index.php

   1 <?php
   2 // Shaarli 0.0.42 beta - Shaare your links...
   3 // The personal, minimalist, super-fast, no-database delicious clone. By sebsauvage.net
   4 // http://sebsauvage.net/wiki/doku.php?id=php:shaarli
   5 // Licence: http://www.opensource.org/licenses/zlib-license.php
   6 // Requires: php 5.1.x  (but autocomplete fields will only work if you have php 5.2.x)
   7 // -----------------------------------------------------------------------------------------------
   8 // NEVER TRUST IN PHP.INI
   9 // Some hosts do not define a default timezone in php.ini,
  10 // so we have to do this for avoid the strict standard error.
  11 date_default_timezone_set('UTC');
  12
  13 // -----------------------------------------------------------------------------------------------
  14 // Hardcoded parameter (These parameters can be overwritten by creating the file /config/options.php)
  15 $GLOBALS['config']['DATADIR'] = 'data'; // Data subdirectory
  16 $GLOBALS['config']['CONFIG_FILE'] = $GLOBALS['config']['DATADIR'].'/config.php'; // Configuration file (user login/password)
  17 $GLOBALS['config']['DATASTORE'] = $GLOBALS['config']['DATADIR'].'/datastore.php'; // Data storage file.
  18 $GLOBALS['config']['LINKS_PER_PAGE'] = 20; // Default links per page.
  19 $GLOBALS['config']['IPBANS_FILENAME'] = $GLOBALS['config']['DATADIR'].'/ipbans.php'; // File storage for failures and bans.
  20 $GLOBALS['config']['BAN_AFTER'] = 4;        // Ban IP after this many failures.
  21 $GLOBALS['config']['BAN_DURATION'] = 1800;  // Ban duration for IP address after login failures (in seconds) (1800 sec. = 30 minutes)
  22 $GLOBALS['config']['OPEN_SHAARLI'] = false; // If true, anyone can add/edit/delete links without having to login
  23 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false; // If true, the moment when links were saved are not shown to users that are not logged in.
  24 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true; // Enable thumbnails in links.
  25 $GLOBALS['config']['CACHEDIR'] = 'cache'; // Cache directory for thumbnails for SLOW services (like flickr)
  26 $GLOBALS['config']['PAGECACHE'] = 'pagecache'; // Page cache directory.
  27 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true; // Enable Shaarli to store thumbnail in a local cache. Disable to reduce webspace usage.
  28 $GLOBALS['config']['PUBSUBHUB_URL'] = ''; // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
  29 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp' ; // Raintpl cache directory
  30 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/' ; // Raintpl template directory (keep the trailling slash!)
  31 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt'; // For updates check of Shaarli.
  32 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400 ; // Updates check frequency for Shaarli. 86400 seconds=24 hours
  33                                           // Note: You must have publisher.php in the same directory as Shaarli index.php
  34 // -----------------------------------------------------------------------------------------------
  35 // You should not touch below (or at your own risks !)
  36 // Optionnal config file.
  37 if (is_file($GLOBALS['config']['DATADIR'].'/options.php')) require($GLOBALS['config']['DATADIR'].'/options.php');
  38
  39 define('shaarli_version','0.0.42 beta');
  40 define('PHPPREFIX','<?php /* '); // Prefix to encapsulate data in php code.
  41 define('PHPSUFFIX',' */ ?>'); // Suffix to encapsulate data in php code.
  42 // http://server.com/x/shaarli --> /shaarli/
  43 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
  44
  45 // Force cookie path (but do not change lifetime)
  46 $cookie=session_get_cookie_params();
  47 $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
  48 session_set_cookie_params($cookie['lifetime'],$cookiedir,$_SERVER['HTTP_HOST']); // Set default cookie expiration and path.
  49
  50 // Set session parameters on server side.
  51 define('INACTIVITY_TIMEOUT',3600); // (in seconds). If the user does not access any page within this time, his/her session is considered expired.
  52 ini_set('session.use_cookies', 1);       // Use cookies to store session.
  53 ini_set('session.use_only_cookies', 1);  // Force cookies for session (phpsessionID forbidden in URL)
  54 ini_set('session.use_trans_sid', false); // Prevent php to use sessionID in URL if cookies are disabled.
  55 session_name('shaarli');
  56 if (session_id() == '') session_start();  // Start session if needed (Some server auto-start sessions).
  57
  58 // PHP Settings
  59 ini_set('max_input_time','60');  // High execution time in case of problematic imports/exports.
  60 ini_set('memory_limit', '128M');  // Try to set max upload file size and read (May not work on some hosts).
  61 ini_set('post_max_size', '16M');
  62 ini_set('upload_max_filesize', '16M');
  63 checkphpversion();
  64 error_reporting(E_ALL^E_WARNING);  // See all error except warnings.
  65 //error_reporting(-1); // See all errors (for debugging only)
  66
  67 include "inc/rain.tpl.class.php"; //include Rain TPL
  68 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
  69 if (!is_dir($GLOBALS['config']['RAINTPL_TMP'])) { mkdir($GLOBALS['config']['RAINTPL_TMP'],0705); chmod($GLOBALS['config']['RAINTPL_TMP'],0705); }
  70 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
  71
  72 ob_start();  // Output buffering for the page cache.
  73
  74
  75 // In case stupid admin has left magic_quotes enabled in php.ini:
  76 if (get_magic_quotes_gpc())
  77 {
  78     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
  79     $_POST = array_map('stripslashes_deep', $_POST);
  80     $_GET = array_map('stripslashes_deep', $_GET);
  81     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
  82 }
  83
  84 // Prevent caching on client side or proxy: (yes, it's ugly)
  85 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
  86 header("Cache-Control: no-store, no-cache, must-revalidate");
  87 header("Cache-Control: post-check=0, pre-check=0", false);
  88 header("Pragma: no-cache");
  89
  90 // Directories creations (Note that your web host may require differents rights than 705.)
  91 if (!is_writable(realpath(dirname(__FILE__)))) die('<pre>ERROR: Shaarli does not have the right to write in its own directory ('.realpath(dirname(__FILE__)).').</pre>');
  92 if (!is_dir($GLOBALS['config']['DATADIR'])) { mkdir($GLOBALS['config']['DATADIR'],0705); chmod($GLOBALS['config']['DATADIR'],0705); }
  93 if (!is_dir($GLOBALS['config']['RAINTPL_TMP'])) { mkdir($GLOBALS['config']['RAINTPL_TMP'],0705);chmod($GLOBALS['config']['RAINTPL_TMP'],0705); } // For RainTPL temporary files.
  94 if (!is_file($GLOBALS['config']['DATADIR'].'/.htaccess')) { file_put_contents($GLOBALS['config']['DATADIR'].'/.htaccess',"Allow from none\nDeny from all\n"); } // Protect data files.
  95 // Second check to see if Shaarli can write in its directory, because on some hosts is_writable() is not reliable.
  96 if (!is_file($GLOBALS['config']['DATADIR'].'/.htaccess')) die('<pre>ERROR: Shaarli does not have the right to write in its data directory ('.realpath($GLOBALS['config']['DATADIR']).').</pre>');
  97 if ($GLOBALS['config']['ENABLE_LOCALCACHE'])
  98 {
  99     if (!is_dir($GLOBALS['config']['CACHEDIR'])) { mkdir($GLOBALS['config']['CACHEDIR'],0705); chmod($GLOBALS['config']['CACHEDIR'],0705); }
 100     if (!is_file($GLOBALS['config']['CACHEDIR'].'/.htaccess')) { file_put_contents($GLOBALS['config']['CACHEDIR'].'/.htaccess',"Allow from none\nDeny from all\n"); } // Protect data files.
 101 }
 102
 103 // Handling of old config file which do not have the new parameters.
 104 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.htmlspecialchars(indexUrl());
 105 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 106 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 107 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 108 if (empty($GLOBALS['disablejquery'])) $GLOBALS['disablejquery']=false;
 109 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 110 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 111 // I really need to rewrite Shaarli with a proper configuation manager.
 112
 113 // Run config screen if first run:
 114 if (!is_file($GLOBALS['config']['CONFIG_FILE'])) install();
 115
 116 require $GLOBALS['config']['CONFIG_FILE'];  // Read login/password hash into $GLOBALS.
 117
 118 // a token depending of deployment salt, user password, and the current ip
 119 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 120
 121 autoLocale(); // Sniff browser language and set date format accordingly.
 122 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 123
 124 // Check php version
 125 function checkphpversion()
 126 {
 127     if (version_compare(PHP_VERSION, '5.1.0') < 0)
 128     {
 129         header('Content-Type: text/plain; charset=utf-8');
 130         echo 'Your server supports php '.PHP_VERSION.'. Shaarli requires at least php 5.1.0, and thus cannot run. Sorry.';
 131         exit;
 132     }
 133 }
 134
 135 // Checks if an update is available for Shaarli.
 136 // (at most once a day, and only for registered user.)
 137 // Output: '' = no new version.
 138 //         other= the available version.
 139 function checkUpdate()
 140 {
 141     if (!isLoggedIn()) return ''; // Do not check versions for visitors.
 142
 143     // Get latest version number at most once a day.
 144     if (!is_file($GLOBALS['config']['UPDATECHECK_FILENAME']) || (filemtime($GLOBALS['config']['UPDATECHECK_FILENAME'])<time()-($GLOBALS['config']['UPDATECHECK_INTERVAL'])))
 145     {
 146         $version=shaarli_version;
 147         list($httpstatus,$headers,$data) = getHTTP('http://sebsauvage.net/files/shaarli_version.txt',2);
 148         if (strpos($httpstatus,'200 OK')!==false) $version=$data;
 149         // If failed, nevermind. We don't want to bother the user with that.
 150         file_put_contents($GLOBALS['config']['UPDATECHECK_FILENAME'],$version); // touch file date
 151     }
 152     // Compare versions:
 153     $newestversion=file_get_contents($GLOBALS['config']['UPDATECHECK_FILENAME']);
 154     if (version_compare($newestversion,shaarli_version)==1) return $newestversion;
 155     return '';
 156 }
 157
 158
 159 // -----------------------------------------------------------------------------------------------
 160 // Simple cache system (mainly for the RSS/ATOM feeds).
 161
 162 class pageCache
 163 {
 164     private $url; // Full URL of the page to cache (typically the value returned by pageUrl())
 165     private $shouldBeCached; // boolean: Should this url be cached ?
 166     private $filename; // Name of the cache file for this url
 167
 168     /*
 169          $url = url (typically the value returned by pageUrl())
 170          $shouldBeCached = boolean. If false, the cache will be disabled.
 171     */
 172     public function __construct($url,$shouldBeCached)
 173     {
 174         $this->url = $url;
 175         $this->filename = $GLOBALS['config']['PAGECACHE'].'/'.sha1($url).'.cache';
 176         $this->shouldBeCached = $shouldBeCached;
 177     }
 178
 179     // If the page should be cached and a cached version exists,
 180     // returns the cached version (otherwise, return null).
 181     public function cachedVersion()
 182     {
 183         if (!$this->shouldBeCached) return null;
 184         if (is_file($this->filename)) { return file_get_contents($this->filename); exit; }
 185         return null;
 186     }
 187
 188     // Put a page in the cache.
 189     public function cache($page)
 190     {
 191         if (!$this->shouldBeCached) return;
 192         if (!is_dir($GLOBALS['config']['PAGECACHE'])) { mkdir($GLOBALS['config']['PAGECACHE'],0705); chmod($GLOBALS['config']['PAGECACHE'],0705); }
 193         file_put_contents($this->filename,$page);
 194     }
 195
 196     // Purge the whole cache.
 197     // (call with pageCache::purgeCache())
 198     public static function purgeCache()
 199     {
 200         if (is_dir($GLOBALS['config']['PAGECACHE']))
 201         {
 202             $handler = opendir($GLOBALS['config']['PAGECACHE']);
 203             if ($handler!==false)
 204             {
 205                 while (($filename = readdir($handler))!==false)
 206                 {
 207                     if (endsWith($filename,'.cache')) { unlink($GLOBALS['config']['PAGECACHE'].'/'.$filename); }
 208                 }
 209                 closedir($handler);
 210             }
 211         }
 212     }
 213
 214 }
 215
 216
 217 // -----------------------------------------------------------------------------------------------
 218 // Log to text file
 219 function logm($message)
 220 {
 221     $t = strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n";
 222     file_put_contents($GLOBALS['config']['DATADIR'].'/log.txt',$t,FILE_APPEND);
 223 }
 224
 225 // Same as nl2br(), but escapes < and >
 226 function nl2br_escaped($html)
 227 {
 228     return str_replace('>','&gt;',str_replace('<','&lt;',nl2br($html)));
 229 }
 230
 231 /* Returns the small hash of a string, using RFC 4648 base64url format
 232    eg. smallHash('20111006_131924') --> yZH23w
 233    Small hashes:
 234      - are unique (well, as unique as crc32, at last)
 235      - are always 6 characters long.
 236      - only use the following characters: a-z A-Z 0-9 - _ @
 237      - are NOT cryptographically secure (they CAN be forged)
 238    In Shaarli, they are used as a tinyurl-like link to individual entries.
 239 */
 240 function smallHash($text)
 241 {
 242     $t = rtrim(base64_encode(hash('crc32',$text,true)),'=');
 243     return strtr($t, '+/', '-_');
 244 }
 245
 246 // In a string, converts urls to clickable links.
 247 // Function inspired from http://www.php.net/manual/en/function.preg-replace.php#85722
 248 function text2clickable($url)
 249 {
 250     $redir = empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'];
 251     return preg_replace('!(((?:https?|ftp|file)://|apt:|magnet:)\S+[[:alnum:]]/?)!si','<a href="'.$redir.'$1" rel="nofollow">$1</a>',$url);
 252 }
 253
 254 // This function inserts &nbsp; where relevant so that multiple spaces are properly displayed in HTML
 255 // even in the absence of <pre>  (This is used in description to keep text formatting)
 256 function keepMultipleSpaces($text)
 257 {
 258     return str_replace('  ',' &nbsp;',$text);
 259
 260 }
 261 // ------------------------------------------------------------------------------------------
 262 // Sniff browser language to display dates in the right format automatically.
 263 // (Note that is may not work on your server if the corresponding local is not installed.)
 264 function autoLocale()
 265 {
 266     $loc='en_US'; // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 267     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // eg. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 268     {   // (It's a bit crude, but it works very well. Prefered language is always presented first.)
 269         if (preg_match('/([a-z]{2}(-[a-z]{2})?)/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) $loc=$matches[1];
 270     }
 271     setlocale(LC_TIME,$loc);  // LC_TIME = Set local for date/time format only.
 272 }
 273
 274 // ------------------------------------------------------------------------------------------
 275 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 276 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 277 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 278 function pubsubhub()
 279 {
 280     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 281     {
 282        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 283        $topic_url = array (
 284                        indexUrl().'?do=atom',
 285                        indexUrl().'?do=rss'
 286                     );
 287        $p->publish_update($topic_url);
 288     }
 289 }
 290
 291 // ------------------------------------------------------------------------------------------
 292 // Session management
 293
 294 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 295 function allIPs()
 296 {
 297     $ip = $_SERVER["REMOTE_ADDR"];
 298     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 299     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 300     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 301     return $ip;
 302 }
 303
 304 function fillSessionInfo() {
 305         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // generate unique random number (different than phpsessionid)
 306         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 307         $_SESSION['username']=$GLOBALS['login'];
 308         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 309 }
 310
 311 // Check that user/password is correct.
 312 function check_auth($login,$password)
 313 {
 314     $hash = sha1($password.$login.$GLOBALS['salt']);
 315     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 316     {   // Login/password is correct.
 317                 fillSessionInfo();
 318         logm('Login successful');
 319         return True;
 320     }
 321     logm('Login failed for user '.$login);
 322     return False;
 323 }
 324
 325 // Returns true if the user is logged in.
 326 function isLoggedIn()
 327 {
 328     if ($GLOBALS['config']['OPEN_SHAARLI']) return true;
 329
 330     if (!isset($GLOBALS['login'])) return false;  // Shaarli is not configured yet.
 331
 332         if (@$_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN)
 333         {
 334                 fillSessionInfo();
 335                 return true;
 336         }
 337     // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 338     if (empty($_SESSION['uid']) || ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) || time()>=$_SESSION['expires_on'])
 339     {
 340         logout();
 341         return false;
 342     }
 343     if (!empty($_SESSION['longlastingsession']))  $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 344     else $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 345
 346     return true;
 347 }
 348
 349 // Force logout.
 350 function logout() { if (isset($_SESSION)) { unset($_SESSION['uid']); unset($_SESSION['ip']); unset($_SESSION['username']); unset($_SESSION['privateonly']); }
 351 setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 352 }
 353
 354
 355 // ------------------------------------------------------------------------------------------
 356 // Brute force protection system
 357 // Several consecutive failed logins will ban the IP address for 30 minutes.
 358 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?>");
 359 include $GLOBALS['config']['IPBANS_FILENAME'];
 360 // Signal a failed login. Will ban the IP if too many failures:
 361 function ban_loginFailed()
 362 {
 363     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 364     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 365     $gb['FAILURES'][$ip]++;
 366     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 367     {
 368         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 369         logm('IP address banned from login');
 370     }
 371     $GLOBALS['IPBANS'] = $gb;
 372     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 373 }
 374
 375 // Signals a successful login. Resets failed login counter.
 376 function ban_loginOk()
 377 {
 378     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 379     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 380     $GLOBALS['IPBANS'] = $gb;
 381     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 382 }
 383
 384 // Checks if the user CAN login. If 'true', the user can try to login.
 385 function ban_canLogin()
 386 {
 387     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 388     if (isset($gb['BANS'][$ip]))
 389     {
 390         // User is banned. Check if the ban has expired:
 391         if ($gb['BANS'][$ip]<=time())
 392         {   // Ban expired, user can try to login again.
 393             logm('Ban lifted.');
 394             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 395             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 396             return true; // Ban has expired, user can login.
 397         }
 398         return false; // User is banned.
 399     }
 400     return true; // User is not banned.
 401 }
 402
 403 // ------------------------------------------------------------------------------------------
 404 // Process login form: Check if login/password is correct.
 405 if (isset($_POST['login']))
 406 {
 407     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 408     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 409     {   // Login/password is ok.
 410         ban_loginOk();
 411         // If user wants to keep the session cookie even after the browser closes:
 412         if (!empty($_POST['longlastingsession']))
 413         {
 414                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 415             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 416             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 417
 418             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 419             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['HTTP_HOST']); // Set session cookie expiration on client side
 420             // Note: Never forget the trailing slash on the cookie path !
 421             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 422         }
 423         else // Standard session expiration (=when browser closes)
 424         {
 425             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 426             session_set_cookie_params(0,$cookiedir,$_SERVER['HTTP_HOST']); // 0 means "When browser closes"
 427             session_regenerate_id(true);
 428         }
 429         // Optional redirect after login:
 430         if (isset($_GET['post'])) { header('Location: ?post='.urlencode($_GET['post']).(!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').(!empty($_GET['source'])?'&source='.urlencode($_GET['source']):'')); exit; }
 431         if (isset($_POST['returnurl']))
 432         {
 433             if (endsWith($_POST['returnurl'],'?do=login')) { header('Location: ?'); exit; } // Prevent loops over login screen.
 434             header('Location: '.$_POST['returnurl']); exit;
 435         }
 436         header('Location: ?'); exit;
 437     }
 438     else
 439     {
 440         ban_loginFailed();
 441         $redir = '';
 442         if (isset($_GET['post'])) { $redir = '&post='.urlencode($_GET['post']).(!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').(!empty($_GET['source'])?'&source='.urlencode($_GET['source']):'');  }
 443         echo '<script language="JavaScript">alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 444         exit;
 445     }
 446 }
 447
 448 // ------------------------------------------------------------------------------------------
 449 // Misc utility functions:
 450
 451 // Returns the server URL (including port and http/https), without path.
 452 // eg. "http://myserver.com:8080"
 453 // You can append $_SERVER['SCRIPT_NAME'] to get the current script URL.
 454 function serverUrl()
 455 {
 456     $https = (!empty($_SERVER['HTTPS']) && (strtolower($_SERVER['HTTPS'])=='on')) || $_SERVER["SERVER_PORT"]=='443'; // HTTPS detection.
 457     $serverport = ($_SERVER["SERVER_PORT"]=='80' || ($https && $_SERVER["SERVER_PORT"]=='443') ? '' : ':'.$_SERVER["SERVER_PORT"]);
 458     return 'http'.($https?'s':'').'://'.$_SERVER['HTTP_HOST'].$serverport;
 459 }
 460
 461 // Returns the absolute URL of current script, without the query.
 462 // (eg. http://sebsauvage.net/links/)
 463 function indexUrl()
 464 {
 465     $scriptname = $_SERVER["SCRIPT_NAME"];
 466     // If the script is named 'index.php', we remove it (for better looking URLs,
 467     // eg. http://mysite.com/shaarli/?abcde instead of http://mysite.com/shaarli/index.php?abcde)
 468     if (endswith($scriptname,'index.php')) $scriptname = substr($scriptname,0,strlen($scriptname)-9);
 469     return serverUrl() . $scriptname;
 470 }
 471
 472 // Returns the absolute URL of current script, WITH the query.
 473 // (eg. http://sebsauvage.net/links/?toto=titi&spamspamspam=humbug)
 474 function pageUrl()
 475 {
 476     return indexUrl().(!empty($_SERVER["QUERY_STRING"]) ? '?'.$_SERVER["QUERY_STRING"] : '');
 477 }
 478
 479 // Convert post_max_size/upload_max_filesize (eg.'16M') parameters to bytes.
 480 function return_bytes($val)
 481 {
 482     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 483     switch($last)
 484     {
 485         case 'g': $val *= 1024;
 486         case 'm': $val *= 1024;
 487         case 'k': $val *= 1024;
 488     }
 489     return $val;
 490 }
 491
 492 // Try to determine max file size for uploads (POST).
 493 // Returns an integer (in bytes)
 494 function getMaxFileSize()
 495 {
 496     $size1 = return_bytes(ini_get('post_max_size'));
 497     $size2 = return_bytes(ini_get('upload_max_filesize'));
 498     // Return the smaller of two:
 499     $maxsize = min($size1,$size2);
 500     // FIXME: Then convert back to readable notations ? (eg. 2M instead of 2000000)
 501     return $maxsize;
 502 }
 503
 504 // Tells if a string start with a substring or not.
 505 function startsWith($haystack,$needle,$case=true)
 506 {
 507     if($case){return (strcmp(substr($haystack, 0, strlen($needle)),$needle)===0);}
 508     return (strcasecmp(substr($haystack, 0, strlen($needle)),$needle)===0);
 509 }
 510
 511 // Tells if a string ends with a substring or not.
 512 function endsWith($haystack,$needle,$case=true)
 513 {
 514     if($case){return (strcmp(substr($haystack, strlen($haystack) - strlen($needle)),$needle)===0);}
 515     return (strcasecmp(substr($haystack, strlen($haystack) - strlen($needle)),$needle)===0);
 516 }
 517
 518 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 519     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 520     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 521 function linkdate2timestamp($linkdate)
 522 {
 523     $Y=$M=$D=$h=$m=$s=0;
 524     $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 525     return mktime($h,$m,$s,$M,$D,$Y);
 526 }
 527
 528 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 529     (used to build the pubDate attribute in RSS feed.)  */
 530 function linkdate2rfc822($linkdate)
 531 {
 532     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 533 }
 534
 535 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 536     (used to build the updated tags in ATOM feed.)  */
 537 function linkdate2iso8601($linkdate)
 538 {
 539     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 540 }
 541
 542 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a localized date format.
 543     (used to display link date on screen)
 544     The date format is automatically chosen according to locale/languages sniffed from browser headers (see autoLocale()). */
 545 function linkdate2locale($linkdate)
 546 {
 547     return utf8_encode(strftime('%c',linkdate2timestamp($linkdate))); // %c is for automatic date format according to locale.
 548     // Note that if you use a local which is not installed on your webserver,
 549     // the date will not be displayed in the chosen locale, but probably in US notation.
 550 }
 551
 552 // Parse HTTP response headers and return an associative array.
 553 function http_parse_headers_shaarli( $headers )
 554 {
 555     $res=array();
 556     foreach($headers as $header)
 557     {
 558         $i = strpos($header,': ');
 559         if ($i!==false)
 560         {
 561             $key=substr($header,0,$i);
 562             $value=substr($header,$i+2,strlen($header)-$i-2);
 563             $res[$key]=$value;
 564         }
 565     }
 566     return $res;
 567 }
 568
 569 /* GET an URL.
 570    Input: $url : url to get (http://...)
 571           $timeout : Network timeout (will wait this many seconds for an anwser before giving up).
 572    Output: An array.  [0] = HTTP status message (eg. "HTTP/1.1 200 OK") or error message
 573                       [1] = associative array containing HTTP response headers (eg. echo getHTTP($url)[1]['Content-Type'])
 574                       [2] = data
 575     Example: list($httpstatus,$headers,$data) = getHTTP('http://sebauvage.net/');
 576              if (strpos($httpstatus,'200 OK')!==false)
 577                  echo 'Data type: '.htmlspecialchars($headers['Content-Type']);
 578              else
 579                  echo 'There was an error: '.htmlspecialchars($httpstatus)
 580 */
 581 function getHTTP($url,$timeout=30)
 582 {
 583     try
 584     {
 585         $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
 586         $context = stream_context_create($options);
 587         $data=file_get_contents($url,false,$context,-1, 4000000); // We download at most 4 Mb from source.
 588         if (!$data) { return array('HTTP Error',array(),''); }
 589         $httpStatus=$http_response_header[0]; // eg. "HTTP/1.1 200 OK"
 590         $responseHeaders=http_parse_headers_shaarli($http_response_header);
 591         return array($httpStatus,$responseHeaders,$data);
 592     }
 593     catch (Exception $e)  // getHTTP *can* fail silentely (we don't care if the title cannot be fetched)
 594     {
 595         return array($e->getMessage(),'','');
 596     }
 597 }
 598
 599 // Extract title from an HTML document.
 600 // (Returns an empty string if not found.)
 601 function html_extract_title($html)
 602 {
 603   return preg_match('!<title>(.*?)</title>!is', $html, $matches) ? trim(str_replace("\n",' ', $matches[1])) : '' ;
 604 }
 605
 606 // ------------------------------------------------------------------------------------------
 607 // Token management for XSRF protection
 608 // Token should be used in any form which acts on data (create,update,delete,import...).
 609 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 610
 611 // Returns a token.
 612 function getToken()
 613 {
 614     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 615     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 616     return $rnd;
 617 }
 618
 619 // Tells if a token is ok. Using this function will destroy the token.
 620 // true=token is ok.
 621 function tokenOk($token)
 622 {
 623     if (isset($_SESSION['tokens'][$token]))
 624     {
 625         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 626         return true; // Token is ok.
 627     }
 628     return false; // Wrong token, or already used.
 629 }
 630
 631 // ------------------------------------------------------------------------------------------
 632 /* This class is in charge of building the final page.
 633    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 634    p = new pageBuilder;
 635    p.assign('myfield','myvalue');
 636    p.renderPage('mytemplate');
 637
 638 */
 639 class pageBuilder
 640 {
 641     private $tpl; // RainTPL template
 642
 643     function __construct()
 644     {
 645         $this->tpl=false;
 646     }
 647
 648     private function initialize()
 649     {
 650         $this->tpl = new RainTPL;
 651         $this->tpl->assign('newversion',checkUpdate());
 652         $this->tpl->assign('feedurl',htmlspecialchars(indexUrl()));
 653         $searchcrits=''; // Search criteria
 654         if (!empty($_GET['searchtags'])) $searchcrits.='&searchtags='.urlencode($_GET['searchtags']);
 655         elseif (!empty($_GET['searchterm'])) $searchcrits.='&searchterm='.urlencode($_GET['searchterm']);
 656         $this->tpl->assign('searchcrits',$searchcrits);
 657         $this->tpl->assign('source',indexUrl());
 658         $this->tpl->assign('version',shaarli_version);
 659         $this->tpl->assign('scripturl',indexUrl());
 660         $this->tpl->assign('pagetitle','Shaarli');
 661         $this->tpl->assign('privateonly',!empty($_SESSION['privateonly'])); // Show only private links ?
 662         if (!empty($GLOBALS['title'])) $this->tpl->assign('pagetitle',$GLOBALS['title']);
 663         if (!empty($GLOBALS['titleLink'])) $this->tpl->assign('titleLink',$GLOBALS['titleLink']);
 664         if (!empty($GLOBALS['pagetitle'])) $this->tpl->assign('pagetitle',$GLOBALS['pagetitle']);
 665         $this->tpl->assign('shaarlititle',empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title'] );
 666         return;
 667     }
 668
 669     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 670     public function assign($what,$where)
 671     {
 672         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 673         $this->tpl->assign($what,$where);
 674     }
 675
 676     // Render a specific page (using a template).
 677     // eg. pb.renderPage('picwall')
 678     public function renderPage($page)
 679     {
 680         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 681         $this->tpl->draw($page);
 682     }
 683 }
 684
 685 // ------------------------------------------------------------------------------------------
 686 /* Data storage for links.
 687    This object behaves like an associative array.
 688    Example:
 689       $mylinks = new linkdb();
 690       echo $mylinks['20110826_161819']['title'];
 691       foreach($mylinks as $link)
 692          echo $link['title'].' at url '.$link['url'].' ; description:'.$link['description'];
 693
 694    Available keys:
 695        title : Title of the link
 696        url : URL of the link. Can be absolute or relative. Relative URLs are permalinks (eg.'?m-ukcw')
 697        description : description of the entry
 698        private : Is this link private ? 0=no, other value=yes
 699        linkdate : date of the creation of this entry, in the form YYYYMMDD_HHMMSS (eg.'20110914_192317')
 700        tags : tags attached to this entry (separated by spaces)
 701
 702    We implement 3 interfaces:
 703      - ArrayAccess so that this object behaves like an associative array.
 704      - Iterator so that this object can be used in foreach() loops.
 705      - Countable interface so that we can do a count() on this object.
 706 */
 707 class linkdb implements Iterator, Countable, ArrayAccess
 708 {
 709     private $links; // List of links (associative array. Key=linkdate (eg. "20110823_124546"), value= associative array (keys:title,description...)
 710     private $urls;  // List of all recorded URLs (key=url, value=linkdate) for fast reserve search (url-->linkdate)
 711     private $keys;  // List of linkdate keys (for the Iterator interface implementation)
 712     private $position; // Position in the $this->keys array. (for the Iterator interface implementation.)
 713     private $loggedin; // Is the used logged in ? (used to filter private links)
 714
 715     // Constructor:
 716     function __construct($isLoggedIn)
 717     // Input : $isLoggedIn : is the used logged in ?
 718     {
 719         $this->loggedin = $isLoggedIn;
 720         $this->checkdb(); // Make sure data file exists.
 721         $this->readdb();  // Then read it.
 722     }
 723
 724     // ---- Countable interface implementation
 725     public function count() { return count($this->links); }
 726
 727     // ---- ArrayAccess interface implementation
 728     public function offsetSet($offset, $value)
 729     {
 730         if (!$this->loggedin) die('You are not authorized to add a link.');
 731         if (empty($value['linkdate']) || empty($value['url'])) die('Internal Error: A link should always have a linkdate and url.');
 732         if (empty($offset)) die('You must specify a key.');
 733         $this->links[$offset] = $value;
 734         $this->urls[$value['url']]=$offset;
 735     }
 736     public function offsetExists($offset) { return array_key_exists($offset,$this->links); }
 737     public function offsetUnset($offset)
 738     {
 739         if (!$this->loggedin) die('You are not authorized to delete a link.');
 740         $url = $this->links[$offset]['url']; unset($this->urls[$url]);
 741         unset($this->links[$offset]);
 742     }
 743     public function offsetGet($offset) { return isset($this->links[$offset]) ? $this->links[$offset] : null; }
 744
 745     // ---- Iterator interface implementation
 746     function rewind() { $this->keys=array_keys($this->links); rsort($this->keys); $this->position=0; } // Start over for iteration, ordered by date (latest first).
 747     function key() { return $this->keys[$this->position]; } // current key
 748     function current() { return $this->links[$this->keys[$this->position]]; } // current value
 749     function next() { ++$this->position; } // go to next item
 750     function valid() { return isset($this->keys[$this->position]); }    // Check if current position is valid.
 751
 752     // ---- Misc methods
 753     private function checkdb() // Check if db directory and file exists.
 754     {
 755         if (!file_exists($GLOBALS['config']['DATASTORE'])) // Create a dummy database for example.
 756         {
 757              $this->links = array();
 758              $link = array('title'=>'Shaarli - sebsauvage.net','url'=>'http://sebsauvage.net/wiki/doku.php?id=php:shaarli','description'=>'Welcome to Shaarli ! This is a bookmark. To edit or delete me, you must first login.','private'=>0,'linkdate'=>'20110914_190000','tags'=>'opensource software');
 759              $this->links[$link['linkdate']] = $link;
 760              $link = array('title'=>'My secret stuff... - Pastebin.com','url'=>'http://sebsauvage.net/paste/?8434b27936c09649#bR7XsXhoTiLcqCpQbmOpBi3rq2zzQUC5hBI7ZT1O3x8=','description'=>'SShhhh!!  I\'m a private link only YOU can see. You can delete me too.','private'=>1,'linkdate'=>'20110914_074522','tags'=>'secretstuff');
 761              $this->links[$link['linkdate']] = $link;
 762              file_put_contents($GLOBALS['config']['DATASTORE'], PHPPREFIX.base64_encode(gzdeflate(serialize($this->links))).PHPSUFFIX); // Write database to disk
 763         }
 764     }
 765
 766     // Read database from disk to memory
 767     private function readdb()
 768     {
 769         // Read data
 770         $this->links=(file_exists($GLOBALS['config']['DATASTORE']) ? unserialize(gzinflate(base64_decode(substr(file_get_contents($GLOBALS['config']['DATASTORE']),strlen(PHPPREFIX),-strlen(PHPSUFFIX))))) : array() );
 771         // Note that gzinflate is faster than gzuncompress. See: http://www.php.net/manual/en/function.gzdeflate.php#96439
 772
 773         // If user is not logged in, filter private links.
 774         if (!$this->loggedin)
 775         {
 776             $toremove=array();
 777             foreach($this->links as $link) { if ($link['private']!=0) $toremove[]=$link['linkdate']; }
 778             foreach($toremove as $linkdate) { unset($this->links[$linkdate]); }
 779         }
 780
 781         // Keep the list of the mapping URLs-->linkdate up-to-date.
 782         $this->urls=array();
 783         foreach($this->links as $link) { $this->urls[$link['url']]=$link['linkdate']; }
 784     }
 785
 786     // Save database from memory to disk.
 787     public function savedb()
 788     {
 789         if (!$this->loggedin) die('You are not authorized to change the database.');
 790         file_put_contents($GLOBALS['config']['DATASTORE'], PHPPREFIX.base64_encode(gzdeflate(serialize($this->links))).PHPSUFFIX);
 791         invalidateCaches();
 792     }
 793
 794     // Returns the link for a given URL (if it exists). false it does not exist.
 795     public function getLinkFromUrl($url)
 796     {
 797         if (isset($this->urls[$url])) return $this->links[$this->urls[$url]];
 798         return false;
 799     }
 800
 801     // Case insentitive search among links (in url, title and description). Returns filtered list of links.
 802     // eg. print_r($mydb->filterFulltext('hollandais'));
 803     public function filterFulltext($searchterms)
 804     {
 805         // FIXME: explode(' ',$searchterms) and perform a AND search.
 806         // FIXME: accept double-quotes to search for a string "as is" ?
 807         $filtered=array();
 808         $s = strtolower($searchterms);
 809         foreach($this->links as $l)
 810         {
 811             $found=   (strpos(strtolower($l['title']),$s)!==false)
 812                    || (strpos(strtolower($l['description']),$s)!==false)
 813                    || (strpos(strtolower($l['url']),$s)!==false)
 814                    || (strpos(strtolower($l['tags']),$s)!==false);
 815             if ($found) $filtered[$l['linkdate']] = $l;
 816         }
 817         krsort($filtered);
 818         return $filtered;
 819     }
 820
 821     // Filter by tag.
 822     // You can specify one or more tags (tags can be separated by space or comma).
 823     // eg. print_r($mydb->filterTags('linux programming'));
 824     public function filterTags($tags,$casesensitive=false)
 825     {
 826         $t = str_replace(',',' ',($casesensitive?$tags:strtolower($tags)));
 827         $searchtags=explode(' ',$t);
 828         $filtered=array();
 829         foreach($this->links as $l)
 830         {
 831             $linktags = explode(' ',($casesensitive?$l['tags']:strtolower($l['tags'])));
 832             if (count(array_intersect($linktags,$searchtags)) == count($searchtags))
 833                 $filtered[$l['linkdate']] = $l;
 834         }
 835         krsort($filtered);
 836         return $filtered;
 837     }
 838
 839     // Filter by day. Day must be in the form 'YYYYMMDD' (eg. '20120125')
 840     // Sort order is: older articles first.
 841     // eg. print_r($mydb->filterDay('20120125'));
 842     public function filterDay($day)
 843     {
 844         $filtered=array();
 845         foreach($this->links as $l)
 846         {
 847             if (startsWith($l['linkdate'],$day)) $filtered[$l['linkdate']] = $l;
 848         }
 849         ksort($filtered);
 850         return $filtered;
 851     }
 852     // Filter by smallHash.
 853     // Only 1 article is returned.
 854     public function filterSmallHash($smallHash)
 855     {
 856         $filtered=array();
 857         foreach($this->links as $l)
 858         {
 859             if ($smallHash==smallHash($l['linkdate'])) // Yes, this is ugly and slow
 860             {
 861                 $filtered[$l['linkdate']] = $l;
 862                 return $filtered;
 863             }
 864         }
 865         return $filtered;
 866     }
 867
 868     // Returns the list of all tags
 869     // Output: associative array key=tags, value=0
 870     public function allTags()
 871     {
 872         $tags=array();
 873         foreach($this->links as $link)
 874             foreach(explode(' ',$link['tags']) as $tag)
 875                 if (!empty($tag)) $tags[$tag]=(empty($tags[$tag]) ? 1 : $tags[$tag]+1);
 876         arsort($tags); // Sort tags by usage (most used tag first)
 877         return $tags;
 878     }
 879
 880     // Returns the list of days containing articles (oldest first)
 881     // Output: An array containing days (in format YYYYMMDD).
 882     public function days()
 883     {
 884         $linkdays=array();
 885         foreach(array_keys($this->links) as $day)
 886         {
 887             $linkdays[substr($day,0,8)]=0;
 888         }
 889         $linkdays=array_keys($linkdays);
 890         sort($linkdays);
 891         return $linkdays;
 892     }
 893 }
 894
 895 // ------------------------------------------------------------------------------------------
 896 // Ouput the last N links in RSS 2.0 format.
 897 function showRSS()
 898 {
 899     header('Content-Type: application/rss+xml; charset=utf-8');
 900
 901     // $usepermalink : If true, use permalink instead of final link.
 902     // User just has to add 'permalink' in URL parameters. eg. http://mysite.com/shaarli/?do=rss&permalinks
 903     $usepermalinks = isset($_GET['permalinks']);
 904
 905     // Cache system
 906     $query = $_SERVER["QUERY_STRING"];
 907     $cache = new pageCache(pageUrl(),startsWith($query,'do=rss') && !isLoggedIn());
 908     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
 909
 910     // If cached was not found (or not usable), then read the database and build the response:
 911     $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if used it not logged in).
 912
 913     // Optionnaly filter the results:
 914     $linksToDisplay=array();
 915     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 916     elseif (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 917     else $linksToDisplay = $LINKSDB;
 918     $nblinksToDisplay = 50;  // Number of links to display.
 919     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 920     {
 921         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 922     }
 923
 924     $pageaddr=htmlspecialchars(indexUrl());
 925     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 926     echo '<channel><title>'.htmlspecialchars($GLOBALS['title']).'</title><link>'.$pageaddr.'</link>';
 927     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 928     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 929     {
 930         echo '<!-- PubSubHubbub Discovery -->';
 931         echo '<link rel="hub" href="'.htmlspecialchars($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 932         echo '<link rel="self" href="'.htmlspecialchars($pageaddr).'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 933         echo '<!-- End Of PubSubHubbub Discovery -->';
 934     }
 935     $i=0;
 936     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 937     while ($i<$nblinksToDisplay && $i<count($keys))
 938     {
 939         $link = $linksToDisplay[$keys[$i]];
 940         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 941         $rfc822date = linkdate2rfc822($link['linkdate']);
 942         $absurl = htmlspecialchars($link['url']);
 943         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 944         if ($usepermalinks===true)
 945             echo '<item><title>'.htmlspecialchars($link['title']).'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$guid.'</link>';
 946         else
 947             echo '<item><title>'.htmlspecialchars($link['title']).'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 948         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.htmlspecialchars($rfc822date)."</pubDate>\n";
 949         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 950         {
 951             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.htmlspecialchars($pageaddr).'">'.htmlspecialchars($tag).'</category>'."\n"; }
 952         }
 953
 954         // Add permalink in description
 955         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 956         // If user wants permalinks first, put the final link in description
 957         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 958         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 959         echo '<description><![CDATA['.nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($link['description'])))).$descriptionlink.']]></description>'."\n</item>\n";
 960         $i++;
 961     }
 962     echo '</channel></rss><!-- Cached version of '.htmlspecialchars(pageUrl()).' -->';
 963
 964     $cache->cache(ob_get_contents());
 965     ob_end_flush();
 966     exit;
 967 }
 968
 969 // ------------------------------------------------------------------------------------------
 970 // Ouput the last N links in ATOM format.
 971 function showATOM()
 972 {
 973     header('Content-Type: application/atom+xml; charset=utf-8');
 974
 975     // $usepermalink : If true, use permalink instead of final link.
 976     // User just has to add 'permalink' in URL parameters. eg. http://mysite.com/shaarli/?do=atom&permalinks
 977     $usepermalinks = isset($_GET['permalinks']);
 978
 979     // Cache system
 980     $query = $_SERVER["QUERY_STRING"];
 981     $cache = new pageCache(pageUrl(),startsWith($query,'do=atom') && !isLoggedIn());
 982     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
 983     // If cached was not found (or not usable), then read the database and build the response:
 984
 985     $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if used it not logged in).
 986
 987
 988     // Optionnaly filter the results:
 989     $linksToDisplay=array();
 990     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 991     elseif (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 992     else $linksToDisplay = $LINKSDB;
 993     $nblinksToDisplay = 50;  // Number of links to display.
 994     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 995     {
 996         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 997     }
 998
 999     $pageaddr=htmlspecialchars(indexUrl());
1000     $latestDate = '';
1001     $entries='';
1002     $i=0;
1003     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
1004     while ($i<$nblinksToDisplay && $i<count($keys))
1005     {
1006         $link = $linksToDisplay[$keys[$i]];
1007         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
1008         $iso8601date = linkdate2iso8601($link['linkdate']);
1009         $latestDate = max($latestDate,$iso8601date);
1010         $absurl = htmlspecialchars($link['url']);
1011         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
1012         $entries.='<entry><title>'.htmlspecialchars($link['title']).'</title>';
1013         if ($usepermalinks===true)
1014             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
1015         else
1016             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
1017         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.htmlspecialchars($iso8601date).'</updated>';
1018
1019         // Add permalink in description
1020         $descriptionlink = htmlspecialchars('(<a href="'.$guid.'">Permalink</a>)');
1021         // If user wants permalinks first, put the final link in description
1022         if ($usepermalinks===true) $descriptionlink = htmlspecialchars('(<a href="'.$absurl.'">Link</a>)');
1023         if (strlen($link['description'])>0) $descriptionlink = '&lt;br&gt;'.$descriptionlink;
1024
1025         $entries.='<content type="html">'.htmlspecialchars(nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($link['description']))))).$descriptionlink."</content>\n";
1026         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
1027         {
1028             foreach(explode(' ',$link['tags']) as $tag)
1029                 { $entries.='<category scheme="'.htmlspecialchars($pageaddr,ENT_QUOTES).'" term="'.htmlspecialchars($tag,ENT_QUOTES).'" />'."\n"; }
1030         }
1031         $entries.="</entry>\n";
1032         $i++;
1033     }
1034     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
1035     $feed.='<title>'.htmlspecialchars($GLOBALS['title']).'</title>';
1036     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.htmlspecialchars($latestDate).'</updated>';
1037     $feed.='<link rel="self" href="'.htmlspecialchars(serverUrl().$_SERVER["REQUEST_URI"]).'" />';
1038     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
1039     {
1040         $feed.='<!-- PubSubHubbub Discovery -->';
1041         $feed.='<link rel="hub" href="'.htmlspecialchars($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
1042         $feed.='<!-- End Of PubSubHubbub Discovery -->';
1043     }
1044     $feed.='<author><name>'.htmlspecialchars($pageaddr).'</name><uri>'.htmlspecialchars($pageaddr).'</uri></author>';
1045     $feed.='<id>'.htmlspecialchars($pageaddr).'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
1046     $feed.=$entries;
1047     $feed.='</feed><!-- Cached version of '.htmlspecialchars(pageUrl()).' -->';
1048     echo $feed;
1049
1050     $cache->cache(ob_get_contents());
1051     ob_end_flush();
1052     exit;
1053 }
1054
1055 // ------------------------------------------------------------------------------------------
1056 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
1057 // Gives the last 7 days (which have links).
1058 // This RSS feed cannot be filtered.
1059 function showDailyRSS()
1060 {
1061     // Cache system
1062     $query = $_SERVER["QUERY_STRING"];
1063     $cache = new pageCache(pageUrl(),startsWith($query,'do=dailyrss') && !isLoggedIn());
1064     $cached = $cache->cachedVersion(); if (!empty($cached)) { echo $cached; exit; }
1065     // If cached was not found (or not usable), then read the database and build the response:
1066     $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if used it not logged in).
1067
1068     /* Some Shaarlies may have very few links, so we need to look
1069        back in time (rsort()) until we have enough days ($nb_of_days).
1070     */
1071     $linkdates=array(); foreach($LINKSDB as $linkdate=>$value) { $linkdates[]=$linkdate; }
1072     rsort($linkdates);
1073     $nb_of_days=7; // We take 7 days.
1074     $today=Date('Ymd');
1075     $days=array();
1076     foreach($linkdates as $linkdate)
1077     {
1078         $day=substr($linkdate,0,8); // Extract day (without time)
1079         if (strcmp($day,$today)<0)
1080         {
1081             if (empty($days[$day])) $days[$day]=array();
1082             $days[$day][]=$linkdate;
1083         }
1084         if (count($days)>$nb_of_days) break; // Have we collected enough days ?
1085     }
1086
1087     // Build the RSS feed.
1088     header('Content-Type: application/rss+xml; charset=utf-8');
1089     $pageaddr=htmlspecialchars(indexUrl());
1090     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
1091     echo '<channel><title>Daily - '.htmlspecialchars($GLOBALS['title']).'</title><link>'.$pageaddr.'</link>';
1092     echo '<description>Daily shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n";
1093
1094     foreach($days as $day=>$linkdates) // For each day.
1095     {
1096         $daydate = utf8_encode(strftime('%A %d, %B %Y',linkdate2timestamp($day.'_000000'))); // Full text date
1097         $rfc822date = linkdate2rfc822($day.'_000000');
1098         $absurl=htmlspecialchars(indexUrl().'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
1099         echo '<item><title>'.htmlspecialchars($GLOBALS['title'].' - '.$daydate).'</title><guid>'.$absurl.'</guid><link>'.$absurl.'</link>';
1100         echo '<pubDate>'.htmlspecialchars($rfc822date)."</pubDate>";
1101
1102         // Build the HTML body of this RSS entry.
1103         $html='';
1104         $href='';
1105         $links=array();
1106         // We pre-format some fields for proper output.
1107         foreach($linkdates as $linkdate)
1108         {
1109             $l = $LINKSDB[$linkdate];
1110             $l['formatedDescription']=nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($l['description']))));
1111             $l['thumbnail'] = thumbnail($l['url']);
1112             $l['localdate']=linkdate2locale($l['linkdate']);
1113             if (startsWith($l['url'],'?')) $l['url']=indexUrl().$l['url'];  // make permalink URL absolute
1114             $links[$linkdate]=$l;
1115         }
1116         // Then build the HTML for this day:
1117         $tpl = new RainTPL;
1118         $tpl->assign('links',$links);
1119         $html = $tpl->draw('dailyrss',$return_string=true);
1120         echo "\n";
1121         echo '<description><![CDATA['.$html.']]></description>'."\n</item>\n\n";
1122
1123     }
1124     echo '</channel></rss><!-- Cached version of '.htmlspecialchars(pageUrl()).' -->';
1125
1126     $cache->cache(ob_get_contents());
1127     ob_end_flush();
1128     exit;
1129 }
1130
1131 // "Daily" page.
1132 function showDaily()
1133 {
1134     $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if used it not logged in).
1135
1136
1137     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
1138     if (isset($_GET['day'])) $day=$_GET['day'];
1139
1140     $days = $LINKSDB->days();
1141     $i = array_search($day,$days);
1142     if ($i==false) { $i=count($days)-1; $day=$days[$i]; }
1143     $previousday='';
1144     $nextday='';
1145     if ($i!==false)
1146     {
1147         if ($i>1) $previousday=$days[$i-1];
1148         if ($i<count($days)-1) $nextday=$days[$i+1];
1149     }
1150
1151     $linksToDisplay=$LINKSDB->filterDay($day);
1152     // We pre-format some fields for proper output.
1153     foreach($linksToDisplay as $key=>$link)
1154     {
1155         $taglist = explode(' ',$link['tags']);
1156         uasort($taglist, 'strcasecmp');
1157         $linksToDisplay[$key]['taglist']=$taglist;
1158         $linksToDisplay[$key]['formatedDescription']=nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($link['description']))));
1159         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
1160     }
1161
1162     /* We need to spread the articles on 3 columns.
1163        I did not want to use a javascript lib like http://masonry.desandro.com/
1164        so I manually spread entries with a simple method: I roughly evaluate the
1165        height of a div according to title and description length.
1166     */
1167     $columns=array(array(),array(),array()); // Entries to display, for each column.
1168     $fill=array(0,0,0);  // Rough estimate of columns fill.
1169     foreach($linksToDisplay as $key=>$link)
1170     {
1171         // Roughly estimate length of entry (by counting characters)
1172         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
1173         // Description: 836 characters gives roughly 342 pixel height.
1174         // This is not perfect, but it's usually ok.
1175         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
1176         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
1177         // Then put in column which is the less filled:
1178         $smallest=min($fill); // find smallest value in array.
1179         $index=array_search($smallest,$fill); // find index of this smallest value.
1180         array_push($columns[$index],$link); // Put entry in this column.
1181         $fill[$index]+=$length;
1182     }
1183     $PAGE = new pageBuilder;
1184     $PAGE->assign('linksToDisplay',$linksToDisplay);
1185     $PAGE->assign('linkcount',count($LINKSDB));
1186     $PAGE->assign('col1',$columns[0]);
1187     $PAGE->assign('col1',$columns[0]);
1188     $PAGE->assign('col2',$columns[1]);
1189     $PAGE->assign('col3',$columns[2]);
1190     $PAGE->assign('day',utf8_encode(strftime('%A %d, %B %Y',linkdate2timestamp($day.'_000000'))));
1191     $PAGE->assign('previousday',$previousday);
1192     $PAGE->assign('nextday',$nextday);
1193     $PAGE->renderPage('daily');
1194     exit;
1195 }
1196
1197
1198 // ------------------------------------------------------------------------------------------
1199 // Render HTML page (according to URL parameters and user rights)
1200 function renderPage()
1201 {
1202     $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if used it not logged in).
1203
1204     // -------- Display login form.
1205     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=login'))
1206     {
1207         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1208         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1209         $PAGE = new pageBuilder;
1210         $PAGE->assign('token',$token);
1211         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER']:''));
1212         $PAGE->renderPage('loginform');
1213         exit;
1214     }
1215     // -------- User wants to logout.
1216     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1217     {
1218         invalidateCaches();
1219         logout();
1220         header('Location: ?');
1221         exit;
1222     }
1223
1224     // -------- Picture wall
1225     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=picwall'))
1226     {
1227         // Optionnaly filter the results:
1228         $links=array();
1229         if (!empty($_GET['searchterm'])) $links = $LINKSDB->filterFulltext($_GET['searchterm']);
1230         elseif (!empty($_GET['searchtags']))   $links = $LINKSDB->filterTags(trim($_GET['searchtags']));
1231         else $links = $LINKSDB;
1232         $body='';
1233         $linksToDisplay=array();
1234
1235         // Get only links which have a thumbnail.
1236         foreach($links as $link)
1237         {
1238             $permalink='?'.htmlspecialchars(smallhash($link['linkdate']),ENT_QUOTES);
1239             $thumb=lazyThumbnail($link['url'],$permalink);
1240             if ($thumb!='') // Only output links which have a thumbnail.
1241             {
1242                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1243                 $link['permalink']=$permalink;
1244                 $linksToDisplay[]=$link; // Add to array.
1245             }
1246         }
1247         $PAGE = new pageBuilder;
1248         $PAGE->assign('linkcount',count($LINKSDB));
1249         $PAGE->assign('linksToDisplay',$linksToDisplay);
1250         $PAGE->renderPage('picwall');
1251         exit;
1252     }
1253
1254     // -------- Tag cloud
1255     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tagcloud'))
1256     {
1257         $tags= $LINKSDB->allTags();
1258         // We sort tags alphabetically, then choose a font size according to count.
1259         // First, find max value.
1260         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1261         ksort($tags);
1262         $tagList=array();
1263         foreach($tags as $key=>$value)
1264         {
1265             $tagList[$key] = array('count'=>$value,'size'=>max(40*$value/$maxcount,8));
1266         }
1267         $PAGE = new pageBuilder;
1268         $PAGE->assign('linkcount',count($LINKSDB));
1269         $PAGE->assign('tags',$tagList);
1270         $PAGE->renderPage('tagcloud');
1271         exit;
1272     }
1273
1274     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1275     if (isset($_GET['addtag']))
1276     {
1277         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1278         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1279         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1280         $params['searchtags'] = (empty($params['searchtags']) ?  trim($_GET['addtag']) : trim($params['searchtags']).' '.trim($_GET['addtag']));
1281         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1282         header('Location: ?'.http_build_query($params));
1283         exit;
1284     }
1285
1286     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1287     if (isset($_GET['removetag']))
1288     {
1289         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1290         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?'); exit; } // In case browser does not send HTTP_REFERER
1291         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1292         if (isset($params['searchtags']))
1293         {
1294             $tags = explode(' ',$params['searchtags']);
1295             $tags=array_diff($tags, array($_GET['removetag'])); // Remove value from array $tags.
1296             if (count($tags)==0) unset($params['searchtags']); else $params['searchtags'] = implode(' ',$tags);
1297             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1298         }
1299         header('Location: ?'.http_build_query($params));
1300         exit;
1301     }
1302
1303     // -------- User wants to change the number of links per page (linksperpage=...)
1304     if (isset($_GET['linksperpage']))
1305     {
1306         if (is_numeric($_GET['linksperpage'])) { $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage'])); }
1307         // Make sure the referer is from Shaarli itself.
1308         $referer = '?';
1309         if (!empty($_SERVER['HTTP_REFERER']) && strcmp(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST),$_SERVER['HTTP_HOST'])==0)
1310             $referer = $_SERVER['HTTP_REFERER'];
1311         header('Location: '.$referer);
1312         exit;
1313     }
1314
1315     // -------- User wants to see only private links (toggle)
1316     if (isset($_GET['privateonly']))
1317     {
1318         if (empty($_SESSION['privateonly']))
1319         {
1320             $_SESSION['privateonly']=1; // See only private links
1321         }
1322         else
1323         {
1324             unset($_SESSION['privateonly']); // See all links
1325         }
1326         // Make sure the referer is from Shaarli itself.
1327         $referer = '?';
1328         if (!empty($_SERVER['HTTP_REFERER']) && strcmp(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_HOST),$_SERVER['HTTP_HOST'])==0)
1329             $referer = $_SERVER['HTTP_REFERER'];
1330         header('Location: '.$referer);
1331         exit;
1332     }
1333
1334     // -------- Handle other actions allowed for non-logged in users:
1335     if (!isLoggedIn())
1336     {
1337         // User tries to post new link but is not loggedin:
1338         // Show login screen, then redirect to ?post=...
1339         if (isset($_GET['post']))
1340         {
1341             header('Location: ?do=login&post='.urlencode($_GET['post']).(!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').(!empty($_GET['source'])?'&source='.urlencode($_GET['source']):'')); // Redirect to login page, then back to post link.
1342             exit;
1343         }
1344         $PAGE = new pageBuilder;
1345         buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1346         $PAGE->renderPage('linklist');
1347         exit; // Never remove this one ! All operations below are reserved for logged in user.
1348     }
1349
1350     // -------- All other functions are reserved for the registered user:
1351
1352     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1353     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=tools'))
1354     {
1355         $PAGE = new pageBuilder;
1356         $PAGE->assign('linkcount',count($LINKSDB));
1357         $PAGE->assign('pageabsaddr',indexUrl());
1358         $PAGE->renderPage('tools');
1359         exit;
1360     }
1361
1362     // -------- User wants to change his/her password.
1363     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changepasswd'))
1364     {
1365         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1366         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1367         {
1368             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away !
1369
1370             // Make sure old password is correct.
1371             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1372             if ($oldhash!=$GLOBALS['hash']) { echo '<script language="JavaScript">alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1373             // Save new password
1374             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1375             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1376             writeConfig();
1377             echo '<script language="JavaScript">alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1378             exit;
1379         }
1380         else // show the change password form.
1381         {
1382             $PAGE = new pageBuilder;
1383             $PAGE->assign('linkcount',count($LINKSDB));
1384             $PAGE->assign('token',getToken());
1385             $PAGE->renderPage('changepassword');
1386             exit;
1387         }
1388     }
1389
1390     // -------- User wants to change configuration
1391     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=configure'))
1392     {
1393         if (!empty($_POST['title']) )
1394         {
1395             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away !
1396             $tz = 'UTC';
1397             if (!empty($_POST['continent']) && !empty($_POST['city']))
1398                 if (isTZvalid($_POST['continent'],$_POST['city']))
1399                     $tz = $_POST['continent'].'/'.$_POST['city'];
1400             $GLOBALS['timezone'] = $tz;
1401             $GLOBALS['title']=$_POST['title'];
1402             $GLOBALS['titleLink']=$_POST['titleLink'];
1403             $GLOBALS['redirector']=$_POST['redirector'];
1404             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1405             $GLOBALS['disablejquery']=!empty($_POST['disablejquery']);
1406             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1407             writeConfig();
1408             echo '<script language="JavaScript">alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1409             exit;
1410         }
1411         else // Show the configuration form.
1412         {
1413             $PAGE = new pageBuilder;
1414             $PAGE->assign('linkcount',count($LINKSDB));
1415             $PAGE->assign('token',getToken());
1416             $PAGE->assign('title',htmlspecialchars( empty($GLOBALS['title']) ? '' : $GLOBALS['title'] , ENT_QUOTES));
1417             $PAGE->assign('redirector',htmlspecialchars( empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] , ENT_QUOTES));
1418             list($timezone_form,$timezone_js) = templateTZform($GLOBALS['timezone']);
1419             $PAGE->assign('timezone_form',$timezone_form); // FIXME: put entire tz form generation in template ?
1420             $PAGE->assign('timezone_js',$timezone_js);
1421             $PAGE->renderPage('configure');
1422             exit;
1423         }
1424     }
1425
1426     // -------- User wants to rename a tag or delete it
1427     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=changetag'))
1428     {
1429         if (empty($_POST['fromtag']))
1430         {
1431             $PAGE = new pageBuilder;
1432             $PAGE->assign('linkcount',count($LINKSDB));
1433             $PAGE->assign('token',getToken());
1434             $PAGE->renderPage('changetag');
1435             exit;
1436         }
1437         if (!tokenOk($_POST['token'])) die('Wrong token.');
1438
1439         // Delete a tag:
1440         if (!empty($_POST['deletetag']) && !empty($_POST['fromtag']))
1441         {
1442             $needle=trim($_POST['fromtag']);
1443             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
1444             foreach($linksToAlter as $key=>$value)
1445             {
1446                 $tags = explode(' ',trim($value['tags']));
1447                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1448                 $value['tags']=trim(implode(' ',$tags));
1449                 $LINKSDB[$key]=$value;
1450             }
1451             $LINKSDB->savedb(); // save to disk
1452             echo '<script language="JavaScript">alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1453             exit;
1454         }
1455
1456         // Rename a tag:
1457         if (!empty($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag']))
1458         {
1459             $needle=trim($_POST['fromtag']);
1460             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
1461             foreach($linksToAlter as $key=>$value)
1462             {
1463                 $tags = explode(' ',trim($value['tags']));
1464                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Remplace tags value.
1465                 $value['tags']=trim(implode(' ',$tags));
1466                 $LINKSDB[$key]=$value;
1467             }
1468             $LINKSDB->savedb(); // save to disk
1469             echo '<script language="JavaScript">alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1470             exit;
1471         }
1472     }
1473
1474     // -------- User wants to add a link without using the bookmarklet: show form.
1475     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=addlink'))
1476     {
1477         $PAGE = new pageBuilder;
1478         $PAGE->assign('linkcount',count($LINKSDB));
1479         $PAGE->renderPage('addlink');
1480         exit;
1481     }
1482
1483     // -------- User clicked the "Save" button when editing a link: Save link to database.
1484     if (isset($_POST['save_edit']))
1485     {
1486         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away !
1487         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1488         $linkdate=$_POST['lf_linkdate'];
1489         $url = trim($_POST['lf_url']);
1490         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?'))
1491             $url = 'http://'.$url;
1492         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1493                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1494         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1495         $LINKSDB[$linkdate] = $link;
1496         $LINKSDB->savedb(); // save to disk
1497         pubsubhub();
1498
1499         // If we are called from the bookmarklet, we must close the popup:
1500         if (isset($_GET['source']) && $_GET['source']=='bookmarklet') { echo '<script language="JavaScript">self.close();</script>'; exit; }
1501         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1502         $returnurl .= '#'.smallHash($linkdate);  // Scroll to the link which has been edited.
1503         header('Location: '.$returnurl); // After saving the link, redirect to the page the user was on.
1504         exit;
1505     }
1506
1507     // -------- User clicked the "Cancel" button when editing a link.
1508     if (isset($_POST['cancel_edit']))
1509     {
1510         // If we are called from the bookmarklet, we must close the popup;
1511         if (isset($_GET['source']) && $_GET['source']=='bookmarklet') { echo '<script language="JavaScript">self.close();</script>'; exit; }
1512         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1513         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1514         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1515         exit;
1516     }
1517
1518     // -------- User clicked the "Delete" button when editing a link : Delete link from database.
1519     if (isset($_POST['delete_link']))
1520     {
1521         if (!tokenOk($_POST['token'])) die('Wrong token.');
1522         // We do not need to ask for confirmation:
1523         // - confirmation is handled by javascript
1524         // - we are protected from XSRF by the token.
1525         $linkdate=$_POST['lf_linkdate'];
1526         unset($LINKSDB[$linkdate]);
1527         $LINKSDB->savedb(); // save to disk
1528
1529         // If we are called from the bookmarklet, we must close the popup:
1530         if (isset($_GET['source']) && $_GET['source']=='bookmarklet') { echo '<script language="JavaScript">self.close();</script>'; exit; }
1531         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1532         if ($returnurl=='?') { $returnurl = (isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : '?'); }
1533         header('Location: '.$returnurl); // After deleting the link, redirect to the page the user was on.
1534         exit;
1535     }
1536
1537     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1538     if (isset($_GET['edit_link']))
1539     {
1540         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1541         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1542         $PAGE = new pageBuilder;
1543         $PAGE->assign('linkcount',count($LINKSDB));
1544         $PAGE->assign('link',$link);
1545         $PAGE->assign('link_is_new',false);
1546         $PAGE->assign('token',getToken()); // XSRF protection.
1547         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : ''));
1548         $PAGE->renderPage('editlink');
1549         exit;
1550     }
1551
1552     // -------- User want to post a new link: Display link edit form.
1553     if (isset($_GET['post']))
1554     {
1555         $url=$_GET['post'];
1556
1557         // We remove the annoying parameters added by FeedBurner and GoogleFeedProxy (?utm_source=...)
1558         $i=strpos($url,'&utm_source='); if ($i!==false) $url=substr($url,0,$i);
1559         $i=strpos($url,'?utm_source='); if ($i!==false) $url=substr($url,0,$i);
1560         $i=strpos($url,'#xtor=RSS-'); if ($i!==false) $url=substr($url,0,$i);
1561
1562         $link_is_new = false;
1563         $link = $LINKSDB->getLinkFromUrl($url); // Check if URL is not already in database (in this case, we will edit the existing link)
1564         if (!$link)
1565         {
1566             $link_is_new = true;  // This is a new link
1567             $linkdate = strval(date('Ymd_His'));
1568             $title = (empty($_GET['title']) ? '' : $_GET['title'] ); // Get title if it was provided in URL (by the bookmarklet).
1569             $description = (empty($_GET['description']) ? '' : $_GET['description']); // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1570             $tags = (empty($_GET['tags']) ? '' : $_GET['tags'] ); // Get tags if it was provided in URL
1571             $private = (!empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0); // Get private if it was provided in URL
1572             if (($url!='') && parse_url($url,PHP_URL_SCHEME)=='') $url = 'http://'.$url;
1573             // If this is an HTTP link, we try go get the page to extact the title (otherwise we will to straight to the edit form.)
1574             if (empty($title) && parse_url($url,PHP_URL_SCHEME)=='http')
1575             {
1576                 list($status,$headers,$data) = getHTTP($url,4); // Short timeout to keep the application responsive.
1577                 // FIXME: Decode charset according to specified in either 1) HTTP response headers or 2) <head> in html
1578                 if (strpos($status,'200 OK')!==false)
1579                                          {
1580                         // Look for charset in html header.
1581                                                 preg_match('#<meta .*charset=.*>#Usi', $data, $meta);
1582
1583                                                 // If found, extract encoding.
1584                                                 if (!empty($meta[0]))
1585                                                 {
1586                                                         // Get encoding specified in header.
1587                                                         preg_match('#charset="?(.*)"#si', $meta[0], $enc);
1588                                                         // If charset not found, use utf-8.
1589                                                         $html_charset = (!empty($enc[1])) ? strtolower($enc[1]) : 'utf-8';
1590                                                 }
1591                                                 else { $html_charset = 'utf-8'; }
1592
1593                                                 // Extract title
1594                                                 $title = html_extract_title($data);
1595                                                 if (!empty($title))
1596                                                 {
1597                                                         // Re-encode title in utf-8 if necessary.
1598                                                         $title = ($html_charset == 'iso-8859-1') ? utf8_encode($title) : $title;
1599                                                 }
1600                                         }
1601             }
1602             if ($url=='') $url='?'.smallHash($linkdate); // In case of empty URL, this is just a text (with a link that point to itself)
1603             $link = array('linkdate'=>$linkdate,'title'=>$title,'url'=>$url,'description'=>$description,'tags'=>$tags,'private'=>$private);
1604         }
1605
1606         $PAGE = new pageBuilder;
1607         $PAGE->assign('linkcount',count($LINKSDB));
1608         $PAGE->assign('link',$link);
1609         $PAGE->assign('link_is_new',$link_is_new);
1610         $PAGE->assign('token',getToken()); // XSRF protection.
1611         $PAGE->assign('http_referer',(isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : ''));
1612         $PAGE->renderPage('editlink');
1613         exit;
1614     }
1615
1616     // -------- Export as Netscape Bookmarks HTML file.
1617     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=export'))
1618     {
1619         if (empty($_GET['what']))
1620         {
1621             $PAGE = new pageBuilder;
1622             $PAGE->assign('linkcount',count($LINKSDB));
1623             $PAGE->renderPage('export');
1624             exit;
1625         }
1626         $exportWhat=$_GET['what'];
1627         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export ???');
1628
1629         header('Content-Type: text/html; charset=utf-8');
1630         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1631         $currentdate=date('Y/m/d H:i:s');
1632         echo <<<HTML
1633 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1634 <!-- This is an automatically generated file.
1635      It will be read and overwritten.
1636      DO NOT EDIT! -->
1637 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1638 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1639 <TITLE>Bookmarks</TITLE>
1640 <H1>Bookmarks</H1>
1641 HTML;
1642         foreach($LINKSDB as $link)
1643         {
1644             if ($exportWhat=='all' ||
1645                ($exportWhat=='private' && $link['private']!=0) ||
1646                ($exportWhat=='public' && $link['private']==0))
1647             {
1648                 echo '<DT><A HREF="'.htmlspecialchars($link['url']).'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1649                 if ($link['tags']!='') echo ' TAGS="'.htmlspecialchars(str_replace(' ',',',$link['tags'])).'"';
1650                 echo '>'.htmlspecialchars($link['title'])."</A>\n";
1651                 if ($link['description']!='') echo '<DD>'.htmlspecialchars($link['description'])."\n";
1652             }
1653         }
1654                 exit;
1655     }
1656
1657     // -------- User is uploading a file for import
1658     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1659     {
1660         // If file is too big, some form field may be missing.
1661         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1662         {
1663             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1664             echo '<script language="JavaScript">alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.htmlspecialchars($returnurl).'\';</script>';
1665             exit;
1666         }
1667         if (!tokenOk($_POST['token'])) die('Wrong token.');
1668         importFile();
1669         exit;
1670     }
1671
1672     // -------- Show upload/import dialog:
1673     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=import'))
1674     {
1675         $PAGE = new pageBuilder;
1676         $PAGE->assign('linkcount',count($LINKSDB));
1677         $PAGE->assign('token',getToken());
1678         $PAGE->assign('maxfilesize',getMaxFileSize());
1679         $PAGE->renderPage('import');
1680         exit;
1681     }
1682
1683     // -------- Otherwise, simply display search form and links:
1684     $PAGE = new pageBuilder;
1685     $PAGE->assign('linkcount',count($LINKSDB));
1686     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1687     $PAGE->renderPage('linklist');
1688     exit;
1689 }
1690
1691 // -----------------------------------------------------------------------------------------------
1692 // Process the import file form.
1693 function importFile()
1694 {
1695     if (!(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'])) { die('Not allowed.'); }
1696     $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if used it not logged in).
1697     $filename=$_FILES['filetoupload']['name'];
1698     $filesize=$_FILES['filetoupload']['size'];
1699     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1700     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private ?
1701     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones ?
1702     $import_count=0;
1703
1704     // Sniff file type:
1705     $type='unknown';
1706     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1707
1708     // Then import the bookmarks.
1709     if ($type=='netscape')
1710     {
1711         // This is a standard Netscape-style bookmark file.
1712         // This format is supported by all browsers (except IE, of course), also delicious, diigo and others.
1713         foreach(explode('<DT>',$data) as $html) // explode is very fast
1714         {
1715             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1716             $d = explode('<DD>',$html);
1717             if (startswith($d[0],'<A '))
1718             {
1719                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1720                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1721                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1722                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1723                 $raw_add_date=0;
1724                 foreach($matches as $m)
1725                 {
1726                     $attr=$m[1]; $value=$m[2];
1727                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1728                     elseif ($attr=='ADD_DATE')
1729                     {
1730                         $raw_add_date=intval($value);
1731                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1732                     }
1733                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1734                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1735                 }
1736                 if ($link['url']!='')
1737                 {
1738                     if ($private==1) $link['private']=1;
1739                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1740                     if ($dblink==false)
1741                     {  // Link not in database, let's import it...
1742                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1743
1744                        // Make sure date/time is not already used by another link.
1745                        // (Some bookmark files have several different links with the same ADD_DATE)
1746                        // We increment date by 1 second until we find a date which is not used in db.
1747                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1748                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1749                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1750                        $LINKSDB[$link['linkdate']] = $link;
1751                        $import_count++;
1752                     }
1753                     else // link already present in database.
1754                     {
1755                         if ($overwrite)
1756                         {   // If overwrite is required, we import link data, except date/time.
1757                             $link['linkdate']=$dblink['linkdate'];
1758                             $LINKSDB[$link['linkdate']] = $link;
1759                             $import_count++;
1760                         }
1761                     }
1762
1763                 }
1764             }
1765         }
1766         $LINKSDB->savedb();
1767
1768         echo '<script language="JavaScript">alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1769     }
1770     else
1771     {
1772         echo '<script language="JavaScript">alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1773     }
1774 }
1775
1776 // -----------------------------------------------------------------------------------------------
1777 // Template for the list of links (<div id="linklist">)
1778 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1779 function buildLinkList($PAGE,$LINKSDB)
1780 {
1781     // ---- Filter link database according to parameters
1782     $linksToDisplay=array();
1783     $search_type='';
1784     $search_crits='';
1785     if (isset($_GET['searchterm'])) // Fulltext search
1786     {
1787         $linksToDisplay = $LINKSDB->filterFulltext(trim($_GET['searchterm']));
1788         $search_crits=htmlspecialchars(trim($_GET['searchterm']));
1789         $search_type='fulltext';
1790     }
1791     elseif (isset($_GET['searchtags'])) // Search by tag
1792     {
1793         $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
1794         $search_crits=explode(' ',trim($_GET['searchtags']));
1795         $search_type='tags';
1796     }
1797     elseif (isset($_SERVER['QUERY_STRING']) && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/',$_SERVER['QUERY_STRING'])) // Detect smallHashes in URL
1798     {
1799         $linksToDisplay = $LINKSDB->filterSmallHash(substr(trim($_SERVER["QUERY_STRING"], '/'),0,6));
1800         if (count($linksToDisplay)==0)
1801         {
1802             header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
1803             echo '<h1>404 Not found.</h1>Oh crap. The link you are trying to reach does not exist or has been deleted.';
1804             echo '<br>You would mind <a href="?">clicking here</a> ?';
1805             exit;
1806         }
1807         $search_type='permalink';
1808     }
1809     else
1810         $linksToDisplay = $LINKSDB;  // otherwise, display without filtering.
1811
1812     // Option: Show only private links
1813     if (!empty($_SESSION['privateonly']))
1814     {
1815         $tmp = array();
1816         foreach($linksToDisplay as $linkdate=>$link)
1817         {
1818             if ($link['private']!=0) $tmp[$linkdate]=$link;
1819         }
1820         $linksToDisplay=$tmp;
1821     }
1822
1823     // ---- Handle paging.
1824     /* Can someone explain to me why you get the following error when using array_keys() on an object which implements the interface ArrayAccess ???
1825        "Warning: array_keys() expects parameter 1 to be array, object given in ... "
1826        If my class implements ArrayAccess, why won't array_keys() accept it ?  ( $keys=array_keys($linksToDisplay); )
1827     */
1828     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; } // Stupid and ugly. Thanks php.
1829
1830     // If there is only a single link, we change on-the-fly the title of the page.
1831     if (count($linksToDisplay)==1) $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1832
1833     // Select articles according to paging.
1834     $pagecount = ceil(count($keys)/$_SESSION['LINKS_PER_PAGE']);
1835     $pagecount = ($pagecount==0 ? 1 : $pagecount);
1836     $page=( empty($_GET['page']) ? 1 : intval($_GET['page']));
1837     $page = ( $page<1 ? 1 : $page );
1838     $page = ( $page>$pagecount ? $pagecount : $page );
1839     $i = ($page-1)*$_SESSION['LINKS_PER_PAGE']; // Start index.
1840     $end = $i+$_SESSION['LINKS_PER_PAGE'];
1841     $linkDisp=array(); // Links to display
1842     while ($i<$end && $i<count($keys))
1843     {
1844         $link = $linksToDisplay[$keys[$i]];
1845         $link['description']=nl2br(keepMultipleSpaces(text2clickable(htmlspecialchars($link['description']))));
1846         $title=$link['title'];
1847         $classLi =  $i%2!=0 ? '' : 'publicLinkHightLight';
1848         $link['class'] = ($link['private']==0 ? $classLi : 'private');
1849         $link['localdate']=linkdate2locale($link['linkdate']);
1850         $taglist = explode(' ',$link['tags']);
1851         uasort($taglist, 'strcasecmp');
1852         $link['taglist']=$taglist;
1853         $linkDisp[$keys[$i]] = $link;
1854         $i++;
1855     }
1856
1857     // Compute paging navigation
1858     $searchterm= ( empty($_GET['searchterm']) ? '' : '&searchterm='.$_GET['searchterm'] );
1859     $searchtags= ( empty($_GET['searchtags']) ? '' : '&searchtags='.$_GET['searchtags'] );
1860     $paging='';
1861     $previous_page_url=''; if ($i!=count($keys)) $previous_page_url='?page='.($page+1).$searchterm.$searchtags;
1862     $next_page_url='';if ($page>1) $next_page_url='?page='.($page-1).$searchterm.$searchtags;
1863
1864     $token = ''; if (isLoggedIn()) $token=getToken();
1865
1866     // Fill all template fields.
1867     $PAGE->assign('linkcount',count($LINKSDB));
1868     $PAGE->assign('previous_page_url',$previous_page_url);
1869     $PAGE->assign('next_page_url',$next_page_url);
1870     $PAGE->assign('page_current',$page);
1871     $PAGE->assign('page_max',$pagecount);
1872     $PAGE->assign('result_count',count($linksToDisplay));
1873     $PAGE->assign('search_type',$search_type);
1874     $PAGE->assign('search_crits',$search_crits);
1875     $PAGE->assign('redirector',empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector']); // optional redirector URL
1876     $PAGE->assign('token',$token);
1877     $PAGE->assign('links',$linkDisp);
1878     return;
1879 }
1880
1881 // Compute the thumbnail for a link.
1882 //
1883 // with a link to the original URL.
1884 // Understands various services (youtube.com...)
1885 // Input: $url = url for which the thumbnail must be found.
1886 //        $href = if provided, this URL will be followed instead of $url
1887 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1888 // Some of them may be missing.
1889 // Return an empty array if no thumbnail available.
1890 function computeThumbnail($url,$href=false)
1891 {
1892     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
1893     if ($href==false) $href=$url;
1894
1895     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1896     // (eg. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1897     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1898     $domain = parse_url($url,PHP_URL_HOST);
1899     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1900     {
1901         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1902         if (!empty($params['v'])) return array('src'=>'http://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1903                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1904     }
1905     if ($domain=='youtu.be') // Youtube short links
1906     {
1907         $path = parse_url($url,PHP_URL_PATH);
1908         return array('src'=>'http://img.youtube.com/vi'.$path.'/default.jpg',
1909                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1910     }
1911     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1912     {
1913         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1914         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1915                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1916     }
1917
1918     if ($domain=='imgur.com')
1919     {
1920         $path = parse_url($url,PHP_URL_PATH);
1921         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1922         if (startsWith($path,'/r/')) return array('src'=>'http://i.imgur.com/'.basename($path).'s.jpg',
1923                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1924         if (startsWith($path,'/gallery/')) return array('src'=>'http://i.imgur.com'.substr($path,8).'s.jpg',
1925                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1926
1927         if (substr_count($path,'/')==1) return array('src'=>'http://i.imgur.com/'.substr($path,1).'s.jpg',
1928                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1929     }
1930     if ($domain=='i.imgur.com')
1931     {
1932         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1933         if (!empty($pi['filename'])) return array('src'=>'http://i.imgur.com/'.$pi['filename'].'s.jpg',
1934                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1935     }
1936     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1937     {
1938         if (strpos($url,'dailymotion.com/video/')!==false)
1939         {
1940             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1941             return array('src'=>$thumburl,
1942                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1943         }
1944     }
1945     if (endsWith($domain,'.imageshack.us'))
1946     {
1947         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1948         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1949         {
1950             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1951             return array('src'=>$thumburl,
1952                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1953         }
1954     }
1955
1956     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1957     // So we deport the thumbnail generation in order not to slow down page generation
1958     // (and we also cache the thumbnail)
1959
1960     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1961
1962     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1963         || $domain=='vimeo.com'
1964         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1965         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1966     )
1967     {
1968         if ($domain=='vimeo.com')
1969         {   // Make sure this vimeo url points to a video (/xxx... where xxx is numeric)
1970             $path = parse_url($url,PHP_URL_PATH);
1971             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1972         }
1973         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
1974         {   // Make sure this url points to a single comic (/xxx... where xxx is numeric)
1975             $path = parse_url($url,PHP_URL_PATH);
1976             if (!preg_match('!/\d+.+?!',$path)) return array();
1977         }
1978         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
1979         {   // Make sure this TED url points to a video (/talks/...)
1980             $path = parse_url($url,PHP_URL_PATH);
1981             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
1982         }
1983         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1984         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.htmlspecialchars($sign).'&url='.urlencode($url),
1985                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1986     }
1987
1988     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1989     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1990     // But using the extension will do.
1991     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1992     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1993     {
1994         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1995         return array('src'=>indexUrl().'?do=genthumbnail&hmac='.htmlspecialchars($sign).'&url='.urlencode($url),
1996                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1997     }
1998     return array(); // No thumbnail.
1999
2000 }
2001
2002
2003 // Returns the HTML code to display a thumbnail for a link
2004 // with a link to the original URL.
2005 // Understands various services (youtube.com...)
2006 // Input: $url = url for which the thumbnail must be found.
2007 //        $href = if provided, this URL will be followed instead of $url
2008 // Returns '' if no thumbnail available.
2009 function thumbnail($url,$href=false)
2010 {
2011     $t = computeThumbnail($url,$href);
2012     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2013
2014     $html='<a href="'.htmlspecialchars($t['href']).'"><img src="'.htmlspecialchars($t['src']).'"';
2015     if (!empty($t['width']))  $html.=' width="'.htmlspecialchars($t['width']).'"';
2016     if (!empty($t['height'])) $html.=' height="'.htmlspecialchars($t['height']).'"';
2017     if (!empty($t['style']))  $html.=' style="'.htmlspecialchars($t['style']).'"';
2018     if (!empty($t['alt']))    $html.=' alt="'.htmlspecialchars($t['alt']).'"';
2019     $html.='></a>';
2020     return $html;
2021 }
2022
2023
2024 // Returns the HTML code to display a thumbnail for a link
2025 // for the picture wall (using lazy image loading)
2026 // Understands various services (youtube.com...)
2027 // Input: $url = url for which the thumbnail must be found.
2028 //        $href = if provided, this URL will be followed instead of $url
2029 // Returns '' if no thumbnail available.
2030 function lazyThumbnail($url,$href=false)
2031 {
2032     $t = computeThumbnail($url,$href);
2033     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2034
2035     $html='<a href="'.htmlspecialchars($t['href']).'">';
2036
2037     // Lazy image (only loaded by javascript when in the viewport).
2038     if (!empty($GLOBALS['disablejquery'])) // (except if jQuery is disabled)
2039         $html.='<img class="lazyimage" src="'.htmlspecialchars($t['src']).'"';
2040     else
2041         $html.='<img class="lazyimage" src="#" data-original="'.htmlspecialchars($t['src']).'"';
2042
2043     if (!empty($t['width']))  $html.=' width="'.htmlspecialchars($t['width']).'"';
2044     if (!empty($t['height'])) $html.=' height="'.htmlspecialchars($t['height']).'"';
2045     if (!empty($t['style']))  $html.=' style="'.htmlspecialchars($t['style']).'"';
2046     if (!empty($t['alt']))    $html.=' alt="'.htmlspecialchars($t['alt']).'"';
2047     $html.='>';
2048
2049     // No-javascript fallback.
2050     $html.='<noscript><img src="'.htmlspecialchars($t['src']).'"';
2051     if (!empty($t['width']))  $html.=' width="'.htmlspecialchars($t['width']).'"';
2052     if (!empty($t['height'])) $html.=' height="'.htmlspecialchars($t['height']).'"';
2053     if (!empty($t['style']))  $html.=' style="'.htmlspecialchars($t['style']).'"';
2054     if (!empty($t['alt']))    $html.=' alt="'.htmlspecialchars($t['alt']).'"';
2055     $html.='></noscript></a>';
2056
2057     return $html;
2058 }
2059
2060
2061 // -----------------------------------------------------------------------------------------------
2062 // Installation
2063 // This function should NEVER be called if the file data/config.php exists.
2064 function install()
2065 {
2066     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2067     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2068
2069
2070     // This part makes sure sessions works correctly.
2071     // (Because on some hosts, session.save_path may not be set correctly,
2072     // or we may not have write access to it.)
2073     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2074     {   // Step 2: Check if data in session is correct.
2075         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2076         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2077         echo 'It currently points to '.session_save_path().'<br><br><a href="?">Click to try again.</a></pre>';
2078         die;
2079     }
2080     if (!isset($_SESSION['session_tested']))
2081     {   // Step 1 : Try to store data in session and reload page.
2082         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2083         header('Location: '.indexUrl().'?test_session');  // Redirect to check stored data.
2084     }
2085     if (isset($_GET['test_session']))
2086     {   // Step 3: Sessions are ok. Remove test parameter from URL.
2087         header('Location: '.indexUrl());
2088     }
2089
2090
2091     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2092     {
2093         $tz = 'UTC';
2094         if (!empty($_POST['continent']) && !empty($_POST['city']))
2095             if (isTZvalid($_POST['continent'],$_POST['city']))
2096                 $tz = $_POST['continent'].'/'.$_POST['city'];
2097         $GLOBALS['timezone'] = $tz;
2098         // Everything is ok, let's create config file.
2099         $GLOBALS['login'] = $_POST['setlogin'];
2100         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2101         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2102         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.htmlspecialchars(indexUrl()) : $_POST['title'] );
2103         writeConfig();
2104         echo '<script language="JavaScript">alert("Shaarli is now configured. Please enter your login/password and start shaaring your links !");document.location=\'?do=login\';</script>';
2105         exit;
2106     }
2107
2108     // Display config form:
2109     list($timezone_form,$timezone_js) = templateTZform();
2110     $timezone_html=''; if ($timezone_form!='') $timezone_html='<tr><td valign="top"><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2111
2112     $PAGE = new pageBuilder;
2113     $PAGE->assign('timezone_html',$timezone_html);
2114     $PAGE->assign('timezone_js',$timezone_js);
2115     $PAGE->renderPage('install');
2116     exit;
2117 }
2118
2119 // Generates the timezone selection form and javascript.
2120 // Input: (optional) current timezone (can be 'UTC/UTC'). It will be pre-selected.
2121 // Output: array(html,js)
2122 // Example: list($htmlform,$js) = templateTZform('Europe/Paris');  // Europe/Paris pre-selected.
2123 // Returns array('','') if server does not support timezones list. (eg. php 5.1 on free.fr)
2124 function templateTZform($ptz=false)
2125 {
2126     if (function_exists('timezone_identifiers_list')) // because of old php version (5.1) which can be found on free.fr
2127     {
2128         // Try to split the provided timezone.
2129         if ($ptz==false) { $l=timezone_identifiers_list(); $ptz=$l[0]; }
2130         $spos=strpos($ptz,'/'); $pcontinent=substr($ptz,0,$spos); $pcity=substr($ptz,$spos+1);
2131
2132         // Display config form:
2133         $timezone_form = '';
2134         $timezone_js = '';
2135         // The list is in the forme "Europe/Paris", "America/Argentina/Buenos_Aires"...
2136         // We split the list in continents/cities.
2137         $continents = array();
2138         $cities = array();
2139         foreach(timezone_identifiers_list() as $tz)
2140         {
2141             if ($tz=='UTC') $tz='UTC/UTC';
2142             $spos = strpos($tz,'/');
2143             if ($spos!==false)
2144             {
2145                 $continent=substr($tz,0,$spos); $city=substr($tz,$spos+1);
2146                 $continents[$continent]=1;
2147                 if (!isset($cities[$continent])) $cities[$continent]='';
2148                 $cities[$continent].='<option value="'.$city.'"'.($pcity==$city?'selected':'').'>'.$city.'</option>';
2149             }
2150         }
2151         $continents_html = '';
2152         $continents = array_keys($continents);
2153         foreach($continents as $continent)
2154             $continents_html.='<option  value="'.$continent.'"'.($pcontinent==$continent?'selected':'').'>'.$continent.'</option>';
2155         $cities_html = $cities[$pcontinent];
2156         $timezone_form = "Continent: <select name=\"continent\" id=\"continent\" onChange=\"onChangecontinent();\">${continents_html}</select>";
2157         $timezone_form .= "&nbsp;&nbsp;&nbsp;&nbsp;City: <select name=\"city\" id=\"city\">${cities[$pcontinent]}</select><br />";
2158         $timezone_js = "<script language=\"JavaScript\">";
2159         $timezone_js .= "function onChangecontinent(){document.getElementById(\"city\").innerHTML = citiescontinent[document.getElementById(\"continent\").value];}";
2160         $timezone_js .= "var citiescontinent = ".json_encode($cities).";" ;
2161         $timezone_js .= "</script>" ;
2162         return array($timezone_form,$timezone_js);
2163     }
2164     return array('','');
2165 }
2166
2167 // Tells if a timezone is valid or not.
2168 // If not valid, returns false.
2169 // If system does not support timezone list, returns false.
2170 function isTZvalid($continent,$city)
2171 {
2172     $tz = $continent.'/'.$city;
2173     if (function_exists('timezone_identifiers_list')) // because of old php version (5.1) which can be found on free.fr
2174     {
2175         if (in_array($tz, timezone_identifiers_list())) // it's a valid timezone ?
2176                     return true;
2177     }
2178     return false;
2179 }
2180 if (!function_exists('json_encode')) {
2181     function json_encode($data) {
2182         switch ($type = gettype($data)) {
2183             case 'NULL':
2184                 return 'null';
2185             case 'boolean':
2186                 return ($data ? 'true' : 'false');
2187             case 'integer':
2188             case 'double':
2189             case 'float':
2190                 return $data;
2191             case 'string':
2192                 return '"' . addslashes($data) . '"';
2193             case 'object':
2194                 $data = get_object_vars($data);
2195             case 'array':
2196                 $output_index_count = 0;
2197                 $output_indexed = array();
2198                 $output_associative = array();
2199                 foreach ($data as $key => $value) {
2200                     $output_indexed[] = json_encode($value);
2201                     $output_associative[] = json_encode($key) . ':' . json_encode($value);
2202                     if ($output_index_count !== NULL && $output_index_count++ !== $key) {
2203                         $output_index_count = NULL;
2204                     }
2205                 }
2206                 if ($output_index_count !== NULL) {
2207                     return '[' . implode(',', $output_indexed) . ']';
2208                 } else {
2209                     return '{' . implode(',', $output_associative) . '}';
2210                 }
2211             default:
2212                 return ''; // Not supported
2213         }
2214     }
2215 }
2216
2217 // Webservices (for use with jQuery/jQueryUI)
2218 // eg.  index.php?ws=tags&term=minecr
2219 function processWS()
2220 {
2221     if (empty($_GET['ws']) || empty($_GET['term'])) return;
2222     $term = $_GET['term'];
2223     $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if used it not logged in).
2224     header('Content-Type: application/json; charset=utf-8');
2225
2226     // Search in tags (case insentitive, cumulative search)
2227     if ($_GET['ws']=='tags')
2228     {
2229         $tags=explode(' ',str_replace(',',' ',$term)); $last = array_pop($tags); // Get the last term ("a b c d" ==> "a b c", "d")
2230         $addtags=''; if ($tags) $addtags=implode(' ',$tags).' '; // We will pre-pend previous tags
2231         $suggested=array();
2232         /* To speed up things, we store list of tags in session */
2233         if (empty($_SESSION['tags'])) $_SESSION['tags'] = $LINKSDB->allTags();
2234         foreach($_SESSION['tags'] as $key=>$value)
2235         {
2236             if (startsWith($key,$last,$case=false) && !in_array($key,$tags)) $suggested[$addtags.$key.' ']=0;
2237         }
2238         echo json_encode(array_keys($suggested));
2239         exit;
2240     }
2241
2242     // Search a single tag (case sentitive, single tag search)
2243     if ($_GET['ws']=='singletag')
2244     {
2245         /* To speed up things, we store list of tags in session */
2246         if (empty($_SESSION['tags'])) $_SESSION['tags'] = $LINKSDB->allTags();
2247         foreach($_SESSION['tags'] as $key=>$value)
2248         {
2249             if (startsWith($key,$term,$case=true)) $suggested[$key]=0;
2250         }
2251         echo json_encode(array_keys($suggested));
2252         exit;
2253     }
2254 }
2255
2256 // Re-write configuration file according to globals.
2257 // Requires some $GLOBALS to be set (login,hash,salt,title).
2258 // If the config file cannot be saved, an error message is dislayed and the user is redirected to "Tools" menu.
2259 // (otherwise, the function simply returns.)
2260 function writeConfig()
2261 {
2262     if (is_file($GLOBALS['config']['CONFIG_FILE']) && !isLoggedIn()) die('You are not authorized to alter config.'); // Only logged in user can alter config.
2263     $config='<?php $GLOBALS[\'login\']='.var_export($GLOBALS['login'],true).'; $GLOBALS[\'hash\']='.var_export($GLOBALS['hash'],true).'; $GLOBALS[\'salt\']='.var_export($GLOBALS['salt'],true).'; ';
2264     $config .='$GLOBALS[\'timezone\']='.var_export($GLOBALS['timezone'],true).'; date_default_timezone_set('.var_export($GLOBALS['timezone'],true).'); $GLOBALS[\'title\']='.var_export($GLOBALS['title'],true).';';
2265     $config .= '$GLOBALS[\'titleLink\']='.var_export($GLOBALS['titleLink'],true).'; ';
2266     $config .= '$GLOBALS[\'redirector\']='.var_export($GLOBALS['redirector'],true).'; ';
2267     $config .= '$GLOBALS[\'disablesessionprotection\']='.var_export($GLOBALS['disablesessionprotection'],true).'; ';
2268     $config .= '$GLOBALS[\'disablejquery\']='.var_export($GLOBALS['disablejquery'],true).'; ';
2269     $config .= '$GLOBALS[\'privateLinkByDefault\']='.var_export($GLOBALS['privateLinkByDefault'],true).'; ';
2270     $config .= ' ?>';
2271     if (!file_put_contents($GLOBALS['config']['CONFIG_FILE'],$config) || strcmp(file_get_contents($GLOBALS['config']['CONFIG_FILE']),$config)!=0)
2272     {
2273         echo '<script language="JavaScript">alert("Shaarli could not create the config file. Please make sure Shaarli has the right to write in the folder is it installed in.");document.location=\'?\';</script>';
2274         exit;
2275     }
2276 }
2277
2278 /* Because some f*cking services like Flickr require an extra HTTP request to get the thumbnail URL,
2279    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2280    The following function takes the URL a link (eg. a flickr page) and return the proper thumbnail.
2281    This function is called by passing the url:
2282    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2283    [URL] is the URL of the link (eg. a flickr page)
2284    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2285    The function below will fetch the image from the webservice and store it in the cache.
2286 */
2287 function genThumbnail()
2288 {
2289     // Make sure the parameters in the URL were generated by us.
2290     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2291     if ($sign!=$_GET['hmac']) die('Naughty boy !');
2292
2293     // Let's see if we don't already have the image for this URL in the cache.
2294     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2295     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2296     {   // We have the thumbnail, just serve it:
2297         header('Content-Type: image/jpeg');
2298         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2299         return;
2300     }
2301     // We may also serve a blank image (if service did not respond)
2302     $blankname=hash('sha1',$_GET['url']).'.gif';
2303     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2304     {
2305         header('Content-Type: image/gif');
2306         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2307         return;
2308     }
2309
2310     // Otherwise, generate the thumbnail.
2311     $url = $_GET['url'];
2312     $domain = parse_url($url,PHP_URL_HOST);
2313
2314     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2315     {
2316         // Crude replacement to handle new Flickr domain policy (They prefer www. now)
2317         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2318
2319         // Is this a link to an image, or to a flickr page ?
2320         $imageurl='';
2321         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2322         {  // This is a direct link to an image. eg. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2323             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2324             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2325         }
2326         else // this is a flickr page (html)
2327         {
2328             list($httpstatus,$headers,$data) = getHTTP($url,20); // Get the flickr html page.
2329             if (strpos($httpstatus,'200 OK')!==false)
2330             {
2331                 // Flickr now nicely provides the URL of the thumbnail in each flickr page.
2332                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!',$data,$matches);
2333                 if (!empty($matches[1])) $imageurl=$matches[1];
2334
2335                 // In albums (and some other pages), the link rel="image_src" is not provided,
2336                 // but flickr provides:
2337                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2338                 if ($imageurl=='')
2339                 {
2340                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!',$data,$matches);
2341                     if (!empty($matches[1])) $imageurl=$matches[1];
2342                 }
2343             }
2344         }
2345
2346         if ($imageurl!='')
2347         {   // Let's download the image.
2348             list($httpstatus,$headers,$data) = getHTTP($imageurl,10); // Image is 240x120, so 10 seconds to download should be enough.
2349             if (strpos($httpstatus,'200 OK')!==false)
2350             {
2351                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2352                 header('Content-Type: image/jpeg');
2353                 echo $data;
2354                 return;
2355             }
2356         }
2357     }
2358
2359     elseif ($domain=='vimeo.com' )
2360     {
2361         // This is more complex: we have to perform a HTTP request, then parse the result.
2362         // Maybe we should deport this to javascript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2363         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2364         list($httpstatus,$headers,$data) = getHTTP('http://vimeo.com/api/v2/video/'.htmlspecialchars($vid).'.php',5);
2365         if (strpos($httpstatus,'200 OK')!==false)
2366         {
2367             $t = unserialize($data);
2368             $imageurl = $t[0]['thumbnail_medium'];
2369             // Then we download the image and serve it to our client.
2370             list($httpstatus,$headers,$data) = getHTTP($imageurl,10);
2371             if (strpos($httpstatus,'200 OK')!==false)
2372             {
2373                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2374                 header('Content-Type: image/jpeg');
2375                 echo $data;
2376                 return;
2377             }
2378         }
2379     }
2380
2381     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2382     {
2383         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2384         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2385         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2386         list($httpstatus,$headers,$data) = getHTTP($url,5);
2387         if (strpos($httpstatus,'200 OK')!==false)
2388         {
2389             // Extract the link to the thumbnail
2390             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!',$data,$matches);
2391             if (!empty($matches[1]))
2392             {   // Let's download the image.
2393                 $imageurl=$matches[1];
2394                 list($httpstatus,$headers,$data) = getHTTP($imageurl,20); // No control on image size, so wait long enough.
2395                 if (strpos($httpstatus,'200 OK')!==false)
2396                 {
2397                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2398                     file_put_contents($filepath,$data); // Save image to cache.
2399                     if (resizeImage($filepath))
2400                     {
2401                         header('Content-Type: image/jpeg');
2402                         echo file_get_contents($filepath);
2403                         return;
2404                     }
2405                 }
2406             }
2407         }
2408     }
2409
2410     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2411     {
2412         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2413         // http://xkcd.com/327/
2414         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2415         list($httpstatus,$headers,$data) = getHTTP($url,5);
2416         if (strpos($httpstatus,'200 OK')!==false)
2417         {
2418             // Extract the link to the thumbnail
2419             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!',$data,$matches);
2420             if (!empty($matches[1]))
2421             {   // Let's download the image.
2422                 $imageurl=$matches[1];
2423                 list($httpstatus,$headers,$data) = getHTTP($imageurl,20); // No control on image size, so wait long enough.
2424                 if (strpos($httpstatus,'200 OK')!==false)
2425                 {
2426                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2427                     file_put_contents($filepath,$data); // Save image to cache.
2428                     if (resizeImage($filepath))
2429                     {
2430                         header('Content-Type: image/jpeg');
2431                         echo file_get_contents($filepath);
2432                         return;
2433                     }
2434                 }
2435             }
2436         }
2437     }
2438
2439     else
2440     {
2441         // For all other domains, we try to download the image and make a thumbnail.
2442         list($httpstatus,$headers,$data) = getHTTP($url,30);  // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2443         if (strpos($httpstatus,'200 OK')!==false)
2444         {
2445             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2446             file_put_contents($filepath,$data); // Save image to cache.
2447             if (resizeImage($filepath))
2448             {
2449                 header('Content-Type: image/jpeg');
2450                 echo file_get_contents($filepath);
2451                 return;
2452             }
2453         }
2454     }
2455
2456
2457     // Otherwise, return an empty image (8x8 transparent gif)
2458     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2459     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2460     header('Content-Type: image/gif');
2461     echo $blankgif;
2462 }
2463
2464 // Make a thumbnail of the image (to width: 120 pixels)
2465 // Returns true if success, false otherwise.
2466 function resizeImage($filepath)
2467 {
2468     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2469
2470     // Trick: some stupid people rename GIF as JPEG... or else.
2471     // So we really try to open each image type whatever the extension is.
2472     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2473     $im=false;
2474     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2475     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2476     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2477     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2478     $w = imagesx($im);
2479     $h = imagesy($im);
2480     $ystart = 0; $yheight=$h;
2481     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2482     $nw = 120;   // Desired width
2483     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2484     // Resize image:
2485     $im2 = imagecreatetruecolor($nw,$nh);
2486     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2487     imageinterlace($im2,true); // For progressive JPEG.
2488     $tempname=$filepath.'_TEMP.jpg';
2489     imagejpeg($im2, $tempname, 90);
2490     imagedestroy($im);
2491     imagedestroy($im2);
2492     unlink($filepath);
2493     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2494     return true;
2495 }
2496
2497 // Invalidate caches when the database is changed or the user logs out.
2498 // (eg. tags cache).
2499 function invalidateCaches()
2500 {
2501     unset($_SESSION['tags']);  // Purge cache attached to session.
2502     pageCache::purgeCache();   // Purge page cache shared by sessions.
2503 }
2504
2505 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2506 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2507 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2508 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2509 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=daily')) { showDaily(); exit; }
2510 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'ws=')) { processWS(); exit; } // Webservices (for jQuery/jQueryUI)
2511 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2512 renderPage();
2513 ?>