index.php

   1 <?php
   2 // Shaarli 0.0.18 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
   7 // Requires: php 5.1.x
   8
   9 // -----------------------------------------------------------------------------------------------
  10 // User config:
  11 define('DATADIR','data'); // Data subdirectory
  12 define('CONFIG_FILE',DATADIR.'/config.php'); // Configuration file (user login/password)
  13 define('DATASTORE',DATADIR.'/datastore.php'); // Data storage file.
  14 define('LINKS_PER_PAGE',20); // Default links per page.
  15 define('IPBANS_FILENAME',DATADIR.'/ipbans.php'); // File storage for failures and bans.
  16 define('BAN_AFTER',4);       // Ban IP after this many failures.
  17 define('BAN_DURATION',1800); // Ban duration for IP address after login failures (in seconds) (1800 sec. = 30 minutes)
  18 define('OPEN_SHAARLI',false); // If true, anyone can add/edit/delete links without having to login
  19 define('HIDE_TIMESTAMPS',false); // If true, the moment when links were saved are not shown to users that are not logged in.
  20
  21 // -----------------------------------------------------------------------------------------------
  22 // Program config (touch at your own risks !)
  23 define('UPDATECHECK_FILENAME',DATADIR.'/lastupdatecheck.txt'); // For updates check of Shaarli.
  24 define('UPDATECHECK_INTERVAL',86400); // Updates check frequency for Shaarli. 86400 seconds=24 hours
  25 ini_set('max_input_time','60');  // High execution time in case of problematic imports/exports.
  26 ini_set('memory_limit', '128M');  // Try to set max upload file size and read (May not work on some hosts).
  27 ini_set('post_max_size', '16M');
  28 ini_set('upload_max_filesize', '16M');
  29 define('PHPPREFIX','<?php /* '); // Prefix to encapsulate data in php code.
  30 define('PHPSUFFIX',' */ ?>'); // Suffix to encapsulate data in php code.
  31 $STARTTIME = microtime(true);  // Measure page execution time.
  32 checkphpversion();
  33 error_reporting(E_ALL^E_WARNING);  // See all error except warnings.
  34 //error_reporting(-1); // See all errors (for debugging only)
  35 ob_start();
  36
  37 // In case stupid admin has left magic_quotes enabled in php.ini:
  38 if (get_magic_quotes_gpc())
  39 {
  40     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
  41     $_POST = array_map('stripslashes_deep', $_POST);
  42     $_GET = array_map('stripslashes_deep', $_GET);
  43     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
  44 }
  45 // Prevent caching: (yes, it's ugly)
  46 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
  47 header("Cache-Control: no-store, no-cache, must-revalidate");
  48 header("Cache-Control: post-check=0, pre-check=0", false);
  49 header("Pragma: no-cache");
  50 define('shaarli_version','0.0.18 beta');
  51 if (!is_dir(DATADIR)) { mkdir(DATADIR,0705); chmod(DATADIR,0705); }
  52 if (!is_file(DATADIR.'/.htaccess')) { file_put_contents(DATADIR.'/.htaccess',"Allow from none\nDeny from all\n"); } // Protect data files.
  53 if (!is_file(CONFIG_FILE)) install();
  54 require CONFIG_FILE;  // Read login/password hash into $GLOBALS.
  55 // Small protection against dodgy config files:
  56 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.htmlspecialchars(serverUrl().$_SERVER['SCRIPT_NAME']);
  57 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
  58 autoLocale(); // Sniff browser language and set date format accordingly.
  59 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
  60 $LINKSDB=false;
  61
  62 // Check php version
  63 function checkphpversion()
  64 {
  65     if (version_compare(PHP_VERSION, '5.1.0') < 0)
  66     {
  67         header('Content-Type: text/plain; charset=utf-8');
  68         echo 'Your server supports php '.PHP_VERSION.'. Shaarli requires at last php 5.1.0, and thus cannot run. Sorry.';
  69         exit;
  70     }
  71 }
  72
  73 // Checks if an update is available for Shaarli.
  74 // (at most once a day, and only for registered user.)
  75 // Output: '' = no new version.
  76 //         other= the available version.
  77 function checkUpdate()
  78 {
  79     if (!isLoggedIn()) return ''; // Do not check versions for visitors.
  80
  81     // Get latest version number at most once a day.
  82     if (!is_file(UPDATECHECK_FILENAME) || (filemtime(UPDATECHECK_FILENAME)<time()-(UPDATECHECK_INTERVAL)))
  83     {
  84         $version=shaarli_version;
  85         list($httpstatus,$headers,$data) = getHTTP('http://sebsauvage.net/files/shaarli_version.txt',2);
  86         if (strpos($httpstatus,'200 OK')) $version=$data;
  87         // If failed, nevermind. We don't want to bother the user with that.
  88         file_put_contents(UPDATECHECK_FILENAME,$version); // touch file date
  89     }
  90     // Compare versions:
  91     $newestversion=file_get_contents(UPDATECHECK_FILENAME);
  92     if ($newestversion!=shaarli_version) return $newestversion;
  93     return '';
  94 }
  95
  96 // -----------------------------------------------------------------------------------------------
  97 // Log to text file
  98 function logm($message)
  99 {
 100     $t = strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n";
 101     file_put_contents(DATADIR.'/log.txt',$t,FILE_APPEND);
 102 }
 103
 104 // ------------------------------------------------------------------------------------------
 105 // Sniff browser language to display dates in the right format automatically.
 106 // (Note that is may not work on your server if the corresponding local is not installed.)
 107 function autoLocale()
 108 {
 109     $loc='en_US'; // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 110     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // eg. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 111     {   // (It's a bit crude, but it works very well. Prefered language is always presented first.)
 112         if (preg_match('/([a-z]{2}(-[a-z]{2})?)/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) $loc=$matches[1];
 113     }
 114     setlocale(LC_TIME,$loc);  // LC_TIME = Set local for date/time format only.
 115 }
 116
 117 // ------------------------------------------------------------------------------------------
 118 // Session management
 119 define('INACTIVITY_TIMEOUT',3600); // (in seconds). If the user does not access any page within this time, his/her session is considered expired.
 120 ini_set('session.use_cookies', 1);       // Use cookies to store session.
 121 ini_set('session.use_only_cookies', 1);  // Force cookies for session (phpsessionID forbidden in URL)
 122 ini_set('session.use_trans_sid', false); // Prevent php to use sessionID in URL if cookies are disabled.
 123 session_name('shaarli');
 124 session_start();
 125
 126 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 127 function allIPs()
 128 {
 129     $ip = $_SERVER["REMOTE_ADDR"];
 130     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 131     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 132     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 133     return $ip;
 134 }
 135
 136 // Check that user/password is correct.
 137 function check_auth($login,$password)
 138 {
 139     $hash = sha1($password.$login.$GLOBALS['salt']);
 140     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 141     {   // Login/password is correct.
 142         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // generate unique random number (different than phpsessionid)
 143         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 144         $_SESSION['username']=$login;
 145         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 146         logm('Login successful');
 147         return True;
 148     }
 149     logm('Login failed for user '.$login);
 150     return False;
 151 }
 152
 153 // Returns true if the user is logged in.
 154 function isLoggedIn()
 155 {
 156     if (OPEN_SHAARLI) return true;
 157
 158     // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 159     if (empty($_SESSION['uid']) || $_SESSION['ip']!=allIPs() || time()>=$_SESSION['expires_on'])
 160     {
 161         logout();
 162         return false;
 163     }
 164     $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // User accessed a page : Update his/her session expiration date.
 165     return true;
 166 }
 167
 168 // Force logout.
 169 function logout() { if (isset($_SESSION)) { unset($_SESSION['uid']); unset($_SESSION['ip']); unset($_SESSION['username']);}  }
 170
 171
 172 // ------------------------------------------------------------------------------------------
 173 // Brute force protection system
 174 // Several consecutive failed logins will ban the IP address for 30 minutes.
 175 if (!is_file(IPBANS_FILENAME)) file_put_contents(IPBANS_FILENAME, "<?php\n\$GLOBALS['IPBANS']=".var_export(array('FAILURES'=>array(),'BANS'=>array()),true).";\n?>");
 176 include IPBANS_FILENAME;
 177 // Signal a failed login. Will ban the IP if too many failures:
 178 function ban_loginFailed()
 179 {
 180     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 181     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 182     $gb['FAILURES'][$ip]++;
 183     if ($gb['FAILURES'][$ip]>(BAN_AFTER-1))
 184     {
 185         $gb['BANS'][$ip]=time()+BAN_DURATION;
 186         logm('IP address banned from login');
 187     }
 188     $GLOBALS['IPBANS'] = $gb;
 189     file_put_contents(IPBANS_FILENAME, "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 190 }
 191
 192 // Signals a successful login. Resets failed login counter.
 193 function ban_loginOk()
 194 {
 195     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 196     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 197     $GLOBALS['IPBANS'] = $gb;
 198     file_put_contents(IPBANS_FILENAME, "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 199 }
 200
 201 // Checks if the user CAN login. If 'true', the user can try to login.
 202 function ban_canLogin()
 203 {
 204     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 205     if (isset($gb['BANS'][$ip]))
 206     {
 207         // User is banned. Check if the ban has expired:
 208         if ($gb['BANS'][$ip]<=time())
 209         {   // Ban expired, user can try to login again.
 210             logm('Ban lifted.');
 211             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 212             file_put_contents(IPBANS_FILENAME, "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 213             return true; // Ban has expired, user can login.
 214         }
 215         return false; // User is banned.
 216     }
 217     return true; // User is not banned.
 218 }
 219
 220 // ------------------------------------------------------------------------------------------
 221 // Process login form: Check if login/password is correct.
 222 if (isset($_POST['login']))
 223 {
 224     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 225     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 226     {   // Login/password is ok.
 227         ban_loginOk();
 228         // Optional redirect after login:
 229         if (isset($_GET['post'])) { header('Location: ?post='.urlencode($_GET['post']).(!empty($_GET['source'])?'&source='.urlencode($_GET['source']):'')); exit; }
 230         if (isset($_POST['returnurl']))
 231         {
 232             if (endsWith($_POST['returnurl'],'?do=login')) { header('Location: ?'); exit; } // Prevent loops over login screen.
 233             header('Location: '.$_POST['returnurl']); exit;
 234         }
 235         header('Location: ?'); exit;
 236     }
 237     else
 238     {
 239         ban_loginFailed();
 240         echo '<script language="JavaScript">alert("Wrong login/password.");document.location=\'?do=login\';</script>'; // Redirect to login screen.
 241         exit;
 242     }
 243 }
 244
 245 // ------------------------------------------------------------------------------------------
 246 // Misc utility functions:
 247
 248 // Returns the server URL (including port and http/https), without path.
 249 // eg. "http://myserver.com:8080"
 250 // You can append $_SERVER['SCRIPT_NAME'] to get the current script URL.
 251 function serverUrl()
 252 {
 253         $serverport = ($_SERVER["SERVER_PORT"]!='80' ? ':'.$_SERVER["SERVER_PORT"] : '');
 254         return 'http'.(!empty($_SERVER['HTTPS'])?'s':'').'://'.$_SERVER["SERVER_NAME"].$serverport;
 255 }
 256
 257 // Convert post_max_size/upload_max_filesize (eg.'16M') parameters to bytes.
 258 function return_bytes($val)
 259 {
 260     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 261     switch($last)
 262     {
 263         case 'g': $val *= 1024;
 264         case 'm': $val *= 1024;
 265         case 'k': $val *= 1024;
 266     }
 267     return $val;
 268 }
 269
 270 // Try to determine max file size for uploads (POST).
 271 // Returns an integer (in bytes)
 272 function getMaxFileSize()
 273 {
 274     $size1 = return_bytes(ini_get('post_max_size'));
 275     $size2 = return_bytes(ini_get('upload_max_filesize'));
 276     // Return the smaller of two:
 277     $maxsize = min($size1,$size2);
 278     // FIXME: Then convert back to readable notations ? (eg. 2M instead of 2000000)
 279     return $maxsize;
 280 }
 281
 282 // Tells if a string start with a substring or not.
 283 function startsWith($haystack,$needle,$case=true)
 284 {
 285     if($case){return (strcmp(substr($haystack, 0, strlen($needle)),$needle)===0);}
 286     return (strcasecmp(substr($haystack, 0, strlen($needle)),$needle)===0);
 287 }
 288
 289 // Tells if a string ends with a substring or not.
 290 function endsWith($haystack,$needle,$case=true)
 291 {
 292     if($case){return (strcmp(substr($haystack, strlen($haystack) - strlen($needle)),$needle)===0);}
 293     return (strcasecmp(substr($haystack, strlen($haystack) - strlen($needle)),$needle)===0);
 294 }
 295
 296 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 297     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 298     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 299 function linkdate2timestamp($linkdate)
 300 {
 301     $Y=$M=$D=$h=$m=$s=0;
 302     $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 303     return mktime($h,$m,$s,$M,$D,$Y);
 304 }
 305
 306 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 307     (used to build the pubDate attribute in RSS feed.)  */
 308 function linkdate2rfc822($linkdate)
 309 {
 310     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 311 }
 312
 313 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a localized date format.
 314     (used to display link date on screen)
 315     The date format is automatically chosen according to locale/languages sniffed from browser headers (see autoLocale()). */
 316 function linkdate2locale($linkdate)
 317 {
 318     return utf8_encode(strftime('%c',linkdate2timestamp($linkdate))); // %c is for automatic date format according to locale.
 319     // Note that if you use a local which is not installed on your webserver,
 320     // the date will not be displayed in the chosen locale, but probably in US notation.
 321 }
 322
 323 // Parse HTTP response headers and return an associative array.
 324 function http_parse_headers( $headers )
 325 {
 326     $res=array();
 327     foreach($headers as $header)
 328     {
 329         $i = strpos($header,': ');
 330         if ($i)
 331         {
 332             $key=substr($header,0,$i);
 333             $value=substr($header,$i+2,strlen($header)-$i-2);
 334             $res[$key]=$value;
 335         }
 336     }
 337     return $res;
 338 }
 339
 340 /* GET an URL.
 341    Input: $url : url to get (http://...)
 342           $timeout : Network timeout (will wait this many seconds for an anwser before giving up).
 343    Output: An array.  [0] = HTTP status message (eg. "HTTP/1.1 200 OK") or error message
 344                       [1] = associative array containing HTTP response headers (eg. echo getHTTP($url)[1]['Content-Type'])
 345                       [2] = data
 346     Example: list($httpstatus,$headers,$data) = getHTTP('http://sebauvage.net/');
 347              if (strpos($httpstatus,'200 OK'))
 348                  echo 'Data type: '.htmlspecialchars($headers['Content-Type']);
 349              else
 350                  echo 'There was an error: '.htmlspecialchars($httpstatus)
 351 */
 352 function getHTTP($url,$timeout=30)
 353 {
 354     try
 355     {
 356         $options = array('http'=>array('method'=>'GET','timeout' => $timeout)); // Force network timeout
 357         $context = stream_context_create($options);
 358         $data=file_get_contents($url,false,$context,-1, 2000000); // We download at most 2 Mb from source.
 359         if (!$data) { $lasterror=error_get_last();  return array($lasterror['message'],array(),''); }
 360         $httpStatus=$http_response_header[0]; // eg. "HTTP/1.1 200 OK"
 361         $responseHeaders=http_parse_headers($http_response_header);
 362         return array($httpStatus,$responseHeaders,$data);
 363     }
 364     catch (Exception $e)  // getHTTP *can* fail silentely (we don't care if the title cannot be fetched)
 365     {
 366         return array($e->getMessage(),'','');
 367     }
 368 }
 369
 370 // Extract title from an HTML document.
 371 // (Returns an empty string if not found.)
 372 function html_extract_title($html)
 373 {
 374   return preg_match('!<title>(.*?)</title>!i', $html, $matches) ? $matches[1] : '';
 375 }
 376
 377 // ------------------------------------------------------------------------------------------
 378 // Token management for XSRF protection
 379 // Token should be used in any form which acts on data (create,update,delete,import...).
 380 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 381
 382 // Returns a token.
 383 function getToken()
 384 {
 385     $rnd = sha1(uniqid('',true).'_'.mt_rand());  // We generate a random string.
 386     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 387     return $rnd;
 388 }
 389
 390 // Tells if a token is ok. Using this function will destroy the token.
 391 // true=token is ok.
 392 function tokenOk($token)
 393 {
 394     if (isset($_SESSION['tokens'][$token]))
 395     {
 396         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 397         return true; // Token is ok.
 398     }
 399     return false; // Wrong token, or already used.
 400 }
 401
 402 // ------------------------------------------------------------------------------------------
 403 /* Data storage for links.
 404    This object behaves like an associative array.
 405    Example:
 406       $mylinks = new linkdb();
 407       echo $mylinks['20110826_161819']['title'];
 408       foreach($mylinks as $link)
 409          echo $link['title'].' at url '.$link['url'].' ; description:'.$link['description'];
 410
 411    We implement 3 interfaces:
 412      - ArrayAccess so that this object behaves like an associative array.
 413      - Iterator so that this object can be used in foreach() loops.
 414      - Countable interface so that we can do a count() on this object.
 415 */
 416 class linkdb implements Iterator, Countable, ArrayAccess
 417
 418 {
 419     private $links; // List of links (associative array. Key=linkdate (eg. "20110823_124546"), value= associative array (keys:title,description...)
 420     private $urls;  // List of all recorded URLs (key=url, value=linkdate) for fast reserve search (url-->linkdate)
 421     private $keys;  // List of linkdate keys (for the Iterator interface implementation)
 422     private $position; // Position in the $this->keys array. (for the Iterator interface implementation.)
 423     private $loggedin; // Is the used logged in ? (used to filter private links)
 424
 425     // Constructor:
 426     function __construct($isLoggedIn)
 427     // Input : $isLoggedIn : is the used logged in ?
 428     {
 429         $this->loggedin = $isLoggedIn;
 430         $this->checkdb(); // Make sure data file exists.
 431         $this->readdb();  // Then read it.
 432     }
 433
 434     // ---- Countable interface implementation
 435     public function count() { return count($this->links); }
 436
 437     // ---- ArrayAccess interface implementation
 438     public function offsetSet($offset, $value)
 439     {
 440         if (!$this->loggedin) die('You are not authorized to add a link.');
 441         if (empty($value['linkdate']) || empty($value['url'])) die('Internal Error: A link should always have a linkdate and url.');
 442         if (empty($offset)) die('You must specify a key.');
 443         $this->links[$offset] = $value;
 444         $this->urls[$value['url']]=$offset;
 445     }
 446     public function offsetExists($offset) { return array_key_exists($offset,$this->links); }
 447     public function offsetUnset($offset)
 448     {
 449         if (!$this->loggedin) die('You are not authorized to delete a link.');
 450         $url = $this->links[$offset]['url']; unset($this->urls[$url]);
 451         unset($this->links[$offset]);
 452     }
 453     public function offsetGet($offset) { return isset($this->links[$offset]) ? $this->links[$offset] : null; }
 454
 455     // ---- Iterator interface implementation
 456     function rewind() { $this->keys=array_keys($this->links); rsort($this->keys); $this->position=0; } // Start over for iteration, ordered by date (latest first).
 457     function key() { return $this->keys[$this->position]; } // current key
 458     function current() { return $this->links[$this->keys[$this->position]]; } // current value
 459     function next() { ++$this->position; } // go to next item
 460     function valid() { return isset($this->keys[$this->position]); }    // Check if current position is valid.
 461
 462     // ---- Misc methods
 463     private function checkdb() // Check if db directory and file exists.
 464     {
 465         if (!file_exists(DATASTORE)) // Create a dummy database for example.
 466         {
 467              $this->links = array();
 468              $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');
 469              $this->links[$link['linkdate']] = $link;
 470              $link = array('title'=>'My secret stuff... - Pastebin.com','url'=>'http://pastebin.com/smCEEeSn','description'=>'SShhhh!!  I\'m a private link only YOU can see. You can delete me too.','private'=>1,'linkdate'=>'20110914_074522','tags'=>'secretstuff');
 471              $this->links[$link['linkdate']] = $link;
 472              file_put_contents(DATASTORE, PHPPREFIX.base64_encode(gzdeflate(serialize($this->links))).PHPSUFFIX); // Write database to disk
 473         }
 474     }
 475
 476     // Read database from disk to memory
 477     private function readdb()
 478     {
 479         // Read data
 480         $this->links=(file_exists(DATASTORE) ? unserialize(gzinflate(base64_decode(substr(file_get_contents(DATASTORE),strlen(PHPPREFIX),-strlen(PHPSUFFIX))))) : array() );
 481         // Note that gzinflate is faster than gzuncompress. See: http://www.php.net/manual/en/function.gzdeflate.php#96439
 482
 483         // If user is not logged in, filter private links.
 484         if (!$this->loggedin)
 485         {
 486             $toremove=array();
 487             foreach($this->links as $link) { if ($link['private']!=0) $toremove[]=$link['linkdate']; }
 488             foreach($toremove as $linkdate) { unset($this->links[$linkdate]); }
 489         }
 490
 491         // Keep the list of the mapping URLs-->linkdate up-to-date.
 492         $this->urls=array();
 493         foreach($this->links as $link) { $this->urls[$link['url']]=$link['linkdate']; }
 494     }
 495
 496     // Save database from memory to disk.
 497     public function savedb()
 498     {
 499         if (!$this->loggedin) die('You are not authorized to change the database.');
 500         file_put_contents(DATASTORE, PHPPREFIX.base64_encode(gzdeflate(serialize($this->links))).PHPSUFFIX);
 501     }
 502
 503     // Returns the link for a given URL (if it exists). false it does not exist.
 504     public function getLinkFromUrl($url)
 505     {
 506         if (isset($this->urls[$url])) return $this->links[$this->urls[$url]];
 507         return false;
 508     }
 509
 510     // Case insentitive search among links (in url, title and description). Returns filtered list of links.
 511     // eg. print_r($mydb->filterFulltext('hollandais'));
 512     public function filterFulltext($searchterms)
 513     {
 514         // FIXME: explode(' ',$searchterms) and perform a AND search.
 515         // FIXME: accept double-quotes to search for a string "as is" ?
 516         $filtered=array();
 517         $s = strtolower($searchterms);
 518         foreach($this->links as $l)
 519         {
 520             $found=strpos(strtolower($l['title']),$s) || strpos(strtolower($l['description']),$s) || strpos(strtolower($l['url']),$s) || strpos(strtolower($l['tags']),$s);
 521             if ($found) $filtered[$l['linkdate']] = $l;
 522         }
 523         krsort($filtered);
 524         return $filtered;
 525     }
 526
 527     // Filter by tag.
 528     // You can specify one or more tags (tags can be separated by space or comma).
 529     // eg. print_r($mydb->filterTags('linux programming'));
 530     public function filterTags($tags,$casesensitive=false)
 531     {
 532         $t = str_replace(',',' ',($casesensitive?$tags:strtolower($tags)));
 533         $searchtags=explode(' ',$t);
 534         $filtered=array();
 535         foreach($this->links as $l)
 536         {
 537             $linktags = explode(' ',($casesensitive?$l['tags']:strtolower($l['tags'])));
 538             if (count(array_intersect($linktags,$searchtags)) == count($searchtags))
 539                 $filtered[$l['linkdate']] = $l;
 540         }
 541         krsort($filtered);
 542         return $filtered;
 543     }
 544
 545     // Returns the list of all tags
 546     // Output: associative array key=tags, value=0
 547     public function allTags()
 548     {
 549         $tags=array();
 550         foreach($this->links as $link)
 551             foreach(explode(' ',$link['tags']) as $tag)
 552                 if (!empty($tag)) $tags[$tag]=(empty($tags[$tag]) ? 1 : $tags[$tag]+1);
 553         arsort($tags); // Sort tags by usage (most used tag first)
 554         return $tags;
 555     }
 556 }
 557
 558 // ------------------------------------------------------------------------------------------
 559 // Ouput the last 50 links in RSS 2.0 format.
 560 function showRSS()
 561 {
 562     global $LINKSDB;
 563
 564     // Optionnaly filter the results:
 565     $linksToDisplay=array();
 566     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 567     elseif (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 568     else $linksToDisplay = $LINKSDB;
 569
 570     header('Content-Type: application/xhtml+xml; charset=utf-8');
 571     $pageaddr=htmlspecialchars(serverUrl().$_SERVER["SCRIPT_NAME"]);
 572     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 573     echo '<channel><title>'.htmlspecialchars($GLOBALS['title']).'</title><link>'.$pageaddr.'</link>';
 574     echo '<description>Shared links</description><language></language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 575     $i=0;
 576     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 577     while ($i<50 && $i<count($keys))
 578     {
 579         $link = $linksToDisplay[$keys[$i]];
 580         $rfc822date = linkdate2rfc822($link['linkdate']);
 581         echo '<item><title>'.htmlspecialchars($link['title']).'</title><guid>'.htmlspecialchars($link['url']).'</guid><link>'.htmlspecialchars($link['url']).'</link>';
 582         if (!HIDE_TIMESTAMPS || isLoggedIn()) echo '<pubDate>'.htmlspecialchars($rfc822date).'</pubDate>';
 583         echo '<description><![CDATA['.nl2br(htmlspecialchars($link['description'])).']]></description></item>'."\n";
 584         $i++;
 585     }
 586     echo '</channel></rss>';
 587     exit;
 588 }
 589
 590 // ------------------------------------------------------------------------------------------
 591 // Render HTML page:
 592 function renderPage()
 593 {
 594     global $STARTTIME;
 595     global $LINKSDB;
 596
 597     // Well... rendering the page would be 100x better with the excellent Smarty, but I don't want to tie this minimalist project to 100+ files.
 598     // So I use a custom templating system.
 599
 600     // -------- Display login form.
 601     if (startswith($_SERVER["QUERY_STRING"],'do=login'))
 602     {
 603         if (OPEN_SHAARLI) { header('Location: ?'); exit; }  // No need to login for open Shaarli
 604         if (!ban_canLogin())
 605         {
 606             $loginform='<div id="headerform">You have been banned from login after too many failed attempts. Try later.</div>';
 607             $data = array('pageheader'=>$loginform,'body'=>'','onload'=>'');
 608             templatePage($data);
 609             exit;
 610         }
 611         $returnurl_html = (isset($_SERVER['HTTP_REFERER']) ? '<input type="hidden" name="returnurl" value="'.htmlspecialchars($_SERVER['HTTP_REFERER']).'">' : '');
 612         $loginform='<div id="headerform"><form method="post" name="loginform">Login: <input type="text" name="login">&nbsp;&nbsp;&nbsp;Password : <input type="password" name="password"> <input type="submit" value="Login" class="bigbutton"><input type="hidden" name="token" value="'.getToken().'">'.$returnurl_html.'</form></div>';
 613         $onload = 'onload="document.loginform.login.focus();"';
 614         $data = array('pageheader'=>$loginform,'body'=>'','onload'=>$onload);
 615         templatePage($data);
 616         exit;
 617     }
 618
 619     // -------- User wants to logout.
 620     if (startswith($_SERVER["QUERY_STRING"],'do=logout'))
 621     {
 622         invalidateCaches();
 623         logout();
 624         header('Location: ?');
 625         exit;
 626     }
 627
 628     // -------- Tag cloud
 629     if (startswith($_SERVER["QUERY_STRING"],'do=tagcloud'))
 630     {
 631         $tags= $LINKSDB->allTags();
 632         // We sort tags alphabetically, then choose a font size according to count.
 633         // First, find max value.
 634         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
 635         ksort($tags);
 636         $cloud='';
 637         foreach($tags as $key=>$value)
 638         {
 639             $size = max(40*$value/$maxcount,8); // Minimum size 8.
 640             $colorvalue = 128-ceil(127*$value/$maxcount);
 641             $color='rgb('.$colorvalue.','.$colorvalue.','.$colorvalue.')';
 642             $cloud.= '<span style="color:#99f; font-size:9pt; padding-left:5px; padding-right:2px;">'.$value.'</span><a href="?searchtags='.htmlspecialchars($key).'" style="font-size:'.$size.'pt; font-weight:bold; color:'.$color.';">'.htmlspecialchars($key).'</a> ';
 643         }
 644         $cloud='<div id="cloudtag">'.$cloud.'</div>';
 645         $data = array('pageheader'=>'','body'=>$cloud,'onload'=>'');
 646         templatePage($data);
 647         exit;
 648     }
 649
 650     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
 651     if (isset($_GET['addtag']))
 652     {
 653         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
 654         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
 655         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
 656         $params['searchtags'] = (empty($params['searchtags']) ?  trim($_GET['addtag']) : trim($params['searchtags']).' '.urlencode(trim($_GET['addtag'])));
 657         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
 658         header('Location: ?'.http_build_query($params));
 659         exit;
 660     }
 661
 662     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
 663     if (isset($_GET['removetag']))
 664     {
 665         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
 666         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?'); exit; } // In case browser does not send HTTP_REFERER
 667         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
 668         if (isset($params['searchtags']))
 669         {
 670             $tags = explode(' ',$params['searchtags']);
 671             $tags=array_diff($tags, array($_GET['removetag'])); // Remove value from array $tags.
 672             if (count($tags)==0) unset($params['searchtags']); else $params['searchtags'] = implode(' ',$tags);
 673             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
 674         }
 675         header('Location: ?'.http_build_query($params));
 676         exit;
 677     }
 678
 679     // -------- User wants to change the number of links per page (linksperpage=...)
 680     if (isset($_GET['linksperpage']))
 681     {
 682         if (is_numeric($_GET['linksperpage'])) { $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage'])); }
 683         header('Location: '.(empty($_SERVER['HTTP_REFERER'])?'?':$_SERVER['HTTP_REFERER']));
 684         exit;
 685     }
 686
 687
 688     // -------- Handle other actions allowed for non-logged in users:
 689     if (!isLoggedIn())
 690     {
 691         // User tries to post new link but is not loggedin:
 692         // Show login screen, then redirect to ?post=...
 693         if (isset($_GET['post']))
 694         {
 695             header('Location: ?do=login&post='.urlencode($_GET['post']).(isset($_GET['source'])?'&source='.urlencode($_GET['source']):'')); // Redirect to login page, then back to post link.
 696             exit;
 697         }
 698
 699         // Show search form and display list of links.
 700         $searchform=<<<HTML
 701 <div id="headerform" style="width:100%; white-space:nowrap;";>
 702     <form method="GET" name="searchform" style="display:inline;"><input type="text" name="searchterm" style="width:50%" value=""> <input type="submit" value="Search" class="bigbutton"></form>
 703     <form method="GET" name="tagfilter" style="display:inline;padding-left:24px;"><input type="text" name="searchtags" id="searchtags" style="width:20%" value=""> <input type="submit" value="Filter by tag" class="bigbutton"></form>
 704 </div>
 705 HTML;
 706         $onload = 'onload="document.searchform.searchterm.focus();"';
 707         $data = array('pageheader'=>$searchform,'body'=>templateLinkList(),'onload'=>$onload);
 708         templatePage($data);
 709         exit; // Never remove this one ! All operations below are reserved for logged in user.
 710     }
 711
 712     // -------- All other functions are reserved for the registered user:
 713
 714     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
 715     if (startswith($_SERVER["QUERY_STRING"],'do=tools'))
 716     {
 717         $pageabsaddr=serverUrl().$_SERVER["SCRIPT_NAME"]; // Why doesn't php have a built-in function for that ?
 718         // The javascript code for the bookmarklet:
 719         $changepwd = (OPEN_SHAARLI ? '' : '<a href="?do=changepasswd"><b>Change password</b></a> - Change your password.<br><br>' );
 720         $toolbar= <<<HTML
 721 <div id="headerform"><br>
 722     {$changepwd}
 723     <a href="?do=configure"><b>Configure your Shaarli</b></a> - Change Title, timezone...<br><br>
 724     <a href="?do=changetag"><b>Rename/delete tags</b></a> - Rename or delete a tag in all links.<br><br>
 725     <a href="?do=import"><b>Import</b></a> - Import Netscape html bookmarks (as exported from Firefox, Chrome, Opera, delicious...)<br><br>
 726     <a href="?do=export"><b>Export</b></a> - Export Netscape html bookmarks (which can be imported in Firefox, Chrome, Opera, delicious...)<br><br>
 727     <a class="smallbutton" style="color:black;" onclick="alert('Drag this link to your bookmarks toolbar, or right-click it and choose Bookmark This Link...');return false;" href="javascript:javascript:(function(){var%20url%20=%20location.href;var%20title%20=%20document.title%20||%20url;window.open('{$pageabsaddr}?post='%20+%20encodeURIComponent(url)+'&amp;title='%20+%20encodeURIComponent(title)+'&amp;source=bookmarklet','_blank','menubar=no,height=400,width=608,toolbar=no,scrollbars=no,status=no');})();">Shaare link</a> - Drag this link to your bookmarks toolbar (or right-click it and choose Bookmark This Link....). Then click "Shaare link" button in any page you want to share.<br><br>
 728 </div>
 729 HTML;
 730         $data = array('pageheader'=>$toolbar,'body'=>'','onload'=>'');
 731         templatePage($data);
 732         exit;
 733     }
 734
 735     // -------- User wants to change his/her password.
 736     if (startswith($_SERVER["QUERY_STRING"],'do=changepasswd'))
 737     {
 738         if (OPEN_SHAARLI) die('You are not supposed to change a password on an Open Shaarli.');
 739         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
 740         {
 741             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away !
 742
 743             // Make sure old password is correct.
 744             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
 745             if ($oldhash!=$GLOBALS['hash']) { echo '<script language="JavaScript">alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
 746             // Save new password
 747             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
 748             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
 749             writeConfig();
 750             echo '<script language="JavaScript">alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
 751             exit;
 752         }
 753         else
 754         {
 755             $token = getToken();
 756             $changepwdform= <<<HTML
 757 <form method="POST" action="" name="changepasswordform" style="padding:10 10 10 10;">
 758 Old password: <input type="password" name="oldpassword">&nbsp; &nbsp;
 759 New password: <input type="password" name="setpassword">
 760 <input type="hidden" name="token" value="{$token}">
 761 <input type="submit" name="Save" value="Save password" class="bigbutton"></form>
 762 HTML;
 763             $data = array('pageheader'=>$changepwdform,'body'=>'','onload'=>'onload="document.changepasswordform.oldpassword.focus();"');
 764             templatePage($data);
 765             exit;
 766         }
 767     }
 768
 769     // -------- User wants to change configuration
 770     if (startswith($_SERVER["QUERY_STRING"],'do=configure'))
 771     {
 772         if (!empty($_POST['title']) )
 773         {
 774             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away !
 775             $tz = 'UTC';
 776             if (!empty($_POST['continent']) && !empty($_POST['city']))
 777                 if (isTZvalid($_POST['continent'],$_POST['city']))
 778                     $tz = $_POST['continent'].'/'.$_POST['city'];
 779             $GLOBALS['timezone'] = $tz;
 780             $GLOBALS['title']=$_POST['title'];
 781             writeConfig();
 782             echo '<script language="JavaScript">alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
 783             exit;
 784         }
 785         else
 786         {
 787             $token = getToken();
 788             $title = htmlspecialchars( empty($GLOBALS['title']) ? '' : $GLOBALS['title'] , ENT_QUOTES);
 789             list($timezone_form,$timezone_js) = templateTZform($GLOBALS['timezone']);
 790             $timezone_html=''; if ($timezone_form!='') $timezone_html='<tr><td valign="top"><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
 791             $changepwdform= <<<HTML
 792 ${timezone_js}<form method="POST" action="" name="configform" id="configform"><input type="hidden" name="token" value="{$token}">
 793 <table border="0" cellpadding="20">
 794 <tr><td><b>Page title:</b></td><td><input type="text" name="title" id="title" size="50" value="{$title}"></td></tr>
 795 {$timezone_html}
 796 <tr><td></td><td align="right"><input type="submit" name="Save" value="Save config" class="bigbutton"></td></tr>
 797 </table>
 798 </form>
 799 HTML;
 800             $data = array('pageheader'=>$changepwdform,'body'=>'','onload'=>'onload="document.configform.title.focus();"');
 801             templatePage($data);
 802             exit;
 803         }
 804     }
 805
 806     // -------- User wants to rename a tag or delete it
 807     if (startswith($_SERVER["QUERY_STRING"],'do=changetag'))
 808     {
 809         if (empty($_POST['fromtag']))
 810         {
 811             $token = getToken();
 812             $changetagform = <<<HTML
 813 <form method="POST" action="" name="changetag" style="padding:10 10 10 10;">
 814 <input type="hidden" name="token" value="{$token}">
 815 Tag: <input type="text" name="fromtag" id="fromtag">
 816 <input type="text" name="totag" style="margin-left:40px;"><input type="submit" name="renametag" value="Rename tag" class="bigbutton">
 817 &nbsp;&nbsp;or&nbsp; <input type="submit" name="deletetag" value="Delete tag" class="bigbutton" onClick="return confirmDeleteTag();"><br>(Case sensitive)</form>
 818 <script language="JavaScript">function confirmDeleteTag() { var agree=confirm("Are you sure you want to delete this tag from all links ?"); if (agree) return true ; else return false ; }</script>
 819 HTML;
 820             $data = array('pageheader'=>$changetagform,'body'=>'','onload'=>'onload="document.changetag.fromtag.focus();"');
 821             templatePage($data);
 822             exit;
 823         }
 824         if (!tokenOk($_POST['token'])) die('Wrong token.');
 825
 826         if (!empty($_POST['deletetag']) && !empty($_POST['fromtag']))
 827         {
 828             $needle=trim($_POST['fromtag']);
 829             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
 830             foreach($linksToAlter as $key=>$value)
 831             {
 832                 $tags = explode(' ',trim($value['tags']));
 833                 unset($tags[array_search($needle,$tags)]); // Remove tag.
 834                 $value['tags']=trim(implode(' ',$tags));
 835                 $LINKSDB[$key]=$value;
 836             }
 837             $LINKSDB->savedb(); // save to disk
 838             invalidateCaches();
 839             echo '<script language="JavaScript">alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
 840             exit;
 841         }
 842
 843         // Rename a tag:
 844         if (!empty($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag']))
 845         {
 846             $needle=trim($_POST['fromtag']);
 847             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
 848             foreach($linksToAlter as $key=>$value)
 849             {
 850                 $tags = explode(' ',trim($value['tags']));
 851                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Remplace tags value.
 852                 $value['tags']=trim(implode(' ',$tags));
 853                 $LINKSDB[$key]=$value;
 854             }
 855             $LINKSDB->savedb(); // save to disk
 856             invalidateCaches();
 857             echo '<script language="JavaScript">alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
 858             exit;
 859         }
 860     }
 861
 862     // -------- User wants to add a link without using the bookmarklet: show form.
 863     if (startswith($_SERVER["QUERY_STRING"],'do=addlink'))
 864     {
 865         $onload = 'onload="document.addform.post.focus();"';
 866         $addform= '<div id="headerform"><form method="GET" action="" name="addform"><input type="text" name="post" style="width:70%;"> <input type="submit" value="Add link" class="bigbutton"></div>';
 867         $data = array('pageheader'=>$addform,'body'=>'','onload'=>$onload);
 868         templatePage($data);
 869         exit;
 870     }
 871
 872     // -------- User clicked the "Save" button when editing a link: Save link to database.
 873     if (isset($_POST['save_edit']))
 874     {
 875         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away !
 876         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
 877         $linkdate=$_POST['lf_linkdate'];
 878         $link = array('title'=>trim($_POST['lf_title']),'url'=>trim($_POST['lf_url']),'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
 879                       'linkdate'=>$linkdate,'tags'=>$tags);
 880         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
 881         $LINKSDB[$linkdate] = $link;
 882         $LINKSDB->savedb(); // save to disk
 883         invalidateCaches();
 884
 885         // If we are called from the bookmarklet, we must close the popup:
 886         if (isset($_GET['source']) && $_GET['source']=='bookmarklet') { echo '<script language="JavaScript">self.close();</script>'; exit; }
 887         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
 888         header('Location: '.$returnurl); // After saving the link, redirect to the page the user was on.
 889         exit;
 890     }
 891
 892     // -------- User clicked the "Cancel" button when editing a link.
 893     if (isset($_POST['cancel_edit']))
 894     {
 895         // If we are called from the bookmarklet, we must close the popup;
 896         if (isset($_GET['source']) && $_GET['source']=='bookmarklet') { echo '<script language="JavaScript">self.close();</script>'; exit; }
 897         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
 898         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
 899         exit;
 900     }
 901
 902     // -------- User clicked the "Delete" button when editing a link : Delete link from database.
 903     if (isset($_POST['delete_link']))
 904     {
 905         if (!tokenOk($_POST['token'])) die('Wrong token.');
 906         // We do not need to ask for confirmation:
 907         // - confirmation is handled by javascript
 908         // - we are protected from XSRF by the token.
 909         $linkdate=$_POST['lf_linkdate'];
 910         unset($LINKSDB[$linkdate]);
 911         $LINKSDB->savedb(); // save to disk
 912         invalidateCaches();
 913         // If we are called from the bookmarklet, we must close the popup:
 914         if (isset($_GET['source']) && $_GET['source']=='bookmarklet') { echo '<script language="JavaScript">self.close();</script>'; exit; }
 915         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
 916         header('Location: '.$returnurl); // After deleting the link, redirect to the page the user was on.
 917         exit;
 918     }
 919
 920     // -------- User clicked the "EDIT" button on a link: Display link edit form.
 921     if (isset($_GET['edit_link']))
 922     {
 923         $link = $LINKSDB[$_GET['edit_link']];  // Read database
 924         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
 925         list($editform,$onload)=templateEditForm($link);
 926         $data = array('pageheader'=>$editform,'body'=>'','onload'=>$onload);
 927         templatePage($data);
 928         exit;
 929     }
 930
 931     // -------- User want to post a new link: Display link edit form.
 932     if (isset($_GET['post']))
 933     {
 934         $url=$_GET['post'];
 935
 936         // We remove the annoying parameters added by FeedBurner and GoogleFeedProxy (?utm_source=...)
 937         $i=strpos($url,'&utm_source='); if ($i) $url=substr($url,0,$i);
 938         $i=strpos($url,'?utm_source='); if ($i) $url=substr($url,0,$i);
 939         $i=strpos($url,'#xtor=RSS-'); if ($i) $url=substr($url,0,$i);
 940
 941         $link_is_new = false;
 942         $link = $LINKSDB->getLinkFromUrl($url); // Check if URL is not already in database (in this case, we will edit the existing link)
 943         if (!$link)
 944         {
 945             $link_is_new = true;  // This is a new link
 946             $linkdate = strval(date('Ymd_His'));
 947             $title = (empty($_GET['title']) ? '' : $_GET['title'] ); // Get title if it was provided in URL (by the bookmarklet).
 948             $description=''; $tags=''; $private=0;
 949             if (parse_url($url,PHP_URL_SCHEME)=='') $url = 'http://'.$url;
 950             // 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.)
 951             if (empty($title) && parse_url($url,PHP_URL_SCHEME)=='http')
 952             {
 953                 list($status,$headers,$data) = getHTTP($url,4); // Short timeout to keep the application responsive.
 954                 // FIXME: Decode charset according to specified in either 1) HTTP response headers or 2) <head> in html
 955                 if (strpos($status,'200 OK')) $title=html_entity_decode(html_extract_title($data),ENT_QUOTES,'UTF-8');
 956             }
 957             $link = array('linkdate'=>$linkdate,'title'=>$title,'url'=>$url,'description'=>$description,'tags'=>$tags,'private'=>0);
 958         }
 959         list($editform,$onload)=templateEditForm($link,$link_is_new);
 960         $data = array('pageheader'=>$editform,'body'=>'','onload'=>$onload);
 961         templatePage($data);
 962         exit;
 963     }
 964
 965     // -------- Export as Netscape Bookmarks HTML file.
 966     if (startswith($_SERVER["QUERY_STRING"],'do=export'))
 967     {
 968         if (empty($_GET['what']))
 969         {
 970             $toolbar= <<<HTML
 971 <div id="headerform"><br>
 972     <a href="?do=export&what=all"><b>Export all</b></a> - Export all links<br><br>
 973     <a href="?do=export&what=public"><b>Export public</b></a> - Export public links only<br><br>
 974     <a href="?do=export&what=private"><b>Export private</b></a> - Export private links only<br><br>
 975 </div>
 976 HTML;
 977             $data = array('pageheader'=>$toolbar,'body'=>'','onload'=>'');
 978             templatePage($data);
 979             exit;
 980         }
 981         $exportWhat=$_GET['what'];
 982         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export ???');
 983
 984         header('Content-Type: text/html; charset=utf-8');
 985         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
 986         echo <<<HTML
 987 <!DOCTYPE NETSCAPE-Bookmark-file-1>
 988 <!-- This is an automatically generated file.
 989      It will be read and overwritten.
 990      DO NOT EDIT! -->
 991 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
 992 <TITLE>Bookmarks</TITLE>
 993 <H1>Bookmarks</H1>
 994 HTML;
 995         foreach($LINKSDB as $link)
 996         {
 997             if ($exportWhat=='all' ||
 998                ($exportWhat=='private' && $link['private']!=0) ||
 999                ($exportWhat=='public' && $link['private']==0))
1000             {
1001                 echo '<DT><A HREF="'.htmlspecialchars($link['url']).'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1002                 if ($link['tags']!='') echo ' TAGS="'.htmlspecialchars(str_replace(' ',',',$link['tags'])).'"';
1003                 echo '>'.htmlspecialchars($link['title'])."</A>\n";
1004                 if ($link['description']!='') echo '<DD>'.htmlspecialchars($link['description'])."\n";
1005             }
1006         }
1007         echo '<!-- Shaarli '.$exportWhat.' bookmarks export on '.date('Y/m/d H:i:s')."-->\n";
1008         exit;
1009     }
1010
1011     // -------- User is uploading a file for import
1012     if (startswith($_SERVER["QUERY_STRING"],'do=upload'))
1013     {
1014         // If file is too big, some form field may be missing.
1015         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1016         {
1017             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1018             echo '<script language="JavaScript">alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.htmlspecialchars($returnurl).'\';</script>';
1019             exit;
1020         }
1021         if (!tokenOk($_POST['token'])) die('Wrong token.');
1022         importFile();
1023         exit;
1024     }
1025
1026     // -------- Show upload/import dialog:
1027     if (startswith($_SERVER["QUERY_STRING"],'do=import'))
1028     {
1029         $token = getToken();
1030         $maxfilesize=getMaxFileSize();
1031         $onload = 'onload="document.uploadform.filetoupload.focus();"';
1032         $uploadform=<<<HTML
1033 <div id="headerform">
1034 Import Netscape html bookmarks (as exported from Firefox/Chrome/Opera/delicious/diigo...) (Max: {$maxfilesize} bytes).
1035 <form method="POST" action="?do=upload" enctype="multipart/form-data" name="uploadform">
1036     <input type="hidden" name="token" value="{$token}">
1037     <input type="file" name="filetoupload" size="80">
1038     <input type="hidden" name="MAX_FILE_SIZE" value="{$maxfilesize}">
1039     <input type="submit" name="import_file" value="Import" class="bigbutton"><br>
1040     <input type="checkbox" name="private">&nbsp;Import all links as private<br>
1041     <input type="checkbox" name="overwrite">&nbsp;Overwrite existing links
1042 </form>
1043 </div>
1044 HTML;
1045         $data = array('pageheader'=>$uploadform,'body'=>'','onload'=>$onload  );
1046         templatePage($data);
1047         exit;
1048     }
1049
1050     // -------- Otherwise, simply display search form and links:
1051     $searchform=<<<HTML
1052 <div id="headerform" style="width:100%; white-space:nowrap;";>
1053     <form method="GET" name="searchform" style="display:inline;"><input type="text" name="searchterm" style="width:50%" value=""> <input type="submit" value="Search" class="bigbutton"></form>
1054     <form method="GET" name="tagfilter" style="display:inline;padding-left:24px;"><input type="text" name="searchtags" id="searchtags" style="width:20%" value=""> <input type="submit" value="Filter by tag" class="bigbutton"></form>
1055 </div>
1056 HTML;
1057     $onload = 'onload="document.searchform.searchterm.focus();"';
1058     $data = array('pageheader'=>$searchform,'body'=>templateLinkList(),'onload'=>$onload);
1059     templatePage($data);
1060     exit;
1061 }
1062
1063 // -----------------------------------------------------------------------------------------------
1064 // Process the import file form.
1065 function importFile()
1066 {
1067     global $LINKSDB;
1068     $filename=$_FILES['filetoupload']['name'];
1069     $filesize=$_FILES['filetoupload']['size'];
1070     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1071     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private ?
1072     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones ?
1073     $import_count=0;
1074
1075     // Sniff file type:
1076     $type='unknown';
1077     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1078
1079     // Then import the bookmarks.
1080     if ($type=='netscape')
1081     {
1082         // This is a standard Netscape-style bookmark file.
1083         // This format is supported by all browsers (except IE, of course), also delicious, diigo and others.
1084         // I didn't want to use DOM... anyway, this is FAST (less than 1 second to import 7200 links (2.1 Mb html file)).
1085         foreach(explode('<DT>',$data) as $html) // explode is very fast
1086         {
1087             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1088             $d = explode('<DD>',$html);
1089             if (startswith($d[0],'<A '))
1090             {
1091                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1092                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1093                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1094                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1095                 foreach($matches as $m)
1096                 {
1097                     $attr=$m[1]; $value=$m[2];
1098                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1099                     elseif ($attr=='ADD_DATE') $link['linkdate']=date('Ymd_His',intval($value));
1100                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1101                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1102                 }
1103                 if ($link['linkdate']!='' && $link['url']!='' && ($overwrite || empty($LINKSDB[$link['linkdate']])))
1104                 {
1105                     if ($private==1) $link['private']=1;
1106                     $LINKSDB[$link['linkdate']] = $link;
1107                     $import_count++;
1108                 }
1109             }
1110         }
1111         $LINKSDB->savedb();
1112         invalidateCaches();
1113         echo '<script language="JavaScript">alert("File '.$filename.' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1114     }
1115     else
1116     {
1117         echo '<script language="JavaScript">alert("File '.$filename.' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1118     }
1119 }
1120
1121 // -----------------------------------------------------------------------------------------------
1122 /* Template for the edit link form
1123     Input: $link : link to edit (assocative array item as returned by the LINKDB class)
1124 Output: An array : (string) : The html code of the edit link form.
1125                    (string) : The proper onload to use in body.
1126     Example: list($html,$onload)=templateEditForm($mylinkdb['20110805_124532']);
1127              echo $html;
1128 */
1129 function templateEditForm($link,$link_is_new=false)
1130 {
1131     $url=htmlspecialchars($link['url']);
1132     $title=htmlspecialchars($link['title']);
1133     $tags=htmlspecialchars($link['tags']);
1134     $description=htmlspecialchars($link['description']);
1135     $private = ($link['private']==0 ? '' : 'checked="yes"');
1136
1137     // Automatically focus on empty fields:
1138     $onload='onload="document.linkform.lf_tags.focus();"';
1139     if ($description=='') $onload='onload="document.linkform.lf_description.focus();"';
1140     if ($title=='') $onload='onload="document.linkform.lf_title.focus();"';
1141
1142     // Do not show "Delete" button if this is a new link.
1143     $delete_button = '<input type="submit" value="Delete" name="delete_link" class="bigbutton" style="margin-left:180px;" onClick="return confirmDeleteLink();">';
1144     if ($link_is_new) $delete_button='';
1145
1146     $token=getToken(); // XSRF protection.
1147     $returnurl_html = (isset($_SERVER['HTTP_REFERER']) ? '<input type="hidden" name="returnurl" value="'.htmlspecialchars($_SERVER['HTTP_REFERER']).'">' : '');
1148     $editlinkform=<<<HTML
1149 <div id="editlinkform">
1150     <form method="post" name="linkform">
1151         <input type="hidden" name="lf_linkdate" value="{$link['linkdate']}">
1152         <i>URL</i><br><input type="text" name="lf_url" value="{$url}" style="width:100%"><br>
1153         <i>Title</i><br><input type="text" name="lf_title" value="{$title}" style="width:100%"><br>
1154         <i>Description</i><br><textarea name="lf_description" rows="4" cols="25" style="width:100%">{$description}</textarea><br>
1155         <i>Tags</i><br><input type="text" id="lf_tags" name="lf_tags" value="{$tags}" style="width:100%"><br>
1156         <input type="checkbox" {$private} style="margin:7 0 10 0;" name="lf_private">&nbsp;<i>Private</i><br>
1157         <input type="submit" value="Save" name="save_edit" class="bigbutton" style="margin-left:40px;">
1158         <input type="submit" value="Cancel" name="cancel_edit" class="bigbutton" style="margin-left:40px;">
1159         {$delete_button}
1160         <input type="hidden" name="token" value="{$token}">
1161         {$returnurl_html}
1162     </form>
1163 </div>
1164 HTML;
1165     return array($editlinkform,$onload);
1166 }
1167
1168
1169 // -----------------------------------------------------------------------------------------------
1170 // Template for the list of links.
1171 // Returns html code to show the list of link according to parameters passed in URL (search terms, page...)
1172 function templateLinkList()
1173 {
1174     global $LINKSDB;
1175
1176     // Search according to entered search terms:
1177     $linksToDisplay=array();
1178     $searched='';
1179     if (!empty($_GET['searchterm'])) // Fulltext search
1180     {
1181         $linksToDisplay = $LINKSDB->filterFulltext(trim($_GET['searchterm']));
1182         $searched='&nbsp;<b>'.count($linksToDisplay).' results for <i>'.htmlspecialchars(trim($_GET['searchterm'])).'</i></b>:';
1183     }
1184     elseif (!empty($_GET['searchtags'])) // Search by tag
1185     {
1186         $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
1187         $tagshtml=''; foreach(explode(' ',trim($_GET['searchtags'])) as $tag) $tagshtml.='<span class="linktag" title="Remove tag"><a href="?removetag='.htmlspecialchars($tag).'">'.htmlspecialchars($tag).' <span style="border-left:1px solid #aaa; padding-left:5px; color:#6767A7;">x</span></a></span> ';
1188         $searched='&nbsp;<b>'.count($linksToDisplay).' results for tags '.$tagshtml.':</b>';
1189     }
1190     else
1191         $linksToDisplay = $LINKSDB;  // otherwise, display without filtering.
1192
1193     $linklist='';
1194     $actions='';
1195
1196     // Handle paging.
1197     /* Can someone explain to me why you get the following error when using array_keys() on an object which implements the interface ArrayAccess ???
1198        "Warning: array_keys() expects parameter 1 to be array, object given in ... "
1199        If my class implements ArrayAccess, why won't array_keys() accept it ?  ( $keys=array_keys($linksToDisplay); )
1200     */
1201     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; } // Stupid and ugly. Thanks php.
1202     $pagecount = ceil(count($keys)/$_SESSION['LINKS_PER_PAGE']);
1203     $pagecount = ($pagecount==0 ? 1 : $pagecount);
1204     $page=( empty($_GET['page']) ? 1 : intval($_GET['page']));
1205     $page = ( $page<1 ? 1 : $page );
1206     $page = ( $page>$pagecount ? $pagecount : $page );
1207     $i = ($page-1)*$_SESSION['LINKS_PER_PAGE']; // Start index.
1208     $end = $i+$_SESSION['LINKS_PER_PAGE'];
1209     while ($i<$end && $i<count($keys))
1210     {
1211         $link = $linksToDisplay[$keys[$i]];
1212         $description=$link['description'];
1213         $title=$link['title'];
1214         $classprivate = ($link['private']==0 ? '' : 'class="private"');
1215         if (isLoggedIn()) $actions=' <form method="GET" class="buttoneditform"><input type="hidden" name="edit_link" value="'.$link['linkdate'].'"><input type="submit" value="Edit" class="smallbutton"></form>';
1216         $tags='';
1217         if ($link['tags']!='') foreach(explode(' ',$link['tags']) as $tag) { $tags.='<span class="linktag" title="Add tag"><a href="?addtag='.htmlspecialchars($tag).'">'.htmlspecialchars($tag).'</a></span> '; }
1218         $linklist.='<li '.$classprivate.'><span class="linktitle"><a href="'.htmlspecialchars($link['url']).'">'.htmlspecialchars($title).'</a></span>'.$actions.'<br>';
1219         if ($description!='') $linklist.='<div class="linkdescription">'.nl2br(htmlspecialchars($description)).'</div><br>';
1220         if (!HIDE_TIMESTAMPS || isLoggedIn()) $linklist.='<span class="linkdate">'.htmlspecialchars(linkdate2locale($link['linkdate'])).' - </span>';
1221         $linklist.='<span class="linkurl">'.htmlspecialchars($link['url']).'</span><br>'.$tags."</li>\n";
1222         $i++;
1223     }
1224
1225     // Show paging.
1226     $searchterm= ( empty($_GET['searchterm']) ? '' : '&searchterm='.$_GET['searchterm'] );
1227     $searchtags= ( empty($_GET['searchtags']) ? '' : '&searchtags='.$_GET['searchtags'] );
1228     $paging='';
1229     if ($i!=count($keys)) $paging.='<a href="?page='.($page+1).$searchterm.$searchtags.'">&#x25C4;Older</a>';
1230     $paging.= '<span style="color:#fff; padding:0 20 0 20;">page '.$page.' / '.$pagecount.'</span>';
1231     if ($page>1) $paging.='<a href="?page='.($page-1).$searchterm.$searchtags.'">Newer&#x25BA;</a>';
1232     $linksperpage = <<<HTML
1233 <div style="float:right; padding-right:5px;">
1234 Links per page: <a href="?linksperpage=20">20</a> <a href="?linksperpage=50">50</a> <a href="?linksperpage=100">100</a>
1235  <form method="GET" style="display:inline;"><input type="text" name="linksperpage" size="2" style="height:15px;"></form></div>
1236 HTML;
1237     $paging = '<div class="paging">'.$linksperpage.$paging.'</div>';
1238     $linklist='<div id="linklist">'.$paging.$searched.'<ul>'.$linklist.'</ul>'.$paging.'</div>';
1239     return $linklist;
1240 }
1241
1242 // -----------------------------------------------------------------------------------------------
1243 // Template for the whole page.
1244 /* Input: $data (associative array).
1245                 Keys: 'body' : body of HTML document
1246                       'pageheader' : html code to show in page header (top of page)
1247                       'onload' : optional onload javascript for the <body>
1248 */
1249 function templatePage($data)
1250 {
1251     global $STARTTIME;
1252     global $LINKSDB;
1253     $shaarli_version = shaarli_version;
1254
1255     $newversion=checkUpdate();
1256     if ($newversion!='') $newversion='<div id="newversion"><span style="text-decoration:blink;">&#x25CF;</span> Shaarli '.htmlspecialchars($newversion).' is <a href="http://sebsauvage.net/wiki/doku.php?id=php:shaarli#download">available</a>.</div>';
1257     $linkcount = count($LINKSDB);
1258     $open='';
1259     if (OPEN_SHAARLI)
1260     {
1261         $menu=' <a href="?do=tools">Tools</a> &nbsp;<a href="?do=addlink"><b>Add link</b></a>';
1262         $open='Open ';
1263     }
1264     else
1265         $menu=(isLoggedIn() ? ' <a href="?do=logout">Logout</a> &nbsp;<a href="?do=tools">Tools</a> &nbsp;<a href="?do=addlink"><b>Add link</b></a>' : ' <a href="?do=login">Login</a>');
1266
1267     foreach(array('pageheader','body','onload') as $k) // make sure all required fields exist (put an empty string if not).
1268     {
1269         if (!array_key_exists($k,$data)) $data[$k]='';
1270     }
1271     $jsincludes=''; $jsincludes_bottom = '';
1272     if (OPEN_SHAARLI || isLoggedIn())
1273     {
1274         $jsincludes='<script language="JavaScript" src="jquery.min.js"></script><script language="JavaScript" src="jquery-ui.custom.min.js"></script>';
1275         $source = serverUrl().$_SERVER['SCRIPT_NAME'];
1276         $jsincludes_bottom = <<<JS
1277 <script language="JavaScript">
1278 $(document).ready(function()
1279 {
1280     $('#lf_tags').autocomplete({source:'{$source}?ws=tags',minLength:1});
1281     $('#searchtags').autocomplete({source:'{$source}?ws=tags',minLength:1});
1282     $('#fromtag').autocomplete({source:'{$source}?ws=singletag',minLength:1});
1283 });
1284 </script>
1285 JS;
1286     }
1287     $feedurl=htmlspecialchars(serverUrl().$_SERVER['SCRIPT_NAME'].'?do=rss');
1288     if (!empty($_GET['searchtags'])) $feedurl.='&searchtags='.$_GET['searchtags'];
1289     elseif (!empty($_GET['searchterm'])) $feedurl.='&searchterm='.$_GET['searchterm'];
1290
1291     $title = htmlspecialchars( $GLOBALS['title'] );
1292     echo <<<HTML
1293 <html>
1294 <head>
1295 <title>{$title}</title>
1296 <link rel="alternate" type="application/rss+xml" href="{$feedurl}" />
1297 <link type="text/css" rel="stylesheet" href="shaarli.css" />
1298 {$jsincludes}
1299 </head>
1300 <body {$data['onload']}>{$newversion}
1301 <div id="pageheader"><div style="float:right; font-style:italic; color:#bbb; text-align:right; padding:0 5 0 0;">Shaare your links...<br>{$linkcount} links</div>
1302     <b><i>{$title}</i></b> - <a href="?">Home</a>&nbsp;{$menu}&nbsp;<a href="{$feedurl}" style="padding-left:30px;">RSS Feed</a>
1303 &nbsp;&nbsp; <a href="?do=tagcloud">Tag cloud</a>
1304 {$data['pageheader']}
1305 </div>
1306 {$data['body']}
1307
1308 HTML;
1309     $exectime = round(microtime(true)-$STARTTIME,4);
1310     echo '<div id="footer"><b><a href="http://sebsauvage.net/wiki/doku.php?id=php:shaarli">Shaarli '.shaarli_version.'</a></b> - The personal, minimalist, super-fast, no-database delicious clone. By sebsauvage.net<br>Who gives a shit that this page was generated in '.$exectime.' seconds&nbsp;?</div>';
1311     if (isLoggedIn()) echo '<script language="JavaScript">function confirmDeleteLink() { var agree=confirm("Are you sure you want to delete this link ?"); if (agree) return true ; else return false ; }</script>';
1312     echo $jsincludes_bottom.'</body></html>';
1313 }
1314
1315 // -----------------------------------------------------------------------------------------------
1316 // Installation
1317 // This function should NEVER be called if the file data/config.php exists.
1318 function install()
1319 {
1320     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
1321     if (endsWith($_SERVER['SERVER_NAME'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
1322
1323     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
1324     {
1325         $tz = 'UTC';
1326         if (!empty($_POST['continent']) && !empty($_POST['city']))
1327             if (isTZvalid($_POST['continent'],$_POST['city']))
1328                 $tz = $_POST['continent'].'/'.$_POST['city'];
1329         $GLOBALS['timezone'] = $tz;
1330         // Everything is ok, let's create config file.
1331         $GLOBALS['login'] = $_POST['setlogin'];
1332         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1333         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1334         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.htmlspecialchars(serverUrl().$_SERVER['SCRIPT_NAME']) : $_POST['title'] );
1335         writeConfig();
1336         echo '<script language="JavaScript">alert("Shaarli is now configured. Please enter your login/password and start shaaring your links !");document.location=\'?do=login\';</script>';
1337         exit;
1338     }
1339
1340     // Display config form:
1341     list($timezone_form,$timezone_js) = templateTZform();
1342     $timezone_html=''; if ($timezone_form!='') $timezone_html='<tr><td valign="top"><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
1343     echo <<<HTML
1344 <html><head><title>Shaarli - Configuration</title><link type="text/css" rel="stylesheet" href="shaarli.css" />${timezone_js}</head>
1345 <body onload="document.installform.setlogin.focus();" style="padding:20px;"><h1>Shaarli - Shaare your links...</h1>
1346 It looks like it's the first time you run Shaarli. Please configure it:<br>
1347 <form method="POST" action="" name="installform" id="installform" style="border:1px solid black; padding:10 10 10 10;">
1348 <table border="0" cellpadding="20">
1349 <tr><td><b>Login:</b></td><td><input type="text" name="setlogin" size="30"></td></tr>
1350 <tr><td><b>Password:</b></td><td><input type="password" name="setpassword" size="30"></td></tr>
1351 {$timezone_html}
1352 <tr><td><b>Page title:</b></td><td><input type="text" name="title" size="30"></td></tr>
1353 <tr><td></td><td align="right"><input type="submit" name="Save" value="Save config" class="bigbutton"></td></tr>
1354 </table>
1355 </form></body></html>
1356 HTML;
1357     exit;
1358 }
1359
1360 // Generates the timezone selection form and javascript.
1361 // Input: (optional) current timezone (can be 'UTC/UTC'). It will be pre-selected.
1362 // Output: array(html,js)
1363 // Example: list($htmlform,$js) = templateTZform('Europe/Paris');  // Europe/Paris pre-selected.
1364 // Returns array('','') if server does not support timezones list. (eg. php 5.1 on free.fr)
1365 function templateTZform($ptz=false)
1366 {
1367     if (function_exists('timezone_identifiers_list')) // because of old php version (5.1) which can be found on free.fr
1368     {
1369         // Try to split the provided timezone.
1370         if ($ptz==false) { $l=timezone_identifiers_list(); $ptz=$l[0]; }
1371         $spos=strpos($ptz,'/'); $pcontinent=substr($ptz,0,$spos); $pcity=substr($ptz,$spos+1);
1372
1373         // Display config form:
1374         $timezone_form = '';
1375         $timezone_js = '';
1376         // The list is in the forme "Europe/Paris", "America/Argentina/Buenos_Aires"...
1377         // We split the list in continents/cities.
1378         $continents = array();
1379         $cities = array();
1380         foreach(timezone_identifiers_list() as $tz)
1381         {
1382             if ($tz=='UTC') $tz='UTC/UTC';
1383             $spos = strpos($tz,'/');
1384             if ($spos)
1385             {
1386                 $continent=substr($tz,0,$spos); $city=substr($tz,$spos+1);
1387                 $continents[$continent]=1;
1388                 if (!isset($cities[$continent])) $cities[$continent]=array();
1389                 $cities[$continent].='<option value="'.$city.'"'.($pcity==$city?'selected':'').'>'.$city.'</option>';
1390             }
1391         }
1392         $continents_html = '';
1393         $continents = array_keys($continents);
1394         foreach($continents as $continent)
1395             $continents_html.='<option  value="'.$continent.'"'.($pcontinent==$continent?'selected':'').'>'.$continent.'</option>';
1396         $cities_html = $cities[$pcontinent];
1397         $timezone_form = "Continent: <select name=\"continent\" id=\"continent\" onChange=\"onChangecontinent();\">${continents_html}</select><br /><br />";
1398         $timezone_form .= "City: <select name=\"city\" id=\"city\">${cities[$pcontinent]}</select><br /><br />";
1399         $timezone_js = "<script language=\"JavaScript\">";
1400         $timezone_js .= "function onChangecontinent(){document.getElementById(\"city\").innerHTML = citiescontinent[document.getElementById(\"continent\").value];}";
1401         $timezone_js .= "var citiescontinent = ".json_encode($cities).";" ;
1402         $timezone_js .= "</script>" ;
1403         return array($timezone_form,$timezone_js);
1404     }
1405     return array('','');
1406 }
1407
1408 // Tells if a timezone is valid or not.
1409 // If not valid, returns false.
1410 // If system does not support timezone list, returns false.
1411 function isTZvalid($continent,$city)
1412 {
1413     $tz = $continent.'/'.$city;
1414     if (function_exists('timezone_identifiers_list')) // because of old php version (5.1) which can be found on free.fr
1415     {
1416         if (in_array($tz, timezone_identifiers_list())) // it's a valid timezone ?
1417                     return true;
1418     }
1419     return false;
1420 }
1421
1422
1423 // Webservices (for use with jQuery/jQueryUI)
1424 // eg.  index.php?ws=tags&term=minecr
1425 function processWS()
1426 {
1427     if (empty($_GET['ws']) || empty($_GET['term'])) return;
1428     $term = $_GET['term'];
1429     global $LINKSDB;
1430     header('Content-Type: application/json; charset=utf-8');
1431
1432     // Search in tags (case insentitive, cumulative search)
1433     if ($_GET['ws']=='tags')
1434     {
1435         $tags=explode(' ',$term); $last = array_pop($tags); // Get the last term ("a b c d" ==> "a b c", "d")
1436         $addtags=''; if ($tags) $addtags=implode(' ',$tags).' '; // We will pre-pend previous tags
1437         $suggested=array();
1438         /* To speed up things, we store list of tags in session */
1439         if (empty($_SESSION['tags'])) $_SESSION['tags'] = $LINKSDB->allTags();
1440         foreach($_SESSION['tags'] as $key=>$value)
1441         {
1442             if (startsWith($key,$last,$case=false)) $suggested[$addtags.$key.' ']=0;
1443         }
1444         echo json_encode(array_keys($suggested));
1445         exit;
1446     }
1447
1448     // Search a single tag (case sentitive, single tag search)
1449     if ($_GET['ws']=='singletag')
1450     {
1451         /* To speed up things, we store list of tags in session */
1452         if (empty($_SESSION['tags'])) $_SESSION['tags'] = $LINKSDB->allTags();
1453         foreach($_SESSION['tags'] as $key=>$value)
1454         {
1455             if (startsWith($key,$term,$case=true)) $suggested[$key]=0;
1456         }
1457         echo json_encode(array_keys($suggested));
1458         exit;
1459     }
1460 }
1461
1462 // Re-write configuration file according to globals.
1463 // Requires some $GLOBALS to be set (login,hash,salt,title).
1464 // If the config file cannot be saved, an error message is dislayed and the user is redirected to "Tools" menu.
1465 // (otherwise, the function simply returns.)
1466 function writeConfig()
1467 {
1468     if (is_file(CONFIG_FILE) && !isLoggedIn()) die('You are not authorized to alter config.'); // Only logged in user can alter config.
1469     $config='<?php $GLOBALS[\'login\']='.var_export($GLOBALS['login'],true).'; $GLOBALS[\'hash\']='.var_export($GLOBALS['hash'],true).'; $GLOBALS[\'salt\']='.var_export($GLOBALS['salt'],true).'; ';
1470     $config .='$GLOBALS[\'timezone\']='.var_export($GLOBALS['timezone'],true).'; date_default_timezone_set('.var_export($GLOBALS['timezone'],true).'); $GLOBALS[\'title\']='.var_export($GLOBALS['title'],true).'; ?>';
1471     if (!file_put_contents(CONFIG_FILE,$config) || strcmp(file_get_contents(CONFIG_FILE),$config)!=0)
1472     {
1473         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>';
1474         exit;
1475     }
1476 }
1477
1478 // Invalidate caches when the database is changed or the user logs out.
1479 // (eg. tags cache).
1480 function invalidateCaches()
1481 {
1482     unset($_SESSION['tags']);
1483 }
1484
1485 $LINKSDB=new linkdb(isLoggedIn() || OPEN_SHAARLI);  // Read links from database (and filter private links if used it not logged in).
1486 if (startswith($_SERVER["QUERY_STRING"],'ws=')) { processWS(); exit; } // Webservices (for jQuery/jQueryUI)
1487 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=LINKS_PER_PAGE;
1488 if (startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
1489 renderPage();
1490 ?>