index.php

   1 <?php
   2 // Shaarli 0.0.42 beta - 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 /config/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']['ENABLE_THUMBNAILS'] = true; // Enable thumbnails in links.
  25 $GLOBALS['config']['CACHEDIR'] = 'cache'; // Cache directory for thumbnails for SLOW services (like flickr)
  26 $GLOBALS['config']['PAGECACHE'] = 'pagecache'; // Page cache directory.
  27 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true; // Enable Shaarli to store thumbnail in a local cache. Disable to reduce webspace usage.
  28 $GLOBALS['config']['PUBSUBHUB_URL'] = ''; // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
  29 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt'; // For updates check of Shaarli.
  30 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400 ; // Updates check frequency for Shaarli. 86400 seconds=24 hours
  31                                           // Note: You must have publisher.php in the same directory as Shaarli index.php
  32 // -----------------------------------------------------------------------------------------------
  33 // You should not touch below (or at your own risks !)
  34 // Optionnal config file.
  35 if (is_file($GLOBALS['config']['DATADIR'].'/options.php')) require($GLOBALS['config']['DATADIR'].'/options.php');
  36
  37 define('shaarli_version','0.0.42 beta');
  38 define('PHPPREFIX','<?php /* '); // Prefix to encapsulate data in php code.
  39 define('PHPSUFFIX',' */ ?>'); // Suffix to encapsulate data in php code.
  40 // http://server.com/x/shaarli --> /shaarli/
  41 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
  42
  43 // Force cookie path (but do not change lifetime)
  44 $cookie=session_get_cookie_params();
  45 $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
  46 session_set_cookie_params($cookie['lifetime'],$cookiedir,$_SERVER['HTTP_HOST']); // Set default cookie expiration and path.
  47
  48 // Set session parameters on server side.
  49 define('INACTIVITY_TIMEOUT',3600); // (in seconds). If the user does not access any page within this time, his/her session is considered expired.
  50 ini_set('session.use_cookies', 1);       // Use cookies to store session.
  51 ini_set('session.use_only_cookies', 1);  // Force cookies for session (phpsessionID forbidden in URL)
  52 ini_set('session.use_trans_sid', false); // Prevent php to use sessionID in URL if cookies are disabled.
  53 session_name('shaarli');
  54 if (session_id() == '') session_start();  // Start session if needed (Some server auto-start sessions).
  55
  56 // PHP Settings
  57 ini_set('max_input_time','60');  // High execution time in case of problematic imports/exports.
  58 ini_set('memory_limit', '128M');  // Try to set max upload file size and read (May not work on some hosts).
  59 ini_set('post_max_size', '16M');
  60 ini_set('upload_max_filesize', '16M');
  61 checkphpversion();
  62 error_reporting(E_ALL^E_WARNING);  // See all error except warnings.
  63 //error_reporting(-1); // See all errors (for debugging only)
  64
  65 include "inc/rain.tpl.class.php"; //include Rain TPL
  66 raintpl::$tpl_dir = "tpl/"; // template directory
  67 if (!is_dir('tmp')) { mkdir('tmp',0705); chmod('tmp',0705); }
  68 raintpl::$cache_dir = "tmp/"; // cache directory
  69
  70 ob_start();  // Output buffering for the page cache.
  71
  72
  73 // In case stupid admin has left magic_quotes enabled in php.ini:
  74 if (get_magic_quotes_gpc())
  75 {
  76     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
  77     $_POST = array_map('stripslashes_deep', $_POST);
  78     $_GET = array_map('stripslashes_deep', $_GET);
  79     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
  80 }
  81
  82 // Prevent caching on client side or proxy: (yes, it's ugly)
  83 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
  84 header("Cache-Control: no-store, no-cache, must-revalidate");
  85 header("Cache-Control: post-check=0, pre-check=0", false);
  86 header("Pragma: no-cache");
  87
  88 // Directories creations (Note that your web host may require differents rights than 705.)
  89 if (!is_writable(realpath(dirname(__FILE__)))) die('<pre>ERROR: Shaarli does not have the right to write in its own directory ('.realpath(dirname(__FILE__)).').</pre>');
  90 if (!is_dir($GLOBALS['config']['DATADIR'])) { mkdir($GLOBALS['config']['DATADIR'],0705); chmod($GLOBALS['config']['DATADIR'],0705); }
  91 if (!is_dir('tmp')) { mkdir('tmp',0705); chmod('tmp',0705); } // For RainTPL temporary files.
  92 if (!is_file($GLOBALS['config']['DATADIR'].'/.htaccess')) { file_put_contents($GLOBALS['config']['DATADIR'].'/.htaccess',"Allow from none\nDeny from all\n"); } // Protect data files.
  93 // Second check to see if Shaarli can write in its directory, because on some hosts is_writable() is not reliable.
  94 if (!is_file($GLOBALS['config']['DATADIR'].'/.htaccess')) die('<pre>ERROR: Shaarli does not have the right to write in its data directory ('.realpath($GLOBALS['config']['DATADIR']).').</pre>');
  95 if ($GLOBALS['config']['ENABLE_LOCALCACHE'])
  96 {
  97     if (!is_dir($GLOBALS['config']['CACHEDIR'])) { mkdir($GLOBALS['config']['CACHEDIR'],0705); chmod($GLOBALS['config']['CACHEDIR'],0705); }
  98     if (!is_file($GLOBALS['config']['CACHEDIR'].'/.htaccess')) { file_put_contents($GLOBALS['config']['CACHEDIR'].'/.htaccess',"Allow from none\nDeny from all\n"); } // Protect data files.
  99 }
 100
 101 // Handling of old config file which do not have the new parameters.
 102 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.htmlspecialchars(indexUrl());
 103 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 104 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 105 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 106 if (empty($GLOBALS['disablejquery'])) $GLOBALS['disablejquery']=false;
 107 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 108 // I really need to rewrite Shaarli with a proper configuation manager.
 109
 110 // Run config screen if first run:
 111 if (!is_file($GLOBALS['config']['CONFIG_FILE'])) install();
 112
 113 require $GLOBALS['config']['CONFIG_FILE'];  // Read login/password hash into $GLOBALS.
 114
 115 // a token depending of deployment salt, user password, and the current ip
 116 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 117
 118 autoLocale(); // Sniff browser language and set date format accordingly.
 119 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 120
 121 // Check php version
 122 function checkphpversion()
 123 {
 124     if (version_compare(PHP_VERSION, '5.1.0') < 0)
 125     {
 126         header('Content-Type: text/plain; charset=utf-8');
 127         echo 'Your server supports php '.PHP_VERSION.'. Shaarli requires at least php 5.1.0, and thus cannot run. Sorry.';
 128         exit;
 129     }
 130 }
 131
 132 // Checks if an update is available for Shaarli.
 133 // (at most once a day, and only for registered user.)
 134 // Output: '' = no new version.
 135 //         other= the available version.
 136 function checkUpdate()
 137 {
 138     if (!isLoggedIn()) return ''; // Do not check versions for visitors.
 139
 140     // Get latest version number at most once a day.
 141     if (!is_file($GLOBALS['config']['UPDATECHECK_FILENAME']) || (filemtime($GLOBALS['config']['UPDATECHECK_FILENAME'])<time()-($GLOBALS['config']['UPDATECHECK_INTERVAL'])))
 142     {
 143         $version=shaarli_version;
 144         list($httpstatus,$headers,$data) = getHTTP('http://sebsauvage.net/files/shaarli_version.txt',2);
 145         if (strpos($httpstatus,'200 OK')!==false) $version=$data;
 146         // If failed, nevermind. We don't want to bother the user with that.
 147         file_put_contents($GLOBALS['config']['UPDATECHECK_FILENAME'],$version); // touch file date
 148     }
 149     // Compare versions:
 150     $newestversion=file_get_contents($GLOBALS['config']['UPDATECHECK_FILENAME']);
 151     if (version_compare($newestversion,shaarli_version)==1) return $newestversion;
 152     return '';
 153 }
 154
 155
 156 // -----------------------------------------------------------------------------------------------
 157 // Simple cache system (mainly for the RSS/ATOM feeds).
 158
 159 class pageCache
 160 {
 161     private $url; // Full URL of the page to cache (typically the value returned by pageUrl())
 162     private $shouldBeCached; // boolean: Should this url be cached ?
 163     private $filename; // Name of the cache file for this url
 164
 165     /*
 166          $url = url (typically the value returned by pageUrl())
 167          $shouldBeCached = boolean. If false, the cache will be disabled.
 168     */
 169     public function __construct($url,$shouldBeCached)
 170     {
 171         $this->url = $url;
 172         $this->filename = $GLOBALS['config']['PAGECACHE'].'/'.sha1($url).'.cache';
 173         $this->shouldBeCached = $shouldBeCached;
 174     }
 175
 176     // If the page should be cached and a cached version exists,
 177     // returns the cached version (otherwise, return null).
 178     public function cachedVersion()
 179     {
 180         if (!$this->shouldBeCached) return null;
 181         if (is_file($this->filename)) { return file_get_contents($this->filename); exit; }
 182         return null;
 183     }
 184
 185     // Put a page in the cache.
 186     public function cache($page)
 187     {
 188         if (!$this->shouldBeCached) return;
 189         if (!is_dir($GLOBALS['config']['PAGECACHE'])) { mkdir($GLOBALS['config']['PAGECACHE'],0705); chmod($GLOBALS['config']['PAGECACHE'],0705); }
 190         file_put_contents($this->filename,$page);
 191     }
 192
 193     // Purge the whole cache.
 194     // (call with pageCache::purgeCache())
 195     public static function purgeCache()
 196     {
 197         if (is_dir($GLOBALS['config']['PAGECACHE']))
 198         {
 199             $handler = opendir($GLOBALS['config']['PAGECACHE']);
 200             if ($handler!==false)
 201             {
 202                 while (($filename = readdir($handler))!==false)
 203                 {
 204                     if (endsWith($filename,'.cache')) { unlink($GLOBALS['config']['PAGECACHE'].'/'.$filename); }
 205                 }
 206                 closedir($handler);
 207             }
 208         }
 209     }
 210
 211 }
 212
 213
 214 // -----------------------------------------------------------------------------------------------
 215 // Log to text file
 216 function logm($message)
 217 {
 218     $t = strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n";
 219     file_put_contents($GLOBALS['config']['DATADIR'].'/log.txt',$t,FILE_APPEND);
 220 }
 221
 222 // Same as nl2br(), but escapes < and >
 223 function nl2br_escaped($html)
 224 {
 225     return str_replace('>','&gt;',str_replace('<','&lt;',nl2br($html)));
 226 }
 227
 228 /* Returns the small hash of a string, using RFC 4648 base64url format
 229    eg. smallHash('20111006_131924') --> yZH23w
 230    Small hashes:
 231      - are unique (well, as unique as crc32, at last)
 232      - are always 6 characters long.
 233      - only use the following characters: a-z A-Z 0-9 - _ @
 234      - are NOT cryptographically secure (they CAN be forged)
 235    In Shaarli, they are used as a tinyurl-like link to individual entries.
 236 */
 237 function smallHash($text)
 238 {
 239     $t = rtrim(base64_encode(hash('crc32',$text,true)),'=');
 240     return strtr($t, '+/', '-_');
 241 }
 242
 243 // In a string, converts urls to clickable links.
 244 // Function inspired from http://www.php.net/manual/en/function.preg-replace.php#85722
 245 function text2clickable($url)
 246 {
 247     $redir = empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'];
 248     return preg_replace('!(((?:https?|ftp|file)://|apt:|magnet:)\S+[[:alnum:]]/?)!si','<a href="'.$redir.'$1" rel="nofollow">$1</a>',$url);
 249 }
 250
 251 // This function inserts &nbsp; where relevant so that multiple spaces are properly displayed in HTML
 252 // even in the absence of <pre>  (This is used in description to keep text formatting)
 253 function keepMultipleSpaces($text)
 254 {
 255     return str_replace('  ',' &nbsp;',$text);
 256
 257 }
 258 // ------------------------------------------------------------------------------------------
 259 // Sniff browser language to display dates in the right format automatically.
 260 // (Note that is may not work on your server if the corresponding local is not installed.)
 261 function autoLocale()
 262 {
 263     $loc='en_US'; // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 264     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // eg. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 265     {   // (It's a bit crude, but it works very well. Prefered language is always presented first.)
 266         if (preg_match('/([a-z]{2}(-[a-z]{2})?)/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) $loc=$matches[1];
 267     }
 268     setlocale(LC_TIME,$loc);  // LC_TIME = Set local for date/time format only.
 269 }
 270
 271 // ------------------------------------------------------------------------------------------
 272 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 273 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 274 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 275 function pubsubhub()
 276 {
 277     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 278     {
 279        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 280        $topic_url = array (
 281                        indexUrl().'?do=atom',
 282                        indexUrl().'?do=rss'
 283                     );
 284        $p->publish_update($topic_url);
 285     }
 286 }
 287
 288 // ------------------------------------------------------------------------------------------
 289 // Session management
 290
 291 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 292 function allIPs()
 293 {
 294     $ip = $_SERVER["REMOTE_ADDR"];
 295     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 296     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 297     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 298     return $ip;
 299 }
 300
 301 function fillSessionInfo() {
 302         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // generate unique random number (different than phpsessionid)
 303         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 304         $_SESSION['username']=$GLOBALS['login'];
 305         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 306 }
 307
 308 // Check that user/password is correct.
 309 function check_auth($login,$password)
 310 {
 311     $hash = sha1($password.$login.$GLOBALS['salt']);
 312     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 313     {   // Login/password is correct.
 314                 fillSessionInfo();
 315         logm('Login successful');
 316         return True;
 317     }
 318     logm('Login failed for user '.$login);
 319     return False;
 320 }
 321
 322 // Returns true if the user is logged in.
 323 function isLoggedIn()
 324 {
 325     if ($GLOBALS['config']['OPEN_SHAARLI']) return true;
 326
 327     if (!isset($GLOBALS['login'])) return false;  // Shaarli is not configured yet.
 328
 329         if (@$_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN)
 330         {
 331                 fillSessionInfo();
 332                 return true;
 333         }
 334     // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 335     if (empty($_SESSION['uid']) || ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) || time()>=$_SESSION['expires_on'])
 336     {
 337         logout();
 338         return false;
 339     }
 340     if (!empty($_SESSION['longlastingsession']))  $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 341     else $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 342
 343     return true;
 344 }
 345
 346 // Force logout.
 347 function logout() { if (isset($_SESSION)) { unset($_SESSION['uid']); unset($_SESSION['ip']); unset($_SESSION['username']); unset($_SESSION['privateonly']); }
 348 setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 349 }
 350
 351
 352 // ------------------------------------------------------------------------------------------
 353 // Brute force protection system
 354 // Several consecutive failed logins will ban the IP address for 30 minutes.
 355 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?>");
 356 include $GLOBALS['config']['IPBANS_FILENAME'];
 357 // Signal a failed login. Will ban the IP if too many failures:
 358 function ban_loginFailed()
 359 {
 360     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 361     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 362     $gb['FAILURES'][$ip]++;
 363     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 364     {
 365         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 366         logm('IP address banned from login');
 367     }
 368     $GLOBALS['IPBANS'] = $gb;
 369     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 370 }
 371
 372 // Signals a successful login. Resets failed login counter.
 373 function ban_loginOk()
 374 {
 375     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 376     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 377     $GLOBALS['IPBANS'] = $gb;
 378     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 379 }
 380
 381 // Checks if the user CAN login. If 'true', the user can try to login.
 382 function ban_canLogin()
 383 {
 384     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 385     if (isset($gb['BANS'][$ip]))
 386     {
 387         // User is banned. Check if the ban has expired:
 388         if ($gb['BANS'][$ip]<=time())
 389         {   // Ban expired, user can try to login again.
 390             logm('Ban lifted.');
 391             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 392             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 393             return true; // Ban has expired, user can login.
 394         }
 395         return false; // User is banned.
 396     }
 397     return true; // User is not banned.
 398 }
 399
 400 // ------------------------------------------------------------------------------------------
 401 // Process login form: Check if login/password is correct.
 402 if (isset($_POST['login']))
 403 {
 404     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 405     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 406     {   // Login/password is ok.
 407         ban_loginOk();
 408         // If user wants to keep the session cookie even after the browser closes:
 409         if (!empty($_POST['longlastingsession']))
 410         {
 411                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 412             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 413             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 414
 415             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 416             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['HTTP_HOST']); // Set session cookie expiration on client side
 417             // Note: Never forget the trailing slash on the cookie path !
 418             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 419         }
 420         else // Standard session expiration (=when browser closes)
 421         {
 422             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 423             session_set_cookie_params(0,$cookiedir,$_SERVER['HTTP_HOST']); // 0 means "When browser closes"
 424             session_regenerate_id(true);
 425         }
 426         // Optional redirect after login:
 427         if (isset($_GET['post'])) { header('Location: ?post='.urlencode($_GET['post']).(!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').(!empty($_GET['source'])?'&source='.urlencode($_GET['source']):'')); exit; }
 428         if (isset($_POST['returnurl']))
 429         {
 430             if (endsWith($_POST['returnurl'],'?do=login')) { header('Location: ?'); exit; } // Prevent loops over login screen.
 431             header('Location: '.$_POST['returnurl']); exit;
 432         }
 433         header('Location: ?'); exit;
 434     }
 435     else
 436     {
 437         ban_loginFailed();
 438         $redir = '';
 439         if (isset($_GET['post'])) { $redir = '&post='.urlencode($_GET['post']).(!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').(!empty($_GET['source'])?'&source='.urlencode($_GET['source']):'');  }
 440         echo '<script language="JavaScript">alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 441         exit;
 442     }
 443 }
 444
 445 // ------------------------------------------------------------------------------------------
 446 // Misc utility functions:
 447
 448 // Returns the server URL (including port and http/https), without path.
 449 // eg. "http://myserver.com:8080"
 450 // You can append $_SERVER['SCRIPT_NAME'] to get the current script URL.
 451 function serverUrl()
 452 {
 453     $https = (!empty($_SERVER['HTTPS']) && (strtolower($_SERVER['HTTPS'])=='on')) || $_SERVER["SERVER_PORT"]=='443'; // HTTPS detection.
 454     $serverport = ($_SERVER["SERVER_PORT"]=='80' || ($https && $_SERVER["SERVER_PORT"]=='443') ? '' : ':'.$_SERVER["SERVER_PORT"]);
 455     return 'http'.($https?'s':'').'://'.$_SERVER['HTTP_HOST'].$serverport;
 456 }
 457
 458 // Returns the absolute URL of current script, without the query.
 459 // (eg. http://sebsauvage.net/links/)
 460 function indexUrl()
 461 {
 462     $scriptname = $_SERVER["SCRIPT_NAME"];
 463     // If the script is named 'index.php', we remove it (for better looking URLs,
 464     // eg. http://mysite.com/shaarli/?abcde instead of http://mysite.com/shaarli/index.php?abcde)
 465     if (endswith($scriptname,'index.php')) $scriptname = substr($scriptname,0,strlen($scriptname)-9);
 466     return serverUrl() . $scriptname;
 467 }
 468
 469 // Returns the absolute URL of current script, WITH the query.
 470 // (eg. http://sebsauvage.net/links/?toto=titi&spamspamspam=humbug)
 471 function pageUrl()
 472 {
 473     return indexUrl().(!empty($_SERVER["QUERY_STRING"]) ? '?'.$_SERVER["QUERY_STRING"] : '');
 474 }
 475
 476 // Convert post_max_size/upload_max_filesize (eg.'16M') parameters to bytes.
 477 function return_bytes($val)
 478 {
 479     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 480     switch($last)
 481     {
 482         case 'g': $val *= 1024;
 483         case 'm': $val *= 1024;
 484         case 'k': $val *= 1024;
 485     }
 486     return $val;
 487 }
 488
 489 // Try to determine max file size for uploads (POST).
 490 // Returns an integer (in bytes)
 491 function getMaxFileSize()
 492 {
 493     $size1 = return_bytes(ini_get('post_max_size'));
 494     $size2 = return_bytes(ini_get('upload_max_filesize'));
 495     // Return the smaller of two:
 496     $maxsize = min($size1,$size2);
 497     // FIXME: Then convert back to readable notations ? (eg. 2M instead of 2000000)
 498     return $maxsize;
 499 }
 500
 501 // Tells if a string start with a substring or not.
 502 function startsWith($haystack,$needle,$case=true)
 503 {
 504     if($case){return (strcmp(substr($haystack, 0, strlen($needle)),$needle)===0);}
 505     return (strcasecmp(substr($haystack, 0, strlen($needle)),$needle)===0);
 506 }
 507
 508 // Tells if a string ends with a substring or not.
 509 function endsWith($haystack,$needle,$case=true)
 510 {
 511     if($case){return (strcmp(substr($haystack, strlen($haystack) - strlen($needle)),$needle)===0);}
 512     return (strcasecmp(substr($haystack, strlen($haystack) - strlen($needle)),$needle)===0);
 513 }
 514
 515 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 516     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 517     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 518 function linkdate2timestamp($linkdate)
 519 {
 520     $Y=$M=$D=$h=$m=$s=0;
 521     $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 522     return mktime($h,$m,$s,$M,$D,$Y);
 523 }
 524
 525 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 526     (used to build the pubDate attribute in RSS feed.)  */
 527 function linkdate2rfc822($linkdate)
 528 {
 529     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 530 }
 531
 532 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 533     (used to build the updated tags in ATOM feed.)  */
 534 function linkdate2iso8601($linkdate)
 535 {
 536     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 537 }
 538
 539 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a localized date format.
 540     (used to display link date on screen)
 541     The date format is automatically chosen according to locale/languages sniffed from browser headers (see autoLocale()). */
 542 function linkdate2locale($linkdate)
 543 {
 544     return utf8_encode(strftime('%c',linkdate2timestamp($linkdate))); // %c is for automatic date format according to locale.
 545     // Note that if you use a local which is not installed on your webserver,
 546     // the date will not be displayed in the chosen locale, but probably in US notation.
 547 }
 548
 549 // Parse HTTP response headers and return an associative array.
 550 function http_parse_headers_shaarli( $headers )
 551 {
 552     $res=array();
 553     foreach($headers as $header)
 554     {
 555         $i = strpos($header,': ');
 556         if ($i!==false)
 557         {
 558             $key=substr($header,0,$i);
 559             $value=substr($header,$i+2,strlen($header)-$i-2);
 560             $res[$key]=$value;
 561         }
 562     }
 563     return $res;
 564 }
 565
 566 /* GET an URL.
 567    Input: $url : url to get (http://...)
 568           $timeout : Network timeout (will wait this many seconds for an anwser before giving up).
 569    Output: An array.  [0] = HTTP status message (eg. "HTTP/1.1 200 OK") or error message
 570                       [1] = associative array containing HTTP response headers (eg. echo getHTTP($url)[1]['Content-Type'])
 571                       [2] = data
 572     Example: list($httpstatus,$headers,$data) = getHTTP('http://sebauvage.net/');
 573              if (strpos($httpstatus,'200 OK')!==false)
 574                  echo 'Data type: '.htmlspecialchars($headers['Content-Type']);
 575              else
 576                  echo 'There was an error: '.htmlspecialchars($httpstatus)
 577 */
 578 function getHTTP($url,$timeout=30)
 579 {
 580     try
 581     {
 582         $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
 583         $context = stream_context_create($options);
 584         $data=file_get_contents($url,false,$context,-1, 4000000); // We download at most 4 Mb from source.
 585         if (!$data) { return array('HTTP Error',array(),''); }
 586         $httpStatus=$http_response_header[0]; // eg. "HTTP/1.1 200 OK"
 587         $responseHeaders=http_parse_headers_shaarli($http_response_header);
 588         return array($httpStatus,$responseHeaders,$data);
 589     }
 590     catch (Exception $e)  // getHTTP *can* fail silentely (we don't care if the title cannot be fetched)
 591     {
 592         return array($e->getMessage(),'','');
 593     }
 594 }
 595
 596 // Extract title from an HTML document.
 597 // (Returns an empty string if not found.)
 598 function html_extract_title($html)
 599 {
 600   return preg_match('!<title>(.*?)</title>!is', $html, $matches) ? trim(str_replace("\n",' ', $matches[1])) : '' ;
 601 }
 602
 603 // ------------------------------------------------------------------------------------------
 604 // Token management for XSRF protection
 605 // Token should be used in any form which acts on data (create,update,delete,import...).
 606 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 607
 608 // Returns a token.
 609 function getToken()
 610 {
 611     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 612     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 613     return $rnd;
 614 }
 615
 616 // Tells if a token is ok. Using this function will destroy the token.
 617 // true=token is ok.
 618 function tokenOk($token)
 619 {
 620     if (isset($_SESSION['tokens'][$token]))
 621     {
 622         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 623         return true; // Token is ok.
 624     }
 625     return false; // Wrong token, or already used.
 626 }
 627
 628 // ------------------------------------------------------------------------------------------
 629 /* This class is in charge of building the final page.
 630    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 631    p = new pageBuilder;
 632    p.assign('myfield','myvalue');
 633    p.renderPage('mytemplate');
 634
 635 */
 636 class pageBuilder
 637 {
 638     private $tpl; // RainTPL template
 639
 640     function __construct()
 641     {
 642         $this->tpl=false;
 643     }
 644
 645     private function initialize()
 646     {
 647         $this->tpl = new RainTPL;
 648         $this->tpl->assign('newversion',checkUpdate());
 649         $this->tpl->assign('feedurl',htmlspecialchars(indexUrl()));
 650         $searchcrits=''; // Search criteria
 651         if (!empty($_GET['searchtags'])) $searchcrits.='&searchtags='.urlencode($_GET['searchtags']);
 652         elseif (!empty($_GET['searchterm'])) $searchcrits.='&searchterm='.urlencode($_GET['searchterm']);
 653         $this->tpl->assign('searchcrits',$searchcrits);
 654         $this->tpl->assign('source',indexUrl());
 655         $this->tpl->assign('version',shaarli_version);
 656         $this->tpl->assign('scripturl',indexUrl());
 657         $this->tpl->assign('pagetitle','Shaarli');
 658         $this->tpl->assign('privateonly',!empty($_SESSION['privateonly'])); // Show only private links ?
 659         if (!empty($GLOBALS['title'])) $this->tpl->assign('pagetitle',$GLOBALS['title']);
 660         if (!empty($GLOBALS['pagetitle'])) $this->tpl->assign('pagetitle',$GLOBALS['pagetitle']);
 661         $this->tpl->assign('shaarlititle',empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title'] );
 662         return;
 663     }
 664
 665     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 666     public function assign($what,$where)
 667     {
 668         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 669         $this->tpl->assign($what,$where);
 670     }
 671
 672     // Render a specific page (using a template).
 673     // eg. pb.renderPage('picwall')
 674     public function renderPage($page)
 675     {
 676         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 677         $this->tpl->draw($page);
 678     }
 679 }
 680
 681 // ------------------------------------------------------------------------------------------
 682 /* Data storage for links.
 683    This object behaves like an associative array.
 684    Example:
 685       $mylinks = new linkdb();
 686       echo $mylinks['20110826_161819']['title'];
 687       foreach($mylinks as $link)
 688          echo $link['title'].' at url '.$link['url'].' ; description:'.$link['description'];
 689
 690    Available keys:
 691        title : Title of the link
 692        url : URL of the link. Can be absolute or relative. Relative URLs are permalinks (eg.'?m-ukcw')
 693        description : description of the entry
 694        private : Is this link private ? 0=no, other value=yes
 695        linkdate : date of the creation of this entry, in the form YYYYMMDD_HHMMSS (eg.'20110914_192317')
 696        tags : tags attached to this entry (separated by spaces)
 697
 698    We implement 3 interfaces:
 699      - ArrayAccess so that this object behaves like an associative array.
 700      - Iterator so that this object can be used in foreach() loops.
 701      - Countable interface so that we can do a count() on this object.
 702 */
 703 class linkdb implements Iterator, Countable, ArrayAccess
 704 {
 705     private $links; // List of links (associative array. Key=linkdate (eg. "20110823_124546"), value= associative array (keys:title,description...)
 706     private $urls;  // List of all recorded URLs (key=url, value=linkdate) for fast reserve search (url-->linkdate)
 707     private $keys;  // List of linkdate keys (for the Iterator interface implementation)
 708     private $position; // Position in the $this->keys array. (for the Iterator interface implementation.)
 709     private $loggedin; // Is the used logged in ? (used to filter private links)
 710
 711     // Constructor:
 712     function __construct($isLoggedIn)
 713     // Input : $isLoggedIn : is the used logged in ?
 714     {
 715         $this->loggedin = $isLoggedIn;
 716         $this->checkdb(); // Make sure data file exists.
 717         $this->readdb();  // Then read it.
 718     }
 719
 720     // ---- Countable interface implementation
 721     public function count() { return count($this->links); }
 722
 723     // ---- ArrayAccess interface implementation
 724     public function offsetSet($offset, $value)
 725     {
 726         if (!$this->loggedin) die('You are not authorized to add a link.');
 727         if (empty($value['linkdate']) || empty($value['url'])) die('Internal Error: A link should always have a linkdate and url.');
 728         if (empty($offset)) die('You must specify a key.');
 729         $this->links[$offset] = $value;
 730         $this->urls[$value['url']]=$offset;
 731     }
 732     public function offsetExists($offset) { return array_key_exists($offset,$this->links); }
 733     public function offsetUnset($offset)
 734     {
 735         if (!$this->loggedin) die('You are not authorized to delete a link.');
 736         $url = $this->links[$offset]['url']; unset($this->urls[$url]);
 737         unset($this->links[$offset]);
 738     }
 739     public function offsetGet($offset) { return isset($this->links[$offset]) ? $this->links[$offset] : null; }
 740
 741     // ---- Iterator interface implementation
 742     function rewind() { $this->keys=array_keys($this->links); rsort($this->keys); $this->position=0; } // Start over for iteration, ordered by date (latest first).
 743     function key() { return $this->keys[$this->position]; } // current key
 744     function current() { return $this->links[$this->keys[$this->position]]; } // current value
 745     function next() { ++$this->position; } // go to next item
 746     function valid() { return isset($this->keys[$this->position]); }    // Check if current position is valid.
 747
 748     // ---- Misc methods
 749     private function checkdb() // Check if db directory and file exists.
 750     {
 751         if (!file_exists($GLOBALS['config']['DATASTORE'])) // Create a dummy database for example.
 752         {
 753              $this->links = array();
 754              $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');
 755              $this->links[$link['linkdate']] = $link;
 756              $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');
 757              $this->links[$link['linkdate']] = $link;
 758              file_put_contents($GLOBALS['config']['DATASTORE'], PHPPREFIX.base64_encode(gzdeflate(serialize($this->links))).PHPSUFFIX); // Write database to disk
 759         }
 760     }
 761
 762     // Read database from disk to memory
 763     private function readdb()
 764     {
 765         // Read data
 766         $this->links=(file_exists($GLOBALS['config']['DATASTORE']) ? unserialize(gzinflate(base64_decode(substr(file_get_contents($GLOBALS['config']['DATASTORE']),strlen(PHPPREFIX),-strlen(PHPSUFFIX))))) : array() );
 767         // Note that gzinflate is faster than gzuncompress. See: http://www.php.net/manual/en/function.gzdeflate.php#96439
 768
 769         // If user is not logged in, filter private links.
 770         if (!$this->loggedin)
 771         {
 772             $toremove=array();
 773             foreach($this->links as $link) { if ($link['private']!=0) $toremove[]=$link['linkdate']; }
 774             foreach($toremove as $linkdate) { unset($this->links[$linkdate]); }
 775         }
 776
 777         // Keep the list of the mapping URLs-->linkdate up-to-date.
 778         $this->urls=array();
 779         foreach($this->links as $link) { $this->urls[$link['url']]=$link['linkdate']; }
 780     }
 781
 782     // Save database from memory to disk.
 783     public function savedb()
 784     {
 785         if (!$this->loggedin) die('You are not authorized to change the database.');
 786         file_put_contents($GLOBALS['config']['DATASTORE'], PHPPREFIX.base64_encode(gzdeflate(serialize($this->links))).PHPSUFFIX);
 787         invalidateCaches();
 788     }
 789
 790     // Returns the link for a given URL (if it exists). false it does not exist.
 791     public function getLinkFromUrl($url)
 792     {
 793         if (isset($this->urls[$url])) return $this->links[$this->urls[$url]];
 794         return false;
 795     }
 796
 797     // Case insentitive search among links (in url, title and description). Returns filtered list of links.
 798     // eg. print_r($mydb->filterFulltext('hollandais'));
 799     public function filterFulltext($searchterms)
 800     {
 801         // FIXME: explode(' ',$searchterms) and perform a AND search.
 802         // FIXME: accept double-quotes to search for a string "as is" ?
 803         $filtered=array();
 804         $s = strtolower($searchterms);
 805         foreach($this->links as $l)
 806         {
 807             $found=   (strpos(strtolower($l['title']),$s)!==false)
 808                    || (strpos(strtolower($l['description']),$s)!==false)
 809                    || (strpos(strtolower($l['url']),$s)!==false)
 810                    || (strpos(strtolower($l['tags']),$s)!==false);
 811             if ($found) $filtered[$l['linkdate']] = $l;
 812         }
 813         krsort($filtered);
 814         return $filtered;
 815     }
 816
 817     // Filter by tag.
 818     // You can specify one or more tags (tags can be separated by space or comma).
 819     // eg. print_r($mydb->filterTags('linux programming'));
 820     public function filterTags($tags,$casesensitive=false)
 821     {
 822         $t = str_replace(',',' ',($casesensitive?$tags:strtolower($tags)));
 823         $searchtags=explode(' ',$t);
 824         $filtered=array();
 825         foreach($this->links as $l)
 826         {
 827             $linktags = explode(' ',($casesensitive?$l['tags']:strtolower($l['tags'])));
 828             if (count(array_intersect($linktags,$searchtags)) == count($searchtags))
 829                 $filtered[$l['linkdate']] = $l;
 830         }
 831         krsort($filtered);
 832         return $filtered;
 833     }
 834
 835     // Filter by day. Day must be in the form 'YYYYMMDD' (eg. '20120125')
 836     // Sort order is: older articles first.
 837     // eg. print_r($mydb->filterDay('20120125'));
 838     public function filterDay($day)
 839     {
 840         $filtered=array();
 841         foreach($this->links as $l)
 842         {
 843             if (startsWith($l['linkdate'],$day)) $filtered[$l['linkdate']] = $l;
 844         }
 845         ksort($filtered);
 846         return $filtered;
 847     }
 848     // Filter by smallHash.
 849     // Only 1 article is returned.
 850     public function filterSmallHash($smallHash)
 851     {
 852         $filtered=array();
 853         foreach($this->links as $l)
 854         {
 855             if ($smallHash==smallHash($l['linkdate'])) // Yes, this is ugly and slow
 856             {
 857                 $filtered[$l['linkdate']] = $l;
 858                 return $filtered;
 859             }
 860         }
 861         return $filtered;
 862     }
 863
 864     // Returns the list of all tags
 865     // Output: associative array key=tags, value=0
 866     public function allTags()
 867     {
 868         $tags=array();
 869         foreach($this->links as $link)
 870             foreach(explode(' ',$link['tags']) as $tag)
 871                 if (!empty($tag)) $tags[$tag]=(empty($tags[$tag]) ? 1 : $tags[$tag]+1);
 872         arsort($tags); // Sort tags by usage (most used tag first)
 873         return $tags;
 874     }
 875
 876     // Returns the list of days containing articles (oldest first)
 877     // Output: An array containing days (in format YYYYMMDD).
 878     public function days()
 879     {
 880         $linkdays=array();
 881         foreach(array_keys($this->links) as $day)
 882         {
 883             $linkdays[substr($day,0,8)]=0;
 884         }
 885         $linkdays=array_keys($linkdays);
 886         sort($linkdays);
 887         return $linkdays;
 888     }
 889 }
 890
 891 // ------------------------------------------------------------------------------------------
 892 // Ouput the last N links in RSS 2.0 format.
 893 function showRSS()
 894 {
 895     header('Content-Type: application/rss+xml; charset=utf-8');
 896
 897     // $usepermalink : If true, use permalink instead of final link.
 898     // User just has to add 'permalink' in URL parameters. eg. http://mysite.com/shaarli/?do=rss&permalinks
 899     $usepermalinks = isset($_GET['permalinks']);
 900
 901     // Cache system
 902     $query = $_SERVER["QUERY_STRING"];
 903     $cache = new pageCache(pageUrl(),startsWith($query,'do=rss') && !isLoggedIn());
 904     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
 905
 906     // If cached was not found (or not usable), then read the database and build the response:
 907     $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if used it not logged in).
 908
 909     // Optionnaly filter the results:
 910     $linksToDisplay=array();
 911     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 912     elseif (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 913     else $linksToDisplay = $LINKSDB;
 914     $nblinksToDisplay = 50;  // Number of links to display.
 915     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 916     {
 917         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 918     }
 919
 920     $pageaddr=htmlspecialchars(indexUrl());
 921     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 922     echo '<channel><title>'.htmlspecialchars($GLOBALS['title']).'</title><link>'.$pageaddr.'</link>';
 923     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 924     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 925     {
 926         echo '<!-- PubSubHubbub Discovery -->';
 927         echo '<link rel="hub" href="'.htmlspecialchars($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 928         echo '<link rel="self" href="'.htmlspecialchars($pageaddr).'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 929         echo '<!-- End Of PubSubHubbub Discovery -->';
 930     }
 931     $i=0;
 932     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 933     while ($i<$nblinksToDisplay && $i<count($keys))
 934     {
 935         $link = $linksToDisplay[$keys[$i]];
 936         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 937         $rfc822date = linkdate2rfc822($link['linkdate']);
 938         $absurl = htmlspecialchars($link['url']);
 939         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 940         if ($usepermalinks===true)
 941             echo '<item><title>'.htmlspecialchars($link['title']).'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$guid.'</link>';
 942         else
 943             echo '<item><title>'.htmlspecialchars($link['title']).'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 944         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.htmlspecialchars($rfc822date)."</pubDate>\n";
 945         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 946         {
 947             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.htmlspecialchars($pageaddr).'">'.htmlspecialchars($tag).'</category>'."\n"; }
 948         }
 949
 950         // Add permalink in description
 951         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 952         // If user wants permalinks first, put the final link in description
 953         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 954         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 955         echo '<description><![CDATA['.nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($link['description'])))).$descriptionlink.']]></description>'."\n</item>\n";
 956         $i++;
 957     }
 958     echo '</channel></rss><!-- Cached version of '.htmlspecialchars(pageUrl()).' -->';
 959
 960     $cache->cache(ob_get_contents());
 961     ob_end_flush();
 962     exit;
 963 }
 964
 965 // ------------------------------------------------------------------------------------------
 966 // Ouput the last N links in ATOM format.
 967 function showATOM()
 968 {
 969     header('Content-Type: application/atom+xml; charset=utf-8');
 970
 971     // $usepermalink : If true, use permalink instead of final link.
 972     // User just has to add 'permalink' in URL parameters. eg. http://mysite.com/shaarli/?do=atom&permalinks
 973     $usepermalinks = isset($_GET['permalinks']);
 974
 975     // Cache system
 976     $query = $_SERVER["QUERY_STRING"];
 977     $cache = new pageCache(pageUrl(),startsWith($query,'do=atom') && !isLoggedIn());
 978     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
 979     // If cached was not found (or not usable), then read the database and build the response:
 980
 981     $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if used it not logged in).
 982
 983
 984     // Optionnaly filter the results:
 985     $linksToDisplay=array();
 986     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 987     elseif (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 988     else $linksToDisplay = $LINKSDB;
 989     $nblinksToDisplay = 50;  // Number of links to display.
 990     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 991     {
 992         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 993     }
 994
 995     $pageaddr=htmlspecialchars(indexUrl());
 996     $latestDate = '';
 997     $entries='';
 998     $i=0;
 999     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
1000     while ($i<$nblinksToDisplay && $i<count($keys))
1001     {
1002         $link = $linksToDisplay[$keys[$i]];
1003         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
1004         $iso8601date = linkdate2iso8601($link['linkdate']);
1005         $latestDate = max($latestDate,$iso8601date);
1006         $absurl = htmlspecialchars($link['url']);
1007         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
1008         $entries.='<entry><title>'.htmlspecialchars($link['title']).'</title>';
1009         if ($usepermalinks===true)
1010             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
1011         else
1012             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
1013         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.htmlspecialchars($iso8601date).'</updated>';
1014
1015         // Add permalink in description
1016         $descriptionlink = htmlspecialchars('(<a href="'.$guid.'">Permalink</a>)');
1017         // If user wants permalinks first, put the final link in description
1018         if ($usepermalinks===true) $descriptionlink = htmlspecialchars('(<a href="'.$absurl.'">Link</a>)');
1019         if (strlen($link['description'])>0) $descriptionlink = '&lt;br&gt;'.$descriptionlink;
1020
1021         $entries.='<content type="html">'.htmlspecialchars(nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($link['description']))))).$descriptionlink."</content>\n";
1022         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
1023         {
1024             foreach(explode(' ',$link['tags']) as $tag)
1025                 { $entries.='<category scheme="'.htmlspecialchars($pageaddr,ENT_QUOTES).'" term="'.htmlspecialchars($tag,ENT_QUOTES).'" />'."\n"; }
1026         }
1027         $entries.="</entry>\n";
1028         $i++;
1029     }
1030     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
1031     $feed.='<title>'.htmlspecialchars($GLOBALS['title']).'</title>';
1032     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.htmlspecialchars($latestDate).'</updated>';
1033     $feed.='<link rel="self" href="'.htmlspecialchars(serverUrl().$_SERVER["REQUEST_URI"]).'" />';
1034     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
1035     {
1036         $feed.='<!-- PubSubHubbub Discovery -->';
1037         $feed.='<link rel="hub" href="'.htmlspecialchars($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
1038         $feed.='<!-- End Of PubSubHubbub Discovery -->';
1039     }
1040     $feed.='<author><name>'.htmlspecialchars($pageaddr).'</name><uri>'.htmlspecialchars($pageaddr).'</uri></author>';
1041     $feed.='<id>'.htmlspecialchars($pageaddr).'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
1042     $feed.=$entries;
1043     $feed.='</feed><!-- Cached version of '.htmlspecialchars(pageUrl()).' -->';
1044     echo $feed;
1045
1046     $cache->cache(ob_get_contents());
1047     ob_end_flush();
1048     exit;
1049 }
1050
1051 // ------------------------------------------------------------------------------------------
1052 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
1053 // Gives the last 7 days (which have links).
1054 // This RSS feed cannot be filtered.
1055 function showDailyRSS()
1056 {
1057     // Cache system
1058     $query = $_SERVER["QUERY_STRING"];
1059     $cache = new pageCache(pageUrl(),startsWith($query,'do=dailyrss') && !isLoggedIn());
1060     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
1061     // If cached was not found (or not usable), then read the database and build the response:
1062     $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if used it not logged in).
1063
1064     /* Some Shaarlies may have very few links, so we need to look
1065        back in time (rsort()) until we have enough days ($nb_of_days).
1066     */
1067     $linkdates=array(); foreach($LINKSDB as $linkdate=>$value) { $linkdates[]=$linkdate; }
1068     rsort($linkdates);
1069     $nb_of_days=7; // We take 7 days.
1070     $today=Date('Ymd');
1071     $days=array();
1072     foreach($linkdates as $linkdate)
1073     {
1074         $day=substr($linkdate,0,8); // Extract day (without time)
1075         if (strcmp($day,$today)<0)
1076         {
1077             if (empty($days[$day])) $days[$day]=array();
1078             $days[$day][]=$linkdate;
1079         }
1080         if (count($days)>$nb_of_days) break; // Have we collected enough days ?
1081     }
1082
1083     // Build the RSS feed.
1084     header('Content-Type: application/rss+xml; charset=utf-8');
1085     $pageaddr=htmlspecialchars(indexUrl());
1086     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
1087     echo '<channel><title>Daily - '.htmlspecialchars($GLOBALS['title']).'</title><link>'.$pageaddr.'</link>';
1088     echo '<description>Daily shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n";
1089
1090     foreach($days as $day=>$linkdates) // For each day.
1091     {
1092         $daydate = utf8_encode(strftime('%A %d, %B %Y',linkdate2timestamp($day.'_000000'))); // Full text date
1093         $rfc822date = linkdate2rfc822($day.'_000000');
1094         $absurl=htmlspecialchars(indexUrl().'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
1095         echo '<item><title>'.htmlspecialchars($GLOBALS['title'].' - '.$daydate).'</title><guid>'.$absurl.'</guid><link>'.$absurl.'</link>';
1096         echo '<pubDate>'.htmlspecialchars($rfc822date)."</pubDate>";
1097
1098         // Build the HTML body of this RSS entry.
1099         $html='';
1100         $href='';
1101         $links=array();
1102         // We pre-format some fields for proper output.
1103         foreach($linkdates as $linkdate)
1104         {
1105             $l = $LINKSDB[$linkdate];
1106             $l['formatedDescription']=nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($l['description']))));
1107             $l['thumbnail'] = thumbnail($l['url']);
1108             $l['localdate']=linkdate2locale($l['linkdate']);
1109             if (startsWith($l['url'],'?')) $l['url']=indexUrl().$l['url'];  // make permalink URL absolute
1110             $links[$linkdate]=$l;
1111         }
1112         // Then build the HTML for this day:
1113         $tpl = new RainTPL;
1114         $tpl->assign('links',$links);
1115         $html = $tpl->draw('dailyrss',$return_string=true);
1116         echo "\n";
1117         echo '<description><![CDATA['.$html.']]></description>'."\n</item>\n\n";
1118
1119     }
1120     echo '</channel></rss><!-- Cached version of '.htmlspecialchars(pageUrl()).' -->';
1121
1122     $cache->cache(ob_get_contents());
1123     ob_end_flush();
1124     exit;
1125 }
1126
1127 // "Daily" page.
1128 function showDaily()
1129 {
1130     $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if used it not logged in).
1131
1132
1133     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
1134     if (isset($_GET['day'])) $day=$_GET['day'];
1135
1136     $days = $LINKSDB->days();
1137     $i = array_search($day,$days);
1138     if ($i==false) { $i=count($days)-1; $day=$days[$i]; }
1139     $previousday='';
1140     $nextday='';
1141     if ($i!==false)
1142     {
1143         if ($i>1) $previousday=$days[$i-1];
1144         if ($i<count($days)-1) $nextday=$days[$i+1];
1145     }
1146
1147     $linksToDisplay=$LINKSDB->filterDay($day);
1148     // We pre-format some fields for proper output.
1149     foreach($linksToDisplay as $key=>$link)
1150     {
1151         $taglist = explode(' ',$link['tags']);
1152         uasort($taglist, 'strcasecmp');
1153         $linksToDisplay[$key]['taglist']=$taglist;
1154         $linksToDisplay[$key]['formatedDescription']=nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($link['description']))));
1155         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
1156     }
1157
1158     /* We need to spread the articles on 3 columns.
1159        I did not want to use a javascript lib like http://masonry.desandro.com/
1160        so I manually spread entries with a simple method: I roughly evaluate the
1161        height of a div according to title and description length.
1162     */
1163     $columns=array(array(),array(),array()); // Entries to display, for each column.
1164     $fill=array(0,0,0);  // Rough estimate of columns fill.
1165     foreach($linksToDisplay as $key=>$link)
1166     {
1167         // Roughly estimate length of entry (by counting characters)
1168         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
1169         // Description: 836 characters gives roughly 342 pixel height.
1170         // This is not perfect, but it's usually ok.
1171         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
1172         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
1173         // Then put in column which is the less filled:
1174         $smallest=min($fill); // find smallest value in array.
1175         $index=array_search($smallest,$fill); // find index of this smallest value.
1176         array_push($columns[$index],$link); // Put entry in this column.
1177         $fill[$index]+=$length;
1178     }
1179     $PAGE = new pageBuilder;
1180     $PAGE->assign('linksToDisplay',$linksToDisplay);
1181     $PAGE->assign('linkcount',count($LINKSDB));
1182     $PAGE->assign('col1',$columns[0]);
1183     $PAGE->assign('col1',$columns[0]);
1184     $PAGE->assign('col2',$columns[1]);
1185     $PAGE->assign('col3',$columns[2]);
1186     $PAGE->assign('day',utf8_encode(strftime('%A %d, %B %Y',linkdate2timestamp($day.'_000000'))));
1187     $PAGE->assign('previousday',$previousday);
1188     $PAGE->assign('nextday',$nextday);
1189     $PAGE->renderPage('daily');
1190     exit;
1191 }
1192
1193
1194 // ------------------------------------------------------------------------------------------
1195 // Render HTML page (according to URL parameters and user rights)
1196 function renderPage()
1197 {
1198     $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if used it not logged in).
1199
1200     // -------- Display login form.
1201     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=login'))
1202     {
1203         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1204         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1205         $PAGE = new pageBuilder;
1206         $PAGE->assign('token',$token);
1207         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER']:''));
1208         $PAGE->renderPage('loginform');
1209         exit;
1210     }
1211     // -------- User wants to logout.
1212     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1213     {
1214         invalidateCaches();
1215         logout();
1216         header('Location: ?');
1217         exit;
1218     }
1219
1220     // -------- Picture wall
1221     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=picwall'))
1222     {
1223         // Optionnaly filter the results:
1224         $links=array();
1225         if (!empty($_GET['searchterm'])) $links = $LINKSDB->filterFulltext($_GET['searchterm']);
1226         elseif (!empty($_GET['searchtags']))   $links = $LINKSDB->filterTags(trim($_GET['searchtags']));
1227         else $links = $LINKSDB;
1228         $body='';
1229         $linksToDisplay=array();
1230
1231         // Get only links which have a thumbnail.
1232         foreach($links as $link)
1233         {
1234             $permalink='?'.htmlspecialchars(smallhash($link['linkdate']),ENT_QUOTES);
1235             $thumb=lazyThumbnail($link['url'],$permalink);
1236             if ($thumb!='') // Only output links which have a thumbnail.
1237             {
1238                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1239                 $link['permalink']=$permalink;
1240                 $linksToDisplay[]=$link; // Add to array.
1241             }
1242         }
1243         $PAGE = new pageBuilder;
1244         $PAGE->assign('linkcount',count($LINKSDB));
1245         $PAGE->assign('linksToDisplay',$linksToDisplay);
1246         $PAGE->renderPage('picwall');
1247         exit;
1248     }
1249
1250     // -------- Tag cloud
1251     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tagcloud'))
1252     {
1253         $tags= $LINKSDB->allTags();
1254         // We sort tags alphabetically, then choose a font size according to count.
1255         // First, find max value.
1256         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1257         ksort($tags);
1258         $tagList=array();
1259         foreach($tags as $key=>$value)
1260         {
1261             $tagList[$key] = array('count'=>$value,'size'=>max(40*$value/$maxcount,8));
1262         }
1263         $PAGE = new pageBuilder;
1264         $PAGE->assign('linkcount',count($LINKSDB));
1265         $PAGE->assign('tags',$tagList);
1266         $PAGE->renderPage('tagcloud');
1267         exit;
1268     }
1269
1270     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1271     if (isset($_GET['addtag']))
1272     {
1273         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1274         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1275         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1276         $params['searchtags'] = (empty($params['searchtags']) ?  trim($_GET['addtag']) : trim($params['searchtags']).' '.trim($_GET['addtag']));
1277         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1278         header('Location: ?'.http_build_query($params));
1279         exit;
1280     }
1281
1282     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1283     if (isset($_GET['removetag']))
1284     {
1285         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1286         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?'); exit; } // In case browser does not send HTTP_REFERER
1287         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1288         if (isset($params['searchtags']))
1289         {
1290             $tags = explode(' ',$params['searchtags']);
1291             $tags=array_diff($tags, array($_GET['removetag'])); // Remove value from array $tags.
1292             if (count($tags)==0) unset($params['searchtags']); else $params['searchtags'] = implode(' ',$tags);
1293             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1294         }
1295         header('Location: ?'.http_build_query($params));
1296         exit;
1297     }
1298
1299     // -------- User wants to change the number of links per page (linksperpage=...)
1300     if (isset($_GET['linksperpage']))
1301     {
1302         if (is_numeric($_GET['linksperpage'])) { $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage'])); }
1303         // Make sure the referer is from Shaarli itself.
1304         $referer = '?';
1305         if (!empty($_SERVER['HTTP_REFERER']) && strcmp(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST),$_SERVER['HTTP_HOST'])==0)
1306             $referer = $_SERVER['HTTP_REFERER'];
1307         header('Location: '.$referer);
1308         exit;
1309     }
1310
1311     // -------- User wants to see only private links (toggle)
1312     if (isset($_GET['privateonly']))
1313     {
1314         if (empty($_SESSION['privateonly']))
1315         {
1316             $_SESSION['privateonly']=1; // See only private links
1317         }
1318         else
1319         {
1320             unset($_SESSION['privateonly']); // See all links
1321         }
1322         // Make sure the referer is from Shaarli itself.
1323         $referer = '?';
1324         if (!empty($_SERVER['HTTP_REFERER']) && strcmp(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST),$_SERVER['HTTP_HOST'])==0)
1325             $referer = $_SERVER['HTTP_REFERER'];
1326         header('Location: '.$referer);
1327         exit;
1328     }
1329
1330     // -------- Handle other actions allowed for non-logged in users:
1331     if (!isLoggedIn())
1332     {
1333         // User tries to post new link but is not loggedin:
1334         // Show login screen, then redirect to ?post=...
1335         if (isset($_GET['post']))
1336         {
1337             header('Location: ?do=login&post='.urlencode($_GET['post']).(!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').(!empty($_GET['source'])?'&source='.urlencode($_GET['source']):'')); // Redirect to login page, then back to post link.
1338             exit;
1339         }
1340         $PAGE = new pageBuilder;
1341         buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1342         $PAGE->renderPage('linklist');
1343         exit; // Never remove this one ! All operations below are reserved for logged in user.
1344     }
1345
1346     // -------- All other functions are reserved for the registered user:
1347
1348     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1349     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tools'))
1350     {
1351         $PAGE = new pageBuilder;
1352         $PAGE->assign('linkcount',count($LINKSDB));
1353         $PAGE->assign('pageabsaddr',indexUrl());
1354         $PAGE->renderPage('tools');
1355         exit;
1356     }
1357
1358     // -------- User wants to change his/her password.
1359     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changepasswd'))
1360     {
1361         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1362         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1363         {
1364             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away !
1365
1366             // Make sure old password is correct.
1367             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1368             if ($oldhash!=$GLOBALS['hash']) { echo '<script language="JavaScript">alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1369             // Save new password
1370             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1371             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1372             writeConfig();
1373             echo '<script language="JavaScript">alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1374             exit;
1375         }
1376         else // show the change password form.
1377         {
1378             $PAGE = new pageBuilder;
1379             $PAGE->assign('linkcount',count($LINKSDB));
1380             $PAGE->assign('token',getToken());
1381             $PAGE->renderPage('changepassword');
1382             exit;
1383         }
1384     }
1385
1386     // -------- User wants to change configuration
1387     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=configure'))
1388     {
1389         if (!empty($_POST['title']) )
1390         {
1391             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away !
1392             $tz = 'UTC';
1393             if (!empty($_POST['continent']) && !empty($_POST['city']))
1394                 if (isTZvalid($_POST['continent'],$_POST['city']))
1395                     $tz = $_POST['continent'].'/'.$_POST['city'];
1396             $GLOBALS['timezone'] = $tz;
1397             $GLOBALS['title']=$_POST['title'];
1398             $GLOBALS['redirector']=$_POST['redirector'];
1399             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1400             $GLOBALS['disablejquery']=!empty($_POST['disablejquery']);
1401             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1402             writeConfig();
1403             echo '<script language="JavaScript">alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1404             exit;
1405         }
1406         else // Show the configuration form.
1407         {
1408             $PAGE = new pageBuilder;
1409             $PAGE->assign('linkcount',count($LINKSDB));
1410             $PAGE->assign('token',getToken());
1411             $PAGE->assign('title',htmlspecialchars( empty($GLOBALS['title']) ? '' : $GLOBALS['title'] , ENT_QUOTES));
1412             $PAGE->assign('redirector',htmlspecialchars( empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] , ENT_QUOTES));
1413             list($timezone_form,$timezone_js) = templateTZform($GLOBALS['timezone']);
1414             $PAGE->assign('timezone_form',$timezone_form); // FIXME: put entire tz form generation in template ?
1415             $PAGE->assign('timezone_js',$timezone_js);
1416             $PAGE->renderPage('configure');
1417             exit;
1418         }
1419     }
1420
1421     // -------- User wants to rename a tag or delete it
1422     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changetag'))
1423     {
1424         if (empty($_POST['fromtag']))
1425         {
1426             $PAGE = new pageBuilder;
1427             $PAGE->assign('linkcount',count($LINKSDB));
1428             $PAGE->assign('token',getToken());
1429             $PAGE->renderPage('changetag');
1430             exit;
1431         }
1432         if (!tokenOk($_POST['token'])) die('Wrong token.');
1433
1434         // Delete a tag:
1435         if (!empty($_POST['deletetag']) && !empty($_POST['fromtag']))
1436         {
1437             $needle=trim($_POST['fromtag']);
1438             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
1439             foreach($linksToAlter as $key=>$value)
1440             {
1441                 $tags = explode(' ',trim($value['tags']));
1442                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1443                 $value['tags']=trim(implode(' ',$tags));
1444                 $LINKSDB[$key]=$value;
1445             }
1446             $LINKSDB->savedb(); // save to disk
1447             echo '<script language="JavaScript">alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1448             exit;
1449         }
1450
1451         // Rename a tag:
1452         if (!empty($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag']))
1453         {
1454             $needle=trim($_POST['fromtag']);
1455             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
1456             foreach($linksToAlter as $key=>$value)
1457             {
1458                 $tags = explode(' ',trim($value['tags']));
1459                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Remplace tags value.
1460                 $value['tags']=trim(implode(' ',$tags));
1461                 $LINKSDB[$key]=$value;
1462             }
1463             $LINKSDB->savedb(); // save to disk
1464             echo '<script language="JavaScript">alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1465             exit;
1466         }
1467     }
1468
1469     // -------- User wants to add a link without using the bookmarklet: show form.
1470     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=addlink'))
1471     {
1472         $PAGE = new pageBuilder;
1473         $PAGE->assign('linkcount',count($LINKSDB));
1474         $PAGE->renderPage('addlink');
1475         exit;
1476     }
1477
1478     // -------- User clicked the "Save" button when editing a link: Save link to database.
1479     if (isset($_POST['save_edit']))
1480     {
1481         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away !
1482         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1483         $linkdate=$_POST['lf_linkdate'];
1484         $url = trim($_POST['lf_url']);
1485         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?'))
1486             $url = 'http://'.$url;
1487         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1488                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1489         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1490         $LINKSDB[$linkdate] = $link;
1491         $LINKSDB->savedb(); // save to disk
1492         pubsubhub();
1493
1494         // If we are called from the bookmarklet, we must close the popup:
1495         if (isset($_GET['source']) && $_GET['source']=='bookmarklet') { echo '<script language="JavaScript">self.close();</script>'; exit; }
1496         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1497         $returnurl .= '#'.smallHash($linkdate);  // Scroll to the link which has been edited.
1498         header('Location: '.$returnurl); // After saving the link, redirect to the page the user was on.
1499         exit;
1500     }
1501
1502     // -------- User clicked the "Cancel" button when editing a link.
1503     if (isset($_POST['cancel_edit']))
1504     {
1505         // If we are called from the bookmarklet, we must close the popup;
1506         if (isset($_GET['source']) && $_GET['source']=='bookmarklet') { echo '<script language="JavaScript">self.close();</script>'; exit; }
1507         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1508         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1509         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1510         exit;
1511     }
1512
1513     // -------- User clicked the "Delete" button when editing a link : Delete link from database.
1514     if (isset($_POST['delete_link']))
1515     {
1516         if (!tokenOk($_POST['token'])) die('Wrong token.');
1517         // We do not need to ask for confirmation:
1518         // - confirmation is handled by javascript
1519         // - we are protected from XSRF by the token.
1520         $linkdate=$_POST['lf_linkdate'];
1521         unset($LINKSDB[$linkdate]);
1522         $LINKSDB->savedb(); // save to disk
1523
1524         // If we are called from the bookmarklet, we must close the popup:
1525         if (isset($_GET['source']) && $_GET['source']=='bookmarklet') { echo '<script language="JavaScript">self.close();</script>'; exit; }
1526         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1527         if ($returnurl=='?') { $returnurl = (isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : '?'); }
1528         header('Location: '.$returnurl); // After deleting the link, redirect to the page the user was on.
1529         exit;
1530     }
1531
1532     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1533     if (isset($_GET['edit_link']))
1534     {
1535         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1536         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1537         $PAGE = new pageBuilder;
1538         $PAGE->assign('linkcount',count($LINKSDB));
1539         $PAGE->assign('link',$link);
1540         $PAGE->assign('link_is_new',false);
1541         $PAGE->assign('token',getToken()); // XSRF protection.
1542         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : ''));
1543         $PAGE->renderPage('editlink');
1544         exit;
1545     }
1546
1547     // -------- User want to post a new link: Display link edit form.
1548     if (isset($_GET['post']))
1549     {
1550         $url=$_GET['post'];
1551
1552         // We remove the annoying parameters added by FeedBurner and GoogleFeedProxy (?utm_source=...)
1553         $i=strpos($url,'&utm_source='); if ($i!==false) $url=substr($url,0,$i);
1554         $i=strpos($url,'?utm_source='); if ($i!==false) $url=substr($url,0,$i);
1555         $i=strpos($url,'#xtor=RSS-'); if ($i!==false) $url=substr($url,0,$i);
1556
1557         $link_is_new = false;
1558         $link = $LINKSDB->getLinkFromUrl($url); // Check if URL is not already in database (in this case, we will edit the existing link)
1559         if (!$link)
1560         {
1561             $link_is_new = true;  // This is a new link
1562             $linkdate = strval(date('Ymd_His'));
1563             $title = (empty($_GET['title']) ? '' : $_GET['title'] ); // Get title if it was provided in URL (by the bookmarklet).
1564             $description = (empty($_GET['description']) ? '' : $_GET['description']); // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1565             $tags = (empty($_GET['tags']) ? '' : $_GET['tags'] ); // Get tags if it was provided in URL
1566             $private = (!empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0); // Get private if it was provided in URL
1567             if (($url!='') && parse_url($url,PHP_URL_SCHEME)=='') $url = 'http://'.$url;
1568             // If this is an HTTP link, we try go get the page to extact the title (otherwise we will to straight to the edit form.)
1569             if (empty($title) && parse_url($url,PHP_URL_SCHEME)=='http')
1570             {
1571                 list($status,$headers,$data) = getHTTP($url,4); // Short timeout to keep the application responsive.
1572                 // FIXME: Decode charset according to specified in either 1) HTTP response headers or 2) <head> in html
1573                 if (strpos($status,'200 OK')!==false)
1574                                          {
1575                         // Look for charset in html header.
1576                                                 preg_match('#<meta .*charset=.*>#Usi', $data, $meta);
1577
1578                                                 // If found, extract encoding.
1579                                                 if (!empty($meta[0]))
1580                                                 {
1581                                                         // Get encoding specified in header.
1582                                                         preg_match('#charset="?(.*)"#si', $meta[0], $enc);
1583                                                         // If charset not found, use utf-8.
1584                                                         $html_charset = (!empty($enc[1])) ? strtolower($enc[1]) : 'utf-8';
1585                                                 }
1586                                                 else { $html_charset = 'utf-8'; }
1587
1588                                                 // Extract title
1589                                                 $title = html_extract_title($data);
1590                                                 if (!empty($title))
1591                                                 {
1592                                                         // Re-encode title in utf-8 if necessary.
1593                                                         $title = ($html_charset == 'iso-8859-1') ? utf8_encode($title) : $title;
1594                                                 }
1595                                         }
1596             }
1597             if ($url=='') $url='?'.smallHash($linkdate); // In case of empty URL, this is just a text (with a link that point to itself)
1598             $link = array('linkdate'=>$linkdate,'title'=>$title,'url'=>$url,'description'=>$description,'tags'=>$tags,'private'=>$private);
1599         }
1600
1601         $PAGE = new pageBuilder;
1602         $PAGE->assign('linkcount',count($LINKSDB));
1603         $PAGE->assign('link',$link);
1604         $PAGE->assign('link_is_new',$link_is_new);
1605         $PAGE->assign('token',getToken()); // XSRF protection.
1606         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : ''));
1607         $PAGE->renderPage('editlink');
1608         exit;
1609     }
1610
1611     // -------- Export as Netscape Bookmarks HTML file.
1612     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=export'))
1613     {
1614         if (empty($_GET['what']))
1615         {
1616             $PAGE = new pageBuilder;
1617             $PAGE->assign('linkcount',count($LINKSDB));
1618             $PAGE->renderPage('export');
1619             exit;
1620         }
1621         $exportWhat=$_GET['what'];
1622         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export ???');
1623
1624         header('Content-Type: text/html; charset=utf-8');
1625         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1626         $currentdate=date('Y/m/d H:i:s');
1627         echo <<<HTML
1628 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1629 <!-- This is an automatically generated file.
1630      It will be read and overwritten.
1631      DO NOT EDIT! -->
1632 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1633 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1634 <TITLE>Bookmarks</TITLE>
1635 <H1>Bookmarks</H1>
1636 HTML;
1637         foreach($LINKSDB as $link)
1638         {
1639             if ($exportWhat=='all' ||
1640                ($exportWhat=='private' && $link['private']!=0) ||
1641                ($exportWhat=='public' && $link['private']==0))
1642             {
1643                 echo '<DT><A HREF="'.htmlspecialchars($link['url']).'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1644                 if ($link['tags']!='') echo ' TAGS="'.htmlspecialchars(str_replace(' ',',',$link['tags'])).'"';
1645                 echo '>'.htmlspecialchars($link['title'])."</A>\n";
1646                 if ($link['description']!='') echo '<DD>'.htmlspecialchars($link['description'])."\n";
1647             }
1648         }
1649                 exit;
1650     }
1651
1652     // -------- User is uploading a file for import
1653     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1654     {
1655         // If file is too big, some form field may be missing.
1656         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1657         {
1658             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1659             echo '<script language="JavaScript">alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.htmlspecialchars($returnurl).'\';</script>';
1660             exit;
1661         }
1662         if (!tokenOk($_POST['token'])) die('Wrong token.');
1663         importFile();
1664         exit;
1665     }
1666
1667     // -------- Show upload/import dialog:
1668     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=import'))
1669     {
1670         $PAGE = new pageBuilder;
1671         $PAGE->assign('linkcount',count($LINKSDB));
1672         $PAGE->assign('token',getToken());
1673         $PAGE->assign('maxfilesize',getMaxFileSize());
1674         $PAGE->renderPage('import');
1675         exit;
1676     }
1677
1678     // -------- Otherwise, simply display search form and links:
1679     $PAGE = new pageBuilder;
1680     $PAGE->assign('linkcount',count($LINKSDB));
1681     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1682     $PAGE->renderPage('linklist');
1683     exit;
1684 }
1685
1686 // -----------------------------------------------------------------------------------------------
1687 // Process the import file form.
1688 function importFile()
1689 {
1690     if (!(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'])) { die('Not allowed.'); }
1691     $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if used it not logged in).
1692     $filename=$_FILES['filetoupload']['name'];
1693     $filesize=$_FILES['filetoupload']['size'];
1694     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1695     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private ?
1696     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones ?
1697     $import_count=0;
1698
1699     // Sniff file type:
1700     $type='unknown';
1701     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1702
1703     // Then import the bookmarks.
1704     if ($type=='netscape')
1705     {
1706         // This is a standard Netscape-style bookmark file.
1707         // This format is supported by all browsers (except IE, of course), also delicious, diigo and others.
1708         foreach(explode('<DT>',$data) as $html) // explode is very fast
1709         {
1710             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1711             $d = explode('<DD>',$html);
1712             if (startswith($d[0],'<A '))
1713             {
1714                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1715                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1716                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1717                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1718                 $raw_add_date=0;
1719                 foreach($matches as $m)
1720                 {
1721                     $attr=$m[1]; $value=$m[2];
1722                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1723                     elseif ($attr=='ADD_DATE')
1724                     {
1725                         $raw_add_date=intval($value);
1726                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1727                     }
1728                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1729                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1730                 }
1731                 if ($link['url']!='')
1732                 {
1733                     if ($private==1) $link['private']=1;
1734                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1735                     if ($dblink==false)
1736                     {  // Link not in database, let's import it...
1737                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1738
1739                        // Make sure date/time is not already used by another link.
1740                        // (Some bookmark files have several different links with the same ADD_DATE)
1741                        // We increment date by 1 second until we find a date which is not used in db.
1742                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1743                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1744                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1745                        $LINKSDB[$link['linkdate']] = $link;
1746                        $import_count++;
1747                     }
1748                     else // link already present in database.
1749                     {
1750                         if ($overwrite)
1751                         {   // If overwrite is required, we import link data, except date/time.
1752                             $link['linkdate']=$dblink['linkdate'];
1753                             $LINKSDB[$link['linkdate']] = $link;
1754                             $import_count++;
1755                         }
1756                     }
1757
1758                 }
1759             }
1760         }
1761         $LINKSDB->savedb();
1762
1763         echo '<script language="JavaScript">alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1764     }
1765     else
1766     {
1767         echo '<script language="JavaScript">alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1768     }
1769 }
1770
1771 // -----------------------------------------------------------------------------------------------
1772 // Template for the list of links (<div id="linklist">)
1773 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1774 function buildLinkList($PAGE,$LINKSDB)
1775 {
1776     // ---- Filter link database according to parameters
1777     $linksToDisplay=array();
1778     $search_type='';
1779     $search_crits='';
1780     if (isset($_GET['searchterm'])) // Fulltext search
1781     {
1782         $linksToDisplay = $LINKSDB->filterFulltext(trim($_GET['searchterm']));
1783         $search_crits=htmlspecialchars(trim($_GET['searchterm']));
1784         $search_type='fulltext';
1785     }
1786     elseif (isset($_GET['searchtags'])) // Search by tag
1787     {
1788         $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
1789         $search_crits=explode(' ',trim($_GET['searchtags']));
1790         $search_type='tags';
1791     }
1792     elseif (isset($_SERVER['QUERY_STRING']) && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/',$_SERVER['QUERY_STRING'])) // Detect smallHashes in URL
1793     {
1794         $linksToDisplay = $LINKSDB->filterSmallHash(substr(trim($_SERVER["QUERY_STRING"], '/'),0,6));
1795         if (count($linksToDisplay)==0)
1796         {
1797             header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
1798             echo '<h1>404 Not found.</h1>Oh crap. The link you are trying to reach does not exist or has been deleted.';
1799             echo '<br>You would mind <a href="?">clicking here</a> ?';
1800             exit;
1801         }
1802         $search_type='permalink';
1803     }
1804     else
1805         $linksToDisplay = $LINKSDB;  // otherwise, display without filtering.
1806
1807     // Option: Show only private links
1808     if (!empty($_SESSION['privateonly']))
1809     {
1810         $tmp = array();
1811         foreach($linksToDisplay as $linkdate=>$link)
1812         {
1813             if ($link['private']!=0) $tmp[$linkdate]=$link;
1814         }
1815         $linksToDisplay=$tmp;
1816     }
1817
1818     // ---- Handle paging.
1819     /* Can someone explain to me why you get the following error when using array_keys() on an object which implements the interface ArrayAccess ???
1820        "Warning: array_keys() expects parameter 1 to be array, object given in ... "
1821        If my class implements ArrayAccess, why won't array_keys() accept it ?  ( $keys=array_keys($linksToDisplay); )
1822     */
1823     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; } // Stupid and ugly. Thanks php.
1824
1825     // If there is only a single link, we change on-the-fly the title of the page.
1826     if (count($linksToDisplay)==1) $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1827
1828     // Select articles according to paging.
1829     $pagecount = ceil(count($keys)/$_SESSION['LINKS_PER_PAGE']);
1830     $pagecount = ($pagecount==0 ? 1 : $pagecount);
1831     $page=( empty($_GET['page']) ? 1 : intval($_GET['page']));
1832     $page = ( $page<1 ? 1 : $page );
1833     $page = ( $page>$pagecount ? $pagecount : $page );
1834     $i = ($page-1)*$_SESSION['LINKS_PER_PAGE']; // Start index.
1835     $end = $i+$_SESSION['LINKS_PER_PAGE'];
1836     $linkDisp=array(); // Links to display
1837     while ($i<$end && $i<count($keys))
1838     {
1839         $link = $linksToDisplay[$keys[$i]];
1840         $link['description']=nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($link['description']))));
1841         $title=$link['title'];
1842         $classLi =  $i%2!=0 ? '' : 'publicLinkHightLight';
1843         $link['class'] = ($link['private']==0 ? $classLi : 'private');
1844         $link['localdate']=linkdate2locale($link['linkdate']);
1845         $taglist = explode(' ',$link['tags']);
1846         uasort($taglist, 'strcasecmp');
1847         $link['taglist']=$taglist;
1848         $linkDisp[$keys[$i]] = $link;
1849         $i++;
1850     }
1851
1852     // Compute paging navigation
1853     $searchterm= ( empty($_GET['searchterm']) ? '' : '&searchterm='.$_GET['searchterm'] );
1854     $searchtags= ( empty($_GET['searchtags']) ? '' : '&searchtags='.$_GET['searchtags'] );
1855     $paging='';
1856     $previous_page_url=''; if ($i!=count($keys)) $previous_page_url='?page='.($page+1).$searchterm.$searchtags;
1857     $next_page_url='';if ($page>1) $next_page_url='?page='.($page-1).$searchterm.$searchtags;
1858
1859     $token = ''; if (isLoggedIn()) $token=getToken();
1860
1861     // Fill all template fields.
1862     $PAGE->assign('linkcount',count($LINKSDB));
1863     $PAGE->assign('previous_page_url',$previous_page_url);
1864     $PAGE->assign('next_page_url',$next_page_url);
1865     $PAGE->assign('page_current',$page);
1866     $PAGE->assign('page_max',$pagecount);
1867     $PAGE->assign('result_count',count($linksToDisplay));
1868     $PAGE->assign('search_type',$search_type);
1869     $PAGE->assign('search_crits',$search_crits);
1870     $PAGE->assign('redirector',empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector']); // optional redirector URL
1871     $PAGE->assign('token',$token);
1872     $PAGE->assign('links',$linkDisp);
1873     return;
1874 }
1875
1876 // Compute the thumbnail for a link.
1877 //
1878 // with a link to the original URL.
1879 // Understands various services (youtube.com...)
1880 // Input: $url = url for which the thumbnail must be found.
1881 //        $href = if provided, this URL will be followed instead of $url
1882 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1883 // Some of them may be missing.
1884 // Return an empty array if no thumbnail available.
1885 function computeThumbnail($url,$href=false)
1886 {
1887     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
1888     if ($href==false) $href=$url;
1889
1890     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1891     // (eg. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1892     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1893     $domain = parse_url($url,PHP_URL_HOST);
1894     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1895     {
1896         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1897         if (!empty($params['v'])) return array('src'=>'http://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1898                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1899     }
1900     if ($domain=='youtu.be') // Youtube short links
1901     {
1902         $path = parse_url($url,PHP_URL_PATH);
1903         return array('src'=>'http://img.youtube.com/vi'.$path.'/default.jpg',
1904                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1905     }
1906     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1907     {
1908         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1909         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1910                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1911     }
1912
1913     if ($domain=='imgur.com')
1914     {
1915         $path = parse_url($url,PHP_URL_PATH);
1916         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1917         if (startsWith($path,'/r/')) return array('src'=>'http://i.imgur.com/'.basename($path).'s.jpg',
1918                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1919         if (startsWith($path,'/gallery/')) return array('src'=>'http://i.imgur.com'.substr($path,8).'s.jpg',
1920                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1921
1922         if (substr_count($path,'/')==1) return array('src'=>'http://i.imgur.com/'.substr($path,1).'s.jpg',
1923                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1924     }
1925     if ($domain=='i.imgur.com')
1926     {
1927         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1928         if (!empty($pi['filename'])) return array('src'=>'http://i.imgur.com/'.$pi['filename'].'s.jpg',
1929                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1930     }
1931     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1932     {
1933         if (strpos($url,'dailymotion.com/video/')!==false)
1934         {
1935             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1936             return array('src'=>$thumburl,
1937                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1938         }
1939     }
1940     if (endsWith($domain,'.imageshack.us'))
1941     {
1942         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1943         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1944         {
1945             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1946             return array('src'=>$thumburl,
1947                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1948         }
1949     }
1950
1951     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1952     // So we deport the thumbnail generation in order not to slow down page generation
1953     // (and we also cache the thumbnail)
1954
1955     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1956
1957     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1958         || $domain=='vimeo.com'
1959         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1960         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1961     )
1962     {
1963         if ($domain=='vimeo.com')
1964         {   // Make sure this vimeo url points to a video (/xxx... where xxx is numeric)
1965             $path = parse_url($url,PHP_URL_PATH);
1966             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1967         }
1968         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
1969         {   // Make sure this url points to a single comic (/xxx... where xxx is numeric)
1970             $path = parse_url($url,PHP_URL_PATH);
1971             if (!preg_match('!/\d+.+?!',$path)) return array();
1972         }
1973         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
1974         {   // Make sure this TED url points to a video (/talks/...)
1975             $path = parse_url($url,PHP_URL_PATH);
1976             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
1977         }
1978         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1979         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.htmlspecialchars($sign).'&url='.urlencode($url),
1980                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1981     }
1982
1983     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1984     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1985     // But using the extension will do.
1986     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1987     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1988     {
1989         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1990         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.htmlspecialchars($sign).'&url='.urlencode($url),
1991                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1992     }
1993     return array(); // No thumbnail.
1994
1995 }
1996
1997
1998 // Returns the HTML code to display a thumbnail for a link
1999 // with a link to the original URL.
2000 // Understands various services (youtube.com...)
2001 // Input: $url = url for which the thumbnail must be found.
2002 //        $href = if provided, this URL will be followed instead of $url
2003 // Returns '' if no thumbnail available.
2004 function thumbnail($url,$href=false)
2005 {
2006     $t = computeThumbnail($url,$href);
2007     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2008
2009     $html='<a href="'.htmlspecialchars($t['href']).'"><img src="'.htmlspecialchars($t['src']).'"';
2010     if (!empty($t['width']))  $html.=' width="'.htmlspecialchars($t['width']).'"';
2011     if (!empty($t['height'])) $html.=' height="'.htmlspecialchars($t['height']).'"';
2012     if (!empty($t['style']))  $html.=' style="'.htmlspecialchars($t['style']).'"';
2013     if (!empty($t['alt']))    $html.=' alt="'.htmlspecialchars($t['alt']).'"';
2014     $html.='></a>';
2015     return $html;
2016 }
2017
2018
2019 // Returns the HTML code to display a thumbnail for a link
2020 // for the picture wall (using lazy image loading)
2021 // Understands various services (youtube.com...)
2022 // Input: $url = url for which the thumbnail must be found.
2023 //        $href = if provided, this URL will be followed instead of $url
2024 // Returns '' if no thumbnail available.
2025 function lazyThumbnail($url,$href=false)
2026 {
2027     $t = computeThumbnail($url,$href);
2028     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2029
2030     $html='<a href="'.htmlspecialchars($t['href']).'">';
2031
2032     // Lazy image (only loaded by javascript when in the viewport).
2033     if (!empty($GLOBALS['disablejquery'])) // (except if jQuery is disabled)
2034         $html.='<img class="lazyimage" src="'.htmlspecialchars($t['src']).'"';
2035     else
2036         $html.='<img class="lazyimage" src="#" data-original="'.htmlspecialchars($t['src']).'"';
2037
2038     if (!empty($t['width']))  $html.=' width="'.htmlspecialchars($t['width']).'"';
2039     if (!empty($t['height'])) $html.=' height="'.htmlspecialchars($t['height']).'"';
2040     if (!empty($t['style']))  $html.=' style="'.htmlspecialchars($t['style']).'"';
2041     if (!empty($t['alt']))    $html.=' alt="'.htmlspecialchars($t['alt']).'"';
2042     $html.='>';
2043
2044     // No-javascript fallback.
2045     $html.='<noscript><img src="'.htmlspecialchars($t['src']).'"';
2046     if (!empty($t['width']))  $html.=' width="'.htmlspecialchars($t['width']).'"';
2047     if (!empty($t['height'])) $html.=' height="'.htmlspecialchars($t['height']).'"';
2048     if (!empty($t['style']))  $html.=' style="'.htmlspecialchars($t['style']).'"';
2049     if (!empty($t['alt']))    $html.=' alt="'.htmlspecialchars($t['alt']).'"';
2050     $html.='></noscript></a>';
2051
2052     return $html;
2053 }
2054
2055
2056 // -----------------------------------------------------------------------------------------------
2057 // Installation
2058 // This function should NEVER be called if the file data/config.php exists.
2059 function install()
2060 {
2061     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2062     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2063
2064
2065     // This part makes sure sessions works correctly.
2066     // (Because on some hosts, session.save_path may not be set correctly,
2067     // or we may not have write access to it.)
2068     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2069     {   // Step 2: Check if data in session is correct.
2070         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2071         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2072         echo 'It currently points to '.session_save_path().'<br><br><a href="?">Click to try again.</a></pre>';
2073         die;
2074     }
2075     if (!isset($_SESSION['session_tested']))
2076     {   // Step 1 : Try to store data in session and reload page.
2077         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2078         header('Location: '.indexUrl().'?test_session');  // Redirect to check stored data.
2079     }
2080     if (isset($_GET['test_session']))
2081     {   // Step 3: Sessions are ok. Remove test parameter from URL.
2082         header('Location: '.indexUrl());
2083     }
2084
2085
2086     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2087     {
2088         $tz = 'UTC';
2089         if (!empty($_POST['continent']) && !empty($_POST['city']))
2090             if (isTZvalid($_POST['continent'],$_POST['city']))
2091                 $tz = $_POST['continent'].'/'.$_POST['city'];
2092         $GLOBALS['timezone'] = $tz;
2093         // Everything is ok, let's create config file.
2094         $GLOBALS['login'] = $_POST['setlogin'];
2095         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2096         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2097         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.htmlspecialchars(indexUrl()) : $_POST['title'] );
2098         writeConfig();
2099         echo '<script language="JavaScript">alert("Shaarli is now configured. Please enter your login/password and start shaaring your links !");document.location=\'?do=login\';</script>';
2100         exit;
2101     }
2102
2103     // Display config form:
2104     list($timezone_form,$timezone_js) = templateTZform();
2105     $timezone_html=''; if ($timezone_form!='') $timezone_html='<tr><td valign="top"><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2106
2107     $PAGE = new pageBuilder;
2108     $PAGE->assign('timezone_html',$timezone_html);
2109     $PAGE->assign('timezone_js',$timezone_js);
2110     $PAGE->renderPage('install');
2111     exit;
2112 }
2113
2114 // Generates the timezone selection form and javascript.
2115 // Input: (optional) current timezone (can be 'UTC/UTC'). It will be pre-selected.
2116 // Output: array(html,js)
2117 // Example: list($htmlform,$js) = templateTZform('Europe/Paris');  // Europe/Paris pre-selected.
2118 // Returns array('','') if server does not support timezones list. (eg. php 5.1 on free.fr)
2119 function templateTZform($ptz=false)
2120 {
2121     if (function_exists('timezone_identifiers_list')) // because of old php version (5.1) which can be found on free.fr
2122     {
2123         // Try to split the provided timezone.
2124         if ($ptz==false) { $l=timezone_identifiers_list(); $ptz=$l[0]; }
2125         $spos=strpos($ptz,'/'); $pcontinent=substr($ptz,0,$spos); $pcity=substr($ptz,$spos+1);
2126
2127         // Display config form:
2128         $timezone_form = '';
2129         $timezone_js = '';
2130         // The list is in the forme "Europe/Paris", "America/Argentina/Buenos_Aires"...
2131         // We split the list in continents/cities.
2132         $continents = array();
2133         $cities = array();
2134         foreach(timezone_identifiers_list() as $tz)
2135         {
2136             if ($tz=='UTC') $tz='UTC/UTC';
2137             $spos = strpos($tz,'/');
2138             if ($spos!==false)
2139             {
2140                 $continent=substr($tz,0,$spos); $city=substr($tz,$spos+1);
2141                 $continents[$continent]=1;
2142                 if (!isset($cities[$continent])) $cities[$continent]='';
2143                 $cities[$continent].='<option value="'.$city.'"'.($pcity==$city?'selected':'').'>'.$city.'</option>';
2144             }
2145         }
2146         $continents_html = '';
2147         $continents = array_keys($continents);
2148         foreach($continents as $continent)
2149             $continents_html.='<option  value="'.$continent.'"'.($pcontinent==$continent?'selected':'').'>'.$continent.'</option>';
2150         $cities_html = $cities[$pcontinent];
2151         $timezone_form = "Continent: <select name=\"continent\" id=\"continent\" onChange=\"onChangecontinent();\">${continents_html}</select>";
2152         $timezone_form .= "&nbsp;&nbsp;&nbsp;&nbsp;City: <select name=\"city\" id=\"city\">${cities[$pcontinent]}</select><br />";
2153         $timezone_js = "<script language=\"JavaScript\">";
2154         $timezone_js .= "function onChangecontinent(){document.getElementById(\"city\").innerHTML = citiescontinent[document.getElementById(\"continent\").value];}";
2155         $timezone_js .= "var citiescontinent = ".json_encode($cities).";" ;
2156         $timezone_js .= "</script>" ;
2157         return array($timezone_form,$timezone_js);
2158     }
2159     return array('','');
2160 }
2161
2162 // Tells if a timezone is valid or not.
2163 // If not valid, returns false.
2164 // If system does not support timezone list, returns false.
2165 function isTZvalid($continent,$city)
2166 {
2167     $tz = $continent.'/'.$city;
2168     if (function_exists('timezone_identifiers_list')) // because of old php version (5.1) which can be found on free.fr
2169     {
2170         if (in_array($tz, timezone_identifiers_list())) // it's a valid timezone ?
2171                     return true;
2172     }
2173     return false;
2174 }
2175 if (!function_exists('json_encode')) {
2176     function json_encode($data) {
2177         switch ($type = gettype($data)) {
2178             case 'NULL':
2179                 return 'null';
2180             case 'boolean':
2181                 return ($data ? 'true' : 'false');
2182             case 'integer':
2183             case 'double':
2184             case 'float':
2185                 return $data;
2186             case 'string':
2187                 return '"' . addslashes($data) . '"';
2188             case 'object':
2189                 $data = get_object_vars($data);
2190             case 'array':
2191                 $output_index_count = 0;
2192                 $output_indexed = array();
2193                 $output_associative = array();
2194                 foreach ($data as $key => $value) {
2195                     $output_indexed[] = json_encode($value);
2196                     $output_associative[] = json_encode($key) . ':' . json_encode($value);
2197                     if ($output_index_count !== NULL && $output_index_count++ !== $key) {
2198                         $output_index_count = NULL;
2199                     }
2200                 }
2201                 if ($output_index_count !== NULL) {
2202                     return '[' . implode(',', $output_indexed) . ']';
2203                 } else {
2204                     return '{' . implode(',', $output_associative) . '}';
2205                 }
2206             default:
2207                 return ''; // Not supported
2208         }
2209     }
2210 }
2211
2212 // Webservices (for use with jQuery/jQueryUI)
2213 // eg.  index.php?ws=tags&term=minecr
2214 function processWS()
2215 {
2216     if (empty($_GET['ws']) || empty($_GET['term'])) return;
2217     $term = $_GET['term'];
2218     $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if used it not logged in).
2219     header('Content-Type: application/json; charset=utf-8');
2220
2221     // Search in tags (case insentitive, cumulative search)
2222     if ($_GET['ws']=='tags')
2223     {
2224         $tags=explode(' ',str_replace(',',' ',$term)); $last = array_pop($tags); // Get the last term ("a b c d" ==> "a b c", "d")
2225         $addtags=''; if ($tags) $addtags=implode(' ',$tags).' '; // We will pre-pend previous tags
2226         $suggested=array();
2227         /* To speed up things, we store list of tags in session */
2228         if (empty($_SESSION['tags'])) $_SESSION['tags'] = $LINKSDB->allTags();
2229         foreach($_SESSION['tags'] as $key=>$value)
2230         {
2231             if (startsWith($key,$last,$case=false) && !in_array($key,$tags)) $suggested[$addtags.$key.' ']=0;
2232         }
2233         echo json_encode(array_keys($suggested));
2234         exit;
2235     }
2236
2237     // Search a single tag (case sentitive, single tag search)
2238     if ($_GET['ws']=='singletag')
2239     {
2240         /* To speed up things, we store list of tags in session */
2241         if (empty($_SESSION['tags'])) $_SESSION['tags'] = $LINKSDB->allTags();
2242         foreach($_SESSION['tags'] as $key=>$value)
2243         {
2244             if (startsWith($key,$term,$case=true)) $suggested[$key]=0;
2245         }
2246         echo json_encode(array_keys($suggested));
2247         exit;
2248     }
2249 }
2250
2251 // Re-write configuration file according to globals.
2252 // Requires some $GLOBALS to be set (login,hash,salt,title).
2253 // If the config file cannot be saved, an error message is dislayed and the user is redirected to "Tools" menu.
2254 // (otherwise, the function simply returns.)
2255 function writeConfig()
2256 {
2257     if (is_file($GLOBALS['config']['CONFIG_FILE']) && !isLoggedIn()) die('You are not authorized to alter config.'); // Only logged in user can alter config.
2258     $config='<?php $GLOBALS[\'login\']='.var_export($GLOBALS['login'],true).'; $GLOBALS[\'hash\']='.var_export($GLOBALS['hash'],true).'; $GLOBALS[\'salt\']='.var_export($GLOBALS['salt'],true).'; ';
2259     $config .='$GLOBALS[\'timezone\']='.var_export($GLOBALS['timezone'],true).'; date_default_timezone_set('.var_export($GLOBALS['timezone'],true).'); $GLOBALS[\'title\']='.var_export($GLOBALS['title'],true).';';
2260     $config .= '$GLOBALS[\'redirector\']='.var_export($GLOBALS['redirector'],true).'; ';
2261     $config .= '$GLOBALS[\'disablesessionprotection\']='.var_export($GLOBALS['disablesessionprotection'],true).'; ';
2262     $config .= '$GLOBALS[\'disablejquery\']='.var_export($GLOBALS['disablejquery'],true).'; ';
2263     $config .= '$GLOBALS[\'privateLinkByDefault\']='.var_export($GLOBALS['privateLinkByDefault'],true).'; ';
2264     $config .= ' ?>';
2265     if (!file_put_contents($GLOBALS['config']['CONFIG_FILE'],$config) || strcmp(file_get_contents($GLOBALS['config']['CONFIG_FILE']),$config)!=0)
2266     {
2267         echo '<script language="JavaScript">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>';
2268         exit;
2269     }
2270 }
2271
2272 /* Because some f*cking services like Flickr require an extra HTTP request to get the thumbnail URL,
2273    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2274    The following function takes the URL a link (eg. a flickr page) and return the proper thumbnail.
2275    This function is called by passing the url:
2276    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2277    [URL] is the URL of the link (eg. a flickr page)
2278    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2279    The function below will fetch the image from the webservice and store it in the cache.
2280 */
2281 function genThumbnail()
2282 {
2283     // Make sure the parameters in the URL were generated by us.
2284     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2285     if ($sign!=$_GET['hmac']) die('Naughty boy !');
2286
2287     // Let's see if we don't already have the image for this URL in the cache.
2288     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2289     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2290     {   // We have the thumbnail, just serve it:
2291         header('Content-Type: image/jpeg');
2292         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2293         return;
2294     }
2295     // We may also serve a blank image (if service did not respond)
2296     $blankname=hash('sha1',$_GET['url']).'.gif';
2297     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2298     {
2299         header('Content-Type: image/gif');
2300         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2301         return;
2302     }
2303
2304     // Otherwise, generate the thumbnail.
2305     $url = $_GET['url'];
2306     $domain = parse_url($url,PHP_URL_HOST);
2307
2308     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2309     {
2310         // Crude replacement to handle new Flickr domain policy (They prefer www. now)
2311         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2312
2313         // Is this a link to an image, or to a flickr page ?
2314         $imageurl='';
2315         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2316         {  // This is a direct link to an image. eg. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2317             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2318             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2319         }
2320         else // this is a flickr page (html)
2321         {
2322             list($httpstatus,$headers,$data) = getHTTP($url,20); // Get the flickr html page.
2323             if (strpos($httpstatus,'200 OK')!==false)
2324             {
2325                 // Flickr now nicely provides the URL of the thumbnail in each flickr page.
2326                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!',$data,$matches);
2327                 if (!empty($matches[1])) $imageurl=$matches[1];
2328
2329                 // In albums (and some other pages), the link rel="image_src" is not provided,
2330                 // but flickr provides:
2331                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2332                 if ($imageurl=='')
2333                 {
2334                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!',$data,$matches);
2335                     if (!empty($matches[1])) $imageurl=$matches[1];
2336                 }
2337             }
2338         }
2339
2340         if ($imageurl!='')
2341         {   // Let's download the image.
2342             list($httpstatus,$headers,$data) = getHTTP($imageurl,10); // Image is 240x120, so 10 seconds to download should be enough.
2343             if (strpos($httpstatus,'200 OK')!==false)
2344             {
2345                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2346                 header('Content-Type: image/jpeg');
2347                 echo $data;
2348                 return;
2349             }
2350         }
2351     }
2352
2353     elseif ($domain=='vimeo.com' )
2354     {
2355         // This is more complex: we have to perform a HTTP request, then parse the result.
2356         // Maybe we should deport this to javascript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2357         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2358         list($httpstatus,$headers,$data) = getHTTP('http://vimeo.com/api/v2/video/'.htmlspecialchars($vid).'.php',5);
2359         if (strpos($httpstatus,'200 OK')!==false)
2360         {
2361             $t = unserialize($data);
2362             $imageurl = $t[0]['thumbnail_medium'];
2363             // Then we download the image and serve it to our client.
2364             list($httpstatus,$headers,$data) = getHTTP($imageurl,10);
2365             if (strpos($httpstatus,'200 OK')!==false)
2366             {
2367                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2368                 header('Content-Type: image/jpeg');
2369                 echo $data;
2370                 return;
2371             }
2372         }
2373     }
2374
2375     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2376     {
2377         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2378         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2379         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2380         list($httpstatus,$headers,$data) = getHTTP($url,5);
2381         if (strpos($httpstatus,'200 OK')!==false)
2382         {
2383             // Extract the link to the thumbnail
2384             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!',$data,$matches);
2385             if (!empty($matches[1]))
2386             {   // Let's download the image.
2387                 $imageurl=$matches[1];
2388                 list($httpstatus,$headers,$data) = getHTTP($imageurl,20); // No control on image size, so wait long enough.
2389                 if (strpos($httpstatus,'200 OK')!==false)
2390                 {
2391                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2392                     file_put_contents($filepath,$data); // Save image to cache.
2393                     if (resizeImage($filepath))
2394                     {
2395                         header('Content-Type: image/jpeg');
2396                         echo file_get_contents($filepath);
2397                         return;
2398                     }
2399                 }
2400             }
2401         }
2402     }
2403
2404     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2405     {
2406         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2407         // http://xkcd.com/327/
2408         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2409         list($httpstatus,$headers,$data) = getHTTP($url,5);
2410         if (strpos($httpstatus,'200 OK')!==false)
2411         {
2412             // Extract the link to the thumbnail
2413             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!',$data,$matches);
2414             if (!empty($matches[1]))
2415             {   // Let's download the image.
2416                 $imageurl=$matches[1];
2417                 list($httpstatus,$headers,$data) = getHTTP($imageurl,20); // No control on image size, so wait long enough.
2418                 if (strpos($httpstatus,'200 OK')!==false)
2419                 {
2420                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2421                     file_put_contents($filepath,$data); // Save image to cache.
2422                     if (resizeImage($filepath))
2423                     {
2424                         header('Content-Type: image/jpeg');
2425                         echo file_get_contents($filepath);
2426                         return;
2427                     }
2428                 }
2429             }
2430         }
2431     }
2432
2433     else
2434     {
2435         // For all other domains, we try to download the image and make a thumbnail.
2436         list($httpstatus,$headers,$data) = getHTTP($url,30);  // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2437         if (strpos($httpstatus,'200 OK')!==false)
2438         {
2439             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2440             file_put_contents($filepath,$data); // Save image to cache.
2441             if (resizeImage($filepath))
2442             {
2443                 header('Content-Type: image/jpeg');
2444                 echo file_get_contents($filepath);
2445                 return;
2446             }
2447         }
2448     }
2449
2450
2451     // Otherwise, return an empty image (8x8 transparent gif)
2452     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2453     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2454     header('Content-Type: image/gif');
2455     echo $blankgif;
2456 }
2457
2458 // Make a thumbnail of the image (to width: 120 pixels)
2459 // Returns true if success, false otherwise.
2460 function resizeImage($filepath)
2461 {
2462     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2463
2464     // Trick: some stupid people rename GIF as JPEG... or else.
2465     // So we really try to open each image type whatever the extension is.
2466     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2467     $im=false;
2468     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2469     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2470     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2471     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2472     $w = imagesx($im);
2473     $h = imagesy($im);
2474     $ystart = 0; $yheight=$h;
2475     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2476     $nw = 120;   // Desired width
2477     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2478     // Resize image:
2479     $im2 = imagecreatetruecolor($nw,$nh);
2480     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2481     imageinterlace($im2,true); // For progressive JPEG.
2482     $tempname=$filepath.'_TEMP.jpg';
2483     imagejpeg($im2, $tempname, 90);
2484     imagedestroy($im);
2485     imagedestroy($im2);
2486     unlink($filepath);
2487     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2488     return true;
2489 }
2490
2491 // Invalidate caches when the database is changed or the user logs out.
2492 // (eg. tags cache).
2493 function invalidateCaches()
2494 {
2495     unset($_SESSION['tags']);  // Purge cache attached to session.
2496     pageCache::purgeCache();   // Purge page cache shared by sessions.
2497 }
2498
2499 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2500 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2501 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2502 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2503 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=daily')) { showDaily(); exit; }
2504 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'ws=')) { processWS(); exit; } // Webservices (for jQuery/jQueryUI)
2505 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2506 renderPage();
2507 ?>