index.php

   1 <?php
   2 // Shaarli 0.0.45beta - Shaare your links...
   3 // The personal, minimalist, super-fast, no-database Delicious clone. By sebsauvage.net
   4 // http://sebsauvage.net/wiki/doku.php?id=php:shaarli
   5 // Licence: http://www.opensource.org/licenses/zlib-license.php
   6 // Requires: PHP 5.1.x  (but autocomplete fields will only work if you have PHP 5.2.x)
   7 // -----------------------------------------------------------------------------------------------
   8 // NEVER TRUST IN PHP.INI
   9 // Some hosts do not define a default timezone in php.ini,
  10 // so we have to do this for avoid the strict standard error.
  11 date_default_timezone_set('UTC');
  12
  13 // -----------------------------------------------------------------------------------------------
  14 // Hardcoded parameter (These parameters can be overwritten by editing the file /data/config.php)
  15 // You should not touch any code below (or at your own risks!)
  16 $GLOBALS['config']['DATADIR'] = 'data'; // Data subdirectory
  17 $GLOBALS['config']['CONFIG_FILE'] = $GLOBALS['config']['DATADIR'].'/config.php'; // Configuration file (user login/password)
  18 $GLOBALS['config']['DATASTORE'] = $GLOBALS['config']['DATADIR'].'/datastore.php'; // Data storage file.
  19 $GLOBALS['config']['LINKS_PER_PAGE'] = 20; // Default links per page.
  20 $GLOBALS['config']['IPBANS_FILENAME'] = $GLOBALS['config']['DATADIR'].'/ipbans.php'; // File storage for failures and bans.
  21 $GLOBALS['config']['BAN_AFTER'] = 4;        // Ban IP after this many failures.
  22 $GLOBALS['config']['BAN_DURATION'] = 1800;  // Ban duration for IP address after login failures (in seconds) (1800 sec. = 30 minutes)
  23 $GLOBALS['config']['OPEN_SHAARLI'] = false; // If true, anyone can add/edit/delete links without having to login
  24 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false; // If true, the moment when links were saved are not shown to users that are not logged in.
  25 $GLOBALS['config']['SHOW_ATOM'] = false; // If true, an extra "ATOM feed" button will be displayed in the toolbar
  26 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true; // Enable thumbnails in links.
  27 $GLOBALS['config']['CACHEDIR'] = 'cache'; // Cache directory for thumbnails for SLOW services (like flickr)
  28 $GLOBALS['config']['PAGECACHE'] = 'pagecache'; // Page cache directory.
  29 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true; // Enable Shaarli to store thumbnail in a local cache. Disable to reduce web space usage.
  30 $GLOBALS['config']['PUBSUBHUB_URL'] = ''; // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
  31 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp/' ; // Raintpl cache directory  (keep the trailing slash!)
  32 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/' ; // Raintpl template directory (keep the trailing slash!)
  33 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt'; // For updates check of Shaarli.
  34 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400 ; // Updates check frequency for Shaarli. 86400 seconds=24 hours
  35                                           // Note: You must have publisher.php in the same directory as Shaarli index.php
  36 $GLOBALS['config']['ARCHIVE_ORG'] = false; // For each link, add a link to an archived version on archive.org
  37 $GLOBALS['config']['ENABLE_RSS_PERMALINKS'] = true;  // Enable RSS permalinks by default. This corresponds to the default behavior of shaarli before this was added as an option.
  38 $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = false;
  39 // -----------------------------------------------------------------------------------------------
  40 define('shaarli_version','0.0.45beta');
  41 // http://server.com/x/shaarli --> /shaarli/
  42 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
  43
  44 // Force cookie path (but do not change lifetime)
  45 $cookie=session_get_cookie_params();
  46 $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
  47 session_set_cookie_params($cookie['lifetime'],$cookiedir,$_SERVER['SERVER_NAME']); // Set default cookie expiration and path.
  48
  49 // Set session parameters on server side.
  50 define('INACTIVITY_TIMEOUT',3600); // (in seconds). If the user does not access any page within this time, his/her session is considered expired.
  51 ini_set('session.use_cookies', 1);       // Use cookies to store session.
  52 ini_set('session.use_only_cookies', 1);  // Force cookies for session (phpsessionID forbidden in URL).
  53 ini_set('session.use_trans_sid', false); // Prevent PHP form using sessionID in URL if cookies are disabled.
  54 session_name('shaarli');
  55 if (session_id() == '') session_start();  // Start session if needed (Some server auto-start sessions).
  56
  57 // PHP Settings
  58 ini_set('max_input_time','60');  // High execution time in case of problematic imports/exports.
  59 ini_set('memory_limit', '128M');  // Try to set max upload file size and read (May not work on some hosts).
  60 ini_set('post_max_size', '16M');
  61 ini_set('upload_max_filesize', '16M');
  62 checkphpversion();
  63 error_reporting(E_ALL^E_WARNING);  // See all error except warnings.
  64 //error_reporting(-1); // See all errors (for debugging only)
  65
  66 // User configuration
  67 if (is_file($GLOBALS['config']['CONFIG_FILE'])) {
  68     require_once $GLOBALS['config']['CONFIG_FILE'];
  69 }
  70
  71 // Shaarli library
  72 require_once 'application/LinkDB.php';
  73 require_once 'application/Utils.php';
  74 require_once 'application/Config.php';
  75
  76 include "inc/rain.tpl.class.php"; //include Rain TPL
  77 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
  78 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
  79
  80 ob_start();  // Output buffering for the page cache.
  81
  82
  83 // In case stupid admin has left magic_quotes enabled in php.ini:
  84 if (get_magic_quotes_gpc())
  85 {
  86     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
  87     $_POST = array_map('stripslashes_deep', $_POST);
  88     $_GET = array_map('stripslashes_deep', $_GET);
  89     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
  90 }
  91
  92 // Prevent caching on client side or proxy: (yes, it's ugly)
  93 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
  94 header("Cache-Control: no-store, no-cache, must-revalidate");
  95 header("Cache-Control: post-check=0, pre-check=0", false);
  96 header("Pragma: no-cache");
  97
  98 // Directories creations (Note that your web host may require different rights than 705.)
  99 if (!is_writable(realpath(dirname(__FILE__)))) die('<pre>ERROR: Shaarli does not have the right to write in its own directory.</pre>');
 100
 101 // Handling of old config file which do not have the new parameters.
 102 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(indexUrl());
 103 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 104 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 105 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 106 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 107 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 108 // I really need to rewrite Shaarli with a proper configuation manager.
 109
 110 // Run config screen if first run:
 111 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 112     install();
 113 }
 114
 115 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 116 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 117 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 118
 119 // a token depending of deployment salt, user password, and the current ip
 120 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 121
 122 autoLocale(); // Sniff browser language and set date format accordingly.
 123 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 124
 125 //==================================================================================================
 126 // Checking session state (i.e. is the user still logged in)
 127 //==================================================================================================
 128
 129 function setup_login_state() {
 130         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 131         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 132         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 133             $userIsLoggedIn = true;
 134         }
 135         if (!isset($GLOBALS['login'])) {
 136             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 137             $loginFailure = true;
 138         }
 139         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 140             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 141             !$loginFailure)
 142         {
 143             fillSessionInfo();
 144             $userIsLoggedIn = true;
 145         }
 146         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 147         if (empty($_SESSION['uid']) ||
 148             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 149             time() >= $_SESSION['expires_on'])
 150         {
 151             logout();
 152             $userIsLoggedIn = false;
 153             $loginFailure = true;
 154         }
 155         if (!empty($_SESSION['longlastingsession'])) {
 156             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 157         }
 158         else {
 159             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 160         }
 161         if (!$loginFailure) {
 162             $userIsLoggedIn = true;
 163         }
 164
 165         return $userIsLoggedIn;
 166 }
 167 //==================================================================================================
 168 $userIsLoggedIn = setup_login_state();
 169 //==================================================================================================
 170 //==================================================================================================
 171
 172 // Check PHP version
 173 function checkphpversion()
 174 {
 175     if (version_compare(PHP_VERSION, '5.1.0') < 0)
 176     {
 177         header('Content-Type: text/plain; charset=utf-8');
 178         echo 'Your PHP version is obsolete! Shaarli requires at least php 5.1.0, and thus cannot run. Sorry. Your PHP version has known security vulnerabilities and should be updated as soon as possible.';
 179         exit;
 180     }
 181 }
 182
 183 // Checks if an update is available for Shaarli.
 184 // (at most once a day, and only for registered user.)
 185 // Output: '' = no new version.
 186 //         other= the available version.
 187 function checkUpdate()
 188 {
 189     if (!isLoggedIn()) return ''; // Do not check versions for visitors.
 190     if (empty($GLOBALS['config']['ENABLE_UPDATECHECK'])) return ''; // Do not check if the user doesn't want to.
 191
 192     // Get latest version number at most once a day.
 193     if (!is_file($GLOBALS['config']['UPDATECHECK_FILENAME']) || (filemtime($GLOBALS['config']['UPDATECHECK_FILENAME'])<time()-($GLOBALS['config']['UPDATECHECK_INTERVAL'])))
 194     {
 195         $version=shaarli_version;
 196         list($httpstatus,$headers,$data) = getHTTP('https://raw.githubusercontent.com/shaarli/Shaarli/master/shaarli_version.php',2);
 197         if (strpos($httpstatus,'200 OK')!==false) $version=str_replace(' */ ?>','',str_replace('<?php /* ','',$data));
 198         // If failed, never mind. We don't want to bother the user with that.
 199         file_put_contents($GLOBALS['config']['UPDATECHECK_FILENAME'],$version); // touch file date
 200     }
 201     // Compare versions:
 202     $newestversion=file_get_contents($GLOBALS['config']['UPDATECHECK_FILENAME']);
 203     if (version_compare($newestversion,shaarli_version)==1) return $newestversion;
 204     return '';
 205 }
 206
 207
 208 // -----------------------------------------------------------------------------------------------
 209 // Simple cache system (mainly for the RSS/ATOM feeds).
 210
 211 class pageCache
 212 {
 213     private $url; // Full URL of the page to cache (typically the value returned by pageUrl())
 214     private $shouldBeCached; // boolean: Should this url be cached?
 215     private $filename; // Name of the cache file for this url.
 216
 217     /*
 218          $url = URL (typically the value returned by pageUrl())
 219          $shouldBeCached = boolean. If false, the cache will be disabled.
 220     */
 221     public function __construct($url,$shouldBeCached)
 222     {
 223         $this->url = $url;
 224         $this->filename = $GLOBALS['config']['PAGECACHE'].'/'.sha1($url).'.cache';
 225         $this->shouldBeCached = $shouldBeCached;
 226     }
 227
 228     // If the page should be cached and a cached version exists,
 229     // returns the cached version (otherwise, return null).
 230     public function cachedVersion()
 231     {
 232         if (!$this->shouldBeCached) return null;
 233         if (is_file($this->filename)) { return file_get_contents($this->filename); exit; }
 234         return null;
 235     }
 236
 237     // Put a page in the cache.
 238     public function cache($page)
 239     {
 240         if (!$this->shouldBeCached) return;
 241         file_put_contents($this->filename,$page);
 242     }
 243
 244     // Purge the whole cache.
 245     // (call with pageCache::purgeCache())
 246     public static function purgeCache()
 247     {
 248         if (is_dir($GLOBALS['config']['PAGECACHE']))
 249         {
 250             $handler = opendir($GLOBALS['config']['PAGECACHE']);
 251             if ($handler!==false)
 252             {
 253                 while (($filename = readdir($handler))!==false)
 254                 {
 255                     if (endsWith($filename,'.cache')) { unlink($GLOBALS['config']['PAGECACHE'].'/'.$filename); }
 256                 }
 257                 closedir($handler);
 258             }
 259         }
 260     }
 261
 262 }
 263
 264
 265 // -----------------------------------------------------------------------------------------------
 266 // Log to text file
 267 function logm($message)
 268 {
 269     $t = strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n";
 270     file_put_contents($GLOBALS['config']['DATADIR'].'/log.txt',$t,FILE_APPEND);
 271 }
 272
 273 // In a string, converts URLs to clickable links.
 274 // Function inspired from http://www.php.net/manual/en/function.preg-replace.php#85722
 275 function text2clickable($url)
 276 {
 277     $redir = empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'];
 278     return preg_replace('!(((?:https?|ftp|file)://|apt:|magnet:)\S+[[:alnum:]]/?)!si','<a href="'.$redir.'$1" rel="nofollow">$1</a>',$url);
 279 }
 280
 281 // This function inserts &nbsp; where relevant so that multiple spaces are properly displayed in HTML
 282 // even in the absence of <pre>  (This is used in description to keep text formatting)
 283 function keepMultipleSpaces($text)
 284 {
 285     return str_replace('  ',' &nbsp;',$text);
 286
 287 }
 288 // ------------------------------------------------------------------------------------------
 289 // Sniff browser language to display dates in the right format automatically.
 290 // (Note that is may not work on your server if the corresponding local is not installed.)
 291 function autoLocale()
 292 {
 293     $attempts = array('en_US'); // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 294     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 295     {   // (It's a bit crude, but it works very well. Preferred language is always presented first.)
 296         if (preg_match('/([a-z]{2})-?([a-z]{2})?/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) {
 297             $loc = $matches[1] . (!empty($matches[2]) ? '_' . strtoupper($matches[2]) : '');
 298             $attempts = array($loc.'.UTF-8', $loc, str_replace('_', '-', $loc).'.UTF-8', str_replace('_', '-', $loc),
 299                 $loc . '_' . strtoupper($loc).'.UTF-8', $loc . '_' . strtoupper($loc),
 300                 $loc . '_' . $loc.'.UTF-8', $loc . '_' . $loc, $loc . '-' . strtoupper($loc).'.UTF-8',
 301                 $loc . '-' . strtoupper($loc), $loc . '-' . $loc.'.UTF-8', $loc . '-' . $loc);
 302         }
 303     }
 304     setlocale(LC_TIME, $attempts);  // LC_TIME = Set local for date/time format only.
 305 }
 306
 307 // ------------------------------------------------------------------------------------------
 308 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 309 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 310 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 311 function pubsubhub()
 312 {
 313     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 314     {
 315        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 316        $topic_url = array (
 317                        indexUrl().'?do=atom',
 318                        indexUrl().'?do=rss'
 319                     );
 320        $p->publish_update($topic_url);
 321     }
 322 }
 323
 324 // ------------------------------------------------------------------------------------------
 325 // Session management
 326
 327 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 328 function allIPs()
 329 {
 330     $ip = $_SERVER["REMOTE_ADDR"];
 331     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 332     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 333     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 334     return $ip;
 335 }
 336
 337 function fillSessionInfo() {
 338         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 339         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 340         $_SESSION['username']=$GLOBALS['login'];
 341         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 342 }
 343
 344 // Check that user/password is correct.
 345 function check_auth($login,$password)
 346 {
 347     $hash = sha1($password.$login.$GLOBALS['salt']);
 348     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 349     {   // Login/password is correct.
 350                 fillSessionInfo();
 351         logm('Login successful');
 352         return True;
 353     }
 354     logm('Login failed for user '.$login);
 355     return False;
 356 }
 357
 358 // Returns true if the user is logged in.
 359 function isLoggedIn()
 360 {
 361     global $userIsLoggedIn;
 362     return $userIsLoggedIn;
 363 }
 364
 365 // Force logout.
 366 function logout() {
 367     if (isset($_SESSION)) {
 368         unset($_SESSION['uid']);
 369         unset($_SESSION['ip']);
 370         unset($_SESSION['username']);
 371         unset($_SESSION['privateonly']);
 372     }
 373     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 374 }
 375
 376
 377 // ------------------------------------------------------------------------------------------
 378 // Brute force protection system
 379 // Several consecutive failed logins will ban the IP address for 30 minutes.
 380 if (!is_file($GLOBALS['config']['IPBANS_FILENAME'])) file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export(array('FAILURES'=>array(),'BANS'=>array()),true).";\n?>");
 381 include $GLOBALS['config']['IPBANS_FILENAME'];
 382 // Signal a failed login. Will ban the IP if too many failures:
 383 function ban_loginFailed()
 384 {
 385     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 386     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 387     $gb['FAILURES'][$ip]++;
 388     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 389     {
 390         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 391         logm('IP address banned from login');
 392     }
 393     $GLOBALS['IPBANS'] = $gb;
 394     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 395 }
 396
 397 // Signals a successful login. Resets failed login counter.
 398 function ban_loginOk()
 399 {
 400     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 401     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 402     $GLOBALS['IPBANS'] = $gb;
 403     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 404 }
 405
 406 // Checks if the user CAN login. If 'true', the user can try to login.
 407 function ban_canLogin()
 408 {
 409     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 410     if (isset($gb['BANS'][$ip]))
 411     {
 412         // User is banned. Check if the ban has expired:
 413         if ($gb['BANS'][$ip]<=time())
 414         {   // Ban expired, user can try to login again.
 415             logm('Ban lifted.');
 416             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 417             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 418             return true; // Ban has expired, user can login.
 419         }
 420         return false; // User is banned.
 421     }
 422     return true; // User is not banned.
 423 }
 424
 425 // ------------------------------------------------------------------------------------------
 426 // Process login form: Check if login/password is correct.
 427 if (isset($_POST['login']))
 428 {
 429     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 430     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 431     {   // Login/password is OK.
 432         ban_loginOk();
 433         // If user wants to keep the session cookie even after the browser closes:
 434         if (!empty($_POST['longlastingsession']))
 435         {
 436                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 437             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 438             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 439
 440             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 441             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 442             // Note: Never forget the trailing slash on the cookie path!
 443             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 444         }
 445         else // Standard session expiration (=when browser closes)
 446         {
 447             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 448             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 449             session_regenerate_id(true);
 450         }
 451         // Optional redirect after login:
 452         if (isset($_GET['post'])) { header('Location: ?post='.urlencode($_GET['post']).(!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').(!empty($_GET['description'])?'&description='.urlencode($_GET['description']):'').(!empty($_GET['source'])?'&source='.urlencode($_GET['source']):'')); exit; }
 453         if (isset($_POST['returnurl']))
 454         {
 455             if (endsWith($_POST['returnurl'],'?do=login')) { header('Location: ?'); exit; } // Prevent loops over login screen.
 456             header('Location: '.$_POST['returnurl']); exit;
 457         }
 458         header('Location: ?'); exit;
 459     }
 460     else
 461     {
 462         ban_loginFailed();
 463         $redir = '';
 464         if (isset($_GET['post'])) { $redir = '&post='.urlencode($_GET['post']).(!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').(!empty($_GET['description'])?'&description='.urlencode($_GET['description']):'').(!empty($_GET['source'])?'&source='.urlencode($_GET['source']):''); }
 465         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 466         exit;
 467     }
 468 }
 469
 470 // ------------------------------------------------------------------------------------------
 471 // Misc utility functions:
 472
 473 // Returns the server URL (including port and http/https), without path.
 474 // e.g. "http://myserver.com:8080"
 475 // You can append $_SERVER['SCRIPT_NAME'] to get the current script URL.
 476 function serverUrl()
 477 {
 478     $https = (!empty($_SERVER['HTTPS']) && (strtolower($_SERVER['HTTPS'])=='on')) || $_SERVER["SERVER_PORT"]=='443'; // HTTPS detection.
 479     $serverport = ($_SERVER["SERVER_PORT"]=='80' || ($https && $_SERVER["SERVER_PORT"]=='443') ? '' : ':'.$_SERVER["SERVER_PORT"]);
 480     return 'http'.($https?'s':'').'://'.$_SERVER['SERVER_NAME'].$serverport;
 481 }
 482
 483 // Returns the absolute URL of current script, without the query.
 484 // (e.g. http://sebsauvage.net/links/)
 485 function indexUrl()
 486 {
 487     $scriptname = $_SERVER["SCRIPT_NAME"];
 488     // If the script is named 'index.php', we remove it (for better looking URLs,
 489     // e.g. http://mysite.com/shaarli/?abcde instead of http://mysite.com/shaarli/index.php?abcde)
 490     if (endswith($scriptname,'index.php')) $scriptname = substr($scriptname,0,strlen($scriptname)-9);
 491     return serverUrl() . $scriptname;
 492 }
 493
 494 // Returns the absolute URL of current script, WITH the query.
 495 // (e.g. http://sebsauvage.net/links/?toto=titi&spamspamspam=humbug)
 496 function pageUrl()
 497 {
 498     return indexUrl().(!empty($_SERVER["QUERY_STRING"]) ? '?'.$_SERVER["QUERY_STRING"] : '');
 499 }
 500
 501 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 502 function return_bytes($val)
 503 {
 504     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 505     switch($last)
 506     {
 507         case 'g': $val *= 1024;
 508         case 'm': $val *= 1024;
 509         case 'k': $val *= 1024;
 510     }
 511     return $val;
 512 }
 513
 514 // Try to determine max file size for uploads (POST).
 515 // Returns an integer (in bytes)
 516 function getMaxFileSize()
 517 {
 518     $size1 = return_bytes(ini_get('post_max_size'));
 519     $size2 = return_bytes(ini_get('upload_max_filesize'));
 520     // Return the smaller of two:
 521     $maxsize = min($size1,$size2);
 522     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 523     return $maxsize;
 524 }
 525
 526 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 527     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 528     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 529 function linkdate2timestamp($linkdate)
 530 {
 531     if(strcmp($linkdate, '_000000') !== 0 || !$linkdate){
 532         $Y=$M=$D=$h=$m=$s=0;
 533         $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 534         return mktime($h,$m,$s,$M,$D,$Y);
 535     }
 536     return time();
 537 }
 538
 539 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 540     (used to build the pubDate attribute in RSS feed.)  */
 541 function linkdate2rfc822($linkdate)
 542 {
 543     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 544 }
 545
 546 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 547     (used to build the updated tags in ATOM feed.)  */
 548 function linkdate2iso8601($linkdate)
 549 {
 550     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 551 }
 552
 553 // Parse HTTP response headers and return an associative array.
 554 function http_parse_headers_shaarli( $headers )
 555 {
 556     $res=array();
 557     foreach($headers as $header)
 558     {
 559         $i = strpos($header,': ');
 560         if ($i!==false)
 561         {
 562             $key=substr($header,0,$i);
 563             $value=substr($header,$i+2,strlen($header)-$i-2);
 564             $res[$key]=$value;
 565         }
 566     }
 567     return $res;
 568 }
 569
 570 /* GET an URL.
 571    Input: $url : URL to get (http://...)
 572           $timeout : Network timeout (will wait this many seconds for an anwser before giving up).
 573    Output: An array.  [0] = HTTP status message (e.g. "HTTP/1.1 200 OK") or error message
 574                       [1] = associative array containing HTTP response headers (e.g. echo getHTTP($url)[1]['Content-Type'])
 575                       [2] = data
 576     Example: list($httpstatus,$headers,$data) = getHTTP('http://sebauvage.net/');
 577              if (strpos($httpstatus,'200 OK')!==false)
 578                  echo 'Data type: '.htmlspecialchars($headers['Content-Type']);
 579              else
 580                  echo 'There was an error: '.htmlspecialchars($httpstatus)
 581 */
 582 function getHTTP($url,$timeout=30)
 583 {
 584     try
 585     {
 586         $options = array('http'=>array('method'=>'GET','timeout' => $timeout, 'user_agent' => 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:23.0) Gecko/20100101 Firefox/23.0')); // Force network timeout
 587         $context = stream_context_create($options);
 588         $data=file_get_contents($url,false,$context,-1, 4000000); // We download at most 4 Mb from source.
 589         if (!$data) { return array('HTTP Error',array(),''); }
 590         $httpStatus=$http_response_header[0]; // e.g. "HTTP/1.1 200 OK"
 591         $responseHeaders=http_parse_headers_shaarli($http_response_header);
 592         return array($httpStatus,$responseHeaders,$data);
 593     }
 594     catch (Exception $e)  // getHTTP *can* fail silently (we don't care if the title cannot be fetched)
 595     {
 596         return array($e->getMessage(),'','');
 597     }
 598 }
 599
 600 // Extract title from an HTML document.
 601 // (Returns an empty string if not found.)
 602 function html_extract_title($html)
 603 {
 604   return preg_match('!<title>(.*?)</title>!is', $html, $matches) ? trim(str_replace("\n",' ', $matches[1])) : '' ;
 605 }
 606
 607 // ------------------------------------------------------------------------------------------
 608 // Token management for XSRF protection
 609 // Token should be used in any form which acts on data (create,update,delete,import...).
 610 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 611
 612 // Returns a token.
 613 function getToken()
 614 {
 615     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 616     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 617     return $rnd;
 618 }
 619
 620 // Tells if a token is OK. Using this function will destroy the token.
 621 // true=token is OK.
 622 function tokenOk($token)
 623 {
 624     if (isset($_SESSION['tokens'][$token]))
 625     {
 626         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 627         return true; // Token is OK.
 628     }
 629     return false; // Wrong token, or already used.
 630 }
 631
 632 // ------------------------------------------------------------------------------------------
 633 /* This class is in charge of building the final page.
 634    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 635    p = new pageBuilder;
 636    p.assign('myfield','myvalue');
 637    p.renderPage('mytemplate');
 638
 639 */
 640 class pageBuilder
 641 {
 642     private $tpl; // RainTPL template
 643
 644     function __construct()
 645     {
 646         $this->tpl=false;
 647     }
 648
 649     private function initialize()
 650     {
 651         $this->tpl = new RainTPL;
 652         $this->tpl->assign('newversion',escape(checkUpdate()));
 653         $this->tpl->assign('feedurl',escape(indexUrl()));
 654         $searchcrits=''; // Search criteria
 655         if (!empty($_GET['searchtags'])) $searchcrits.='&searchtags='.urlencode($_GET['searchtags']);
 656         elseif (!empty($_GET['searchterm'])) $searchcrits.='&searchterm='.urlencode($_GET['searchterm']);
 657         $this->tpl->assign('searchcrits',$searchcrits);
 658         $this->tpl->assign('source',indexUrl());
 659         $this->tpl->assign('version',shaarli_version);
 660         $this->tpl->assign('scripturl',indexUrl());
 661         $this->tpl->assign('pagetitle','Shaarli');
 662         $this->tpl->assign('privateonly',!empty($_SESSION['privateonly'])); // Show only private links?
 663         if (!empty($GLOBALS['title'])) $this->tpl->assign('pagetitle',$GLOBALS['title']);
 664         if (!empty($GLOBALS['titleLink'])) $this->tpl->assign('titleLink',$GLOBALS['titleLink']);
 665         if (!empty($GLOBALS['pagetitle'])) $this->tpl->assign('pagetitle',$GLOBALS['pagetitle']);
 666         $this->tpl->assign('shaarlititle',empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title'] );
 667         return;
 668     }
 669
 670     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 671     public function assign($what,$where)
 672     {
 673         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 674         $this->tpl->assign($what,$where);
 675     }
 676
 677     // Render a specific page (using a template).
 678     // e.g. pb.renderPage('picwall')
 679     public function renderPage($page)
 680     {
 681         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 682         $this->tpl->draw($page);
 683     }
 684 }
 685
 686 // ------------------------------------------------------------------------------------------
 687 // Output the last N links in RSS 2.0 format.
 688 function showRSS()
 689 {
 690     header('Content-Type: application/rss+xml; charset=utf-8');
 691
 692     // $usepermalink : If true, use permalink instead of final link.
 693     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=rss&permalinks
 694     // Also enabled through a config option
 695     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 696
 697     // Cache system
 698     $query = $_SERVER["QUERY_STRING"];
 699     $cache = new pageCache(pageUrl(),startsWith($query,'do=rss') && !isLoggedIn());
 700     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
 701
 702     // If cached was not found (or not usable), then read the database and build the response:
 703     $LINKSDB = new LinkDB(
 704         $GLOBALS['config']['DATASTORE'],
 705         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 706         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 707     );
 708     // Read links from database (and filter private links if user it not logged in).
 709
 710     // Optionally filter the results:
 711     $linksToDisplay=array();
 712     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 713     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 714     else $linksToDisplay = $LINKSDB;
 715
 716     $nblinksToDisplay = 50;  // Number of links to display.
 717     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 718     {
 719         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 720     }
 721
 722     $pageaddr=escape(indexUrl());
 723     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 724     echo '<channel><title>'.$GLOBALS['title'].'</title><link>'.$pageaddr.'</link>';
 725     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 726     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 727     {
 728         echo '<!-- PubSubHubbub Discovery -->';
 729         echo '<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 730         echo '<link rel="self" href="'.$pageaddr.'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 731         echo '<!-- End Of PubSubHubbub Discovery -->';
 732     }
 733     $i=0;
 734     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 735     while ($i<$nblinksToDisplay && $i<count($keys))
 736     {
 737         $link = $linksToDisplay[$keys[$i]];
 738         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 739         $rfc822date = linkdate2rfc822($link['linkdate']);
 740         $absurl = $link['url'];
 741         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 742         if ($usepermalinks===true)
 743             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 744         else
 745             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 746         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.escape($rfc822date)."</pubDate>\n";
 747         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 748         {
 749             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.$pageaddr.'">'.$tag.'</category>'."\n"; }
 750         }
 751
 752         // Add permalink in description
 753         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 754         // If user wants permalinks first, put the final link in description
 755         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 756         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 757         echo '<description><![CDATA['.nl2br(keepMultipleSpaces(text2clickable($link['description']))).$descriptionlink.']]></description>'."\n</item>\n";
 758         $i++;
 759     }
 760     echo '</channel></rss><!-- Cached version of '.escape(pageUrl()).' -->';
 761
 762     $cache->cache(ob_get_contents());
 763     ob_end_flush();
 764     exit;
 765 }
 766
 767 // ------------------------------------------------------------------------------------------
 768 // Output the last N links in ATOM format.
 769 function showATOM()
 770 {
 771     header('Content-Type: application/atom+xml; charset=utf-8');
 772
 773     // $usepermalink : If true, use permalink instead of final link.
 774     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
 775     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 776
 777     // Cache system
 778     $query = $_SERVER["QUERY_STRING"];
 779     $cache = new pageCache(pageUrl(),startsWith($query,'do=atom') && !isLoggedIn());
 780     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
 781     // If cached was not found (or not usable), then read the database and build the response:
 782
 783 // Read links from database (and filter private links if used it not logged in).
 784     $LINKSDB = new LinkDB(
 785         $GLOBALS['config']['DATASTORE'],
 786         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 787         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 788     );
 789
 790     // Optionally filter the results:
 791     $linksToDisplay=array();
 792     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 793     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 794     else $linksToDisplay = $LINKSDB;
 795
 796     $nblinksToDisplay = 50;  // Number of links to display.
 797     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 798     {
 799         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 800     }
 801
 802     $pageaddr=escape(indexUrl());
 803     $latestDate = '';
 804     $entries='';
 805     $i=0;
 806     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 807     while ($i<$nblinksToDisplay && $i<count($keys))
 808     {
 809         $link = $linksToDisplay[$keys[$i]];
 810         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 811         $iso8601date = linkdate2iso8601($link['linkdate']);
 812         $latestDate = max($latestDate,$iso8601date);
 813         $absurl = $link['url'];
 814         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 815         $entries.='<entry><title>'.$link['title'].'</title>';
 816         if ($usepermalinks===true)
 817             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
 818         else
 819             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
 820         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.escape($iso8601date).'</updated>';
 821
 822         // Add permalink in description
 823         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 824         // If user wants permalinks first, put the final link in description
 825         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 826         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 827
 828         $entries.='<content type="html"><![CDATA['.nl2br(keepMultipleSpaces(text2clickable($link['description']))).$descriptionlink."]]></content>\n";
 829         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
 830         {
 831             foreach(explode(' ',$link['tags']) as $tag)
 832                 { $entries.='<category scheme="'.$pageaddr.'" term="'.$tag.'" />'."\n"; }
 833         }
 834         $entries.="</entry>\n";
 835         $i++;
 836     }
 837     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
 838     $feed.='<title>'.$GLOBALS['title'].'</title>';
 839     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.escape($latestDate).'</updated>';
 840     $feed.='<link rel="self" href="'.escape(serverUrl().$_SERVER["REQUEST_URI"]).'" />';
 841     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 842     {
 843         $feed.='<!-- PubSubHubbub Discovery -->';
 844         $feed.='<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
 845         $feed.='<!-- End Of PubSubHubbub Discovery -->';
 846     }
 847     $feed.='<author><name>'.$pageaddr.'</name><uri>'.$pageaddr.'</uri></author>';
 848     $feed.='<id>'.$pageaddr.'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
 849     $feed.=$entries;
 850     $feed.='</feed><!-- Cached version of '.escape(pageUrl()).' -->';
 851     echo $feed;
 852
 853     $cache->cache(ob_get_contents());
 854     ob_end_flush();
 855     exit;
 856 }
 857
 858 // ------------------------------------------------------------------------------------------
 859 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 860 // Gives the last 7 days (which have links).
 861 // This RSS feed cannot be filtered.
 862 function showDailyRSS()
 863 {
 864     // Cache system
 865     $query = $_SERVER["QUERY_STRING"];
 866     $cache = new pageCache(pageUrl(),startsWith($query,'do=dailyrss') && !isLoggedIn());
 867     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
 868     // If cached was not found (or not usable), then read the database and build the response:
 869
 870 // Read links from database (and filter private links if used it not logged in).
 871     $LINKSDB = new LinkDB(
 872         $GLOBALS['config']['DATASTORE'],
 873         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 874         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 875     );
 876
 877     /* Some Shaarlies may have very few links, so we need to look
 878        back in time (rsort()) until we have enough days ($nb_of_days).
 879     */
 880     $linkdates=array(); foreach($LINKSDB as $linkdate=>$value) { $linkdates[]=$linkdate; }
 881     rsort($linkdates);
 882     $nb_of_days=7; // We take 7 days.
 883     $today=Date('Ymd');
 884     $days=array();
 885     foreach($linkdates as $linkdate)
 886     {
 887         $day=substr($linkdate,0,8); // Extract day (without time)
 888         if (strcmp($day,$today)<0)
 889         {
 890             if (empty($days[$day])) $days[$day]=array();
 891             $days[$day][]=$linkdate;
 892         }
 893         if (count($days)>$nb_of_days) break; // Have we collected enough days?
 894     }
 895
 896     // Build the RSS feed.
 897     header('Content-Type: application/rss+xml; charset=utf-8');
 898     $pageaddr=escape(indexUrl());
 899     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 900     echo '<channel><title>Daily - '.$GLOBALS['title'].'</title><link>'.$pageaddr.'</link>';
 901     echo '<description>Daily shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n";
 902
 903     foreach($days as $day=>$linkdates) // For each day.
 904     {
 905         $daydate = utf8_encode(strftime('%A %d, %B %Y',linkdate2timestamp($day.'_000000'))); // Full text date
 906         $rfc822date = linkdate2rfc822($day.'_000000');
 907         $absurl=escape(indexUrl().'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 908         echo '<item><title>'.$GLOBALS['title'].' - '.$daydate.'</title><guid>'.$absurl.'</guid><link>'.$absurl.'</link>';
 909         echo '<pubDate>'.escape($rfc822date)."</pubDate>";
 910
 911         // Build the HTML body of this RSS entry.
 912         $html='';
 913         $href='';
 914         $links=array();
 915         // We pre-format some fields for proper output.
 916         foreach($linkdates as $linkdate)
 917         {
 918             $l = $LINKSDB[$linkdate];
 919             $l['formatedDescription']=nl2br(keepMultipleSpaces(text2clickable($l['description'])));
 920             $l['thumbnail'] = thumbnail($l['url']);
 921             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
 922             if (startsWith($l['url'],'?')) $l['url']=indexUrl().$l['url'];  // make permalink URL absolute
 923             $links[$linkdate]=$l;
 924         }
 925         // Then build the HTML for this day:
 926         $tpl = new RainTPL;
 927         $tpl->assign('links',$links);
 928         $html = $tpl->draw('dailyrss',$return_string=true);
 929         echo "\n";
 930         echo '<description><![CDATA['.$html.']]></description>'."\n</item>\n\n";
 931
 932     }
 933     echo '</channel></rss><!-- Cached version of '.escape(pageUrl()).' -->';
 934
 935     $cache->cache(ob_get_contents());
 936     ob_end_flush();
 937     exit;
 938 }
 939
 940 // "Daily" page.
 941 function showDaily()
 942 {
 943     $LINKSDB = new LinkDB(
 944         $GLOBALS['config']['DATASTORE'],
 945         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 946         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 947     );
 948
 949     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 950     if (isset($_GET['day'])) $day=$_GET['day'];
 951
 952     $days = $LINKSDB->days();
 953     $i = array_search($day,$days);
 954     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
 955     $previousday='';
 956     $nextday='';
 957     if ($i!==false)
 958     {
 959         if ($i>=1) $previousday=$days[$i-1];
 960         if ($i<count($days)-1) $nextday=$days[$i+1];
 961     }
 962
 963     try {
 964         $linksToDisplay = $LINKSDB->filterDay($day);
 965     } catch (Exception $exc) {
 966         error_log($exc);
 967         $linksToDisplay = [];
 968     }
 969
 970     // We pre-format some fields for proper output.
 971     foreach($linksToDisplay as $key=>$link)
 972     {
 973
 974         $taglist = explode(' ',$link['tags']);
 975         uasort($taglist, 'strcasecmp');
 976         $linksToDisplay[$key]['taglist']=$taglist;
 977         $linksToDisplay[$key]['formatedDescription']=nl2br(keepMultipleSpaces(text2clickable($link['description'])));
 978         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
 979         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
 980     }
 981
 982     /* We need to spread the articles on 3 columns.
 983        I did not want to use a JavaScript lib like http://masonry.desandro.com/
 984        so I manually spread entries with a simple method: I roughly evaluate the
 985        height of a div according to title and description length.
 986     */
 987     $columns=array(array(),array(),array()); // Entries to display, for each column.
 988     $fill=array(0,0,0);  // Rough estimate of columns fill.
 989     foreach($linksToDisplay as $key=>$link)
 990     {
 991         // Roughly estimate length of entry (by counting characters)
 992         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
 993         // Description: 836 characters gives roughly 342 pixel height.
 994         // This is not perfect, but it's usually OK.
 995         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
 996         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
 997         // Then put in column which is the less filled:
 998         $smallest=min($fill); // find smallest value in array.
 999         $index=array_search($smallest,$fill); // find index of this smallest value.
1000         array_push($columns[$index],$link); // Put entry in this column.
1001         $fill[$index]+=$length;
1002     }
1003     $PAGE = new pageBuilder;
1004     $PAGE->assign('linksToDisplay',$linksToDisplay);
1005     $PAGE->assign('linkcount',count($LINKSDB));
1006     $PAGE->assign('cols', $columns);
1007     $PAGE->assign('day',linkdate2timestamp($day.'_000000'));
1008     $PAGE->assign('previousday',$previousday);
1009     $PAGE->assign('nextday',$nextday);
1010     $PAGE->renderPage('daily');
1011     exit;
1012 }
1013
1014
1015 // ------------------------------------------------------------------------------------------
1016 // Render HTML page (according to URL parameters and user rights)
1017 function renderPage()
1018 {
1019     $LINKSDB = new LinkDB(
1020         $GLOBALS['config']['DATASTORE'],
1021         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
1022         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
1023     );
1024
1025     // -------- Display login form.
1026     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=login'))
1027     {
1028         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1029         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1030         $PAGE = new pageBuilder;
1031         $PAGE->assign('token',$token);
1032         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
1033         $PAGE->renderPage('loginform');
1034         exit;
1035     }
1036     // -------- User wants to logout.
1037     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1038     {
1039         invalidateCaches();
1040         logout();
1041         header('Location: ?');
1042         exit;
1043     }
1044
1045     // -------- Picture wall
1046     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=picwall'))
1047     {
1048         // Optionally filter the results:
1049         $links=array();
1050         if (!empty($_GET['searchterm'])) $links = $LINKSDB->filterFulltext($_GET['searchterm']);
1051         elseif (!empty($_GET['searchtags']))   $links = $LINKSDB->filterTags(trim($_GET['searchtags']));
1052         else $links = $LINKSDB;
1053
1054         $body='';
1055         $linksToDisplay=array();
1056
1057         // Get only links which have a thumbnail.
1058         foreach($links as $link)
1059         {
1060             $permalink='?'.escape(smallhash($link['linkdate']));
1061             $thumb=lazyThumbnail($link['url'],$permalink);
1062             if ($thumb!='') // Only output links which have a thumbnail.
1063             {
1064                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1065                 $linksToDisplay[]=$link; // Add to array.
1066             }
1067         }
1068
1069         $PAGE = new pageBuilder;
1070         $PAGE->assign('linkcount',count($LINKSDB));
1071         $PAGE->assign('linksToDisplay',$linksToDisplay);
1072         $PAGE->renderPage('picwall');
1073         exit;
1074     }
1075
1076     // -------- Tag cloud
1077     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tagcloud'))
1078     {
1079         $tags= $LINKSDB->allTags();
1080
1081         // We sort tags alphabetically, then choose a font size according to count.
1082         // First, find max value.
1083         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1084         ksort($tags);
1085         $tagList=array();
1086         foreach($tags as $key=>$value)
1087         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1088         {
1089             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1090         }
1091         $PAGE = new pageBuilder;
1092         $PAGE->assign('linkcount',count($LINKSDB));
1093         $PAGE->assign('tags',$tagList);
1094         $PAGE->renderPage('tagcloud');
1095         exit;
1096     }
1097
1098     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1099     if (isset($_GET['addtag']))
1100     {
1101         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1102         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1103         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1104
1105         // Check if this tag is already in the search query and ignore it if it is.
1106         // Each tag is always separated by a space
1107         $current_tags = explode(' ', $params['searchtags']);
1108         $addtag = true;
1109         foreach ($current_tags as $value) {
1110             if ($value === $_GET['addtag']) {
1111                 $addtag = false;
1112                 break;
1113             }
1114         }
1115         // Append the tag if necessary
1116         if (empty($params['searchtags'])) {
1117             $params['searchtags'] = trim($_GET['addtag']);
1118         }
1119         else if ($addtag) {
1120             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1121         }
1122
1123         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1124         header('Location: ?'.http_build_query($params));
1125         exit;
1126     }
1127
1128     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1129     if (isset($_GET['removetag']))
1130     {
1131         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1132         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?'); exit; } // In case browser does not send HTTP_REFERER
1133         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1134         if (isset($params['searchtags']))
1135         {
1136             $tags = explode(' ',$params['searchtags']);
1137             $tags=array_diff($tags, array($_GET['removetag'])); // Remove value from array $tags.
1138             if (count($tags)==0) unset($params['searchtags']); else $params['searchtags'] = implode(' ',$tags);
1139             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1140         }
1141         header('Location: ?'.http_build_query($params));
1142         exit;
1143     }
1144
1145     // -------- User wants to change the number of links per page (linksperpage=...)
1146     if (isset($_GET['linksperpage']))
1147     {
1148         if (is_numeric($_GET['linksperpage'])) { $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage'])); }
1149         // Make sure the referrer is Shaarli itself.
1150         $referer = '?';
1151         if (!empty($_SERVER['HTTP_REFERER']) && strcmp(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST),$_SERVER['HTTP_HOST'])==0)
1152             $referer = $_SERVER['HTTP_REFERER'];
1153         header('Location: '.$referer);
1154         exit;
1155     }
1156
1157     // -------- User wants to see only private links (toggle)
1158     if (isset($_GET['privateonly']))
1159     {
1160         if (empty($_SESSION['privateonly']))
1161         {
1162             $_SESSION['privateonly']=1; // See only private links
1163         }
1164         else
1165         {
1166             unset($_SESSION['privateonly']); // See all links
1167         }
1168         // Make sure the referrer is Shaarli itself.
1169         $referer = '?';
1170         if (!empty($_SERVER['HTTP_REFERER']) && strcmp(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST),$_SERVER['HTTP_HOST'])==0)
1171             $referer = $_SERVER['HTTP_REFERER'];
1172         header('Location: '.$referer);
1173         exit;
1174     }
1175
1176     // -------- Handle other actions allowed for non-logged in users:
1177     if (!isLoggedIn())
1178     {
1179         // User tries to post new link but is not logged in:
1180         // Show login screen, then redirect to ?post=...
1181         if (isset($_GET['post']))
1182         {
1183             header('Location: ?do=login&post='.urlencode($_GET['post']).(!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').(!empty($_GET['description'])?'&description='.urlencode($_GET['description']):'').(!empty($_GET['source'])?'&source='.urlencode($_GET['source']):'')); // Redirect to login page, then back to post link.
1184             exit;
1185         }
1186
1187                 // Same case as above except that user tried to access ?do=addlink without being logged in
1188                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1189                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1190                         header('Location: ?do=login&post=');
1191                         exit;
1192                 }
1193
1194         $PAGE = new pageBuilder;
1195         buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1196         $PAGE->renderPage('linklist');
1197         exit; // Never remove this one! All operations below are reserved for logged in user.
1198     }
1199
1200     // -------- All other functions are reserved for the registered user:
1201
1202     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1203     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tools'))
1204     {
1205         $PAGE = new pageBuilder;
1206         $PAGE->assign('linkcount',count($LINKSDB));
1207         $PAGE->assign('pageabsaddr',indexUrl());
1208         $PAGE->renderPage('tools');
1209         exit;
1210     }
1211
1212     // -------- User wants to change his/her password.
1213     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changepasswd'))
1214     {
1215         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1216         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1217         {
1218             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1219
1220             // Make sure old password is correct.
1221             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1222             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1223             // Save new password
1224             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1225             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1226             try {
1227                 writeConfig($GLOBALS, isLoggedIn());
1228             }
1229             catch(Exception $e) {
1230                 error_log(
1231                     'ERROR while writing config file after changing password.' . PHP_EOL .
1232                     $e->getMessage()
1233                 );
1234
1235                 // TODO: do not handle exceptions/errors in JS.
1236                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1237                 exit;
1238             }
1239             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1240             exit;
1241         }
1242         else // show the change password form.
1243         {
1244             $PAGE = new pageBuilder;
1245             $PAGE->assign('linkcount',count($LINKSDB));
1246             $PAGE->assign('token',getToken());
1247             $PAGE->renderPage('changepassword');
1248             exit;
1249         }
1250     }
1251
1252     // -------- User wants to change configuration
1253     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=configure'))
1254     {
1255         if (!empty($_POST['title']) )
1256         {
1257             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1258             $tz = 'UTC';
1259             if (!empty($_POST['continent']) && !empty($_POST['city']))
1260                 if (isTZvalid($_POST['continent'],$_POST['city']))
1261                     $tz = $_POST['continent'].'/'.$_POST['city'];
1262             $GLOBALS['timezone'] = $tz;
1263             $GLOBALS['title']=$_POST['title'];
1264             $GLOBALS['titleLink']=$_POST['titleLink'];
1265             $GLOBALS['redirector']=$_POST['redirector'];
1266             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1267             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1268             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1269             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1270             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1271             try {
1272                 writeConfig($GLOBALS, isLoggedIn());
1273             }
1274             catch(Exception $e) {
1275                 error_log(
1276                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1277                     $e->getMessage()
1278                 );
1279
1280                 // TODO: do not handle exceptions/errors in JS.
1281                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1282                 exit;
1283             }
1284             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1285             exit;
1286         }
1287         else // Show the configuration form.
1288         {
1289             $PAGE = new pageBuilder;
1290             $PAGE->assign('linkcount',count($LINKSDB));
1291             $PAGE->assign('token',getToken());
1292             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1293             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1294             list($timezone_form,$timezone_js) = templateTZform($GLOBALS['timezone']);
1295             $PAGE->assign('timezone_form',$timezone_form); // FIXME: Put entire tz form generation in template?
1296             $PAGE->assign('timezone_js',$timezone_js);
1297             $PAGE->renderPage('configure');
1298             exit;
1299         }
1300     }
1301
1302     // -------- User wants to rename a tag or delete it
1303     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changetag'))
1304     {
1305         if (empty($_POST['fromtag']))
1306         {
1307             $PAGE = new pageBuilder;
1308             $PAGE->assign('linkcount',count($LINKSDB));
1309             $PAGE->assign('token',getToken());
1310             $PAGE->assign('tags', $LINKSDB->allTags());
1311             $PAGE->renderPage('changetag');
1312             exit;
1313         }
1314         if (!tokenOk($_POST['token'])) die('Wrong token.');
1315
1316         // Delete a tag:
1317         if (!empty($_POST['deletetag']) && !empty($_POST['fromtag']))
1318         {
1319             $needle=trim($_POST['fromtag']);
1320             $linksToAlter = $LINKSDB->filterTags($needle,true); // True for case-sensitive tag search.
1321             foreach($linksToAlter as $key=>$value)
1322             {
1323                 $tags = explode(' ',trim($value['tags']));
1324                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1325                 $value['tags']=trim(implode(' ',$tags));
1326                 $LINKSDB[$key]=$value;
1327             }
1328             $LINKSDB->savedb(); // Save to disk.
1329             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1330             exit;
1331         }
1332
1333         // Rename a tag:
1334         if (!empty($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag']))
1335         {
1336             $needle=trim($_POST['fromtag']);
1337             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
1338             foreach($linksToAlter as $key=>$value)
1339             {
1340                 $tags = explode(' ',trim($value['tags']));
1341                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1342                 $value['tags']=trim(implode(' ',$tags));
1343                 $LINKSDB[$key]=$value;
1344             }
1345             $LINKSDB->savedb(); // Save to disk.
1346             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1347             exit;
1348         }
1349     }
1350
1351     // -------- User wants to add a link without using the bookmarklet: Show form.
1352     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=addlink'))
1353     {
1354         $PAGE = new pageBuilder;
1355         $PAGE->assign('linkcount',count($LINKSDB));
1356         $PAGE->renderPage('addlink');
1357         exit;
1358     }
1359
1360     // -------- User clicked the "Save" button when editing a link: Save link to database.
1361     if (isset($_POST['save_edit']))
1362     {
1363         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1364         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1365         $linkdate=$_POST['lf_linkdate'];
1366         $url = trim($_POST['lf_url']);
1367         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?') && !startsWith($url,'javascript:'))
1368             $url = 'http://'.$url;
1369         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1370                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1371         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1372         $LINKSDB[$linkdate] = $link;
1373         $LINKSDB->savedb(); // Save to disk.
1374         pubsubhub();
1375
1376         // If we are called from the bookmarklet, we must close the popup:
1377         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1378         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1379         $returnurl .= '#'.smallHash($linkdate);  // Scroll to the link which has been edited.
1380         if (strstr($returnurl, "do=addlink")) { $returnurl = '?'; } //if we come from ?do=addlink, set returnurl to homepage instead
1381         header('Location: '.$returnurl); // After saving the link, redirect to the page the user was on.
1382         exit;
1383     }
1384
1385     // -------- User clicked the "Cancel" button when editing a link.
1386     if (isset($_POST['cancel_edit']))
1387     {
1388         // If we are called from the bookmarklet, we must close the popup:
1389         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1390         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1391         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1392         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1393         exit;
1394     }
1395
1396     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1397     if (isset($_POST['delete_link']))
1398     {
1399         if (!tokenOk($_POST['token'])) die('Wrong token.');
1400         // We do not need to ask for confirmation:
1401         // - confirmation is handled by JavaScript
1402         // - we are protected from XSRF by the token.
1403         $linkdate=$_POST['lf_linkdate'];
1404         unset($LINKSDB[$linkdate]);
1405         $LINKSDB->savedb(); // save to disk
1406
1407         // If we are called from the bookmarklet, we must close the popup:
1408         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1409         // Pick where we're going to redirect
1410         // =============================================================
1411         // Basically, we can't redirect to where we were previously if it was a permalink
1412         // or an edit_link, because it would 404.
1413         // Cases:
1414         //    - /             : nothing in $_GET, redirect to self
1415         //    - /?page        : redirect to self
1416         //    - /?searchterm  : redirect to self (there might be other links)
1417         //    - /?searchtags  : redirect to self
1418         //    - /permalink    : redirect to / (the link does not exist anymore)
1419         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1420         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1421         // redirect is not satisfied, and only then redirect to /
1422         $location = "?";
1423         // Self redirection
1424         if (count($_GET) == 0    ||
1425             isset($_GET['page']) ||
1426             isset($_GET['searchterm']) ||
1427             isset($_GET['searchtags'])) {
1428
1429             if (isset($_POST['returnurl'])) {
1430                 $location = $_POST['returnurl']; // Handle redirects given by the form
1431             }
1432
1433             if ($location === "?" &&
1434                 isset($_SERVER['HTTP_REFERER'])) { // Handle HTTP_REFERER in case we're not coming from the same place.
1435                 $location = $_SERVER['HTTP_REFERER'];
1436             }
1437         }
1438
1439         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1440         exit;
1441     }
1442
1443     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1444     if (isset($_GET['edit_link']))
1445     {
1446         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1447         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1448         $PAGE = new pageBuilder;
1449         $PAGE->assign('linkcount',count($LINKSDB));
1450         $PAGE->assign('link',$link);
1451         $PAGE->assign('link_is_new',false);
1452         $PAGE->assign('token',getToken()); // XSRF protection.
1453         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''));
1454         $PAGE->assign('tags', $LINKSDB->allTags());
1455         $PAGE->renderPage('editlink');
1456         exit;
1457     }
1458
1459     // -------- User want to post a new link: Display link edit form.
1460     if (isset($_GET['post']))
1461     {
1462         $url=$_GET['post'];
1463
1464
1465         // We remove the annoying parameters added by FeedBurner, GoogleFeedProxy, Facebook...
1466         $annoyingpatterns = array('/[\?&]utm_source=[^&]*/',
1467             '/[\?&]utm_campaign=[^&]*/',
1468             '/[\?&]utm_medium=[^&]*/',
1469             '/#xtor=RSS-[^&]*/',
1470             '/[\?&]fb_[^&]*/',
1471             '/[\?&]__scoop[^&]*/',
1472             '/#tk\.rss_all\?/',
1473             '/[\?&]action_ref_map=[^&]*/',
1474             '/[\?&]action_type_map=[^&]*/',
1475             '/[\?&]action_object_map=[^&]*/',
1476             '/[\?&]utm_content=[^&]*/',
1477             '/[\?&]fb=[^&]*/',
1478             '/[\?&]xtor=[^&]*/'
1479             );
1480         foreach($annoyingpatterns as $pattern)
1481         {
1482             $url = preg_replace($pattern, "", $url);
1483         }
1484
1485         $link_is_new = false;
1486         $link = $LINKSDB->getLinkFromUrl($url); // Check if URL is not already in database (in this case, we will edit the existing link)
1487         if (!$link)
1488         {
1489             $link_is_new = true;  // This is a new link
1490             $linkdate = strval(date('Ymd_His'));
1491             $title = (empty($_GET['title']) ? '' : $_GET['title'] ); // Get title if it was provided in URL (by the bookmarklet).
1492             $description = (empty($_GET['description']) ? '' : $_GET['description']); // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1493             $tags = (empty($_GET['tags']) ? '' : $_GET['tags'] ); // Get tags if it was provided in URL
1494             $private = (!empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0); // Get private if it was provided in URL
1495             if (($url!='') && parse_url($url,PHP_URL_SCHEME)=='') $url = 'http://'.$url;
1496             // If this is an HTTP link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1497             if (empty($title) && parse_url($url,PHP_URL_SCHEME)=='http')
1498             {
1499                 list($status,$headers,$data) = getHTTP($url,4); // Short timeout to keep the application responsive.
1500                 // FIXME: Decode charset according to specified in either 1) HTTP response headers or 2) <head> in html
1501                 if (strpos($status,'200 OK')!==false)
1502                                          {
1503                         // Look for charset in html header.
1504                                                 preg_match('#<meta .*charset=.*>#Usi', $data, $meta);
1505
1506                                                 // If found, extract encoding.
1507                                                 if (!empty($meta[0]))
1508                                                 {
1509                                                         // Get encoding specified in header.
1510                                                         preg_match('#charset="?(.*)"#si', $meta[0], $enc);
1511                                                         // If charset not found, use utf-8.
1512                                                         $html_charset = (!empty($enc[1])) ? strtolower($enc[1]) : 'utf-8';
1513                                                 }
1514                                                 else { $html_charset = 'utf-8'; }
1515
1516                                                 // Extract title
1517                                                 $title = html_extract_title($data);
1518                                                 if (!empty($title))
1519                                                 {
1520                                                         // Re-encode title in utf-8 if necessary.
1521                                                         $title = ($html_charset == 'iso-8859-1') ? utf8_encode($title) : $title;
1522                                                 }
1523                                         }
1524             }
1525             if ($url=='') // In case of empty URL, this is just a text (with a link that points to itself)
1526             {
1527                 $url='?'.smallHash($linkdate);
1528                 $title='Note: ';
1529             }
1530             $link = array('linkdate'=>$linkdate,'title'=>$title,'url'=>$url,'description'=>$description,'tags'=>$tags,'private'=>$private);
1531         }
1532
1533         $PAGE = new pageBuilder;
1534         $PAGE->assign('linkcount',count($LINKSDB));
1535         $PAGE->assign('link',$link);
1536         $PAGE->assign('link_is_new',$link_is_new);
1537         $PAGE->assign('token',getToken()); // XSRF protection.
1538         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : ''));
1539         $PAGE->assign('source',(isset($_GET['source']) ? $_GET['source'] : ''));
1540         $PAGE->assign('tags', $LINKSDB->allTags());
1541         $PAGE->renderPage('editlink');
1542         exit;
1543     }
1544
1545     // -------- Export as Netscape Bookmarks HTML file.
1546     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=export'))
1547     {
1548         if (empty($_GET['what']))
1549         {
1550             $PAGE = new pageBuilder;
1551             $PAGE->assign('linkcount',count($LINKSDB));
1552             $PAGE->renderPage('export');
1553             exit;
1554         }
1555         $exportWhat=$_GET['what'];
1556         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1557
1558         header('Content-Type: text/html; charset=utf-8');
1559         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1560         $currentdate=date('Y/m/d H:i:s');
1561         echo <<<HTML
1562 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1563 <!-- This is an automatically generated file.
1564      It will be read and overwritten.
1565      DO NOT EDIT! -->
1566 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1567 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1568 <TITLE>Bookmarks</TITLE>
1569 <H1>Bookmarks</H1>
1570 HTML;
1571         foreach($LINKSDB as $link)
1572         {
1573             if ($exportWhat=='all' ||
1574                ($exportWhat=='private' && $link['private']!=0) ||
1575                ($exportWhat=='public' && $link['private']==0))
1576             {
1577                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1578                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1579                 echo '>'.$link['title']."</A>\n";
1580                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1581             }
1582         }
1583                 exit;
1584     }
1585
1586     // -------- User is uploading a file for import
1587     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1588     {
1589         // If file is too big, some form field may be missing.
1590         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1591         {
1592             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1593             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1594             exit;
1595         }
1596         if (!tokenOk($_POST['token'])) die('Wrong token.');
1597         importFile();
1598         exit;
1599     }
1600
1601     // -------- Show upload/import dialog:
1602     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=import'))
1603     {
1604         $PAGE = new pageBuilder;
1605         $PAGE->assign('linkcount',count($LINKSDB));
1606         $PAGE->assign('token',getToken());
1607         $PAGE->assign('maxfilesize',getMaxFileSize());
1608         $PAGE->renderPage('import');
1609         exit;
1610     }
1611
1612     // -------- Otherwise, simply display search form and links:
1613     $PAGE = new pageBuilder;
1614     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1615     $PAGE->renderPage('linklist');
1616     exit;
1617 }
1618
1619 // -----------------------------------------------------------------------------------------------
1620 // Process the import file form.
1621 function importFile()
1622 {
1623     if (!(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'])) { die('Not allowed.'); }
1624     $LINKSDB = new LinkDB(
1625         $GLOBALS['config']['DATASTORE'],
1626         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
1627         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
1628     );
1629     $filename=$_FILES['filetoupload']['name'];
1630     $filesize=$_FILES['filetoupload']['size'];
1631     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1632     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1633     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1634     $import_count=0;
1635
1636     // Sniff file type:
1637     $type='unknown';
1638     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1639
1640     // Then import the bookmarks.
1641     if ($type=='netscape')
1642     {
1643         // This is a standard Netscape-style bookmark file.
1644         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1645         foreach(explode('<DT>',$data) as $html) // explode is very fast
1646         {
1647             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1648             $d = explode('<DD>',$html);
1649             if (startswith($d[0],'<A '))
1650             {
1651                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1652                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1653                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1654                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1655                 $raw_add_date=0;
1656                 foreach($matches as $m)
1657                 {
1658                     $attr=$m[1]; $value=$m[2];
1659                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1660                     elseif ($attr=='ADD_DATE')
1661                     {
1662                         $raw_add_date=intval($value);
1663                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1664                     }
1665                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1666                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1667                 }
1668                 if ($link['url']!='')
1669                 {
1670                     if ($private==1) $link['private']=1;
1671                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1672                     if ($dblink==false)
1673                     {  // Link not in database, let's import it...
1674                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1675
1676                        // Make sure date/time is not already used by another link.
1677                        // (Some bookmark files have several different links with the same ADD_DATE)
1678                        // We increment date by 1 second until we find a date which is not used in DB.
1679                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1680                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1681                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1682                        $LINKSDB[$link['linkdate']] = $link;
1683                        $import_count++;
1684                     }
1685                     else // Link already present in database.
1686                     {
1687                         if ($overwrite)
1688                         {   // If overwrite is required, we import link data, except date/time.
1689                             $link['linkdate']=$dblink['linkdate'];
1690                             $LINKSDB[$link['linkdate']] = $link;
1691                             $import_count++;
1692                         }
1693                     }
1694
1695                 }
1696             }
1697         }
1698         $LINKSDB->savedb();
1699
1700         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1701     }
1702     else
1703     {
1704         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1705     }
1706 }
1707
1708 // -----------------------------------------------------------------------------------------------
1709 // Template for the list of links (<div id="linklist">)
1710 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1711 function buildLinkList($PAGE,$LINKSDB)
1712 {
1713     // ---- Filter link database according to parameters
1714     $linksToDisplay=array();
1715     $search_type='';
1716     $search_crits='';
1717     if (isset($_GET['searchterm'])) // Fulltext search
1718     {
1719         $linksToDisplay = $LINKSDB->filterFulltext(trim($_GET['searchterm']));
1720         $search_crits=escape(trim($_GET['searchterm']));
1721         $search_type='fulltext';
1722     }
1723     elseif (isset($_GET['searchtags'])) // Search by tag
1724     {
1725         $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
1726         $search_crits=explode(' ',escape(trim($_GET['searchtags'])));
1727         $search_type='tags';
1728     }
1729     elseif (isset($_SERVER['QUERY_STRING']) && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/',$_SERVER['QUERY_STRING'])) // Detect smallHashes in URL
1730     {
1731         $linksToDisplay = $LINKSDB->filterSmallHash(substr(trim($_SERVER["QUERY_STRING"], '/'),0,6));
1732         if (count($linksToDisplay)==0)
1733         {
1734             header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
1735             echo '<h1>404 Not found.</h1>Oh crap. The link you are trying to reach does not exist or has been deleted.';
1736             echo '<br>You would mind <a href="?">clicking here</a>?';
1737             exit;
1738         }
1739         $search_type='permalink';
1740     }
1741     else
1742         $linksToDisplay = $LINKSDB;  // Otherwise, display without filtering.
1743
1744
1745     // Option: Show only private links
1746     if (!empty($_SESSION['privateonly']))
1747     {
1748         $tmp = array();
1749         foreach($linksToDisplay as $linkdate=>$link)
1750         {
1751             if ($link['private']!=0) $tmp[$linkdate]=$link;
1752         }
1753         $linksToDisplay=$tmp;
1754     }
1755
1756     // ---- Handle paging.
1757     /* Can someone explain to me why you get the following error when using array_keys() on an object which implements the interface ArrayAccess???
1758        "Warning: array_keys() expects parameter 1 to be array, object given in ... "
1759        If my class implements ArrayAccess, why won't array_keys() accept it ?  ( $keys=array_keys($linksToDisplay); )
1760     */
1761     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; } // Stupid and ugly. Thanks PHP.
1762
1763     // If there is only a single link, we change on-the-fly the title of the page.
1764     if (count($linksToDisplay)==1) $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1765
1766     // Select articles according to paging.
1767     $pagecount = ceil(count($keys)/$_SESSION['LINKS_PER_PAGE']);
1768     $pagecount = ($pagecount==0 ? 1 : $pagecount);
1769     $page=( empty($_GET['page']) ? 1 : intval($_GET['page']));
1770     $page = ( $page<1 ? 1 : $page );
1771     $page = ( $page>$pagecount ? $pagecount : $page );
1772     $i = ($page-1)*$_SESSION['LINKS_PER_PAGE']; // Start index.
1773     $end = $i+$_SESSION['LINKS_PER_PAGE'];
1774     $linkDisp=array(); // Links to display
1775     while ($i<$end && $i<count($keys))
1776     {
1777         $link = $linksToDisplay[$keys[$i]];
1778         $link['description']=nl2br(keepMultipleSpaces(text2clickable($link['description'])));
1779         $title=$link['title'];
1780         $classLi =  $i%2!=0 ? '' : 'publicLinkHightLight';
1781         $link['class'] = ($link['private']==0 ? $classLi : 'private');
1782         $link['timestamp']=linkdate2timestamp($link['linkdate']);
1783         $taglist = explode(' ',$link['tags']);
1784         uasort($taglist, 'strcasecmp');
1785         $link['taglist']=$taglist;
1786
1787         if ($link["url"][0] === '?' && // Check for both signs of a note: starting with ? and 7 chars long. I doubt that you'll post any links that look like this.
1788             strlen($link["url"]) === 7) {
1789             $link["url"] = indexUrl() . $link["url"];
1790         }
1791
1792         $linkDisp[$keys[$i]] = $link;
1793         $i++;
1794     }
1795
1796     // Compute paging navigation
1797     $searchterm= ( empty($_GET['searchterm']) ? '' : '&searchterm='.$_GET['searchterm'] );
1798     $searchtags= ( empty($_GET['searchtags']) ? '' : '&searchtags='.$_GET['searchtags'] );
1799     $paging='';
1800     $previous_page_url=''; if ($i!=count($keys)) $previous_page_url='?page='.($page+1).$searchterm.$searchtags;
1801     $next_page_url='';if ($page>1) $next_page_url='?page='.($page-1).$searchterm.$searchtags;
1802
1803     $token = ''; if (isLoggedIn()) $token=getToken();
1804
1805     // Fill all template fields.
1806     $PAGE->assign('linkcount',count($LINKSDB));
1807     $PAGE->assign('previous_page_url',$previous_page_url);
1808     $PAGE->assign('next_page_url',$next_page_url);
1809     $PAGE->assign('page_current',$page);
1810     $PAGE->assign('page_max',$pagecount);
1811     $PAGE->assign('result_count',count($linksToDisplay));
1812     $PAGE->assign('search_type',$search_type);
1813     $PAGE->assign('search_crits',$search_crits);
1814     $PAGE->assign('redirector',empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector']); // Optional redirector URL.
1815     $PAGE->assign('token',$token);
1816     $PAGE->assign('links',$linkDisp);
1817     $PAGE->assign('tags', $LINKSDB->allTags());
1818     return;
1819 }
1820
1821 // Compute the thumbnail for a link.
1822 //
1823 // With a link to the original URL.
1824 // Understands various services (youtube.com...)
1825 // Input: $url = URL for which the thumbnail must be found.
1826 //        $href = if provided, this URL will be followed instead of $url
1827 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1828 // Some of them may be missing.
1829 // Return an empty array if no thumbnail available.
1830 function computeThumbnail($url,$href=false)
1831 {
1832     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
1833     if ($href==false) $href=$url;
1834
1835     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1836     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1837     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1838     $domain = parse_url($url,PHP_URL_HOST);
1839     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1840     {
1841         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1842         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1843                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1844     }
1845     if ($domain=='youtu.be') // Youtube short links
1846     {
1847         $path = parse_url($url,PHP_URL_PATH);
1848         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1849                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1850     }
1851     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1852     {
1853         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1854         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1855                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1856     }
1857
1858     if ($domain=='imgur.com')
1859     {
1860         $path = parse_url($url,PHP_URL_PATH);
1861         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1862         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1863                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1864         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1865                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1866
1867         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1868                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1869     }
1870     if ($domain=='i.imgur.com')
1871     {
1872         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1873         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1874                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1875     }
1876     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1877     {
1878         if (strpos($url,'dailymotion.com/video/')!==false)
1879         {
1880             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1881             return array('src'=>$thumburl,
1882                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1883         }
1884     }
1885     if (endsWith($domain,'.imageshack.us'))
1886     {
1887         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1888         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1889         {
1890             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1891             return array('src'=>$thumburl,
1892                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1893         }
1894     }
1895
1896     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1897     // So we deport the thumbnail generation in order not to slow down page generation
1898     // (and we also cache the thumbnail)
1899
1900     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1901
1902     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1903         || $domain=='vimeo.com'
1904         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1905         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1906     )
1907     {
1908         if ($domain=='vimeo.com')
1909         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1910             $path = parse_url($url,PHP_URL_PATH);
1911             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1912         }
1913         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
1914         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
1915             $path = parse_url($url,PHP_URL_PATH);
1916             if (!preg_match('!/\d+.+?!',$path)) return array();
1917         }
1918         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
1919         {   // Make sure this TED URL points to a video (/talks/...)
1920             $path = parse_url($url,PHP_URL_PATH);
1921             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
1922         }
1923         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1924         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1925                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1926     }
1927
1928     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1929     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1930     // But using the extension will do.
1931     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1932     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1933     {
1934         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1935         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1936                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1937     }
1938     return array(); // No thumbnail.
1939
1940 }
1941
1942
1943 // Returns the HTML code to display a thumbnail for a link
1944 // with a link to the original URL.
1945 // Understands various services (youtube.com...)
1946 // Input: $url = URL for which the thumbnail must be found.
1947 //        $href = if provided, this URL will be followed instead of $url
1948 // Returns '' if no thumbnail available.
1949 function thumbnail($url,$href=false)
1950 {
1951     $t = computeThumbnail($url,$href);
1952     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1953
1954     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
1955     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1956     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1957     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1958     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1959     $html.='></a>';
1960     return $html;
1961 }
1962
1963 // Returns the HTML code to display a thumbnail for a link
1964 // for the picture wall (using lazy image loading)
1965 // Understands various services (youtube.com...)
1966 // Input: $url = URL for which the thumbnail must be found.
1967 //        $href = if provided, this URL will be followed instead of $url
1968 // Returns '' if no thumbnail available.
1969 function lazyThumbnail($url,$href=false)
1970 {
1971     $t = computeThumbnail($url,$href);
1972     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1973
1974     $html='<a href="'.escape($t['href']).'">';
1975
1976     // Lazy image
1977     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
1978
1979     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1980     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1981     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1982     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1983     $html.='>';
1984
1985     // No-JavaScript fallback.
1986     $html.='<noscript><img src="'.escape($t['src']).'"';
1987     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1988     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1989     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1990     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1991     $html.='></noscript></a>';
1992
1993     return $html;
1994 }
1995
1996
1997 // -----------------------------------------------------------------------------------------------
1998 // Installation
1999 // This function should NEVER be called if the file data/config.php exists.
2000 function install()
2001 {
2002     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2003     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2004
2005
2006     // This part makes sure sessions works correctly.
2007     // (Because on some hosts, session.save_path may not be set correctly,
2008     // or we may not have write access to it.)
2009     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2010     {   // Step 2: Check if data in session is correct.
2011         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2012         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2013         echo 'It currently points to '.session_save_path().'<br>';
2014         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2015         echo '<br><a href="?">Click to try again.</a></pre>';
2016         die;
2017     }
2018     if (!isset($_SESSION['session_tested']))
2019     {   // Step 1 : Try to store data in session and reload page.
2020         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2021         header('Location: '.indexUrl().'?test_session');  // Redirect to check stored data.
2022     }
2023     if (isset($_GET['test_session']))
2024     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2025         header('Location: '.indexUrl());
2026     }
2027
2028
2029     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2030     {
2031         $tz = 'UTC';
2032         if (!empty($_POST['continent']) && !empty($_POST['city']))
2033             if (isTZvalid($_POST['continent'],$_POST['city']))
2034                 $tz = $_POST['continent'].'/'.$_POST['city'];
2035         $GLOBALS['timezone'] = $tz;
2036         // Everything is ok, let's create config file.
2037         $GLOBALS['login'] = $_POST['setlogin'];
2038         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2039         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2040         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(indexUrl()) : $_POST['title'] );
2041         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2042         try {
2043             writeConfig($GLOBALS, isLoggedIn());
2044         }
2045         catch(Exception $e) {
2046             error_log(
2047                     'ERROR while writing config file after installation.' . PHP_EOL .
2048                     $e->getMessage()
2049                 );
2050
2051             // TODO: do not handle exceptions/errors in JS.
2052             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2053             exit;
2054         }
2055         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2056         exit;
2057     }
2058
2059     // Display config form:
2060     list($timezone_form,$timezone_js) = templateTZform();
2061     $timezone_html=''; if ($timezone_form!='') $timezone_html='<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2062
2063     $PAGE = new pageBuilder;
2064     $PAGE->assign('timezone_html',$timezone_html);
2065     $PAGE->assign('timezone_js',$timezone_js);
2066     $PAGE->renderPage('install');
2067     exit;
2068 }
2069
2070 // Generates the timezone selection form and JavaScript.
2071 // Input: (optional) current timezone (can be 'UTC/UTC'). It will be pre-selected.
2072 // Output: array(html,js)
2073 // Example: list($htmlform,$js) = templateTZform('Europe/Paris');  // Europe/Paris pre-selected.
2074 // Returns array('','') if server does not support timezones list. (e.g. PHP 5.1 on free.fr)
2075 function templateTZform($ptz=false)
2076 {
2077     if (function_exists('timezone_identifiers_list')) // because of old PHP version (5.1) which can be found on free.fr
2078     {
2079         // Try to split the provided timezone.
2080         if ($ptz==false) { $l=timezone_identifiers_list(); $ptz=$l[0]; }
2081         $spos=strpos($ptz,'/'); $pcontinent=substr($ptz,0,$spos); $pcity=substr($ptz,$spos+1);
2082
2083         // Display config form:
2084         $timezone_form = '';
2085         $timezone_js = '';
2086         // The list is in the form "Europe/Paris", "America/Argentina/Buenos_Aires"...
2087         // We split the list in continents/cities.
2088         $continents = array();
2089         $cities = array();
2090         foreach(timezone_identifiers_list() as $tz)
2091         {
2092             if ($tz=='UTC') $tz='UTC/UTC';
2093             $spos = strpos($tz,'/');
2094             if ($spos!==false)
2095             {
2096                 $continent=substr($tz,0,$spos); $city=substr($tz,$spos+1);
2097                 $continents[$continent]=1;
2098                 if (!isset($cities[$continent])) $cities[$continent]='';
2099                 $cities[$continent].='<option value="'.$city.'"'.($pcity==$city?' selected':'').'>'.$city.'</option>';
2100             }
2101         }
2102         $continents_html = '';
2103         $continents = array_keys($continents);
2104         foreach($continents as $continent)
2105             $continents_html.='<option  value="'.$continent.'"'.($pcontinent==$continent?' selected':'').'>'.$continent.'</option>';
2106         $cities_html = $cities[$pcontinent];
2107         $timezone_form = "Continent: <select name=\"continent\" id=\"continent\" onChange=\"onChangecontinent();\">${continents_html}</select>";
2108         $timezone_form .= "&nbsp;&nbsp;&nbsp;&nbsp;City: <select name=\"city\" id=\"city\">${cities[$pcontinent]}</select><br />";
2109         $timezone_js = "<script>";
2110         $timezone_js .= "function onChangecontinent(){document.getElementById(\"city\").innerHTML = citiescontinent[document.getElementById(\"continent\").value];}";
2111         $timezone_js .= "var citiescontinent = ".json_encode($cities).";" ;
2112         $timezone_js .= "</script>" ;
2113         return array($timezone_form,$timezone_js);
2114     }
2115     return array('','');
2116 }
2117
2118 // Tells if a timezone is valid or not.
2119 // If not valid, returns false.
2120 // If system does not support timezone list, returns false.
2121 function isTZvalid($continent,$city)
2122 {
2123     $tz = $continent.'/'.$city;
2124     if (function_exists('timezone_identifiers_list')) // because of old PHP version (5.1) which can be found on free.fr
2125     {
2126         if (in_array($tz, timezone_identifiers_list())) // it's a valid timezone?
2127                     return true;
2128     }
2129     return false;
2130 }
2131 if (!function_exists('json_encode')) {
2132     function json_encode($data) {
2133         switch ($type = gettype($data)) {
2134             case 'NULL':
2135                 return 'null';
2136             case 'boolean':
2137                 return ($data ? 'true' : 'false');
2138             case 'integer':
2139             case 'double':
2140             case 'float':
2141                 return $data;
2142             case 'string':
2143                 return '"' . addslashes($data) . '"';
2144             case 'object':
2145                 $data = get_object_vars($data);
2146             case 'array':
2147                 $output_index_count = 0;
2148                 $output_indexed = array();
2149                 $output_associative = array();
2150                 foreach ($data as $key => $value) {
2151                     $output_indexed[] = json_encode($value);
2152                     $output_associative[] = json_encode($key) . ':' . json_encode($value);
2153                     if ($output_index_count !== NULL && $output_index_count++ !== $key) {
2154                         $output_index_count = NULL;
2155                     }
2156                 }
2157                 if ($output_index_count !== NULL) {
2158                     return '[' . implode(',', $output_indexed) . ']';
2159                 } else {
2160                     return '{' . implode(',', $output_associative) . '}';
2161                 }
2162             default:
2163                 return ''; // Not supported
2164         }
2165     }
2166 }
2167
2168
2169
2170 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2171    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2172    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2173    This function is called by passing the URL:
2174    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2175    [URL] is the URL of the link (e.g. a flickr page)
2176    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2177    The function below will fetch the image from the webservice and store it in the cache.
2178 */
2179 function genThumbnail()
2180 {
2181     // Make sure the parameters in the URL were generated by us.
2182     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2183     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2184
2185     // Let's see if we don't already have the image for this URL in the cache.
2186     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2187     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2188     {   // We have the thumbnail, just serve it:
2189         header('Content-Type: image/jpeg');
2190         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2191         return;
2192     }
2193     // We may also serve a blank image (if service did not respond)
2194     $blankname=hash('sha1',$_GET['url']).'.gif';
2195     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2196     {
2197         header('Content-Type: image/gif');
2198         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2199         return;
2200     }
2201
2202     // Otherwise, generate the thumbnail.
2203     $url = $_GET['url'];
2204     $domain = parse_url($url,PHP_URL_HOST);
2205
2206     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2207     {
2208         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2209         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2210
2211         // Is this a link to an image, or to a flickr page ?
2212         $imageurl='';
2213         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2214         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2215             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2216             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2217         }
2218         else // This is a flickr page (html)
2219         {
2220             list($httpstatus,$headers,$data) = getHTTP($url,20); // Get the flickr html page.
2221             if (strpos($httpstatus,'200 OK')!==false)
2222             {
2223                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2224                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!',$data,$matches);
2225                 if (!empty($matches[1])) $imageurl=$matches[1];
2226
2227                 // In albums (and some other pages), the link rel="image_src" is not provided,
2228                 // but flickr provides:
2229                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2230                 if ($imageurl=='')
2231                 {
2232                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!',$data,$matches);
2233                     if (!empty($matches[1])) $imageurl=$matches[1];
2234                 }
2235             }
2236         }
2237
2238         if ($imageurl!='')
2239         {   // Let's download the image.
2240             list($httpstatus,$headers,$data) = getHTTP($imageurl,10); // Image is 240x120, so 10 seconds to download should be enough.
2241             if (strpos($httpstatus,'200 OK')!==false)
2242             {
2243                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2244                 header('Content-Type: image/jpeg');
2245                 echo $data;
2246                 return;
2247             }
2248         }
2249     }
2250
2251     elseif ($domain=='vimeo.com' )
2252     {
2253         // This is more complex: we have to perform a HTTP request, then parse the result.
2254         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2255         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2256         list($httpstatus,$headers,$data) = getHTTP('https://vimeo.com/api/v2/video/'.escape($vid).'.php',5);
2257         if (strpos($httpstatus,'200 OK')!==false)
2258         {
2259             $t = unserialize($data);
2260             $imageurl = $t[0]['thumbnail_medium'];
2261             // Then we download the image and serve it to our client.
2262             list($httpstatus,$headers,$data) = getHTTP($imageurl,10);
2263             if (strpos($httpstatus,'200 OK')!==false)
2264             {
2265                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2266                 header('Content-Type: image/jpeg');
2267                 echo $data;
2268                 return;
2269             }
2270         }
2271     }
2272
2273     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2274     {
2275         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2276         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2277         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2278         list($httpstatus,$headers,$data) = getHTTP($url,5);
2279         if (strpos($httpstatus,'200 OK')!==false)
2280         {
2281             // Extract the link to the thumbnail
2282             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!',$data,$matches);
2283             if (!empty($matches[1]))
2284             {   // Let's download the image.
2285                 $imageurl=$matches[1];
2286                 list($httpstatus,$headers,$data) = getHTTP($imageurl,20); // No control on image size, so wait long enough.
2287                 if (strpos($httpstatus,'200 OK')!==false)
2288                 {
2289                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2290                     file_put_contents($filepath,$data); // Save image to cache.
2291                     if (resizeImage($filepath))
2292                     {
2293                         header('Content-Type: image/jpeg');
2294                         echo file_get_contents($filepath);
2295                         return;
2296                     }
2297                 }
2298             }
2299         }
2300     }
2301
2302     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2303     {
2304         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2305         // http://xkcd.com/327/
2306         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2307         list($httpstatus,$headers,$data) = getHTTP($url,5);
2308         if (strpos($httpstatus,'200 OK')!==false)
2309         {
2310             // Extract the link to the thumbnail
2311             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!',$data,$matches);
2312             if (!empty($matches[1]))
2313             {   // Let's download the image.
2314                 $imageurl=$matches[1];
2315                 list($httpstatus,$headers,$data) = getHTTP($imageurl,20); // No control on image size, so wait long enough.
2316                 if (strpos($httpstatus,'200 OK')!==false)
2317                 {
2318                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2319                     file_put_contents($filepath,$data); // Save image to cache.
2320                     if (resizeImage($filepath))
2321                     {
2322                         header('Content-Type: image/jpeg');
2323                         echo file_get_contents($filepath);
2324                         return;
2325                     }
2326                 }
2327             }
2328         }
2329     }
2330
2331     else
2332     {
2333         // For all other domains, we try to download the image and make a thumbnail.
2334         list($httpstatus,$headers,$data) = getHTTP($url,30);  // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2335         if (strpos($httpstatus,'200 OK')!==false)
2336         {
2337             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2338             file_put_contents($filepath,$data); // Save image to cache.
2339             if (resizeImage($filepath))
2340             {
2341                 header('Content-Type: image/jpeg');
2342                 echo file_get_contents($filepath);
2343                 return;
2344             }
2345         }
2346     }
2347
2348
2349     // Otherwise, return an empty image (8x8 transparent gif)
2350     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2351     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2352     header('Content-Type: image/gif');
2353     echo $blankgif;
2354 }
2355
2356 // Make a thumbnail of the image (to width: 120 pixels)
2357 // Returns true if success, false otherwise.
2358 function resizeImage($filepath)
2359 {
2360     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2361
2362     // Trick: some stupid people rename GIF as JPEG... or else.
2363     // So we really try to open each image type whatever the extension is.
2364     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2365     $im=false;
2366     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2367     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2368     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2369     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2370     $w = imagesx($im);
2371     $h = imagesy($im);
2372     $ystart = 0; $yheight=$h;
2373     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2374     $nw = 120;   // Desired width
2375     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2376     // Resize image:
2377     $im2 = imagecreatetruecolor($nw,$nh);
2378     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2379     imageinterlace($im2,true); // For progressive JPEG.
2380     $tempname=$filepath.'_TEMP.jpg';
2381     imagejpeg($im2, $tempname, 90);
2382     imagedestroy($im);
2383     imagedestroy($im2);
2384     unlink($filepath);
2385     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2386     return true;
2387 }
2388
2389 // Invalidate caches when the database is changed or the user logs out.
2390 // (e.g. tags cache).
2391 function invalidateCaches()
2392 {
2393     unset($_SESSION['tags']);  // Purge cache attached to session.
2394     pageCache::purgeCache();   // Purge page cache shared by sessions.
2395 }
2396
2397 try {
2398     mergeDeprecatedConfig($GLOBALS, isLoggedIn());
2399 } catch(Exception $e) {
2400     error_log(
2401         'ERROR while merging deprecated options.php file.' . PHP_EOL .
2402         $e->getMessage()
2403     );
2404 }
2405
2406 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2407 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2408 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2409 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2410 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=daily')) { showDaily(); exit; }
2411 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2412 renderPage();
2413 ?>