index.php

   1 <?php
   2 // Shaarli 0.0.25 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 // (but autocomplete fields will only work if you have php 5.2.x)
   9 // -----------------------------------------------------------------------------------------------
  10 // User config:
  11 $GLOBALS['config']['DATADIR'] = 'data'; // Data subdirectory
  12 $GLOBALS['config']['CONFIG_FILE'] = $GLOBALS['config']['DATADIR'].'/config.php'; // Configuration file (user login/password)
  13 $GLOBALS['config']['DATASTORE'] = $GLOBALS['config']['DATADIR'].'/datastore.php'; // Data storage file.
  14 $GLOBALS['config']['LINKS_PER_PAGE'] = 20; // Default links per page.
  15 $GLOBALS['config']['IPBANS_FILENAME'] = $GLOBALS['config']['DATADIR'].'/ipbans.php'; // File storage for failures and bans.
  16 $GLOBALS['config']['BAN_AFTER'] = 4;        // Ban IP after this many failures.
  17 $GLOBALS['config']['BAN_DURATION'] = 1800;  // Ban duration for IP address after login failures (in seconds) (1800 sec. = 30 minutes)
  18 $GLOBALS['config']['OPEN_SHAARLI'] = false; // If true, anyone can add/edit/delete links without having to login
  19 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false; // If true, the moment when links were saved are not shown to users that are not logged in.
  20 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true; // Enable thumbnails in links.
  21 $GLOBALS['config']['CACHEDIR'] = 'cache'; // Cache directory for thumbnails for SLOW services (like flickr)
  22 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true; // Enable Shaarli to store thumbnail in a local cache. Disable to reduce webspace usage.
  23
  24 // -----------------------------------------------------------------------------------------------
  25 // Program config (touch at your own risks !)
  26 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt'; // For updates check of Shaarli.
  27 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400 ; // Updates check frequency for Shaarli. 86400 seconds=24 hours
  28 ini_set('max_input_time','60');  // High execution time in case of problematic imports/exports.
  29 ini_set('memory_limit', '128M');  // Try to set max upload file size and read (May not work on some hosts).
  30 ini_set('post_max_size', '16M');
  31 ini_set('upload_max_filesize', '16M');
  32 define('PHPPREFIX','<?php /* '); // Prefix to encapsulate data in php code.
  33 define('PHPSUFFIX',' */ ?>'); // Suffix to encapsulate data in php code.
  34 $STARTTIME = microtime(true);  // Measure page execution time.
  35 checkphpversion();
  36 error_reporting(E_ALL^E_WARNING);  // See all error except warnings.
  37 //error_reporting(-1); // See all errors (for debugging only)
  38 ob_start();
  39
  40 // Optionnal config file.
  41 if (is_file($GLOBALS['config']['DATADIR'].'/options.php')) require($GLOBALS['config']['DATADIR'].'/options.php');
  42
  43 // In case stupid admin has left magic_quotes enabled in php.ini:
  44 if (get_magic_quotes_gpc())
  45 {
  46     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
  47     $_POST = array_map('stripslashes_deep', $_POST);
  48     $_GET = array_map('stripslashes_deep', $_GET);
  49     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
  50 }
  51 // Prevent caching: (yes, it's ugly)
  52 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
  53 header("Cache-Control: no-store, no-cache, must-revalidate");
  54 header("Cache-Control: post-check=0, pre-check=0", false);
  55 header("Pragma: no-cache");
  56 define('shaarli_version','0.0.25 beta');
  57 if (!is_dir($GLOBALS['config']['DATADIR'])) { mkdir($GLOBALS['config']['DATADIR'],0705); chmod($GLOBALS['config']['DATADIR'],0705); }
  58 if (!is_file($GLOBALS['config']['DATADIR'].'/.htaccess')) { file_put_contents($GLOBALS['config']['DATADIR'].'/.htaccess',"Allow from none\nDeny from all\n"); } // Protect data files.
  59 if ($GLOBALS['config']['ENABLE_LOCALCACHE'])
  60 {
  61     if (!is_dir($GLOBALS['config']['CACHEDIR'])) { mkdir($GLOBALS['config']['CACHEDIR'],0705); chmod($GLOBALS['config']['CACHEDIR'],0705); }
  62     if (!is_file($GLOBALS['config']['CACHEDIR'].'/.htaccess')) { file_put_contents($GLOBALS['config']['CACHEDIR'].'/.htaccess',"Allow from none\nDeny from all\n"); } // Protect data files.
  63 }
  64 if (!is_file($GLOBALS['config']['CONFIG_FILE'])) install();
  65 require $GLOBALS['config']['CONFIG_FILE'];  // Read login/password hash into $GLOBALS.
  66 // Small protection against dodgy config files:
  67 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.htmlspecialchars(serverUrl().$_SERVER['SCRIPT_NAME']);
  68 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
  69 autoLocale(); // Sniff browser language and set date format accordingly.
  70 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
  71 $LINKSDB=false;
  72
  73 // Check php version
  74 function checkphpversion()
  75 {
  76     if (version_compare(PHP_VERSION, '5.1.0') < 0)
  77     {
  78         header('Content-Type: text/plain; charset=utf-8');
  79         echo 'Your server supports php '.PHP_VERSION.'. Shaarli requires at last php 5.1.0, and thus cannot run. Sorry.';
  80         exit;
  81     }
  82 }
  83
  84 // Checks if an update is available for Shaarli.
  85 // (at most once a day, and only for registered user.)
  86 // Output: '' = no new version.
  87 //         other= the available version.
  88 function checkUpdate()
  89 {
  90     if (!isLoggedIn()) return ''; // Do not check versions for visitors.
  91
  92     // Get latest version number at most once a day.
  93     if (!is_file($GLOBALS['config']['UPDATECHECK_FILENAME']) || (filemtime($GLOBALS['config']['UPDATECHECK_FILENAME'])<time()-($GLOBALS['config']['UPDATECHECK_INTERVAL'])))
  94     {
  95         $version=shaarli_version;
  96         list($httpstatus,$headers,$data) = getHTTP('http://sebsauvage.net/files/shaarli_version.txt',2);
  97         if (strpos($httpstatus,'200 OK')) $version=$data;
  98         // If failed, nevermind. We don't want to bother the user with that.
  99         file_put_contents($GLOBALS['config']['UPDATECHECK_FILENAME'],$version); // touch file date
 100     }
 101     // Compare versions:
 102     $newestversion=file_get_contents($GLOBALS['config']['UPDATECHECK_FILENAME']);
 103     if (version_compare($newestversion,shaarli_version)==1) return $newestversion;
 104     return '';
 105 }
 106
 107 // -----------------------------------------------------------------------------------------------
 108 // Log to text file
 109 function logm($message)
 110 {
 111     $t = strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n";
 112     file_put_contents($GLOBALS['config']['DATADIR'].'/log.txt',$t,FILE_APPEND);
 113 }
 114
 115 /* Returns the small hash of a string
 116    eg. smallHash('20111006_131924') --> yZH23w
 117    Small hashes:
 118      - are unique (well, as unique as crc32, at last)
 119      - are always 6 characters long.
 120      - only use the following characters: a-z A-Z 0-9 - _ @
 121      - are NOT cryptographically secure (they CAN be forged)
 122    In Shaarli, they are used as a tinyurl-like link to individual entries.
 123 */
 124 function smallHash($text)
 125 {
 126     $t = rtrim(base64_encode(hash('crc32',$text,true)),'=');
 127     $t = str_replace('+','-',$t); // Get rid of characters which need encoding in URLs.
 128     $t = str_replace('/','_',$t);
 129     $t = str_replace('=','@',$t);
 130     return $t;
 131 }
 132
 133 // Function inspired from http://www.php.net/manual/en/function.preg-replace.php#85722
 134 function text2clickable($url)
 135 {
 136     $redir = empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'];
 137     return preg_replace('!((?:https?|ftp)://\S+[[:alnum:]]/?)!si','<a href="'.$redir.'$1" rel="nofollow">$1</a> ',$url);
 138 }
 139 // ------------------------------------------------------------------------------------------
 140 // Sniff browser language to display dates in the right format automatically.
 141 // (Note that is may not work on your server if the corresponding local is not installed.)
 142 function autoLocale()
 143 {
 144     $loc='en_US'; // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 145     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // eg. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 146     {   // (It's a bit crude, but it works very well. Prefered language is always presented first.)
 147         if (preg_match('/([a-z]{2}(-[a-z]{2})?)/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) $loc=$matches[1];
 148     }
 149     setlocale(LC_TIME,$loc);  // LC_TIME = Set local for date/time format only.
 150 }
 151
 152 // ------------------------------------------------------------------------------------------
 153 // Session management
 154 define('INACTIVITY_TIMEOUT',3600); // (in seconds). If the user does not access any page within this time, his/her session is considered expired.
 155 ini_set('session.use_cookies', 1);       // Use cookies to store session.
 156 ini_set('session.use_only_cookies', 1);  // Force cookies for session (phpsessionID forbidden in URL)
 157 ini_set('session.use_trans_sid', false); // Prevent php to use sessionID in URL if cookies are disabled.
 158 session_name('shaarli');
 159 session_start();
 160
 161 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 162 function allIPs()
 163 {
 164     $ip = $_SERVER["REMOTE_ADDR"];
 165     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 166     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 167     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 168     return $ip;
 169 }
 170
 171 // Check that user/password is correct.
 172 function check_auth($login,$password)
 173 {
 174     $hash = sha1($password.$login.$GLOBALS['salt']);
 175     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 176     {   // Login/password is correct.
 177         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // generate unique random number (different than phpsessionid)
 178         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 179         $_SESSION['username']=$login;
 180         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 181         logm('Login successful');
 182         return True;
 183     }
 184     logm('Login failed for user '.$login);
 185     return False;
 186 }
 187
 188 // Returns true if the user is logged in.
 189 function isLoggedIn()
 190 {
 191     if ($GLOBALS['config']['OPEN_SHAARLI']) return true;
 192
 193     // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 194     if (empty($_SESSION['uid']) || $_SESSION['ip']!=allIPs() || time()>=$_SESSION['expires_on'])
 195     {
 196         logout();
 197         return false;
 198     }
 199     if (!empty($_SESSION['longlastingsession']))  $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 200     else $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 201
 202     return true;
 203 }
 204
 205 // Force logout.
 206 function logout() { if (isset($_SESSION)) { unset($_SESSION['uid']); unset($_SESSION['ip']); unset($_SESSION['username']);}  }
 207
 208
 209 // ------------------------------------------------------------------------------------------
 210 // Brute force protection system
 211 // Several consecutive failed logins will ban the IP address for 30 minutes.
 212 if (!is_file($GLOBALS['config']['IPBANS_FILENAME'])) file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export(array('FAILURES'=>array(),'BANS'=>array()),true).";\n?>");
 213 include $GLOBALS['config']['IPBANS_FILENAME'];
 214 // Signal a failed login. Will ban the IP if too many failures:
 215 function ban_loginFailed()
 216 {
 217     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 218     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 219     $gb['FAILURES'][$ip]++;
 220     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 221     {
 222         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 223         logm('IP address banned from login');
 224     }
 225     $GLOBALS['IPBANS'] = $gb;
 226     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 227 }
 228
 229 // Signals a successful login. Resets failed login counter.
 230 function ban_loginOk()
 231 {
 232     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 233     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 234     $GLOBALS['IPBANS'] = $gb;
 235     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 236 }
 237
 238 // Checks if the user CAN login. If 'true', the user can try to login.
 239 function ban_canLogin()
 240 {
 241     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 242     if (isset($gb['BANS'][$ip]))
 243     {
 244         // User is banned. Check if the ban has expired:
 245         if ($gb['BANS'][$ip]<=time())
 246         {   // Ban expired, user can try to login again.
 247             logm('Ban lifted.');
 248             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 249             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 250             return true; // Ban has expired, user can login.
 251         }
 252         return false; // User is banned.
 253     }
 254     return true; // User is not banned.
 255 }
 256
 257 // ------------------------------------------------------------------------------------------
 258 // Process login form: Check if login/password is correct.
 259 if (isset($_POST['login']))
 260 {
 261     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 262     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 263     {   // Login/password is ok.
 264         ban_loginOk();
 265         // If user wants to keep the session cookie even after the browser closes:
 266         if (!empty($_POST['longlastingsession']))
 267         {
 268             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 269             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 270             session_set_cookie_params($_SESSION['longlastingsession']); // Set session cookie expiration on client side
 271             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 272         }
 273         else // Standard session expiration (=when browser closes)
 274         {
 275             session_set_cookie_params(0); // 0 means "When browser closes"
 276             session_regenerate_id(true);
 277         }
 278         // Optional redirect after login:
 279         if (isset($_GET['post'])) { header('Location: ?post='.urlencode($_GET['post']).(!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').(!empty($_GET['source'])?'&source='.urlencode($_GET['source']):'')); exit; }
 280         if (isset($_POST['returnurl']))
 281         {
 282             if (endsWith($_POST['returnurl'],'?do=login')) { header('Location: ?'); exit; } // Prevent loops over login screen.
 283             header('Location: '.$_POST['returnurl']); exit;
 284         }
 285         header('Location: ?'); exit;
 286     }
 287     else
 288     {
 289         ban_loginFailed();
 290         echo '<script language="JavaScript">alert("Wrong login/password.");document.location=\'?do=login\';</script>'; // Redirect to login screen.
 291         exit;
 292     }
 293 }
 294
 295 // ------------------------------------------------------------------------------------------
 296 // Misc utility functions:
 297
 298 // Returns the server URL (including port and http/https), without path.
 299 // eg. "http://myserver.com:8080"
 300 // You can append $_SERVER['SCRIPT_NAME'] to get the current script URL.
 301 function serverUrl()
 302 {
 303         $serverport = ($_SERVER["SERVER_PORT"]!='80' ? ':'.$_SERVER["SERVER_PORT"] : '');
 304         return 'http'.(!empty($_SERVER['HTTPS'])?'s':'').'://'.$_SERVER["SERVER_NAME"].$serverport;
 305 }
 306
 307 // Convert post_max_size/upload_max_filesize (eg.'16M') parameters to bytes.
 308 function return_bytes($val)
 309 {
 310     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 311     switch($last)
 312     {
 313         case 'g': $val *= 1024;
 314         case 'm': $val *= 1024;
 315         case 'k': $val *= 1024;
 316     }
 317     return $val;
 318 }
 319
 320 // Try to determine max file size for uploads (POST).
 321 // Returns an integer (in bytes)
 322 function getMaxFileSize()
 323 {
 324     $size1 = return_bytes(ini_get('post_max_size'));
 325     $size2 = return_bytes(ini_get('upload_max_filesize'));
 326     // Return the smaller of two:
 327     $maxsize = min($size1,$size2);
 328     // FIXME: Then convert back to readable notations ? (eg. 2M instead of 2000000)
 329     return $maxsize;
 330 }
 331
 332 // Tells if a string start with a substring or not.
 333 function startsWith($haystack,$needle,$case=true)
 334 {
 335     if($case){return (strcmp(substr($haystack, 0, strlen($needle)),$needle)===0);}
 336     return (strcasecmp(substr($haystack, 0, strlen($needle)),$needle)===0);
 337 }
 338
 339 // Tells if a string ends with a substring or not.
 340 function endsWith($haystack,$needle,$case=true)
 341 {
 342     if($case){return (strcmp(substr($haystack, strlen($haystack) - strlen($needle)),$needle)===0);}
 343     return (strcasecmp(substr($haystack, strlen($haystack) - strlen($needle)),$needle)===0);
 344 }
 345
 346 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 347     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 348     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 349 function linkdate2timestamp($linkdate)
 350 {
 351     $Y=$M=$D=$h=$m=$s=0;
 352     $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 353     return mktime($h,$m,$s,$M,$D,$Y);
 354 }
 355
 356 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 357     (used to build the pubDate attribute in RSS feed.)  */
 358 function linkdate2rfc822($linkdate)
 359 {
 360     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 361 }
 362
 363 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 364     (used to build the updated tags in ATOM feed.)  */
 365 function linkdate2iso8601($linkdate)
 366 {
 367     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 368 }
 369
 370 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a localized date format.
 371     (used to display link date on screen)
 372     The date format is automatically chosen according to locale/languages sniffed from browser headers (see autoLocale()). */
 373 function linkdate2locale($linkdate)
 374 {
 375     return utf8_encode(strftime('%c',linkdate2timestamp($linkdate))); // %c is for automatic date format according to locale.
 376     // Note that if you use a local which is not installed on your webserver,
 377     // the date will not be displayed in the chosen locale, but probably in US notation.
 378 }
 379
 380 // Parse HTTP response headers and return an associative array.
 381 function http_parse_headers( $headers )
 382 {
 383     $res=array();
 384     foreach($headers as $header)
 385     {
 386         $i = strpos($header,': ');
 387         if ($i)
 388         {
 389             $key=substr($header,0,$i);
 390             $value=substr($header,$i+2,strlen($header)-$i-2);
 391             $res[$key]=$value;
 392         }
 393     }
 394     return $res;
 395 }
 396
 397 /* GET an URL.
 398    Input: $url : url to get (http://...)
 399           $timeout : Network timeout (will wait this many seconds for an anwser before giving up).
 400    Output: An array.  [0] = HTTP status message (eg. "HTTP/1.1 200 OK") or error message
 401                       [1] = associative array containing HTTP response headers (eg. echo getHTTP($url)[1]['Content-Type'])
 402                       [2] = data
 403     Example: list($httpstatus,$headers,$data) = getHTTP('http://sebauvage.net/');
 404              if (strpos($httpstatus,'200 OK'))
 405                  echo 'Data type: '.htmlspecialchars($headers['Content-Type']);
 406              else
 407                  echo 'There was an error: '.htmlspecialchars($httpstatus)
 408 */
 409 function getHTTP($url,$timeout=30)
 410 {
 411     try
 412     {
 413         $options = array('http'=>array('method'=>'GET','timeout' => $timeout)); // Force network timeout
 414         $context = stream_context_create($options);
 415         $data=file_get_contents($url,false,$context,-1, 4000000); // We download at most 4 Mb from source.
 416         if (!$data) { $lasterror=error_get_last();  return array($lasterror['message'],array(),''); }
 417         $httpStatus=$http_response_header[0]; // eg. "HTTP/1.1 200 OK"
 418         $responseHeaders=http_parse_headers($http_response_header);
 419         return array($httpStatus,$responseHeaders,$data);
 420     }
 421     catch (Exception $e)  // getHTTP *can* fail silentely (we don't care if the title cannot be fetched)
 422     {
 423         return array($e->getMessage(),'','');
 424     }
 425 }
 426
 427 // Extract title from an HTML document.
 428 // (Returns an empty string if not found.)
 429 function html_extract_title($html)
 430 {
 431   return preg_match('!<title>(.*)</title>!is', $html, $matches) ? trim(str_replace("\n",' ', $matches[1])) : '' ;
 432 }
 433
 434 // ------------------------------------------------------------------------------------------
 435 // Token management for XSRF protection
 436 // Token should be used in any form which acts on data (create,update,delete,import...).
 437 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 438
 439 // Returns a token.
 440 function getToken()
 441 {
 442     $rnd = sha1(uniqid('',true).'_'.mt_rand());  // We generate a random string.
 443     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 444     return $rnd;
 445 }
 446
 447 // Tells if a token is ok. Using this function will destroy the token.
 448 // true=token is ok.
 449 function tokenOk($token)
 450 {
 451     if (isset($_SESSION['tokens'][$token]))
 452     {
 453         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 454         return true; // Token is ok.
 455     }
 456     return false; // Wrong token, or already used.
 457 }
 458
 459 // ------------------------------------------------------------------------------------------
 460 /* Data storage for links.
 461    This object behaves like an associative array.
 462    Example:
 463       $mylinks = new linkdb();
 464       echo $mylinks['20110826_161819']['title'];
 465       foreach($mylinks as $link)
 466          echo $link['title'].' at url '.$link['url'].' ; description:'.$link['description'];
 467
 468    We implement 3 interfaces:
 469      - ArrayAccess so that this object behaves like an associative array.
 470      - Iterator so that this object can be used in foreach() loops.
 471      - Countable interface so that we can do a count() on this object.
 472 */
 473 class linkdb implements Iterator, Countable, ArrayAccess
 474
 475 {
 476     private $links; // List of links (associative array. Key=linkdate (eg. "20110823_124546"), value= associative array (keys:title,description...)
 477     private $urls;  // List of all recorded URLs (key=url, value=linkdate) for fast reserve search (url-->linkdate)
 478     private $keys;  // List of linkdate keys (for the Iterator interface implementation)
 479     private $position; // Position in the $this->keys array. (for the Iterator interface implementation.)
 480     private $loggedin; // Is the used logged in ? (used to filter private links)
 481
 482     // Constructor:
 483     function __construct($isLoggedIn)
 484     // Input : $isLoggedIn : is the used logged in ?
 485     {
 486         $this->loggedin = $isLoggedIn;
 487         $this->checkdb(); // Make sure data file exists.
 488         $this->readdb();  // Then read it.
 489     }
 490
 491     // ---- Countable interface implementation
 492     public function count() { return count($this->links); }
 493
 494     // ---- ArrayAccess interface implementation
 495     public function offsetSet($offset, $value)
 496     {
 497         if (!$this->loggedin) die('You are not authorized to add a link.');
 498         if (empty($value['linkdate']) || empty($value['url'])) die('Internal Error: A link should always have a linkdate and url.');
 499         if (empty($offset)) die('You must specify a key.');
 500         $this->links[$offset] = $value;
 501         $this->urls[$value['url']]=$offset;
 502     }
 503     public function offsetExists($offset) { return array_key_exists($offset,$this->links); }
 504     public function offsetUnset($offset)
 505     {
 506         if (!$this->loggedin) die('You are not authorized to delete a link.');
 507         $url = $this->links[$offset]['url']; unset($this->urls[$url]);
 508         unset($this->links[$offset]);
 509     }
 510     public function offsetGet($offset) { return isset($this->links[$offset]) ? $this->links[$offset] : null; }
 511
 512     // ---- Iterator interface implementation
 513     function rewind() { $this->keys=array_keys($this->links); rsort($this->keys); $this->position=0; } // Start over for iteration, ordered by date (latest first).
 514     function key() { return $this->keys[$this->position]; } // current key
 515     function current() { return $this->links[$this->keys[$this->position]]; } // current value
 516     function next() { ++$this->position; } // go to next item
 517     function valid() { return isset($this->keys[$this->position]); }    // Check if current position is valid.
 518
 519     // ---- Misc methods
 520     private function checkdb() // Check if db directory and file exists.
 521     {
 522         if (!file_exists($GLOBALS['config']['DATASTORE'])) // Create a dummy database for example.
 523         {
 524              $this->links = array();
 525              $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');
 526              $this->links[$link['linkdate']] = $link;
 527              $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');
 528              $this->links[$link['linkdate']] = $link;
 529              file_put_contents($GLOBALS['config']['DATASTORE'], PHPPREFIX.base64_encode(gzdeflate(serialize($this->links))).PHPSUFFIX); // Write database to disk
 530         }
 531     }
 532
 533     // Read database from disk to memory
 534     private function readdb()
 535     {
 536         // Read data
 537         $this->links=(file_exists($GLOBALS['config']['DATASTORE']) ? unserialize(gzinflate(base64_decode(substr(file_get_contents($GLOBALS['config']['DATASTORE']),strlen(PHPPREFIX),-strlen(PHPSUFFIX))))) : array() );
 538         // Note that gzinflate is faster than gzuncompress. See: http://www.php.net/manual/en/function.gzdeflate.php#96439
 539
 540         // If user is not logged in, filter private links.
 541         if (!$this->loggedin)
 542         {
 543             $toremove=array();
 544             foreach($this->links as $link) { if ($link['private']!=0) $toremove[]=$link['linkdate']; }
 545             foreach($toremove as $linkdate) { unset($this->links[$linkdate]); }
 546         }
 547
 548         // Keep the list of the mapping URLs-->linkdate up-to-date.
 549         $this->urls=array();
 550         foreach($this->links as $link) { $this->urls[$link['url']]=$link['linkdate']; }
 551     }
 552
 553     // Save database from memory to disk.
 554     public function savedb()
 555     {
 556         if (!$this->loggedin) die('You are not authorized to change the database.');
 557         file_put_contents($GLOBALS['config']['DATASTORE'], PHPPREFIX.base64_encode(gzdeflate(serialize($this->links))).PHPSUFFIX);
 558     }
 559
 560     // Returns the link for a given URL (if it exists). false it does not exist.
 561     public function getLinkFromUrl($url)
 562     {
 563         if (isset($this->urls[$url])) return $this->links[$this->urls[$url]];
 564         return false;
 565     }
 566
 567     // Case insentitive search among links (in url, title and description). Returns filtered list of links.
 568     // eg. print_r($mydb->filterFulltext('hollandais'));
 569     public function filterFulltext($searchterms)
 570     {
 571         // FIXME: explode(' ',$searchterms) and perform a AND search.
 572         // FIXME: accept double-quotes to search for a string "as is" ?
 573         $filtered=array();
 574         $s = strtolower($searchterms);
 575         foreach($this->links as $l)
 576         {
 577             $found=strpos(strtolower($l['title']),$s) || strpos(strtolower($l['description']),$s) || strpos(strtolower($l['url']),$s) || strpos(strtolower($l['tags']),$s);
 578             if ($found) $filtered[$l['linkdate']] = $l;
 579         }
 580         krsort($filtered);
 581         return $filtered;
 582     }
 583
 584     // Filter by tag.
 585     // You can specify one or more tags (tags can be separated by space or comma).
 586     // eg. print_r($mydb->filterTags('linux programming'));
 587     public function filterTags($tags,$casesensitive=false)
 588     {
 589         $t = str_replace(',',' ',($casesensitive?$tags:strtolower($tags)));
 590         $searchtags=explode(' ',$t);
 591         $filtered=array();
 592         foreach($this->links as $l)
 593         {
 594             $linktags = explode(' ',($casesensitive?$l['tags']:strtolower($l['tags'])));
 595             if (count(array_intersect($linktags,$searchtags)) == count($searchtags))
 596                 $filtered[$l['linkdate']] = $l;
 597         }
 598         krsort($filtered);
 599         return $filtered;
 600     }
 601
 602     // Filter by smallHash.
 603     // Only 1 article is returned.
 604     public function filterSmallHash($smallHash)
 605     {
 606         $filtered=array();
 607         foreach($this->links as $l)
 608         {
 609             if ($smallHash==smallHash($l['linkdate'])) // Yes, this is ugly and slow
 610             {
 611                 $filtered[$l['linkdate']] = $l;
 612                 return $filtered;
 613             }
 614         }
 615         return $filtered;
 616     }
 617
 618     // Returns the list of all tags
 619     // Output: associative array key=tags, value=0
 620     public function allTags()
 621     {
 622         $tags=array();
 623         foreach($this->links as $link)
 624             foreach(explode(' ',$link['tags']) as $tag)
 625                 if (!empty($tag)) $tags[$tag]=(empty($tags[$tag]) ? 1 : $tags[$tag]+1);
 626         arsort($tags); // Sort tags by usage (most used tag first)
 627         return $tags;
 628     }
 629 }
 630
 631 // ------------------------------------------------------------------------------------------
 632 // Ouput the last 50 links in RSS 2.0 format.
 633 function showRSS()
 634 {
 635     global $LINKSDB;
 636
 637     // Optionnaly filter the results:
 638     $linksToDisplay=array();
 639     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 640     elseif (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 641     else $linksToDisplay = $LINKSDB;
 642
 643     header('Content-Type: application/rss+xml; charset=utf-8');
 644     $pageaddr=htmlspecialchars(serverUrl().$_SERVER["SCRIPT_NAME"]);
 645     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 646     echo '<channel><title>'.htmlspecialchars($GLOBALS['title']).'</title><link>'.$pageaddr.'</link>';
 647     echo '<description>Shared links</description><language></language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 648     $i=0;
 649     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 650     while ($i<50 && $i<count($keys))
 651     {
 652         $link = $linksToDisplay[$keys[$i]];
 653         $rfc822date = linkdate2rfc822($link['linkdate']);
 654         echo '<item><title>'.htmlspecialchars($link['title']).'</title><guid>'.htmlspecialchars($link['url']).'</guid><link>'.htmlspecialchars($link['url']).'</link>';
 655         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.htmlspecialchars($rfc822date).'</pubDate>';
 656         echo '<description><![CDATA['.nl2br(htmlspecialchars($link['description'])).']]></description></item>'."\n";
 657         $i++;
 658     }
 659     echo '</channel></rss>';
 660     exit;
 661 }
 662
 663 // ------------------------------------------------------------------------------------------
 664 // Ouput the last 50 links in ATOM format.
 665 function showATOM()
 666 {
 667     global $LINKSDB;
 668
 669     // Optionnaly filter the results:
 670     $linksToDisplay=array();
 671     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 672     elseif (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 673     else $linksToDisplay = $LINKSDB;
 674
 675     header('Content-Type: application/atom+xml; charset=utf-8');
 676     $pageaddr=htmlspecialchars(serverUrl().$_SERVER["SCRIPT_NAME"]);
 677     $latestDate = '';
 678     $entries='';
 679     $i=0;
 680     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 681     while ($i<50 && $i<count($keys))
 682     {
 683         $link = $linksToDisplay[$keys[$i]];
 684         $iso8601date = linkdate2iso8601($link['linkdate']);
 685         $latestDate = max($latestDate,$iso8601date);
 686         $entries.='<entry><title>'.htmlspecialchars($link['title']).'</title><link href="'.htmlspecialchars($link['url']).'"/><id>'.htmlspecialchars($link['url']).'</id>';
 687         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.htmlspecialchars($iso8601date).'</updated>';
 688         $entries.='<summary>'.nl2br(htmlspecialchars($link['description'])).'</summary></entry>'."\n";
 689         $i++;
 690     }
 691     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
 692     $feed.='<title>'.htmlspecialchars($GLOBALS['title']).'</title>';
 693     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.htmlspecialchars($latestDate).'</updated>';
 694     $feed.='<link href="'.htmlspecialchars($pageaddr).'" />';
 695     $feed.='<author><uri>'.htmlspecialchars($pageaddr).'</uri></author>';
 696     $feed.='<id>'.htmlspecialchars($pageaddr).'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
 697     $feed.=$entries;
 698     $feed.='</feed>';
 699     echo $feed;
 700     exit;
 701 }
 702
 703 // ------------------------------------------------------------------------------------------
 704 // Render HTML page:
 705 function renderPage()
 706 {
 707     global $STARTTIME;
 708     global $LINKSDB;
 709
 710     // Well... rendering the page would be 100x better with the excellent Smarty, but I don't want to tie this minimalist project to 100+ files.
 711     // So I use a custom templating system.
 712
 713     // -------- Display login form.
 714     if (startswith($_SERVER["QUERY_STRING"],'do=login'))
 715     {
 716         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
 717         if (!ban_canLogin())
 718         {
 719             $loginform='<div id="headerform">You have been banned from login after too many failed attempts. Try later.</div>';
 720             $data = array('pageheader'=>$loginform,'body'=>'','onload'=>'');
 721             templatePage($data);
 722             exit;
 723         }
 724         $returnurl_html = (isset($_SERVER['HTTP_REFERER']) ? '<input type="hidden" name="returnurl" value="'.htmlspecialchars($_SERVER['HTTP_REFERER']).'">' : '');
 725         $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"><br>';
 726         $loginform.='<input style="margin:10 0 0 40;" type="checkbox" name="longlastingsession" id="longlastingsession"><label for="longlastingsession">&nbsp;Stay signed in (Do not check on public computers)</label><input type="hidden" name="token" value="'.getToken().'">'.$returnurl_html.'</form></div>';
 727         $onload = 'onload="document.loginform.login.focus();"';
 728         $data = array('pageheader'=>$loginform,'body'=>'','onload'=>$onload);
 729         templatePage($data);
 730         exit;
 731     }
 732     // -------- User wants to logout.
 733     if (startswith($_SERVER["QUERY_STRING"],'do=logout'))
 734     {
 735         invalidateCaches();
 736         logout();
 737         header('Location: ?');
 738         exit;
 739     }
 740
 741     // -------- Tag cloud
 742     if (startswith($_SERVER["QUERY_STRING"],'do=tagcloud'))
 743     {
 744         $tags= $LINKSDB->allTags();
 745         // We sort tags alphabetically, then choose a font size according to count.
 746         // First, find max value.
 747         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
 748         ksort($tags);
 749         $cloud='';
 750         foreach($tags as $key=>$value)
 751         {
 752             $size = max(40*$value/$maxcount,8); // Minimum size 8.
 753             $colorvalue = 128-ceil(127*$value/$maxcount);
 754             $color='rgb('.$colorvalue.','.$colorvalue.','.$colorvalue.')';
 755             $cloud.= '<span style="color:#99f; font-size:9pt; padding-left:5px; padding-right:2px;">'.$value.'</span><a href="?searchtags='.htmlspecialchars($key).'" style="font-size:'.$size.'pt; font-weight:bold; color:'.$color.';">'.htmlspecialchars($key).'</a> ';
 756         }
 757         $cloud='<div id="cloudtag">'.$cloud.'</div>';
 758         $data = array('pageheader'=>'','body'=>$cloud,'onload'=>'');
 759         templatePage($data);
 760         exit;
 761     }
 762
 763     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
 764     if (isset($_GET['addtag']))
 765     {
 766         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
 767         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
 768         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
 769         $params['searchtags'] = (empty($params['searchtags']) ?  trim($_GET['addtag']) : trim($params['searchtags']).' '.urlencode(trim($_GET['addtag'])));
 770         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
 771         header('Location: ?'.http_build_query($params));
 772         exit;
 773     }
 774
 775     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
 776     if (isset($_GET['removetag']))
 777     {
 778         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
 779         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?'); exit; } // In case browser does not send HTTP_REFERER
 780         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
 781         if (isset($params['searchtags']))
 782         {
 783             $tags = explode(' ',$params['searchtags']);
 784             $tags=array_diff($tags, array($_GET['removetag'])); // Remove value from array $tags.
 785             if (count($tags)==0) unset($params['searchtags']); else $params['searchtags'] = implode(' ',$tags);
 786             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
 787         }
 788         header('Location: ?'.http_build_query($params));
 789         exit;
 790     }
 791
 792     // -------- User wants to change the number of links per page (linksperpage=...)
 793     if (isset($_GET['linksperpage']))
 794     {
 795         if (is_numeric($_GET['linksperpage'])) { $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage'])); }
 796         header('Location: '.(empty($_SERVER['HTTP_REFERER'])?'?':$_SERVER['HTTP_REFERER']));
 797         exit;
 798     }
 799
 800
 801     // -------- Handle other actions allowed for non-logged in users:
 802     if (!isLoggedIn())
 803     {
 804         // User tries to post new link but is not loggedin:
 805         // Show login screen, then redirect to ?post=...
 806         if (isset($_GET['post']))
 807         {
 808             header('Location: ?do=login&post='.urlencode($_GET['post']).(isset($_GET['title'])?'&title='.urlencode($_GET['title']):'').(isset($_GET['source'])?'&source='.urlencode($_GET['source']):'')); // Redirect to login page, then back to post link.
 809             exit;
 810         }
 811
 812         // Show search form and display list of links.
 813         $searchform=<<<HTML
 814 <div id="headerform" style="width:100%; white-space:nowrap;";>
 815     <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>
 816     <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>
 817 </div>
 818 HTML;
 819         $data = array('pageheader'=>$searchform,'body'=>templateLinkList(),'onload'=>'');
 820         templatePage($data);
 821         exit; // Never remove this one ! All operations below are reserved for logged in user.
 822     }
 823
 824     // -------- All other functions are reserved for the registered user:
 825
 826     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
 827     if (startswith($_SERVER["QUERY_STRING"],'do=tools'))
 828     {
 829         $pageabsaddr=serverUrl().$_SERVER["SCRIPT_NAME"]; // Why doesn't php have a built-in function for that ?
 830         // The javascript code for the bookmarklet:
 831         $changepwd = ($GLOBALS['config']['OPEN_SHAARLI'] ? '' : '<a href="?do=changepasswd"><b>Change password</b></a> - Change your password.<br><br>' );
 832         $toolbar= <<<HTML
 833 <div id="headerform"><br>
 834     {$changepwd}
 835     <a href="?do=configure"><b>Configure your Shaarli</b></a> - Change Title, timezone...<br><br>
 836     <a href="?do=changetag"><b>Rename/delete tags</b></a> - Rename or delete a tag in all links.<br><br>
 837     <a href="?do=import"><b>Import</b></a> - Import Netscape html bookmarks (as exported from Firefox, Chrome, Opera, delicious...)<br><br>
 838     <a href="?do=export"><b>Export</b></a> - Export Netscape html bookmarks (which can be imported in Firefox, Chrome, Opera, delicious...)<br><br>
 839     <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>
 840 </div>
 841 HTML;
 842         $data = array('pageheader'=>$toolbar,'body'=>'','onload'=>'');
 843         templatePage($data);
 844         exit;
 845     }
 846
 847     // -------- User wants to change his/her password.
 848     if (startswith($_SERVER["QUERY_STRING"],'do=changepasswd'))
 849     {
 850         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
 851         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
 852         {
 853             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away !
 854
 855             // Make sure old password is correct.
 856             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
 857             if ($oldhash!=$GLOBALS['hash']) { echo '<script language="JavaScript">alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
 858             // Save new password
 859             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
 860             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
 861             writeConfig();
 862             echo '<script language="JavaScript">alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
 863             exit;
 864         }
 865         else
 866         {
 867             $token = getToken();
 868             $changepwdform= <<<HTML
 869 <form method="POST" action="" name="changepasswordform" style="padding:10 10 10 10;">
 870 Old password: <input type="password" name="oldpassword">&nbsp; &nbsp;
 871 New password: <input type="password" name="setpassword">
 872 <input type="hidden" name="token" value="{$token}">
 873 <input type="submit" name="Save" value="Save password" class="bigbutton"></form>
 874 HTML;
 875             $data = array('pageheader'=>$changepwdform,'body'=>'','onload'=>'onload="document.changepasswordform.oldpassword.focus();"');
 876             templatePage($data);
 877             exit;
 878         }
 879     }
 880
 881     // -------- User wants to change configuration
 882     if (startswith($_SERVER["QUERY_STRING"],'do=configure'))
 883     {
 884         if (!empty($_POST['title']) )
 885         {
 886             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away !
 887             $tz = 'UTC';
 888             if (!empty($_POST['continent']) && !empty($_POST['city']))
 889                 if (isTZvalid($_POST['continent'],$_POST['city']))
 890                     $tz = $_POST['continent'].'/'.$_POST['city'];
 891             $GLOBALS['timezone'] = $tz;
 892             $GLOBALS['title']=$_POST['title'];
 893             $GLOBALS['redirector']=$_POST['redirector'];
 894             writeConfig();
 895             echo '<script language="JavaScript">alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
 896             exit;
 897         }
 898         else
 899         {
 900             $token = getToken();
 901             $title = htmlspecialchars( empty($GLOBALS['title']) ? '' : $GLOBALS['title'] , ENT_QUOTES);
 902             $redirector = htmlspecialchars( empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] , ENT_QUOTES);
 903             list($timezone_form,$timezone_js) = templateTZform($GLOBALS['timezone']);
 904             $timezone_html=''; if ($timezone_form!='') $timezone_html='<tr><td valign="top"><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
 905             $changepwdform= <<<HTML
 906 ${timezone_js}<form method="POST" action="" name="configform" id="configform"><input type="hidden" name="token" value="{$token}">
 907 <table border="0" cellpadding="20">
 908 <tr><td><b>Page title:</b></td><td><input type="text" name="title" id="title" size="50" value="{$title}"></td></tr>
 909 {$timezone_html}
 910 <tr><td valign="top"><b>Redirector</b></td><td><input type="text" name="redirector" id="redirector" size="50" value="{$redirector}"><br>(e.g. <i>http://anonym.to/?</i> will mask the HTTP_REFERER)</td></tr>
 911 <tr><td></td><td align="right"><input type="submit" name="Save" value="Save config" class="bigbutton"></td></tr>
 912 </table>
 913 </form>
 914 HTML;
 915             $data = array('pageheader'=>$changepwdform,'body'=>'','onload'=>'onload="document.configform.title.focus();"');
 916             templatePage($data);
 917             exit;
 918         }
 919     }
 920
 921     // -------- User wants to rename a tag or delete it
 922     if (startswith($_SERVER["QUERY_STRING"],'do=changetag'))
 923     {
 924         if (empty($_POST['fromtag']))
 925         {
 926             $token = getToken();
 927             $changetagform = <<<HTML
 928 <form method="POST" action="" name="changetag" style="padding:10 10 10 10;">
 929 <input type="hidden" name="token" value="{$token}">
 930 Tag: <input type="text" name="fromtag" id="fromtag">
 931 <input type="text" name="totag" style="margin-left:40px;"><input type="submit" name="renametag" value="Rename tag" class="bigbutton">
 932 &nbsp;&nbsp;or&nbsp; <input type="submit" name="deletetag" value="Delete tag" class="bigbutton" onClick="return confirmDeleteTag();"><br>(Case sensitive)</form>
 933 <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>
 934 HTML;
 935             $data = array('pageheader'=>$changetagform,'body'=>'','onload'=>'onload="document.changetag.fromtag.focus();"');
 936             templatePage($data);
 937             exit;
 938         }
 939         if (!tokenOk($_POST['token'])) die('Wrong token.');
 940
 941         if (!empty($_POST['deletetag']) && !empty($_POST['fromtag']))
 942         {
 943             $needle=trim($_POST['fromtag']);
 944             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
 945             foreach($linksToAlter as $key=>$value)
 946             {
 947                 $tags = explode(' ',trim($value['tags']));
 948                 unset($tags[array_search($needle,$tags)]); // Remove tag.
 949                 $value['tags']=trim(implode(' ',$tags));
 950                 $LINKSDB[$key]=$value;
 951             }
 952             $LINKSDB->savedb(); // save to disk
 953             invalidateCaches();
 954             echo '<script language="JavaScript">alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
 955             exit;
 956         }
 957
 958         // Rename a tag:
 959         if (!empty($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag']))
 960         {
 961             $needle=trim($_POST['fromtag']);
 962             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
 963             foreach($linksToAlter as $key=>$value)
 964             {
 965                 $tags = explode(' ',trim($value['tags']));
 966                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Remplace tags value.
 967                 $value['tags']=trim(implode(' ',$tags));
 968                 $LINKSDB[$key]=$value;
 969             }
 970             $LINKSDB->savedb(); // save to disk
 971             invalidateCaches();
 972             echo '<script language="JavaScript">alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
 973             exit;
 974         }
 975     }
 976
 977     // -------- User wants to add a link without using the bookmarklet: show form.
 978     if (startswith($_SERVER["QUERY_STRING"],'do=addlink'))
 979     {
 980         $onload = 'onload="document.addform.post.focus();"';
 981         $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>';
 982         $data = array('pageheader'=>$addform,'body'=>'','onload'=>$onload);
 983         templatePage($data);
 984         exit;
 985     }
 986
 987     // -------- User clicked the "Save" button when editing a link: Save link to database.
 988     if (isset($_POST['save_edit']))
 989     {
 990         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away !
 991         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
 992         $linkdate=$_POST['lf_linkdate'];
 993         $link = array('title'=>trim($_POST['lf_title']),'url'=>trim($_POST['lf_url']),'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
 994                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
 995         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
 996         $LINKSDB[$linkdate] = $link;
 997         $LINKSDB->savedb(); // save to disk
 998         invalidateCaches();
 999
1000         // If we are called from the bookmarklet, we must close the popup:
1001         if (isset($_GET['source']) && $_GET['source']=='bookmarklet') { echo '<script language="JavaScript">self.close();</script>'; exit; }
1002         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1003         header('Location: '.$returnurl); // After saving the link, redirect to the page the user was on.
1004         exit;
1005     }
1006
1007     // -------- User clicked the "Cancel" button when editing a link.
1008     if (isset($_POST['cancel_edit']))
1009     {
1010         // If we are called from the bookmarklet, we must close the popup;
1011         if (isset($_GET['source']) && $_GET['source']=='bookmarklet') { echo '<script language="JavaScript">self.close();</script>'; exit; }
1012         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1013         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1014         exit;
1015     }
1016
1017     // -------- User clicked the "Delete" button when editing a link : Delete link from database.
1018     if (isset($_POST['delete_link']))
1019     {
1020         if (!tokenOk($_POST['token'])) die('Wrong token.');
1021         // We do not need to ask for confirmation:
1022         // - confirmation is handled by javascript
1023         // - we are protected from XSRF by the token.
1024         $linkdate=$_POST['lf_linkdate'];
1025         unset($LINKSDB[$linkdate]);
1026         $LINKSDB->savedb(); // save to disk
1027         invalidateCaches();
1028         // If we are called from the bookmarklet, we must close the popup:
1029         if (isset($_GET['source']) && $_GET['source']=='bookmarklet') { echo '<script language="JavaScript">self.close();</script>'; exit; }
1030         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1031         header('Location: '.$returnurl); // After deleting the link, redirect to the page the user was on.
1032         exit;
1033     }
1034
1035     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1036     if (isset($_GET['edit_link']))
1037     {
1038         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1039         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1040         list($editform,$onload)=templateEditForm($link);
1041         $data = array('pageheader'=>$editform,'body'=>'','onload'=>$onload);
1042         templatePage($data);
1043         exit;
1044     }
1045
1046     // -------- User want to post a new link: Display link edit form.
1047     if (isset($_GET['post']))
1048     {
1049         $url=$_GET['post'];
1050
1051         // We remove the annoying parameters added by FeedBurner and GoogleFeedProxy (?utm_source=...)
1052         $i=strpos($url,'&utm_source='); if ($i) $url=substr($url,0,$i);
1053         $i=strpos($url,'?utm_source='); if ($i) $url=substr($url,0,$i);
1054         $i=strpos($url,'#xtor=RSS-'); if ($i) $url=substr($url,0,$i);
1055
1056         $link_is_new = false;
1057         $link = $LINKSDB->getLinkFromUrl($url); // Check if URL is not already in database (in this case, we will edit the existing link)
1058         if (!$link)
1059         {
1060             $link_is_new = true;  // This is a new link
1061             $linkdate = strval(date('Ymd_His'));
1062             $title = (empty($_GET['title']) ? '' : $_GET['title'] ); // Get title if it was provided in URL (by the bookmarklet).
1063             $description=''; $tags=''; $private=0;
1064             if (($url!='') && parse_url($url,PHP_URL_SCHEME)=='') $url = 'http://'.$url;
1065             // 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.)
1066             if (empty($title) && parse_url($url,PHP_URL_SCHEME)=='http')
1067             {
1068                 list($status,$headers,$data) = getHTTP($url,4); // Short timeout to keep the application responsive.
1069                 // FIXME: Decode charset according to specified in either 1) HTTP response headers or 2) <head> in html
1070                 if (strpos($status,'200 OK')) $title=html_entity_decode(html_extract_title($data),ENT_QUOTES,'UTF-8');
1071             }
1072             if ($url=='') $url='?'.smallHash($linkdate); // In case of empty URL, this is just a text (with a link that point to itself)
1073             $link = array('linkdate'=>$linkdate,'title'=>$title,'url'=>$url,'description'=>$description,'tags'=>$tags,'private'=>0);
1074         }
1075         list($editform,$onload)=templateEditForm($link,$link_is_new);
1076         $data = array('pageheader'=>$editform,'body'=>'','onload'=>$onload);
1077         templatePage($data);
1078         exit;
1079     }
1080
1081     // -------- Export as Netscape Bookmarks HTML file.
1082     if (startswith($_SERVER["QUERY_STRING"],'do=export'))
1083     {
1084         if (empty($_GET['what']))
1085         {
1086             $toolbar= <<<HTML
1087 <div id="headerform"><br>
1088     <a href="?do=export&what=all"><b>Export all</b></a> - Export all links<br><br>
1089     <a href="?do=export&what=public"><b>Export public</b></a> - Export public links only<br><br>
1090     <a href="?do=export&what=private"><b>Export private</b></a> - Export private links only<br><br>
1091 </div>
1092 HTML;
1093             $data = array('pageheader'=>$toolbar,'body'=>'','onload'=>'');
1094             templatePage($data);
1095             exit;
1096         }
1097         $exportWhat=$_GET['what'];
1098         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export ???');
1099
1100         header('Content-Type: text/html; charset=utf-8');
1101         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1102         echo <<<HTML
1103 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1104 <!-- This is an automatically generated file.
1105      It will be read and overwritten.
1106      DO NOT EDIT! -->
1107 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1108 <TITLE>Bookmarks</TITLE>
1109 <H1>Bookmarks</H1>
1110 HTML;
1111         foreach($LINKSDB as $link)
1112         {
1113             if ($exportWhat=='all' ||
1114                ($exportWhat=='private' && $link['private']!=0) ||
1115                ($exportWhat=='public' && $link['private']==0))
1116             {
1117                 echo '<DT><A HREF="'.htmlspecialchars($link['url']).'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1118                 if ($link['tags']!='') echo ' TAGS="'.htmlspecialchars(str_replace(' ',',',$link['tags'])).'"';
1119                 echo '>'.htmlspecialchars($link['title'])."</A>\n";
1120                 if ($link['description']!='') echo '<DD>'.htmlspecialchars($link['description'])."\n";
1121             }
1122         }
1123         echo '<!-- Shaarli '.$exportWhat.' bookmarks export on '.date('Y/m/d H:i:s')."-->\n";
1124         exit;
1125     }
1126
1127     // -------- User is uploading a file for import
1128     if (startswith($_SERVER["QUERY_STRING"],'do=upload'))
1129     {
1130         // If file is too big, some form field may be missing.
1131         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1132         {
1133             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1134             echo '<script language="JavaScript">alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.htmlspecialchars($returnurl).'\';</script>';
1135             exit;
1136         }
1137         if (!tokenOk($_POST['token'])) die('Wrong token.');
1138         importFile();
1139         exit;
1140     }
1141
1142     // -------- Show upload/import dialog:
1143     if (startswith($_SERVER["QUERY_STRING"],'do=import'))
1144     {
1145         $token = getToken();
1146         $maxfilesize=getMaxFileSize();
1147         $onload = 'onload="document.uploadform.filetoupload.focus();"';
1148         $uploadform=<<<HTML
1149 <div id="headerform">
1150 Import Netscape html bookmarks (as exported from Firefox/Chrome/Opera/delicious/diigo...) (Max: {$maxfilesize} bytes).
1151 <form method="POST" action="?do=upload" enctype="multipart/form-data" name="uploadform">
1152     <input type="hidden" name="token" value="{$token}">
1153     <input type="file" name="filetoupload" size="80">
1154     <input type="hidden" name="MAX_FILE_SIZE" value="{$maxfilesize}">
1155     <input type="submit" name="import_file" value="Import" class="bigbutton"><br>
1156     <input type="checkbox" name="private">&nbsp;Import all links as private<br>
1157     <input type="checkbox" name="overwrite">&nbsp;Overwrite existing links
1158 </form>
1159 </div>
1160 HTML;
1161         $data = array('pageheader'=>$uploadform,'body'=>'','onload'=>$onload  );
1162         templatePage($data);
1163         exit;
1164     }
1165
1166     // -------- Otherwise, simply display search form and links:
1167     $searchform=<<<HTML
1168 <div id="headerform" style="width:100%; white-space:nowrap;";>
1169     <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>
1170     <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>
1171 </div>
1172 HTML;
1173     $data = array('pageheader'=>$searchform,'body'=>templateLinkList(),'onload'=>'');
1174     templatePage($data);
1175     exit;
1176 }
1177
1178 // -----------------------------------------------------------------------------------------------
1179 // Process the import file form.
1180 function importFile()
1181 {
1182     global $LINKSDB;
1183     $filename=$_FILES['filetoupload']['name'];
1184     $filesize=$_FILES['filetoupload']['size'];
1185     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1186     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private ?
1187     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones ?
1188     $import_count=0;
1189
1190     // Sniff file type:
1191     $type='unknown';
1192     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1193
1194     // Then import the bookmarks.
1195     if ($type=='netscape')
1196     {
1197         // This is a standard Netscape-style bookmark file.
1198         // This format is supported by all browsers (except IE, of course), also delicious, diigo and others.
1199         // I didn't want to use DOM... anyway, this is FAST (less than 1 second to import 7200 links (2.1 Mb html file)).
1200         foreach(explode('<DT>',$data) as $html) // explode is very fast
1201         {
1202             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1203             $d = explode('<DD>',$html);
1204             if (startswith($d[0],'<A '))
1205             {
1206                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1207                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1208                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1209                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1210                 foreach($matches as $m)
1211                 {
1212                     $attr=$m[1]; $value=$m[2];
1213                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1214                     elseif ($attr=='ADD_DATE') $link['linkdate']=date('Ymd_His',intval($value));
1215                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1216                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1217                 }
1218                 if ($link['linkdate']!='' && $link['url']!='' && ($overwrite || empty($LINKSDB[$link['linkdate']])))
1219                 {
1220                     if ($private==1) $link['private']=1;
1221                     $LINKSDB[$link['linkdate']] = $link;
1222                     $import_count++;
1223                 }
1224             }
1225         }
1226         $LINKSDB->savedb();
1227         invalidateCaches();
1228         echo '<script language="JavaScript">alert("File '.$filename.' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1229     }
1230     else
1231     {
1232         echo '<script language="JavaScript">alert("File '.$filename.' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1233     }
1234 }
1235
1236 // -----------------------------------------------------------------------------------------------
1237 /* Template for the edit link form
1238     Input: $link : link to edit (assocative array item as returned by the LINKDB class)
1239 Output: An array : (string) : The html code of the edit link form.
1240                    (string) : The proper onload to use in body.
1241     Example: list($html,$onload)=templateEditForm($mylinkdb['20110805_124532']);
1242              echo $html;
1243 */
1244 function templateEditForm($link,$link_is_new=false)
1245 {
1246     $url=htmlspecialchars($link['url']);
1247     $title=htmlspecialchars($link['title']);
1248     $tags=htmlspecialchars($link['tags']);
1249     $description=htmlspecialchars($link['description']);
1250     $private = ($link['private']==0 ? '' : 'checked="yes"');
1251
1252     // Automatically focus on empty fields:
1253     $onload='onload="document.linkform.lf_tags.focus();"';
1254     if ($description=='') $onload='onload="document.linkform.lf_description.focus();"';
1255     if ($title=='') $onload='onload="document.linkform.lf_title.focus();"';
1256
1257     // Do not show "Delete" button if this is a new link.
1258     $delete_button = '<input type="submit" value="Delete" name="delete_link" class="bigbutton" style="margin-left:180px;" onClick="return confirmDeleteLink();">';
1259     if ($link_is_new) $delete_button='';
1260
1261     $token=getToken(); // XSRF protection.
1262     $returnurl_html = (isset($_SERVER['HTTP_REFERER']) ? '<input type="hidden" name="returnurl" value="'.htmlspecialchars($_SERVER['HTTP_REFERER']).'">' : '');
1263     $editlinkform=<<<HTML
1264 <div id="editlinkform">
1265     <form method="post" name="linkform">
1266         <input type="hidden" name="lf_linkdate" value="{$link['linkdate']}">
1267         <i>URL</i><br><input type="text" name="lf_url" value="{$url}" style="width:100%"><br>
1268         <i>Title</i><br><input type="text" name="lf_title" value="{$title}" style="width:100%"><br>
1269         <i>Description</i><br><textarea name="lf_description" rows="4" cols="25" style="width:100%">{$description}</textarea><br>
1270         <i>Tags</i><br><input type="text" id="lf_tags" name="lf_tags" value="{$tags}" style="width:100%"><br>
1271         <input type="checkbox" {$private} style="margin:7 0 10 0;" name="lf_private">&nbsp;<i>Private</i><br>
1272         <input type="submit" value="Save" name="save_edit" class="bigbutton" style="margin-left:40px;">
1273         <input type="submit" value="Cancel" name="cancel_edit" class="bigbutton" style="margin-left:40px;">
1274         {$delete_button}
1275         <input type="hidden" name="token" value="{$token}">
1276         {$returnurl_html}
1277     </form>
1278 </div>
1279 HTML;
1280     return array($editlinkform,$onload);
1281 }
1282
1283
1284 // -----------------------------------------------------------------------------------------------
1285 // Template for the list of links.
1286 // Returns html code to show the list of link according to parameters passed in URL (search terms, page...)
1287 function templateLinkList()
1288 {
1289     global $LINKSDB;
1290
1291     // Search according to entered search terms:
1292     $linksToDisplay=array();
1293     $searched='';
1294     if (!empty($_GET['searchterm'])) // Fulltext search
1295     {
1296         $linksToDisplay = $LINKSDB->filterFulltext(trim($_GET['searchterm']));
1297         $searched=count($linksToDisplay).' results for <i>'.htmlspecialchars(trim($_GET['searchterm'])).'</i>:';
1298     }
1299     elseif (!empty($_GET['searchtags'])) // Search by tag
1300     {
1301         $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
1302         $tagshtml=''; foreach(explode(' ',trim($_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> ';
1303         $searched=''.count($linksToDisplay).' results for tags '.$tagshtml.':';
1304     }
1305     elseif (preg_match('/[a-zA-Z0-9-_@]{6}/',$_SERVER["QUERY_STRING"])) // Detect smallHashes in URL
1306     {
1307         $linksToDisplay = $LINKSDB->filterSmallHash($_SERVER["QUERY_STRING"]);
1308     }
1309     else
1310         $linksToDisplay = $LINKSDB;  // otherwise, display without filtering.
1311     if ($searched!='') $searched='<div id="searchcriteria">'.$searched.'</div>';
1312     $linklist='';
1313     $actions='';
1314
1315     // Handle paging.
1316     /* Can someone explain to me why you get the following error when using array_keys() on an object which implements the interface ArrayAccess ???
1317        "Warning: array_keys() expects parameter 1 to be array, object given in ... "
1318        If my class implements ArrayAccess, why won't array_keys() accept it ?  ( $keys=array_keys($linksToDisplay); )
1319     */
1320     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; } // Stupid and ugly. Thanks php.
1321
1322     // If there is only a single link, we change on-the-fly the title of the page.
1323     if (count($linksToDisplay)==1) $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1324
1325     $pagecount = ceil(count($keys)/$_SESSION['LINKS_PER_PAGE']);
1326     $pagecount = ($pagecount==0 ? 1 : $pagecount);
1327     $page=( empty($_GET['page']) ? 1 : intval($_GET['page']));
1328     $page = ( $page<1 ? 1 : $page );
1329     $page = ( $page>$pagecount ? $pagecount : $page );
1330     $i = ($page-1)*$_SESSION['LINKS_PER_PAGE']; // Start index.
1331     $end = $i+$_SESSION['LINKS_PER_PAGE'];
1332     $redir = empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector']; // optional redirector URL
1333
1334     while ($i<$end && $i<count($keys))
1335     {
1336         $link = $linksToDisplay[$keys[$i]];
1337         $description=text2clickable(htmlspecialchars($link['description']));
1338         $title=$link['title'];
1339         $classprivate = ($link['private']==0 ? '' : 'class="private"');
1340         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>';
1341         $tags='';
1342         if ($link['tags']!='')
1343         {
1344             foreach(explode(' ',$link['tags']) as $tag) { $tags.='<span class="linktag" title="Add tag"><a href="?addtag='.htmlspecialchars($tag).'">'.htmlspecialchars($tag).'</a></span> '; }
1345             $tags='<div class="linktaglist">'.$tags.'</div>';
1346         }
1347         $linklist.='<li '.$classprivate.'>'.thumbnail($link['url']);
1348         $linklist.='<div class="linkcontainer"><span class="linktitle"><a href="'.$redir.htmlspecialchars($link['url']).'">'.htmlspecialchars($title).'</a></span>'.$actions.'<br>';
1349         if ($description!='') $linklist.='<div class="linkdescription">'.nl2br($description).'</div><br>';
1350         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $linklist.='<span class="linkdate" title="Short link here"><a href="?'.smallHash($link['linkdate']).'">'.htmlspecialchars(linkdate2locale($link['linkdate'])).' </a> - </span>';
1351         else $linklist.='<span class="linkdate" title="Short link here"><a href="?'.smallHash($link['linkdate']).'">link</a> - </span>';
1352         $linklist.='<span class="linkurl" title="Short link">'.htmlspecialchars($link['url']).'</span><br>'.$tags."</div></li>\n";
1353         $i++;
1354     }
1355
1356     // Show paging.
1357     $searchterm= ( empty($_GET['searchterm']) ? '' : '&searchterm='.$_GET['searchterm'] );
1358     $searchtags= ( empty($_GET['searchtags']) ? '' : '&searchtags='.$_GET['searchtags'] );
1359     $paging='';
1360     if ($i!=count($keys)) $paging.='<a href="?page='.($page+1).$searchterm.$searchtags.'">&#x25C4;Older</a>';
1361     $paging.= '<span style="color:#fff; padding:0 20 0 20;">page '.$page.' / '.$pagecount.'</span>';
1362     if ($page>1) $paging.='<a href="?page='.($page-1).$searchterm.$searchtags.'">Newer&#x25BA;</a>';
1363     $linksperpage = <<<HTML
1364 <div style="float:right; padding-right:5px;">
1365 Links per page: <a href="?linksperpage=20">20</a> <a href="?linksperpage=50">50</a> <a href="?linksperpage=100">100</a>
1366  <form method="GET" style="display:inline;"><input type="text" name="linksperpage" size="2" style="height:15px;"></form></div>
1367 HTML;
1368     $paging = '<div class="paging">'.$linksperpage.$paging.'</div>';
1369     $linklist='<div id="linklist">'.$paging.$searched.'<ul>'.$linklist.'</ul>'.$paging.'</div>';
1370     return $linklist;
1371 }
1372
1373 // Returns the HTML code to display a thumbnail for a link.
1374 // Understands various services (youtube.com...)
1375 function thumbnail($url)
1376 {
1377     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return '';
1378
1379     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1380     // (eg. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1381     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1382     $domain = parse_url($url,PHP_URL_HOST);
1383     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1384     {
1385         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1386         if (!empty($params['v'])) return '<div class="thumbnail"><a href="'.htmlspecialchars($url).'"><img src="http://img.youtube.com/vi/'.htmlspecialchars($params['v']).'/default.jpg" width="120" height="90"></a></div>';
1387     }
1388     if ($domain=='imgur.com')
1389     {
1390         $path = parse_url($url,PHP_URL_PATH);
1391         if (substr_count($path,'/')==1) return '<div class="thumbnail"><a href="'.htmlspecialchars($url).'"><img src="http://i.imgur.com/'.htmlspecialchars(substr($path,1)).'s.jpg" width="90" height="90"></a></div>';
1392         if (strpos($path,'/gallery/')==0) return '<div class="thumbnail"><a href="'.htmlspecialchars($url).'"><img src="http://i.imgur.com'.htmlspecialchars(substr($path,8)).'s.jpg" width="90" height="90"></a></div>';
1393     }
1394     if ($domain=='i.imgur.com')
1395     {
1396         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1397         if (!empty($pi['filename'])) return '<div class="thumbnail"><a href="'.htmlspecialchars($url).'"><img src="http://i.imgur.com/'.htmlspecialchars($pi['filename']).'s.jpg" width="90" height="90"></a></div>';
1398     }
1399     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1400     {
1401         if (strpos($url,'dailymotion.com/video/'))
1402         {
1403             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1404             return '<div class="thumbnail"><a href="'.htmlspecialchars($url).'"><img src="'.htmlspecialchars($thumburl).'" width="120" style="height:auto;"></a></div>';
1405         }
1406     }
1407     if (endsWith($domain,'.imageshack.us'))
1408     {
1409         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1410         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1411         {
1412             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1413             return '<div class="thumbnail"><a href="'.htmlspecialchars($url).'"><img src="'.htmlspecialchars($thumburl).'" width="120" style="height:auto;"></a></div>';
1414         }
1415     }
1416
1417
1418     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1419     // So we deport the thumbnail generation in order not to slow down page generation
1420     // (and we also cache the thumbnail)
1421
1422     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return ''; // If local cache is disabled, no thumbnails for services which require the use a local cache.
1423
1424     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com') || $domain=='vimeo.com')
1425     {
1426         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1427         return '<div class="thumbnail"><a href="'.htmlspecialchars($url).'"><img src="?do=genthumbnail&hmac='.htmlspecialchars($sign).'&url='.urlencode($url).'" width="120" style="height:auto;"></a></div>';
1428     }
1429
1430     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1431     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1432     // But using the extension will do.
1433     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1434     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1435     {
1436         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1437         return '<div class="thumbnail"><a href="'.htmlspecialchars($url).'"><img src="?do=genthumbnail&hmac='.htmlspecialchars($sign).'&url='.urlencode($url).'" width="120" style="height:auto;"></a></div>';
1438     }
1439     return ''; // No thumbnail.
1440
1441 }
1442
1443 // -----------------------------------------------------------------------------------------------
1444 // Template for the whole page.
1445 /* Input: $data (associative array).
1446                 Keys: 'body' : body of HTML document
1447                       'pageheader' : html code to show in page header (top of page)
1448                       'onload' : optional onload javascript for the <body>
1449 */
1450 function templatePage($data)
1451 {
1452     global $STARTTIME;
1453     global $LINKSDB;
1454     $shaarli_version = shaarli_version;
1455
1456     $newversion=checkUpdate();
1457     if ($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>';
1458     $linkcount = count($LINKSDB);
1459     $open='';
1460     if ($GLOBALS['config']['OPEN_SHAARLI'])
1461     {
1462         $menu=' <a href="?do=tools">Tools</a> &nbsp;<a href="?do=addlink"><b>Add link</b></a>';
1463         $open='Open ';
1464     }
1465     else
1466         $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>');
1467
1468     foreach(array('pageheader','body','onload') as $k) // make sure all required fields exist (put an empty string if not).
1469     {
1470         if (!array_key_exists($k,$data)) $data[$k]='';
1471     }
1472     $jsincludes=''; $jsincludes_bottom = '';
1473     if ($GLOBALS['config']['OPEN_SHAARLI'] || isLoggedIn())
1474     {
1475         $source = serverUrl().$_SERVER['SCRIPT_NAME'];
1476         $jsincludes='<script language="JavaScript" src="jquery.min.js"></script><script language="JavaScript" src="jquery-ui.custom.min.js"></script>';
1477         $jsincludes_bottom = <<<JS
1478 <script language="JavaScript">
1479 $(document).ready(function()
1480 {
1481     $('#lf_tags').autocomplete({source:'{$source}?ws=tags',minLength:1});
1482     $('#searchtags').autocomplete({source:'{$source}?ws=tags',minLength:1});
1483     $('#fromtag').autocomplete({source:'{$source}?ws=singletag',minLength:1});
1484 });
1485 </script>
1486 JS;
1487     }
1488     $feedurl=htmlspecialchars(serverUrl().$_SERVER['SCRIPT_NAME']);
1489     $feedsearch='';
1490     if (!empty($_GET['searchtags'])) $feedsearch.='&searchtags='.$_GET['searchtags'];
1491     elseif (!empty($_GET['searchterm'])) $feedsearch.='&searchterm='.$_GET['searchterm'];
1492     $filtered_feed= ($feedsearch=='' ? '' : 'Filtered ');
1493     $version=shaarli_version;
1494
1495     $title = htmlspecialchars( $GLOBALS['title'] );
1496     $pagetitle = htmlspecialchars( empty($GLOBALS['pagetitle']) ? $title : $GLOBALS['pagetitle'] );
1497     echo <<<HTML
1498 <html>
1499 <head>
1500 <title>{$pagetitle}</title>
1501 <link rel="alternate" type="application/rss+xml" href="{$feedurl}?do=rss{$feedsearch}" title="{$filtered_feed}RSS Feed" />
1502 <link rel="alternate" type="application/atom+xml" href="{$feedurl}?do=atom{$feedsearch}" title="{$filtered_feed}ATOM Feed" />
1503 <link type="text/css" rel="stylesheet" href="shaarli.css?version={$version}" />
1504 {$jsincludes}
1505 </head>
1506 <body {$data['onload']}>{$newversion}
1507 <div id="pageheader"><div style="float:right; font-style:italic; color:#bbb; text-align:right; padding:0 5 0 0;">Shaare your links...<br>{$linkcount} links</div>
1508     <span id="shaarli_title"><a href="?">{$title}</a></span> - <a href="?">Home</a>&nbsp;{$menu}&nbsp;<a href="{$feedurl}?do=rss{$feedsearch}" style="padding-left:30px;">RSS Feed</a> <a href="{$feedurl}?do=atom{$feedsearch}" style="padding-left:10px;">ATOM Feed</a>
1509 &nbsp;&nbsp; <a href="?do=tagcloud">Tag cloud</a>
1510 {$data['pageheader']}
1511 </div>
1512 {$data['body']}
1513
1514 HTML;
1515     $exectime = round(microtime(true)-$STARTTIME,4);
1516     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>';
1517     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>';
1518     echo $jsincludes_bottom.'</body></html>';
1519 }
1520
1521 // -----------------------------------------------------------------------------------------------
1522 // Installation
1523 // This function should NEVER be called if the file data/config.php exists.
1524 function install()
1525 {
1526     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
1527     if (endsWith($_SERVER['SERVER_NAME'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
1528
1529     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
1530     {
1531         $tz = 'UTC';
1532         if (!empty($_POST['continent']) && !empty($_POST['city']))
1533             if (isTZvalid($_POST['continent'],$_POST['city']))
1534                 $tz = $_POST['continent'].'/'.$_POST['city'];
1535         $GLOBALS['timezone'] = $tz;
1536         // Everything is ok, let's create config file.
1537         $GLOBALS['login'] = $_POST['setlogin'];
1538         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1539         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1540         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.htmlspecialchars(serverUrl().$_SERVER['SCRIPT_NAME']) : $_POST['title'] );
1541         writeConfig();
1542         echo '<script language="JavaScript">alert("Shaarli is now configured. Please enter your login/password and start shaaring your links !");document.location=\'?do=login\';</script>';
1543         exit;
1544     }
1545
1546     // Display config form:
1547     list($timezone_form,$timezone_js) = templateTZform();
1548     $timezone_html=''; if ($timezone_form!='') $timezone_html='<tr><td valign="top"><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
1549     echo <<<HTML
1550 <html><head><title>Shaarli - Configuration</title><link type="text/css" rel="stylesheet" href="shaarli.css" />${timezone_js}</head>
1551 <body onload="document.installform.setlogin.focus();" style="padding:20px;"><h1>Shaarli - Shaare your links...</h1>
1552 It looks like it's the first time you run Shaarli. Please configure it:<br>
1553 <form method="POST" action="" name="installform" id="installform" style="border:1px solid black; padding:10 10 10 10;">
1554 <table border="0" cellpadding="20">
1555 <tr><td><b>Login:</b></td><td><input type="text" name="setlogin" size="30"></td></tr>
1556 <tr><td><b>Password:</b></td><td><input type="password" name="setpassword" size="30"></td></tr>
1557 {$timezone_html}
1558 <tr><td><b>Page title:</b></td><td><input type="text" name="title" size="30"></td></tr>
1559 <tr><td></td><td align="right"><input type="submit" name="Save" value="Save config" class="bigbutton"></td></tr>
1560 </table>
1561 </form></body></html>
1562 HTML;
1563     exit;
1564 }
1565
1566 // Generates the timezone selection form and javascript.
1567 // Input: (optional) current timezone (can be 'UTC/UTC'). It will be pre-selected.
1568 // Output: array(html,js)
1569 // Example: list($htmlform,$js) = templateTZform('Europe/Paris');  // Europe/Paris pre-selected.
1570 // Returns array('','') if server does not support timezones list. (eg. php 5.1 on free.fr)
1571 function templateTZform($ptz=false)
1572 {
1573     if (function_exists('timezone_identifiers_list')) // because of old php version (5.1) which can be found on free.fr
1574     {
1575         // Try to split the provided timezone.
1576         if ($ptz==false) { $l=timezone_identifiers_list(); $ptz=$l[0]; }
1577         $spos=strpos($ptz,'/'); $pcontinent=substr($ptz,0,$spos); $pcity=substr($ptz,$spos+1);
1578
1579         // Display config form:
1580         $timezone_form = '';
1581         $timezone_js = '';
1582         // The list is in the forme "Europe/Paris", "America/Argentina/Buenos_Aires"...
1583         // We split the list in continents/cities.
1584         $continents = array();
1585         $cities = array();
1586         foreach(timezone_identifiers_list() as $tz)
1587         {
1588             if ($tz=='UTC') $tz='UTC/UTC';
1589             $spos = strpos($tz,'/');
1590             if ($spos)
1591             {
1592                 $continent=substr($tz,0,$spos); $city=substr($tz,$spos+1);
1593                 $continents[$continent]=1;
1594                 if (!isset($cities[$continent])) $cities[$continent]=array();
1595                 $cities[$continent].='<option value="'.$city.'"'.($pcity==$city?'selected':'').'>'.$city.'</option>';
1596             }
1597         }
1598         $continents_html = '';
1599         $continents = array_keys($continents);
1600         foreach($continents as $continent)
1601             $continents_html.='<option  value="'.$continent.'"'.($pcontinent==$continent?'selected':'').'>'.$continent.'</option>';
1602         $cities_html = $cities[$pcontinent];
1603         $timezone_form = "Continent: <select name=\"continent\" id=\"continent\" onChange=\"onChangecontinent();\">${continents_html}</select><br /><br />";
1604         $timezone_form .= "City: <select name=\"city\" id=\"city\">${cities[$pcontinent]}</select><br /><br />";
1605         $timezone_js = "<script language=\"JavaScript\">";
1606         $timezone_js .= "function onChangecontinent(){document.getElementById(\"city\").innerHTML = citiescontinent[document.getElementById(\"continent\").value];}";
1607         $timezone_js .= "var citiescontinent = ".json_encode($cities).";" ;
1608         $timezone_js .= "</script>" ;
1609         return array($timezone_form,$timezone_js);
1610     }
1611     return array('','');
1612 }
1613
1614 // Tells if a timezone is valid or not.
1615 // If not valid, returns false.
1616 // If system does not support timezone list, returns false.
1617 function isTZvalid($continent,$city)
1618 {
1619     $tz = $continent.'/'.$city;
1620     if (function_exists('timezone_identifiers_list')) // because of old php version (5.1) which can be found on free.fr
1621     {
1622         if (in_array($tz, timezone_identifiers_list())) // it's a valid timezone ?
1623                     return true;
1624     }
1625     return false;
1626 }
1627
1628
1629 // Webservices (for use with jQuery/jQueryUI)
1630 // eg.  index.php?ws=tags&term=minecr
1631 function processWS()
1632 {
1633     if (empty($_GET['ws']) || empty($_GET['term'])) return;
1634     $term = $_GET['term'];
1635     global $LINKSDB;
1636     header('Content-Type: application/json; charset=utf-8');
1637
1638     // Search in tags (case insentitive, cumulative search)
1639     if ($_GET['ws']=='tags')
1640     {
1641         $tags=explode(' ',str_replace(',',' ',$term)); $last = array_pop($tags); // Get the last term ("a b c d" ==> "a b c", "d")
1642         $addtags=''; if ($tags) $addtags=implode(' ',$tags).' '; // We will pre-pend previous tags
1643         $suggested=array();
1644         /* To speed up things, we store list of tags in session */
1645         if (empty($_SESSION['tags'])) $_SESSION['tags'] = $LINKSDB->allTags();
1646         foreach($_SESSION['tags'] as $key=>$value)
1647         {
1648             if (startsWith($key,$last,$case=false) && !in_array($key,$tags)) $suggested[$addtags.$key.' ']=0;
1649         }
1650         echo json_encode(array_keys($suggested));
1651         exit;
1652     }
1653
1654     // Search a single tag (case sentitive, single tag search)
1655     if ($_GET['ws']=='singletag')
1656     {
1657         /* To speed up things, we store list of tags in session */
1658         if (empty($_SESSION['tags'])) $_SESSION['tags'] = $LINKSDB->allTags();
1659         foreach($_SESSION['tags'] as $key=>$value)
1660         {
1661             if (startsWith($key,$term,$case=true)) $suggested[$key]=0;
1662         }
1663         echo json_encode(array_keys($suggested));
1664         exit;
1665     }
1666 }
1667
1668 // Re-write configuration file according to globals.
1669 // Requires some $GLOBALS to be set (login,hash,salt,title).
1670 // If the config file cannot be saved, an error message is dislayed and the user is redirected to "Tools" menu.
1671 // (otherwise, the function simply returns.)
1672 function writeConfig()
1673 {
1674     if (is_file($GLOBALS['config']['CONFIG_FILE']) && !isLoggedIn()) die('You are not authorized to alter config.'); // Only logged in user can alter config.
1675     if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
1676     $config='<?php $GLOBALS[\'login\']='.var_export($GLOBALS['login'],true).'; $GLOBALS[\'hash\']='.var_export($GLOBALS['hash'],true).'; $GLOBALS[\'salt\']='.var_export($GLOBALS['salt'],true).'; ';
1677     $config .='$GLOBALS[\'timezone\']='.var_export($GLOBALS['timezone'],true).'; date_default_timezone_set('.var_export($GLOBALS['timezone'],true).'); $GLOBALS[\'title\']='.var_export($GLOBALS['title'],true).';';
1678     $config .= '$GLOBALS[\'redirector\']='.var_export($GLOBALS['redirector'],true).'; ';
1679     $config .= ' ?>';
1680     if (!file_put_contents($GLOBALS['config']['CONFIG_FILE'],$config) || strcmp(file_get_contents($GLOBALS['config']['CONFIG_FILE']),$config)!=0)
1681     {
1682         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>';
1683         exit;
1684     }
1685 }
1686
1687 /* Because some f*cking services like Flickr require an extra HTTP request to get the thumbnail URL,
1688    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
1689    The following function takes the URL a link (eg. a flickr page) and return the proper thumbnail.
1690    This function is called by passing the url:
1691    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
1692    [URL] is the URL of the link (eg. a flickr page)
1693    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
1694    The function below will fetch the image from the webservice and store it in the cache.
1695 */
1696 function genThumbnail()
1697 {
1698     // Make sure the parameters in the URL were generated by us.
1699     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
1700     if ($sign!=$_GET['hmac']) die('Naughty boy !');
1701
1702     // Let's see if we don't already have the image for this URL in the cache.
1703     $thumbname=hash('sha1',$_GET['url']).'.jpg';
1704     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
1705     {   // We have the thumbnail, just serve it:
1706         header('Content-Type: image/jpeg');
1707         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
1708         return;
1709     }
1710     // We may also serve a blank image (if service did not respond)
1711     $blankname=hash('sha1',$_GET['url']).'.gif';
1712     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
1713     {
1714         header('Content-Type: image/gif');
1715         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
1716         return;
1717     }
1718
1719     // Otherwise, generate the thumbnail.
1720     $url = $_GET['url'];
1721     $domain = parse_url($url,PHP_URL_HOST);
1722
1723     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
1724     {
1725         // WTF ? I need a flickr API key to get a fucking thumbnail ? No way.
1726         // I'll extract the thumbnail URL myself. First, we have to get the flickr HTML page.
1727         // All images in Flickr are in the form:
1728         // http://farm[farm].static.flickr.com/[server]/[id]_[secret]_[size].jpg
1729         // Example: http://farm7.static.flickr.com/6205/6088513739_fc158467fe_z.jpg
1730         // We want the 240x120 format, which is _m.jpg.
1731         // We search for the first image in the page which does not have the _s size,
1732         // when use the _m to get the thumbnail.
1733
1734         // Is this a link to an image, or to a flickr page ?
1735         $imageurl='';
1736         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
1737         {  // This is a direct link to an image. eg. http://farm1.static.flickr.com/5/5921913_ac83ed27bd_o.jpg
1738             preg_match('!(http://farm\d+.static.flickr.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
1739             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
1740         }
1741         else // this is a flickr page (html)
1742         {
1743             list($httpstatus,$headers,$data) = getHTTP($url,20); // Get the flickr html page.
1744             if (strpos($httpstatus,'200 OK'))
1745             {
1746                 preg_match('!(http://farm\d+.static.flickr.com/\d+/\d+_\w+_)[^s].jpg!',$data,$matches);
1747                 if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
1748             }
1749         }
1750         if ($imageurl!='')
1751         {   // Let's download the image.
1752             list($httpstatus,$headers,$data) = getHTTP($imageurl,10); // Image is 240x120, so 10 seconds to download should be enough.
1753             if (strpos($httpstatus,'200 OK'))
1754             {
1755                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
1756                 header('Content-Type: image/jpeg');
1757                 echo $data;
1758                 return;
1759             }
1760         }
1761     }
1762
1763     if ($domain=='vimeo.com' )
1764     {
1765         // This is more complex: we have to perform a HTTP request, then parse the result.
1766         // Maybe we should deport this to javascript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
1767         $vid = substr(parse_url($url,PHP_URL_PATH),1);
1768         list($httpstatus,$headers,$data) = getHTTP('http://vimeo.com/api/v2/video/'.htmlspecialchars($vid).'.php',5);
1769         if (strpos($httpstatus,'200 OK'))
1770         {
1771             $t = unserialize($data);
1772             $imageurl = $t[0]['thumbnail_medium'];
1773             // Then we download the image and serve it to our client.
1774             list($httpstatus,$headers,$data) = getHTTP($imageurl,10);
1775             if (strpos($httpstatus,'200 OK'))
1776             {
1777                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
1778                 header('Content-Type: image/jpeg');
1779                 echo $data;
1780                 return;
1781             }
1782         }
1783     }
1784
1785     // For all other domains, we try to download the image and make a thumbnail.
1786     list($httpstatus,$headers,$data) = getHTTP($url,30);  // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
1787     if (strpos($httpstatus,'200 OK'))
1788     {
1789         $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
1790         file_put_contents($filepath,$data); // Save image to cache.
1791         if (resizeImage($filepath))
1792         {
1793             header('Content-Type: image/jpeg');
1794             echo file_get_contents($filepath);
1795             return;
1796         }
1797     }
1798
1799
1800     // Otherwise, return an empty image (8x8 transparent gif)
1801     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
1802     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
1803     header('Content-Type: image/gif');
1804     echo $blankgif;
1805 }
1806
1807 // Make a thumbnail of the image (to width: 120 pixels)
1808 // Returns true if success, false otherwise.
1809 function resizeImage($filepath)
1810 {
1811     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
1812
1813     // Trick: some stupid people rename GIF as JPEG... or else.
1814     // So we really try to open each image type whatever the extension is.
1815     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
1816     $im=false;
1817     if (strpos($header,'GIF8')==0) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
1818     if (strpos($header,'PNG')==1) $im = imagecreatefrompng($filepath);
1819     if (strpos($header,'JFIF')) $im = imagecreatefromjpeg($filepath);
1820     if (!$im) return false;  // Unable to open image (corrupted or not an image)
1821     $w = imagesx($im);
1822     $h = imagesy($im);
1823     $ystart = 0; $yheight=$h;
1824     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
1825     $nw = 120;   // Desired width
1826     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
1827     // Resize image:
1828     $im2 = imagecreatetruecolor($nw,$nh);
1829     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
1830     imageinterlace($im2,true); // For progressive JPEG.
1831     $tempname=$filepath.'_TEMP.jpg';
1832     imagejpeg($im2, $tempname, 90);
1833     imagedestroy($im);
1834     imagedestroy($im2);
1835     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
1836     return true;
1837 }
1838
1839 // Invalidate caches when the database is changed or the user logs out.
1840 // (eg. tags cache).
1841 function invalidateCaches()
1842 {
1843     unset($_SESSION['tags']);
1844 }
1845
1846 if (startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
1847 $LINKSDB=new linkdb(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI']);  // Read links from database (and filter private links if used it not logged in).
1848 if (startswith($_SERVER["QUERY_STRING"],'ws=')) { processWS(); exit; } // Webservices (for jQuery/jQueryUI)
1849 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
1850 if (startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
1851 if (startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
1852 renderPage();
1853 ?>