index.php

   1 <?php
   2 /**
   3  * Shaarli v0.6.5 - 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 // Processed updates file.
  48 $GLOBALS['config']['UPDATES_FILE'] = $GLOBALS['config']['DATADIR'].'/updates.txt';
  49
  50 // Access log
  51 $GLOBALS['config']['LOG_FILE'] = $GLOBALS['config']['DATADIR'].'/log.txt';
  52
  53 // For updates check of Shaarli
  54 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt';
  55
  56 // Set ENABLE_UPDATECHECK to disabled by default.
  57 $GLOBALS['config']['ENABLE_UPDATECHECK'] = false;
  58
  59 // RainTPL cache directory (keep the trailing slash!)
  60 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp/';
  61 // Raintpl template directory (keep the trailing slash!)
  62 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/';
  63
  64 // Thumbnail cache directory
  65 $GLOBALS['config']['CACHEDIR'] = 'cache';
  66
  67 // Atom & RSS feed cache directory
  68 $GLOBALS['config']['PAGECACHE'] = 'pagecache';
  69
  70 /*
  71  * Global configuration
  72  */
  73 // Ban IP after this many failures
  74 $GLOBALS['config']['BAN_AFTER'] = 4;
  75 // Ban duration for IP address after login failures (in seconds)
  76 $GLOBALS['config']['BAN_DURATION'] = 1800;
  77
  78 // Feed options
  79 // Enable RSS permalinks by default.
  80 // This corresponds to the default behavior of shaarli before this was added as an option.
  81 $GLOBALS['config']['ENABLE_RSS_PERMALINKS'] = true;
  82 // If true, an extra "ATOM feed" button will be displayed in the toolbar
  83 $GLOBALS['config']['SHOW_ATOM'] = false;
  84
  85 // Link display options
  86 $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = false;
  87 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false;
  88 $GLOBALS['config']['LINKS_PER_PAGE'] = 20;
  89
  90 // Open Shaarli (true): anyone can add/edit/delete links without having to login
  91 $GLOBALS['config']['OPEN_SHAARLI'] = false;
  92
  93 // Thumbnails
  94 // Display thumbnails in links
  95 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true;
  96 // Store thumbnails in a local cache
  97 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true;
  98
  99 // Update check frequency for Shaarli. 86400 seconds=24 hours
 100 $GLOBALS['config']['UPDATECHECK_BRANCH'] = 'stable';
 101 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400;
 102
 103 $GLOBALS['config']['REDIRECTOR_URLENCODE'] = true;
 104
 105 /*
 106  * Plugin configuration
 107  *
 108  * Warning: order matters!
 109  *
 110  * These settings may be be overriden in:
 111  *  - data/config.php
 112  *  - each plugin's configuration file
 113  */
 114 //$GLOBALS['config']['ENABLED_PLUGINS'] = array(
 115 //    'qrcode', 'archiveorg', 'readityourself', 'demo_plugin', 'playvideos',
 116 //    'wallabag', 'markdown', 'addlink_toolbar',
 117 //);
 118 $GLOBALS['config']['ENABLED_PLUGINS'] = array('qrcode');
 119
 120 // Initialize plugin parameters array.
 121 $GLOBALS['plugins'] = array();
 122
 123 // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
 124 $GLOBALS['config']['PUBSUBHUB_URL'] = '';
 125
 126 /*
 127  * PHP configuration
 128  */
 129 define('shaarli_version', '0.6.5');
 130
 131 // http://server.com/x/shaarli --> /shaarli/
 132 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
 133
 134 // High execution time in case of problematic imports/exports.
 135 ini_set('max_input_time','60');
 136
 137 // Try to set max upload file size and read
 138 ini_set('memory_limit', '128M');
 139 ini_set('post_max_size', '16M');
 140 ini_set('upload_max_filesize', '16M');
 141
 142 // See all error except warnings
 143 error_reporting(E_ALL^E_WARNING);
 144 // See all errors (for debugging only)
 145 //error_reporting(-1);
 146
 147 /*
 148  * User configuration
 149  */
 150 if (is_file($GLOBALS['config']['CONFIG_FILE'])) {
 151     require_once $GLOBALS['config']['CONFIG_FILE'];
 152 }
 153
 154 // Shaarli library
 155 require_once 'application/ApplicationUtils.php';
 156 require_once 'application/Cache.php';
 157 require_once 'application/CachedPage.php';
 158 require_once 'application/FeedBuilder.php';
 159 require_once 'application/FileUtils.php';
 160 require_once 'application/HttpUtils.php';
 161 require_once 'application/LinkDB.php';
 162 require_once 'application/LinkFilter.php';
 163 require_once 'application/LinkUtils.php';
 164 require_once 'application/NetscapeBookmarkUtils.php';
 165 require_once 'application/TimeZone.php';
 166 require_once 'application/Url.php';
 167 require_once 'application/Utils.php';
 168 require_once 'application/Config.php';
 169 require_once 'application/PluginManager.php';
 170 require_once 'application/Router.php';
 171 require_once 'application/Updater.php';
 172
 173 // Ensure the PHP version is supported
 174 try {
 175     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
 176 } catch(Exception $exc) {
 177     header('Content-Type: text/plain; charset=utf-8');
 178     echo $exc->getMessage();
 179     exit;
 180 }
 181
 182 // Force cookie path (but do not change lifetime)
 183 $cookie = session_get_cookie_params();
 184 $cookiedir = '';
 185 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
 186     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
 187 }
 188 // Set default cookie expiration and path.
 189 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 190 // Set session parameters on server side.
 191 // If the user does not access any page within this time, his/her session is considered expired.
 192 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 193 // Use cookies to store session.
 194 ini_set('session.use_cookies', 1);
 195 // Force cookies for session (phpsessionID forbidden in URL).
 196 ini_set('session.use_only_cookies', 1);
 197 // Prevent PHP form using sessionID in URL if cookies are disabled.
 198 ini_set('session.use_trans_sid', false);
 199
 200 session_name('shaarli');
 201 // Start session if needed (Some server auto-start sessions).
 202 if (session_id() == '') {
 203     session_start();
 204 }
 205
 206 // Regenerate session ID if invalid or not defined in cookie.
 207 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 208     session_regenerate_id(true);
 209     $_COOKIE['shaarli'] = session_id();
 210 }
 211
 212 include "inc/rain.tpl.class.php"; //include Rain TPL
 213 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
 214 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
 215
 216 $pluginManager = PluginManager::getInstance();
 217 $pluginManager->load($GLOBALS['config']['ENABLED_PLUGINS']);
 218
 219 ob_start();  // Output buffering for the page cache.
 220
 221
 222 // In case stupid admin has left magic_quotes enabled in php.ini:
 223 if (get_magic_quotes_gpc())
 224 {
 225     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 226     $_POST = array_map('stripslashes_deep', $_POST);
 227     $_GET = array_map('stripslashes_deep', $_GET);
 228     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 229 }
 230
 231 // Prevent caching on client side or proxy: (yes, it's ugly)
 232 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 233 header("Cache-Control: no-store, no-cache, must-revalidate");
 234 header("Cache-Control: post-check=0, pre-check=0", false);
 235 header("Pragma: no-cache");
 236
 237 // Handling of old config file which do not have the new parameters.
 238 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(index_url($_SERVER));
 239 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 240 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 241 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 242 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 243 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 244 // I really need to rewrite Shaarli with a proper configuation manager.
 245
 246 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 247     // Ensure Shaarli has proper access to its resources
 248     $errors = ApplicationUtils::checkResourcePermissions($GLOBALS['config']);
 249
 250     if ($errors != array()) {
 251         $message = '<p>Insufficient permissions:</p><ul>';
 252
 253         foreach ($errors as $error) {
 254             $message .= '<li>'.$error.'</li>';
 255         }
 256         $message .= '</ul>';
 257
 258         header('Content-Type: text/html; charset=utf-8');
 259         echo $message;
 260         exit;
 261     }
 262
 263     // Display the installation form if no existing config is found
 264     install();
 265 }
 266
 267 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 268 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 269 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 270
 271 // a token depending of deployment salt, user password, and the current ip
 272 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 273
 274 // Sniff browser language and set date format accordingly.
 275 if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
 276     autoLocale($_SERVER['HTTP_ACCEPT_LANGUAGE']);
 277 }
 278 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 279
 280 //==================================================================================================
 281 // Checking session state (i.e. is the user still logged in)
 282 //==================================================================================================
 283
 284 function setup_login_state() {
 285         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 286             return true;
 287         }
 288         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 289         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 290         if (!isset($GLOBALS['login'])) {
 291             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 292             $loginFailure = true;
 293         }
 294         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 295             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 296             !$loginFailure)
 297         {
 298             fillSessionInfo();
 299             $userIsLoggedIn = true;
 300         }
 301         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 302         if (empty($_SESSION['uid']) ||
 303             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 304             time() >= $_SESSION['expires_on'])
 305         {
 306             logout();
 307             $userIsLoggedIn = false;
 308             $loginFailure = true;
 309         }
 310         if (!empty($_SESSION['longlastingsession'])) {
 311             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 312         }
 313         else {
 314             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 315         }
 316         if (!$loginFailure) {
 317             $userIsLoggedIn = true;
 318         }
 319
 320         return $userIsLoggedIn;
 321 }
 322 $userIsLoggedIn = setup_login_state();
 323
 324 // ------------------------------------------------------------------------------------------
 325 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 326 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 327 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 328 function pubsubhub()
 329 {
 330     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 331     {
 332        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 333        $topic_url = array (
 334                        index_url($_SERVER).'?do=atom',
 335                        index_url($_SERVER).'?do=rss'
 336                     );
 337        $p->publish_update($topic_url);
 338     }
 339 }
 340
 341 // ------------------------------------------------------------------------------------------
 342 // Session management
 343
 344 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 345 function allIPs()
 346 {
 347     $ip = $_SERVER["REMOTE_ADDR"];
 348     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 349     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 350     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 351     return $ip;
 352 }
 353
 354 function fillSessionInfo() {
 355         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 356         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 357         $_SESSION['username']=$GLOBALS['login'];
 358         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 359 }
 360
 361 // Check that user/password is correct.
 362 function check_auth($login,$password)
 363 {
 364     $hash = sha1($password.$login.$GLOBALS['salt']);
 365     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 366     {   // Login/password is correct.
 367                 fillSessionInfo();
 368         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login successful');
 369         return True;
 370     }
 371     logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login failed for user '.$login);
 372     return False;
 373 }
 374
 375 // Returns true if the user is logged in.
 376 function isLoggedIn()
 377 {
 378     global $userIsLoggedIn;
 379     return $userIsLoggedIn;
 380 }
 381
 382 // Force logout.
 383 function logout() {
 384     if (isset($_SESSION)) {
 385         unset($_SESSION['uid']);
 386         unset($_SESSION['ip']);
 387         unset($_SESSION['username']);
 388         unset($_SESSION['privateonly']);
 389     }
 390     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 391 }
 392
 393
 394 // ------------------------------------------------------------------------------------------
 395 // Brute force protection system
 396 // Several consecutive failed logins will ban the IP address for 30 minutes.
 397 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?>");
 398 include $GLOBALS['config']['IPBANS_FILENAME'];
 399 // Signal a failed login. Will ban the IP if too many failures:
 400 function ban_loginFailed()
 401 {
 402     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 403     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 404     $gb['FAILURES'][$ip]++;
 405     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 406     {
 407         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 408         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'IP address banned from login');
 409     }
 410     $GLOBALS['IPBANS'] = $gb;
 411     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 412 }
 413
 414 // Signals a successful login. Resets failed login counter.
 415 function ban_loginOk()
 416 {
 417     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 418     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 419     $GLOBALS['IPBANS'] = $gb;
 420     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 421 }
 422
 423 // Checks if the user CAN login. If 'true', the user can try to login.
 424 function ban_canLogin()
 425 {
 426     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 427     if (isset($gb['BANS'][$ip]))
 428     {
 429         // User is banned. Check if the ban has expired:
 430         if ($gb['BANS'][$ip]<=time())
 431         {   // Ban expired, user can try to login again.
 432             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Ban lifted.');
 433             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 434             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 435             return true; // Ban has expired, user can login.
 436         }
 437         return false; // User is banned.
 438     }
 439     return true; // User is not banned.
 440 }
 441
 442 // ------------------------------------------------------------------------------------------
 443 // Process login form: Check if login/password is correct.
 444 if (isset($_POST['login']))
 445 {
 446     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 447     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 448     {   // Login/password is OK.
 449         ban_loginOk();
 450         // If user wants to keep the session cookie even after the browser closes:
 451         if (!empty($_POST['longlastingsession']))
 452         {
 453                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 454             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 455             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 456
 457             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 458             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 459             // Note: Never forget the trailing slash on the cookie path!
 460             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 461         }
 462         else // Standard session expiration (=when browser closes)
 463         {
 464             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 465             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 466             session_regenerate_id(true);
 467         }
 468
 469         // Optional redirect after login:
 470         if (isset($_GET['post'])) {
 471             $uri = '?post='. urlencode($_GET['post']);
 472             foreach (array('description', 'source', 'title') as $param) {
 473                 if (!empty($_GET[$param])) {
 474                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 475                 }
 476             }
 477             header('Location: '. $uri);
 478             exit;
 479         }
 480
 481         if (isset($_GET['edit_link'])) {
 482             header('Location: ?edit_link='. escape($_GET['edit_link']));
 483             exit;
 484         }
 485
 486         if (isset($_POST['returnurl'])) {
 487             // Prevent loops over login screen.
 488             if (strpos($_POST['returnurl'], 'do=login') === false) {
 489                 header('Location: '. generateLocation($_POST['returnurl'], $_SERVER['HTTP_HOST']));
 490                 exit;
 491             }
 492         }
 493         header('Location: ?'); exit;
 494     }
 495     else
 496     {
 497         ban_loginFailed();
 498         $redir = '';
 499         if (isset($_GET['post'])) {
 500             $redir = '?post=' . urlencode($_GET['post']);
 501             foreach (array('description', 'source', 'title') as $param) {
 502                 if (!empty($_GET[$param])) {
 503                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 504                 }
 505             }
 506         }
 507         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 508         exit;
 509     }
 510 }
 511
 512 // ------------------------------------------------------------------------------------------
 513 // Misc utility functions:
 514
 515 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 516 function return_bytes($val)
 517 {
 518     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 519     switch($last)
 520     {
 521         case 'g': $val *= 1024;
 522         case 'm': $val *= 1024;
 523         case 'k': $val *= 1024;
 524     }
 525     return $val;
 526 }
 527
 528 // Try to determine max file size for uploads (POST).
 529 // Returns an integer (in bytes)
 530 function getMaxFileSize()
 531 {
 532     $size1 = return_bytes(ini_get('post_max_size'));
 533     $size2 = return_bytes(ini_get('upload_max_filesize'));
 534     // Return the smaller of two:
 535     $maxsize = min($size1,$size2);
 536     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 537     return $maxsize;
 538 }
 539
 540 // ------------------------------------------------------------------------------------------
 541 // Token management for XSRF protection
 542 // Token should be used in any form which acts on data (create,update,delete,import...).
 543 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 544
 545 // Returns a token.
 546 function getToken()
 547 {
 548     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 549     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 550     return $rnd;
 551 }
 552
 553 // Tells if a token is OK. Using this function will destroy the token.
 554 // true=token is OK.
 555 function tokenOk($token)
 556 {
 557     if (isset($_SESSION['tokens'][$token]))
 558     {
 559         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 560         return true; // Token is OK.
 561     }
 562     return false; // Wrong token, or already used.
 563 }
 564
 565 // ------------------------------------------------------------------------------------------
 566 /* This class is in charge of building the final page.
 567    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 568    p = new pageBuilder;
 569    p.assign('myfield','myvalue');
 570    p.renderPage('mytemplate');
 571
 572 */
 573 class pageBuilder
 574 {
 575     private $tpl; // RainTPL template
 576
 577     function __construct()
 578     {
 579         $this->tpl = false;
 580     }
 581
 582     /**
 583      * Initialize all default tpl tags.
 584      */
 585     private function initialize()
 586     {
 587         $this->tpl = new RainTPL;
 588
 589         try {
 590             $version = ApplicationUtils::checkUpdate(
 591                 shaarli_version,
 592                 $GLOBALS['config']['UPDATECHECK_FILENAME'],
 593                 $GLOBALS['config']['UPDATECHECK_INTERVAL'],
 594                 $GLOBALS['config']['ENABLE_UPDATECHECK'],
 595                 isLoggedIn(),
 596                 $GLOBALS['config']['UPDATECHECK_BRANCH']
 597             );
 598             $this->tpl->assign('newVersion', escape($version));
 599             $this->tpl->assign('versionError', '');
 600
 601         } catch (Exception $exc) {
 602             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], $exc->getMessage());
 603             $this->tpl->assign('newVersion', '');
 604             $this->tpl->assign('versionError', escape($exc->getMessage()));
 605         }
 606
 607         $this->tpl->assign('feedurl', escape(index_url($_SERVER)));
 608         $searchcrits = ''; // Search criteria
 609         if (!empty($_GET['searchtags'])) {
 610             $searchcrits .= '&searchtags=' . urlencode($_GET['searchtags']);
 611         }
 612         if (!empty($_GET['searchterm'])) {
 613             $searchcrits .= '&searchterm=' . urlencode($_GET['searchterm']);
 614         }
 615         $this->tpl->assign('searchcrits', $searchcrits);
 616         $this->tpl->assign('source', index_url($_SERVER));
 617         $this->tpl->assign('version', shaarli_version);
 618         $this->tpl->assign('scripturl', index_url($_SERVER));
 619         $this->tpl->assign('pagetitle', 'Shaarli');
 620         $this->tpl->assign('privateonly', !empty($_SESSION['privateonly'])); // Show only private links?
 621         if (!empty($GLOBALS['title'])) {
 622             $this->tpl->assign('pagetitle', $GLOBALS['title']);
 623         }
 624         if (!empty($GLOBALS['titleLink'])) {
 625             $this->tpl->assign('titleLink', $GLOBALS['titleLink']);
 626         }
 627         if (!empty($GLOBALS['pagetitle'])) {
 628             $this->tpl->assign('pagetitle', $GLOBALS['pagetitle']);
 629         }
 630         $this->tpl->assign('shaarlititle', empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title']);
 631         if (!empty($GLOBALS['plugin_errors'])) {
 632             $this->tpl->assign('plugin_errors', $GLOBALS['plugin_errors']);
 633         }
 634     }
 635
 636     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 637     public function assign($what,$where)
 638     {
 639         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 640         $this->tpl->assign($what,$where);
 641     }
 642
 643     /**
 644      * Assign an array of data to the template builder.
 645      *
 646      * @param array $data Data to assign.
 647      *
 648      * @return false if invalid data.
 649      */
 650     public function assignAll($data)
 651     {
 652         // Lazy initialization
 653         if ($this->tpl === false) {
 654             $this->initialize();
 655         }
 656
 657         if (empty($data) || !is_array($data)){
 658             return false;
 659         }
 660
 661         foreach ($data as $key => $value) {
 662             $this->assign($key, $value);
 663         }
 664     }
 665
 666     // Render a specific page (using a template).
 667     // e.g. pb.renderPage('picwall')
 668     public function renderPage($page)
 669     {
 670         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 671         $this->tpl->draw($page);
 672     }
 673
 674     /**
 675     * Render a 404 page (uses the template : tpl/404.tpl)
 676     *
 677     * usage : $PAGE->render404('The link was deleted')
 678     * @param string $message A messate to display what is not found
 679     */
 680     public function render404($message='The page you are trying to reach does not exist or has been deleted.') {
 681         header($_SERVER['SERVER_PROTOCOL'] . ' 404 Not Found');
 682         $this->tpl->assign('error_message', $message);
 683         $this->renderPage('404');
 684     }
 685 }
 686
 687 // ------------------------------------------------------------------------------------------
 688 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 689 // Gives the last 7 days (which have links).
 690 // This RSS feed cannot be filtered.
 691 function showDailyRSS() {
 692     // Cache system
 693     $query = $_SERVER["QUERY_STRING"];
 694     $cache = new CachedPage(
 695         $GLOBALS['config']['PAGECACHE'],
 696         page_url($_SERVER),
 697         startsWith($query,'do=dailyrss') && !isLoggedIn()
 698     );
 699     $cached = $cache->cachedVersion();
 700     if (!empty($cached)) {
 701         echo $cached;
 702         exit;
 703     }
 704
 705     // If cached was not found (or not usable), then read the database and build the response:
 706     // Read links from database (and filter private links if used it not logged in).
 707     $LINKSDB = new LinkDB(
 708         $GLOBALS['config']['DATASTORE'],
 709         isLoggedIn(),
 710         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 711         $GLOBALS['redirector'],
 712         $GLOBALS['config']['REDIRECTOR_URLENCODE']
 713     );
 714
 715     /* Some Shaarlies may have very few links, so we need to look
 716        back in time (rsort()) until we have enough days ($nb_of_days).
 717     */
 718     $linkdates = array();
 719     foreach ($LINKSDB as $linkdate => $value) {
 720         $linkdates[] = $linkdate;
 721     }
 722     rsort($linkdates);
 723     $nb_of_days = 7; // We take 7 days.
 724     $today = Date('Ymd');
 725     $days = array();
 726
 727     foreach ($linkdates as $linkdate) {
 728         $day = substr($linkdate, 0, 8); // Extract day (without time)
 729         if (strcmp($day,$today) < 0) {
 730             if (empty($days[$day])) {
 731                 $days[$day] = array();
 732             }
 733             $days[$day][] = $linkdate;
 734         }
 735
 736         if (count($days) > $nb_of_days) {
 737             break; // Have we collected enough days?
 738         }
 739     }
 740
 741     // Build the RSS feed.
 742     header('Content-Type: application/rss+xml; charset=utf-8');
 743     $pageaddr = escape(index_url($_SERVER));
 744     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 745     echo '<channel>';
 746     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 747     echo '<link>'. $pageaddr .'</link>';
 748     echo '<description>Daily shared links</description>';
 749     echo '<language>en-en</language>';
 750     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 751
 752     // For each day.
 753     foreach ($days as $day => $linkdates) {
 754         $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 755         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 756
 757         // Build the HTML body of this RSS entry.
 758         $html = '';
 759         $href = '';
 760         $links = array();
 761
 762         // We pre-format some fields for proper output.
 763         foreach ($linkdates as $linkdate) {
 764             $l = $LINKSDB[$linkdate];
 765             $l['formatedDescription'] = format_description($l['description'], $GLOBALS['redirector']);
 766             $l['thumbnail'] = thumbnail($l['url']);
 767             $l_date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $l['linkdate']);
 768             $l['timestamp'] = $l_date->getTimestamp();
 769             if (startsWith($l['url'], '?')) {
 770                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 771             }
 772             $links[$linkdate] = $l;
 773         }
 774
 775         // Then build the HTML for this day:
 776         $tpl = new RainTPL;
 777         $tpl->assign('title', $GLOBALS['title']);
 778         $tpl->assign('daydate', $dayDate->getTimestamp());
 779         $tpl->assign('absurl', $absurl);
 780         $tpl->assign('links', $links);
 781         $tpl->assign('rssdate', escape($dayDate->format(DateTime::RSS)));
 782         $html = $tpl->draw('dailyrss', $return_string=true);
 783
 784         echo $html . PHP_EOL;
 785     }
 786     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
 787
 788     $cache->cache(ob_get_contents());
 789     ob_end_flush();
 790     exit;
 791 }
 792
 793 /**
 794  * Show the 'Daily' page.
 795  *
 796  * @param PageBuilder $pageBuilder Template engine wrapper.
 797  * @param LinkDB $LINKSDB LinkDB instance.
 798  */
 799 function showDaily($pageBuilder, $LINKSDB)
 800 {
 801     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 802     if (isset($_GET['day'])) $day=$_GET['day'];
 803
 804     $days = $LINKSDB->days();
 805     $i = array_search($day,$days);
 806     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
 807     $previousday='';
 808     $nextday='';
 809     if ($i!==false)
 810     {
 811         if ($i>=1) $previousday=$days[$i-1];
 812         if ($i<count($days)-1) $nextday=$days[$i+1];
 813     }
 814
 815     try {
 816         $linksToDisplay = $LINKSDB->filterDay($day);
 817     } catch (Exception $exc) {
 818         error_log($exc);
 819         $linksToDisplay = array();
 820     }
 821
 822     // We pre-format some fields for proper output.
 823     foreach($linksToDisplay as $key=>$link)
 824     {
 825
 826         $taglist = explode(' ',$link['tags']);
 827         uasort($taglist, 'strcasecmp');
 828         $linksToDisplay[$key]['taglist']=$taglist;
 829         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $GLOBALS['redirector']);
 830         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
 831         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
 832         $linksToDisplay[$key]['timestamp'] = $date->getTimestamp();
 833     }
 834
 835     /* We need to spread the articles on 3 columns.
 836        I did not want to use a JavaScript lib like http://masonry.desandro.com/
 837        so I manually spread entries with a simple method: I roughly evaluate the
 838        height of a div according to title and description length.
 839     */
 840     $columns=array(array(),array(),array()); // Entries to display, for each column.
 841     $fill=array(0,0,0);  // Rough estimate of columns fill.
 842     foreach($linksToDisplay as $key=>$link)
 843     {
 844         // Roughly estimate length of entry (by counting characters)
 845         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
 846         // Description: 836 characters gives roughly 342 pixel height.
 847         // This is not perfect, but it's usually OK.
 848         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
 849         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
 850         // Then put in column which is the less filled:
 851         $smallest=min($fill); // find smallest value in array.
 852         $index=array_search($smallest,$fill); // find index of this smallest value.
 853         array_push($columns[$index],$link); // Put entry in this column.
 854         $fill[$index]+=$length;
 855     }
 856
 857     $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 858     $data = array(
 859         'linksToDisplay' => $linksToDisplay,
 860         'linkcount' => count($LINKSDB),
 861         'cols' => $columns,
 862         'day' => $dayDate->getTimestamp(),
 863         'previousday' => $previousday,
 864         'nextday' => $nextday,
 865     );
 866     $pluginManager = PluginManager::getInstance();
 867     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
 868
 869     foreach ($data as $key => $value) {
 870         $pageBuilder->assign($key, $value);
 871     }
 872
 873     $pageBuilder->renderPage('daily');
 874     exit;
 875 }
 876
 877 // Renders the linklist
 878 function showLinkList($PAGE, $LINKSDB) {
 879     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
 880     $PAGE->renderPage('linklist');
 881 }
 882
 883
 884 // ------------------------------------------------------------------------------------------
 885 // Render HTML page (according to URL parameters and user rights)
 886 function renderPage()
 887 {
 888     $LINKSDB = new LinkDB(
 889         $GLOBALS['config']['DATASTORE'],
 890         isLoggedIn(),
 891         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 892         $GLOBALS['redirector'],
 893         $GLOBALS['config']['REDIRECTOR_URLENCODE']
 894     );
 895
 896     $updater = new Updater(
 897         read_updates_file($GLOBALS['config']['UPDATES_FILE']),
 898         $GLOBALS,
 899         $LINKSDB,
 900         isLoggedIn()
 901     );
 902     try {
 903         $newUpdates = $updater->update();
 904         if (! empty($newUpdates)) {
 905             write_updates_file(
 906                 $GLOBALS['config']['UPDATES_FILE'],
 907                 $updater->getDoneUpdates()
 908             );
 909         }
 910     }
 911     catch(Exception $e) {
 912         die($e->getMessage());
 913     }
 914
 915     $PAGE = new pageBuilder;
 916
 917     // Determine which page will be rendered.
 918     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
 919     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
 920
 921     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
 922     // Then assign generated data to RainTPL.
 923     $common_hooks = array(
 924         'includes',
 925         'header',
 926         'footer',
 927     );
 928     $pluginManager = PluginManager::getInstance();
 929     foreach($common_hooks as $name) {
 930         $plugin_data = array();
 931         $pluginManager->executeHooks('render_' . $name, $plugin_data,
 932             array(
 933                 'target' => $targetPage,
 934                 'loggedin' => isLoggedIn()
 935             )
 936         );
 937         $PAGE->assign('plugins_' . $name, $plugin_data);
 938     }
 939
 940     // -------- Display login form.
 941     if ($targetPage == Router::$PAGE_LOGIN)
 942     {
 943         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
 944         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
 945         $PAGE->assign('token',$token);
 946         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
 947         $PAGE->renderPage('loginform');
 948         exit;
 949     }
 950     // -------- User wants to logout.
 951     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
 952     {
 953         invalidateCaches($GLOBALS['config']['PAGECACHE']);
 954         logout();
 955         header('Location: ?');
 956         exit;
 957     }
 958
 959     // -------- Picture wall
 960     if ($targetPage == Router::$PAGE_PICWALL)
 961     {
 962         // Optionally filter the results:
 963         $links = $LINKSDB->filterSearch($_GET);
 964         $linksToDisplay = array();
 965
 966         // Get only links which have a thumbnail.
 967         foreach($links as $link)
 968         {
 969             $permalink='?'.escape(smallhash($link['linkdate']));
 970             $thumb=lazyThumbnail($link['url'],$permalink);
 971             if ($thumb!='') // Only output links which have a thumbnail.
 972             {
 973                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
 974                 $linksToDisplay[]=$link; // Add to array.
 975             }
 976         }
 977
 978         $data = array(
 979             'linkcount' => count($LINKSDB),
 980             'linksToDisplay' => $linksToDisplay,
 981         );
 982         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
 983
 984         foreach ($data as $key => $value) {
 985             $PAGE->assign($key, $value);
 986         }
 987
 988         $PAGE->renderPage('picwall');
 989         exit;
 990     }
 991
 992     // -------- Tag cloud
 993     if ($targetPage == Router::$PAGE_TAGCLOUD)
 994     {
 995         $tags= $LINKSDB->allTags();
 996
 997         // We sort tags alphabetically, then choose a font size according to count.
 998         // First, find max value.
 999         $maxcount = 0;
1000         foreach ($tags as $value) {
1001             $maxcount = max($maxcount, $value);
1002         }
1003
1004         // Sort tags alphabetically: case insensitive, support locale if avalaible.
1005         uksort($tags, function($a, $b) {
1006             // Collator is part of PHP intl.
1007             if (class_exists('Collator')) {
1008                 $c = new Collator(setlocale(LC_COLLATE, 0));
1009                 if (!intl_is_failure(intl_get_error_code())) {
1010                     return $c->compare($a, $b);
1011                 }
1012             }
1013             return strcasecmp($a, $b);
1014         });
1015
1016         $tagList = array();
1017         foreach($tags as $key => $value) {
1018             // Tag font size scaling:
1019             //   default 15 and 30 logarithm bases affect scaling,
1020             //   22 and 6 are arbitrary font sizes for max and min sizes.
1021             $size = log($value, 15) / log($maxcount, 30) * 2.2 + 0.8;
1022             $tagList[$key] = array(
1023                 'count' => $value,
1024                 'size' => number_format($size, 2, '.', ''),
1025             );
1026         }
1027
1028         $data = array(
1029             'linkcount' => count($LINKSDB),
1030             'tags' => $tagList,
1031         );
1032         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
1033
1034         foreach ($data as $key => $value) {
1035             $PAGE->assign($key, $value);
1036         }
1037
1038         $PAGE->renderPage('tagcloud');
1039         exit;
1040     }
1041
1042     // Daily page.
1043     if ($targetPage == Router::$PAGE_DAILY) {
1044         showDaily($PAGE, $LINKSDB);
1045     }
1046
1047     // ATOM and RSS feed.
1048     if ($targetPage == Router::$PAGE_FEED_ATOM || $targetPage == Router::$PAGE_FEED_RSS) {
1049         $feedType = $targetPage == Router::$PAGE_FEED_RSS ? FeedBuilder::$FEED_RSS : FeedBuilder::$FEED_ATOM;
1050         header('Content-Type: application/'. $feedType .'+xml; charset=utf-8');
1051
1052         // Cache system
1053         $query = $_SERVER['QUERY_STRING'];
1054         $cache = new CachedPage(
1055             $GLOBALS['config']['PAGECACHE'],
1056             page_url($_SERVER),
1057             startsWith($query,'do='. $targetPage) && !isLoggedIn()
1058         );
1059         $cached = $cache->cachedVersion();
1060         if (!empty($cached)) {
1061             echo $cached;
1062             exit;
1063         }
1064
1065         // Generate data.
1066         $feedGenerator = new FeedBuilder($LINKSDB, $feedType, $_SERVER, $_GET, isLoggedIn());
1067         $feedGenerator->setLocale(strtolower(setlocale(LC_COLLATE, 0)));
1068         $feedGenerator->setHideDates($GLOBALS['config']['HIDE_TIMESTAMPS'] && !isLoggedIn());
1069         $feedGenerator->setUsePermalinks(isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS']);
1070         if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) {
1071             $feedGenerator->setPubsubhubUrl($GLOBALS['config']['PUBSUBHUB_URL']);
1072         }
1073         $data = $feedGenerator->buildData();
1074
1075         // Process plugin hook.
1076         $pluginManager = PluginManager::getInstance();
1077         $pluginManager->executeHooks('render_feed', $data, array(
1078             'loggedin' => isLoggedIn(),
1079             'target' => $targetPage,
1080         ));
1081
1082         // Render the template.
1083         $PAGE->assignAll($data);
1084         $PAGE->renderPage('feed.'. $feedType);
1085         $cache->cache(ob_get_contents());
1086         ob_end_flush();
1087         exit;
1088     }
1089
1090     // Display openseach plugin (XML)
1091     if ($targetPage == Router::$PAGE_OPENSEARCH) {
1092         header('Content-Type: application/xml; charset=utf-8');
1093         $PAGE->assign('serverurl', index_url($_SERVER));
1094         $PAGE->renderPage('opensearch');
1095         exit;
1096     }
1097
1098     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1099     if (isset($_GET['addtag']))
1100     {
1101         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1102         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1103         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1104
1105         // Prevent redirection loop
1106         if (isset($params['addtag'])) {
1107             unset($params['addtag']);
1108         }
1109
1110         // Check if this tag is already in the search query and ignore it if it is.
1111         // Each tag is always separated by a space
1112         if (isset($params['searchtags'])) {
1113             $current_tags = explode(' ', $params['searchtags']);
1114         } else {
1115             $current_tags = array();
1116         }
1117         $addtag = true;
1118         foreach ($current_tags as $value) {
1119             if ($value === $_GET['addtag']) {
1120                 $addtag = false;
1121                 break;
1122             }
1123         }
1124         // Append the tag if necessary
1125         if (empty($params['searchtags'])) {
1126             $params['searchtags'] = trim($_GET['addtag']);
1127         }
1128         else if ($addtag) {
1129             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1130         }
1131
1132         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1133         header('Location: ?'.http_build_query($params));
1134         exit;
1135     }
1136
1137     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1138     if (isset($_GET['removetag'])) {
1139         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1140         if (empty($_SERVER['HTTP_REFERER'])) {
1141             header('Location: ?');
1142             exit;
1143         }
1144
1145         // In case browser does not send HTTP_REFERER
1146         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1147
1148         // Prevent redirection loop
1149         if (isset($params['removetag'])) {
1150             unset($params['removetag']);
1151         }
1152
1153         if (isset($params['searchtags'])) {
1154             $tags = explode(' ', $params['searchtags']);
1155             // Remove value from array $tags.
1156             $tags = array_diff($tags, array($_GET['removetag']));
1157             $params['searchtags'] = implode(' ',$tags);
1158
1159             if (empty($params['searchtags'])) {
1160                 unset($params['searchtags']);
1161             }
1162
1163             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1164         }
1165         header('Location: ?'.http_build_query($params));
1166         exit;
1167     }
1168
1169     // -------- User wants to change the number of links per page (linksperpage=...)
1170     if (isset($_GET['linksperpage'])) {
1171         if (is_numeric($_GET['linksperpage'])) {
1172             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1173         }
1174
1175         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1176         exit;
1177     }
1178
1179     // -------- User wants to see only private links (toggle)
1180     if (isset($_GET['privateonly'])) {
1181         if (empty($_SESSION['privateonly'])) {
1182             $_SESSION['privateonly'] = 1; // See only private links
1183         } else {
1184             unset($_SESSION['privateonly']); // See all links
1185         }
1186
1187         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1188         exit;
1189     }
1190
1191     // -------- Handle other actions allowed for non-logged in users:
1192     if (!isLoggedIn())
1193     {
1194         // User tries to post new link but is not logged in:
1195         // Show login screen, then redirect to ?post=...
1196         if (isset($_GET['post']))
1197         {
1198             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1199             exit;
1200         }
1201
1202         showLinkList($PAGE, $LINKSDB);
1203         if (isset($_GET['edit_link'])) {
1204             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1205             exit;
1206         }
1207
1208         exit; // Never remove this one! All operations below are reserved for logged in user.
1209     }
1210
1211     // -------- All other functions are reserved for the registered user:
1212
1213     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1214     if ($targetPage == Router::$PAGE_TOOLS)
1215     {
1216         $data = array(
1217             'linkcount' => count($LINKSDB),
1218             'pageabsaddr' => index_url($_SERVER),
1219         );
1220         $pluginManager->executeHooks('render_tools', $data);
1221
1222         foreach ($data as $key => $value) {
1223             $PAGE->assign($key, $value);
1224         }
1225
1226         $PAGE->renderPage('tools');
1227         exit;
1228     }
1229
1230     // -------- User wants to change his/her password.
1231     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1232     {
1233         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1234         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1235         {
1236             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1237
1238             // Make sure old password is correct.
1239             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1240             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1241             // Save new password
1242             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1243             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1244             try {
1245                 writeConfig($GLOBALS, isLoggedIn());
1246             }
1247             catch(Exception $e) {
1248                 error_log(
1249                     'ERROR while writing config file after changing password.' . PHP_EOL .
1250                     $e->getMessage()
1251                 );
1252
1253                 // TODO: do not handle exceptions/errors in JS.
1254                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1255                 exit;
1256             }
1257             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1258             exit;
1259         }
1260         else // show the change password form.
1261         {
1262             $PAGE->assign('linkcount',count($LINKSDB));
1263             $PAGE->assign('token',getToken());
1264             $PAGE->renderPage('changepassword');
1265             exit;
1266         }
1267     }
1268
1269     // -------- User wants to change configuration
1270     if ($targetPage == Router::$PAGE_CONFIGURE)
1271     {
1272         if (!empty($_POST['title']) )
1273         {
1274             if (!tokenOk($_POST['token'])) {
1275                 die('Wrong token.'); // Go away!
1276             }
1277             $tz = 'UTC';
1278             if (!empty($_POST['continent']) && !empty($_POST['city'])
1279                 && isTimeZoneValid($_POST['continent'], $_POST['city'])
1280             ) {
1281                 $tz = $_POST['continent'] . '/' . $_POST['city'];
1282             }
1283             $GLOBALS['timezone'] = $tz;
1284             $GLOBALS['title']=$_POST['title'];
1285             $GLOBALS['titleLink']=$_POST['titleLink'];
1286             $GLOBALS['redirector']=$_POST['redirector'];
1287             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1288             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1289             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1290             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1291             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1292             try {
1293                 writeConfig($GLOBALS, isLoggedIn());
1294             }
1295             catch(Exception $e) {
1296                 error_log(
1297                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1298                     $e->getMessage()
1299                 );
1300
1301                 // TODO: do not handle exceptions/errors in JS.
1302                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1303                 exit;
1304             }
1305             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1306             exit;
1307         }
1308         else // Show the configuration form.
1309         {
1310             $PAGE->assign('linkcount',count($LINKSDB));
1311             $PAGE->assign('token',getToken());
1312             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1313             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1314             list($timezone_form, $timezone_js) = generateTimeZoneForm($GLOBALS['timezone']);
1315             $PAGE->assign('timezone_form', $timezone_form);
1316             $PAGE->assign('timezone_js',$timezone_js);
1317             $PAGE->renderPage('configure');
1318             exit;
1319         }
1320     }
1321
1322     // -------- User wants to rename a tag or delete it
1323     if ($targetPage == Router::$PAGE_CHANGETAG)
1324     {
1325         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1326             $PAGE->assign('linkcount', count($LINKSDB));
1327             $PAGE->assign('token', getToken());
1328             $PAGE->assign('tags', $LINKSDB->allTags());
1329             $PAGE->renderPage('changetag');
1330             exit;
1331         }
1332
1333         if (!tokenOk($_POST['token'])) {
1334             die('Wrong token.');
1335         }
1336
1337         // Delete a tag:
1338         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1339             $needle = trim($_POST['fromtag']);
1340             // True for case-sensitive tag search.
1341             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1342             foreach($linksToAlter as $key=>$value)
1343             {
1344                 $tags = explode(' ',trim($value['tags']));
1345                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1346                 $value['tags']=trim(implode(' ',$tags));
1347                 $LINKSDB[$key]=$value;
1348             }
1349             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1350             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1351             exit;
1352         }
1353
1354         // Rename a tag:
1355         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1356             $needle = trim($_POST['fromtag']);
1357             // True for case-sensitive tag search.
1358             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1359             foreach($linksToAlter as $key=>$value)
1360             {
1361                 $tags = explode(' ',trim($value['tags']));
1362                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1363                 $value['tags']=trim(implode(' ',$tags));
1364                 $LINKSDB[$key]=$value;
1365             }
1366             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1367             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1368             exit;
1369         }
1370     }
1371
1372     // -------- User wants to add a link without using the bookmarklet: Show form.
1373     if ($targetPage == Router::$PAGE_ADDLINK)
1374     {
1375         $PAGE->assign('linkcount',count($LINKSDB));
1376         $PAGE->renderPage('addlink');
1377         exit;
1378     }
1379
1380     // -------- User clicked the "Save" button when editing a link: Save link to database.
1381     if (isset($_POST['save_edit']))
1382     {
1383         // Go away!
1384         if (! tokenOk($_POST['token'])) {
1385             die('Wrong token.');
1386         }
1387         // Remove multiple spaces.
1388         $tags = trim(preg_replace('/\s\s+/', ' ', $_POST['lf_tags']));
1389         // Remove first '-' char in tags.
1390         $tags = preg_replace('/(^| )\-/', '$1', $tags);
1391         // Remove duplicates.
1392         $tags = implode(' ', array_unique(explode(' ', $tags)));
1393         $linkdate = $_POST['lf_linkdate'];
1394         $url = trim($_POST['lf_url']);
1395         if (! startsWith($url, 'http:') && ! startsWith($url, 'https:')
1396             && ! startsWith($url, 'ftp:') && ! startsWith($url, 'magnet:')
1397             && ! startsWith($url, '?') && ! startsWith($url, 'javascript:')
1398         ) {
1399             $url = 'http://' . $url;
1400         }
1401
1402         $link = array(
1403             'title' => trim($_POST['lf_title']),
1404             'url' => $url,
1405             'description' => $_POST['lf_description'],
1406             'private' => (isset($_POST['lf_private']) ? 1 : 0),
1407             'linkdate' => $linkdate,
1408             'tags' => str_replace(',', ' ', $tags)
1409         );
1410         // If title is empty, use the URL as title.
1411         if ($link['title'] == '') {
1412             $link['title'] = $link['url'];
1413         }
1414
1415         $pluginManager->executeHooks('save_link', $link);
1416
1417         $LINKSDB[$linkdate] = $link;
1418         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1419         pubsubhub();
1420
1421         // If we are called from the bookmarklet, we must close the popup:
1422         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1423             echo '<script>self.close();</script>';
1424             exit;
1425         }
1426
1427         $returnurl = !empty($_POST['returnurl']) ? $_POST['returnurl'] : '?';
1428         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1429         // Scroll to the link which has been edited.
1430         $location .= '#' . smallHash($_POST['lf_linkdate']);
1431         // After saving the link, redirect to the page the user was on.
1432         header('Location: '. $location);
1433         exit;
1434     }
1435
1436     // -------- User clicked the "Cancel" button when editing a link.
1437     if (isset($_POST['cancel_edit']))
1438     {
1439         // If we are called from the bookmarklet, we must close the popup:
1440         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1441         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1442         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1443         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1444         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1445         exit;
1446     }
1447
1448     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1449     if (isset($_POST['delete_link']))
1450     {
1451         if (!tokenOk($_POST['token'])) die('Wrong token.');
1452         // We do not need to ask for confirmation:
1453         // - confirmation is handled by JavaScript
1454         // - we are protected from XSRF by the token.
1455         $linkdate=$_POST['lf_linkdate'];
1456
1457         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1458
1459         unset($LINKSDB[$linkdate]);
1460         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // save to disk
1461
1462         // If we are called from the bookmarklet, we must close the popup:
1463         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1464         // Pick where we're going to redirect
1465         // =============================================================
1466         // Basically, we can't redirect to where we were previously if it was a permalink
1467         // or an edit_link, because it would 404.
1468         // Cases:
1469         //    - /             : nothing in $_GET, redirect to self
1470         //    - /?page        : redirect to self
1471         //    - /?searchterm  : redirect to self (there might be other links)
1472         //    - /?searchtags  : redirect to self
1473         //    - /permalink    : redirect to / (the link does not exist anymore)
1474         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1475         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1476         // redirect is not satisfied, and only then redirect to /
1477         $location = "?";
1478         // Self redirection
1479         if (count($_GET) == 0
1480             || isset($_GET['page'])
1481             || isset($_GET['searchterm'])
1482             || isset($_GET['searchtags'])
1483         ) {
1484             if (isset($_POST['returnurl'])) {
1485                 $location = $_POST['returnurl']; // Handle redirects given by the form
1486             } else {
1487                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1488             }
1489         }
1490
1491         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1492         exit;
1493     }
1494
1495     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1496     if (isset($_GET['edit_link']))
1497     {
1498         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1499         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1500         $data = array(
1501             'linkcount' => count($LINKSDB),
1502             'link' => $link,
1503             'link_is_new' => false,
1504             'token' => getToken(),
1505             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1506             'tags' => $LINKSDB->allTags(),
1507         );
1508         $pluginManager->executeHooks('render_editlink', $data);
1509
1510         foreach ($data as $key => $value) {
1511             $PAGE->assign($key, $value);
1512         }
1513
1514         $PAGE->renderPage('editlink');
1515         exit;
1516     }
1517
1518     // -------- User want to post a new link: Display link edit form.
1519     if (isset($_GET['post'])) {
1520         $url = cleanup_url($_GET['post']);
1521
1522         $link_is_new = false;
1523         // Check if URL is not already in database (in this case, we will edit the existing link)
1524         $link = $LINKSDB->getLinkFromUrl($url);
1525         if (!$link)
1526         {
1527             $link_is_new = true;
1528             $linkdate = strval(date('Ymd_His'));
1529             // Get title if it was provided in URL (by the bookmarklet).
1530             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1531             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1532             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1533             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1534             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1535             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1536             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1537                 // Short timeout to keep the application responsive
1538                 list($headers, $content) = get_http_response($url, 4);
1539                 if (strpos($headers[0], '200 OK') !== false) {
1540                     // Retrieve charset.
1541                     $charset = get_charset($headers, $content);
1542                     // Extract title.
1543                     $title = html_extract_title($content);
1544                     // Re-encode title in utf-8 if necessary.
1545                     if (! empty($title) && strtolower($charset) != 'utf-8') {
1546                         $title = mb_convert_encoding($title, 'utf-8', $charset);
1547                     }
1548                 }
1549             }
1550
1551             if ($url == '') {
1552                 $url = '?' . smallHash($linkdate);
1553                 $title = 'Note: ';
1554             }
1555             $url = escape($url);
1556             $title = escape($title);
1557
1558             $link = array(
1559                 'linkdate' => $linkdate,
1560                 'title' => $title,
1561                 'url' => $url,
1562                 'description' => $description,
1563                 'tags' => $tags,
1564                 'private' => $private
1565             );
1566         }
1567
1568         $data = array(
1569             'linkcount' => count($LINKSDB),
1570             'link' => $link,
1571             'link_is_new' => $link_is_new,
1572             'token' => getToken(), // XSRF protection.
1573             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1574             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1575             'tags' => $LINKSDB->allTags(),
1576         );
1577         $pluginManager->executeHooks('render_editlink', $data);
1578
1579         foreach ($data as $key => $value) {
1580             $PAGE->assign($key, $value);
1581         }
1582
1583         $PAGE->renderPage('editlink');
1584         exit;
1585     }
1586
1587     if ($targetPage == Router::$PAGE_EXPORT) {
1588         // Export links as a Netscape Bookmarks file
1589
1590         if (empty($_GET['selection'])) {
1591             $PAGE->assign('linkcount',count($LINKSDB));
1592             $PAGE->renderPage('export');
1593             exit;
1594         }
1595
1596         // export as bookmarks_(all|private|public)_YYYYmmdd_HHMMSS.html
1597         $selection = $_GET['selection'];
1598         if (isset($_GET['prepend_note_url'])) {
1599             $prependNoteUrl = $_GET['prepend_note_url'];
1600         } else {
1601             $prependNoteUrl = false;
1602         }
1603
1604         try {
1605             $PAGE->assign(
1606                 'links',
1607                 NetscapeBookmarkUtils::filterAndFormat(
1608                     $LINKSDB,
1609                     $selection,
1610                     $prependNoteUrl,
1611                     index_url($_SERVER)
1612                 )
1613             );
1614         } catch (Exception $exc) {
1615             header('Content-Type: text/plain; charset=utf-8');
1616             echo $exc->getMessage();
1617             exit;
1618         }
1619         $now = new DateTime();
1620         header('Content-Type: text/html; charset=utf-8');
1621         header(
1622             'Content-disposition: attachment; filename=bookmarks_'
1623            .$selection.'_'.$now->format(LinkDB::LINK_DATE_FORMAT).'.html'
1624         );
1625         $PAGE->assign('date', $now->format(DateTime::RFC822));
1626         $PAGE->assign('eol', PHP_EOL);
1627         $PAGE->assign('selection', $selection);
1628         $PAGE->renderPage('export.bookmarks');
1629         exit;
1630     }
1631
1632     // -------- User is uploading a file for import
1633     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1634     {
1635         // If file is too big, some form field may be missing.
1636         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1637         {
1638             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1639             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1640             exit;
1641         }
1642         if (!tokenOk($_POST['token'])) die('Wrong token.');
1643         importFile($LINKSDB);
1644         exit;
1645     }
1646
1647     // -------- Show upload/import dialog:
1648     if ($targetPage == Router::$PAGE_IMPORT)
1649     {
1650         $PAGE->assign('linkcount',count($LINKSDB));
1651         $PAGE->assign('token',getToken());
1652         $PAGE->assign('maxfilesize',getMaxFileSize());
1653         $PAGE->renderPage('import');
1654         exit;
1655     }
1656
1657     // Plugin administration page
1658     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1659         $pluginMeta = $pluginManager->getPluginsMeta();
1660
1661         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1662         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1663         // Load parameters.
1664         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $GLOBALS['plugins']);
1665         uasort(
1666             $enabledPlugins,
1667             function($a, $b) { return $a['order'] - $b['order']; }
1668         );
1669         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1670
1671         $PAGE->assign('enabledPlugins', $enabledPlugins);
1672         $PAGE->assign('disabledPlugins', $disabledPlugins);
1673         $PAGE->renderPage('pluginsadmin');
1674         exit;
1675     }
1676
1677     // Plugin administration form action
1678     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1679         try {
1680             if (isset($_POST['parameters_form'])) {
1681                 unset($_POST['parameters_form']);
1682                 foreach ($_POST as $param => $value) {
1683                     $GLOBALS['plugins'][$param] = escape($value);
1684                 }
1685             }
1686             else {
1687                 $GLOBALS['config']['ENABLED_PLUGINS'] = save_plugin_config($_POST);
1688             }
1689             writeConfig($GLOBALS, isLoggedIn());
1690         }
1691         catch (Exception $e) {
1692             error_log(
1693                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1694                 $e->getMessage()
1695             );
1696
1697             // TODO: do not handle exceptions/errors in JS.
1698             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do='. Router::$PAGE_PLUGINSADMIN .'\';</script>';
1699             exit;
1700         }
1701         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1702         exit;
1703     }
1704
1705     // -------- Otherwise, simply display search form and links:
1706     showLinkList($PAGE, $LINKSDB);
1707     exit;
1708 }
1709
1710 // -----------------------------------------------------------------------------------------------
1711 // Process the import file form.
1712 function importFile($LINKSDB)
1713 {
1714     if (!isLoggedIn()) { die('Not allowed.'); }
1715
1716     $filename=$_FILES['filetoupload']['name'];
1717     $filesize=$_FILES['filetoupload']['size'];
1718     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1719     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1720     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1721     $import_count=0;
1722
1723     // Sniff file type:
1724     $type='unknown';
1725     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1726
1727     // Then import the bookmarks.
1728     if ($type=='netscape')
1729     {
1730         // This is a standard Netscape-style bookmark file.
1731         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1732         foreach(explode('<DT>',$data) as $html) // explode is very fast
1733         {
1734             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1735             $d = explode('<DD>',$html);
1736             if (startswith($d[0],'<A '))
1737             {
1738                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1739                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1740                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1741                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1742                 $raw_add_date=0;
1743                 foreach($matches as $m)
1744                 {
1745                     $attr=$m[1]; $value=$m[2];
1746                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1747                     elseif ($attr=='ADD_DATE')
1748                     {
1749                         $raw_add_date=intval($value);
1750                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1751                     }
1752                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1753                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1754                 }
1755                 if ($link['url']!='')
1756                 {
1757                     if ($private==1) $link['private']=1;
1758                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1759                     if ($dblink==false)
1760                     {  // Link not in database, let's import it...
1761                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1762
1763                        // Make sure date/time is not already used by another link.
1764                        // (Some bookmark files have several different links with the same ADD_DATE)
1765                        // We increment date by 1 second until we find a date which is not used in DB.
1766                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1767                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1768                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1769                        $LINKSDB[$link['linkdate']] = $link;
1770                        $import_count++;
1771                     }
1772                     else // Link already present in database.
1773                     {
1774                         if ($overwrite)
1775                         {   // If overwrite is required, we import link data, except date/time.
1776                             $link['linkdate']=$dblink['linkdate'];
1777                             $LINKSDB[$link['linkdate']] = $link;
1778                             $import_count++;
1779                         }
1780                     }
1781
1782                 }
1783             }
1784         }
1785         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1786
1787         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1788     }
1789     else
1790     {
1791         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1792     }
1793 }
1794
1795 /**
1796  * Template for the list of links (<div id="linklist">)
1797  * This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1798  *
1799  * @param pageBuilder $PAGE    pageBuilder instance.
1800  * @param LinkDB      $LINKSDB LinkDB instance.
1801  */
1802 function buildLinkList($PAGE,$LINKSDB)
1803 {
1804     // Used in templates
1805     $searchtags = !empty($_GET['searchtags']) ? escape($_GET['searchtags']) : '';
1806     $searchterm = !empty($_GET['searchterm']) ? escape($_GET['searchterm']) : '';
1807
1808     // Smallhash filter
1809     if (! empty($_SERVER['QUERY_STRING'])
1810         && preg_match('/^[a-zA-Z0-9-_@]{6}($|&|#)/', $_SERVER['QUERY_STRING'])) {
1811         try {
1812             $linksToDisplay = $LINKSDB->filterHash($_SERVER['QUERY_STRING']);
1813         } catch (LinkNotFoundException $e) {
1814             $PAGE->render404($e->getMessage());
1815             exit;
1816         }
1817     } else {
1818         // Filter links according search parameters.
1819         $privateonly = !empty($_SESSION['privateonly']);
1820         $linksToDisplay = $LINKSDB->filterSearch($_GET, false, $privateonly);
1821     }
1822
1823     // ---- Handle paging.
1824     $keys = array();
1825     foreach ($linksToDisplay as $key => $value) {
1826         $keys[] = $key;
1827     }
1828
1829     // If there is only a single link, we change on-the-fly the title of the page.
1830     if (count($linksToDisplay) == 1) {
1831         $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1832     }
1833
1834     // Select articles according to paging.
1835     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1836     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1837     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1838     $page = $page < 1 ? 1 : $page;
1839     $page = $page > $pagecount ? $pagecount : $page;
1840     // Start index.
1841     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1842     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1843     $linkDisp = array();
1844     while ($i<$end && $i<count($keys))
1845     {
1846         $link = $linksToDisplay[$keys[$i]];
1847         $link['description'] = format_description($link['description'], $GLOBALS['redirector']);
1848         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
1849         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
1850         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
1851         $link['timestamp'] = $date->getTimestamp();
1852         $taglist = explode(' ', $link['tags']);
1853         uasort($taglist, 'strcasecmp');
1854         $link['taglist'] = $taglist;
1855         $link['shorturl'] = smallHash($link['linkdate']);
1856         // Check for both signs of a note: starting with ? and 7 chars long.
1857         if ($link['url'][0] === '?' &&
1858             strlen($link['url']) === 7) {
1859             $link['url'] = index_url($_SERVER) . $link['url'];
1860         }
1861
1862         $linkDisp[$keys[$i]] = $link;
1863         $i++;
1864     }
1865
1866     // Compute paging navigation
1867     $searchtagsUrl = empty($searchtags) ? '' : '&searchtags=' . urlencode($searchtags);
1868     $searchtermUrl = empty($searchterm) ? '' : '&searchterm=' . urlencode($searchterm);
1869     $previous_page_url = '';
1870     if ($i != count($keys)) {
1871         $previous_page_url = '?page=' . ($page+1) . $searchtermUrl . $searchtagsUrl;
1872     }
1873     $next_page_url='';
1874     if ($page>1) {
1875         $next_page_url = '?page=' . ($page-1) . $searchtermUrl . $searchtagsUrl;
1876     }
1877
1878     $token = isLoggedIn() ? getToken() : '';
1879
1880     // Fill all template fields.
1881     $data = array(
1882         'linkcount' => count($LINKSDB),
1883         'previous_page_url' => $previous_page_url,
1884         'next_page_url' => $next_page_url,
1885         'page_current' => $page,
1886         'page_max' => $pagecount,
1887         'result_count' => count($linksToDisplay),
1888         'search_term' => $searchterm,
1889         'search_tags' => $searchtags,
1890         'redirector' => empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'],  // Optional redirector URL.
1891         'token' => $token,
1892         'links' => $linkDisp,
1893         'tags' => $LINKSDB->allTags(),
1894     );
1895     // FIXME! temporary fix - see #399.
1896     if (!empty($GLOBALS['pagetitle']) && count($linkDisp) == 1) {
1897         $data['pagetitle'] = $GLOBALS['pagetitle'];
1898     }
1899
1900     $pluginManager = PluginManager::getInstance();
1901     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
1902
1903     foreach ($data as $key => $value) {
1904         $PAGE->assign($key, $value);
1905     }
1906
1907     return;
1908 }
1909
1910 // Compute the thumbnail for a link.
1911 //
1912 // With a link to the original URL.
1913 // Understands various services (youtube.com...)
1914 // Input: $url = URL for which the thumbnail must be found.
1915 //        $href = if provided, this URL will be followed instead of $url
1916 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1917 // Some of them may be missing.
1918 // Return an empty array if no thumbnail available.
1919 function computeThumbnail($url,$href=false)
1920 {
1921     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
1922     if ($href==false) $href=$url;
1923
1924     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1925     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1926     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1927     $domain = parse_url($url,PHP_URL_HOST);
1928     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1929     {
1930         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1931         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1932                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1933     }
1934     if ($domain=='youtu.be') // Youtube short links
1935     {
1936         $path = parse_url($url,PHP_URL_PATH);
1937         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1938                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1939     }
1940     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1941     {
1942         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1943         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1944                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1945     }
1946
1947     if ($domain=='imgur.com')
1948     {
1949         $path = parse_url($url,PHP_URL_PATH);
1950         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1951         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1952                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1953         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1954                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1955
1956         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1957                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1958     }
1959     if ($domain=='i.imgur.com')
1960     {
1961         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1962         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1963                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1964     }
1965     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1966     {
1967         if (strpos($url,'dailymotion.com/video/')!==false)
1968         {
1969             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1970             return array('src'=>$thumburl,
1971                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1972         }
1973     }
1974     if (endsWith($domain,'.imageshack.us'))
1975     {
1976         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1977         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1978         {
1979             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1980             return array('src'=>$thumburl,
1981                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1982         }
1983     }
1984
1985     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1986     // So we deport the thumbnail generation in order not to slow down page generation
1987     // (and we also cache the thumbnail)
1988
1989     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1990
1991     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1992         || $domain=='vimeo.com'
1993         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1994         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1995     )
1996     {
1997         if ($domain=='vimeo.com')
1998         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1999             $path = parse_url($url,PHP_URL_PATH);
2000             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
2001         }
2002         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2003         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
2004             $path = parse_url($url,PHP_URL_PATH);
2005             if (!preg_match('!/\d+.+?!',$path)) return array();
2006         }
2007         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2008         {   // Make sure this TED URL points to a video (/talks/...)
2009             $path = parse_url($url,PHP_URL_PATH);
2010             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
2011         }
2012         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2013         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2014                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2015     }
2016
2017     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
2018     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
2019     // But using the extension will do.
2020     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2021     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2022     {
2023         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2024         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2025                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2026     }
2027     return array(); // No thumbnail.
2028
2029 }
2030
2031
2032 // Returns the HTML code to display a thumbnail for a link
2033 // with a link to the original URL.
2034 // Understands various services (youtube.com...)
2035 // Input: $url = URL for which the thumbnail must be found.
2036 //        $href = if provided, this URL will be followed instead of $url
2037 // Returns '' if no thumbnail available.
2038 function thumbnail($url,$href=false)
2039 {
2040     $t = computeThumbnail($url,$href);
2041     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2042
2043     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
2044     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2045     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2046     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2047     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2048     $html.='></a>';
2049     return $html;
2050 }
2051
2052 // Returns the HTML code to display a thumbnail for a link
2053 // for the picture wall (using lazy image loading)
2054 // Understands various services (youtube.com...)
2055 // Input: $url = URL for which the thumbnail must be found.
2056 //        $href = if provided, this URL will be followed instead of $url
2057 // Returns '' if no thumbnail available.
2058 function lazyThumbnail($url,$href=false)
2059 {
2060     $t = computeThumbnail($url,$href);
2061     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2062
2063     $html='<a href="'.escape($t['href']).'">';
2064
2065     // Lazy image
2066     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
2067
2068     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2069     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2070     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2071     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2072     $html.='>';
2073
2074     // No-JavaScript fallback.
2075     $html.='<noscript><img src="'.escape($t['src']).'"';
2076     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2077     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2078     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2079     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2080     $html.='></noscript></a>';
2081
2082     return $html;
2083 }
2084
2085
2086 // -----------------------------------------------------------------------------------------------
2087 // Installation
2088 // This function should NEVER be called if the file data/config.php exists.
2089 function install()
2090 {
2091     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2092     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2093
2094
2095     // This part makes sure sessions works correctly.
2096     // (Because on some hosts, session.save_path may not be set correctly,
2097     // or we may not have write access to it.)
2098     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2099     {   // Step 2: Check if data in session is correct.
2100         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2101         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2102         echo 'It currently points to '.session_save_path().'<br>';
2103         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2104         echo '<br><a href="?">Click to try again.</a></pre>';
2105         die;
2106     }
2107     if (!isset($_SESSION['session_tested']))
2108     {   // Step 1 : Try to store data in session and reload page.
2109         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2110         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
2111     }
2112     if (isset($_GET['test_session']))
2113     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2114         header('Location: '.index_url($_SERVER));
2115     }
2116
2117
2118     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2119     {
2120         $tz = 'UTC';
2121         if (!empty($_POST['continent']) && !empty($_POST['city'])
2122             && isTimeZoneValid($_POST['continent'], $_POST['city'])
2123         ) {
2124             $tz = $_POST['continent'].'/'.$_POST['city'];
2125         }
2126         $GLOBALS['timezone'] = $tz;
2127         // Everything is ok, let's create config file.
2128         $GLOBALS['login'] = $_POST['setlogin'];
2129         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2130         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2131         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(index_url($_SERVER)) : $_POST['title'] );
2132         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2133         try {
2134             writeConfig($GLOBALS, isLoggedIn());
2135         }
2136         catch(Exception $e) {
2137             error_log(
2138                     'ERROR while writing config file after installation.' . PHP_EOL .
2139                     $e->getMessage()
2140                 );
2141
2142             // TODO: do not handle exceptions/errors in JS.
2143             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2144             exit;
2145         }
2146         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2147         exit;
2148     }
2149
2150     // Display config form:
2151     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2152     $timezone_html = '';
2153     if ($timezone_form != '') {
2154         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2155     }
2156
2157     $PAGE = new pageBuilder;
2158     $PAGE->assign('timezone_html',$timezone_html);
2159     $PAGE->assign('timezone_js',$timezone_js);
2160     $PAGE->renderPage('install');
2161     exit;
2162 }
2163
2164 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2165    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2166    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2167    This function is called by passing the URL:
2168    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2169    [URL] is the URL of the link (e.g. a flickr page)
2170    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2171    The function below will fetch the image from the webservice and store it in the cache.
2172 */
2173 function genThumbnail()
2174 {
2175     // Make sure the parameters in the URL were generated by us.
2176     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2177     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2178
2179     // Let's see if we don't already have the image for this URL in the cache.
2180     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2181     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2182     {   // We have the thumbnail, just serve it:
2183         header('Content-Type: image/jpeg');
2184         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2185         return;
2186     }
2187     // We may also serve a blank image (if service did not respond)
2188     $blankname=hash('sha1',$_GET['url']).'.gif';
2189     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2190     {
2191         header('Content-Type: image/gif');
2192         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2193         return;
2194     }
2195
2196     // Otherwise, generate the thumbnail.
2197     $url = $_GET['url'];
2198     $domain = parse_url($url,PHP_URL_HOST);
2199
2200     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2201     {
2202         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2203         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2204
2205         // Is this a link to an image, or to a flickr page ?
2206         $imageurl='';
2207         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2208         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2209             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2210             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2211         }
2212         else // This is a flickr page (html)
2213         {
2214             // Get the flickr html page.
2215             list($headers, $content) = get_http_response($url, 20);
2216             if (strpos($headers[0], '200 OK') !== false)
2217             {
2218                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2219                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2220                 if (!empty($matches[1])) $imageurl=$matches[1];
2221
2222                 // In albums (and some other pages), the link rel="image_src" is not provided,
2223                 // but flickr provides:
2224                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2225                 if ($imageurl=='')
2226                 {
2227                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2228                     if (!empty($matches[1])) $imageurl=$matches[1];
2229                 }
2230             }
2231         }
2232
2233         if ($imageurl!='')
2234         {   // Let's download the image.
2235             // Image is 240x120, so 10 seconds to download should be enough.
2236             list($headers, $content) = get_http_response($imageurl, 10);
2237             if (strpos($headers[0], '200 OK') !== false) {
2238                 // Save image to cache.
2239                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/' . $thumbname, $content);
2240                 header('Content-Type: image/jpeg');
2241                 echo $content;
2242                 return;
2243             }
2244         }
2245     }
2246
2247     elseif ($domain=='vimeo.com' )
2248     {
2249         // This is more complex: we have to perform a HTTP request, then parse the result.
2250         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2251         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2252         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2253         if (strpos($headers[0], '200 OK') !== false) {
2254             $t = unserialize($content);
2255             $imageurl = $t[0]['thumbnail_medium'];
2256             // Then we download the image and serve it to our client.
2257             list($headers, $content) = get_http_response($imageurl, 10);
2258             if (strpos($headers[0], '200 OK') !== false) {
2259                 // Save image to cache.
2260                 file_put_contents($GLOBALS['config']['CACHEDIR'] . '/' . $thumbname, $content);
2261                 header('Content-Type: image/jpeg');
2262                 echo $content;
2263                 return;
2264             }
2265         }
2266     }
2267
2268     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2269     {
2270         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2271         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2272         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2273         list($headers, $content) = get_http_response($url, 5);
2274         if (strpos($headers[0], '200 OK') !== false) {
2275             // Extract the link to the thumbnail
2276             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2277             if (!empty($matches[1]))
2278             {   // Let's download the image.
2279                 $imageurl=$matches[1];
2280                 // No control on image size, so wait long enough
2281                 list($headers, $content) = get_http_response($imageurl, 20);
2282                 if (strpos($headers[0], '200 OK') !== false) {
2283                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2284                     file_put_contents($filepath, $content); // Save image to cache.
2285                     if (resizeImage($filepath))
2286                     {
2287                         header('Content-Type: image/jpeg');
2288                         echo file_get_contents($filepath);
2289                         return;
2290                     }
2291                 }
2292             }
2293         }
2294     }
2295
2296     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2297     {
2298         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2299         // http://xkcd.com/327/
2300         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2301         list($headers, $content) = get_http_response($url, 5);
2302         if (strpos($headers[0], '200 OK') !== false) {
2303             // Extract the link to the thumbnail
2304             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2305             if (!empty($matches[1]))
2306             {   // Let's download the image.
2307                 $imageurl=$matches[1];
2308                 // No control on image size, so wait long enough
2309                 list($headers, $content) = get_http_response($imageurl, 20);
2310                 if (strpos($headers[0], '200 OK') !== false) {
2311                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2312                     // Save image to cache.
2313                     file_put_contents($filepath, $content);
2314                     if (resizeImage($filepath))
2315                     {
2316                         header('Content-Type: image/jpeg');
2317                         echo file_get_contents($filepath);
2318                         return;
2319                     }
2320                 }
2321             }
2322         }
2323     }
2324
2325     else
2326     {
2327         // For all other domains, we try to download the image and make a thumbnail.
2328         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2329         list($headers, $content) = get_http_response($url, 30);
2330         if (strpos($headers[0], '200 OK') !== false) {
2331             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2332             // Save image to cache.
2333             file_put_contents($filepath, $content);
2334             if (resizeImage($filepath))
2335             {
2336                 header('Content-Type: image/jpeg');
2337                 echo file_get_contents($filepath);
2338                 return;
2339             }
2340         }
2341     }
2342
2343
2344     // Otherwise, return an empty image (8x8 transparent gif)
2345     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2346     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2347     header('Content-Type: image/gif');
2348     echo $blankgif;
2349 }
2350
2351 // Make a thumbnail of the image (to width: 120 pixels)
2352 // Returns true if success, false otherwise.
2353 function resizeImage($filepath)
2354 {
2355     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2356
2357     // Trick: some stupid people rename GIF as JPEG... or else.
2358     // So we really try to open each image type whatever the extension is.
2359     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2360     $im=false;
2361     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2362     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2363     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2364     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2365     $w = imagesx($im);
2366     $h = imagesy($im);
2367     $ystart = 0; $yheight=$h;
2368     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2369     $nw = 120;   // Desired width
2370     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2371     // Resize image:
2372     $im2 = imagecreatetruecolor($nw,$nh);
2373     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2374     imageinterlace($im2,true); // For progressive JPEG.
2375     $tempname=$filepath.'_TEMP.jpg';
2376     imagejpeg($im2, $tempname, 90);
2377     imagedestroy($im);
2378     imagedestroy($im2);
2379     unlink($filepath);
2380     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2381     return true;
2382 }
2383
2384 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2385 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2386 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2387 renderPage();
2388 ?>