index.php

   1 <?php
   2 /**
   3  * Shaarli v0.7.1 - 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 $GLOBALS['config']['PUBSUBHUB_URL'] = '';
 125
 126 /*
 127  * PHP configuration
 128  */
 129 define('shaarli_version', '0.7.1');
 130
 131 // http://server.com/x/shaarli --> /shaarli/
 132 define('WEB_PATH', substr($_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/PageBuilder.php';
 166 require_once 'application/TimeZone.php';
 167 require_once 'application/Url.php';
 168 require_once 'application/Utils.php';
 169 require_once 'application/Config.php';
 170 require_once 'application/PluginManager.php';
 171 require_once 'application/Router.php';
 172 require_once 'application/Updater.php';
 173
 174 // Ensure the PHP version is supported
 175 try {
 176     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
 177 } catch(Exception $exc) {
 178     header('Content-Type: text/plain; charset=utf-8');
 179     echo $exc->getMessage();
 180     exit;
 181 }
 182
 183 // Force cookie path (but do not change lifetime)
 184 $cookie = session_get_cookie_params();
 185 $cookiedir = '';
 186 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
 187     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
 188 }
 189 // Set default cookie expiration and path.
 190 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 191 // Set session parameters on server side.
 192 // If the user does not access any page within this time, his/her session is considered expired.
 193 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 194 // Use cookies to store session.
 195 ini_set('session.use_cookies', 1);
 196 // Force cookies for session (phpsessionID forbidden in URL).
 197 ini_set('session.use_only_cookies', 1);
 198 // Prevent PHP form using sessionID in URL if cookies are disabled.
 199 ini_set('session.use_trans_sid', false);
 200
 201 session_name('shaarli');
 202 // Start session if needed (Some server auto-start sessions).
 203 if (session_id() == '') {
 204     session_start();
 205 }
 206
 207 // Regenerate session ID if invalid or not defined in cookie.
 208 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 209     session_regenerate_id(true);
 210     $_COOKIE['shaarli'] = session_id();
 211 }
 212
 213 include "inc/rain.tpl.class.php"; //include Rain TPL
 214 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
 215 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
 216
 217 $pluginManager = PluginManager::getInstance();
 218 $pluginManager->load($GLOBALS['config']['ENABLED_PLUGINS']);
 219
 220 ob_start();  // Output buffering for the page cache.
 221
 222
 223 // In case stupid admin has left magic_quotes enabled in php.ini:
 224 if (get_magic_quotes_gpc())
 225 {
 226     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 227     $_POST = array_map('stripslashes_deep', $_POST);
 228     $_GET = array_map('stripslashes_deep', $_GET);
 229     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 230 }
 231
 232 // Prevent caching on client side or proxy: (yes, it's ugly)
 233 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 234 header("Cache-Control: no-store, no-cache, must-revalidate");
 235 header("Cache-Control: post-check=0, pre-check=0", false);
 236 header("Pragma: no-cache");
 237
 238 // Handling of old config file which do not have the new parameters.
 239 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(index_url($_SERVER));
 240 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 241 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 242 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 243 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 244 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 245 // I really need to rewrite Shaarli with a proper configuation manager.
 246
 247 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 248     // Ensure Shaarli has proper access to its resources
 249     $errors = ApplicationUtils::checkResourcePermissions($GLOBALS['config']);
 250
 251     if ($errors != array()) {
 252         $message = '<p>Insufficient permissions:</p><ul>';
 253
 254         foreach ($errors as $error) {
 255             $message .= '<li>'.$error.'</li>';
 256         }
 257         $message .= '</ul>';
 258
 259         header('Content-Type: text/html; charset=utf-8');
 260         echo $message;
 261         exit;
 262     }
 263
 264     // Display the installation form if no existing config is found
 265     install();
 266 }
 267
 268 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 269 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 270 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 271
 272 // a token depending of deployment salt, user password, and the current ip
 273 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 274
 275 // Sniff browser language and set date format accordingly.
 276 if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
 277     autoLocale($_SERVER['HTTP_ACCEPT_LANGUAGE']);
 278 }
 279 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 280
 281 //==================================================================================================
 282 // Checking session state (i.e. is the user still logged in)
 283 //==================================================================================================
 284
 285 function setup_login_state() {
 286         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 287             return true;
 288         }
 289         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 290         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 291         if (!isset($GLOBALS['login'])) {
 292             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 293             $loginFailure = true;
 294         }
 295         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 296             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 297             !$loginFailure)
 298         {
 299             fillSessionInfo();
 300             $userIsLoggedIn = true;
 301         }
 302         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 303         if (empty($_SESSION['uid']) ||
 304             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 305             time() >= $_SESSION['expires_on'])
 306         {
 307             logout();
 308             $userIsLoggedIn = false;
 309             $loginFailure = true;
 310         }
 311         if (!empty($_SESSION['longlastingsession'])) {
 312             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 313         }
 314         else {
 315             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 316         }
 317         if (!$loginFailure) {
 318             $userIsLoggedIn = true;
 319         }
 320
 321         return $userIsLoggedIn;
 322 }
 323 $userIsLoggedIn = setup_login_state();
 324
 325 // ------------------------------------------------------------------------------------------
 326 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 327 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 328 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 329 function pubsubhub()
 330 {
 331     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 332     {
 333        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 334        $topic_url = array (
 335                        index_url($_SERVER).'?do=atom',
 336                        index_url($_SERVER).'?do=rss'
 337                     );
 338        $p->publish_update($topic_url);
 339     }
 340 }
 341
 342 // ------------------------------------------------------------------------------------------
 343 // Session management
 344
 345 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 346 function allIPs()
 347 {
 348     $ip = $_SERVER["REMOTE_ADDR"];
 349     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 350     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 351     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 352     return $ip;
 353 }
 354
 355 function fillSessionInfo() {
 356         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 357         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 358         $_SESSION['username']=$GLOBALS['login'];
 359         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 360 }
 361
 362 // Check that user/password is correct.
 363 function check_auth($login,$password)
 364 {
 365     $hash = sha1($password.$login.$GLOBALS['salt']);
 366     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 367     {   // Login/password is correct.
 368                 fillSessionInfo();
 369         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login successful');
 370         return True;
 371     }
 372     logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login failed for user '.$login);
 373     return False;
 374 }
 375
 376 // Returns true if the user is logged in.
 377 function isLoggedIn()
 378 {
 379     global $userIsLoggedIn;
 380     return $userIsLoggedIn;
 381 }
 382
 383 // Force logout.
 384 function logout() {
 385     if (isset($_SESSION)) {
 386         unset($_SESSION['uid']);
 387         unset($_SESSION['ip']);
 388         unset($_SESSION['username']);
 389         unset($_SESSION['privateonly']);
 390     }
 391     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 392 }
 393
 394
 395 // ------------------------------------------------------------------------------------------
 396 // Brute force protection system
 397 // Several consecutive failed logins will ban the IP address for 30 minutes.
 398 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?>");
 399 include $GLOBALS['config']['IPBANS_FILENAME'];
 400 // Signal a failed login. Will ban the IP if too many failures:
 401 function ban_loginFailed()
 402 {
 403     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 404     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 405     $gb['FAILURES'][$ip]++;
 406     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 407     {
 408         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 409         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'IP address banned from login');
 410     }
 411     $GLOBALS['IPBANS'] = $gb;
 412     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 413 }
 414
 415 // Signals a successful login. Resets failed login counter.
 416 function ban_loginOk()
 417 {
 418     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 419     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 420     $GLOBALS['IPBANS'] = $gb;
 421     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 422 }
 423
 424 // Checks if the user CAN login. If 'true', the user can try to login.
 425 function ban_canLogin()
 426 {
 427     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 428     if (isset($gb['BANS'][$ip]))
 429     {
 430         // User is banned. Check if the ban has expired:
 431         if ($gb['BANS'][$ip]<=time())
 432         {   // Ban expired, user can try to login again.
 433             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Ban lifted.');
 434             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 435             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 436             return true; // Ban has expired, user can login.
 437         }
 438         return false; // User is banned.
 439     }
 440     return true; // User is not banned.
 441 }
 442
 443 // ------------------------------------------------------------------------------------------
 444 // Process login form: Check if login/password is correct.
 445 if (isset($_POST['login']))
 446 {
 447     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 448     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 449     {   // Login/password is OK.
 450         ban_loginOk();
 451         // If user wants to keep the session cookie even after the browser closes:
 452         if (!empty($_POST['longlastingsession']))
 453         {
 454                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 455             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 456             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 457
 458             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 459             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 460             // Note: Never forget the trailing slash on the cookie path!
 461             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 462         }
 463         else // Standard session expiration (=when browser closes)
 464         {
 465             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 466             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 467             session_regenerate_id(true);
 468         }
 469
 470         // Optional redirect after login:
 471         if (isset($_GET['post'])) {
 472             $uri = '?post='. urlencode($_GET['post']);
 473             foreach (array('description', 'source', 'title') as $param) {
 474                 if (!empty($_GET[$param])) {
 475                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 476                 }
 477             }
 478             header('Location: '. $uri);
 479             exit;
 480         }
 481
 482         if (isset($_GET['edit_link'])) {
 483             header('Location: ?edit_link='. escape($_GET['edit_link']));
 484             exit;
 485         }
 486
 487         if (isset($_POST['returnurl'])) {
 488             // Prevent loops over login screen.
 489             if (strpos($_POST['returnurl'], 'do=login') === false) {
 490                 header('Location: '. generateLocation($_POST['returnurl'], $_SERVER['HTTP_HOST']));
 491                 exit;
 492             }
 493         }
 494         header('Location: ?'); exit;
 495     }
 496     else
 497     {
 498         ban_loginFailed();
 499         $redir = '&username='. $_POST['login'];
 500         if (isset($_GET['post'])) {
 501             $redir .= '&post=' . urlencode($_GET['post']);
 502             foreach (array('description', 'source', 'title') as $param) {
 503                 if (!empty($_GET[$param])) {
 504                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 505                 }
 506             }
 507         }
 508         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 509         exit;
 510     }
 511 }
 512
 513 // ------------------------------------------------------------------------------------------
 514 // Misc utility functions:
 515
 516 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 517 function return_bytes($val)
 518 {
 519     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 520     switch($last)
 521     {
 522         case 'g': $val *= 1024;
 523         case 'm': $val *= 1024;
 524         case 'k': $val *= 1024;
 525     }
 526     return $val;
 527 }
 528
 529 // Try to determine max file size for uploads (POST).
 530 // Returns an integer (in bytes)
 531 function getMaxFileSize()
 532 {
 533     $size1 = return_bytes(ini_get('post_max_size'));
 534     $size2 = return_bytes(ini_get('upload_max_filesize'));
 535     // Return the smaller of two:
 536     $maxsize = min($size1,$size2);
 537     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 538     return $maxsize;
 539 }
 540
 541 // ------------------------------------------------------------------------------------------
 542 // Token management for XSRF protection
 543 // Token should be used in any form which acts on data (create,update,delete,import...).
 544 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 545
 546 // Returns a token.
 547 function getToken()
 548 {
 549     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 550     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 551     return $rnd;
 552 }
 553
 554 // Tells if a token is OK. Using this function will destroy the token.
 555 // true=token is OK.
 556 function tokenOk($token)
 557 {
 558     if (isset($_SESSION['tokens'][$token]))
 559     {
 560         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 561         return true; // Token is OK.
 562     }
 563     return false; // Wrong token, or already used.
 564 }
 565
 566 // ------------------------------------------------------------------------------------------
 567 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 568 // Gives the last 7 days (which have links).
 569 // This RSS feed cannot be filtered.
 570 function showDailyRSS() {
 571     // Cache system
 572     $query = $_SERVER['QUERY_STRING'];
 573     $cache = new CachedPage(
 574         $GLOBALS['config']['PAGECACHE'],
 575         page_url($_SERVER),
 576         startsWith($query,'do=dailyrss') && !isLoggedIn()
 577     );
 578     $cached = $cache->cachedVersion();
 579     if (!empty($cached)) {
 580         echo $cached;
 581         exit;
 582     }
 583
 584     // If cached was not found (or not usable), then read the database and build the response:
 585     // Read links from database (and filter private links if used it not logged in).
 586     $LINKSDB = new LinkDB(
 587         $GLOBALS['config']['DATASTORE'],
 588         isLoggedIn(),
 589         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 590         $GLOBALS['redirector'],
 591         $GLOBALS['config']['REDIRECTOR_URLENCODE']
 592     );
 593
 594     /* Some Shaarlies may have very few links, so we need to look
 595        back in time (rsort()) until we have enough days ($nb_of_days).
 596     */
 597     $linkdates = array();
 598     foreach ($LINKSDB as $linkdate => $value) {
 599         $linkdates[] = $linkdate;
 600     }
 601     rsort($linkdates);
 602     $nb_of_days = 7; // We take 7 days.
 603     $today = Date('Ymd');
 604     $days = array();
 605
 606     foreach ($linkdates as $linkdate) {
 607         $day = substr($linkdate, 0, 8); // Extract day (without time)
 608         if (strcmp($day,$today) < 0) {
 609             if (empty($days[$day])) {
 610                 $days[$day] = array();
 611             }
 612             $days[$day][] = $linkdate;
 613         }
 614
 615         if (count($days) > $nb_of_days) {
 616             break; // Have we collected enough days?
 617         }
 618     }
 619
 620     // Build the RSS feed.
 621     header('Content-Type: application/rss+xml; charset=utf-8');
 622     $pageaddr = escape(index_url($_SERVER));
 623     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 624     echo '<channel>';
 625     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 626     echo '<link>'. $pageaddr .'</link>';
 627     echo '<description>Daily shared links</description>';
 628     echo '<language>en-en</language>';
 629     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 630
 631     // For each day.
 632     foreach ($days as $day => $linkdates) {
 633         $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 634         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 635
 636         // Build the HTML body of this RSS entry.
 637         $html = '';
 638         $href = '';
 639         $links = array();
 640
 641         // We pre-format some fields for proper output.
 642         foreach ($linkdates as $linkdate) {
 643             $l = $LINKSDB[$linkdate];
 644             $l['formatedDescription'] = format_description($l['description'], $GLOBALS['redirector']);
 645             $l['thumbnail'] = thumbnail($l['url']);
 646             $l_date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $l['linkdate']);
 647             $l['timestamp'] = $l_date->getTimestamp();
 648             if (startsWith($l['url'], '?')) {
 649                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 650             }
 651             $links[$linkdate] = $l;
 652         }
 653
 654         // Then build the HTML for this day:
 655         $tpl = new RainTPL;
 656         $tpl->assign('title', $GLOBALS['title']);
 657         $tpl->assign('daydate', $dayDate->getTimestamp());
 658         $tpl->assign('absurl', $absurl);
 659         $tpl->assign('links', $links);
 660         $tpl->assign('rssdate', escape($dayDate->format(DateTime::RSS)));
 661         $html = $tpl->draw('dailyrss', $return_string=true);
 662
 663         echo $html . PHP_EOL;
 664     }
 665     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
 666
 667     $cache->cache(ob_get_contents());
 668     ob_end_flush();
 669     exit;
 670 }
 671
 672 /**
 673  * Show the 'Daily' page.
 674  *
 675  * @param PageBuilder $pageBuilder Template engine wrapper.
 676  * @param LinkDB $LINKSDB LinkDB instance.
 677  */
 678 function showDaily($pageBuilder, $LINKSDB)
 679 {
 680     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 681     if (isset($_GET['day'])) $day=$_GET['day'];
 682
 683     $days = $LINKSDB->days();
 684     $i = array_search($day,$days);
 685     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
 686     $previousday='';
 687     $nextday='';
 688     if ($i!==false)
 689     {
 690         if ($i>=1) $previousday=$days[$i-1];
 691         if ($i<count($days)-1) $nextday=$days[$i+1];
 692     }
 693
 694     try {
 695         $linksToDisplay = $LINKSDB->filterDay($day);
 696     } catch (Exception $exc) {
 697         error_log($exc);
 698         $linksToDisplay = array();
 699     }
 700
 701     // We pre-format some fields for proper output.
 702     foreach($linksToDisplay as $key=>$link)
 703     {
 704
 705         $taglist = explode(' ',$link['tags']);
 706         uasort($taglist, 'strcasecmp');
 707         $linksToDisplay[$key]['taglist']=$taglist;
 708         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $GLOBALS['redirector']);
 709         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
 710         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
 711         $linksToDisplay[$key]['timestamp'] = $date->getTimestamp();
 712     }
 713
 714     /* We need to spread the articles on 3 columns.
 715        I did not want to use a JavaScript lib like http://masonry.desandro.com/
 716        so I manually spread entries with a simple method: I roughly evaluate the
 717        height of a div according to title and description length.
 718     */
 719     $columns=array(array(),array(),array()); // Entries to display, for each column.
 720     $fill=array(0,0,0);  // Rough estimate of columns fill.
 721     foreach($linksToDisplay as $key=>$link)
 722     {
 723         // Roughly estimate length of entry (by counting characters)
 724         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
 725         // Description: 836 characters gives roughly 342 pixel height.
 726         // This is not perfect, but it's usually OK.
 727         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
 728         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
 729         // Then put in column which is the less filled:
 730         $smallest=min($fill); // find smallest value in array.
 731         $index=array_search($smallest,$fill); // find index of this smallest value.
 732         array_push($columns[$index],$link); // Put entry in this column.
 733         $fill[$index]+=$length;
 734     }
 735
 736     $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 737     $data = array(
 738         'linksToDisplay' => $linksToDisplay,
 739         'cols' => $columns,
 740         'day' => $dayDate->getTimestamp(),
 741         'previousday' => $previousday,
 742         'nextday' => $nextday,
 743     );
 744     $pluginManager = PluginManager::getInstance();
 745     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
 746
 747     foreach ($data as $key => $value) {
 748         $pageBuilder->assign($key, $value);
 749     }
 750
 751     $pageBuilder->renderPage('daily');
 752     exit;
 753 }
 754
 755 // Renders the linklist
 756 function showLinkList($PAGE, $LINKSDB) {
 757     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
 758     $PAGE->renderPage('linklist');
 759 }
 760
 761
 762 // ------------------------------------------------------------------------------------------
 763 // Render HTML page (according to URL parameters and user rights)
 764 function renderPage()
 765 {
 766     $LINKSDB = new LinkDB(
 767         $GLOBALS['config']['DATASTORE'],
 768         isLoggedIn(),
 769         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 770         $GLOBALS['redirector'],
 771         $GLOBALS['config']['REDIRECTOR_URLENCODE']
 772     );
 773
 774     $updater = new Updater(
 775         read_updates_file($GLOBALS['config']['UPDATES_FILE']),
 776         $GLOBALS,
 777         $LINKSDB,
 778         isLoggedIn()
 779     );
 780     try {
 781         $newUpdates = $updater->update();
 782         if (! empty($newUpdates)) {
 783             write_updates_file(
 784                 $GLOBALS['config']['UPDATES_FILE'],
 785                 $updater->getDoneUpdates()
 786             );
 787         }
 788     }
 789     catch(Exception $e) {
 790         die($e->getMessage());
 791     }
 792
 793     $PAGE = new PageBuilder();
 794     $PAGE->assign('linkcount', count($LINKSDB));
 795     $PAGE->assign('privateLinkcount', count_private($LINKSDB));
 796
 797     // Determine which page will be rendered.
 798     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
 799     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
 800
 801     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
 802     // Then assign generated data to RainTPL.
 803     $common_hooks = array(
 804         'includes',
 805         'header',
 806         'footer',
 807     );
 808     $pluginManager = PluginManager::getInstance();
 809     foreach($common_hooks as $name) {
 810         $plugin_data = array();
 811         $pluginManager->executeHooks('render_' . $name, $plugin_data,
 812             array(
 813                 'target' => $targetPage,
 814                 'loggedin' => isLoggedIn()
 815             )
 816         );
 817         $PAGE->assign('plugins_' . $name, $plugin_data);
 818     }
 819
 820     // -------- Display login form.
 821     if ($targetPage == Router::$PAGE_LOGIN)
 822     {
 823         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
 824         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
 825         $PAGE->assign('token',$token);
 826         if (isset($_GET['username'])) {
 827             $PAGE->assign('username', escape($_GET['username']));
 828         }
 829         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
 830         $PAGE->renderPage('loginform');
 831         exit;
 832     }
 833     // -------- User wants to logout.
 834     if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=logout'))
 835     {
 836         invalidateCaches($GLOBALS['config']['PAGECACHE']);
 837         logout();
 838         header('Location: ?');
 839         exit;
 840     }
 841
 842     // -------- Picture wall
 843     if ($targetPage == Router::$PAGE_PICWALL)
 844     {
 845         // Optionally filter the results:
 846         $links = $LINKSDB->filterSearch($_GET);
 847         $linksToDisplay = array();
 848
 849         // Get only links which have a thumbnail.
 850         foreach($links as $link)
 851         {
 852             $permalink='?'.escape(smallhash($link['linkdate']));
 853             $thumb=lazyThumbnail($link['url'],$permalink);
 854             if ($thumb!='') // Only output links which have a thumbnail.
 855             {
 856                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
 857                 $linksToDisplay[]=$link; // Add to array.
 858             }
 859         }
 860
 861         $data = array(
 862             'linksToDisplay' => $linksToDisplay,
 863         );
 864         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
 865
 866         foreach ($data as $key => $value) {
 867             $PAGE->assign($key, $value);
 868         }
 869
 870         $PAGE->renderPage('picwall');
 871         exit;
 872     }
 873
 874     // -------- Tag cloud
 875     if ($targetPage == Router::$PAGE_TAGCLOUD)
 876     {
 877         $tags= $LINKSDB->allTags();
 878
 879         // We sort tags alphabetically, then choose a font size according to count.
 880         // First, find max value.
 881         $maxcount = 0;
 882         foreach ($tags as $value) {
 883             $maxcount = max($maxcount, $value);
 884         }
 885
 886         // Sort tags alphabetically: case insensitive, support locale if avalaible.
 887         uksort($tags, function($a, $b) {
 888             // Collator is part of PHP intl.
 889             if (class_exists('Collator')) {
 890                 $c = new Collator(setlocale(LC_COLLATE, 0));
 891                 if (!intl_is_failure(intl_get_error_code())) {
 892                     return $c->compare($a, $b);
 893                 }
 894             }
 895             return strcasecmp($a, $b);
 896         });
 897
 898         $tagList = array();
 899         foreach($tags as $key => $value) {
 900             // Tag font size scaling:
 901             //   default 15 and 30 logarithm bases affect scaling,
 902             //   22 and 6 are arbitrary font sizes for max and min sizes.
 903             $size = log($value, 15) / log($maxcount, 30) * 2.2 + 0.8;
 904             $tagList[$key] = array(
 905                 'count' => $value,
 906                 'size' => number_format($size, 2, '.', ''),
 907             );
 908         }
 909
 910         $data = array(
 911             'tags' => $tagList,
 912         );
 913         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
 914
 915         foreach ($data as $key => $value) {
 916             $PAGE->assign($key, $value);
 917         }
 918
 919         $PAGE->renderPage('tagcloud');
 920         exit;
 921     }
 922
 923     // Daily page.
 924     if ($targetPage == Router::$PAGE_DAILY) {
 925         showDaily($PAGE, $LINKSDB);
 926     }
 927
 928     // ATOM and RSS feed.
 929     if ($targetPage == Router::$PAGE_FEED_ATOM || $targetPage == Router::$PAGE_FEED_RSS) {
 930         $feedType = $targetPage == Router::$PAGE_FEED_RSS ? FeedBuilder::$FEED_RSS : FeedBuilder::$FEED_ATOM;
 931         header('Content-Type: application/'. $feedType .'+xml; charset=utf-8');
 932
 933         // Cache system
 934         $query = $_SERVER['QUERY_STRING'];
 935         $cache = new CachedPage(
 936             $GLOBALS['config']['PAGECACHE'],
 937             page_url($_SERVER),
 938             startsWith($query,'do='. $targetPage) && !isLoggedIn()
 939         );
 940         $cached = $cache->cachedVersion();
 941         if (!empty($cached)) {
 942             echo $cached;
 943             exit;
 944         }
 945
 946         // Generate data.
 947         $feedGenerator = new FeedBuilder($LINKSDB, $feedType, $_SERVER, $_GET, isLoggedIn());
 948         $feedGenerator->setLocale(strtolower(setlocale(LC_COLLATE, 0)));
 949         $feedGenerator->setHideDates($GLOBALS['config']['HIDE_TIMESTAMPS'] && !isLoggedIn());
 950         $feedGenerator->setUsePermalinks(isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS']);
 951         if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) {
 952             $feedGenerator->setPubsubhubUrl($GLOBALS['config']['PUBSUBHUB_URL']);
 953         }
 954         $data = $feedGenerator->buildData();
 955
 956         // Process plugin hook.
 957         $pluginManager = PluginManager::getInstance();
 958         $pluginManager->executeHooks('render_feed', $data, array(
 959             'loggedin' => isLoggedIn(),
 960             'target' => $targetPage,
 961         ));
 962
 963         // Render the template.
 964         $PAGE->assignAll($data);
 965         $PAGE->renderPage('feed.'. $feedType);
 966         $cache->cache(ob_get_contents());
 967         ob_end_flush();
 968         exit;
 969     }
 970
 971     // Display openseach plugin (XML)
 972     if ($targetPage == Router::$PAGE_OPENSEARCH) {
 973         header('Content-Type: application/xml; charset=utf-8');
 974         $PAGE->assign('serverurl', index_url($_SERVER));
 975         $PAGE->renderPage('opensearch');
 976         exit;
 977     }
 978
 979     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
 980     if (isset($_GET['addtag']))
 981     {
 982         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
 983         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
 984         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
 985
 986         // Prevent redirection loop
 987         if (isset($params['addtag'])) {
 988             unset($params['addtag']);
 989         }
 990
 991         // Check if this tag is already in the search query and ignore it if it is.
 992         // Each tag is always separated by a space
 993         if (isset($params['searchtags'])) {
 994             $current_tags = explode(' ', $params['searchtags']);
 995         } else {
 996             $current_tags = array();
 997         }
 998         $addtag = true;
 999         foreach ($current_tags as $value) {
1000             if ($value === $_GET['addtag']) {
1001                 $addtag = false;
1002                 break;
1003             }
1004         }
1005         // Append the tag if necessary
1006         if (empty($params['searchtags'])) {
1007             $params['searchtags'] = trim($_GET['addtag']);
1008         }
1009         else if ($addtag) {
1010             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1011         }
1012
1013         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1014         header('Location: ?'.http_build_query($params));
1015         exit;
1016     }
1017
1018     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1019     if (isset($_GET['removetag'])) {
1020         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1021         if (empty($_SERVER['HTTP_REFERER'])) {
1022             header('Location: ?');
1023             exit;
1024         }
1025
1026         // In case browser does not send HTTP_REFERER
1027         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1028
1029         // Prevent redirection loop
1030         if (isset($params['removetag'])) {
1031             unset($params['removetag']);
1032         }
1033
1034         if (isset($params['searchtags'])) {
1035             $tags = explode(' ', $params['searchtags']);
1036             // Remove value from array $tags.
1037             $tags = array_diff($tags, array($_GET['removetag']));
1038             $params['searchtags'] = implode(' ',$tags);
1039
1040             if (empty($params['searchtags'])) {
1041                 unset($params['searchtags']);
1042             }
1043
1044             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1045         }
1046         header('Location: ?'.http_build_query($params));
1047         exit;
1048     }
1049
1050     // -------- User wants to change the number of links per page (linksperpage=...)
1051     if (isset($_GET['linksperpage'])) {
1052         if (is_numeric($_GET['linksperpage'])) {
1053             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1054         }
1055
1056         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1057         exit;
1058     }
1059
1060     // -------- User wants to see only private links (toggle)
1061     if (isset($_GET['privateonly'])) {
1062         if (empty($_SESSION['privateonly'])) {
1063             $_SESSION['privateonly'] = 1; // See only private links
1064         } else {
1065             unset($_SESSION['privateonly']); // See all links
1066         }
1067
1068         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1069         exit;
1070     }
1071
1072     // -------- Handle other actions allowed for non-logged in users:
1073     if (!isLoggedIn())
1074     {
1075         // User tries to post new link but is not logged in:
1076         // Show login screen, then redirect to ?post=...
1077         if (isset($_GET['post']))
1078         {
1079             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1080             exit;
1081         }
1082
1083         showLinkList($PAGE, $LINKSDB);
1084         if (isset($_GET['edit_link'])) {
1085             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1086             exit;
1087         }
1088
1089         exit; // Never remove this one! All operations below are reserved for logged in user.
1090     }
1091
1092     // -------- All other functions are reserved for the registered user:
1093
1094     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1095     if ($targetPage == Router::$PAGE_TOOLS)
1096     {
1097         $data = array(
1098             'pageabsaddr' => index_url($_SERVER),
1099         );
1100         $pluginManager->executeHooks('render_tools', $data);
1101
1102         foreach ($data as $key => $value) {
1103             $PAGE->assign($key, $value);
1104         }
1105
1106         $PAGE->renderPage('tools');
1107         exit;
1108     }
1109
1110     // -------- User wants to change his/her password.
1111     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1112     {
1113         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1114         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1115         {
1116             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1117
1118             // Make sure old password is correct.
1119             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1120             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1121             // Save new password
1122             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1123             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1124             try {
1125                 writeConfig($GLOBALS, isLoggedIn());
1126             }
1127             catch(Exception $e) {
1128                 error_log(
1129                     'ERROR while writing config file after changing password.' . PHP_EOL .
1130                     $e->getMessage()
1131                 );
1132
1133                 // TODO: do not handle exceptions/errors in JS.
1134                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1135                 exit;
1136             }
1137             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1138             exit;
1139         }
1140         else // show the change password form.
1141         {
1142             $PAGE->assign('token',getToken());
1143             $PAGE->renderPage('changepassword');
1144             exit;
1145         }
1146     }
1147
1148     // -------- User wants to change configuration
1149     if ($targetPage == Router::$PAGE_CONFIGURE)
1150     {
1151         if (!empty($_POST['title']) )
1152         {
1153             if (!tokenOk($_POST['token'])) {
1154                 die('Wrong token.'); // Go away!
1155             }
1156             $tz = 'UTC';
1157             if (!empty($_POST['continent']) && !empty($_POST['city'])
1158                 && isTimeZoneValid($_POST['continent'], $_POST['city'])
1159             ) {
1160                 $tz = $_POST['continent'] . '/' . $_POST['city'];
1161             }
1162             $GLOBALS['timezone'] = $tz;
1163             $GLOBALS['title']=$_POST['title'];
1164             $GLOBALS['titleLink']=$_POST['titleLink'];
1165             $GLOBALS['redirector']=$_POST['redirector'];
1166             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1167             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1168             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1169             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1170             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1171             try {
1172                 writeConfig($GLOBALS, isLoggedIn());
1173             }
1174             catch(Exception $e) {
1175                 error_log(
1176                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1177                     $e->getMessage()
1178                 );
1179
1180                 // TODO: do not handle exceptions/errors in JS.
1181                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1182                 exit;
1183             }
1184             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1185             exit;
1186         }
1187         else // Show the configuration form.
1188         {
1189             $PAGE->assign('token',getToken());
1190             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1191             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1192             list($timezone_form, $timezone_js) = generateTimeZoneForm($GLOBALS['timezone']);
1193             $PAGE->assign('timezone_form', $timezone_form);
1194             $PAGE->assign('timezone_js',$timezone_js);
1195             $PAGE->renderPage('configure');
1196             exit;
1197         }
1198     }
1199
1200     // -------- User wants to rename a tag or delete it
1201     if ($targetPage == Router::$PAGE_CHANGETAG)
1202     {
1203         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1204             $PAGE->assign('token', getToken());
1205             $PAGE->assign('tags', $LINKSDB->allTags());
1206             $PAGE->renderPage('changetag');
1207             exit;
1208         }
1209
1210         if (!tokenOk($_POST['token'])) {
1211             die('Wrong token.');
1212         }
1213
1214         // Delete a tag:
1215         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1216             $needle = trim($_POST['fromtag']);
1217             // True for case-sensitive tag search.
1218             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1219             foreach($linksToAlter as $key=>$value)
1220             {
1221                 $tags = explode(' ',trim($value['tags']));
1222                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1223                 $value['tags']=trim(implode(' ',$tags));
1224                 $LINKSDB[$key]=$value;
1225             }
1226             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1227             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1228             exit;
1229         }
1230
1231         // Rename a tag:
1232         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1233             $needle = trim($_POST['fromtag']);
1234             // True for case-sensitive tag search.
1235             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1236             foreach($linksToAlter as $key=>$value)
1237             {
1238                 $tags = explode(' ',trim($value['tags']));
1239                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1240                 $value['tags']=trim(implode(' ',$tags));
1241                 $LINKSDB[$key]=$value;
1242             }
1243             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1244             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1245             exit;
1246         }
1247     }
1248
1249     // -------- User wants to add a link without using the bookmarklet: Show form.
1250     if ($targetPage == Router::$PAGE_ADDLINK)
1251     {
1252         $PAGE->renderPage('addlink');
1253         exit;
1254     }
1255
1256     // -------- User clicked the "Save" button when editing a link: Save link to database.
1257     if (isset($_POST['save_edit']))
1258     {
1259         // Go away!
1260         if (! tokenOk($_POST['token'])) {
1261             die('Wrong token.');
1262         }
1263         // Remove multiple spaces.
1264         $tags = trim(preg_replace('/\s\s+/', ' ', $_POST['lf_tags']));
1265         // Remove first '-' char in tags.
1266         $tags = preg_replace('/(^| )\-/', '$1', $tags);
1267         // Remove duplicates.
1268         $tags = implode(' ', array_unique(explode(' ', $tags)));
1269         $linkdate = $_POST['lf_linkdate'];
1270         $url = trim($_POST['lf_url']);
1271         if (! startsWith($url, 'http:') && ! startsWith($url, 'https:')
1272             && ! startsWith($url, 'ftp:') && ! startsWith($url, 'magnet:')
1273             && ! startsWith($url, '?') && ! startsWith($url, 'javascript:')
1274         ) {
1275             $url = 'http://' . $url;
1276         }
1277
1278         $link = array(
1279             'title' => trim($_POST['lf_title']),
1280             'url' => $url,
1281             'description' => $_POST['lf_description'],
1282             'private' => (isset($_POST['lf_private']) ? 1 : 0),
1283             'linkdate' => $linkdate,
1284             'tags' => str_replace(',', ' ', $tags)
1285         );
1286         // If title is empty, use the URL as title.
1287         if ($link['title'] == '') {
1288             $link['title'] = $link['url'];
1289         }
1290
1291         $pluginManager->executeHooks('save_link', $link);
1292
1293         $LINKSDB[$linkdate] = $link;
1294         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1295         pubsubhub();
1296
1297         // If we are called from the bookmarklet, we must close the popup:
1298         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1299             echo '<script>self.close();</script>';
1300             exit;
1301         }
1302
1303         $returnurl = !empty($_POST['returnurl']) ? $_POST['returnurl'] : '?';
1304         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1305         // Scroll to the link which has been edited.
1306         $location .= '#' . smallHash($_POST['lf_linkdate']);
1307         // After saving the link, redirect to the page the user was on.
1308         header('Location: '. $location);
1309         exit;
1310     }
1311
1312     // -------- User clicked the "Cancel" button when editing a link.
1313     if (isset($_POST['cancel_edit']))
1314     {
1315         // If we are called from the bookmarklet, we must close the popup:
1316         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1317         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1318         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1319         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1320         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1321         exit;
1322     }
1323
1324     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1325     if (isset($_POST['delete_link']))
1326     {
1327         if (!tokenOk($_POST['token'])) die('Wrong token.');
1328         // We do not need to ask for confirmation:
1329         // - confirmation is handled by JavaScript
1330         // - we are protected from XSRF by the token.
1331         $linkdate=$_POST['lf_linkdate'];
1332
1333         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1334
1335         unset($LINKSDB[$linkdate]);
1336         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // save to disk
1337
1338         // If we are called from the bookmarklet, we must close the popup:
1339         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1340         // Pick where we're going to redirect
1341         // =============================================================
1342         // Basically, we can't redirect to where we were previously if it was a permalink
1343         // or an edit_link, because it would 404.
1344         // Cases:
1345         //    - /             : nothing in $_GET, redirect to self
1346         //    - /?page        : redirect to self
1347         //    - /?searchterm  : redirect to self (there might be other links)
1348         //    - /?searchtags  : redirect to self
1349         //    - /permalink    : redirect to / (the link does not exist anymore)
1350         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1351         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1352         // redirect is not satisfied, and only then redirect to /
1353         $location = "?";
1354         // Self redirection
1355         if (count($_GET) == 0
1356             || isset($_GET['page'])
1357             || isset($_GET['searchterm'])
1358             || isset($_GET['searchtags'])
1359         ) {
1360             if (isset($_POST['returnurl'])) {
1361                 $location = $_POST['returnurl']; // Handle redirects given by the form
1362             } else {
1363                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1364             }
1365         }
1366
1367         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1368         exit;
1369     }
1370
1371     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1372     if (isset($_GET['edit_link']))
1373     {
1374         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1375         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1376         $data = array(
1377             'link' => $link,
1378             'link_is_new' => false,
1379             'token' => getToken(),
1380             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1381             'tags' => $LINKSDB->allTags(),
1382         );
1383         $pluginManager->executeHooks('render_editlink', $data);
1384
1385         foreach ($data as $key => $value) {
1386             $PAGE->assign($key, $value);
1387         }
1388
1389         $PAGE->renderPage('editlink');
1390         exit;
1391     }
1392
1393     // -------- User want to post a new link: Display link edit form.
1394     if (isset($_GET['post'])) {
1395         $url = cleanup_url($_GET['post']);
1396
1397         $link_is_new = false;
1398         // Check if URL is not already in database (in this case, we will edit the existing link)
1399         $link = $LINKSDB->getLinkFromUrl($url);
1400         if (!$link)
1401         {
1402             $link_is_new = true;
1403             $linkdate = strval(date('Ymd_His'));
1404             // Get title if it was provided in URL (by the bookmarklet).
1405             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1406             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1407             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1408             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1409             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1410             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1411             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1412                 // Short timeout to keep the application responsive
1413                 list($headers, $content) = get_http_response($url, 4);
1414                 if (strpos($headers[0], '200 OK') !== false) {
1415                     // Retrieve charset.
1416                     $charset = get_charset($headers, $content);
1417                     // Extract title.
1418                     $title = html_extract_title($content);
1419                     // Re-encode title in utf-8 if necessary.
1420                     if (! empty($title) && strtolower($charset) != 'utf-8') {
1421                         $title = mb_convert_encoding($title, 'utf-8', $charset);
1422                     }
1423                 }
1424             }
1425
1426             if ($url == '') {
1427                 $url = '?' . smallHash($linkdate);
1428                 $title = 'Note: ';
1429             }
1430             $url = escape($url);
1431             $title = escape($title);
1432
1433             $link = array(
1434                 'linkdate' => $linkdate,
1435                 'title' => $title,
1436                 'url' => $url,
1437                 'description' => $description,
1438                 'tags' => $tags,
1439                 'private' => $private
1440             );
1441         }
1442
1443         $data = array(
1444             'link' => $link,
1445             'link_is_new' => $link_is_new,
1446             'token' => getToken(), // XSRF protection.
1447             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1448             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1449             'tags' => $LINKSDB->allTags(),
1450         );
1451         $pluginManager->executeHooks('render_editlink', $data);
1452
1453         foreach ($data as $key => $value) {
1454             $PAGE->assign($key, $value);
1455         }
1456
1457         $PAGE->renderPage('editlink');
1458         exit;
1459     }
1460
1461     if ($targetPage == Router::$PAGE_EXPORT) {
1462         // Export links as a Netscape Bookmarks file
1463
1464         if (empty($_GET['selection'])) {
1465             $PAGE->renderPage('export');
1466             exit;
1467         }
1468
1469         // export as bookmarks_(all|private|public)_YYYYmmdd_HHMMSS.html
1470         $selection = $_GET['selection'];
1471         if (isset($_GET['prepend_note_url'])) {
1472             $prependNoteUrl = $_GET['prepend_note_url'];
1473         } else {
1474             $prependNoteUrl = false;
1475         }
1476
1477         try {
1478             $PAGE->assign(
1479                 'links',
1480                 NetscapeBookmarkUtils::filterAndFormat(
1481                     $LINKSDB,
1482                     $selection,
1483                     $prependNoteUrl,
1484                     index_url($_SERVER)
1485                 )
1486             );
1487         } catch (Exception $exc) {
1488             header('Content-Type: text/plain; charset=utf-8');
1489             echo $exc->getMessage();
1490             exit;
1491         }
1492         $now = new DateTime();
1493         header('Content-Type: text/html; charset=utf-8');
1494         header(
1495             'Content-disposition: attachment; filename=bookmarks_'
1496            .$selection.'_'.$now->format(LinkDB::LINK_DATE_FORMAT).'.html'
1497         );
1498         $PAGE->assign('date', $now->format(DateTime::RFC822));
1499         $PAGE->assign('eol', PHP_EOL);
1500         $PAGE->assign('selection', $selection);
1501         $PAGE->renderPage('export.bookmarks');
1502         exit;
1503     }
1504
1505     // -------- User is uploading a file for import
1506     if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=upload'))
1507     {
1508         // If file is too big, some form field may be missing.
1509         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1510         {
1511             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1512             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1513             exit;
1514         }
1515         if (!tokenOk($_POST['token'])) die('Wrong token.');
1516         importFile($LINKSDB);
1517         exit;
1518     }
1519
1520     // -------- Show upload/import dialog:
1521     if ($targetPage == Router::$PAGE_IMPORT)
1522     {
1523         $PAGE->assign('token',getToken());
1524         $PAGE->assign('maxfilesize',getMaxFileSize());
1525         $PAGE->renderPage('import');
1526         exit;
1527     }
1528
1529     // Plugin administration page
1530     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1531         $pluginMeta = $pluginManager->getPluginsMeta();
1532
1533         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1534         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1535         // Load parameters.
1536         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $GLOBALS['plugins']);
1537         uasort(
1538             $enabledPlugins,
1539             function($a, $b) { return $a['order'] - $b['order']; }
1540         );
1541         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1542
1543         $PAGE->assign('enabledPlugins', $enabledPlugins);
1544         $PAGE->assign('disabledPlugins', $disabledPlugins);
1545         $PAGE->renderPage('pluginsadmin');
1546         exit;
1547     }
1548
1549     // Plugin administration form action
1550     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1551         try {
1552             if (isset($_POST['parameters_form'])) {
1553                 unset($_POST['parameters_form']);
1554                 foreach ($_POST as $param => $value) {
1555                     $GLOBALS['plugins'][$param] = escape($value);
1556                 }
1557             }
1558             else {
1559                 $GLOBALS['config']['ENABLED_PLUGINS'] = save_plugin_config($_POST);
1560             }
1561             writeConfig($GLOBALS, isLoggedIn());
1562         }
1563         catch (Exception $e) {
1564             error_log(
1565                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1566                 $e->getMessage()
1567             );
1568
1569             // TODO: do not handle exceptions/errors in JS.
1570             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do='. Router::$PAGE_PLUGINSADMIN .'\';</script>';
1571             exit;
1572         }
1573         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1574         exit;
1575     }
1576
1577     // -------- Otherwise, simply display search form and links:
1578     showLinkList($PAGE, $LINKSDB);
1579     exit;
1580 }
1581
1582 // -----------------------------------------------------------------------------------------------
1583 // Process the import file form.
1584 function importFile($LINKSDB)
1585 {
1586     if (!isLoggedIn()) { die('Not allowed.'); }
1587
1588     $filename=$_FILES['filetoupload']['name'];
1589     $filesize=$_FILES['filetoupload']['size'];
1590     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1591     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1592     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1593     $import_count=0;
1594
1595     // Sniff file type:
1596     $type='unknown';
1597     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1598
1599     // Then import the bookmarks.
1600     if ($type=='netscape')
1601     {
1602         // This is a standard Netscape-style bookmark file.
1603         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1604         foreach(explode('<DT>',$data) as $html) // explode is very fast
1605         {
1606             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1607             $d = explode('<DD>',$html);
1608             if (startsWith($d[0], '<A '))
1609             {
1610                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1611                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1612                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1613                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1614                 $raw_add_date=0;
1615                 foreach($matches as $m)
1616                 {
1617                     $attr=$m[1]; $value=$m[2];
1618                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1619                     elseif ($attr=='ADD_DATE')
1620                     {
1621                         $raw_add_date=intval($value);
1622                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1623                     }
1624                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1625                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1626                 }
1627                 if ($link['url']!='')
1628                 {
1629                     if ($private==1) $link['private']=1;
1630                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1631                     if ($dblink==false)
1632                     {  // Link not in database, let's import it...
1633                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1634
1635                        // Make sure date/time is not already used by another link.
1636                        // (Some bookmark files have several different links with the same ADD_DATE)
1637                        // We increment date by 1 second until we find a date which is not used in DB.
1638                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1639                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1640                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1641                        $LINKSDB[$link['linkdate']] = $link;
1642                        $import_count++;
1643                     }
1644                     else // Link already present in database.
1645                     {
1646                         if ($overwrite)
1647                         {   // If overwrite is required, we import link data, except date/time.
1648                             $link['linkdate']=$dblink['linkdate'];
1649                             $LINKSDB[$link['linkdate']] = $link;
1650                             $import_count++;
1651                         }
1652                     }
1653
1654                 }
1655             }
1656         }
1657         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1658
1659         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1660     }
1661     else
1662     {
1663         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1664     }
1665 }
1666
1667 /**
1668  * Template for the list of links (<div id="linklist">)
1669  * This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1670  *
1671  * @param pageBuilder $PAGE    pageBuilder instance.
1672  * @param LinkDB      $LINKSDB LinkDB instance.
1673  */
1674 function buildLinkList($PAGE,$LINKSDB)
1675 {
1676     // Used in templates
1677     $searchtags = !empty($_GET['searchtags']) ? escape($_GET['searchtags']) : '';
1678     $searchterm = !empty($_GET['searchterm']) ? escape($_GET['searchterm']) : '';
1679
1680     // Smallhash filter
1681     if (! empty($_SERVER['QUERY_STRING'])
1682         && preg_match('/^[a-zA-Z0-9-_@]{6}($|&|#)/', $_SERVER['QUERY_STRING'])) {
1683         try {
1684             $linksToDisplay = $LINKSDB->filterHash($_SERVER['QUERY_STRING']);
1685         } catch (LinkNotFoundException $e) {
1686             $PAGE->render404($e->getMessage());
1687             exit;
1688         }
1689     } else {
1690         // Filter links according search parameters.
1691         $privateonly = !empty($_SESSION['privateonly']);
1692         $linksToDisplay = $LINKSDB->filterSearch($_GET, false, $privateonly);
1693     }
1694
1695     // ---- Handle paging.
1696     $keys = array();
1697     foreach ($linksToDisplay as $key => $value) {
1698         $keys[] = $key;
1699     }
1700
1701     // If there is only a single link, we change on-the-fly the title of the page.
1702     if (count($linksToDisplay) == 1) {
1703         $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1704     }
1705
1706     // Select articles according to paging.
1707     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1708     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1709     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1710     $page = $page < 1 ? 1 : $page;
1711     $page = $page > $pagecount ? $pagecount : $page;
1712     // Start index.
1713     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1714     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1715     $linkDisp = array();
1716     while ($i<$end && $i<count($keys))
1717     {
1718         $link = $linksToDisplay[$keys[$i]];
1719         $link['description'] = format_description($link['description'], $GLOBALS['redirector']);
1720         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
1721         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
1722         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
1723         $link['timestamp'] = $date->getTimestamp();
1724         $taglist = explode(' ', $link['tags']);
1725         uasort($taglist, 'strcasecmp');
1726         $link['taglist'] = $taglist;
1727         $link['shorturl'] = smallHash($link['linkdate']);
1728         // Check for both signs of a note: starting with ? and 7 chars long.
1729         if ($link['url'][0] === '?' &&
1730             strlen($link['url']) === 7) {
1731             $link['url'] = index_url($_SERVER) . $link['url'];
1732         }
1733
1734         $linkDisp[$keys[$i]] = $link;
1735         $i++;
1736     }
1737
1738     // Compute paging navigation
1739     $searchtagsUrl = empty($searchtags) ? '' : '&searchtags=' . urlencode($searchtags);
1740     $searchtermUrl = empty($searchterm) ? '' : '&searchterm=' . urlencode($searchterm);
1741     $previous_page_url = '';
1742     if ($i != count($keys)) {
1743         $previous_page_url = '?page=' . ($page+1) . $searchtermUrl . $searchtagsUrl;
1744     }
1745     $next_page_url='';
1746     if ($page>1) {
1747         $next_page_url = '?page=' . ($page-1) . $searchtermUrl . $searchtagsUrl;
1748     }
1749
1750     $token = isLoggedIn() ? getToken() : '';
1751
1752     // Fill all template fields.
1753     $data = array(
1754         'previous_page_url' => $previous_page_url,
1755         'next_page_url' => $next_page_url,
1756         'page_current' => $page,
1757         'page_max' => $pagecount,
1758         'result_count' => count($linksToDisplay),
1759         'search_term' => $searchterm,
1760         'search_tags' => $searchtags,
1761         'redirector' => empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'],  // Optional redirector URL.
1762         'token' => $token,
1763         'links' => $linkDisp,
1764         'tags' => $LINKSDB->allTags(),
1765     );
1766     // FIXME! temporary fix - see #399.
1767     if (!empty($GLOBALS['pagetitle']) && count($linkDisp) == 1) {
1768         $data['pagetitle'] = $GLOBALS['pagetitle'];
1769     }
1770
1771     $pluginManager = PluginManager::getInstance();
1772     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
1773
1774     foreach ($data as $key => $value) {
1775         $PAGE->assign($key, $value);
1776     }
1777
1778     return;
1779 }
1780
1781 // Compute the thumbnail for a link.
1782 //
1783 // With a link to the original URL.
1784 // Understands various services (youtube.com...)
1785 // Input: $url = URL for which the thumbnail must be found.
1786 //        $href = if provided, this URL will be followed instead of $url
1787 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1788 // Some of them may be missing.
1789 // Return an empty array if no thumbnail available.
1790 function computeThumbnail($url,$href=false)
1791 {
1792     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
1793     if ($href==false) $href=$url;
1794
1795     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1796     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1797     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1798     $domain = parse_url($url,PHP_URL_HOST);
1799     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1800     {
1801         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1802         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1803                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1804     }
1805     if ($domain=='youtu.be') // Youtube short links
1806     {
1807         $path = parse_url($url,PHP_URL_PATH);
1808         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1809                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1810     }
1811     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1812     {
1813         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1814         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1815                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1816     }
1817
1818     if ($domain=='imgur.com')
1819     {
1820         $path = parse_url($url,PHP_URL_PATH);
1821         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1822         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1823                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1824         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1825                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1826
1827         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1828                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1829     }
1830     if ($domain=='i.imgur.com')
1831     {
1832         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1833         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1834                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1835     }
1836     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1837     {
1838         if (strpos($url,'dailymotion.com/video/')!==false)
1839         {
1840             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1841             return array('src'=>$thumburl,
1842                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1843         }
1844     }
1845     if (endsWith($domain,'.imageshack.us'))
1846     {
1847         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1848         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1849         {
1850             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1851             return array('src'=>$thumburl,
1852                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1853         }
1854     }
1855
1856     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1857     // So we deport the thumbnail generation in order not to slow down page generation
1858     // (and we also cache the thumbnail)
1859
1860     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1861
1862     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1863         || $domain=='vimeo.com'
1864         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1865         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1866     )
1867     {
1868         if ($domain=='vimeo.com')
1869         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1870             $path = parse_url($url,PHP_URL_PATH);
1871             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1872         }
1873         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
1874         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
1875             $path = parse_url($url,PHP_URL_PATH);
1876             if (!preg_match('!/\d+.+?!',$path)) return array();
1877         }
1878         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
1879         {   // Make sure this TED URL points to a video (/talks/...)
1880             $path = parse_url($url,PHP_URL_PATH);
1881             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
1882         }
1883         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1884         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1885                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1886     }
1887
1888     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1889     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1890     // But using the extension will do.
1891     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1892     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1893     {
1894         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
1895         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1896                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1897     }
1898     return array(); // No thumbnail.
1899
1900 }
1901
1902
1903 // Returns the HTML code to display a thumbnail for a link
1904 // with a link to the original URL.
1905 // Understands various services (youtube.com...)
1906 // Input: $url = URL for which the thumbnail must be found.
1907 //        $href = if provided, this URL will be followed instead of $url
1908 // Returns '' if no thumbnail available.
1909 function thumbnail($url,$href=false)
1910 {
1911     $t = computeThumbnail($url,$href);
1912     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1913
1914     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
1915     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1916     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1917     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1918     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1919     $html.='></a>';
1920     return $html;
1921 }
1922
1923 // Returns the HTML code to display a thumbnail for a link
1924 // for the picture wall (using lazy image loading)
1925 // Understands various services (youtube.com...)
1926 // Input: $url = URL for which the thumbnail must be found.
1927 //        $href = if provided, this URL will be followed instead of $url
1928 // Returns '' if no thumbnail available.
1929 function lazyThumbnail($url,$href=false)
1930 {
1931     $t = computeThumbnail($url,$href);
1932     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1933
1934     $html='<a href="'.escape($t['href']).'">';
1935
1936     // Lazy image
1937     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
1938
1939     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1940     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1941     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1942     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1943     $html.='>';
1944
1945     // No-JavaScript fallback.
1946     $html.='<noscript><img src="'.escape($t['src']).'"';
1947     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1948     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1949     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1950     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1951     $html.='></noscript></a>';
1952
1953     return $html;
1954 }
1955
1956
1957 // -----------------------------------------------------------------------------------------------
1958 // Installation
1959 // This function should NEVER be called if the file data/config.php exists.
1960 function install()
1961 {
1962     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
1963     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
1964
1965
1966     // This part makes sure sessions works correctly.
1967     // (Because on some hosts, session.save_path may not be set correctly,
1968     // or we may not have write access to it.)
1969     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
1970     {   // Step 2: Check if data in session is correct.
1971         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
1972         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
1973         echo 'It currently points to '.session_save_path().'<br>';
1974         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
1975         echo '<br><a href="?">Click to try again.</a></pre>';
1976         die;
1977     }
1978     if (!isset($_SESSION['session_tested']))
1979     {   // Step 1 : Try to store data in session and reload page.
1980         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
1981         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
1982     }
1983     if (isset($_GET['test_session']))
1984     {   // Step 3: Sessions are OK. Remove test parameter from URL.
1985         header('Location: '.index_url($_SERVER));
1986     }
1987
1988
1989     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
1990     {
1991         $tz = 'UTC';
1992         if (!empty($_POST['continent']) && !empty($_POST['city'])
1993             && isTimeZoneValid($_POST['continent'], $_POST['city'])
1994         ) {
1995             $tz = $_POST['continent'].'/'.$_POST['city'];
1996         }
1997         $GLOBALS['timezone'] = $tz;
1998         // Everything is ok, let's create config file.
1999         $GLOBALS['login'] = $_POST['setlogin'];
2000         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2001         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2002         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(index_url($_SERVER)) : $_POST['title'] );
2003         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2004         try {
2005             writeConfig($GLOBALS, isLoggedIn());
2006         }
2007         catch(Exception $e) {
2008             error_log(
2009                     'ERROR while writing config file after installation.' . PHP_EOL .
2010                     $e->getMessage()
2011                 );
2012
2013             // TODO: do not handle exceptions/errors in JS.
2014             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2015             exit;
2016         }
2017         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2018         exit;
2019     }
2020
2021     // Display config form:
2022     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2023     $timezone_html = '';
2024     if ($timezone_form != '') {
2025         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2026     }
2027
2028     $PAGE = new PageBuilder();
2029     $PAGE->assign('timezone_html',$timezone_html);
2030     $PAGE->assign('timezone_js',$timezone_js);
2031     $PAGE->renderPage('install');
2032     exit;
2033 }
2034
2035 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2036    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2037    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2038    This function is called by passing the URL:
2039    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2040    [URL] is the URL of the link (e.g. a flickr page)
2041    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2042    The function below will fetch the image from the webservice and store it in the cache.
2043 */
2044 function genThumbnail()
2045 {
2046     // Make sure the parameters in the URL were generated by us.
2047     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2048     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2049
2050     // Let's see if we don't already have the image for this URL in the cache.
2051     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2052     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2053     {   // We have the thumbnail, just serve it:
2054         header('Content-Type: image/jpeg');
2055         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2056         return;
2057     }
2058     // We may also serve a blank image (if service did not respond)
2059     $blankname=hash('sha1',$_GET['url']).'.gif';
2060     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2061     {
2062         header('Content-Type: image/gif');
2063         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2064         return;
2065     }
2066
2067     // Otherwise, generate the thumbnail.
2068     $url = $_GET['url'];
2069     $domain = parse_url($url,PHP_URL_HOST);
2070
2071     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2072     {
2073         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2074         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2075
2076         // Is this a link to an image, or to a flickr page ?
2077         $imageurl='';
2078         if (endsWith(parse_url($url, PHP_URL_PATH), '.jpg'))
2079         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2080             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2081             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2082         }
2083         else // This is a flickr page (html)
2084         {
2085             // Get the flickr html page.
2086             list($headers, $content) = get_http_response($url, 20);
2087             if (strpos($headers[0], '200 OK') !== false)
2088             {
2089                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2090                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2091                 if (!empty($matches[1])) $imageurl=$matches[1];
2092
2093                 // In albums (and some other pages), the link rel="image_src" is not provided,
2094                 // but flickr provides:
2095                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2096                 if ($imageurl=='')
2097                 {
2098                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2099                     if (!empty($matches[1])) $imageurl=$matches[1];
2100                 }
2101             }
2102         }
2103
2104         if ($imageurl!='')
2105         {   // Let's download the image.
2106             // Image is 240x120, so 10 seconds to download should be enough.
2107             list($headers, $content) = get_http_response($imageurl, 10);
2108             if (strpos($headers[0], '200 OK') !== false) {
2109                 // Save image to cache.
2110                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/' . $thumbname, $content);
2111                 header('Content-Type: image/jpeg');
2112                 echo $content;
2113                 return;
2114             }
2115         }
2116     }
2117
2118     elseif ($domain=='vimeo.com' )
2119     {
2120         // This is more complex: we have to perform a HTTP request, then parse the result.
2121         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2122         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2123         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2124         if (strpos($headers[0], '200 OK') !== false) {
2125             $t = unserialize($content);
2126             $imageurl = $t[0]['thumbnail_medium'];
2127             // Then we download the image and serve it to our client.
2128             list($headers, $content) = get_http_response($imageurl, 10);
2129             if (strpos($headers[0], '200 OK') !== false) {
2130                 // Save image to cache.
2131                 file_put_contents($GLOBALS['config']['CACHEDIR'] . '/' . $thumbname, $content);
2132                 header('Content-Type: image/jpeg');
2133                 echo $content;
2134                 return;
2135             }
2136         }
2137     }
2138
2139     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2140     {
2141         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2142         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2143         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2144         list($headers, $content) = get_http_response($url, 5);
2145         if (strpos($headers[0], '200 OK') !== false) {
2146             // Extract the link to the thumbnail
2147             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2148             if (!empty($matches[1]))
2149             {   // Let's download the image.
2150                 $imageurl=$matches[1];
2151                 // No control on image size, so wait long enough
2152                 list($headers, $content) = get_http_response($imageurl, 20);
2153                 if (strpos($headers[0], '200 OK') !== false) {
2154                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2155                     file_put_contents($filepath, $content); // Save image to cache.
2156                     if (resizeImage($filepath))
2157                     {
2158                         header('Content-Type: image/jpeg');
2159                         echo file_get_contents($filepath);
2160                         return;
2161                     }
2162                 }
2163             }
2164         }
2165     }
2166
2167     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2168     {
2169         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2170         // http://xkcd.com/327/
2171         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2172         list($headers, $content) = get_http_response($url, 5);
2173         if (strpos($headers[0], '200 OK') !== false) {
2174             // Extract the link to the thumbnail
2175             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2176             if (!empty($matches[1]))
2177             {   // Let's download the image.
2178                 $imageurl=$matches[1];
2179                 // No control on image size, so wait long enough
2180                 list($headers, $content) = get_http_response($imageurl, 20);
2181                 if (strpos($headers[0], '200 OK') !== false) {
2182                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2183                     // Save image to cache.
2184                     file_put_contents($filepath, $content);
2185                     if (resizeImage($filepath))
2186                     {
2187                         header('Content-Type: image/jpeg');
2188                         echo file_get_contents($filepath);
2189                         return;
2190                     }
2191                 }
2192             }
2193         }
2194     }
2195
2196     else
2197     {
2198         // For all other domains, we try to download the image and make a thumbnail.
2199         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2200         list($headers, $content) = get_http_response($url, 30);
2201         if (strpos($headers[0], '200 OK') !== false) {
2202             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2203             // Save image to cache.
2204             file_put_contents($filepath, $content);
2205             if (resizeImage($filepath))
2206             {
2207                 header('Content-Type: image/jpeg');
2208                 echo file_get_contents($filepath);
2209                 return;
2210             }
2211         }
2212     }
2213
2214
2215     // Otherwise, return an empty image (8x8 transparent gif)
2216     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2217     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2218     header('Content-Type: image/gif');
2219     echo $blankgif;
2220 }
2221
2222 // Make a thumbnail of the image (to width: 120 pixels)
2223 // Returns true if success, false otherwise.
2224 function resizeImage($filepath)
2225 {
2226     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2227
2228     // Trick: some stupid people rename GIF as JPEG... or else.
2229     // So we really try to open each image type whatever the extension is.
2230     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2231     $im=false;
2232     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2233     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2234     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2235     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2236     $w = imagesx($im);
2237     $h = imagesy($im);
2238     $ystart = 0; $yheight=$h;
2239     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2240     $nw = 120;   // Desired width
2241     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2242     // Resize image:
2243     $im2 = imagecreatetruecolor($nw,$nh);
2244     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2245     imageinterlace($im2,true); // For progressive JPEG.
2246     $tempname=$filepath.'_TEMP.jpg';
2247     imagejpeg($im2, $tempname, 90);
2248     imagedestroy($im);
2249     imagedestroy($im2);
2250     unlink($filepath);
2251     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2252     return true;
2253 }
2254
2255 if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2256 if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=dailyrss')) { showDailyRSS(); exit; }
2257 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2258 renderPage();
2259 ?>