach($linksToAlter as $key=>$value)
1517             {
1518                 $tags = explode(' ',trim($value['tags']));
1519                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1520                 $value['tags']=trim(implode(' ',$tags));
1521                 $LINKSDB[$key]=$value;
1522             }
1523             $LINKSDB->savedb(); // Save to disk.
1524             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1525             exit;
1526         }
1527     }
1528
1529     // -------- User wants to add a link without using the bookmarklet: Show form.
1530     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=addlink'))
1531     {
1532         $PAGE = new pageBuilder;
1533         $PAGE->assign('linkcount',count($LINKSDB));
1534         $PAGE->renderPage('addlink');
1535         exit;
1536     }
1537
1538     // -------- User clicked the "Save" button when editing a link: Save link to database.
1539     if (isset($_POST['save_edit']))
1540     {
1541         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1542         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1543         $linkdate=$_POST['lf_linkdate'];
1544         $url = trim($_POST['lf_url']);
1545         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?') && !startsWith($url,'javascript:'))
1546             $url = 'http://'.$url;
1547         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1548                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1549         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1550         $LINKSDB[$linkdate] = $link;
1551         $LINKSDB->savedb(); // Save to disk.
1552         pubsubhub();
1553
1554         // If we are called from the bookmarklet, we must close the popup:
1555         if (isset($_GET['source']) && $_GET['source']=='bookmarklet') { echo '<script>self.close();</script>'; exit; }
1556         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1557         $returnurl .= '#'.smallHash($linkdate);  // Scroll to the link which has been edited.
1558         if (strstr($returnurl, "do=addlink")) { $returnurl = '?'; } //if we come from ?do=addlink, set returnurl to homepage instead
1559         header('Location: '.$returnurl); // After saving the link, redirect to the page the user was on.
1560         exit;
1561     }
1562
1563     // -------- User clicked the "Cancel" button when editing a link.
1564     if (isset($_POST['cancel_edit']))
1565     {
1566         // If we are called from the bookmarklet, we must close the popup:
1567         if (isset($_GET['source']) && $_GET['source']=='bookmarklet') { echo '<script>self.close();</script>'; exit; }
1568         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1569         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1570         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1571         exit;
1572     }
1573
1574     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1575     if (isset($_POST['delete_link']))
1576     {
1577         if (!tokenOk($_POST['token'])) die('Wrong token.');
1578         // We do not need to ask for confirmation:
1579         // - confirmation is handled by JavaScript
1580         // - we are protected from XSRF by the token.
1581         $linkdate=$_POST['lf_linkdate'];
1582         unset($LINKSDB[$linkdate]);
1583         $LINKSDB->savedb(); // save to disk
1584
1585         // If we are called from the bookmarklet, we must close the popup:
1586         if (isset($_GET['source']) && $_GET['source']=='bookmarklet') { echo '<script>self.close();</script>'; exit; }
1587         // Pick where we're going to redirect
1588         // =============================================================
1589         // Basically, we can't redirect to where we were previously if it was a permalink
1590         // or an edit_link, because it would 404.
1591         // Cases:
1592         //    - /             : nothing in $_GET, redirect to self
1593         //    - /?page        : redirect to self
1594         //    - /?searchterm  : redirect to self (there might be other links)
1595         //    - /?searchtags  : redirect to self
1596         //    - /permalink    : redirect to / (the link does not exist anymore)
1597         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1598         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1599         // redirect is not satisfied, and only then redirect to /
1600         $location = "?";
1601         // Self redirection
1602         if (count($_GET) == 0    ||
1603             isset($_GET['page']) ||
1604             isset($_GET['searchterm']) ||
1605             isset($_GET['searchtags'])) {
1606
1607             if (isset($_POST['returnurl'])) {
1608                 $location = $_POST['returnurl']; // Handle redirects given by the form
1609             }
1610
1611             if ($location === "?" &&
1612                 isset($_SERVER['HTTP_REFERER'])) { // Handle HTTP_REFERER in case we're not coming from the same place.
1613                 $location = $_SERVER['HTTP_REFERER'];
1614             }
1615         }
1616
1617         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1618         exit;
1619     }
1620
1621     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1622     if (isset($_GET['edit_link']))
1623     {
1624         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1625         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1626         $PAGE = new pageBuilder;
1627         $PAGE->assign('linkcount',count($LINKSDB));
1628         $PAGE->assign('link',$link);
1629         $PAGE->assign('link_is_new',false);
1630         $PAGE->assign('token',getToken()); // XSRF protection.
1631         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : ''));
1632         $PAGE->assign('tags', $LINKSDB->allTags());
1633         $PAGE->renderPage('editlink');
1634         exit;
1635     }
1636
1637     // -------- User want to post a new link: Display link edit form.
1638     if (isset($_GET['post']))
1639     {
1640         $url=$_GET['post'];
1641
1642
1643         // We remove the annoying parameters added by FeedBurner, GoogleFeedProxy, Facebook...
1644         $annoyingpatterns = array('/[\?&]utm_source=[^&]*/', '/[\?&]utm_campaign=[^&]*/', '/[\?&]utm_medium=[^&]*/', '/#xtor=RSS-[^&]*/', '/[\?&]fb_[^&]*/', '/[\?&]__scoop[^&]*/', '/#tk\.rss_all\?/', '/[\?&]action_ref_map=[^&]*/', '/[\?&]action_type_map=[^&]*/', '/[\?&]action_object_map=[^&]*/');
1645         foreach($annoyingpatterns as $pattern)
1646         {
1647             $url = preg_replace($pattern, "", $url);
1648         }
1649
1650         $link_is_new = false;
1651         $link = $LINKSDB->getLinkFromUrl($url); // Check if URL is not already in database (in this case, we will edit the existing link)
1652         if (!$link)
1653         {
1654             $link_is_new = true;  // This is a new link
1655             $linkdate = strval(date('Ymd_His'));
1656             $title = (empty($_GET['title']) ? '' : $_GET['title'] ); // Get title if it was provided in URL (by the bookmarklet).
1657             $description = (empty($_GET['description']) ? '' : $_GET['description']); // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1658             $tags = (empty($_GET['tags']) ? '' : $_GET['tags'] ); // Get tags if it was provided in URL
1659             $private = (!empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0); // Get private if it was provided in URL
1660             if (($url!='') && parse_url($url,PHP_URL_SCHEME)=='') $url = 'http://'.$url;
1661             // 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.)
1662             if (empty($title) && parse_url($url,PHP_URL_SCHEME)=='http')
1663             {
1664                 list($status,$headers,$data) = getHTTP($url,4); // Short timeout to keep the application responsive.
1665                 // FIXME: Decode charset according to specified in either 1) HTTP response headers or 2) <head> in html
1666                 if (strpos($status,'200 OK')!==false)
1667                                          {
1668                         // Look for charset in html header.
1669                                                 preg_match('#<meta .*charset=.*>#Usi', $data, $meta);
1670
1671                                                 // If found, extract encoding.
1672                                                 if (!empty($meta[0]))
1673                                                 {
1674                                                         // Get encoding specified in header.
1675                                                         preg_match('#charset="?(.*)"#si', $meta[0], $enc);
1676                                                         // If charset not found, use utf-8.
1677                                                         $html_charset = (!empty($enc[1])) ? strtolower($enc[1]) : 'utf-8';
1678                                                 }
1679                                                 else { $html_charset = 'utf-8'; }
1680
1681                                                 // Extract title
1682                                                 $title = html_extract_title($data);
1683                                                 if (!empty($title))
1684                                                 {
1685                                                         // Re-encode title in utf-8 if necessary.
1686                                                         $title = ($html_charset == 'iso-8859-1') ? utf8_encode($title) : $title;
1687                                                 }
1688                                         }
1689             }
1690             if ($url=='') // In case of empty URL, this is just a text (with a link that points to itself)
1691             {
1692                 $url='?'.smallHash($linkdate);
1693                 $title='Note: ';
1694             }
1695             $link = array('linkdate'=>$linkdate,'title'=>$title,'url'=>$url,'description'=>$description,'tags'=>$tags,'private'=>$private);
1696         }
1697
1698         $PAGE = new pageBuilder;
1699         $PAGE->assign('linkcount',count($LINKSDB));
1700         $PAGE->assign('link',$link);
1701         $PAGE->assign('link_is_new',$link_is_new);
1702         $PAGE->assign('token',getToken()); // XSRF protection.
1703         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : ''));
1704         $PAGE->assign('tags', $LINKSDB->allTags());
1705         $PAGE->renderPage('editlink');
1706         exit;
1707     }
1708
1709     // -------- Export as Netscape Bookmarks HTML file.
1710     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=export'))
1711     {
1712         if (empty($_GET['what']))
1713         {
1714             $PAGE = new pageBuilder;
1715             $PAGE->assign('linkcount',count($LINKSDB));
1716             $PAGE->renderPage('export');
1717             exit;
1718         }
1719         $exportWhat=$_GET['what'];
1720         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1721
1722         header('Content-Type: text/html; charset=utf-8');
1723         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1724         $currentdate=date('Y/m/d H:i:s');
1725         echo <<<HTML
1726 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1727 <!-- This is an automatically generated file.
1728      It will be read and overwritten.
1729      DO NOT EDIT! -->
1730 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1731 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1732 <TITLE>Bookmarks</TITLE>
1733 <H1>Bookmarks</H1>
1734 HTML;
1735         foreach($LINKSDB as $link)
1736         {
1737             if ($exportWhat=='all' ||
1738                ($exportWhat=='private' && $link['private']!=0) ||
1739                ($exportWhat=='public' && $link['private']==0))
1740             {
1741                 echo '<DT><A HREF="'.htmlspecialchars($link['url']).'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1742                 if ($link['tags']!='') echo ' TAGS="'.htmlspecialchars(str_replace(' ',',',$link['tags'])).'"';
1743                 echo '>'.htmlspecialchars($link['title'])."</A>\n";
1744                 if ($link['description']!='') echo '<DD>'.htmlspecialchars($link['description'])."\n";
1745             }
1746         }
1747                 exit;
1748     }
1749
1750     // -------- User is uploading a file for import
1751     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1752     {
1753         // If file is too big, some form field may be missing.
1754         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1755         {
1756             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1757             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.htmlspecialchars($returnurl).'\';</script>';
1758             exit;
1759         }
1760         if (!tokenOk($_POST['token'])) die('Wrong token.');
1761         importFile();
1762         exit;
1763     }
1764
1765     // -------- Show upload/import dialog:
1766     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=import'))
1767     {
1768         $PAGE = new pageBuilder;
1769         $PAGE->assign('linkcount',count($LINKSDB));
1770         $PAGE->assign('token',getToken());
1771         $PAGE->assign('maxfilesize',getMaxFileSize());
1772         $PAGE->renderPage('import');
1773         exit;
1774     }
1775
1776     // -------- Otherwise, simply display search form and links:
1777     $PAGE = new pageBuilder;
1778     $PAGE->assign('linkcount',count($LINKSDB));
1779     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1780     $PAGE->renderPage('linklist');
1781     exit;
1782 }
1783
1784 // -----------------------------------------------------------------------------------------------
1785 // Process the import file form.
1786 function importFile()
1787 {
1788     if (!(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'])) { die('Not allowed.'); }
1789     $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if used it not logged in).
1790     $filename=$_FILES['filetoupload']['name'];
1791     $filesize=$_FILES['filetoupload']['size'];
1792     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1793     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1794     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1795     $import_count=0;
1796
1797     // Sniff file type:
1798     $type='unknown';
1799     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1800
1801     // Then import the bookmarks.
1802     if ($type=='netscape')
1803     {
1804         // This is a standard Netscape-style bookmark file.
1805         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1806         foreach(explode('<DT>',$data) as $html) // explode is very fast
1807         {
1808             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1809             $d = explode('<DD>',$html);
1810             if (startswith($d[0],'<A '))
1811             {
1812                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1813                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1814                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1815                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1816                 $raw_add_date=0;
1817                 foreach($matches as $m)
1818                 {
1819                     $attr=$m[1]; $value=$m[2];
1820                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1821                     elseif ($attr=='ADD_DATE')
1822                     {
1823                         $raw_add_date=intval($value);
1824                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1825                     }
1826                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1827                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1828                 }
1829                 if ($link['url']!='')
1830                 {
1831                     if ($private==1) $link['private']=1;
1832                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1833                     if ($dblink==false)
1834                     {  // Link not in database, let's import it...
1835                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1836
1837                        // Make sure date/time is not already used by another link.
1838                        // (Some bookmark files have several different links with the same ADD_DATE)
1839                        // We increment date by 1 second until we find a date which is not used in DB.
1840                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1841                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1842                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1843                        $LINKSDB[$link['linkdate']] = $link;
1844                        $import_count++;
1845                     }
1846                     else // Link already present in database.
1847                     {
1848                         if ($overwrite)
1849                         {   // If overwrite is required, we import link data, except date/time.
1850                             $link['linkdate']=$dblink['linkdate'];
1851                             $LINKSDB[$link['linkdate']] = $link;
1852                             $import_count++;
1853                         }
1854                     }
1855
1856                 }
1857             }
1858         }
1859         $LINKSDB->savedb();
1860
1861         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1862     }
1863     else
1864     {
1865         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1866     }
1867 }
1868
1869 // -----------------------------------------------------------------------------------------------
1870 // Template for the list of links (<div id="linklist">)
1871 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1872 function buildLinkList($PAGE,$LINKSDB)
1873 {
1874     // ---- Filter link database according to parameters
1875     $linksToDisplay=array();
1876     $search_type='';
1877     $search_crits='';
1878     if (isset($_GET['searchterm'])) // Fulltext search
1879     {
1880         $linksToDisplay = $LINKSDB->filterFulltext(trim($_GET['searchterm']));
1881         $search_crits=htmlspecialchars(trim($_GET['searchterm']));
1882         $search_type='fulltext';
1883     }
1884     elseif (isset($_GET['searchtags'])) // Search by tag
1885     {
1886         $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
1887         $search_crits=explode(' ',trim($_GET['searchtags']));
1888         $search_type='tags';
1889     }
1890     elseif (isset($_SERVER['QUERY_STRING']) && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/',$_SERVER['QUERY_STRING'])) // Detect smallHashes in URL
1891     {
1892         $linksToDisplay = $LINKSDB->filterSmallHash(substr(trim($_SERVER["QUERY_STRING"], '/'),0,6));
1893         if (count($linksToDisplay)==0)
1894         {
1895             header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
1896             echo '<h1>404 Not found.</h1>Oh crap. The link you are trying to reach does not exist or has been deleted.';
1897             echo '<br>You would mind <a href="?">clicking here</a>?';
1898             exit;
1899         }
1900         $search_type='permalink';
1901     }
1902     else
1903         $linksToDisplay = $LINKSDB;  // Otherwise, display without filtering.
1904
1905     // Option: Show only private links
1906     if (!empty($_SESSION['privateonly']))
1907     {
1908         $tmp = array();
1909         foreach($linksToDisplay as $linkdate=>$link)
1910         {
1911             if ($link['private']!=0) $tmp[$linkdate]=$link;
1912         }
1913         $linksToDisplay=$tmp;
1914     }
1915
1916     // ---- Handle paging.
1917     /* Can someone explain to me why you get the following error when using array_keys() on an object which implements the interface ArrayAccess???
1918        "Warning: array_keys() expects parameter 1 to be array, object given in ... "
1919        If my class implements ArrayAccess, why won't array_keys() accept it ?  ( $keys=array_keys($linksToDisplay); )
1920     */
1921     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; } // Stupid and ugly. Thanks PHP.
1922
1923     // If there is only a single link, we change on-the-fly the title of the page.
1924     if (count($linksToDisplay)==1) $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1925
1926     // Select articles according to paging.
1927     $pagecount = ceil(count($keys)/$_SESSION['LINKS_PER_PAGE']);
1928     $pagecount = ($pagecount==0 ? 1 : $pagecount);
1929     $page=( empty($_GET['page']) ? 1 : intval($_GET['page']));
1930     $page = ( $page<1 ? 1 : $page );
1931     $page = ( $page>$pagecount ? $pagecount : $page );
1932     $i = ($page-1)*$_SESSION['LINKS_PER_PAGE']; // Start index.
1933     $end = $i+$_SESSION['LINKS_PER_PAGE'];
1934     $linkDisp=array(); // Links to display
1935     while ($i<$end && $i<count($keys))
1936     {
1937         $link = $linksToDisplay[$keys[$i]];
1938         $link['description']=nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($link['description']))));
1939         $title=$link['title'];
1940         $classLi =  $i%2!=0 ? '' : 'publicLinkHightLight';
1941         $link['class'] = ($link['private']==0 ? $classLi : 'private');
1942         $link['timestamp']=linkdate2timestamp($link['linkdate']);
1943         $taglist = explode(' ',$link['tags']);
1944         uasort($taglist, 'strcasecmp');
1945         $link['taglist']=$taglist;
1946
1947         if ($link["url"][0] === '?' && // Check for both signs of a note: starting with ? and 7 chars long. I doubt that you'll post any links that look like this.
1948             strlen($link["url"]) === 7) {
1949             $link["url"] = indexUrl() . $link["url"];
1950         }
1951
1952         $linkDisp[$keys[$i]] = $link;
1953         $i++;
1954     }
1955
1956     // Compute paging navigation
1957     $searchterm= ( empty($_GET['searchterm']) ? '' : '&searchterm='.$_GET['searchterm'] );
1958     $searchtags= ( empty($_GET['searchtags']) ? '' : '&searchtags='.$_GET['searchtags'] );
1959     $paging='';
1960     $previous_page_url=''; if ($i!=count($keys)) $previous_page_url='?page='.($page+1).$searchterm.$searchtags;
1961     $next_page_url='';if ($page>1) $next_page_url='?page='.($page-1).$searchterm.$searchtags;
1962
1963     $token = ''; if (isLoggedIn()) $token=getToken();
1964
1965     // Fill all template fields.
1966     $PAGE->assign('linkcount',count($LINKSDB));
1967     $PAGE->assign('previous_page_url',$previous_page_url);
1968     $PAGE->assign('next_page_url',$next_page_url);
1969     $PAGE->assign('page_current',$page);
1970     $PAGE->assign('page_max',$pagecount);
1971     $PAGE->assign('result_count',count($linksToDisplay));
1972     $PAGE->assign('search_type',$search_type);
1973     $PAGE->assign('search_crits',$search_crits);
1974     $PAGE->assign('redirector',empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector']); // Optional redirector URL.
1975     $PAGE->assign('token',$token);
1976     $PAGE->assign('links',$linkDisp);
1977     return;
1978 }
1979
1980 // Compute the thumbnail for a link.
1981 //
1982 // With a link to the original URL.
1983 // Understands various services (youtube.com...)
1984 // Input: $url = URL for which the thumbnail must be found.
1985 //        $href = if provided, this URL will be followed instead of $url
1986 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1987 // Some of them may be missing.
1988 // Return an empty array if no thumbnail available.
1989 function computeThumbnail($url,$href=false)
1990 {
1991     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
1992     if ($href==false) $href=$url;
1993
1994     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1995     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1996     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1997     $domain = parse_url($url,PHP_URL_HOST);
1998     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1999     {
2000         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
2001         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
2002                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2003     }
2004     if ($domain=='youtu.be') // Youtube short links
2005     {
2006         $path = parse_url($url,PHP_URL_PATH);
2007         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
2008                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2009     }
2010     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
2011     {
2012         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
2013         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
2014                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
2015     }
2016
2017     if ($domain=='imgur.com')
2018     {
2019         $path = parse_url($url,PHP_URL_PATH);
2020         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
2021         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
2022                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2023         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
2024                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2025
2026         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
2027                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2028     }
2029     if ($domain=='i.imgur.com')
2030     {
2031         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
2032         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
2033                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2034     }
2035     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
2036     {
2037         if (strpos($url,'dailymotion.com/video/')!==false)
2038         {
2039             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
2040             return array('src'=>$thumburl,
2041                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
2042         }
2043     }
2044     if (endsWith($domain,'.imageshack.us'))
2045     {
2046         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2047         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2048         {
2049             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
2050             return array('src'=>$thumburl,
2051                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
2052         }
2053     }
2054
2055     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
2056     // So we deport the thumbnail generation in order not to slow down page generation
2057     // (and we also cache the thumbnail)
2058
2059     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
2060
2061     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
2062         || $domain=='vimeo.com'
2063         || $domain=='ted.com' || endsWith($domain,'.ted.com')
2064         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
2065     )
2066     {
2067         if ($domain=='vimeo.com')
2068         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
2069             $path = parse_url($url,PHP_URL_PATH);
2070             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
2071         }
2072         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2073         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
2074             $path = parse_url($url,PHP_URL_PATH);
2075             if (!preg_match('!/\d+.+?!',$path)) return array();
2076         }
2077         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2078         {   // Make sure this TED URL points to a video (/talks/...)
2079             $path = parse_url($url,PHP_URL_PATH);
2080             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
2081         }
2082         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2083         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.htmlspecialchars($sign).'&url='.urlencode($url),
2084                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2085     }
2086
2087     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
2088     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
2089     // But using the extension will do.
2090     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2091     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2092     {
2093         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2094         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.htmlspecialchars($sign).'&url='.urlencode($url),
2095                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2096     }
2097     return array(); // No thumbnail.
2098
2099 }
2100
2101
2102 // Returns the HTML code to display a thumbnail for a link
2103 // with a link to the original URL.
2104 // Understands various services (youtube.com...)
2105 // Input: $url = URL for which the thumbnail must be found.
2106 //        $href = if provided, this URL will be followed instead of $url
2107 // Returns '' if no thumbnail available.
2108 function thumbnail($url,$href=false)
2109 {
2110     $t = computeThumbnail($url,$href);
2111     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2112
2113     $html='<a href="'.htmlspecialchars($t['href']).'"><img src="'.htmlspecialchars($t['src']).'"';
2114     if (!empty($t['width']))  $html.=' width="'.htmlspecialchars($t['width']).'"';
2115     if (!empty($t['height'])) $html.=' height="'.htmlspecialchars($t['height']).'"';
2116     if (!empty($t['style']))  $html.=' style="'.htmlspecialchars($t['style']).'"';
2117     if (!empty($t['alt']))    $html.=' alt="'.htmlspecialchars($t['alt']).'"';
2118     $html.='></a>';
2119     return $html;
2120 }
2121
2122 // Returns the HTML code to display a thumbnail for a link
2123 // for the picture wall (using lazy image loading)
2124 // Understands various services (youtube.com...)
2125 // Input: $url = URL for which the thumbnail must be found.
2126 //        $href = if provided, this URL will be followed instead of $url
2127 // Returns '' if no thumbnail available.
2128 function lazyThumbnail($url,$href=false)
2129 {
2130     $t = computeThumbnail($url,$href);
2131     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2132
2133     $html='<a href="'.htmlspecialchars($t['href']).'">';
2134
2135     // Lazy image
2136     $html.='<img class="b-lazy" src="#" data-src="'.htmlspecialchars($t['src']).'"';
2137
2138     if (!empty($t['width']))  $html.=' width="'.htmlspecialchars($t['width']).'"';
2139     if (!empty($t['height'])) $html.=' height="'.htmlspecialchars($t['height']).'"';
2140     if (!empty($t['style']))  $html.=' style="'.htmlspecialchars($t['style']).'"';
2141     if (!empty($t['alt']))    $html.=' alt="'.htmlspecialchars($t['alt']).'"';
2142     $html.='>';
2143
2144     // No-JavaScript fallback.
2145     $html.='<noscript><img src="'.htmlspecialchars($t['src']).'"';
2146     if (!empty($t['width']))  $html.=' width="'.htmlspecialchars($t['width']).'"';
2147     if (!empty($t['height'])) $html.=' height="'.htmlspecialchars($t['height']).'"';
2148     if (!empty($t['style']))  $html.=' style="'.htmlspecialchars($t['style']).'"';
2149     if (!empty($t['alt']))    $html.=' alt="'.htmlspecialchars($t['alt']).'"';
2150     $html.='></noscript></a>';
2151
2152     return $html;
2153 }
2154
2155
2156 // -----------------------------------------------------------------------------------------------
2157 // Installation
2158 // This function should NEVER be called if the file data/config.php exists.
2159 function install()
2160 {
2161     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2162     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2163
2164
2165     // This part makes sure sessions works correctly.
2166     // (Because on some hosts, session.save_path may not be set correctly,
2167     // or we may not have write access to it.)
2168     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2169     {   // Step 2: Check if data in session is correct.
2170         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2171         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2172         echo 'It currently points to '.session_save_path().'<br>';
2173         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2174         echo '<br><a href="?">Click to try again.</a></pre>';
2175         die;
2176     }
2177     if (!isset($_SESSION['session_tested']))
2178     {   // Step 1 : Try to store data in session and reload page.
2179         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2180         header('Location: '.indexUrl().'?test_session');  // Redirect to check stored data.
2181     }
2182     if (isset($_GET['test_session']))
2183     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2184         header('Location: '.indexUrl());
2185     }
2186
2187
2188     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2189     {
2190         $tz = 'UTC';
2191         if (!empty($_POST['continent']) && !empty($_POST['city']))
2192             if (isTZvalid($_POST['continent'],$_POST['city']))
2193                 $tz = $_POST['continent'].'/'.$_POST['city'];
2194         $GLOBALS['timezone'] = $tz;
2195         // Everything is ok, let's create config file.
2196         $GLOBALS['login'] = $_POST['setlogin'];
2197         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2198         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2199         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.htmlspecialchars(indexUrl()) : $_POST['title'] );
2200         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2201         writeConfig();
2202         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2203         exit;
2204     }
2205
2206     // Display config form:
2207     list($timezone_form,$timezone_js) = templateTZform();
2208     $timezone_html=''; if ($timezone_form!='') $timezone_html='<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2209
2210     $PAGE = new pageBuilder;
2211     $PAGE->assign('timezone_html',$timezone_html);
2212     $PAGE->assign('timezone_js',$timezone_js);
2213     $PAGE->renderPage('install');
2214     exit;
2215 }
2216
2217 // Generates the timezone selection form and JavaScript.
2218 // Input: (optional) current timezone (can be 'UTC/UTC'). It will be pre-selected.
2219 // Output: array(html,js)
2220 // Example: list($htmlform,$js) = templateTZform('Europe/Paris');  // Europe/Paris pre-selected.
2221 // Returns array('','') if server does not support timezones list. (e.g. PHP 5.1 on free.fr)
2222 function templateTZform($ptz=false)
2223 {
2224     if (function_exists('timezone_identifiers_list')) // because of old PHP version (5.1) which can be found on free.fr
2225     {
2226         // Try to split the provided timezone.
2227         if ($ptz==false) { $l=timezone_identifiers_list(); $ptz=$l[0]; }
2228         $spos=strpos($ptz,'/'); $pcontinent=substr($ptz,0,$spos); $pcity=substr($ptz,$spos+1);
2229
2230         // Display config form:
2231         $timezone_form = '';
2232         $timezone_js = '';
2233         // The list is in the form "Europe/Paris", "America/Argentina/Buenos_Aires"...
2234         // We split the list in continents/cities.
2235         $continents = array();
2236         $cities = array();
2237         foreach(timezone_identifiers_list() as $tz)
2238         {
2239             if ($tz=='UTC') $tz='UTC/UTC';
2240             $spos = strpos($tz,'/');
2241             if ($spos!==false)
2242             {
2243                 $continent=substr($tz,0,$spos); $city=substr($tz,$spos+1);
2244                 $continents[$continent]=1;
2245                 if (!isset($cities[$continent])) $cities[$continent]='';
2246                 $cities[$continent].='<option value="'.$city.'"'.($pcity==$city?' selected':'').'>'.$city.'</option>';
2247             }
2248         }
2249         $continents_html = '';
2250         $continents = array_keys($continents);
2251         foreach($continents as $continent)
2252             $continents_html.='<option  value="'.$continent.'"'.($pcontinent==$continent?' selected':'').'>'.$continent.'</option>';
2253         $cities_html = $cities[$pcontinent];
2254         $timezone_form = "Continent: <select name=\"continent\" id=\"continent\" onChange=\"onChangecontinent();\">${continents_html}</select>";
2255         $timezone_form .= "&nbsp;&nbsp;&nbsp;&nbsp;City: <select name=\"city\" id=\"city\">${cities[$pcontinent]}</select><br />";
2256         $timezone_js = "<script>";
2257         $timezone_js .= "function onChangecontinent(){document.getElementById(\"city\").innerHTML = citiescontinent[document.getElementById(\"continent\").value];}";
2258         $timezone_js .= "var citiescontinent = ".json_encode($cities).";" ;
2259         $timezone_js .= "</script>" ;
2260         return array($timezone_form,$timezone_js);
2261     }
2262     return array('','');
2263 }
2264
2265 // Tells if a timezone is valid or not.
2266 // If not valid, returns false.
2267 // If system does not support timezone list, returns false.
2268 function isTZvalid($continent,$city)
2269 {
2270     $tz = $continent.'/'.$city;
2271     if (function_exists('timezone_identifiers_list')) // because of old PHP version (5.1) which can be found on free.fr
2272     {
2273         if (in_array($tz, timezone_identifiers_list())) // it's a valid timezone?
2274                     return true;
2275     }
2276     return false;
2277 }
2278 if (!function_exists('json_encode')) {
2279     function json_encode($data) {
2280         switch ($type = gettype($data)) {
2281             case 'NULL':
2282                 return 'null';
2283             case 'boolean':
2284                 return ($data ? 'true' : 'false');
2285             case 'integer':
2286             case 'double':
2287             case 'float':
2288                 return $data;
2289             case 'string':
2290                 return '"' . addslashes($data) . '"';
2291             case 'object':
2292                 $data = get_object_vars($data);
2293             case 'array':
2294                 $output_index_count = 0;
2295                 $output_indexed = array();
2296                 $output_associative = array();
2297                 foreach ($data as $key => $value) {
2298                     $output_indexed[] = json_encode($value);
2299                     $output_associative[] = json_encode($key) . ':' . json_encode($value);
2300                     if ($output_index_count !== NULL && $output_index_count++ !== $key) {
2301                         $output_index_count = NULL;
2302                     }
2303                 }
2304                 if ($output_index_count !== NULL) {
2305                     return '[' . implode(',', $output_indexed) . ']';
2306                 } else {
2307                     return '{' . implode(',', $output_associative) . '}';
2308                 }
2309             default:
2310                 return ''; // Not supported
2311         }
2312     }
2313 }
2314
2315 // Re-write configuration file according to globals.
2316 // Requires some $GLOBALS to be set (login,hash,salt,title).
2317 // If the config file cannot be saved, an error message is displayed and the user is redirected to "Tools" menu.
2318 // (otherwise, the function simply returns.)
2319 function writeConfig()
2320 {
2321     if (is_file($GLOBALS['config']['CONFIG_FILE']) && !isLoggedIn()) die('You are not authorized to alter config.'); // Only logged in user can alter config.
2322     $config='<?php $GLOBALS[\'login\']='.var_export($GLOBALS['login'],true).'; $GLOBALS[\'hash\']='.var_export($GLOBALS['hash'],true).'; $GLOBALS[\'salt\']='.var_export($GLOBALS['salt'],true).'; ';
2323     $config .='$GLOBALS[\'timezone\']='.var_export($GLOBALS['timezone'],true).'; date_default_timezone_set('.var_export($GLOBALS['timezone'],true).'); $GLOBALS[\'title\']='.var_export($GLOBALS['title'],true).';';
2324     $config .= '$GLOBALS[\'titleLink\']='.var_export($GLOBALS['titleLink'],true).'; ';
2325     $config .= '$GLOBALS[\'redirector\']='.var_export($GLOBALS['redirector'],true).'; ';
2326     $config .= '$GLOBALS[\'disablesessionprotection\']='.var_export($GLOBALS['disablesessionprotection'],true).'; ';
2327     $config .= '$GLOBALS[\'disablejquery\']='.var_export($GLOBALS['disablejquery'],true).'; ';
2328     $config .= '$GLOBALS[\'privateLinkByDefault\']='.var_export($GLOBALS['privateLinkByDefault'],true).'; ';
2329     $config .= '$GLOBALS[\'config\'][\'ENABLE_RSS_PERMALINKS\']='.var_export($GLOBALS['config']['ENABLE_RSS_PERMALINKS'], true).'; ';
2330     $config .= '$GLOBALS[\'config\'][\'ENABLE_UPDATECHECK\']='.var_export($GLOBALS['config']['ENABLE_UPDATECHECK'], true).'; ';
2331     $config .= ' ?>';
2332     if (!file_put_contents($GLOBALS['config']['CONFIG_FILE'],$config) || strcmp(file_get_contents($GLOBALS['config']['CONFIG_FILE']),$config)!=0)
2333     {
2334         echo '<script>alert("Shaarli could not create the config file. Please make sure Shaarli has the right to write in the folder is it installed in.");document.location=\'?\';</script>';
2335         exit;
2336     }
2337 }
2338
2339 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2340    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2341    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2342    This function is called by passing the URL:
2343    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2344    [URL] is the URL of the link (e.g. a flickr page)
2345    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2346    The function below will fetch the image from the webservice and store it in the cache.
2347 */
2348 function genThumbnail()
2349 {
2350     // Make sure the parameters in the URL were generated by us.
2351     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2352     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2353
2354     // Let's see if we don't already have the image for this URL in the cache.
2355     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2356     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2357     {   // We have the thumbnail, just serve it:
2358         header('Content-Type: image/jpeg');
2359         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2360         return;
2361     }
2362     // We may also serve a blank image (if service did not respond)
2363     $blankname=hash('sha1',$_GET['url']).'.gif';
2364     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2365     {
2366         header('Content-Type: image/gif');
2367         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2368         return;
2369     }
2370
2371     // Otherwise, generate the thumbnail.
2372     $url = $_GET['url'];
2373     $domain = parse_url($url,PHP_URL_HOST);
2374
2375     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2376     {
2377         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2378         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2379
2380         // Is this a link to an image, or to a flickr page ?
2381         $imageurl='';
2382         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2383         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2384             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2385             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2386         }
2387         else // This is a flickr page (html)
2388         {
2389             list($httpstatus,$headers,$data) = getHTTP($url,20); // Get the flickr html page.
2390             if (strpos($httpstatus,'200 OK')!==false)
2391             {
2392                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2393                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!',$data,$matches);
2394                 if (!empty($matches[1])) $imageurl=$matches[1];
2395
2396                 // In albums (and some other pages), the link rel="image_src" is not provided,
2397                 // but flickr provides:
2398                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2399                 if ($imageurl=='')
2400                 {
2401                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!',$data,$matches);
2402                     if (!empty($matches[1])) $imageurl=$matches[1];
2403                 }
2404             }
2405         }
2406
2407         if ($imageurl!='')
2408         {   // Let's download the image.
2409             list($httpstatus,$headers,$data) = getHTTP($imageurl,10); // Image is 240x120, so 10 seconds to download should be enough.
2410             if (strpos($httpstatus,'200 OK')!==false)
2411             {
2412                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2413                 header('Content-Type: image/jpeg');
2414                 echo $data;
2415                 return;
2416             }
2417         }
2418     }
2419
2420     elseif ($domain=='vimeo.com' )
2421     {
2422         // This is more complex: we have to perform a HTTP request, then parse the result.
2423         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2424         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2425         list($httpstatus,$headers,$data) = getHTTP('https://vimeo.com/api/v2/video/'.htmlspecialchars($vid).'.php',5);
2426         if (strpos($httpstatus,'200 OK')!==false)
2427         {
2428             $t = unserialize($data);
2429             $imageurl = $t[0]['thumbnail_medium'];
2430             // Then we download the image and serve it to our client.
2431             list($httpstatus,$headers,$data) = getHTTP($imageurl,10);
2432             if (strpos($httpstatus,'200 OK')!==false)
2433             {
2434                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2435                 header('Content-Type: image/jpeg');
2436                 echo $data;
2437                 return;
2438             }
2439         }
2440     }
2441
2442     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2443     {
2444         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2445         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2446         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2447         list($httpstatus,$headers,$data) = getHTTP($url,5);
2448         if (strpos($httpstatus,'200 OK')!==false)
2449         {
2450             // Extract the link to the thumbnail
2451             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!',$data,$matches);
2452             if (!empty($matches[1]))
2453             {   // Let's download the image.
2454                 $imageurl=$matches[1];
2455                 list($httpstatus,$headers,$data) = getHTTP($imageurl,20); // No control on image size, so wait long enough.
2456                 if (strpos($httpstatus,'200 OK')!==false)
2457                 {
2458                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2459                     file_put_contents($filepath,$data); // Save image to cache.
2460                     if (resizeImage($filepath))
2461                     {
2462                         header('Content-Type: image/jpeg');
2463                         echo file_get_contents($filepath);
2464                         return;
2465                     }
2466                 }
2467             }
2468         }
2469     }
2470
2471     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2472     {
2473         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2474         // http://xkcd.com/327/
2475         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2476         list($httpstatus,$headers,$data) = getHTTP($url,5);
2477         if (strpos($httpstatus,'200 OK')!==false)
2478         {
2479             // Extract the link to the thumbnail
2480             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!',$data,$matches);
2481             if (!empty($matches[1]))
2482             {   // Let's download the image.
2483                 $imageurl=$matches[1];
2484                 list($httpstatus,$headers,$data) = getHTTP($imageurl,20); // No control on image size, so wait long enough.
2485                 if (strpos($httpstatus,'200 OK')!==false)
2486                 {
2487                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2488                     file_put_contents($filepath,$data); // Save image to cache.
2489                     if (resizeImage($filepath))
2490                     {
2491                         header('Content-Type: image/jpeg');
2492                         echo file_get_contents($filepath);
2493                         return;
2494                     }
2495                 }
2496             }
2497         }
2498     }
2499
2500     else
2501     {
2502         // For all other domains, we try to download the image and make a thumbnail.
2503         list($httpstatus,$headers,$data) = getHTTP($url,30);  // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2504         if (strpos($httpstatus,'200 OK')!==false)
2505         {
2506             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2507             file_put_contents($filepath,$data); // Save image to cache.
2508             if (resizeImage($filepath))
2509             {
2510                 header('Content-Type: image/jpeg');
2511                 echo file_get_contents($filepath);
2512                 return;
2513             }
2514         }
2515     }
2516
2517
2518     // Otherwise, return an empty image (8x8 transparent gif)
2519     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2520     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2521     header('Content-Type: image/gif');
2522     echo $blankgif;
2523 }
2524
2525 // Make a thumbnail of the image (to width: 120 pixels)
2526 // Returns true if success, false otherwise.
2527 function resizeImage($filepath)
2528 {
2529     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2530
2531     // Trick: some stupid people rename GIF as JPEG... or else.
2532     // So we really try to open each image type whatever the extension is.
2533     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2534     $im=false;
2535     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2536     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2537     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2538     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2539     $w = imagesx($im);
2540     $h = imagesy($im);
2541     $ystart = 0; $yheight=$h;
2542     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2543     $nw = 120;   // Desired width
2544     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2545     // Resize image:
2546     $im2 = imagecreatetruecolor($nw,$nh);
2547     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2548     imageinterlace($im2,true); // For progressive JPEG.
2549     $tempname=$filepath.'_TEMP.jpg';
2550     imagejpeg($im2, $tempname, 90);
2551     imagedestroy($im);
2552     imagedestroy($im2);
2553     unlink($filepath);
2554     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2555     return true;
2556 }
2557
2558 // Invalidate caches when the database is changed or the user logs out.
2559 // (e.g. tags cache).
2560 function invalidateCaches()
2561 {
2562     unset($_SESSION['tags']);  // Purge cache attached to session.
2563     pageCache::purgeCache();   // Purge page cache shared by sessions.
2564 }
2565
2566 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2567 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2568 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2569 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2570 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=daily')) { showDaily(); exit; }
2571 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2572 renderPage();
2573 ?>