index.php

   1 <?php
   2 /**
   3  * Shaarli v0.6.0 - Shaare your links...
   4  *
   5  * The personal, minimalist, super-fast, no-database Delicious clone.
   6  *
   7  * Friendly fork by the Shaarli community:
   8  *  - https://github.com/shaarli/Shaarli
   9  *
  10  * Original project by sebsauvage.net:
  11  *  - http://sebsauvage.net/wiki/doku.php?id=php:shaarli
  12  *  - https://github.com/sebsauvage/Shaarli
  13  *
  14  * Licence: http://www.opensource.org/licenses/zlib-license.php
  15  *
  16  * Requires: PHP 5.3.x
  17  */
  18
  19 // Set 'UTC' as the default timezone if it is not defined in php.ini
  20 // See http://php.net/manual/en/datetime.configuration.php#ini.date.timezone
  21 if (date_default_timezone_get() == '') {
  22     date_default_timezone_set('UTC');
  23 }
  24
  25 /* -----------------------------------------------------------------------------
  26  * Hardcoded parameters
  27  * You should not touch any code below (or at your own risks!)
  28  * (These parameters can be overwritten by editing the file /data/config.php)
  29  * -----------------------------------------------------------------------------
  30  */
  31
  32 /*
  33  * Shaarli directories & configuration files
  34  */
  35 // Data subdirectory
  36 $GLOBALS['config']['DATADIR'] = 'data';
  37
  38 // Main configuration file
  39 $GLOBALS['config']['CONFIG_FILE'] = $GLOBALS['config']['DATADIR'].'/config.php';
  40
  41 // Link datastore
  42 $GLOBALS['config']['DATASTORE'] = $GLOBALS['config']['DATADIR'].'/datastore.php';
  43
  44 // Banned IPs
  45 $GLOBALS['config']['IPBANS_FILENAME'] = $GLOBALS['config']['DATADIR'].'/ipbans.php';
  46
  47 // For updates check of Shaarli
  48 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt';
  49
  50 // RainTPL cache directory (keep the trailing slash!)
  51 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp/';
  52 // Raintpl template directory (keep the trailing slash!)
  53 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/';
  54
  55 // Thuumbnail cache directory
  56 $GLOBALS['config']['CACHEDIR'] = 'cache';
  57
  58 // Atom & RSS feed cache directory
  59 $GLOBALS['config']['PAGECACHE'] = 'pagecache';
  60
  61
  62 /*
  63  * Global configuration
  64  */
  65 // Ban IP after this many failures
  66 $GLOBALS['config']['BAN_AFTER'] = 4;
  67 // Ban duration for IP address after login failures (in seconds)
  68 $GLOBALS['config']['BAN_DURATION'] = 1800;
  69
  70 // Feed options
  71 // Enable RSS permalinks by default.
  72 // This corresponds to the default behavior of shaarli before this was added as an option.
  73 $GLOBALS['config']['ENABLE_RSS_PERMALINKS'] = true;
  74 // If true, an extra "ATOM feed" button will be displayed in the toolbar
  75 $GLOBALS['config']['SHOW_ATOM'] = false;
  76
  77 // Link display options
  78 $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = false;
  79 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false;
  80 $GLOBALS['config']['LINKS_PER_PAGE'] = 20;
  81
  82 // Open Shaarli (true): anyone can add/edit/delete links without having to login
  83 $GLOBALS['config']['OPEN_SHAARLI'] = false;
  84
  85 // Thumbnails
  86 // Display thumbnails in links
  87 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true;
  88 // Store thumbnails in a local cache
  89 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true;
  90
  91 // Update check frequency for Shaarli. 86400 seconds=24 hours
  92 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400 ;
  93
  94
  95 /*
  96  * Plugin configuration
  97  *
  98  * Warning: order matters!
  99  *
 100  * These settings may be be overriden in:
 101  *  - data/config.php
 102  *  - each plugin's configuration file
 103  */
 104 //$GLOBALS['config']['ENABLED_PLUGINS'] = array(
 105 //    'qrcode', 'archiveorg', 'readityourself', 'demo_plugin', 'playvideos',
 106 //    'wallabag', 'markdown', 'addlink_toolbar',
 107 //);
 108 $GLOBALS['config']['ENABLED_PLUGINS'] = array('qrcode');
 109
 110 //$GLOBALS['plugins']['WALLABAG_URL'] = 'https://demo.wallabag.org/';
 111
 112 // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
 113 $GLOBALS['config']['PUBSUBHUB_URL'] = '';
 114
 115 /*
 116  * PHP configuration
 117  */
 118 define('shaarli_version', '0.6.0');
 119
 120 // http://server.com/x/shaarli --> /shaarli/
 121 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
 122
 123 // High execution time in case of problematic imports/exports.
 124 ini_set('max_input_time','60');
 125
 126 // Try to set max upload file size and read
 127 ini_set('memory_limit', '128M');
 128 ini_set('post_max_size', '16M');
 129 ini_set('upload_max_filesize', '16M');
 130
 131 // See all error except warnings
 132 error_reporting(E_ALL^E_WARNING);
 133 // See all errors (for debugging only)
 134 //error_reporting(-1);
 135
 136 /*
 137  * User configuration
 138  */
 139 if (is_file($GLOBALS['config']['CONFIG_FILE'])) {
 140     require_once $GLOBALS['config']['CONFIG_FILE'];
 141 }
 142
 143 // Shaarli library
 144 require_once 'application/Cache.php';
 145 require_once 'application/CachedPage.php';
 146 require_once 'application/HttpUtils.php';
 147 require_once 'application/LinkDB.php';
 148 require_once 'application/TimeZone.php';
 149 require_once 'application/Url.php';
 150 require_once 'application/Utils.php';
 151 require_once 'application/Config.php';
 152 require_once 'application/PluginManager.php';
 153 require_once 'application/Router.php';
 154
 155 // Ensure the PHP version is supported
 156 try {
 157     checkPHPVersion('5.3', PHP_VERSION);
 158 } catch(Exception $e) {
 159     header('Content-Type: text/plain; charset=utf-8');
 160     echo $e->getMessage();
 161     exit;
 162 }
 163
 164 // Force cookie path (but do not change lifetime)
 165 $cookie = session_get_cookie_params();
 166 $cookiedir = '';
 167 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
 168     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
 169 }
 170 // Set default cookie expiration and path.
 171 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 172 // Set session parameters on server side.
 173 // If the user does not access any page within this time, his/her session is considered expired.
 174 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 175 // Use cookies to store session.
 176 ini_set('session.use_cookies', 1);
 177 // Force cookies for session (phpsessionID forbidden in URL).
 178 ini_set('session.use_only_cookies', 1);
 179 // Prevent PHP form using sessionID in URL if cookies are disabled.
 180 ini_set('session.use_trans_sid', false);
 181
 182 session_name('shaarli');
 183 // Start session if needed (Some server auto-start sessions).
 184 if (session_id() == '') {
 185     session_start();
 186 }
 187
 188 // Regenerate session ID if invalid or not defined in cookie.
 189 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 190     session_regenerate_id(true);
 191     $_COOKIE['shaarli'] = session_id();
 192 }
 193
 194 include "inc/rain.tpl.class.php"; //include Rain TPL
 195 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
 196 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
 197
 198 $pluginManager = PluginManager::getInstance();
 199 $pluginManager->load($GLOBALS['config']['ENABLED_PLUGINS']);
 200
 201 ob_start();  // Output buffering for the page cache.
 202
 203
 204 // In case stupid admin has left magic_quotes enabled in php.ini:
 205 if (get_magic_quotes_gpc())
 206 {
 207     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 208     $_POST = array_map('stripslashes_deep', $_POST);
 209     $_GET = array_map('stripslashes_deep', $_GET);
 210     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 211 }
 212
 213 // Prevent caching on client side or proxy: (yes, it's ugly)
 214 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 215 header("Cache-Control: no-store, no-cache, must-revalidate");
 216 header("Cache-Control: post-check=0, pre-check=0", false);
 217 header("Pragma: no-cache");
 218
 219 // Directories creations (Note that your web host may require different rights than 705.)
 220 if (!is_writable(realpath(dirname(__FILE__)))) die('<pre>ERROR: Shaarli does not have the right to write in its own directory.</pre>');
 221
 222 // Handling of old config file which do not have the new parameters.
 223 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(index_url($_SERVER));
 224 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 225 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 226 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 227 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 228 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 229 // I really need to rewrite Shaarli with a proper configuation manager.
 230
 231 // Run config screen if first run:
 232 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 233     install();
 234 }
 235
 236 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 237 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 238 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 239
 240 // a token depending of deployment salt, user password, and the current ip
 241 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 242
 243 autoLocale(); // Sniff browser language and set date format accordingly.
 244 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 245
 246 //==================================================================================================
 247 // Checking session state (i.e. is the user still logged in)
 248 //==================================================================================================
 249
 250 function setup_login_state() {
 251         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 252         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 253         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 254             $userIsLoggedIn = true;
 255         }
 256         if (!isset($GLOBALS['login'])) {
 257             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 258             $loginFailure = true;
 259         }
 260         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 261             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 262             !$loginFailure)
 263         {
 264             fillSessionInfo();
 265             $userIsLoggedIn = true;
 266         }
 267         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 268         if (empty($_SESSION['uid']) ||
 269             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 270             time() >= $_SESSION['expires_on'])
 271         {
 272             logout();
 273             $userIsLoggedIn = false;
 274             $loginFailure = true;
 275         }
 276         if (!empty($_SESSION['longlastingsession'])) {
 277             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 278         }
 279         else {
 280             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 281         }
 282         if (!$loginFailure) {
 283             $userIsLoggedIn = true;
 284         }
 285
 286         return $userIsLoggedIn;
 287 }
 288 $userIsLoggedIn = setup_login_state();
 289
 290 // Checks if an update is available for Shaarli.
 291 // (at most once a day, and only for registered user.)
 292 // Output: '' = no new version.
 293 //         other= the available version.
 294 function checkUpdate()
 295 {
 296     if (!isLoggedIn()) return ''; // Do not check versions for visitors.
 297     if (empty($GLOBALS['config']['ENABLE_UPDATECHECK'])) return ''; // Do not check if the user doesn't want to.
 298
 299     // Get latest version number at most once a day.
 300     if (!is_file($GLOBALS['config']['UPDATECHECK_FILENAME']) || (filemtime($GLOBALS['config']['UPDATECHECK_FILENAME'])<time()-($GLOBALS['config']['UPDATECHECK_INTERVAL'])))
 301     {
 302         $version = shaarli_version;
 303         list($headers, $data) = get_http_url('https://raw.githubusercontent.com/shaarli/Shaarli/master/shaarli_version.php', 2);
 304         if (strpos($headers[0], '200 OK') !== false) {
 305             $version = str_replace(' */ ?>', '', str_replace('<?php /* ', '', $data));
 306         }
 307         // If failed, never mind. We don't want to bother the user with that.
 308         file_put_contents($GLOBALS['config']['UPDATECHECK_FILENAME'],$version); // touch file date
 309     }
 310     // Compare versions:
 311     $newestversion=file_get_contents($GLOBALS['config']['UPDATECHECK_FILENAME']);
 312     if (version_compare($newestversion,shaarli_version)==1) return $newestversion;
 313     return '';
 314 }
 315
 316
 317 // -----------------------------------------------------------------------------------------------
 318 // Log to text file
 319 function logm($message)
 320 {
 321     $t = strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n";
 322     file_put_contents($GLOBALS['config']['DATADIR'].'/log.txt',$t,FILE_APPEND);
 323 }
 324
 325 // In a string, converts URLs to clickable links.
 326 // Function inspired from http://www.php.net/manual/en/function.preg-replace.php#85722
 327 function text2clickable($url)
 328 {
 329     $redir = empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'];
 330     return preg_replace('!(((?:https?|ftp|file)://|apt:|magnet:)\S+[[:alnum:]]/?)!si','<a href="'.$redir.'$1" rel="nofollow">$1</a>',$url);
 331 }
 332
 333 // This function inserts &nbsp; where relevant so that multiple spaces are properly displayed in HTML
 334 // even in the absence of <pre>  (This is used in description to keep text formatting)
 335 function keepMultipleSpaces($text)
 336 {
 337     return str_replace('  ',' &nbsp;',$text);
 338
 339 }
 340 // ------------------------------------------------------------------------------------------
 341 // Sniff browser language to display dates in the right format automatically.
 342 // (Note that is may not work on your server if the corresponding local is not installed.)
 343 function autoLocale()
 344 {
 345     $attempts = array('en_US'); // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 346     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 347     {   // (It's a bit crude, but it works very well. Preferred language is always presented first.)
 348         if (preg_match('/([a-z]{2})-?([a-z]{2})?/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) {
 349             $loc = $matches[1] . (!empty($matches[2]) ? '_' . strtoupper($matches[2]) : '');
 350             $attempts = array($loc.'.UTF-8', $loc, str_replace('_', '-', $loc).'.UTF-8', str_replace('_', '-', $loc),
 351                 $loc . '_' . strtoupper($loc).'.UTF-8', $loc . '_' . strtoupper($loc),
 352                 $loc . '_' . $loc.'.UTF-8', $loc . '_' . $loc, $loc . '-' . strtoupper($loc).'.UTF-8',
 353                 $loc . '-' . strtoupper($loc), $loc . '-' . $loc.'.UTF-8', $loc . '-' . $loc);
 354         }
 355     }
 356     setlocale(LC_TIME, $attempts);  // LC_TIME = Set local for date/time format only.
 357 }
 358
 359 // ------------------------------------------------------------------------------------------
 360 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 361 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 362 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 363 function pubsubhub()
 364 {
 365     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 366     {
 367        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 368        $topic_url = array (
 369                        index_url($_SERVER).'?do=atom',
 370                        index_url($_SERVER).'?do=rss'
 371                     );
 372        $p->publish_update($topic_url);
 373     }
 374 }
 375
 376 // ------------------------------------------------------------------------------------------
 377 // Session management
 378
 379 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 380 function allIPs()
 381 {
 382     $ip = $_SERVER["REMOTE_ADDR"];
 383     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 384     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 385     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 386     return $ip;
 387 }
 388
 389 function fillSessionInfo() {
 390         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 391         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 392         $_SESSION['username']=$GLOBALS['login'];
 393         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 394 }
 395
 396 // Check that user/password is correct.
 397 function check_auth($login,$password)
 398 {
 399     $hash = sha1($password.$login.$GLOBALS['salt']);
 400     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 401     {   // Login/password is correct.
 402                 fillSessionInfo();
 403         logm('Login successful');
 404         return True;
 405     }
 406     logm('Login failed for user '.$login);
 407     return False;
 408 }
 409
 410 // Returns true if the user is logged in.
 411 function isLoggedIn()
 412 {
 413     global $userIsLoggedIn;
 414     return $userIsLoggedIn;
 415 }
 416
 417 // Force logout.
 418 function logout() {
 419     if (isset($_SESSION)) {
 420         unset($_SESSION['uid']);
 421         unset($_SESSION['ip']);
 422         unset($_SESSION['username']);
 423         unset($_SESSION['privateonly']);
 424     }
 425     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 426 }
 427
 428
 429 // ------------------------------------------------------------------------------------------
 430 // Brute force protection system
 431 // Several consecutive failed logins will ban the IP address for 30 minutes.
 432 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?>");
 433 include $GLOBALS['config']['IPBANS_FILENAME'];
 434 // Signal a failed login. Will ban the IP if too many failures:
 435 function ban_loginFailed()
 436 {
 437     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 438     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 439     $gb['FAILURES'][$ip]++;
 440     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 441     {
 442         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 443         logm('IP address banned from login');
 444     }
 445     $GLOBALS['IPBANS'] = $gb;
 446     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 447 }
 448
 449 // Signals a successful login. Resets failed login counter.
 450 function ban_loginOk()
 451 {
 452     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 453     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 454     $GLOBALS['IPBANS'] = $gb;
 455     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 456 }
 457
 458 // Checks if the user CAN login. If 'true', the user can try to login.
 459 function ban_canLogin()
 460 {
 461     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 462     if (isset($gb['BANS'][$ip]))
 463     {
 464         // User is banned. Check if the ban has expired:
 465         if ($gb['BANS'][$ip]<=time())
 466         {   // Ban expired, user can try to login again.
 467             logm('Ban lifted.');
 468             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 469             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 470             return true; // Ban has expired, user can login.
 471         }
 472         return false; // User is banned.
 473     }
 474     return true; // User is not banned.
 475 }
 476
 477 // ------------------------------------------------------------------------------------------
 478 // Process login form: Check if login/password is correct.
 479 if (isset($_POST['login']))
 480 {
 481     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 482     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 483     {   // Login/password is OK.
 484         ban_loginOk();
 485         // If user wants to keep the session cookie even after the browser closes:
 486         if (!empty($_POST['longlastingsession']))
 487         {
 488                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 489             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 490             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 491
 492             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 493             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 494             // Note: Never forget the trailing slash on the cookie path!
 495             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 496         }
 497         else // Standard session expiration (=when browser closes)
 498         {
 499             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 500             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 501             session_regenerate_id(true);
 502         }
 503
 504         // Optional redirect after login:
 505         if (isset($_GET['post'])) {
 506             $uri = '?post='. urlencode($_GET['post']);
 507             foreach (array('description', 'source', 'title') as $param) {
 508                 if (!empty($_GET[$param])) {
 509                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 510                 }
 511             }
 512             header('Location: '. $uri);
 513             exit;
 514         }
 515
 516         if (isset($_GET['edit_link'])) {
 517             header('Location: ?edit_link='. escape($_GET['edit_link']));
 518             exit;
 519         }
 520
 521         if (isset($_POST['returnurl'])) {
 522             // Prevent loops over login screen.
 523             if (strpos($_POST['returnurl'], 'do=login') === false) {
 524                 header('Location: '. escape($_POST['returnurl']));
 525                 exit;
 526             }
 527         }
 528         header('Location: ?'); exit;
 529     }
 530     else
 531     {
 532         ban_loginFailed();
 533         $redir = '';
 534         if (isset($_GET['post'])) {
 535             $redir = '?post=' . urlencode($_GET['post']);
 536             foreach (array('description', 'source', 'title') as $param) {
 537                 if (!empty($_GET[$param])) {
 538                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 539                 }
 540             }
 541         }
 542         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 543         exit;
 544     }
 545 }
 546
 547 // ------------------------------------------------------------------------------------------
 548 // Misc utility functions:
 549
 550 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 551 function return_bytes($val)
 552 {
 553     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 554     switch($last)
 555     {
 556         case 'g': $val *= 1024;
 557         case 'm': $val *= 1024;
 558         case 'k': $val *= 1024;
 559     }
 560     return $val;
 561 }
 562
 563 // Try to determine max file size for uploads (POST).
 564 // Returns an integer (in bytes)
 565 function getMaxFileSize()
 566 {
 567     $size1 = return_bytes(ini_get('post_max_size'));
 568     $size2 = return_bytes(ini_get('upload_max_filesize'));
 569     // Return the smaller of two:
 570     $maxsize = min($size1,$size2);
 571     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 572     return $maxsize;
 573 }
 574
 575 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 576     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 577     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 578 function linkdate2timestamp($linkdate)
 579 {
 580     if(strcmp($linkdate, '_000000') !== 0 || !$linkdate){
 581         $Y=$M=$D=$h=$m=$s=0;
 582         $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 583         return mktime($h,$m,$s,$M,$D,$Y);
 584     }
 585     return time();
 586 }
 587
 588 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 589     (used to build the pubDate attribute in RSS feed.)  */
 590 function linkdate2rfc822($linkdate)
 591 {
 592     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 593 }
 594
 595 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 596     (used to build the updated tags in ATOM feed.)  */
 597 function linkdate2iso8601($linkdate)
 598 {
 599     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 600 }
 601
 602 // Extract title from an HTML document.
 603 // (Returns an empty string if not found.)
 604 function html_extract_title($html)
 605 {
 606   return preg_match('!<title>(.*?)</title>!is', $html, $matches) ? trim(str_replace("\n",' ', $matches[1])) : '' ;
 607 }
 608
 609 // ------------------------------------------------------------------------------------------
 610 // Token management for XSRF protection
 611 // Token should be used in any form which acts on data (create,update,delete,import...).
 612 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 613
 614 // Returns a token.
 615 function getToken()
 616 {
 617     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 618     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 619     return $rnd;
 620 }
 621
 622 // Tells if a token is OK. Using this function will destroy the token.
 623 // true=token is OK.
 624 function tokenOk($token)
 625 {
 626     if (isset($_SESSION['tokens'][$token]))
 627     {
 628         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 629         return true; // Token is OK.
 630     }
 631     return false; // Wrong token, or already used.
 632 }
 633
 634 // ------------------------------------------------------------------------------------------
 635 /* This class is in charge of building the final page.
 636    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 637    p = new pageBuilder;
 638    p.assign('myfield','myvalue');
 639    p.renderPage('mytemplate');
 640
 641 */
 642 class pageBuilder
 643 {
 644     private $tpl; // RainTPL template
 645
 646     function __construct()
 647     {
 648         $this->tpl = false;
 649     }
 650
 651     /**
 652      * Initialize all default tpl tags.
 653      */
 654     private function initialize()
 655     {
 656         $this->tpl = new RainTPL;
 657         $this->tpl->assign('newversion', escape(checkUpdate()));
 658         $this->tpl->assign('feedurl', escape(index_url($_SERVER)));
 659         $searchcrits = ''; // Search criteria
 660         if (!empty($_GET['searchtags'])) {
 661             $searchcrits .= '&searchtags=' . urlencode($_GET['searchtags']);
 662         }
 663         elseif (!empty($_GET['searchterm'])) {
 664             $searchcrits .= '&searchterm=' . urlencode($_GET['searchterm']);
 665         }
 666         $this->tpl->assign('searchcrits', $searchcrits);
 667         $this->tpl->assign('source', index_url($_SERVER));
 668         $this->tpl->assign('version', shaarli_version);
 669         $this->tpl->assign('scripturl', index_url($_SERVER));
 670         $this->tpl->assign('pagetitle', 'Shaarli');
 671         $this->tpl->assign('privateonly', !empty($_SESSION['privateonly'])); // Show only private links?
 672         if (!empty($GLOBALS['title'])) {
 673             $this->tpl->assign('pagetitle', $GLOBALS['title']);
 674         }
 675         if (!empty($GLOBALS['titleLink'])) {
 676             $this->tpl->assign('titleLink', $GLOBALS['titleLink']);
 677         }
 678         if (!empty($GLOBALS['pagetitle'])) {
 679             $this->tpl->assign('pagetitle', $GLOBALS['pagetitle']);
 680         }
 681         $this->tpl->assign('shaarlititle', empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title']);
 682         if (!empty($GLOBALS['plugins']['errors'])) {
 683             $this->tpl->assign('plugin_errors', $GLOBALS['plugins']['errors']);
 684         }
 685     }
 686
 687     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 688     public function assign($what,$where)
 689     {
 690         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 691         $this->tpl->assign($what,$where);
 692     }
 693
 694     // Render a specific page (using a template).
 695     // e.g. pb.renderPage('picwall')
 696     public function renderPage($page)
 697     {
 698         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 699         $this->tpl->draw($page);
 700     }
 701 }
 702
 703 // ------------------------------------------------------------------------------------------
 704 // Output the last N links in RSS 2.0 format.
 705 function showRSS()
 706 {
 707     header('Content-Type: application/rss+xml; charset=utf-8');
 708
 709     // $usepermalink : If true, use permalink instead of final link.
 710     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=rss&permalinks
 711     // Also enabled through a config option
 712     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 713
 714     // Cache system
 715     $query = $_SERVER["QUERY_STRING"];
 716     $cache = new CachedPage(
 717         $GLOBALS['config']['PAGECACHE'],
 718         page_url($_SERVER),
 719         startsWith($query,'do=rss') && !isLoggedIn()
 720     );
 721     $cached = $cache->cachedVersion();
 722     if (! empty($cached)) {
 723         echo $cached;
 724         exit;
 725     }
 726
 727     // If cached was not found (or not usable), then read the database and build the response:
 728     $LINKSDB = new LinkDB(
 729         $GLOBALS['config']['DATASTORE'],
 730         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 731         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 732     );
 733     // Read links from database (and filter private links if user it not logged in).
 734
 735     // Optionally filter the results:
 736     $linksToDisplay=array();
 737     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 738     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 739     else $linksToDisplay = $LINKSDB;
 740
 741     $nblinksToDisplay = 50;  // Number of links to display.
 742     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 743     {
 744         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 745     }
 746
 747     $pageaddr=escape(index_url($_SERVER));
 748     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 749     echo '<channel><title>'.$GLOBALS['title'].'</title><link>'.$pageaddr.'</link>';
 750     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 751     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 752     {
 753         echo '<!-- PubSubHubbub Discovery -->';
 754         echo '<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 755         echo '<link rel="self" href="'.$pageaddr.'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 756         echo '<!-- End Of PubSubHubbub Discovery -->';
 757     }
 758     $i=0;
 759     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 760     while ($i<$nblinksToDisplay && $i<count($keys))
 761     {
 762         $link = $linksToDisplay[$keys[$i]];
 763         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 764         $rfc822date = linkdate2rfc822($link['linkdate']);
 765         $absurl = $link['url'];
 766         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 767         if ($usepermalinks===true)
 768             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 769         else
 770             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 771         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.escape($rfc822date)."</pubDate>\n";
 772         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 773         {
 774             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.$pageaddr.'">'.$tag.'</category>'."\n"; }
 775         }
 776
 777         // Add permalink in description
 778         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 779         // If user wants permalinks first, put the final link in description
 780         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 781         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 782         echo '<description><![CDATA['.nl2br(keepMultipleSpaces(text2clickable($link['description']))).$descriptionlink.']]></description>'."\n</item>\n";
 783         $i++;
 784     }
 785     echo '</channel></rss><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 786
 787     $cache->cache(ob_get_contents());
 788     ob_end_flush();
 789     exit;
 790 }
 791
 792 // ------------------------------------------------------------------------------------------
 793 // Output the last N links in ATOM format.
 794 function showATOM()
 795 {
 796     header('Content-Type: application/atom+xml; charset=utf-8');
 797
 798     // $usepermalink : If true, use permalink instead of final link.
 799     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
 800     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 801
 802     // Cache system
 803     $query = $_SERVER["QUERY_STRING"];
 804     $cache = new CachedPage(
 805         $GLOBALS['config']['PAGECACHE'],
 806         page_url($_SERVER),
 807         startsWith($query,'do=atom') && !isLoggedIn()
 808     );
 809     $cached = $cache->cachedVersion();
 810     if (!empty($cached)) {
 811         echo $cached;
 812         exit;
 813     }
 814
 815     // If cached was not found (or not usable), then read the database and build the response:
 816     // Read links from database (and filter private links if used it not logged in).
 817     $LINKSDB = new LinkDB(
 818         $GLOBALS['config']['DATASTORE'],
 819         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 820         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 821     );
 822
 823     // Optionally filter the results:
 824     $linksToDisplay=array();
 825     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 826     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 827     else $linksToDisplay = $LINKSDB;
 828
 829     $nblinksToDisplay = 50;  // Number of links to display.
 830     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 831     {
 832         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 833     }
 834
 835     $pageaddr=escape(index_url($_SERVER));
 836     $latestDate = '';
 837     $entries='';
 838     $i=0;
 839     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 840     while ($i<$nblinksToDisplay && $i<count($keys))
 841     {
 842         $link = $linksToDisplay[$keys[$i]];
 843         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 844         $iso8601date = linkdate2iso8601($link['linkdate']);
 845         $latestDate = max($latestDate,$iso8601date);
 846         $absurl = $link['url'];
 847         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 848         $entries.='<entry><title>'.$link['title'].'</title>';
 849         if ($usepermalinks===true)
 850             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
 851         else
 852             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
 853         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.escape($iso8601date).'</updated>';
 854
 855         // Add permalink in description
 856         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 857         // If user wants permalinks first, put the final link in description
 858         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 859         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 860
 861         $entries.='<content type="html"><![CDATA['.nl2br(keepMultipleSpaces(text2clickable($link['description']))).$descriptionlink."]]></content>\n";
 862         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
 863         {
 864             foreach(explode(' ',$link['tags']) as $tag)
 865                 { $entries.='<category scheme="'.$pageaddr.'" term="'.$tag.'" />'."\n"; }
 866         }
 867         $entries.="</entry>\n";
 868         $i++;
 869     }
 870     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
 871     $feed.='<title>'.$GLOBALS['title'].'</title>';
 872     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.escape($latestDate).'</updated>';
 873     $feed.='<link rel="self" href="'.escape(server_url($_SERVER).$_SERVER["REQUEST_URI"]).'" />';
 874     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 875     {
 876         $feed.='<!-- PubSubHubbub Discovery -->';
 877         $feed.='<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
 878         $feed.='<!-- End Of PubSubHubbub Discovery -->';
 879     }
 880     $feed.='<author><name>'.$pageaddr.'</name><uri>'.$pageaddr.'</uri></author>';
 881     $feed.='<id>'.$pageaddr.'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
 882     $feed.=$entries;
 883     $feed.='</feed><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 884     echo $feed;
 885
 886     $cache->cache(ob_get_contents());
 887     ob_end_flush();
 888     exit;
 889 }
 890
 891 // ------------------------------------------------------------------------------------------
 892 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 893 // Gives the last 7 days (which have links).
 894 // This RSS feed cannot be filtered.
 895 function showDailyRSS() {
 896     // Cache system
 897     $query = $_SERVER["QUERY_STRING"];
 898     $cache = new CachedPage(
 899         $GLOBALS['config']['PAGECACHE'],
 900         page_url($_SERVER),
 901         startsWith($query,'do=dailyrss') && !isLoggedIn()
 902     );
 903     $cached = $cache->cachedVersion();
 904     if (!empty($cached)) {
 905         echo $cached;
 906         exit;
 907     }
 908
 909     // If cached was not found (or not usable), then read the database and build the response:
 910     // Read links from database (and filter private links if used it not logged in).
 911     $LINKSDB = new LinkDB(
 912         $GLOBALS['config']['DATASTORE'],
 913         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
 914         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
 915     );
 916
 917     /* Some Shaarlies may have very few links, so we need to look
 918        back in time (rsort()) until we have enough days ($nb_of_days).
 919     */
 920     $linkdates = array();
 921     foreach ($LINKSDB as $linkdate => $value) {
 922         $linkdates[] = $linkdate;
 923     }
 924     rsort($linkdates);
 925     $nb_of_days = 7; // We take 7 days.
 926     $today = Date('Ymd');
 927     $days = array();
 928
 929     foreach ($linkdates as $linkdate) {
 930         $day = substr($linkdate, 0, 8); // Extract day (without time)
 931         if (strcmp($day,$today) < 0) {
 932             if (empty($days[$day])) {
 933                 $days[$day] = array();
 934             }
 935             $days[$day][] = $linkdate;
 936         }
 937
 938         if (count($days) > $nb_of_days) {
 939             break; // Have we collected enough days?
 940         }
 941     }
 942
 943     // Build the RSS feed.
 944     header('Content-Type: application/rss+xml; charset=utf-8');
 945     $pageaddr = escape(index_url($_SERVER));
 946     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 947     echo '<channel>';
 948     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 949     echo '<link>'. $pageaddr .'</link>';
 950     echo '<description>Daily shared links</description>';
 951     echo '<language>en-en</language>';
 952     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 953
 954     // For each day.
 955     foreach ($days as $day => $linkdates) {
 956         $daydate = linkdate2timestamp($day.'_000000'); // Full text date
 957         $rfc822date = linkdate2rfc822($day.'_000000');
 958         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 959
 960         // Build the HTML body of this RSS entry.
 961         $html = '';
 962         $href = '';
 963         $links = array();
 964
 965         // We pre-format some fields for proper output.
 966         foreach ($linkdates as $linkdate) {
 967             $l = $LINKSDB[$linkdate];
 968             $l['formatedDescription'] = nl2br(keepMultipleSpaces(text2clickable($l['description'])));
 969             $l['thumbnail'] = thumbnail($l['url']);
 970             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
 971             if (startsWith($l['url'], '?')) {
 972                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 973             }
 974             $links[$linkdate] = $l;
 975         }
 976
 977         // Then build the HTML for this day:
 978         $tpl = new RainTPL;
 979         $tpl->assign('title', $GLOBALS['title']);
 980         $tpl->assign('daydate', $daydate);
 981         $tpl->assign('absurl', $absurl);
 982         $tpl->assign('links', $links);
 983         $tpl->assign('rfc822date', escape($rfc822date));
 984         $html = $tpl->draw('dailyrss', $return_string=true);
 985
 986         echo $html . PHP_EOL;
 987     }
 988     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
 989
 990     $cache->cache(ob_get_contents());
 991     ob_end_flush();
 992     exit;
 993 }
 994
 995 // "Daily" page.
 996 function showDaily()
 997 {
 998     $LINKSDB = new LinkDB(
 999         $GLOBALS['config']['DATASTORE'],
1000         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
1001         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
1002     );
1003
1004     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
1005     if (isset($_GET['day'])) $day=$_GET['day'];
1006
1007     $days = $LINKSDB->days();
1008     $i = array_search($day,$days);
1009     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
1010     $previousday='';
1011     $nextday='';
1012     if ($i!==false)
1013     {
1014         if ($i>=1) $previousday=$days[$i-1];
1015         if ($i<count($days)-1) $nextday=$days[$i+1];
1016     }
1017
1018     try {
1019         $linksToDisplay = $LINKSDB->filterDay($day);
1020     } catch (Exception $exc) {
1021         error_log($exc);
1022         $linksToDisplay = array();
1023     }
1024
1025     // We pre-format some fields for proper output.
1026     foreach($linksToDisplay as $key=>$link)
1027     {
1028
1029         $taglist = explode(' ',$link['tags']);
1030         uasort($taglist, 'strcasecmp');
1031         $linksToDisplay[$key]['taglist']=$taglist;
1032         $linksToDisplay[$key]['formatedDescription']=nl2br(keepMultipleSpaces(text2clickable($link['description'])));
1033         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
1034         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
1035     }
1036
1037     /* We need to spread the articles on 3 columns.
1038        I did not want to use a JavaScript lib like http://masonry.desandro.com/
1039        so I manually spread entries with a simple method: I roughly evaluate the
1040        height of a div according to title and description length.
1041     */
1042     $columns=array(array(),array(),array()); // Entries to display, for each column.
1043     $fill=array(0,0,0);  // Rough estimate of columns fill.
1044     foreach($linksToDisplay as $key=>$link)
1045     {
1046         // Roughly estimate length of entry (by counting characters)
1047         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
1048         // Description: 836 characters gives roughly 342 pixel height.
1049         // This is not perfect, but it's usually OK.
1050         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
1051         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
1052         // Then put in column which is the less filled:
1053         $smallest=min($fill); // find smallest value in array.
1054         $index=array_search($smallest,$fill); // find index of this smallest value.
1055         array_push($columns[$index],$link); // Put entry in this column.
1056         $fill[$index]+=$length;
1057     }
1058     $PAGE = new pageBuilder;
1059     $data = array(
1060         'linksToDisplay' => $linksToDisplay,
1061         'linkcount' => count($LINKSDB),
1062         'cols' => $columns,
1063         'day' => linkdate2timestamp($day.'_000000'),
1064         'previousday' => $previousday,
1065         'nextday' => $nextday,
1066     );
1067     $pluginManager = PluginManager::getInstance();
1068     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
1069
1070     foreach ($data as $key => $value) {
1071         $PAGE->assign($key, $value);
1072     }
1073
1074     $PAGE->renderPage('daily');
1075     exit;
1076 }
1077
1078 // Renders the linklist
1079 function showLinkList($PAGE, $LINKSDB) {
1080     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1081     $PAGE->renderPage('linklist');
1082 }
1083
1084
1085 // ------------------------------------------------------------------------------------------
1086 // Render HTML page (according to URL parameters and user rights)
1087 function renderPage()
1088 {
1089     $LINKSDB = new LinkDB(
1090         $GLOBALS['config']['DATASTORE'],
1091         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
1092         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
1093     );
1094
1095     $PAGE = new pageBuilder;
1096
1097     // Determine which page will be rendered.
1098     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
1099     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
1100
1101     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
1102     // Then assign generated data to RainTPL.
1103     $common_hooks = array(
1104         'header',
1105         'footer',
1106         'includes',
1107     );
1108     $pluginManager = PluginManager::getInstance();
1109     foreach($common_hooks as $name) {
1110         $plugin_data = array();
1111         $pluginManager->executeHooks('render_' . $name, $plugin_data,
1112             array(
1113                 'target' => $targetPage,
1114                 'loggedin' => isLoggedIn()
1115             )
1116         );
1117         $PAGE->assign('plugins_' . $name, $plugin_data);
1118     }
1119
1120     // -------- Display login form.
1121     if ($targetPage == Router::$PAGE_LOGIN)
1122     {
1123         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1124         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1125         $PAGE->assign('token',$token);
1126         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
1127         $PAGE->renderPage('loginform');
1128         exit;
1129     }
1130     // -------- User wants to logout.
1131     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1132     {
1133         invalidateCaches($GLOBALS['config']['PAGECACHE']);
1134         logout();
1135         header('Location: ?');
1136         exit;
1137     }
1138
1139     // -------- Picture wall
1140     if ($targetPage == Router::$PAGE_PICWALL)
1141     {
1142         // Optionally filter the results:
1143         $links=array();
1144         if (!empty($_GET['searchterm'])) $links = $LINKSDB->filterFulltext($_GET['searchterm']);
1145         elseif (!empty($_GET['searchtags']))   $links = $LINKSDB->filterTags(trim($_GET['searchtags']));
1146         else $links = $LINKSDB;
1147
1148         $body='';
1149         $linksToDisplay=array();
1150
1151         // Get only links which have a thumbnail.
1152         foreach($links as $link)
1153         {
1154             $permalink='?'.escape(smallhash($link['linkdate']));
1155             $thumb=lazyThumbnail($link['url'],$permalink);
1156             if ($thumb!='') // Only output links which have a thumbnail.
1157             {
1158                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1159                 $linksToDisplay[]=$link; // Add to array.
1160             }
1161         }
1162
1163         $data = array(
1164             'linkcount' => count($LINKSDB),
1165             'linksToDisplay' => $linksToDisplay,
1166         );
1167         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
1168
1169         foreach ($data as $key => $value) {
1170             $PAGE->assign($key, $value);
1171         }
1172
1173         $PAGE->renderPage('picwall');
1174         exit;
1175     }
1176
1177     // -------- Tag cloud
1178     if ($targetPage == Router::$PAGE_TAGCLOUD)
1179     {
1180         $tags= $LINKSDB->allTags();
1181
1182         // We sort tags alphabetically, then choose a font size according to count.
1183         // First, find max value.
1184         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1185         ksort($tags);
1186         $tagList=array();
1187         foreach($tags as $key=>$value)
1188         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1189         {
1190             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1191         }
1192
1193         $data = array(
1194             'linkcount' => count($LINKSDB),
1195             'tags' => $tagList,
1196         );
1197         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
1198
1199         foreach ($data as $key => $value) {
1200             $PAGE->assign($key, $value);
1201         }
1202
1203         $PAGE->renderPage('tagcloud');
1204         exit;
1205     }
1206
1207     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1208     if (isset($_GET['addtag']))
1209     {
1210         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1211         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1212         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1213
1214         // Prevent redirection loop
1215         if (isset($params['addtag'])) {
1216             unset($params['addtag']);
1217         }
1218
1219         // Check if this tag is already in the search query and ignore it if it is.
1220         // Each tag is always separated by a space
1221         if (isset($params['searchtags'])) {
1222             $current_tags = explode(' ', $params['searchtags']);
1223         } else {
1224             $current_tags = array();
1225         }
1226         $addtag = true;
1227         foreach ($current_tags as $value) {
1228             if ($value === $_GET['addtag']) {
1229                 $addtag = false;
1230                 break;
1231             }
1232         }
1233         // Append the tag if necessary
1234         if (empty($params['searchtags'])) {
1235             $params['searchtags'] = trim($_GET['addtag']);
1236         }
1237         else if ($addtag) {
1238             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1239         }
1240
1241         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1242         header('Location: ?'.http_build_query($params));
1243         exit;
1244     }
1245
1246     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1247     if (isset($_GET['removetag'])) {
1248         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1249         if (empty($_SERVER['HTTP_REFERER'])) {
1250             header('Location: ?');
1251             exit;
1252         }
1253
1254         // In case browser does not send HTTP_REFERER
1255         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1256
1257         // Prevent redirection loop
1258         if (isset($params['removetag'])) {
1259             unset($params['removetag']);
1260         }
1261
1262         if (isset($params['searchtags'])) {
1263             $tags = explode(' ',$params['searchtags']);
1264             $tags=array_diff($tags, array($_GET['removetag'])); // Remove value from array $tags.
1265             if (count($tags)==0) {
1266                 unset($params['searchtags']);
1267             } else {
1268                 $params['searchtags'] = implode(' ',$tags);
1269             }
1270             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1271         }
1272         header('Location: ?'.http_build_query($params));
1273         exit;
1274     }
1275
1276     // -------- User wants to change the number of links per page (linksperpage=...)
1277     if (isset($_GET['linksperpage'])) {
1278         if (is_numeric($_GET['linksperpage'])) {
1279             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1280         }
1281
1282         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1283         exit;
1284     }
1285
1286     // -------- User wants to see only private links (toggle)
1287     if (isset($_GET['privateonly'])) {
1288         if (empty($_SESSION['privateonly'])) {
1289             $_SESSION['privateonly'] = 1; // See only private links
1290         } else {
1291             unset($_SESSION['privateonly']); // See all links
1292         }
1293
1294         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1295         exit;
1296     }
1297
1298     // -------- Handle other actions allowed for non-logged in users:
1299     if (!isLoggedIn())
1300     {
1301         // User tries to post new link but is not logged in:
1302         // Show login screen, then redirect to ?post=...
1303         if (isset($_GET['post']))
1304         {
1305             header('Location: ?do=login&post='.urlencode($_GET['post']).(!empty($_GET['title'])?'&title='.urlencode($_GET['title']):'').(!empty($_GET['description'])?'&description='.urlencode($_GET['description']):'').(!empty($_GET['source'])?'&source='.urlencode($_GET['source']):'')); // Redirect to login page, then back to post link.
1306             exit;
1307         }
1308
1309                 // Same case as above except that user tried to access ?do=addlink without being logged in
1310                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1311                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1312                         header('Location: ?do=login&post=');
1313                         exit;
1314                 }
1315         showLinkList($PAGE, $LINKSDB);
1316         if (isset($_GET['edit_link'])) {
1317             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1318             exit;
1319         }
1320
1321         exit; // Never remove this one! All operations below are reserved for logged in user.
1322     }
1323
1324     // -------- All other functions are reserved for the registered user:
1325
1326     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1327     if ($targetPage == Router::$PAGE_TOOLS)
1328     {
1329         $data = array(
1330             'linkcount' => count($LINKSDB),
1331             'pageabsaddr' => index_url($_SERVER),
1332         );
1333         $pluginManager->executeHooks('render_tools', $data);
1334
1335         foreach ($data as $key => $value) {
1336             $PAGE->assign($key, $value);
1337         }
1338
1339         $PAGE->renderPage('tools');
1340         exit;
1341     }
1342
1343     // -------- User wants to change his/her password.
1344     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1345     {
1346         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1347         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1348         {
1349             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1350
1351             // Make sure old password is correct.
1352             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1353             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1354             // Save new password
1355             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1356             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1357             try {
1358                 writeConfig($GLOBALS, isLoggedIn());
1359             }
1360             catch(Exception $e) {
1361                 error_log(
1362                     'ERROR while writing config file after changing password.' . PHP_EOL .
1363                     $e->getMessage()
1364                 );
1365
1366                 // TODO: do not handle exceptions/errors in JS.
1367                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1368                 exit;
1369             }
1370             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1371             exit;
1372         }
1373         else // show the change password form.
1374         {
1375             $PAGE->assign('linkcount',count($LINKSDB));
1376             $PAGE->assign('token',getToken());
1377             $PAGE->renderPage('changepassword');
1378             exit;
1379         }
1380     }
1381
1382     // -------- User wants to change configuration
1383     if ($targetPage == Router::$PAGE_CONFIGURE)
1384     {
1385         if (!empty($_POST['title']) )
1386         {
1387             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1388             $tz = 'UTC';
1389             if (!empty($_POST['continent']) && !empty($_POST['city']))
1390                 if (isTimeZoneValid($_POST['continent'],$_POST['city']))
1391                     $tz = $_POST['continent'].'/'.$_POST['city'];
1392             $GLOBALS['timezone'] = $tz;
1393             $GLOBALS['title']=$_POST['title'];
1394             $GLOBALS['titleLink']=$_POST['titleLink'];
1395             $GLOBALS['redirector']=$_POST['redirector'];
1396             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1397             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1398             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1399             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1400             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1401             try {
1402                 writeConfig($GLOBALS, isLoggedIn());
1403             }
1404             catch(Exception $e) {
1405                 error_log(
1406                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1407                     $e->getMessage()
1408                 );
1409
1410                 // TODO: do not handle exceptions/errors in JS.
1411                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1412                 exit;
1413             }
1414             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1415             exit;
1416         }
1417         else // Show the configuration form.
1418         {
1419             $PAGE->assign('linkcount',count($LINKSDB));
1420             $PAGE->assign('token',getToken());
1421             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1422             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1423             list($timezone_form, $timezone_js) = generateTimeZoneForm($GLOBALS['timezone']);
1424             $PAGE->assign('timezone_form', $timezone_form);
1425             $PAGE->assign('timezone_js',$timezone_js);
1426             $PAGE->renderPage('configure');
1427             exit;
1428         }
1429     }
1430
1431     // -------- User wants to rename a tag or delete it
1432     if ($targetPage == Router::$PAGE_CHANGETAG)
1433     {
1434         if (empty($_POST['fromtag']))
1435         {
1436             $PAGE->assign('linkcount',count($LINKSDB));
1437             $PAGE->assign('token',getToken());
1438             $PAGE->assign('tags', $LINKSDB->allTags());
1439             $PAGE->renderPage('changetag');
1440             exit;
1441         }
1442         if (!tokenOk($_POST['token'])) die('Wrong token.');
1443
1444         // Delete a tag:
1445         if (!empty($_POST['deletetag']) && !empty($_POST['fromtag']))
1446         {
1447             $needle=trim($_POST['fromtag']);
1448             $linksToAlter = $LINKSDB->filterTags($needle,true); // True for case-sensitive tag search.
1449             foreach($linksToAlter as $key=>$value)
1450             {
1451                 $tags = explode(' ',trim($value['tags']));
1452                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1453                 $value['tags']=trim(implode(' ',$tags));
1454                 $LINKSDB[$key]=$value;
1455             }
1456             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1457             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1458             exit;
1459         }
1460
1461         // Rename a tag:
1462         if (!empty($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag']))
1463         {
1464             $needle=trim($_POST['fromtag']);
1465             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
1466             foreach($linksToAlter as $key=>$value)
1467             {
1468                 $tags = explode(' ',trim($value['tags']));
1469                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1470                 $value['tags']=trim(implode(' ',$tags));
1471                 $LINKSDB[$key]=$value;
1472             }
1473             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1474             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1475             exit;
1476         }
1477     }
1478
1479     // -------- User wants to add a link without using the bookmarklet: Show form.
1480     if ($targetPage == Router::$PAGE_ADDLINK)
1481     {
1482         $PAGE->assign('linkcount',count($LINKSDB));
1483         $PAGE->renderPage('addlink');
1484         exit;
1485     }
1486
1487     // -------- User clicked the "Save" button when editing a link: Save link to database.
1488     if (isset($_POST['save_edit']))
1489     {
1490         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1491         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1492         $tags = implode(' ', array_unique(explode(' ', $tags))); // Remove duplicates.
1493         $linkdate=$_POST['lf_linkdate'];
1494         $url = trim($_POST['lf_url']);
1495         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?') && !startsWith($url,'javascript:'))
1496             $url = 'http://'.$url;
1497         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1498                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1499         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1500
1501         $pluginManager->executeHooks('save_link', $link);
1502
1503         $LINKSDB[$linkdate] = $link;
1504         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1505         pubsubhub();
1506
1507         // If we are called from the bookmarklet, we must close the popup:
1508         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1509             echo '<script>self.close();</script>';
1510             exit;
1511         }
1512
1513         $returnurl = !empty($_POST['returnurl']) ? escape($_POST['returnurl']): '?';
1514         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1515         $location .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1516         header('Location: '. $location); // After saving the link, redirect to the page the user was on.
1517         exit;
1518     }
1519
1520     // -------- User clicked the "Cancel" button when editing a link.
1521     if (isset($_POST['cancel_edit']))
1522     {
1523         // If we are called from the bookmarklet, we must close the popup:
1524         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1525         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1526         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1527         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1528         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1529         exit;
1530     }
1531
1532     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1533     if (isset($_POST['delete_link']))
1534     {
1535         if (!tokenOk($_POST['token'])) die('Wrong token.');
1536         // We do not need to ask for confirmation:
1537         // - confirmation is handled by JavaScript
1538         // - we are protected from XSRF by the token.
1539         $linkdate=$_POST['lf_linkdate'];
1540
1541         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1542
1543         unset($LINKSDB[$linkdate]);
1544         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // save to disk
1545
1546         // If we are called from the bookmarklet, we must close the popup:
1547         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1548         // Pick where we're going to redirect
1549         // =============================================================
1550         // Basically, we can't redirect to where we were previously if it was a permalink
1551         // or an edit_link, because it would 404.
1552         // Cases:
1553         //    - /             : nothing in $_GET, redirect to self
1554         //    - /?page        : redirect to self
1555         //    - /?searchterm  : redirect to self (there might be other links)
1556         //    - /?searchtags  : redirect to self
1557         //    - /permalink    : redirect to / (the link does not exist anymore)
1558         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1559         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1560         // redirect is not satisfied, and only then redirect to /
1561         $location = "?";
1562         // Self redirection
1563         if (count($_GET) == 0
1564             || isset($_GET['page'])
1565             || isset($_GET['searchterm'])
1566             || isset($_GET['searchtags'])
1567         ) {
1568             if (isset($_POST['returnurl'])) {
1569                 $location = $_POST['returnurl']; // Handle redirects given by the form
1570             } else {
1571                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1572             }
1573         }
1574
1575         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1576         exit;
1577     }
1578
1579     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1580     if (isset($_GET['edit_link']))
1581     {
1582         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1583         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1584         $data = array(
1585             'linkcount' => count($LINKSDB),
1586             'link' => $link,
1587             'link_is_new' => false,
1588             'token' => getToken(),
1589             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1590             'tags' => $LINKSDB->allTags(),
1591         );
1592         $pluginManager->executeHooks('render_editlink', $data);
1593
1594         foreach ($data as $key => $value) {
1595             $PAGE->assign($key, $value);
1596         }
1597
1598         $PAGE->renderPage('editlink');
1599         exit;
1600     }
1601
1602     // -------- User want to post a new link: Display link edit form.
1603     if (isset($_GET['post'])) {
1604         $url = cleanup_url($_GET['post']);
1605
1606         $link_is_new = false;
1607         // Check if URL is not already in database (in this case, we will edit the existing link)
1608         $link = $LINKSDB->getLinkFromUrl($url);
1609         if (!$link)
1610         {
1611             $link_is_new = true;
1612             $linkdate = strval(date('Ymd_His'));
1613             // Get title if it was provided in URL (by the bookmarklet).
1614             $title = (empty($_GET['title']) ? '' : $_GET['title'] );
1615             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1616             $description = (empty($_GET['description']) ? '' : $_GET['description']);
1617             $tags = (empty($_GET['tags']) ? '' : $_GET['tags'] );
1618             $private = (!empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0);
1619             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1620             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1621                 // Short timeout to keep the application responsive
1622                 list($headers, $data) = get_http_url($url, 4);
1623                 // FIXME: Decode charset according to specified in either 1) HTTP response headers or 2) <head> in html
1624                 if (strpos($headers[0], '200 OK') !== false) {
1625                     // Look for charset in html header.
1626                     preg_match('#<meta .*charset=.*>#Usi', $data, $meta);
1627
1628                     // If found, extract encoding.
1629                     if (!empty($meta[0])) {
1630                         // Get encoding specified in header.
1631                         preg_match('#charset="?(.*)"#si', $meta[0], $enc);
1632                         // If charset not found, use utf-8.
1633                         $html_charset = (!empty($enc[1])) ? strtolower($enc[1]) : 'utf-8';
1634                     }
1635                     else {
1636                         $html_charset = 'utf-8';
1637                     }
1638
1639                     // Extract title
1640                     $title = html_extract_title($data);
1641                     if (!empty($title)) {
1642                         // Re-encode title in utf-8 if necessary.
1643                         $title = ($html_charset == 'iso-8859-1') ? utf8_encode($title) : $title;
1644                     }
1645                 }
1646             }
1647             if ($url == '') {
1648                 $url = '?' . smallHash($linkdate);
1649                 $title = 'Note: ';
1650             }
1651             $link = array(
1652                 'linkdate' => $linkdate,
1653                 'title' => $title,
1654                 'url' => $url,
1655                 'description' => $description,
1656                 'tags' => $tags,
1657                 'private' => $private
1658             );
1659         }
1660
1661         $data = array(
1662             'linkcount' => count($LINKSDB),
1663             'link' => $link,
1664             'link_is_new' => $link_is_new,
1665             'token' => getToken(), // XSRF protection.
1666             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1667             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1668             'tags' => $LINKSDB->allTags(),
1669         );
1670         $pluginManager->executeHooks('render_editlink', $data);
1671
1672         foreach ($data as $key => $value) {
1673             $PAGE->assign($key, $value);
1674         }
1675
1676         $PAGE->renderPage('editlink');
1677         exit;
1678     }
1679
1680     // -------- Export as Netscape Bookmarks HTML file.
1681     if ($targetPage == Router::$PAGE_EXPORT)
1682     {
1683         if (empty($_GET['what']))
1684         {
1685             $PAGE->assign('linkcount',count($LINKSDB));
1686             $PAGE->renderPage('export');
1687             exit;
1688         }
1689         $exportWhat=$_GET['what'];
1690         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1691
1692         header('Content-Type: text/html; charset=utf-8');
1693         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1694         $currentdate=date('Y/m/d H:i:s');
1695         echo <<<HTML
1696 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1697 <!-- This is an automatically generated file.
1698      It will be read and overwritten.
1699      DO NOT EDIT! -->
1700 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1701 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1702 <TITLE>Bookmarks</TITLE>
1703 <H1>Bookmarks</H1>
1704 HTML;
1705         foreach($LINKSDB as $link)
1706         {
1707             if ($exportWhat=='all' ||
1708                ($exportWhat=='private' && $link['private']!=0) ||
1709                ($exportWhat=='public' && $link['private']==0))
1710             {
1711                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1712                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1713                 echo '>'.$link['title']."</A>\n";
1714                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1715             }
1716         }
1717                 exit;
1718     }
1719
1720     // -------- User is uploading a file for import
1721     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1722     {
1723         // If file is too big, some form field may be missing.
1724         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1725         {
1726             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1727             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1728             exit;
1729         }
1730         if (!tokenOk($_POST['token'])) die('Wrong token.');
1731         importFile();
1732         exit;
1733     }
1734
1735     // -------- Show upload/import dialog:
1736     if ($targetPage == Router::$PAGE_IMPORT)
1737     {
1738         $PAGE->assign('linkcount',count($LINKSDB));
1739         $PAGE->assign('token',getToken());
1740         $PAGE->assign('maxfilesize',getMaxFileSize());
1741         $PAGE->renderPage('import');
1742         exit;
1743     }
1744
1745     // -------- Otherwise, simply display search form and links:
1746     showLinkList($PAGE, $LINKSDB);
1747     exit;
1748 }
1749
1750 // -----------------------------------------------------------------------------------------------
1751 // Process the import file form.
1752 function importFile()
1753 {
1754     if (!(isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'])) { die('Not allowed.'); }
1755     $LINKSDB = new LinkDB(
1756         $GLOBALS['config']['DATASTORE'],
1757         isLoggedIn() || $GLOBALS['config']['OPEN_SHAARLI'],
1758         $GLOBALS['config']['HIDE_PUBLIC_LINKS']
1759     );
1760     $filename=$_FILES['filetoupload']['name'];
1761     $filesize=$_FILES['filetoupload']['size'];
1762     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1763     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1764     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1765     $import_count=0;
1766
1767     // Sniff file type:
1768     $type='unknown';
1769     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1770
1771     // Then import the bookmarks.
1772     if ($type=='netscape')
1773     {
1774         // This is a standard Netscape-style bookmark file.
1775         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1776         foreach(explode('<DT>',$data) as $html) // explode is very fast
1777         {
1778             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1779             $d = explode('<DD>',$html);
1780             if (startswith($d[0],'<A '))
1781             {
1782                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1783                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1784                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1785                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1786                 $raw_add_date=0;
1787                 foreach($matches as $m)
1788                 {
1789                     $attr=$m[1]; $value=$m[2];
1790                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1791                     elseif ($attr=='ADD_DATE')
1792                     {
1793                         $raw_add_date=intval($value);
1794                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1795                     }
1796                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1797                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1798                 }
1799                 if ($link['url']!='')
1800                 {
1801                     if ($private==1) $link['private']=1;
1802                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1803                     if ($dblink==false)
1804                     {  // Link not in database, let's import it...
1805                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1806
1807                        // Make sure date/time is not already used by another link.
1808                        // (Some bookmark files have several different links with the same ADD_DATE)
1809                        // We increment date by 1 second until we find a date which is not used in DB.
1810                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1811                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1812                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1813                        $LINKSDB[$link['linkdate']] = $link;
1814                        $import_count++;
1815                     }
1816                     else // Link already present in database.
1817                     {
1818                         if ($overwrite)
1819                         {   // If overwrite is required, we import link data, except date/time.
1820                             $link['linkdate']=$dblink['linkdate'];
1821                             $LINKSDB[$link['linkdate']] = $link;
1822                             $import_count++;
1823                         }
1824                     }
1825
1826                 }
1827             }
1828         }
1829         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1830
1831         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1832     }
1833     else
1834     {
1835         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1836     }
1837 }
1838
1839 // -----------------------------------------------------------------------------------------------
1840 // Template for the list of links (<div id="linklist">)
1841 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1842 function buildLinkList($PAGE,$LINKSDB)
1843 {
1844     // ---- Filter link database according to parameters
1845     $linksToDisplay=array();
1846     $search_type='';
1847     $search_crits='';
1848     if (isset($_GET['searchterm'])) // Fulltext search
1849     {
1850         $linksToDisplay = $LINKSDB->filterFulltext(trim($_GET['searchterm']));
1851         $search_crits=escape(trim($_GET['searchterm']));
1852         $search_type='fulltext';
1853     }
1854     elseif (isset($_GET['searchtags'])) // Search by tag
1855     {
1856         $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
1857         $search_crits=explode(' ',escape(trim($_GET['searchtags'])));
1858         $search_type='tags';
1859     }
1860     elseif (isset($_SERVER['QUERY_STRING']) && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/',$_SERVER['QUERY_STRING'])) // Detect smallHashes in URL
1861     {
1862         $linksToDisplay = $LINKSDB->filterSmallHash(substr(trim($_SERVER["QUERY_STRING"], '/'),0,6));
1863         if (count($linksToDisplay)==0)
1864         {
1865             header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
1866             echo '<h1>404 Not found.</h1>Oh crap. The link you are trying to reach does not exist or has been deleted.';
1867             echo '<br>Would you mind <a href="?">clicking here</a>?';
1868             exit;
1869         }
1870         $search_type='permalink';
1871     }
1872     else
1873         $linksToDisplay = $LINKSDB;  // Otherwise, display without filtering.
1874
1875
1876     // Option: Show only private links
1877     if (!empty($_SESSION['privateonly']))
1878     {
1879         $tmp = array();
1880         foreach($linksToDisplay as $linkdate=>$link)
1881         {
1882             if ($link['private']!=0) $tmp[$linkdate]=$link;
1883         }
1884         $linksToDisplay=$tmp;
1885     }
1886
1887     // ---- Handle paging.
1888     /* Can someone explain to me why you get the following error when using array_keys() on an object which implements the interface ArrayAccess???
1889        "Warning: array_keys() expects parameter 1 to be array, object given in ... "
1890        If my class implements ArrayAccess, why won't array_keys() accept it ?  ( $keys=array_keys($linksToDisplay); )
1891     */
1892     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; } // Stupid and ugly. Thanks PHP.
1893
1894     // If there is only a single link, we change on-the-fly the title of the page.
1895     if (count($linksToDisplay)==1) $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1896
1897     // Select articles according to paging.
1898     $pagecount = ceil(count($keys)/$_SESSION['LINKS_PER_PAGE']);
1899     $pagecount = ($pagecount==0 ? 1 : $pagecount);
1900     $page=( empty($_GET['page']) ? 1 : intval($_GET['page']));
1901     $page = ( $page<1 ? 1 : $page );
1902     $page = ( $page>$pagecount ? $pagecount : $page );
1903     $i = ($page-1)*$_SESSION['LINKS_PER_PAGE']; // Start index.
1904     $end = $i+$_SESSION['LINKS_PER_PAGE'];
1905     $linkDisp=array(); // Links to display
1906     while ($i<$end && $i<count($keys))
1907     {
1908         $link = $linksToDisplay[$keys[$i]];
1909         $link['description']=nl2br(keepMultipleSpaces(text2clickable($link['description'])));
1910         $title=$link['title'];
1911         $classLi =  $i%2!=0 ? '' : 'publicLinkHightLight';
1912         $link['class'] = ($link['private']==0 ? $classLi : 'private');
1913         $link['timestamp']=linkdate2timestamp($link['linkdate']);
1914         $taglist = explode(' ',$link['tags']);
1915         uasort($taglist, 'strcasecmp');
1916         $link['taglist']=$taglist;
1917         $link['shorturl'] = smallHash($link['linkdate']);
1918         if ($link["url"][0] === '?' && // Check for both signs of a note: starting with ? and 7 chars long. I doubt that you'll post any links that look like this.
1919             strlen($link["url"]) === 7) {
1920             $link["url"] = index_url($_SERVER) . $link["url"];
1921         }
1922
1923         $linkDisp[$keys[$i]] = $link;
1924         $i++;
1925     }
1926
1927     // Compute paging navigation
1928     $searchterm= ( empty($_GET['searchterm']) ? '' : '&searchterm='.$_GET['searchterm'] );
1929     $searchtags= ( empty($_GET['searchtags']) ? '' : '&searchtags='.$_GET['searchtags'] );
1930     $paging='';
1931     $previous_page_url=''; if ($i!=count($keys)) $previous_page_url='?page='.($page+1).$searchterm.$searchtags;
1932     $next_page_url='';if ($page>1) $next_page_url='?page='.($page-1).$searchterm.$searchtags;
1933
1934     $token = ''; if (isLoggedIn()) $token=getToken();
1935
1936     // Fill all template fields.
1937     $data = array(
1938         'linkcount' => count($LINKSDB),
1939         'previous_page_url' => $previous_page_url,
1940         'next_page_url' => $next_page_url,
1941         'page_current' => $page,
1942         'page_max' => $pagecount,
1943         'result_count' => count($linksToDisplay),
1944         'search_type' => $search_type,
1945         'search_crits' => $search_crits,
1946         'redirector' => empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'],  // Optional redirector URL.
1947         'token' => $token,
1948         'links' => $linkDisp,
1949         'tags' => $LINKSDB->allTags(),
1950     );
1951
1952     $pluginManager = PluginManager::getInstance();
1953     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
1954
1955     foreach ($data as $key => $value) {
1956         $PAGE->assign($key, $value);
1957     }
1958
1959     return;
1960 }
1961
1962 // Compute the thumbnail for a link.
1963 //
1964 // With a link to the original URL.
1965 // Understands various services (youtube.com...)
1966 // Input: $url = URL for which the thumbnail must be found.
1967 //        $href = if provided, this URL will be followed instead of $url
1968 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1969 // Some of them may be missing.
1970 // Return an empty array if no thumbnail available.
1971 function computeThumbnail($url,$href=false)
1972 {
1973     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
1974     if ($href==false) $href=$url;
1975
1976     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1977     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1978     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1979     $domain = parse_url($url,PHP_URL_HOST);
1980     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1981     {
1982         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1983         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1984                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1985     }
1986     if ($domain=='youtu.be') // Youtube short links
1987     {
1988         $path = parse_url($url,PHP_URL_PATH);
1989         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1990                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1991     }
1992     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1993     {
1994         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1995         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1996                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1997     }
1998
1999     if ($domain=='imgur.com')
2000     {
2001         $path = parse_url($url,PHP_URL_PATH);
2002         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
2003         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
2004                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2005         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
2006                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2007
2008         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
2009                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2010     }
2011     if ($domain=='i.imgur.com')
2012     {
2013         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
2014         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
2015                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2016     }
2017     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
2018     {
2019         if (strpos($url,'dailymotion.com/video/')!==false)
2020         {
2021             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
2022             return array('src'=>$thumburl,
2023                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
2024         }
2025     }
2026     if (endsWith($domain,'.imageshack.us'))
2027     {
2028         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2029         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2030         {
2031             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
2032             return array('src'=>$thumburl,
2033                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
2034         }
2035     }
2036
2037     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
2038     // So we deport the thumbnail generation in order not to slow down page generation
2039     // (and we also cache the thumbnail)
2040
2041     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
2042
2043     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
2044         || $domain=='vimeo.com'
2045         || $domain=='ted.com' || endsWith($domain,'.ted.com')
2046         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
2047     )
2048     {
2049         if ($domain=='vimeo.com')
2050         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
2051             $path = parse_url($url,PHP_URL_PATH);
2052             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
2053         }
2054         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2055         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
2056             $path = parse_url($url,PHP_URL_PATH);
2057             if (!preg_match('!/\d+.+?!',$path)) return array();
2058         }
2059         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2060         {   // Make sure this TED URL points to a video (/talks/...)
2061             $path = parse_url($url,PHP_URL_PATH);
2062             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
2063         }
2064         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2065         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2066                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2067     }
2068
2069     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
2070     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
2071     // But using the extension will do.
2072     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2073     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2074     {
2075         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2076         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2077                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2078     }
2079     return array(); // No thumbnail.
2080
2081 }
2082
2083
2084 // Returns the HTML code to display a thumbnail for a link
2085 // with a link to the original URL.
2086 // Understands various services (youtube.com...)
2087 // Input: $url = URL for which the thumbnail must be found.
2088 //        $href = if provided, this URL will be followed instead of $url
2089 // Returns '' if no thumbnail available.
2090 function thumbnail($url,$href=false)
2091 {
2092     $t = computeThumbnail($url,$href);
2093     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2094
2095     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
2096     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2097     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2098     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2099     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2100     $html.='></a>';
2101     return $html;
2102 }
2103
2104 // Returns the HTML code to display a thumbnail for a link
2105 // for the picture wall (using lazy image loading)
2106 // Understands various services (youtube.com...)
2107 // Input: $url = URL for which the thumbnail must be found.
2108 //        $href = if provided, this URL will be followed instead of $url
2109 // Returns '' if no thumbnail available.
2110 function lazyThumbnail($url,$href=false)
2111 {
2112     $t = computeThumbnail($url,$href);
2113     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2114
2115     $html='<a href="'.escape($t['href']).'">';
2116
2117     // Lazy image
2118     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
2119
2120     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2121     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2122     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2123     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2124     $html.='>';
2125
2126     // No-JavaScript fallback.
2127     $html.='<noscript><img src="'.escape($t['src']).'"';
2128     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2129     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2130     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2131     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2132     $html.='></noscript></a>';
2133
2134     return $html;
2135 }
2136
2137
2138 // -----------------------------------------------------------------------------------------------
2139 // Installation
2140 // This function should NEVER be called if the file data/config.php exists.
2141 function install()
2142 {
2143     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2144     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2145
2146
2147     // This part makes sure sessions works correctly.
2148     // (Because on some hosts, session.save_path may not be set correctly,
2149     // or we may not have write access to it.)
2150     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2151     {   // Step 2: Check if data in session is correct.
2152         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2153         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2154         echo 'It currently points to '.session_save_path().'<br>';
2155         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2156         echo '<br><a href="?">Click to try again.</a></pre>';
2157         die;
2158     }
2159     if (!isset($_SESSION['session_tested']))
2160     {   // Step 1 : Try to store data in session and reload page.
2161         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2162         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
2163     }
2164     if (isset($_GET['test_session']))
2165     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2166         header('Location: '.index_url($_SERVER));
2167     }
2168
2169
2170     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2171     {
2172         $tz = 'UTC';
2173         if (!empty($_POST['continent']) && !empty($_POST['city'])) {
2174             if (isTimeZoneValid($_POST['continent'], $_POST['city'])) {
2175                 $tz = $_POST['continent'].'/'.$_POST['city'];
2176             }
2177         }
2178         $GLOBALS['timezone'] = $tz;
2179         // Everything is ok, let's create config file.
2180         $GLOBALS['login'] = $_POST['setlogin'];
2181         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2182         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2183         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(index_url($_SERVER)) : $_POST['title'] );
2184         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2185         try {
2186             writeConfig($GLOBALS, isLoggedIn());
2187         }
2188         catch(Exception $e) {
2189             error_log(
2190                     'ERROR while writing config file after installation.' . PHP_EOL .
2191                     $e->getMessage()
2192                 );
2193
2194             // TODO: do not handle exceptions/errors in JS.
2195             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2196             exit;
2197         }
2198         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2199         exit;
2200     }
2201
2202     // Display config form:
2203     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2204     $timezone_html = '';
2205     if ($timezone_form != '') {
2206         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2207     }
2208
2209     $PAGE = new pageBuilder;
2210     $PAGE->assign('timezone_html',$timezone_html);
2211     $PAGE->assign('timezone_js',$timezone_js);
2212     $PAGE->renderPage('install');
2213     exit;
2214 }
2215
2216 if (!function_exists('json_encode')) {
2217     function json_encode($data) {
2218         switch ($type = gettype($data)) {
2219             case 'NULL':
2220                 return 'null';
2221             case 'boolean':
2222                 return ($data ? 'true' : 'false');
2223             case 'integer':
2224             case 'double':
2225             case 'float':
2226                 return $data;
2227             case 'string':
2228                 return '"' . addslashes($data) . '"';
2229             case 'object':
2230                 $data = get_object_vars($data);
2231             case 'array':
2232                 $output_index_count = 0;
2233                 $output_indexed = array();
2234                 $output_associative = array();
2235                 foreach ($data as $key => $value) {
2236                     $output_indexed[] = json_encode($value);
2237                     $output_associative[] = json_encode($key) . ':' . json_encode($value);
2238                     if ($output_index_count !== NULL && $output_index_count++ !== $key) {
2239                         $output_index_count = NULL;
2240                     }
2241                 }
2242                 if ($output_index_count !== NULL) {
2243                     return '[' . implode(',', $output_indexed) . ']';
2244                 } else {
2245                     return '{' . implode(',', $output_associative) . '}';
2246                 }
2247             default:
2248                 return ''; // Not supported
2249         }
2250     }
2251 }
2252
2253
2254
2255 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2256    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2257    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2258    This function is called by passing the URL:
2259    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2260    [URL] is the URL of the link (e.g. a flickr page)
2261    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2262    The function below will fetch the image from the webservice and store it in the cache.
2263 */
2264 function genThumbnail()
2265 {
2266     // Make sure the parameters in the URL were generated by us.
2267     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2268     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2269
2270     // Let's see if we don't already have the image for this URL in the cache.
2271     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2272     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2273     {   // We have the thumbnail, just serve it:
2274         header('Content-Type: image/jpeg');
2275         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2276         return;
2277     }
2278     // We may also serve a blank image (if service did not respond)
2279     $blankname=hash('sha1',$_GET['url']).'.gif';
2280     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2281     {
2282         header('Content-Type: image/gif');
2283         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2284         return;
2285     }
2286
2287     // Otherwise, generate the thumbnail.
2288     $url = $_GET['url'];
2289     $domain = parse_url($url,PHP_URL_HOST);
2290
2291     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2292     {
2293         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2294         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2295
2296         // Is this a link to an image, or to a flickr page ?
2297         $imageurl='';
2298         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2299         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2300             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2301             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2302         }
2303         else // This is a flickr page (html)
2304         {
2305             // Get the flickr html page.
2306             list($headers, $data) = get_http_url($url, 20);
2307             if (strpos($headers[0], '200 OK') !== false)
2308             {
2309                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2310                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!',$data,$matches);
2311                 if (!empty($matches[1])) $imageurl=$matches[1];
2312
2313                 // In albums (and some other pages), the link rel="image_src" is not provided,
2314                 // but flickr provides:
2315                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2316                 if ($imageurl=='')
2317                 {
2318                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!',$data,$matches);
2319                     if (!empty($matches[1])) $imageurl=$matches[1];
2320                 }
2321             }
2322         }
2323
2324         if ($imageurl!='')
2325         {   // Let's download the image.
2326             // Image is 240x120, so 10 seconds to download should be enough.
2327             list($headers, $data) = get_http_url($imageurl, 10);
2328             if (strpos($headers[0], '200 OK') !== false) {
2329                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2330                 header('Content-Type: image/jpeg');
2331                 echo $data;
2332                 return;
2333             }
2334         }
2335     }
2336
2337     elseif ($domain=='vimeo.com' )
2338     {
2339         // This is more complex: we have to perform a HTTP request, then parse the result.
2340         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2341         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2342         list($headers, $data) = get_http_url('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2343         if (strpos($headers[0], '200 OK') !== false) {
2344             $t = unserialize($data);
2345             $imageurl = $t[0]['thumbnail_medium'];
2346             // Then we download the image and serve it to our client.
2347             list($headers, $data) = get_http_url($imageurl, 10);
2348             if (strpos($headers[0], '200 OK') !== false) {
2349                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2350                 header('Content-Type: image/jpeg');
2351                 echo $data;
2352                 return;
2353             }
2354         }
2355     }
2356
2357     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2358     {
2359         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2360         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2361         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2362         list($headers, $data) = get_http_url($url, 5);
2363         if (strpos($headers[0], '200 OK') !== false) {
2364             // Extract the link to the thumbnail
2365             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!',$data,$matches);
2366             if (!empty($matches[1]))
2367             {   // Let's download the image.
2368                 $imageurl=$matches[1];
2369                 // No control on image size, so wait long enough
2370                 list($headers, $data) = get_http_url($imageurl, 20);
2371                 if (strpos($headers[0], '200 OK') !== false) {
2372                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2373                     file_put_contents($filepath,$data); // Save image to cache.
2374                     if (resizeImage($filepath))
2375                     {
2376                         header('Content-Type: image/jpeg');
2377                         echo file_get_contents($filepath);
2378                         return;
2379                     }
2380                 }
2381             }
2382         }
2383     }
2384
2385     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2386     {
2387         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2388         // http://xkcd.com/327/
2389         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2390         list($headers, $data) = get_http_url($url, 5);
2391         if (strpos($headers[0], '200 OK') !== false) {
2392             // Extract the link to the thumbnail
2393             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!',$data,$matches);
2394             if (!empty($matches[1]))
2395             {   // Let's download the image.
2396                 $imageurl=$matches[1];
2397                 // No control on image size, so wait long enough
2398                 list($headers, $data) = get_http_url($imageurl, 20);
2399                 if (strpos($headers[0], '200 OK') !== false) {
2400                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2401                     file_put_contents($filepath,$data); // Save image to cache.
2402                     if (resizeImage($filepath))
2403                     {
2404                         header('Content-Type: image/jpeg');
2405                         echo file_get_contents($filepath);
2406                         return;
2407                     }
2408                 }
2409             }
2410         }
2411     }
2412
2413     else
2414     {
2415         // For all other domains, we try to download the image and make a thumbnail.
2416         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2417         list($headers, $data) = get_http_url($url, 30);
2418         if (strpos($headers[0], '200 OK') !== false) {
2419             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2420             file_put_contents($filepath,$data); // Save image to cache.
2421             if (resizeImage($filepath))
2422             {
2423                 header('Content-Type: image/jpeg');
2424                 echo file_get_contents($filepath);
2425                 return;
2426             }
2427         }
2428     }
2429
2430
2431     // Otherwise, return an empty image (8x8 transparent gif)
2432     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2433     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2434     header('Content-Type: image/gif');
2435     echo $blankgif;
2436 }
2437
2438 // Make a thumbnail of the image (to width: 120 pixels)
2439 // Returns true if success, false otherwise.
2440 function resizeImage($filepath)
2441 {
2442     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2443
2444     // Trick: some stupid people rename GIF as JPEG... or else.
2445     // So we really try to open each image type whatever the extension is.
2446     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2447     $im=false;
2448     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2449     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2450     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2451     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2452     $w = imagesx($im);
2453     $h = imagesy($im);
2454     $ystart = 0; $yheight=$h;
2455     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2456     $nw = 120;   // Desired width
2457     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2458     // Resize image:
2459     $im2 = imagecreatetruecolor($nw,$nh);
2460     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2461     imageinterlace($im2,true); // For progressive JPEG.
2462     $tempname=$filepath.'_TEMP.jpg';
2463     imagejpeg($im2, $tempname, 90);
2464     imagedestroy($im);
2465     imagedestroy($im2);
2466     unlink($filepath);
2467     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2468     return true;
2469 }
2470
2471 try {
2472     mergeDeprecatedConfig($GLOBALS, isLoggedIn());
2473 } catch(Exception $e) {
2474     error_log(
2475         'ERROR while merging deprecated options.php file.' . PHP_EOL .
2476         $e->getMessage()
2477     );
2478 }
2479
2480 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2481 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2482 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2483 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2484 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=daily')) { showDaily(); exit; }
2485 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2486 renderPage();
2487 ?>