index.php

   1 <?php
   2 /**
   3  * Shaarli v0.6.5 - Shaare your links...
   4  *
   5  * The personal, minimalist, super-fast, no-database Delicious clone.
   6  *
   7  * Friendly fork by the Shaarli community:
   8  *  - https://github.com/shaarli/Shaarli
   9  *
  10  * Original project by sebsauvage.net:
  11  *  - http://sebsauvage.net/wiki/doku.php?id=php:shaarli
  12  *  - https://github.com/sebsauvage/Shaarli
  13  *
  14  * Licence: http://www.opensource.org/licenses/zlib-license.php
  15  *
  16  * Requires: PHP 5.3.x
  17  */
  18
  19 // Set 'UTC' as the default timezone if it is not defined in php.ini
  20 // See http://php.net/manual/en/datetime.configuration.php#ini.date.timezone
  21 if (date_default_timezone_get() == '') {
  22     date_default_timezone_set('UTC');
  23 }
  24
  25 /* -----------------------------------------------------------------------------
  26  * Hardcoded parameters
  27  * You should not touch any code below (or at your own risks!)
  28  * (These parameters can be overwritten by editing the file /data/config.php)
  29  * -----------------------------------------------------------------------------
  30  */
  31
  32 /*
  33  * Shaarli directories & configuration files
  34  */
  35 // Data subdirectory
  36 $GLOBALS['config']['DATADIR'] = 'data';
  37
  38 // Main configuration file
  39 $GLOBALS['config']['CONFIG_FILE'] = $GLOBALS['config']['DATADIR'].'/config.php';
  40
  41 // Link datastore
  42 $GLOBALS['config']['DATASTORE'] = $GLOBALS['config']['DATADIR'].'/datastore.php';
  43
  44 // Banned IPs
  45 $GLOBALS['config']['IPBANS_FILENAME'] = $GLOBALS['config']['DATADIR'].'/ipbans.php';
  46
  47 // Processed updates file.
  48 $GLOBALS['config']['UPDATES_FILE'] = $GLOBALS['config']['DATADIR'].'/updates.txt';
  49
  50 // Access log
  51 $GLOBALS['config']['LOG_FILE'] = $GLOBALS['config']['DATADIR'].'/log.txt';
  52
  53 // For updates check of Shaarli
  54 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt';
  55
  56 // Set ENABLE_UPDATECHECK to disabled by default.
  57 $GLOBALS['config']['ENABLE_UPDATECHECK'] = false;
  58
  59 // RainTPL cache directory (keep the trailing slash!)
  60 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp/';
  61 // Raintpl template directory (keep the trailing slash!)
  62 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/';
  63
  64 // Thumbnail cache directory
  65 $GLOBALS['config']['CACHEDIR'] = 'cache';
  66
  67 // Atom & RSS feed cache directory
  68 $GLOBALS['config']['PAGECACHE'] = 'pagecache';
  69
  70 /*
  71  * Global configuration
  72  */
  73 // Ban IP after this many failures
  74 $GLOBALS['config']['BAN_AFTER'] = 4;
  75 // Ban duration for IP address after login failures (in seconds)
  76 $GLOBALS['config']['BAN_DURATION'] = 1800;
  77
  78 // Feed options
  79 // Enable RSS permalinks by default.
  80 // This corresponds to the default behavior of shaarli before this was added as an option.
  81 $GLOBALS['config']['ENABLE_RSS_PERMALINKS'] = true;
  82 // If true, an extra "ATOM feed" button will be displayed in the toolbar
  83 $GLOBALS['config']['SHOW_ATOM'] = false;
  84
  85 // Link display options
  86 $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = false;
  87 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false;
  88 $GLOBALS['config']['LINKS_PER_PAGE'] = 20;
  89
  90 // Open Shaarli (true): anyone can add/edit/delete links without having to login
  91 $GLOBALS['config']['OPEN_SHAARLI'] = false;
  92
  93 // Thumbnails
  94 // Display thumbnails in links
  95 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true;
  96 // Store thumbnails in a local cache
  97 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true;
  98
  99 // Update check frequency for Shaarli. 86400 seconds=24 hours
 100 $GLOBALS['config']['UPDATECHECK_BRANCH'] = 'stable';
 101 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400;
 102
 103
 104 /*
 105  * Plugin configuration
 106  *
 107  * Warning: order matters!
 108  *
 109  * These settings may be be overriden in:
 110  *  - data/config.php
 111  *  - each plugin's configuration file
 112  */
 113 //$GLOBALS['config']['ENABLED_PLUGINS'] = array(
 114 //    'qrcode', 'archiveorg', 'readityourself', 'demo_plugin', 'playvideos',
 115 //    'wallabag', 'markdown', 'addlink_toolbar',
 116 //);
 117 $GLOBALS['config']['ENABLED_PLUGINS'] = array('qrcode');
 118
 119 // Initialize plugin parameters array.
 120 $GLOBALS['plugins'] = array();
 121
 122 // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
 123 $GLOBALS['config']['PUBSUBHUB_URL'] = '';
 124
 125 /*
 126  * PHP configuration
 127  */
 128 define('shaarli_version', '0.6.5');
 129
 130 // http://server.com/x/shaarli --> /shaarli/
 131 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
 132
 133 // High execution time in case of problematic imports/exports.
 134 ini_set('max_input_time','60');
 135
 136 // Try to set max upload file size and read
 137 ini_set('memory_limit', '128M');
 138 ini_set('post_max_size', '16M');
 139 ini_set('upload_max_filesize', '16M');
 140
 141 // See all error except warnings
 142 error_reporting(E_ALL^E_WARNING);
 143 // See all errors (for debugging only)
 144 //error_reporting(-1);
 145
 146 /*
 147  * User configuration
 148  */
 149 if (is_file($GLOBALS['config']['CONFIG_FILE'])) {
 150     require_once $GLOBALS['config']['CONFIG_FILE'];
 151 }
 152
 153 // Shaarli library
 154 require_once 'application/ApplicationUtils.php';
 155 require_once 'application/Cache.php';
 156 require_once 'application/CachedPage.php';
 157 require_once 'application/FeedBuilder.php';
 158 require_once 'application/FileUtils.php';
 159 require_once 'application/HttpUtils.php';
 160 require_once 'application/LinkDB.php';
 161 require_once 'application/LinkFilter.php';
 162 require_once 'application/LinkUtils.php';
 163 require_once 'application/TimeZone.php';
 164 require_once 'application/Url.php';
 165 require_once 'application/Utils.php';
 166 require_once 'application/Config.php';
 167 require_once 'application/PluginManager.php';
 168 require_once 'application/Router.php';
 169 require_once 'application/Updater.php';
 170
 171 // Ensure the PHP version is supported
 172 try {
 173     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
 174 } catch(Exception $exc) {
 175     header('Content-Type: text/plain; charset=utf-8');
 176     echo $exc->getMessage();
 177     exit;
 178 }
 179
 180 // Force cookie path (but do not change lifetime)
 181 $cookie = session_get_cookie_params();
 182 $cookiedir = '';
 183 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
 184     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
 185 }
 186 // Set default cookie expiration and path.
 187 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 188 // Set session parameters on server side.
 189 // If the user does not access any page within this time, his/her session is considered expired.
 190 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 191 // Use cookies to store session.
 192 ini_set('session.use_cookies', 1);
 193 // Force cookies for session (phpsessionID forbidden in URL).
 194 ini_set('session.use_only_cookies', 1);
 195 // Prevent PHP form using sessionID in URL if cookies are disabled.
 196 ini_set('session.use_trans_sid', false);
 197
 198 session_name('shaarli');
 199 // Start session if needed (Some server auto-start sessions).
 200 if (session_id() == '') {
 201     session_start();
 202 }
 203
 204 // Regenerate session ID if invalid or not defined in cookie.
 205 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 206     session_regenerate_id(true);
 207     $_COOKIE['shaarli'] = session_id();
 208 }
 209
 210 include "inc/rain.tpl.class.php"; //include Rain TPL
 211 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
 212 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
 213
 214 $pluginManager = PluginManager::getInstance();
 215 $pluginManager->load($GLOBALS['config']['ENABLED_PLUGINS']);
 216
 217 ob_start();  // Output buffering for the page cache.
 218
 219
 220 // In case stupid admin has left magic_quotes enabled in php.ini:
 221 if (get_magic_quotes_gpc())
 222 {
 223     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 224     $_POST = array_map('stripslashes_deep', $_POST);
 225     $_GET = array_map('stripslashes_deep', $_GET);
 226     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 227 }
 228
 229 // Prevent caching on client side or proxy: (yes, it's ugly)
 230 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 231 header("Cache-Control: no-store, no-cache, must-revalidate");
 232 header("Cache-Control: post-check=0, pre-check=0", false);
 233 header("Pragma: no-cache");
 234
 235 // Handling of old config file which do not have the new parameters.
 236 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(index_url($_SERVER));
 237 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 238 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 239 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 240 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 241 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 242 // I really need to rewrite Shaarli with a proper configuation manager.
 243
 244 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 245     // Ensure Shaarli has proper access to its resources
 246     $errors = ApplicationUtils::checkResourcePermissions($GLOBALS['config']);
 247
 248     if ($errors != array()) {
 249         $message = '<p>Insufficient permissions:</p><ul>';
 250
 251         foreach ($errors as $error) {
 252             $message .= '<li>'.$error.'</li>';
 253         }
 254         $message .= '</ul>';
 255
 256         header('Content-Type: text/html; charset=utf-8');
 257         echo $message;
 258         exit;
 259     }
 260
 261     // Display the installation form if no existing config is found
 262     install();
 263 }
 264
 265 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 266 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 267 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 268
 269 // a token depending of deployment salt, user password, and the current ip
 270 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 271
 272 // Sniff browser language and set date format accordingly.
 273 if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
 274     autoLocale($_SERVER['HTTP_ACCEPT_LANGUAGE']);
 275 }
 276 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 277
 278 //==================================================================================================
 279 // Checking session state (i.e. is the user still logged in)
 280 //==================================================================================================
 281
 282 function setup_login_state() {
 283         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 284             return true;
 285         }
 286         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 287         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 288         if (!isset($GLOBALS['login'])) {
 289             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 290             $loginFailure = true;
 291         }
 292         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 293             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 294             !$loginFailure)
 295         {
 296             fillSessionInfo();
 297             $userIsLoggedIn = true;
 298         }
 299         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 300         if (empty($_SESSION['uid']) ||
 301             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 302             time() >= $_SESSION['expires_on'])
 303         {
 304             logout();
 305             $userIsLoggedIn = false;
 306             $loginFailure = true;
 307         }
 308         if (!empty($_SESSION['longlastingsession'])) {
 309             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 310         }
 311         else {
 312             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 313         }
 314         if (!$loginFailure) {
 315             $userIsLoggedIn = true;
 316         }
 317
 318         return $userIsLoggedIn;
 319 }
 320 $userIsLoggedIn = setup_login_state();
 321
 322 // ------------------------------------------------------------------------------------------
 323 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 324 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 325 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 326 function pubsubhub()
 327 {
 328     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 329     {
 330        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 331        $topic_url = array (
 332                        index_url($_SERVER).'?do=atom',
 333                        index_url($_SERVER).'?do=rss'
 334                     );
 335        $p->publish_update($topic_url);
 336     }
 337 }
 338
 339 // ------------------------------------------------------------------------------------------
 340 // Session management
 341
 342 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 343 function allIPs()
 344 {
 345     $ip = $_SERVER["REMOTE_ADDR"];
 346     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 347     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 348     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 349     return $ip;
 350 }
 351
 352 function fillSessionInfo() {
 353         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 354         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 355         $_SESSION['username']=$GLOBALS['login'];
 356         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 357 }
 358
 359 // Check that user/password is correct.
 360 function check_auth($login,$password)
 361 {
 362     $hash = sha1($password.$login.$GLOBALS['salt']);
 363     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 364     {   // Login/password is correct.
 365                 fillSessionInfo();
 366         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login successful');
 367         return True;
 368     }
 369     logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login failed for user '.$login);
 370     return False;
 371 }
 372
 373 // Returns true if the user is logged in.
 374 function isLoggedIn()
 375 {
 376     global $userIsLoggedIn;
 377     return $userIsLoggedIn;
 378 }
 379
 380 // Force logout.
 381 function logout() {
 382     if (isset($_SESSION)) {
 383         unset($_SESSION['uid']);
 384         unset($_SESSION['ip']);
 385         unset($_SESSION['username']);
 386         unset($_SESSION['privateonly']);
 387     }
 388     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 389 }
 390
 391
 392 // ------------------------------------------------------------------------------------------
 393 // Brute force protection system
 394 // Several consecutive failed logins will ban the IP address for 30 minutes.
 395 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?>");
 396 include $GLOBALS['config']['IPBANS_FILENAME'];
 397 // Signal a failed login. Will ban the IP if too many failures:
 398 function ban_loginFailed()
 399 {
 400     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 401     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 402     $gb['FAILURES'][$ip]++;
 403     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 404     {
 405         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 406         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'IP address banned from login');
 407     }
 408     $GLOBALS['IPBANS'] = $gb;
 409     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 410 }
 411
 412 // Signals a successful login. Resets failed login counter.
 413 function ban_loginOk()
 414 {
 415     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 416     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 417     $GLOBALS['IPBANS'] = $gb;
 418     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 419 }
 420
 421 // Checks if the user CAN login. If 'true', the user can try to login.
 422 function ban_canLogin()
 423 {
 424     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 425     if (isset($gb['BANS'][$ip]))
 426     {
 427         // User is banned. Check if the ban has expired:
 428         if ($gb['BANS'][$ip]<=time())
 429         {   // Ban expired, user can try to login again.
 430             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Ban lifted.');
 431             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 432             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 433             return true; // Ban has expired, user can login.
 434         }
 435         return false; // User is banned.
 436     }
 437     return true; // User is not banned.
 438 }
 439
 440 // ------------------------------------------------------------------------------------------
 441 // Process login form: Check if login/password is correct.
 442 if (isset($_POST['login']))
 443 {
 444     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 445     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 446     {   // Login/password is OK.
 447         ban_loginOk();
 448         // If user wants to keep the session cookie even after the browser closes:
 449         if (!empty($_POST['longlastingsession']))
 450         {
 451                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 452             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 453             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 454
 455             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 456             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 457             // Note: Never forget the trailing slash on the cookie path!
 458             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 459         }
 460         else // Standard session expiration (=when browser closes)
 461         {
 462             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 463             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 464             session_regenerate_id(true);
 465         }
 466
 467         // Optional redirect after login:
 468         if (isset($_GET['post'])) {
 469             $uri = '?post='. urlencode($_GET['post']);
 470             foreach (array('description', 'source', 'title') as $param) {
 471                 if (!empty($_GET[$param])) {
 472                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 473                 }
 474             }
 475             header('Location: '. $uri);
 476             exit;
 477         }
 478
 479         if (isset($_GET['edit_link'])) {
 480             header('Location: ?edit_link='. escape($_GET['edit_link']));
 481             exit;
 482         }
 483
 484         if (isset($_POST['returnurl'])) {
 485             // Prevent loops over login screen.
 486             if (strpos($_POST['returnurl'], 'do=login') === false) {
 487                 header('Location: '. escape($_POST['returnurl']));
 488                 exit;
 489             }
 490         }
 491         header('Location: ?'); exit;
 492     }
 493     else
 494     {
 495         ban_loginFailed();
 496         $redir = '';
 497         if (isset($_GET['post'])) {
 498             $redir = '?post=' . urlencode($_GET['post']);
 499             foreach (array('description', 'source', 'title') as $param) {
 500                 if (!empty($_GET[$param])) {
 501                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 502                 }
 503             }
 504         }
 505         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 506         exit;
 507     }
 508 }
 509
 510 // ------------------------------------------------------------------------------------------
 511 // Misc utility functions:
 512
 513 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 514 function return_bytes($val)
 515 {
 516     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 517     switch($last)
 518     {
 519         case 'g': $val *= 1024;
 520         case 'm': $val *= 1024;
 521         case 'k': $val *= 1024;
 522     }
 523     return $val;
 524 }
 525
 526 // Try to determine max file size for uploads (POST).
 527 // Returns an integer (in bytes)
 528 function getMaxFileSize()
 529 {
 530     $size1 = return_bytes(ini_get('post_max_size'));
 531     $size2 = return_bytes(ini_get('upload_max_filesize'));
 532     // Return the smaller of two:
 533     $maxsize = min($size1,$size2);
 534     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 535     return $maxsize;
 536 }
 537
 538 // ------------------------------------------------------------------------------------------
 539 // Token management for XSRF protection
 540 // Token should be used in any form which acts on data (create,update,delete,import...).
 541 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 542
 543 // Returns a token.
 544 function getToken()
 545 {
 546     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 547     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 548     return $rnd;
 549 }
 550
 551 // Tells if a token is OK. Using this function will destroy the token.
 552 // true=token is OK.
 553 function tokenOk($token)
 554 {
 555     if (isset($_SESSION['tokens'][$token]))
 556     {
 557         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 558         return true; // Token is OK.
 559     }
 560     return false; // Wrong token, or already used.
 561 }
 562
 563 // ------------------------------------------------------------------------------------------
 564 /* This class is in charge of building the final page.
 565    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 566    p = new pageBuilder;
 567    p.assign('myfield','myvalue');
 568    p.renderPage('mytemplate');
 569
 570 */
 571 class pageBuilder
 572 {
 573     private $tpl; // RainTPL template
 574
 575     function __construct()
 576     {
 577         $this->tpl = false;
 578     }
 579
 580     /**
 581      * Initialize all default tpl tags.
 582      */
 583     private function initialize()
 584     {
 585         $this->tpl = new RainTPL;
 586
 587         try {
 588             $version = ApplicationUtils::checkUpdate(
 589                 shaarli_version,
 590                 $GLOBALS['config']['UPDATECHECK_FILENAME'],
 591                 $GLOBALS['config']['UPDATECHECK_INTERVAL'],
 592                 $GLOBALS['config']['ENABLE_UPDATECHECK'],
 593                 isLoggedIn(),
 594                 $GLOBALS['config']['UPDATECHECK_BRANCH']
 595             );
 596             $this->tpl->assign('newVersion', escape($version));
 597             $this->tpl->assign('versionError', '');
 598
 599         } catch (Exception $exc) {
 600             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], $exc->getMessage());
 601             $this->tpl->assign('newVersion', '');
 602             $this->tpl->assign('versionError', escape($exc->getMessage()));
 603         }
 604
 605         $this->tpl->assign('feedurl', escape(index_url($_SERVER)));
 606         $searchcrits = ''; // Search criteria
 607         if (!empty($_GET['searchtags'])) {
 608             $searchcrits .= '&searchtags=' . urlencode($_GET['searchtags']);
 609         }
 610         if (!empty($_GET['searchterm'])) {
 611             $searchcrits .= '&searchterm=' . urlencode($_GET['searchterm']);
 612         }
 613         $this->tpl->assign('searchcrits', $searchcrits);
 614         $this->tpl->assign('source', index_url($_SERVER));
 615         $this->tpl->assign('version', shaarli_version);
 616         $this->tpl->assign('scripturl', index_url($_SERVER));
 617         $this->tpl->assign('pagetitle', 'Shaarli');
 618         $this->tpl->assign('privateonly', !empty($_SESSION['privateonly'])); // Show only private links?
 619         if (!empty($GLOBALS['title'])) {
 620             $this->tpl->assign('pagetitle', $GLOBALS['title']);
 621         }
 622         if (!empty($GLOBALS['titleLink'])) {
 623             $this->tpl->assign('titleLink', $GLOBALS['titleLink']);
 624         }
 625         if (!empty($GLOBALS['pagetitle'])) {
 626             $this->tpl->assign('pagetitle', $GLOBALS['pagetitle']);
 627         }
 628         $this->tpl->assign('shaarlititle', empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title']);
 629         if (!empty($GLOBALS['plugin_errors'])) {
 630             $this->tpl->assign('plugin_errors', $GLOBALS['plugin_errors']);
 631         }
 632     }
 633
 634     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 635     public function assign($what,$where)
 636     {
 637         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 638         $this->tpl->assign($what,$where);
 639     }
 640
 641     /**
 642      * Assign an array of data to the template builder.
 643      *
 644      * @param array $data Data to assign.
 645      *
 646      * @return false if invalid data.
 647      */
 648     public function assignAll($data)
 649     {
 650         // Lazy initialization
 651         if ($this->tpl === false) {
 652             $this->initialize();
 653         }
 654
 655         if (empty($data) || !is_array($data)){
 656             return false;
 657         }
 658
 659         foreach ($data as $key => $value) {
 660             $this->assign($key, $value);
 661         }
 662     }
 663
 664     // Render a specific page (using a template).
 665     // e.g. pb.renderPage('picwall')
 666     public function renderPage($page)
 667     {
 668         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 669         $this->tpl->draw($page);
 670     }
 671
 672     /**
 673     * Render a 404 page (uses the template : tpl/404.tpl)
 674     *
 675     * usage : $PAGE->render404('The link was deleted')
 676     * @param string $message A messate to display what is not found
 677     */
 678     public function render404($message='The page you are trying to reach does not exist or has been deleted.') {
 679         header($_SERVER['SERVER_PROTOCOL'] . ' 404 Not Found');
 680         $this->tpl->assign('error_message', $message);
 681         $this->renderPage('404');
 682     }
 683 }
 684
 685 // ------------------------------------------------------------------------------------------
 686 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 687 // Gives the last 7 days (which have links).
 688 // This RSS feed cannot be filtered.
 689 function showDailyRSS() {
 690     // Cache system
 691     $query = $_SERVER["QUERY_STRING"];
 692     $cache = new CachedPage(
 693         $GLOBALS['config']['PAGECACHE'],
 694         page_url($_SERVER),
 695         startsWith($query,'do=dailyrss') && !isLoggedIn()
 696     );
 697     $cached = $cache->cachedVersion();
 698     if (!empty($cached)) {
 699         echo $cached;
 700         exit;
 701     }
 702
 703     // If cached was not found (or not usable), then read the database and build the response:
 704     // Read links from database (and filter private links if used it not logged in).
 705     $LINKSDB = new LinkDB(
 706         $GLOBALS['config']['DATASTORE'],
 707         isLoggedIn(),
 708         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 709         $GLOBALS['redirector']
 710     );
 711
 712     /* Some Shaarlies may have very few links, so we need to look
 713        back in time (rsort()) until we have enough days ($nb_of_days).
 714     */
 715     $linkdates = array();
 716     foreach ($LINKSDB as $linkdate => $value) {
 717         $linkdates[] = $linkdate;
 718     }
 719     rsort($linkdates);
 720     $nb_of_days = 7; // We take 7 days.
 721     $today = Date('Ymd');
 722     $days = array();
 723
 724     foreach ($linkdates as $linkdate) {
 725         $day = substr($linkdate, 0, 8); // Extract day (without time)
 726         if (strcmp($day,$today) < 0) {
 727             if (empty($days[$day])) {
 728                 $days[$day] = array();
 729             }
 730             $days[$day][] = $linkdate;
 731         }
 732
 733         if (count($days) > $nb_of_days) {
 734             break; // Have we collected enough days?
 735         }
 736     }
 737
 738     // Build the RSS feed.
 739     header('Content-Type: application/rss+xml; charset=utf-8');
 740     $pageaddr = escape(index_url($_SERVER));
 741     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 742     echo '<channel>';
 743     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 744     echo '<link>'. $pageaddr .'</link>';
 745     echo '<description>Daily shared links</description>';
 746     echo '<language>en-en</language>';
 747     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 748
 749     // For each day.
 750     foreach ($days as $day => $linkdates) {
 751         $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 752         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 753
 754         // Build the HTML body of this RSS entry.
 755         $html = '';
 756         $href = '';
 757         $links = array();
 758
 759         // We pre-format some fields for proper output.
 760         foreach ($linkdates as $linkdate) {
 761             $l = $LINKSDB[$linkdate];
 762             $l['formatedDescription'] = format_description($l['description'], $GLOBALS['redirector']);
 763             $l['thumbnail'] = thumbnail($l['url']);
 764             $l_date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $l['linkdate']);
 765             $l['timestamp'] = $l_date->getTimestamp();
 766             if (startsWith($l['url'], '?')) {
 767                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 768             }
 769             $links[$linkdate] = $l;
 770         }
 771
 772         // Then build the HTML for this day:
 773         $tpl = new RainTPL;
 774         $tpl->assign('title', $GLOBALS['title']);
 775         $tpl->assign('daydate', $dayDate->getTimestamp());
 776         $tpl->assign('absurl', $absurl);
 777         $tpl->assign('links', $links);
 778         $tpl->assign('rssdate', escape($dayDate->format(DateTime::RSS)));
 779         $html = $tpl->draw('dailyrss', $return_string=true);
 780
 781         echo $html . PHP_EOL;
 782     }
 783     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
 784
 785     $cache->cache(ob_get_contents());
 786     ob_end_flush();
 787     exit;
 788 }
 789
 790 /**
 791  * Show the 'Daily' page.
 792  *
 793  * @param PageBuilder $pageBuilder Template engine wrapper.
 794  */
 795 function showDaily($pageBuilder)
 796 {
 797     $LINKSDB = new LinkDB(
 798         $GLOBALS['config']['DATASTORE'],
 799         isLoggedIn(),
 800         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 801         $GLOBALS['redirector']
 802     );
 803
 804     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 805     if (isset($_GET['day'])) $day=$_GET['day'];
 806
 807     $days = $LINKSDB->days();
 808     $i = array_search($day,$days);
 809     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
 810     $previousday='';
 811     $nextday='';
 812     if ($i!==false)
 813     {
 814         if ($i>=1) $previousday=$days[$i-1];
 815         if ($i<count($days)-1) $nextday=$days[$i+1];
 816     }
 817
 818     try {
 819         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_DAY, $day);
 820     } catch (Exception $exc) {
 821         error_log($exc);
 822         $linksToDisplay = array();
 823     }
 824
 825     // We pre-format some fields for proper output.
 826     foreach($linksToDisplay as $key=>$link)
 827     {
 828
 829         $taglist = explode(' ',$link['tags']);
 830         uasort($taglist, 'strcasecmp');
 831         $linksToDisplay[$key]['taglist']=$taglist;
 832         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $GLOBALS['redirector']);
 833         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
 834         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
 835         $linksToDisplay[$key]['timestamp'] = $date->getTimestamp();
 836     }
 837
 838     /* We need to spread the articles on 3 columns.
 839        I did not want to use a JavaScript lib like http://masonry.desandro.com/
 840        so I manually spread entries with a simple method: I roughly evaluate the
 841        height of a div according to title and description length.
 842     */
 843     $columns=array(array(),array(),array()); // Entries to display, for each column.
 844     $fill=array(0,0,0);  // Rough estimate of columns fill.
 845     foreach($linksToDisplay as $key=>$link)
 846     {
 847         // Roughly estimate length of entry (by counting characters)
 848         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
 849         // Description: 836 characters gives roughly 342 pixel height.
 850         // This is not perfect, but it's usually OK.
 851         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
 852         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
 853         // Then put in column which is the less filled:
 854         $smallest=min($fill); // find smallest value in array.
 855         $index=array_search($smallest,$fill); // find index of this smallest value.
 856         array_push($columns[$index],$link); // Put entry in this column.
 857         $fill[$index]+=$length;
 858     }
 859
 860     $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 861     $data = array(
 862         'linksToDisplay' => $linksToDisplay,
 863         'linkcount' => count($LINKSDB),
 864         'cols' => $columns,
 865         'day' => $dayDate->getTimestamp(),
 866         'previousday' => $previousday,
 867         'nextday' => $nextday,
 868     );
 869     $pluginManager = PluginManager::getInstance();
 870     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
 871
 872     foreach ($data as $key => $value) {
 873         $pageBuilder->assign($key, $value);
 874     }
 875
 876     $pageBuilder->renderPage('daily');
 877     exit;
 878 }
 879
 880 // Renders the linklist
 881 function showLinkList($PAGE, $LINKSDB) {
 882     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
 883     $PAGE->renderPage('linklist');
 884 }
 885
 886
 887 // ------------------------------------------------------------------------------------------
 888 // Render HTML page (according to URL parameters and user rights)
 889 function renderPage()
 890 {
 891     $LINKSDB = new LinkDB(
 892         $GLOBALS['config']['DATASTORE'],
 893         isLoggedIn(),
 894         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 895         $GLOBALS['redirector']
 896     );
 897
 898     $updater = new Updater(
 899         read_updates_file($GLOBALS['config']['UPDATES_FILE']),
 900         $GLOBALS,
 901         $LINKSDB,
 902         isLoggedIn()
 903     );
 904     try {
 905         $newUpdates = $updater->update();
 906         if (! empty($newUpdates)) {
 907             write_updates_file(
 908                 $GLOBALS['config']['UPDATES_FILE'],
 909                 $updater->getDoneUpdates()
 910             );
 911         }
 912     }
 913     catch(Exception $e) {
 914         die($e->getMessage());
 915     }
 916
 917     $PAGE = new pageBuilder;
 918
 919     // Determine which page will be rendered.
 920     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
 921     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
 922
 923     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
 924     // Then assign generated data to RainTPL.
 925     $common_hooks = array(
 926         'includes',
 927         'header',
 928         'footer',
 929     );
 930     $pluginManager = PluginManager::getInstance();
 931     foreach($common_hooks as $name) {
 932         $plugin_data = array();
 933         $pluginManager->executeHooks('render_' . $name, $plugin_data,
 934             array(
 935                 'target' => $targetPage,
 936                 'loggedin' => isLoggedIn()
 937             )
 938         );
 939         $PAGE->assign('plugins_' . $name, $plugin_data);
 940     }
 941
 942     // -------- Display login form.
 943     if ($targetPage == Router::$PAGE_LOGIN)
 944     {
 945         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
 946         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
 947         $PAGE->assign('token',$token);
 948         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
 949         $PAGE->renderPage('loginform');
 950         exit;
 951     }
 952     // -------- User wants to logout.
 953     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
 954     {
 955         invalidateCaches($GLOBALS['config']['PAGECACHE']);
 956         logout();
 957         header('Location: ?');
 958         exit;
 959     }
 960
 961     // -------- Picture wall
 962     if ($targetPage == Router::$PAGE_PICWALL)
 963     {
 964         // Optionally filter the results:
 965         $searchtags = !empty($_GET['searchtags']) ? escape($_GET['searchtags']) : '';
 966         $searchterm = !empty($_GET['searchterm']) ? escape($_GET['searchterm']) : '';
 967         if (! empty($searchtags) && ! empty($searchterm)) {
 968             $links = $LINKSDB->filter(
 969                 LinkFilter::$FILTER_TAG | LinkFilter::$FILTER_TEXT,
 970                 array($searchtags, $searchterm)
 971             );
 972         }
 973         elseif ($searchtags) {
 974             $links = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $searchtags);
 975         }
 976         elseif ($searchterm) {
 977             $links = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $searchterm);
 978         }
 979         else {
 980             $links = $LINKSDB;
 981         }
 982
 983         $linksToDisplay = array();
 984
 985         // Get only links which have a thumbnail.
 986         foreach($links as $link)
 987         {
 988             $permalink='?'.escape(smallhash($link['linkdate']));
 989             $thumb=lazyThumbnail($link['url'],$permalink);
 990             if ($thumb!='') // Only output links which have a thumbnail.
 991             {
 992                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
 993                 $linksToDisplay[]=$link; // Add to array.
 994             }
 995         }
 996
 997         $data = array(
 998             'linkcount' => count($LINKSDB),
 999             'linksToDisplay' => $linksToDisplay,
1000         );
1001         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
1002
1003         foreach ($data as $key => $value) {
1004             $PAGE->assign($key, $value);
1005         }
1006
1007         $PAGE->renderPage('picwall');
1008         exit;
1009     }
1010
1011     // -------- Tag cloud
1012     if ($targetPage == Router::$PAGE_TAGCLOUD)
1013     {
1014         $tags= $LINKSDB->allTags();
1015
1016         // We sort tags alphabetically, then choose a font size according to count.
1017         // First, find max value.
1018         $maxcount = 0;
1019         foreach ($tags as $value) {
1020             $maxcount = max($maxcount, $value);
1021         }
1022
1023         // Sort tags alphabetically: case insensitive, support locale if avalaible.
1024         uksort($tags, function($a, $b) {
1025             // Collator is part of PHP intl.
1026             if (class_exists('Collator')) {
1027                 $c = new Collator(setlocale(LC_COLLATE, 0));
1028                 if (!intl_is_failure(intl_get_error_code())) {
1029                     return $c->compare($a, $b);
1030                 }
1031             }
1032             return strcasecmp($a, $b);
1033         });
1034
1035         $tagList=array();
1036         foreach($tags as $key=>$value)
1037         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1038         {
1039             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1040         }
1041
1042         $data = array(
1043             'linkcount' => count($LINKSDB),
1044             'tags' => $tagList,
1045         );
1046         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
1047
1048         foreach ($data as $key => $value) {
1049             $PAGE->assign($key, $value);
1050         }
1051
1052         $PAGE->renderPage('tagcloud');
1053         exit;
1054     }
1055
1056     // Daily page.
1057     if ($targetPage == Router::$PAGE_DAILY) {
1058         showDaily($PAGE);
1059     }
1060
1061     // ATOM and RSS feed.
1062     if ($targetPage == Router::$PAGE_FEED_ATOM || $targetPage == Router::$PAGE_FEED_RSS) {
1063         $feedType = $targetPage == Router::$PAGE_FEED_RSS ? FeedBuilder::$FEED_RSS : FeedBuilder::$FEED_ATOM;
1064         header('Content-Type: application/'. $feedType .'+xml; charset=utf-8');
1065
1066         // Cache system
1067         $query = $_SERVER['QUERY_STRING'];
1068         $cache = new CachedPage(
1069             $GLOBALS['config']['PAGECACHE'],
1070             page_url($_SERVER),
1071             startsWith($query,'do='. $targetPage) && !isLoggedIn()
1072         );
1073         $cached = $cache->cachedVersion();
1074         if (!empty($cached)) {
1075             echo $cached;
1076             exit;
1077         }
1078
1079         // Generate data.
1080         $feedGenerator = new FeedBuilder($LINKSDB, $feedType, $_SERVER, $_GET, isLoggedIn());
1081         $feedGenerator->setLocale(strtolower(setlocale(LC_COLLATE, 0)));
1082         $feedGenerator->setHideDates($GLOBALS['config']['HIDE_TIMESTAMPS'] && !isLoggedIn());
1083         $feedGenerator->setUsePermalinks(isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS']);
1084         if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) {
1085             $feedGenerator->setPubsubhubUrl($GLOBALS['config']['PUBSUBHUB_URL']);
1086         }
1087         $data = $feedGenerator->buildData();
1088
1089         // Process plugin hook.
1090         $pluginManager = PluginManager::getInstance();
1091         $pluginManager->executeHooks('render_feed', $data, array(
1092             'loggedin' => isLoggedIn(),
1093             'target' => $targetPage,
1094         ));
1095
1096         // Render the template.
1097         $PAGE->assignAll($data);
1098         $PAGE->renderPage('feed.'. $feedType);
1099         $cache->cache(ob_get_contents());
1100         ob_end_flush();
1101         exit;
1102     }
1103
1104     // Display openseach plugin (XML)
1105     if ($targetPage == Router::$PAGE_OPENSEARCH) {
1106         header('Content-Type: application/xml; charset=utf-8');
1107         $PAGE->assign('serverurl', index_url($_SERVER));
1108         $PAGE->renderPage('opensearch');
1109         exit;
1110     }
1111
1112     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1113     if (isset($_GET['addtag']))
1114     {
1115         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1116         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1117         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1118
1119         // Prevent redirection loop
1120         if (isset($params['addtag'])) {
1121             unset($params['addtag']);
1122         }
1123
1124         // Check if this tag is already in the search query and ignore it if it is.
1125         // Each tag is always separated by a space
1126         if (isset($params['searchtags'])) {
1127             $current_tags = explode(' ', $params['searchtags']);
1128         } else {
1129             $current_tags = array();
1130         }
1131         $addtag = true;
1132         foreach ($current_tags as $value) {
1133             if ($value === $_GET['addtag']) {
1134                 $addtag = false;
1135                 break;
1136             }
1137         }
1138         // Append the tag if necessary
1139         if (empty($params['searchtags'])) {
1140             $params['searchtags'] = trim($_GET['addtag']);
1141         }
1142         else if ($addtag) {
1143             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1144         }
1145
1146         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1147         header('Location: ?'.http_build_query($params));
1148         exit;
1149     }
1150
1151     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1152     if (isset($_GET['removetag'])) {
1153         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1154         if (empty($_SERVER['HTTP_REFERER'])) {
1155             header('Location: ?');
1156             exit;
1157         }
1158
1159         // In case browser does not send HTTP_REFERER
1160         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1161
1162         // Prevent redirection loop
1163         if (isset($params['removetag'])) {
1164             unset($params['removetag']);
1165         }
1166
1167         if (isset($params['searchtags'])) {
1168             $tags = explode(' ', $params['searchtags']);
1169             // Remove value from array $tags.
1170             $tags = array_diff($tags, array($_GET['removetag']));
1171             $params['searchtags'] = implode(' ',$tags);
1172
1173             if (empty($params['searchtags'])) {
1174                 unset($params['searchtags']);
1175             }
1176
1177             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1178         }
1179         header('Location: ?'.http_build_query($params));
1180         exit;
1181     }
1182
1183     // -------- User wants to change the number of links per page (linksperpage=...)
1184     if (isset($_GET['linksperpage'])) {
1185         if (is_numeric($_GET['linksperpage'])) {
1186             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1187         }
1188
1189         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1190         exit;
1191     }
1192
1193     // -------- User wants to see only private links (toggle)
1194     if (isset($_GET['privateonly'])) {
1195         if (empty($_SESSION['privateonly'])) {
1196             $_SESSION['privateonly'] = 1; // See only private links
1197         } else {
1198             unset($_SESSION['privateonly']); // See all links
1199         }
1200
1201         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1202         exit;
1203     }
1204
1205     // -------- Handle other actions allowed for non-logged in users:
1206     if (!isLoggedIn())
1207     {
1208         // User tries to post new link but is not logged in:
1209         // Show login screen, then redirect to ?post=...
1210         if (isset($_GET['post']))
1211         {
1212             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1213             exit;
1214         }
1215
1216                 // Same case as above except that user tried to access ?do=addlink without being logged in
1217                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1218                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1219                         header('Location: ?do=login&post=');
1220                         exit;
1221                 }
1222         showLinkList($PAGE, $LINKSDB);
1223         if (isset($_GET['edit_link'])) {
1224             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1225             exit;
1226         }
1227
1228         exit; // Never remove this one! All operations below are reserved for logged in user.
1229     }
1230
1231     // -------- All other functions are reserved for the registered user:
1232
1233     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1234     if ($targetPage == Router::$PAGE_TOOLS)
1235     {
1236         $data = array(
1237             'linkcount' => count($LINKSDB),
1238             'pageabsaddr' => index_url($_SERVER),
1239         );
1240         $pluginManager->executeHooks('render_tools', $data);
1241
1242         foreach ($data as $key => $value) {
1243             $PAGE->assign($key, $value);
1244         }
1245
1246         $PAGE->renderPage('tools');
1247         exit;
1248     }
1249
1250     // -------- User wants to change his/her password.
1251     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1252     {
1253         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1254         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1255         {
1256             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1257
1258             // Make sure old password is correct.
1259             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1260             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1261             // Save new password
1262             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1263             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1264             try {
1265                 writeConfig($GLOBALS, isLoggedIn());
1266             }
1267             catch(Exception $e) {
1268                 error_log(
1269                     'ERROR while writing config file after changing password.' . PHP_EOL .
1270                     $e->getMessage()
1271                 );
1272
1273                 // TODO: do not handle exceptions/errors in JS.
1274                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1275                 exit;
1276             }
1277             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1278             exit;
1279         }
1280         else // show the change password form.
1281         {
1282             $PAGE->assign('linkcount',count($LINKSDB));
1283             $PAGE->assign('token',getToken());
1284             $PAGE->renderPage('changepassword');
1285             exit;
1286         }
1287     }
1288
1289     // -------- User wants to change configuration
1290     if ($targetPage == Router::$PAGE_CONFIGURE)
1291     {
1292         if (!empty($_POST['title']) )
1293         {
1294             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1295             $tz = 'UTC';
1296             if (!empty($_POST['continent']) && !empty($_POST['city']))
1297                 if (isTimeZoneValid($_POST['continent'],$_POST['city']))
1298                     $tz = $_POST['continent'].'/'.$_POST['city'];
1299             $GLOBALS['timezone'] = $tz;
1300             $GLOBALS['title']=$_POST['title'];
1301             $GLOBALS['titleLink']=$_POST['titleLink'];
1302             $GLOBALS['redirector']=$_POST['redirector'];
1303             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1304             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1305             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1306             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1307             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1308             try {
1309                 writeConfig($GLOBALS, isLoggedIn());
1310             }
1311             catch(Exception $e) {
1312                 error_log(
1313                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1314                     $e->getMessage()
1315                 );
1316
1317                 // TODO: do not handle exceptions/errors in JS.
1318                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1319                 exit;
1320             }
1321             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1322             exit;
1323         }
1324         else // Show the configuration form.
1325         {
1326             $PAGE->assign('linkcount',count($LINKSDB));
1327             $PAGE->assign('token',getToken());
1328             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1329             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1330             list($timezone_form, $timezone_js) = generateTimeZoneForm($GLOBALS['timezone']);
1331             $PAGE->assign('timezone_form', $timezone_form);
1332             $PAGE->assign('timezone_js',$timezone_js);
1333             $PAGE->renderPage('configure');
1334             exit;
1335         }
1336     }
1337
1338     // -------- User wants to rename a tag or delete it
1339     if ($targetPage == Router::$PAGE_CHANGETAG)
1340     {
1341         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1342             $PAGE->assign('linkcount', count($LINKSDB));
1343             $PAGE->assign('token', getToken());
1344             $PAGE->assign('tags', $LINKSDB->allTags());
1345             $PAGE->renderPage('changetag');
1346             exit;
1347         }
1348
1349         if (!tokenOk($_POST['token'])) {
1350             die('Wrong token.');
1351         }
1352
1353         // Delete a tag:
1354         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1355             $needle=trim($_POST['fromtag']);
1356             // True for case-sensitive tag search.
1357             $linksToAlter = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $needle, true);
1358             foreach($linksToAlter as $key=>$value)
1359             {
1360                 $tags = explode(' ',trim($value['tags']));
1361                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1362                 $value['tags']=trim(implode(' ',$tags));
1363                 $LINKSDB[$key]=$value;
1364             }
1365             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1366             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1367             exit;
1368         }
1369
1370         // Rename a tag:
1371         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1372             $needle=trim($_POST['fromtag']);
1373             // True for case-sensitive tag search.
1374             $linksToAlter = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $needle, true);
1375             foreach($linksToAlter as $key=>$value)
1376             {
1377                 $tags = explode(' ',trim($value['tags']));
1378                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1379                 $value['tags']=trim(implode(' ',$tags));
1380                 $LINKSDB[$key]=$value;
1381             }
1382             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1383             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1384             exit;
1385         }
1386     }
1387
1388     // -------- User wants to add a link without using the bookmarklet: Show form.
1389     if ($targetPage == Router::$PAGE_ADDLINK)
1390     {
1391         $PAGE->assign('linkcount',count($LINKSDB));
1392         $PAGE->renderPage('addlink');
1393         exit;
1394     }
1395
1396     // -------- User clicked the "Save" button when editing a link: Save link to database.
1397     if (isset($_POST['save_edit']))
1398     {
1399         // Go away!
1400         if (! tokenOk($_POST['token'])) {
1401             die('Wrong token.');
1402         }
1403         // Remove multiple spaces.
1404         $tags = trim(preg_replace('/\s\s+/', ' ', $_POST['lf_tags']));
1405         // Remove first '-' char in tags.
1406         $tags = preg_replace('/(^| )\-/', '$1', $tags);
1407         // Remove duplicates.
1408         $tags = implode(' ', array_unique(explode(' ', $tags)));
1409         $linkdate = $_POST['lf_linkdate'];
1410         $url = trim($_POST['lf_url']);
1411         if (! startsWith($url, 'http:') && ! startsWith($url, 'https:')
1412             && ! startsWith($url, 'ftp:') && ! startsWith($url, 'magnet:')
1413             && ! startsWith($url, '?') && ! startsWith($url, 'javascript:')
1414         ) {
1415             $url = 'http://' . $url;
1416         }
1417
1418         $link = array(
1419             'title' => trim($_POST['lf_title']),
1420             'url' => $url,
1421             'description' => $_POST['lf_description'],
1422             'private' => (isset($_POST['lf_private']) ? 1 : 0),
1423             'linkdate' => $linkdate,
1424             'tags' => str_replace(',', ' ', $tags)
1425         );
1426         // If title is empty, use the URL as title.
1427         if ($link['title'] == '') {
1428             $link['title'] = $link['url'];
1429         }
1430
1431         $pluginManager->executeHooks('save_link', $link);
1432
1433         $LINKSDB[$linkdate] = $link;
1434         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1435         pubsubhub();
1436
1437         // If we are called from the bookmarklet, we must close the popup:
1438         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1439             echo '<script>self.close();</script>';
1440             exit;
1441         }
1442
1443         $returnurl = !empty($_POST['returnurl']) ? $_POST['returnurl'] : '?';
1444         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1445         // Scroll to the link which has been edited.
1446         $location .= '#' . smallHash($_POST['lf_linkdate']);
1447         // After saving the link, redirect to the page the user was on.
1448         header('Location: '. $location);
1449         exit;
1450     }
1451
1452     // -------- User clicked the "Cancel" button when editing a link.
1453     if (isset($_POST['cancel_edit']))
1454     {
1455         // If we are called from the bookmarklet, we must close the popup:
1456         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1457         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1458         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1459         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1460         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1461         exit;
1462     }
1463
1464     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1465     if (isset($_POST['delete_link']))
1466     {
1467         if (!tokenOk($_POST['token'])) die('Wrong token.');
1468         // We do not need to ask for confirmation:
1469         // - confirmation is handled by JavaScript
1470         // - we are protected from XSRF by the token.
1471         $linkdate=$_POST['lf_linkdate'];
1472
1473         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1474
1475         unset($LINKSDB[$linkdate]);
1476         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // save to disk
1477
1478         // If we are called from the bookmarklet, we must close the popup:
1479         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1480         // Pick where we're going to redirect
1481         // =============================================================
1482         // Basically, we can't redirect to where we were previously if it was a permalink
1483         // or an edit_link, because it would 404.
1484         // Cases:
1485         //    - /             : nothing in $_GET, redirect to self
1486         //    - /?page        : redirect to self
1487         //    - /?searchterm  : redirect to self (there might be other links)
1488         //    - /?searchtags  : redirect to self
1489         //    - /permalink    : redirect to / (the link does not exist anymore)
1490         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1491         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1492         // redirect is not satisfied, and only then redirect to /
1493         $location = "?";
1494         // Self redirection
1495         if (count($_GET) == 0
1496             || isset($_GET['page'])
1497             || isset($_GET['searchterm'])
1498             || isset($_GET['searchtags'])
1499         ) {
1500             if (isset($_POST['returnurl'])) {
1501                 $location = $_POST['returnurl']; // Handle redirects given by the form
1502             } else {
1503                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1504             }
1505         }
1506
1507         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1508         exit;
1509     }
1510
1511     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1512     if (isset($_GET['edit_link']))
1513     {
1514         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1515         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1516         $data = array(
1517             'linkcount' => count($LINKSDB),
1518             'link' => $link,
1519             'link_is_new' => false,
1520             'token' => getToken(),
1521             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1522             'tags' => $LINKSDB->allTags(),
1523         );
1524         $pluginManager->executeHooks('render_editlink', $data);
1525
1526         foreach ($data as $key => $value) {
1527             $PAGE->assign($key, $value);
1528         }
1529
1530         $PAGE->renderPage('editlink');
1531         exit;
1532     }
1533
1534     // -------- User want to post a new link: Display link edit form.
1535     if (isset($_GET['post'])) {
1536         $url = cleanup_url(escape($_GET['post']));
1537
1538         $link_is_new = false;
1539         // Check if URL is not already in database (in this case, we will edit the existing link)
1540         $link = $LINKSDB->getLinkFromUrl($url);
1541         if (!$link)
1542         {
1543             $link_is_new = true;
1544             $linkdate = strval(date('Ymd_His'));
1545             // Get title if it was provided in URL (by the bookmarklet).
1546             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1547             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1548             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1549             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1550             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1551             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1552             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1553                 // Short timeout to keep the application responsive
1554                 list($headers, $content) = get_http_response($url, 4);
1555                 if (strpos($headers[0], '200 OK') !== false) {
1556                     // Retrieve charset.
1557                     $charset = get_charset($headers, $content);
1558                     // Extract title.
1559                     $title = html_extract_title($content);
1560                     // Re-encode title in utf-8 if necessary.
1561                     if (! empty($title) && $charset != 'utf-8') {
1562                         $title = mb_convert_encoding($title, $charset, 'utf-8');
1563                     }
1564                 }
1565             }
1566
1567             if ($url == '') {
1568                 $url = '?' . smallHash($linkdate);
1569                 $title = 'Note: ';
1570             }
1571
1572             $link = array(
1573                 'linkdate' => $linkdate,
1574                 'title' => $title,
1575                 'url' => $url,
1576                 'description' => $description,
1577                 'tags' => $tags,
1578                 'private' => $private
1579             );
1580         }
1581
1582         $data = array(
1583             'linkcount' => count($LINKSDB),
1584             'link' => $link,
1585             'link_is_new' => $link_is_new,
1586             'token' => getToken(), // XSRF protection.
1587             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1588             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1589             'tags' => $LINKSDB->allTags(),
1590         );
1591         $pluginManager->executeHooks('render_editlink', $data);
1592
1593         foreach ($data as $key => $value) {
1594             $PAGE->assign($key, $value);
1595         }
1596
1597         $PAGE->renderPage('editlink');
1598         exit;
1599     }
1600
1601     // -------- Export as Netscape Bookmarks HTML file.
1602     if ($targetPage == Router::$PAGE_EXPORT)
1603     {
1604         if (empty($_GET['what']))
1605         {
1606             $PAGE->assign('linkcount',count($LINKSDB));
1607             $PAGE->renderPage('export');
1608             exit;
1609         }
1610         $exportWhat=$_GET['what'];
1611         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1612
1613         header('Content-Type: text/html; charset=utf-8');
1614         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1615         $currentdate=date('Y/m/d H:i:s');
1616         echo <<<HTML
1617 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1618 <!-- This is an automatically generated file.
1619      It will be read and overwritten.
1620      DO NOT EDIT! -->
1621 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1622 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1623 <TITLE>Bookmarks</TITLE>
1624 <H1>Bookmarks</H1>
1625 HTML;
1626         foreach($LINKSDB as $link)
1627         {
1628             if ($exportWhat=='all' ||
1629                ($exportWhat=='private' && $link['private']!=0) ||
1630                ($exportWhat=='public' && $link['private']==0))
1631             {
1632                 $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
1633                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.$date->getTimestamp().'" PRIVATE="'.$link['private'].'"';
1634                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1635                 echo '>'.$link['title']."</A>\n";
1636                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1637             }
1638         }
1639                 exit;
1640     }
1641
1642     // -------- User is uploading a file for import
1643     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1644     {
1645         // If file is too big, some form field may be missing.
1646         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1647         {
1648             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1649             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1650             exit;
1651         }
1652         if (!tokenOk($_POST['token'])) die('Wrong token.');
1653         importFile();
1654         exit;
1655     }
1656
1657     // -------- Show upload/import dialog:
1658     if ($targetPage == Router::$PAGE_IMPORT)
1659     {
1660         $PAGE->assign('linkcount',count($LINKSDB));
1661         $PAGE->assign('token',getToken());
1662         $PAGE->assign('maxfilesize',getMaxFileSize());
1663         $PAGE->renderPage('import');
1664         exit;
1665     }
1666
1667     // Plugin administration page
1668     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1669         $pluginMeta = $pluginManager->getPluginsMeta();
1670
1671         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1672         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1673         // Load parameters.
1674         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $GLOBALS['plugins']);
1675         uasort(
1676             $enabledPlugins,
1677             function($a, $b) { return $a['order'] - $b['order']; }
1678         );
1679         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1680
1681         $PAGE->assign('enabledPlugins', $enabledPlugins);
1682         $PAGE->assign('disabledPlugins', $disabledPlugins);
1683         $PAGE->renderPage('pluginsadmin');
1684         exit;
1685     }
1686
1687     // Plugin administration form action
1688     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1689         try {
1690             if (isset($_POST['parameters_form'])) {
1691                 unset($_POST['parameters_form']);
1692                 foreach ($_POST as $param => $value) {
1693                     $GLOBALS['plugins'][$param] = escape($value);
1694                 }
1695             }
1696             else {
1697                 $GLOBALS['config']['ENABLED_PLUGINS'] = save_plugin_config($_POST);
1698             }
1699             writeConfig($GLOBALS, isLoggedIn());
1700         }
1701         catch (Exception $e) {
1702             error_log(
1703                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1704                 $e->getMessage()
1705             );
1706
1707             // TODO: do not handle exceptions/errors in JS.
1708             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do='. Router::$PAGE_PLUGINSADMIN .'\';</script>';
1709             exit;
1710         }
1711         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1712         exit;
1713     }
1714
1715     // -------- Otherwise, simply display search form and links:
1716     showLinkList($PAGE, $LINKSDB);
1717     exit;
1718 }
1719
1720 // -----------------------------------------------------------------------------------------------
1721 // Process the import file form.
1722 function importFile()
1723 {
1724     if (!isLoggedIn()) { die('Not allowed.'); }
1725     $LINKSDB = new LinkDB(
1726         $GLOBALS['config']['DATASTORE'],
1727         isLoggedIn(),
1728         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1729         $GLOBALS['redirector']
1730     );
1731     $filename=$_FILES['filetoupload']['name'];
1732     $filesize=$_FILES['filetoupload']['size'];
1733     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1734     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1735     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1736     $import_count=0;
1737
1738     // Sniff file type:
1739     $type='unknown';
1740     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1741
1742     // Then import the bookmarks.
1743     if ($type=='netscape')
1744     {
1745         // This is a standard Netscape-style bookmark file.
1746         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1747         foreach(explode('<DT>',$data) as $html) // explode is very fast
1748         {
1749             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1750             $d = explode('<DD>',$html);
1751             if (startswith($d[0],'<A '))
1752             {
1753                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1754                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1755                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1756                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1757                 $raw_add_date=0;
1758                 foreach($matches as $m)
1759                 {
1760                     $attr=$m[1]; $value=$m[2];
1761                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1762                     elseif ($attr=='ADD_DATE')
1763                     {
1764                         $raw_add_date=intval($value);
1765                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1766                     }
1767                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1768                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1769                 }
1770                 if ($link['url']!='')
1771                 {
1772                     if ($private==1) $link['private']=1;
1773                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1774                     if ($dblink==false)
1775                     {  // Link not in database, let's import it...
1776                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1777
1778                        // Make sure date/time is not already used by another link.
1779                        // (Some bookmark files have several different links with the same ADD_DATE)
1780                        // We increment date by 1 second until we find a date which is not used in DB.
1781                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1782                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1783                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1784                        $LINKSDB[$link['linkdate']] = $link;
1785                        $import_count++;
1786                     }
1787                     else // Link already present in database.
1788                     {
1789                         if ($overwrite)
1790                         {   // If overwrite is required, we import link data, except date/time.
1791                             $link['linkdate']=$dblink['linkdate'];
1792                             $LINKSDB[$link['linkdate']] = $link;
1793                             $import_count++;
1794                         }
1795                     }
1796
1797                 }
1798             }
1799         }
1800         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1801
1802         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1803     }
1804     else
1805     {
1806         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1807     }
1808 }
1809
1810 // -----------------------------------------------------------------------------------------------
1811 // Template for the list of links (<div id="linklist">)
1812 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1813 function buildLinkList($PAGE,$LINKSDB)
1814 {
1815     // Filter link database according to parameters.
1816     $searchtags = !empty($_GET['searchtags']) ? escape($_GET['searchtags']) : '';
1817     $searchterm = !empty($_GET['searchterm']) ? escape(trim($_GET['searchterm'])) : '';
1818     $privateonly = !empty($_SESSION['privateonly']) ? true : false;
1819
1820     // Search tags + fullsearch.
1821     if (! empty($searchtags) && ! empty($searchterm)) {
1822         $linksToDisplay = $LINKSDB->filter(
1823             LinkFilter::$FILTER_TAG | LinkFilter::$FILTER_TEXT,
1824             array($searchtags, $searchterm),
1825             false,
1826             $privateonly
1827         );
1828     }
1829     // Search by tags.
1830     elseif (! empty($searchtags)) {
1831         $linksToDisplay = $LINKSDB->filter(
1832             LinkFilter::$FILTER_TAG,
1833             $searchtags,
1834             false,
1835             $privateonly
1836         );
1837     }
1838     // Fulltext search.
1839     elseif (! empty($searchterm)) {
1840         $linksToDisplay = $LINKSDB->filter(
1841             LinkFilter::$FILTER_TEXT,
1842             $searchterm,
1843             false,
1844             $privateonly
1845         );
1846     }
1847     // Detect smallHashes in URL.
1848     elseif (! empty($_SERVER['QUERY_STRING'])
1849         && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/', $_SERVER['QUERY_STRING'])
1850     ) {
1851         $linksToDisplay = $LINKSDB->filter(
1852             LinkFilter::$FILTER_HASH,
1853             substr(trim($_SERVER["QUERY_STRING"], '/'), 0, 6)
1854         );
1855
1856         if (count($linksToDisplay) == 0) {
1857             $PAGE->render404('The link you are trying to reach does not exist or has been deleted.');
1858             exit;
1859         }
1860     }
1861     // Otherwise, display without filtering.
1862     else {
1863         $linksToDisplay = $LINKSDB->filter('', '', false, $privateonly);
1864     }
1865
1866     // ---- Handle paging.
1867     $keys = array();
1868     foreach ($linksToDisplay as $key => $value) {
1869         $keys[] = $key;
1870     }
1871
1872     // If there is only a single link, we change on-the-fly the title of the page.
1873     if (count($linksToDisplay) == 1) {
1874         $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1875     }
1876
1877     // Select articles according to paging.
1878     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1879     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1880     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1881     $page = $page < 1 ? 1 : $page;
1882     $page = $page > $pagecount ? $pagecount : $page;
1883     // Start index.
1884     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1885     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1886     $linkDisp = array();
1887     while ($i<$end && $i<count($keys))
1888     {
1889         $link = $linksToDisplay[$keys[$i]];
1890         $link['description'] = format_description($link['description'], $GLOBALS['redirector']);
1891         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
1892         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
1893         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
1894         $link['timestamp'] = $date->getTimestamp();
1895         $taglist = explode(' ', $link['tags']);
1896         uasort($taglist, 'strcasecmp');
1897         $link['taglist'] = $taglist;
1898         $link['shorturl'] = smallHash($link['linkdate']);
1899         // Check for both signs of a note: starting with ? and 7 chars long.
1900         if ($link['url'][0] === '?' &&
1901             strlen($link['url']) === 7) {
1902             $link['url'] = index_url($_SERVER) . $link['url'];
1903         }
1904
1905         $linkDisp[$keys[$i]] = $link;
1906         $i++;
1907     }
1908
1909     // Compute paging navigation
1910     $searchtagsUrl = empty($searchtags) ? '' : '&searchtags=' . urlencode($searchtags);
1911     $searchtermUrl = empty($searchterm) ? '' : '&searchterm=' . urlencode($searchterm);
1912     $previous_page_url = '';
1913     if ($i != count($keys)) {
1914         $previous_page_url = '?page=' . ($page+1) . $searchtermUrl . $searchtagsUrl;
1915     }
1916     $next_page_url='';
1917     if ($page>1) {
1918         $next_page_url = '?page=' . ($page-1) . $searchtermUrl . $searchtagsUrl;
1919     }
1920
1921     $token = isLoggedIn() ? getToken() : '';
1922
1923     // Fill all template fields.
1924     $data = array(
1925         'linkcount' => count($LINKSDB),
1926         'previous_page_url' => $previous_page_url,
1927         'next_page_url' => $next_page_url,
1928         'page_current' => $page,
1929         'page_max' => $pagecount,
1930         'result_count' => count($linksToDisplay),
1931         'search_term' => $searchterm,
1932         'search_tags' => $searchtags,
1933         'redirector' => empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'],  // Optional redirector URL.
1934         'token' => $token,
1935         'links' => $linkDisp,
1936         'tags' => $LINKSDB->allTags(),
1937     );
1938     // FIXME! temporary fix - see #399.
1939     if (!empty($GLOBALS['pagetitle']) && count($linkDisp) == 1) {
1940         $data['pagetitle'] = $GLOBALS['pagetitle'];
1941     }
1942
1943     $pluginManager = PluginManager::getInstance();
1944     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
1945
1946     foreach ($data as $key => $value) {
1947         $PAGE->assign($key, $value);
1948     }
1949
1950     return;
1951 }
1952
1953 // Compute the thumbnail for a link.
1954 //
1955 // With a link to the original URL.
1956 // Understands various services (youtube.com...)
1957 // Input: $url = URL for which the thumbnail must be found.
1958 //        $href = if provided, this URL will be followed instead of $url
1959 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1960 // Some of them may be missing.
1961 // Return an empty array if no thumbnail available.
1962 function computeThumbnail($url,$href=false)
1963 {
1964     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
1965     if ($href==false) $href=$url;
1966
1967     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1968     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1969     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1970     $domain = parse_url($url,PHP_URL_HOST);
1971     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1972     {
1973         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1974         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1975                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1976     }
1977     if ($domain=='youtu.be') // Youtube short links
1978     {
1979         $path = parse_url($url,PHP_URL_PATH);
1980         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1981                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1982     }
1983     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1984     {
1985         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1986         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1987                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1988     }
1989
1990     if ($domain=='imgur.com')
1991     {
1992         $path = parse_url($url,PHP_URL_PATH);
1993         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1994         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1995                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1996         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1997                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1998
1999         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
2000                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2001     }
2002     if ($domain=='i.imgur.com')
2003     {
2004         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
2005         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
2006                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2007     }
2008     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
2009     {
2010         if (strpos($url,'dailymotion.com/video/')!==false)
2011         {
2012             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
2013             return array('src'=>$thumburl,
2014                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
2015         }
2016     }
2017     if (endsWith($domain,'.imageshack.us'))
2018     {
2019         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2020         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2021         {
2022             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
2023             return array('src'=>$thumburl,
2024                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
2025         }
2026     }
2027
2028     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
2029     // So we deport the thumbnail generation in order not to slow down page generation
2030     // (and we also cache the thumbnail)
2031
2032     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
2033
2034     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
2035         || $domain=='vimeo.com'
2036         || $domain=='ted.com' || endsWith($domain,'.ted.com')
2037         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
2038     )
2039     {
2040         if ($domain=='vimeo.com')
2041         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
2042             $path = parse_url($url,PHP_URL_PATH);
2043             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
2044         }
2045         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2046         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
2047             $path = parse_url($url,PHP_URL_PATH);
2048             if (!preg_match('!/\d+.+?!',$path)) return array();
2049         }
2050         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2051         {   // Make sure this TED URL points to a video (/talks/...)
2052             $path = parse_url($url,PHP_URL_PATH);
2053             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
2054         }
2055         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2056         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2057                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2058     }
2059
2060     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
2061     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
2062     // But using the extension will do.
2063     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2064     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2065     {
2066         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2067         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2068                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2069     }
2070     return array(); // No thumbnail.
2071
2072 }
2073
2074
2075 // Returns the HTML code to display a thumbnail for a link
2076 // with a link to the original URL.
2077 // Understands various services (youtube.com...)
2078 // Input: $url = URL for which the thumbnail must be found.
2079 //        $href = if provided, this URL will be followed instead of $url
2080 // Returns '' if no thumbnail available.
2081 function thumbnail($url,$href=false)
2082 {
2083     $t = computeThumbnail($url,$href);
2084     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2085
2086     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
2087     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2088     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2089     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2090     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2091     $html.='></a>';
2092     return $html;
2093 }
2094
2095 // Returns the HTML code to display a thumbnail for a link
2096 // for the picture wall (using lazy image loading)
2097 // Understands various services (youtube.com...)
2098 // Input: $url = URL for which the thumbnail must be found.
2099 //        $href = if provided, this URL will be followed instead of $url
2100 // Returns '' if no thumbnail available.
2101 function lazyThumbnail($url,$href=false)
2102 {
2103     $t = computeThumbnail($url,$href);
2104     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2105
2106     $html='<a href="'.escape($t['href']).'">';
2107
2108     // Lazy image
2109     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
2110
2111     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2112     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2113     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2114     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2115     $html.='>';
2116
2117     // No-JavaScript fallback.
2118     $html.='<noscript><img src="'.escape($t['src']).'"';
2119     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2120     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2121     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2122     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2123     $html.='></noscript></a>';
2124
2125     return $html;
2126 }
2127
2128
2129 // -----------------------------------------------------------------------------------------------
2130 // Installation
2131 // This function should NEVER be called if the file data/config.php exists.
2132 function install()
2133 {
2134     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2135     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2136
2137
2138     // This part makes sure sessions works correctly.
2139     // (Because on some hosts, session.save_path may not be set correctly,
2140     // or we may not have write access to it.)
2141     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2142     {   // Step 2: Check if data in session is correct.
2143         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2144         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2145         echo 'It currently points to '.session_save_path().'<br>';
2146         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2147         echo '<br><a href="?">Click to try again.</a></pre>';
2148         die;
2149     }
2150     if (!isset($_SESSION['session_tested']))
2151     {   // Step 1 : Try to store data in session and reload page.
2152         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2153         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
2154     }
2155     if (isset($_GET['test_session']))
2156     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2157         header('Location: '.index_url($_SERVER));
2158     }
2159
2160
2161     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2162     {
2163         $tz = 'UTC';
2164         if (!empty($_POST['continent']) && !empty($_POST['city'])) {
2165             if (isTimeZoneValid($_POST['continent'], $_POST['city'])) {
2166                 $tz = $_POST['continent'].'/'.$_POST['city'];
2167             }
2168         }
2169         $GLOBALS['timezone'] = $tz;
2170         // Everything is ok, let's create config file.
2171         $GLOBALS['login'] = $_POST['setlogin'];
2172         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2173         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2174         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(index_url($_SERVER)) : $_POST['title'] );
2175         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2176         try {
2177             writeConfig($GLOBALS, isLoggedIn());
2178         }
2179         catch(Exception $e) {
2180             error_log(
2181                     'ERROR while writing config file after installation.' . PHP_EOL .
2182                     $e->getMessage()
2183                 );
2184
2185             // TODO: do not handle exceptions/errors in JS.
2186             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2187             exit;
2188         }
2189         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2190         exit;
2191     }
2192
2193     // Display config form:
2194     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2195     $timezone_html = '';
2196     if ($timezone_form != '') {
2197         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2198     }
2199
2200     $PAGE = new pageBuilder;
2201     $PAGE->assign('timezone_html',$timezone_html);
2202     $PAGE->assign('timezone_js',$timezone_js);
2203     $PAGE->renderPage('install');
2204     exit;
2205 }
2206
2207 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2208    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2209    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2210    This function is called by passing the URL:
2211    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2212    [URL] is the URL of the link (e.g. a flickr page)
2213    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2214    The function below will fetch the image from the webservice and store it in the cache.
2215 */
2216 function genThumbnail()
2217 {
2218     // Make sure the parameters in the URL were generated by us.
2219     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2220     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2221
2222     // Let's see if we don't already have the image for this URL in the cache.
2223     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2224     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2225     {   // We have the thumbnail, just serve it:
2226         header('Content-Type: image/jpeg');
2227         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2228         return;
2229     }
2230     // We may also serve a blank image (if service did not respond)
2231     $blankname=hash('sha1',$_GET['url']).'.gif';
2232     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2233     {
2234         header('Content-Type: image/gif');
2235         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2236         return;
2237     }
2238
2239     // Otherwise, generate the thumbnail.
2240     $url = $_GET['url'];
2241     $domain = parse_url($url,PHP_URL_HOST);
2242
2243     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2244     {
2245         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2246         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2247
2248         // Is this a link to an image, or to a flickr page ?
2249         $imageurl='';
2250         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2251         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2252             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2253             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2254         }
2255         else // This is a flickr page (html)
2256         {
2257             // Get the flickr html page.
2258             list($headers, $content) = get_http_response($url, 20);
2259             if (strpos($headers[0], '200 OK') !== false)
2260             {
2261                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2262                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2263                 if (!empty($matches[1])) $imageurl=$matches[1];
2264
2265                 // In albums (and some other pages), the link rel="image_src" is not provided,
2266                 // but flickr provides:
2267                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2268                 if ($imageurl=='')
2269                 {
2270                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2271                     if (!empty($matches[1])) $imageurl=$matches[1];
2272                 }
2273             }
2274         }
2275
2276         if ($imageurl!='')
2277         {   // Let's download the image.
2278             // Image is 240x120, so 10 seconds to download should be enough.
2279             list($headers, $content) = get_http_response($imageurl, 10);
2280             if (strpos($headers[0], '200 OK') !== false) {
2281                 // Save image to cache.
2282                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/' . $thumbname, $content);
2283                 header('Content-Type: image/jpeg');
2284                 echo $content;
2285                 return;
2286             }
2287         }
2288     }
2289
2290     elseif ($domain=='vimeo.com' )
2291     {
2292         // This is more complex: we have to perform a HTTP request, then parse the result.
2293         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2294         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2295         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2296         if (strpos($headers[0], '200 OK') !== false) {
2297             $t = unserialize($content);
2298             $imageurl = $t[0]['thumbnail_medium'];
2299             // Then we download the image and serve it to our client.
2300             list($headers, $content) = get_http_response($imageurl, 10);
2301             if (strpos($headers[0], '200 OK') !== false) {
2302                 // Save image to cache.
2303                 file_put_contents($GLOBALS['config']['CACHEDIR'] . '/' . $thumbname, $content);
2304                 header('Content-Type: image/jpeg');
2305                 echo $content;
2306                 return;
2307             }
2308         }
2309     }
2310
2311     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2312     {
2313         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2314         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2315         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2316         list($headers, $content) = get_http_response($url, 5);
2317         if (strpos($headers[0], '200 OK') !== false) {
2318             // Extract the link to the thumbnail
2319             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2320             if (!empty($matches[1]))
2321             {   // Let's download the image.
2322                 $imageurl=$matches[1];
2323                 // No control on image size, so wait long enough
2324                 list($headers, $content) = get_http_response($imageurl, 20);
2325                 if (strpos($headers[0], '200 OK') !== false) {
2326                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2327                     file_put_contents($filepath, $content); // Save image to cache.
2328                     if (resizeImage($filepath))
2329                     {
2330                         header('Content-Type: image/jpeg');
2331                         echo file_get_contents($filepath);
2332                         return;
2333                     }
2334                 }
2335             }
2336         }
2337     }
2338
2339     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2340     {
2341         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2342         // http://xkcd.com/327/
2343         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2344         list($headers, $content) = get_http_response($url, 5);
2345         if (strpos($headers[0], '200 OK') !== false) {
2346             // Extract the link to the thumbnail
2347             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2348             if (!empty($matches[1]))
2349             {   // Let's download the image.
2350                 $imageurl=$matches[1];
2351                 // No control on image size, so wait long enough
2352                 list($headers, $content) = get_http_response($imageurl, 20);
2353                 if (strpos($headers[0], '200 OK') !== false) {
2354                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2355                     // Save image to cache.
2356                     file_put_contents($filepath, $content);
2357                     if (resizeImage($filepath))
2358                     {
2359                         header('Content-Type: image/jpeg');
2360                         echo file_get_contents($filepath);
2361                         return;
2362                     }
2363                 }
2364             }
2365         }
2366     }
2367
2368     else
2369     {
2370         // For all other domains, we try to download the image and make a thumbnail.
2371         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2372         list($headers, $content) = get_http_response($url, 30);
2373         if (strpos($headers[0], '200 OK') !== false) {
2374             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2375             // Save image to cache.
2376             file_put_contents($filepath, $content);
2377             if (resizeImage($filepath))
2378             {
2379                 header('Content-Type: image/jpeg');
2380                 echo file_get_contents($filepath);
2381                 return;
2382             }
2383         }
2384     }
2385
2386
2387     // Otherwise, return an empty image (8x8 transparent gif)
2388     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2389     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2390     header('Content-Type: image/gif');
2391     echo $blankgif;
2392 }
2393
2394 // Make a thumbnail of the image (to width: 120 pixels)
2395 // Returns true if success, false otherwise.
2396 function resizeImage($filepath)
2397 {
2398     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2399
2400     // Trick: some stupid people rename GIF as JPEG... or else.
2401     // So we really try to open each image type whatever the extension is.
2402     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2403     $im=false;
2404     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2405     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2406     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2407     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2408     $w = imagesx($im);
2409     $h = imagesy($im);
2410     $ystart = 0; $yheight=$h;
2411     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2412     $nw = 120;   // Desired width
2413     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2414     // Resize image:
2415     $im2 = imagecreatetruecolor($nw,$nh);
2416     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2417     imageinterlace($im2,true); // For progressive JPEG.
2418     $tempname=$filepath.'_TEMP.jpg';
2419     imagejpeg($im2, $tempname, 90);
2420     imagedestroy($im);
2421     imagedestroy($im2);
2422     unlink($filepath);
2423     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2424     return true;
2425 }
2426
2427 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2428 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2429 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2430 renderPage();
2431 ?>