index.php

   1 <?php
   2 // Shaarli 0.0.13 beta - Shaare your links...
   3 // The personal, minimalist, super-fast, no-database delicious clone. By sebsauvage.net
   4 // http://sebsauvage.net/wiki/doku.php?id=php:shaarli
   5 // Licence: http://www.opensource.org/licenses/zlib-license.php
   6
   7 // Requires: php 5.1.x
   8
   9 // -----------------------------------------------------------------------------------------------
  10 // User config:
  11 define('DATADIR','data'); // Data subdirectory
  12 define('CONFIG_FILE',DATADIR.'/config.php'); // Configuration file (user login/password)
  13 define('DATASTORE',DATADIR.'/datastore.php'); // Data storage file.
  14 define('LINKS_PER_PAGE',20); // Default links per page.
  15 define('IPBANS_FILENAME',DATADIR.'/ipbans.php'); // File storage for failures and bans.
  16 define('BAN_AFTER',4);       // Ban IP after this many failures.
  17 define('BAN_DURATION',1800); // Ban duration for IP address after login failures (in seconds) (1800 sec. = 30 minutes)
  18 define('OPEN_SHAARLI',false); // If true, anyone can add/edit/delete links without having to login
  19
  20
  21 // -----------------------------------------------------------------------------------------------
  22 // Program config (touch at your own risks !)
  23 if (get_magic_quotes_gpc())
  24 {
  25     header('Content-Type: text/plain; charset=utf-8');
  26     echo "ERROR: magic_quotes_gpc is ON in your php config. This is *BAD*. You *MUST* disable it, either by changing the value in php.ini,\n";
  27     echo "or by adding ONE the following line in .htaccess (depending on your host):\n\nphp_flag magic_quotes_gpc Off\nor\nSetEnv MAGIC_QUOTES 0"; exit;
  28 }
  29 checkphpversion();
  30 error_reporting(E_ALL^E_WARNING);  // See all error except warnings.
  31 //error_reporting(-1); // See all errors (for debugging only)
  32 $STARTTIME = microtime(true);  // Measure page execution time.
  33 ob_start();
  34 // Prevent caching: (yes, it's ugly)
  35 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
  36 header("Cache-Control: no-store, no-cache, must-revalidate");
  37 header("Cache-Control: post-check=0, pre-check=0", false);
  38 header("Pragma: no-cache");
  39 define('shaarli_version','0.0.13 beta');
  40 if (!is_dir(DATADIR)) { mkdir(DATADIR,0705); chmod(DATADIR,0705); }
  41 if (!is_file(DATADIR.'/.htaccess')) { file_put_contents(DATADIR.'/.htaccess',"Allow from none\nDeny from all\n"); } // Protect data files.
  42 if (!is_file(CONFIG_FILE)) install();
  43 require CONFIG_FILE;  // Read login/password hash into $GLOBALS.
  44 ini_set('max_input_time','60');  // High execution time in case of problematic imports/exports.
  45 ini_set('memory_limit', '128M');  // Try to set max upload file size and read (May not work on some hosts).
  46 ini_set('post_max_size', '16M');
  47 ini_set('upload_max_filesize', '16M');
  48 define('PHPPREFIX','<?php /* '); // Prefix to encapsulate data in php code.
  49 define('PHPSUFFIX',' */ ?>'); // Suffix to encapsulate data in php code.
  50 autoLocale(); // Sniff browser language and set date format accordingly.
  51 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
  52 $LINKSDB=false;
  53
  54 // Check php version
  55 function checkphpversion()
  56 {
  57     $ver=phpversion();
  58     if (preg_match('!(\d+)\.(\d+)\.(\d+)!',$ver,$matches)) // (because phpversion() sometimes returns strings like "5.2.4-2ubuntu5.2")
  59     {
  60         list($match,$major,$minor,$release) = $matches;
  61         if ($major>=5 && $minor>=1) return; // 5.1.x or higher is ok.
  62         header('Content-Type: text/plain; charset=utf-8');
  63         echo 'Your server supports php '.$ver.'. Shaarli requires at last php 5.1, and thus cannot run. Sorry.';
  64         exit;
  65     }
  66     // if cannot check php version... well, at your own risks.
  67 }
  68
  69 // -----------------------------------------------------------------------------------------------
  70 // Log to text file
  71 function logm($message)
  72 {
  73     if (!file_exists(DATADIR.'/log.txt')) {$logFile = fopen(DATADIR.'/log.txt','w'); }
  74     else { $logFile = fopen(DATADIR.'/log.txt','a'); }
  75     fwrite($logFile,strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n");
  76     fclose($logFile);
  77 }
  78
  79 // ------------------------------------------------------------------------------------------
  80 // Sniff browser language to display dates in the right format automatically.
  81 // (Note that is may not work on your server if the corresponding local is not installed.)
  82 function autoLocale()
  83 {
  84     $loc='en_US'; // Default if browser does not send HTTP_ACCEPT_LANGUAGE
  85     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // eg. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
  86     {   // (It's a bit crude, but it works very well. Prefered language is always presented first.)
  87         if (preg_match('/([a-z]{2}(-[a-z]{2})?)/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) $loc=$matches[1];
  88     }
  89     setlocale(LC_TIME,$loc);  // LC_TIME = Set local for date/time format only.
  90 }
  91
  92 // ------------------------------------------------------------------------------------------
  93 // Session management
  94 define('INACTIVITY_TIMEOUT',3600); // (in seconds). If the user does not access any page within this time, his/her session is considered expired.
  95 ini_set('session.use_cookies', 1);       // Use cookies to store session.
  96 ini_set('session.use_only_cookies', 1);  // Force cookies for session (phpsessionID forbidden in URL)
  97 ini_set('session.use_trans_sid', false); // Prevent php to use sessionID in URL if cookies are disabled.
  98 session_name('shaarli');
  99 session_start();
 100
 101 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 102 function allIPs()
 103 {
 104     $ip = $_SERVER["REMOTE_ADDR"];
 105     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 106     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 107     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 108     return $ip;
 109 }
 110
 111 // Check that user/password is correct.
 112 function check_auth($login,$password)
 113 {
 114     $hash = sha1($password.$login.$GLOBALS['salt']);
 115     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 116     {   // Login/password is correct.
 117         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // generate unique random number (different than phpsessionid)
 118         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 119         $_SESSION['username']=$login;
 120         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 121         logm('Login successful');
 122         return True;
 123     }
 124     logm('Login failed for user '.$login);
 125     return False;
 126 }
 127
 128 // Returns true if the user is logged in.
 129 function isLoggedIn()
 130 {
 131     if (OPEN_SHAARLI) return true;
 132
 133     // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 134     if (empty($_SESSION['uid']) || $_SESSION['ip']!=allIPs() || time()>=$_SESSION['expires_on'])
 135     {
 136         logout();
 137         return false;
 138     }
 139     $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // User accessed a page : Update his/her session expiration date.
 140     return true;
 141 }
 142
 143 // Force logout.
 144 function logout() { unset($_SESSION['uid']); unset($_SESSION['ip']); unset($_SESSION['username']);}
 145
 146
 147 // ------------------------------------------------------------------------------------------
 148 // Brute force protection system
 149 // Several consecutive failed logins will ban the IP address for 30 minutes.
 150 if (!is_file(IPBANS_FILENAME)) file_put_contents(IPBANS_FILENAME, "<?php\n\$GLOBALS['IPBANS']=".var_export(array('FAILURES'=>array(),'BANS'=>array()),true).";\n?>");
 151 include IPBANS_FILENAME;
 152 // Signal a failed login. Will ban the IP if too many failures:
 153 function ban_loginFailed()
 154 {
 155     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 156     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 157     $gb['FAILURES'][$ip]++;
 158     if ($gb['FAILURES'][$ip]>(BAN_AFTER-1))
 159     {
 160         $gb['BANS'][$ip]=time()+BAN_DURATION;
 161         logm('IP address banned from login');
 162     }
 163     $GLOBALS['IPBANS'] = $gb;
 164     file_put_contents(IPBANS_FILENAME, "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 165 }
 166
 167 // Signals a successful login. Resets failed login counter.
 168 function ban_loginOk()
 169 {
 170     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 171     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 172     $GLOBALS['IPBANS'] = $gb;
 173     file_put_contents(IPBANS_FILENAME, "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 174 }
 175
 176 // Checks if the user CAN login. If 'true', the user can try to login.
 177 function ban_canLogin()
 178 {
 179     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 180     if (isset($gb['BANS'][$ip]))
 181     {
 182         // User is banned. Check if the ban has expired:
 183         if ($gb['BANS'][$ip]<=time())
 184         {   // Ban expired, user can try to login again.
 185             logm('Ban lifted.');
 186             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 187             file_put_contents(IPBANS_FILENAME, "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 188             return true; // Ban has expired, user can login.
 189         }
 190         return false; // User is banned.
 191     }
 192     return true; // User is not banned.
 193 }
 194
 195 // ------------------------------------------------------------------------------------------
 196 // Process login form: Check if login/password is correct.
 197 if (isset($_POST['login']))
 198 {
 199     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 200     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 201     {   // Login/password is ok.
 202         ban_loginOk();
 203         // Optional redirect after login:
 204         if (isset($_GET['post'])) { header('Location: ?post='.urlencode($_GET['post']).(!empty($_GET['source'])?'&source='.urlencode($_GET['source']):'')); exit; }
 205         if (isset($_POST['returnurl'])) { header('Location: '.$_POST['returnurl']); exit; }
 206         header('Location: ?'); exit;
 207     }
 208     else
 209     {
 210         ban_loginFailed();
 211         echo '<script language="JavaScript">alert("Wrong login/password.");document.location=\'?do=login\';</script>'; // Redirect to login screen.
 212         exit;
 213     }
 214 }
 215
 216 // ------------------------------------------------------------------------------------------
 217 // Misc utility functions:
 218
 219 // Returns the server URL (including port and http/https), without path.
 220 // eg. "http://myserver.com:8080"
 221 // You can append $_SERVER['SCRIPT_NAME'] to get the current script URL.
 222 function serverUrl()
 223 {
 224         $serverport = ($_SERVER["SERVER_PORT"]!='80' ? ':'.$_SERVER["SERVER_PORT"] : '');
 225         return 'http'.(!empty($_SERVER['HTTPS'])?'s':'').'://'.$_SERVER["SERVER_NAME"].$serverport;
 226 }
 227
 228 // Convert post_max_size/upload_max_filesize (eg.'16M') parameters to bytes.
 229 function return_bytes($val)
 230 {
 231     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 232     switch($last)
 233     {
 234         case 'g': $val *= 1024;
 235         case 'm': $val *= 1024;
 236         case 'k': $val *= 1024;
 237     }
 238     return $val;
 239 }
 240
 241 // Try to determine max file size for uploads (POST).
 242 // Returns an integer (in bytes)
 243 function getMaxFileSize()
 244 {
 245     $size1 = return_bytes(ini_get('post_max_size'));
 246     $size2 = return_bytes(ini_get('upload_max_filesize'));
 247     // Return the smaller of two:
 248     $maxsize = min($size1,$size2);
 249     // FIXME: Then convert back to readable notations ? (eg. 2M instead of 2000000)
 250     return $maxsize;
 251 }
 252
 253 // Tells if a string start with a substring or not.
 254 function startsWith($haystack,$needle,$case=true)
 255 {
 256     if($case){return (strcmp(substr($haystack, 0, strlen($needle)),$needle)===0);}
 257     return (strcasecmp(substr($haystack, 0, strlen($needle)),$needle)===0);
 258 }
 259
 260 // Tells if a string ends with a substring or not.
 261 function endsWith($haystack,$needle,$case=true)
 262 {
 263     if($case){return (strcmp(substr($haystack, strlen($haystack) - strlen($needle)),$needle)===0);}
 264     return (strcasecmp(substr($haystack, strlen($haystack) - strlen($needle)),$needle)===0);
 265 }
 266
 267 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 268     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 269     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 270 function linkdate2timestamp($linkdate)
 271 {
 272     $Y=$M=$D=$h=$m=$s=0;
 273     $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 274     return mktime($h,$m,$s,$M,$D,$Y);
 275 }
 276
 277 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 278     (used to build the pubDate attribute in RSS feed.)  */
 279 function linkdate2rfc822($linkdate)
 280 {
 281     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 282 }
 283
 284 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a localized date format.
 285     (used to display link date on screen)
 286     The date format is automatically chose according to locale/languages sniffed from browser headers (see autoLocale()). */
 287 function linkdate2locale($linkdate)
 288 {
 289     return utf8_encode(strftime('%c',linkdate2timestamp($linkdate))); // %c is for automatic date format according to locale.
 290     // Note that if you use a local which is not installed on your webserver,
 291     // the date will not be displayed in the chosen locale, but probably in US notation.
 292 }
 293
 294 // Parse HTTP response headers and return an associative array.
 295 function http_parse_headers( $headers )
 296 {
 297     $res=array();
 298     foreach($headers as $header)
 299     {
 300         $i = strpos($header,': ');
 301         if ($i)
 302         {
 303             $key=substr($header,0,$i);
 304             $value=substr($header,$i+2,strlen($header)-$i-2);
 305             $res[$key]=$value;
 306         }
 307     }
 308     return $res;
 309 }
 310
 311 /* GET an URL.
 312    Input: $url : url to get (http://...)
 313           $timeout : Network timeout (will wait this many seconds for an anwser before giving up).
 314    Output: An array.  [0] = HTTP status message (eg. "HTTP/1.1 200 OK") or error message
 315                       [1] = associative array containing HTTP response headers (eg. echo getHTTP($url)[1]['Content-Type'])
 316                       [2] = data
 317     Example: list($httpstatus,$headers,$data) = getHTTP('http://sebauvage.net/');
 318              if (strpos($httpstatus,'200 OK'))
 319                  echo 'Data type: '.htmlspecialchars($headers['Content-Type']);
 320              else
 321                  echo 'There was an error: '.htmlspecialchars($httpstatus)
 322 */
 323 function getHTTP($url,$timeout=30)
 324 {
 325     try
 326     {
 327         $options = array('http'=>array('method'=>'GET','timeout' => $timeout)); // Force network timeout
 328         $context = stream_context_create($options);
 329         $data=file_get_contents($url,false,$context,-1, 2000000); // We download at most 2 Mb from source.
 330         if (!$data) { $lasterror=error_get_last();  return array($lasterror['message'],array(),''); }
 331         $httpStatus=$http_response_header[0]; // eg. "HTTP/1.1 200 OK"
 332         $responseHeaders=http_parse_headers($http_response_header);
 333         return array($httpStatus,$responseHeaders,$data);
 334     }
 335     catch (Exception $e)  // getHTTP *can* fail silentely (we don't care if the title cannot be fetched)
 336     {
 337         return array($e->getMessage(),'','');
 338     }
 339 }
 340
 341 // Extract title from an HTML document.
 342 // (Returns an empty string if not found.)
 343 function html_extract_title($html)
 344 {
 345   return preg_match('!<title>(.*?)</title>!i', $html, $matches) ? $matches[1] : '';
 346 }
 347
 348 // ------------------------------------------------------------------------------------------
 349 // Token management for XSRF protection
 350 // Token should be used in any form which acts on data (create,update,delete,import...).
 351 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 352
 353 // Returns a token.
 354 function getToken()
 355 {
 356     $rnd = sha1(uniqid('',true).'_'.mt_rand());  // We generate a random string.
 357     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 358     return $rnd;
 359 }
 360
 361 // Tells if a token is ok. Using this function will destroy the token.
 362 // true=token is ok.
 363 function tokenOk($token)
 364 {
 365     if (isset($_SESSION['tokens'][$token]))
 366     {
 367         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 368         return true; // Token is ok.
 369     }
 370     return false; // Wrong token, or already used.
 371 }
 372
 373 // ------------------------------------------------------------------------------------------
 374 /* Data storage for links.
 375    This object behaves like an associative array.
 376    Example:
 377       $mylinks = new linkdb();
 378       echo $mylinks['20110826_161819']['title'];
 379       foreach($mylinks as $link)
 380          echo $link['title'].' at url '.$link['url'].' ; description:'.$link['description'];
 381
 382    We implement 3 interfaces:
 383      - ArrayAccess so that this object behaves like an associative array.
 384      - Iterator so that this object can be used in foreach() loops.
 385      - Countable interface so that we can do a count() on this object.
 386 */
 387 class linkdb implements Iterator, Countable, ArrayAccess
 388
 389 {
 390     private $links; // List of links (associative array. Key=linkdate (eg. "20110823_124546"), value= associative array (keys:title,description...)
 391     private $urls;  // List of all recorded URLs (key=url, value=linkdate) for fast reserve search (url-->linkdate)
 392     private $keys;  // List of linkdate keys (for the Iterator interface implementation)
 393     private $position; // Position in the $this->keys array. (for the Iterator interface implementation.)
 394     private $loggedin; // Is the used logged in ? (used to filter private links)
 395
 396     // Constructor:
 397     function __construct($isLoggedIn)
 398     // Input : $isLoggedIn : is the used logged in ?
 399     {
 400         $this->loggedin = $isLoggedIn;
 401         $this->checkdb(); // Make sure data file exists.
 402         $this->readdb();  // Then read it.
 403     }
 404
 405     // ---- Countable interface implementation
 406     public function count() { return count($this->links); }
 407
 408     // ---- ArrayAccess interface implementation
 409     public function offsetSet($offset, $value)
 410     {
 411         if (!$this->loggedin) die('You are not authorized to add a link.');
 412         if (empty($value['linkdate']) || empty($value['url'])) die('Internal Error: A link should always have a linkdate and url.');
 413         if (empty($offset)) die('You must specify a key.');
 414         $this->links[$offset] = $value;
 415         $this->urls[$value['url']]=$offset;
 416     }
 417     public function offsetExists($offset) { return array_key_exists($offset,$this->links); }
 418     public function offsetUnset($offset)
 419     {
 420         if (!$this->loggedin) die('You are not authorized to delete a link.');
 421         $url = $this->links[$offset]['url']; unset($this->urls[$url]);
 422         unset($this->links[$offset]);
 423     }
 424     public function offsetGet($offset) { return isset($this->links[$offset]) ? $this->links[$offset] : null; }
 425
 426     // ---- Iterator interface implementation
 427     function rewind() { $this->keys=array_keys($this->links); rsort($this->keys); $this->position=0; } // Start over for iteration, ordered by date (latest first).
 428     function key() { return $this->keys[$this->position]; } // current key
 429     function current() { return $this->links[$this->keys[$this->position]]; } // current value
 430     function next() { ++$this->position; } // go to next item
 431     function valid() { return isset($this->keys[$this->position]); }    // Check if current position is valid.
 432
 433     // ---- Misc methods
 434     private function checkdb() // Check if db directory and file exists.
 435     {
 436         if (!file_exists(DATASTORE)) // Create a dummy database for example.
 437         {
 438              $this->links = array();
 439              $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');
 440              $this->links[$link['linkdate']] = $link;
 441              $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');
 442              $this->links[$link['linkdate']] = $link;
 443              file_put_contents(DATASTORE, PHPPREFIX.base64_encode(gzdeflate(serialize($this->links))).PHPSUFFIX); // Write database to disk
 444         }
 445     }
 446
 447     // Read database from disk to memory
 448     private function readdb()
 449     {
 450         // Read data
 451         $this->links=(file_exists(DATASTORE) ? unserialize(gzinflate(base64_decode(substr(file_get_contents(DATASTORE),strlen(PHPPREFIX),-strlen(PHPSUFFIX))))) : array() );
 452
 453         // If user is not logged in, filter private links.
 454         if (!$this->loggedin)
 455         {
 456             $toremove=array();
 457             foreach($this->links as $link) { if ($link['private']!=0) $toremove[]=$link['linkdate']; }
 458             foreach($toremove as $linkdate) { unset($this->links[$linkdate]); }
 459         }
 460
 461         // Keep the list of the mapping URLs-->linkdate up-to-date.
 462         $this->urls=array();
 463         foreach($this->links as $link) { $this->urls[$link['url']]=$link['linkdate']; }
 464     }
 465
 466     // Save database from memory to disk.
 467     public function savedb()
 468     {
 469         if (!$this->loggedin) die('You are not authorized to change the database.');
 470         file_put_contents(DATASTORE, PHPPREFIX.base64_encode(gzdeflate(serialize($this->links))).PHPSUFFIX);
 471     }
 472
 473     // Returns the link for a given URL (if it exists). false it does not exist.
 474     public function getLinkFromUrl($url)
 475     {
 476         if (isset($this->urls[$url])) return $this->links[$this->urls[$url]];
 477         return false;
 478     }
 479
 480     // Case insentitive search among links (in url, title and description). Returns filtered list of links.
 481     // eg. print_r($mydb->filterTags('hollandais'));
 482     public function filterFulltext($searchterms)
 483     {
 484         // FIXME: explode(' ',$searchterms) and perform a AND search.
 485         // FIXME: accept double-quotes to search for a string "as is" ?
 486         $filtered=array();
 487         $s = strtolower($searchterms);
 488         foreach($this->links as $l)
 489         {
 490             $found=strpos(strtolower($l['title']),$s) || strpos(strtolower($l['description']),$s) || strpos(strtolower($l['url']),$s) || strpos(strtolower($l['tags']),$s);
 491             if ($found) $filtered[$l['linkdate']] = $l;
 492         }
 493         krsort($filtered);
 494         return $filtered;
 495     }
 496
 497     // Filter by tag.
 498     // You can specify one or more tags (tags can be separated by space or comma).
 499     // eg. print_r($mydb->filterTags('linux programming'));
 500     public function filterTags($tags)
 501     {
 502         $t = str_replace(',',' ',strtolower($tags));
 503         $searchtags=explode(' ',$t);
 504         $filtered=array();
 505         foreach($this->links as $l)
 506         {
 507             $linktags = explode(' ',strtolower($l['tags']));
 508             if (count(array_intersect($linktags,$searchtags)) == count($searchtags))
 509                 $filtered[$l['linkdate']] = $l;
 510         }
 511         krsort($filtered);
 512         return $filtered;
 513     }
 514
 515     // Returns the list of all tags
 516     // Output: associative array key=tags, value=0
 517     public function allTags()
 518     {
 519         $tags=array();
 520         foreach($this->links as $link)
 521             foreach(explode(' ',$link['tags']) as $tag)
 522                 if (!empty($tag)) $tags[$tag]=(empty($tags[$tag]) ? 1 : $tags[$tag]+1);
 523         arsort($tags); // Sort tags by usage (most used tag first)
 524         return $tags;
 525     }
 526
 527 }
 528
 529 // ------------------------------------------------------------------------------------------
 530 // Ouput the last 50 links in RSS 2.0 format.
 531 function showRSS()
 532 {
 533     global $LINKSDB;
 534
 535     // Optionnaly filter the results:
 536     $linksToDisplay=array();
 537     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 538     elseif (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags($_GET['searchtags']);
 539     else $linksToDisplay = $LINKSDB;
 540
 541     header('Content-Type: application/xhtml+xml; charset=utf-8');
 542     $pageaddr=htmlspecialchars(serverUrl().$_SERVER["SCRIPT_NAME"]);
 543     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 544     echo '<channel><title>Shared links on '.$pageaddr.'</title><link>'.$pageaddr.'</link>';
 545     echo '<description>Shared links</description><language></language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 546     $i=0;
 547     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 548     while ($i<50 && $i<count($keys))
 549     {
 550         $link = $linksToDisplay[$keys[$i]];
 551         $rfc822date = linkdate2rfc822($link['linkdate']);
 552         echo '<item><title>'.htmlspecialchars($link['title']).'</title><guid>'.htmlspecialchars($link['url']).'</guid><link>'.htmlspecialchars($link['url']).'</link><pubDate>'.htmlspecialchars($rfc822date).'</pubDate>';
 553         echo '<description><![CDATA['.htmlspecialchars($link['description']).']]></description></item>'."\n";
 554         $i++;
 555     }
 556     echo '</channel></rss>';
 557     exit;
 558 }
 559
 560 // ------------------------------------------------------------------------------------------
 561 // Render HTML page:
 562 function renderPage()
 563 {
 564     global $STARTTIME;
 565     global $LINKSDB;
 566
 567     // Well... rendering the page would be 100x better with the excellent Smarty, but I don't want to tie this minimalist project to 100+ files.
 568     // So I use a custom templating system.
 569
 570     // -------- Display login form.
 571     if (startswith($_SERVER["QUERY_STRING"],'do=login'))
 572     {
 573         if (OPEN_SHAARLI) { header('Location: ?'); exit; }  // No need to login for open Shaarli
 574         if (!ban_canLogin())
 575         {
 576             $loginform='<div id="headerform">You have been banned from login after too many failed attempts. Try later.</div>';
 577             $data = array('pageheader'=>$loginform,'body'=>'','onload'=>'');
 578             templatePage($data);
 579             exit;
 580         }
 581         $returnurl_html = (isset($_SERVER['HTTP_REFERER']) ? '<input type="hidden" name="returnurl" value="'.htmlspecialchars($_SERVER['HTTP_REFERER']).'">' : '');
 582         $loginform='<div id="headerform"><form method="post" name="loginform">Login: <input type="text" name="login">&nbsp;&nbsp;&nbsp;Password : <input type="password" name="password"> <input type="submit" value="Login" class="bigbutton"><input type="hidden" name="token" value="'.getToken().'">'.$returnurl_html.'</form></div>';
 583         $onload = 'onload="document.loginform.login.focus();"';
 584         $data = array('pageheader'=>$loginform,'body'=>'','onload'=>$onload);
 585         templatePage($data);
 586         exit;
 587     }
 588
 589     // -------- User wants to logout.
 590     if (startswith($_SERVER["QUERY_STRING"],'do=logout'))
 591     {
 592         invalidateCaches();
 593         logout();
 594         header('Location: ?');
 595         exit;
 596     }
 597
 598     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
 599     if (isset($_GET['addtag']))
 600     {
 601         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
 602         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
 603         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
 604         $params['searchtags'] = (empty($params['searchtags']) ?  trim($_GET['addtag']) : trim($params['searchtags'].' '.urlencode($_GET['addtag'])));
 605         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
 606         header('Location: ?'.http_build_query($params));
 607         exit;
 608     }
 609
 610     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
 611     if (isset($_GET['removetag']))
 612     {
 613         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
 614         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?'); exit; } // In case browser does not send HTTP_REFERER
 615         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
 616         if (isset($params['searchtags']))
 617         {
 618             $tags = explode(' ',$params['searchtags']);
 619             $tags=array_diff($tags, array($_GET['removetag'])); // Remove value from array $tags.
 620             if (count($tags)==0) unset($params['searchtags']); else $params['searchtags'] = implode(' ',$tags);
 621             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
 622         }
 623         header('Location: ?'.http_build_query($params));
 624         exit;
 625     }
 626
 627     // -------- User wants to change the number of links per page (linksperpage=...)
 628     if (isset($_GET['linksperpage']))
 629     {
 630         if (is_numeric($_GET['linksperpage'])) { $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage'])); }
 631         header('Location: '.(empty($_SERVER['HTTP_REFERER'])?'?':$_SERVER['HTTP_REFERER']));
 632         exit;
 633     }
 634
 635
 636     // -------- Handle other actions allowed for non-logged in users:
 637     if (!isLoggedIn())
 638     {
 639         // User tries to post new link but is not loggedin:
 640         // Show login screen, then redirect to ?post=...
 641         if (isset($_GET['post']))
 642         {
 643             header('Location: ?do=login&post='.urlencode($_GET['post']).(isset($_GET['source'])?'&source='.urlencode($_GET['source']):'')); // Redirect to login page, then back to post link.
 644             exit;
 645         }
 646
 647         // Show search form and display list of links.
 648         $searchform=<<<HTML
 649 <div id="headerform" style="width:100%; white-space:nowrap;";>
 650     <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>
 651     <form method="GET" name="tagfilter" style="display:inline;padding-left:24px;"><input type="text" name="searchtags" style="width:20%" value=""> <input type="submit" value="Filter by tag" class="bigbutton"></form>
 652 </div>
 653 HTML;
 654         $onload = 'document.searchform.searchterm.focus();';
 655         $data = array('pageheader'=>$searchform,'body'=>templateLinkList(),'onload'=>$onload);
 656         templatePage($data);
 657         exit; // Never remove this one !
 658     }
 659
 660     // -------- All other functions are reserved for the registered user:
 661
 662     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
 663     if (startswith($_SERVER["QUERY_STRING"],'do=tools'))
 664     {
 665         $pageabsaddr=serverUrl().$_SERVER["SCRIPT_NAME"]; // Why doesn't php have a built-in function for that ?
 666         // The javascript code for the bookmarklet:
 667         $toolbar= <<<HTML
 668 <div id="headerform"><br>
 669     <a href="?do=import"><b>Import</b></a> - Import Netscape html bookmarks (as exported from Firefox, Chrome, Opera, delicious...)<br><br>
 670     <a href="?do=export"><b>Export</b></a> - Export Netscape html bookmarks (which can be imported in Firefox, Chrome, Opera, delicious...)<br><br>
 671     <a class="smallbutton" style="color:black;" onclick="alert('Drag this link to your bookmarks toolbar, or right-click it and choose Bookmark This Link...');return false;" href="javascript:javascript:(function(){var%20url%20=%20location.href;var%20title%20=%20document.title%20||%20url;window.open('{$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>
 672 </div>
 673 HTML;
 674         $data = array('pageheader'=>$toolbar,'body'=>'','onload'=>'');
 675         templatePage($data);
 676         exit;
 677     }
 678
 679     // -------- User wants to add a link without using the bookmarklet: show form.
 680     if (startswith($_SERVER["QUERY_STRING"],'do=addlink'))
 681     {
 682         $onload = 'document.addform.post.focus();';
 683         $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>';
 684         $data = array('pageheader'=>$addform,'body'=>'','onload'=>$onload);
 685         templatePage($data);
 686         exit;
 687     }
 688
 689     // -------- User clicked the "Save" button when editing a link: Save link to database.
 690     if (isset($_POST['save_edit']))
 691     {
 692         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away !
 693         $linkdate=$_POST['lf_linkdate'];
 694         $link = array('title'=>trim($_POST['lf_title']),'url'=>trim($_POST['lf_url']),'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
 695                       'linkdate'=>$linkdate,'tags'=>trim($_POST['lf_tags']));
 696         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
 697         $LINKSDB[$linkdate] = $link;
 698         $LINKSDB->savedb(); // save to disk
 699         invalidateCaches();
 700
 701         // If we are called from the bookmarklet, we must close the popup:
 702         if (isset($_GET['source']) && $_GET['source']=='bookmarklet') { echo '<script language="JavaScript">self.close();</script>'; exit; }
 703         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
 704         header('Location: '.$returnurl); // After saving the link, redirect to the page the user was on.
 705         exit;
 706     }
 707
 708     // -------- User clicked the "Cancel" button when editing a link.
 709     if (isset($_POST['cancel_edit']))
 710     {
 711         // If we are called from the bookmarklet, we must close the popup;
 712         if (isset($_GET['source']) && $_GET['source']=='bookmarklet') { echo '<script language="JavaScript">self.close();</script>'; exit; }
 713         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
 714         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
 715         exit;
 716     }
 717
 718     // -------- User clicked the "Delete" button when editing a link : Delete link from database.
 719     if (isset($_POST['delete_link']))
 720     {
 721         if (!tokenOk($_POST['token'])) die('Wrong token.');
 722         // We do not need to ask for confirmation:
 723         // - confirmation is handled by javascript
 724         // - we are protected from XSRF by the token.
 725         $linkdate=$_POST['lf_linkdate'];
 726         unset($LINKSDB[$linkdate]);
 727         $LINKSDB->savedb(); // save to disk
 728         invalidateCaches();
 729         // If we are called from the bookmarklet, we must close the popup:
 730         if (isset($_GET['source']) && $_GET['source']=='bookmarklet') { echo '<script language="JavaScript">self.close();</script>'; exit; }
 731         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
 732         header('Location: '.$returnurl); // After deleting the link, redirect to the page the user was on.
 733         exit;
 734     }
 735
 736     // -------- User clicked the "EDIT" button on a link: Display link edit form.
 737     if (isset($_GET['edit_link']))
 738     {
 739         $link = $LINKSDB[$_GET['edit_link']];  // Read database
 740         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
 741         list($editform,$onload)=templateEditForm($link);
 742         $data = array('pageheader'=>$editform,'body'=>'','onload'=>$onload);
 743         templatePage($data);
 744         exit;
 745     }
 746
 747     // -------- User want to post a new link: Display link edit form.
 748     if (isset($_GET['post']))
 749     {
 750         $url=$_GET['post'];
 751
 752         // We remove the annoying parameters added by FeedBurner and GoogleFeedProxy (?utm_source=...)
 753         $i=strpos($url,'&utm_source='); if ($i) $url=substr($url,0,$i);
 754         $i=strpos($url,'?utm_source='); if ($i) $url=substr($url,0,$i);
 755
 756         $link_is_new = false;
 757         $link = $LINKSDB->getLinkFromUrl($url); // Check if URL is not already in database (in this case, we will edit the existing link)
 758         if (!$link)
 759         {
 760             $link_is_new = true;  // This is a new link
 761             $linkdate = strval(date('Ymd_His'));
 762             $title = (empty($_GET['title']) ? '' : $_GET['title'] ); // Get title if it was provided in URL (by the bookmarklet).
 763             $description=''; $tags=''; $private=0;
 764             if (parse_url($url,PHP_URL_SCHEME)=='') $url = 'http://'.$url;
 765             // 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.)
 766             if (empty($title) && parse_url($url,PHP_URL_SCHEME)=='http')
 767             {
 768                 list($status,$headers,$data) = getHTTP($url,4); // Short timeout to keep the application responsive.
 769                 // FIXME: Decode charset according to specified in either 1) HTTP response headers or 2) <head> in html
 770                 if (strpos($status,'200 OK')) $title=html_entity_decode(html_extract_title($data),ENT_QUOTES,'UTF-8');
 771             }
 772             $link = array('linkdate'=>$linkdate,'title'=>$title,'url'=>$url,'description'=>$description,'tags'=>$tags,'private'=>0);
 773         }
 774         list($editform,$onload)=templateEditForm($link,$link_is_new);
 775         $data = array('pageheader'=>$editform,'body'=>'','onload'=>$onload);
 776         templatePage($data);
 777         exit;
 778     }
 779
 780     // -------- Export as Netscape Bookmarks HTML file.
 781     if (startswith($_SERVER["QUERY_STRING"],'do=export'))
 782     {
 783         if (empty($_GET['what']))
 784         {
 785             $toolbar= <<<HTML
 786 <div id="headerform"><br>
 787     <a href="?do=export&what=all"><b>Export all</b></a> - Export all links<br><br>
 788     <a href="?do=export&what=public"><b>Export public</b></a> - Export public links only<br><br>
 789     <a href="?do=export&what=private"><b>Export private</b></a> - Export private links only<br><br>
 790 </div>
 791 HTML;
 792             $data = array('pageheader'=>$toolbar,'body'=>'','onload'=>'');
 793             templatePage($data);
 794             exit;
 795         }
 796         $exportWhat=$_GET['what'];
 797         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export ???');
 798
 799         header('Content-Type: text/html; charset=utf-8');
 800         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
 801         echo <<<HTML
 802 <!DOCTYPE NETSCAPE-Bookmark-file-1>
 803 <!-- This is an automatically generated file.
 804      It will be read and overwritten.
 805      DO NOT EDIT! -->
 806 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
 807 <TITLE>Bookmarks</TITLE>
 808 <H1>Bookmarks</H1>
 809 HTML;
 810         foreach($LINKSDB as $link)
 811         {
 812             if ($exportWhat=='all' ||
 813                ($exportWhat=='private' && $link['private']!=0) ||
 814                ($exportWhat=='public' && $link['private']==0))
 815             {
 816                 echo '<DT><A HREF="'.htmlspecialchars($link['url']).'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
 817                 if ($link['tags']!='') echo ' TAGS="'.htmlspecialchars(str_replace(' ',',',$link['tags'])).'"';
 818                 echo '>'.htmlspecialchars($link['title'])."</A>\n";
 819                 if ($link['description']!='') echo '<DD>'.htmlspecialchars($link['description'])."\n";
 820             }
 821         }
 822         echo '<!-- Shaarli '.$exportWhat.' bookmarks export on '.date('Y/m/d H:i:s')."-->\n";
 823         exit;
 824     }
 825
 826     // -------- User is uploading a file for import
 827     if (startswith($_SERVER["QUERY_STRING"],'do=upload'))
 828     {
 829         // If file is too big, some form field may be missing.
 830         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
 831         {
 832             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
 833             echo '<script language="JavaScript">alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.htmlspecialchars($returnurl).'\';</script>';
 834             exit;
 835         }
 836         if (!tokenOk($_POST['token'])) die('Wrong token.');
 837         importFile();
 838         exit;
 839     }
 840
 841     // -------- Show upload/import dialog:
 842     if (startswith($_SERVER["QUERY_STRING"],'do=import'))
 843     {
 844         $token = getToken();
 845         $maxfilesize=getMaxFileSize();
 846         $onload = 'onload="document.uploadform.filetoupload.focus();"';
 847         $uploadform=<<<HTML
 848 <div id="headerform">
 849 Import Netscape html bookmarks (as exported from Firefox/Chrome/Opera/delicious/diigo...) (Max: {$maxfilesize} bytes).
 850 <form method="POST" action="?do=upload" enctype="multipart/form-data" name="uploadform">
 851     <input type="hidden" name="token" value="{$token}">
 852     <input type="file" name="filetoupload" size="80">
 853     <input type="hidden" name="MAX_FILE_SIZE" value="{$maxfilesize}">
 854     <input type="submit" name="import_file" value="Import" class="bigbutton"><br>
 855     <input type="checkbox" name="private">&nbsp;Import all links as private
 856 </form>
 857 </div>
 858 HTML;
 859         $data = array('pageheader'=>$uploadform,'body'=>'','onload'=>$onload  );
 860         templatePage($data);
 861         exit;
 862     }
 863
 864     // -------- Otherwise, simply display search form and links:
 865     $searchform=<<<HTML
 866 <div id="headerform" style="width:100%; white-space:nowrap;";>
 867     <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>
 868     <form method="GET" name="tagfilter" style="display:inline;padding-left:24px;"><input type="text" name="searchtags" style="width:20%" value=""> <input type="submit" value="Filter by tag" class="bigbutton"></form>
 869 </div>
 870 HTML;
 871     $onload = 'document.searchform.searchterm.focus();';
 872     $data = array('pageheader'=>$searchform,'body'=>templateLinkList(),'onload'=>$onload);
 873     templatePage($data);
 874     exit;
 875 }
 876
 877 // -----------------------------------------------------------------------------------------------
 878 // Process the import file form.
 879 function importFile()
 880 {
 881     global $LINKSDB;
 882     $filename=$_FILES['filetoupload']['name'];
 883     $filesize=$_FILES['filetoupload']['size'];
 884     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
 885     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private ?
 886
 887     // Sniff file type:
 888     $type='unknown';
 889     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
 890
 891     // Then import the bookmarks.
 892     if ($type=='netscape')
 893     {
 894         // This is a standard Netscape-style bookmark file.
 895         // This format is supported by all browsers (except IE, of course), also delicious, diigo and others.
 896         // I didn't want to use DOM... anyway, this is FAST (less than 1 second to import 7200 links (2.1 Mb html file)).
 897         $before=count($LINKSDB);
 898         foreach(explode('<DT>',$data) as $html) // explode is very fast
 899         {
 900             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
 901             $d = explode('<DD>',$html);
 902             if (startswith($d[0],'<A '))
 903             {
 904                 $link['description'] = (isset($d[1]) ? trim($d[1]) : '');  // Get description (optional)
 905                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
 906                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
 907                 foreach($matches as $m)
 908                 {
 909                     $attr=$m[1]; $value=$m[2];
 910                     if ($attr=='HREF') $link['url']=$value;
 911                     elseif ($attr=='ADD_DATE') $link['linkdate']=date('Ymd_His',intval($value));
 912                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
 913                     elseif ($attr=='TAGS') $link['tags']=str_replace(',',' ',$value);
 914                 }
 915                 if ($link['linkdate']!='' && $link['url']!='' && empty($LINKSDB[$link['linkdate']]))
 916                 {
 917                     if ($private==1) $link['private']=1;
 918                     $LINKSDB[$link['linkdate']] = $link;
 919                 }
 920             }
 921         }
 922         $import_count = count($LINKSDB)-$before;
 923         $LINKSDB->savedb();
 924         invalidateCaches();
 925         echo '<script language="JavaScript">alert("File '.$filename.' ('.$filesize.' bytes) was successfully imported: '.$import_count.' new links.");document.location=\'?\';</script>';
 926     }
 927     else
 928     {
 929         echo '<script language="JavaScript">alert("File '.$filename.' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
 930     }
 931 }
 932
 933 // -----------------------------------------------------------------------------------------------
 934 /* Template for the edit link form
 935     Input: $link : link to edit (assocative array item as returned by the LINKDB class)
 936 Output: An array : (string) : The html code of the edit link form.
 937                    (string) : The proper onload to use in body.
 938     Example: list($html,$onload)=templateEditForm($mylinkdb['20110805_124532']);
 939              echo $html;
 940 */
 941 function templateEditForm($link,$link_is_new=false)
 942 {
 943     $url=htmlspecialchars($link['url']);
 944     $title=htmlspecialchars($link['title']);
 945     $tags=htmlspecialchars($link['tags']);
 946     $description=htmlspecialchars($link['description']);
 947     $private = ($link['private']==0 ? '' : 'checked="yes"');
 948
 949     // Automatically focus on empty fields:
 950     $onload='onload="document.linkform.lf_tags.focus();"';
 951     if ($description=='') $onload='onload="document.linkform.lf_description.focus();"';
 952     if ($title=='') $onload='onload="document.linkform.lf_title.focus();"';
 953
 954     // Do not show "Delete" button if this is a new link.
 955     $delete_button = '<input type="submit" value="Delete" name="delete_link" class="bigbutton" style="margin-left:180px;" onClick="return confirmDeleteLink();">';
 956     if ($link_is_new) $delete_button='';
 957
 958     $token=getToken(); // XSRF protection.
 959     $returnurl_html = (isset($_SERVER['HTTP_REFERER']) ? '<input type="hidden" name="returnurl" value="'.htmlspecialchars($_SERVER['HTTP_REFERER']).'">' : '');
 960     $editlinkform=<<<HTML
 961 <div id="editlinkform">
 962     <form method="post" name="linkform">
 963         <input type="hidden" name="lf_linkdate" value="{$link['linkdate']}">
 964         <i>URL</i><br><input type="text" name="lf_url" value="{$url}" style="width:100%"><br>
 965         <i>Title</i><br><input type="text" name="lf_title" value="{$title}" style="width:100%"><br>
 966         <i>Description</i><br><textarea name="lf_description" rows="4" cols="25" style="width:100%">{$description}</textarea><br>
 967         <i>Tags</i><br><input type="text" id="lf_tags" name="lf_tags" value="{$tags}" style="width:100%"><br>
 968         <input type="checkbox" {$private} style="margin:7 0 10 0;" name="lf_private">&nbsp;<i>Private</i><br>
 969         <input type="submit" value="Save" name="save_edit" class="bigbutton" style="margin-left:40px;">
 970         <input type="submit" value="Cancel" name="cancel_edit" class="bigbutton" style="margin-left:40px;">
 971         {$delete_button}
 972         <input type="hidden" name="token" value="{$token}">
 973         {$returnurl_html}
 974     </form>
 975 </div>
 976 HTML;
 977     return array($editlinkform,$onload);
 978 }
 979
 980
 981 // -----------------------------------------------------------------------------------------------
 982 // Template for the list of links.
 983 // Returns html code to show the list of link according to parameters passed in URL (search terms, page...)
 984 function templateLinkList()
 985 {
 986     global $LINKSDB;
 987
 988     // Search according to entered search terms:
 989     $linksToDisplay=array();
 990     $searched='';
 991     if (!empty($_GET['searchterm'])) // Fulltext search
 992     {
 993         $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 994         $searched='&nbsp;<b>'.count($linksToDisplay).' results for <i>'.htmlspecialchars($_GET['searchterm']).'</i></b>:';
 995     }
 996     elseif (!empty($_GET['searchtags'])) // Search by tag
 997     {
 998         $linksToDisplay = $LINKSDB->filterTags($_GET['searchtags']);
 999         $tagshtml=''; foreach(explode(' ',$_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> ';
1000         $searched='&nbsp;<b>'.count($linksToDisplay).' results for tags '.$tagshtml.':</b>';
1001     }
1002     else
1003         $linksToDisplay = $LINKSDB;  // otherwise, display without filtering.
1004
1005     $linklist='';
1006     $actions='';
1007
1008     // Handle paging.
1009     /* Can someone explain to me why you get the following error when using array_keys() on an object which implements the interface ArrayAccess ???
1010        "Warning: array_keys() expects parameter 1 to be array, object given in ... "
1011        If my class implements ArrayAccess, why won't array_keys() accept it ?  ( $keys=array_keys($linksToDisplay); )
1012     */
1013     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; } // Stupid and ugly. Thanks php.
1014     $pagecount = ceil(count($keys)/$_SESSION['LINKS_PER_PAGE']);
1015     $pagecount = ($pagecount==0 ? 1 : $pagecount);
1016     $page=( empty($_GET['page']) ? 1 : intval($_GET['page']));
1017     $page = ( $page<1 ? 1 : $page );
1018     $page = ( $page>$pagecount ? $pagecount : $page );
1019     $i = ($page-1)*$_SESSION['LINKS_PER_PAGE']; // Start index.
1020     $end = $i+$_SESSION['LINKS_PER_PAGE'];
1021     while ($i<$end && $i<count($keys))
1022     {
1023         $link = $linksToDisplay[$keys[$i]];
1024         $description=$link['description'];
1025         $title=$link['title'];
1026         $classprivate = ($link['private']==0 ? '' : 'class="private"');
1027         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>';
1028         $tags='';
1029         if ($link['tags']!='') foreach(explode(' ',$link['tags']) as $tag) { $tags.='<span class="linktag" title="Add tag"><a href="?addtag='.htmlspecialchars($tag).'">'.htmlspecialchars($tag).'</a></span> '; }
1030         $linklist.='<li '.$classprivate.'><span class="linktitle"><a href="'.htmlspecialchars($link['url']).'">'.htmlspecialchars($title).'</a></span>'.$actions.'<br>';
1031         if ($description!='') $linklist.='<div class="linkdescription">'.nl2br(htmlspecialchars($description)).'</div><br>';
1032         $linklist.='<span class="linkdate">'.htmlspecialchars(linkdate2locale($link['linkdate'])).' - </span><span class="linkurl">'.htmlspecialchars($link['url']).'</span><br>'.$tags."</li>\n";
1033         $i++;
1034     }
1035
1036     // Show paging.
1037     $searchterm= ( empty($_GET['searchterm']) ? '' : '&searchterm='.$_GET['searchterm'] );
1038     $searchtags= ( empty($_GET['searchtags']) ? '' : '&searchtags='.$_GET['searchtags'] );
1039     $paging='';
1040     if ($i!=count($keys)) $paging.='<a href="?page='.($page+1).$searchterm.$searchtags.'">&#x25C4;Older</a>';
1041     $paging.= '<span style="color:#fff; padding:0 20 0 20;">page '.$page.' / '.$pagecount.'</span>';
1042     if ($page>1) $paging.='<a href="?page='.($page-1).$searchterm.$searchtags.'">Newer&#x25BA;</a>';
1043     $linksperpage = <<<HTML
1044 <div style="float:right; padding-right:5px;">
1045 Links per page: <a href="?linksperpage=20">20</a> <a href="?linksperpage=50">50</a> <a href="?linksperpage=100">100</a>
1046  <form method="GET" style="display:inline;"><input type="text" name="linksperpage" size="2" style="height:15px;"></form></div>
1047 HTML;
1048     $paging = '<div class="paging">'.$linksperpage.$paging.'</div>';
1049     $linklist='<div id="linklist">'.$paging.$searched.'<ul>'.$linklist.'</ul>'.$paging.'</div>';
1050     return $linklist;
1051 }
1052
1053 // -----------------------------------------------------------------------------------------------
1054 // Template for the whole page.
1055 /* Input: $data (associative array).
1056                 Keys: 'body' : body of HTML document
1057                       'pageheader' : html code to show in page header (top of page)
1058                       'onload' : optional onload javascript for the <body>
1059 */
1060 function templatePage($data)
1061 {
1062     global $STARTTIME;
1063     global $LINKSDB;
1064     $shaarli_version = shaarli_version;
1065     $linkcount = count($LINKSDB);
1066     $open='';
1067     if (OPEN_SHAARLI)
1068     {
1069         $menu=' <a href="?do=tools">Tools</a> &nbsp;<a href="?do=addlink"><b>Add link</b></a>';
1070         $open='Open ';
1071     }
1072     else
1073         $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>');
1074     foreach(array('pageheader','body','onload') as $k) // make sure all required fields exist (put an empty string if not).
1075     {
1076         if (!array_key_exists($k,$data)) $data[$k]='';
1077     }
1078     $jsincludes=''; $jsincludes_bottom = '';
1079     if (OPEN_SHAARLI || isLoggedIn())
1080     {
1081         $jsincludes='<script language="JavaScript" src="jquery.min.js"></script><script language="JavaScript" src="jquery-ui.custom.min.js"></script>';
1082         $source = serverUrl().$_SERVER['SCRIPT_NAME'].'?ws=tags';
1083         $jsincludes_bottom = <<<JS
1084 <script language="JavaScript">
1085 $(document).ready(function()
1086 {
1087     $('#lf_tags').autocomplete({source:'{$source}',minLength:0});
1088 });
1089 </script>
1090 JS;
1091     }
1092     $feedurl=htmlspecialchars(serverUrl().$_SERVER['SCRIPT_NAME'].'?do=rss');
1093     echo <<<HTML
1094 <html>
1095 <head>
1096 <title>{$open}Shaarli - Let's shaare your links...</title>
1097 <link rel="alternate" type="application/rss+xml" href="{$feedurl}">
1098 {$jsincludes}
1099 <style type="text/css">
1100 <!--
1101 /* CSS Reset from Yahoo to cope with browsers CSS inconsistencies. */
1102 /*
1103 Copyright (c) 2010, Yahoo! Inc. All rights reserved. Code licensed under the BSD License: http://developer.yahoo.com/yui/license.html
1104 version: 2.8.2r1
1105 */
1106 html{color:#000;background:#FFF;}body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,code,form,fieldset,legend,input,button,textarea,p,blockquote,th,td{margin:0;padding:0;}table{border-collapse:collapse;border-spacing:0;}fieldset,img{border:0;}address,caption,cite,code,dfn,em,strong,th,var,optgroup{font-style:inherit;font-weight:inherit;}del,ins{text-decoration:none;}li{list-style:none;}caption,th{text-align:left;}h1,h2,h3,h4,h5,h6{font-size:100%;font-weight:normal;}q:before,q:after{content:'';}abbr,acronym{border:0;font-variant:normal;}sup{vertical-align:baseline;}sub{vertical-align:baseline;}legend{color:#000;}input,button,textarea,select,optgroup,option{font-family:inherit;font-size:inherit;font-style:inherit;font-weight:inherit;}input,button,textarea,select{*font-size:100%;}
1107
1108 body { font-family: "Trebuchet MS",Verdana,Arial,Helvetica,sans-serif; font-size:10pt; background-color: #ffffff; }
1109 input { border: 1px solid #aaa; background-color:#F0F0FF; padding: 2 5 2 5; -moz-box-shadow: inset 2px 2px 3px #aaaaaa; -webkit-box-shadow: inset 2px 2px 3px #aaaaaa; box-shadow: inset 2px 2px 3px #aaaaaa; }
1110 textarea { border: 1px solid #aaa; background-color:#F0F0FF; padding: 2 5 2 5; -moz-box-shadow: inset 2px 2px 3px #B2B2C4; -webkit-box-shadow: inset 2px 2px 3px #B2B2C4; box-shadow: inset 2px 2px 3px #B2B2C4; }
1111 /* I don't give a shit about IE. He can't understand selectors such as input[type='submit']. */
1112
1113 .bigbutton {border-style:outset;border-width:2px;padding:3px 6px;background-color:rgb(212,212,212);font-family:Tahoma,Verdana,Arial,Helvetica,sans-serif;font-size:8pt;-moz-border-radius:0.5em;border-radius:0.5em;}
1114 .smallbutton {border-style:outset;border-width:2px;padding:0px 4px;background-color:rgb(212,212,212);font-family:Tahoma,Verdana,Arial,Helvetica,sans-serif;font-size:8pt;-moz-border-radius:0.5em;border-radius:0.5em;}
1115 #pageheader
1116 {
1117 color:#eee;
1118 border-bottom: 1px solid #aaa;
1119 background-color: #6A6A6A;
1120 background-image: -webkit-gradient(linear, left top, left bottom, from(#6A6A6A), to(#303030)); /* Saf4+, Chrome */
1121 background-image: -webkit-linear-gradient(top, #6A6A6A, #303030); /* Chrome 10+, Saf5.1+ */
1122 background-image:    -moz-linear-gradient(top, #6A6A6A, #303030); /* FF3.6 */
1123 background-image:     -ms-linear-gradient(top, #6A6A6A, #303030); /* IE10 */
1124 background-image:      -o-linear-gradient(top, #6A6A6A, #303030); /* Opera 11.10+ */
1125 background-image:         linear-gradient(top, #6A6A6A, #303030);
1126 filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#6A6A6A', EndColorStr='#303030'); /* IE6-IE9 */
1127 padding-bottom: 5px;
1128 }
1129 #pageheader a:link { color:#bbb; text-decoration:none;}
1130 #pageheader a:visited { color:#bbb; text-decoration:none;}
1131 #pageheader a:hover { color:#FFFFC9; text-decoration:none;}
1132 #pageheader a:active { color:#bbb; text-decoration:none;}
1133 .paging { background-color:#777; color:#ccc; text-align:center; padding:0 0 3 0;}
1134 .paging a:link { color:#ccc; text-decoration:none;}
1135 .paging a:visited { color:#ccc;  }
1136 .paging a:hover {  color:#FFFFC9;  }
1137 .paging a:active { color:#fff;  }
1138 #headerform { padding:5 5 5 15;  }
1139 #editlinkform {  padding:5 5 5 15px; width:80%; }
1140 #linklist li { padding:4 10 8 20; border-bottom: 1px solid #bbb;}
1141 #linklist li.private { background-color: #ccc; border-left:8px solid #888; }
1142 .linktitle { font-size:14pt; font-weight:bold; }
1143 .linktitle a { text-decoration: none; color:#0000EE; }
1144 .linktitle a:hover { text-decoration: underline; }
1145 .linktitle a:visited { color:#0000BB; }
1146 .linkdate { font-size:8pt; color:#888; }
1147 .linkurl { font-size:8pt; color:#4BAA74; }
1148 .linkdescription { color:#000; margin-top:0px; margin-bottom:0px; font-weight:normal; }
1149 .linktag { font-size:9pt; color:#777; background-color:#ddd; padding:0 6 0 6; -moz-box-shadow: inset 2px 2px 3px #ffffff; -webkit-box-shadow: inset 2px 2px 3px #ffffff; box-shadow: inset 2px 2px 3px ffffff;
1150 border-bottom:1px solid #aaa; border-right:1px solid #aaa;  }
1151 .linktag a { color:#777; text-decoration:none;  }
1152 .buttoneditform { display:inline; }
1153 #footer { font-size:8pt; text-align:center; border-top:1px solid #ddd; color: #888; }
1154
1155 /* Minimal customisation for jQuery widgets */
1156 .ui-autocomplete { background-color:#fff; padding-left:5px;}
1157 .ui-state-hover { background-color: #604dff; color:#fff; }
1158
1159 -->
1160 </style>
1161 </head>
1162 <body {$data['onload']}>
1163 <div id="pageheader"><div style="float:right; font-style:italic; color:#bbb; text-align:right; padding:0 5 0 0;">Shaare your links...<br>{$linkcount} links</div>
1164     <b><i>{$open}Shaarli {$shaarli_version}</i></b> - <a href="?">Home</a>&nbsp;{$menu}&nbsp;<a href="{$feedurl}" style="padding-left:30px;">RSS Feed</a>
1165 {$data['pageheader']}
1166 </div>
1167 {$data['body']}
1168
1169 HTML;
1170     $exectime = round(microtime(true)-$STARTTIME,4);
1171     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>';
1172     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>';
1173     echo $jsincludes_bottom.'</body></html>';
1174 }
1175
1176 // -----------------------------------------------------------------------------------------------
1177 // Installation
1178 // This function should NEVER be called if the file data/config.php exists.
1179 function install()
1180 {
1181     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
1182     {
1183         $tz=(empty($_POST['settimezone']) ? 'UTC':$_POST['settimezone']);
1184         // Everything is ok, let's create config file.
1185         $salt=sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1186         $hash = sha1($_POST['setpassword'].$_POST['setlogin'].$salt);
1187         $config='<?php $GLOBALS[\'login\']='.var_export($_POST['setlogin'],true).'; $GLOBALS[\'hash\']='.var_export($hash,true).'; $GLOBALS[\'salt\']='.var_export($salt,true).'; date_default_timezone_set('.var_export($tz,true).'); ?>';
1188         if (!file_put_contents(CONFIG_FILE,$config) || strcmp(file_get_contents(CONFIG_FILE),$config)!=0)
1189         {
1190             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>';
1191             exit;
1192         }
1193         echo '<script language="JavaScript">alert("Shaarli is now configured. Please enter your login/password and start shaaring your links !");document.location=\'?do=login\';</script>';
1194         exit;
1195    }
1196     // Display config form:
1197     $timezoneselect='';
1198     if (function_exists('timezone_identifiers_list')) // because of old php version (5.1) which can be found on free.fr
1199     {
1200         $timezones='';
1201         foreach(timezone_identifiers_list() as $tz) $timezones.='<option value="'.htmlspecialchars($tz).'">'.htmlspecialchars($tz)."</option>\n";
1202         $timezoneselect='Timezone: <select name="settimezone"><option value="" selected>(please select:)</option>'.$timezones.'</select><br><br>';
1203     }
1204     echo <<<HTML
1205 <html><title>Shaarli - Configuration</title><style type="text/css">
1206 body { font-family: "Trebuchet MS",Verdana,Arial,Helvetica,sans-serif; font-size:10pt; background-color: #ffffff; }
1207 input { border: 1px solid #aaa; background-color:#F0F0FF; padding: 2 5 2 5; -moz-box-shadow: inset 2px 2px 3px #aaaaaa; -webkit-box-shadow: inset 2px 2px 3px #aaaaaa; box-shadow: inset 2px 2px 3px #aaaaaa; }
1208 .bigbutton {border-style:outset;border-width:2px;padding:3px 6px;background-color:rgb(212,212,212);font-family:Tahoma,Verdana,Arial,Helvetica,sans-serif;font-size:8pt;-moz-border-radius:0.5em;border-radius:0.5em;}
1209 </style></head><body onload="document.configform.setlogin.focus();"><h1>Shaarli - Shaare your links...</h1>It looks like it's the first time you run Shaarli. Please chose a login/password and a timezone:<br>
1210 <form method="POST" action="" name="configform" style="border:1px solid black; padding:10 10 10 10;">
1211 Login: <input type="text" name="setlogin"><br><br>Password: <input type="password" name="setpassword"><br><br>
1212 {$timezoneselect}
1213 <input type="submit" name="Save" value="Save config" class="bigbutton"></form></body></html>
1214 HTML;
1215     exit;
1216 }
1217
1218 // Webservices (for use with jQuery/jQueryUI)
1219 // eg.  index.php?ws=tags&term=minecr
1220 function processWS()
1221 {
1222     if (empty($_GET['ws']) || empty($_GET['term'])) return;
1223     $term = $_GET['term'];
1224     global $LINKSDB;
1225     header('Content-Type: application/json; charset=utf-8');
1226
1227     // Search in tags
1228     if ($_GET['ws']=='tags')
1229     {
1230         $tags=explode(' ',$term); $last = array_pop($tags); // Get the last term ("a b c d" ==> "a b c", "d")
1231         $addtags=''; if ($tags) $addtags=implode(' ',$tags).' '; // We will pre-pend previous tags
1232         $suggested=array();
1233         /* To speed up things, we store list of tags in session */
1234         if (empty($_SESSION['tags'])) $_SESSION['tags'] = $LINKSDB->allTags();
1235         foreach($_SESSION['tags'] as $key=>$value)
1236         {
1237             if (startsWith($key,$last,$case=false)) $suggested[$addtags.$key.' ']=0;
1238         }
1239         echo json_encode(array_keys($suggested));
1240         exit;
1241     }
1242 }
1243
1244 // Invalidate caches when the database is changed or the user logs out.
1245 // (eg. tags cache).
1246 function invalidateCaches()
1247 {
1248     unset($_SESSION['tags']);
1249 }
1250
1251 $LINKSDB=new linkdb(isLoggedIn() || OPEN_SHAARLI);  // Read links from database (and filter private links if used it not logged in).
1252 if (startswith($_SERVER["QUERY_STRING"],'ws=')) { processWS(); exit; } // Webservices (for jQuery/jQueryUI)
1253 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=LINKS_PER_PAGE;
1254 if (startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
1255 renderPage();
1256 ?>