index.php

   1 <?php
   2 /**
   3  * Shaarli v0.6.5 - Shaare your links...
   4  *
   5  * The personal, minimalist, super-fast, no-database Delicious clone.
   6  *
   7  * Friendly fork by the Shaarli community:
   8  *  - https://github.com/shaarli/Shaarli
   9  *
  10  * Original project by sebsauvage.net:
  11  *  - http://sebsauvage.net/wiki/doku.php?id=php:shaarli
  12  *  - https://github.com/sebsauvage/Shaarli
  13  *
  14  * Licence: http://www.opensource.org/licenses/zlib-license.php
  15  *
  16  * Requires: PHP 5.3.x
  17  */
  18
  19 // Set 'UTC' as the default timezone if it is not defined in php.ini
  20 // See http://php.net/manual/en/datetime.configuration.php#ini.date.timezone
  21 if (date_default_timezone_get() == '') {
  22     date_default_timezone_set('UTC');
  23 }
  24
  25 /* -----------------------------------------------------------------------------
  26  * Hardcoded parameters
  27  * You should not touch any code below (or at your own risks!)
  28  * (These parameters can be overwritten by editing the file /data/config.php)
  29  * -----------------------------------------------------------------------------
  30  */
  31
  32 /*
  33  * Shaarli directories & configuration files
  34  */
  35 // Data subdirectory
  36 $GLOBALS['config']['DATADIR'] = 'data';
  37
  38 // Main configuration file
  39 $GLOBALS['config']['CONFIG_FILE'] = $GLOBALS['config']['DATADIR'].'/config.php';
  40
  41 // Link datastore
  42 $GLOBALS['config']['DATASTORE'] = $GLOBALS['config']['DATADIR'].'/datastore.php';
  43
  44 // Banned IPs
  45 $GLOBALS['config']['IPBANS_FILENAME'] = $GLOBALS['config']['DATADIR'].'/ipbans.php';
  46
  47 // Processed updates file.
  48 $GLOBALS['config']['UPDATES_FILE'] = $GLOBALS['config']['DATADIR'].'/updates.txt';
  49
  50 // Access log
  51 $GLOBALS['config']['LOG_FILE'] = $GLOBALS['config']['DATADIR'].'/log.txt';
  52
  53 // For updates check of Shaarli
  54 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt';
  55
  56 // Set ENABLE_UPDATECHECK to disabled by default.
  57 $GLOBALS['config']['ENABLE_UPDATECHECK'] = false;
  58
  59 // RainTPL cache directory (keep the trailing slash!)
  60 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp/';
  61 // Raintpl template directory (keep the trailing slash!)
  62 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/';
  63
  64 // Thumbnail cache directory
  65 $GLOBALS['config']['CACHEDIR'] = 'cache';
  66
  67 // Atom & RSS feed cache directory
  68 $GLOBALS['config']['PAGECACHE'] = 'pagecache';
  69
  70 /*
  71  * Global configuration
  72  */
  73 // Ban IP after this many failures
  74 $GLOBALS['config']['BAN_AFTER'] = 4;
  75 // Ban duration for IP address after login failures (in seconds)
  76 $GLOBALS['config']['BAN_DURATION'] = 1800;
  77
  78 // Feed options
  79 // Enable RSS permalinks by default.
  80 // This corresponds to the default behavior of shaarli before this was added as an option.
  81 $GLOBALS['config']['ENABLE_RSS_PERMALINKS'] = true;
  82 // If true, an extra "ATOM feed" button will be displayed in the toolbar
  83 $GLOBALS['config']['SHOW_ATOM'] = false;
  84
  85 // Link display options
  86 $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = false;
  87 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false;
  88 $GLOBALS['config']['LINKS_PER_PAGE'] = 20;
  89
  90 // Open Shaarli (true): anyone can add/edit/delete links without having to login
  91 $GLOBALS['config']['OPEN_SHAARLI'] = false;
  92
  93 // Thumbnails
  94 // Display thumbnails in links
  95 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true;
  96 // Store thumbnails in a local cache
  97 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true;
  98
  99 // Update check frequency for Shaarli. 86400 seconds=24 hours
 100 $GLOBALS['config']['UPDATECHECK_BRANCH'] = 'stable';
 101 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400;
 102
 103 $GLOBALS['config']['REDIRECTOR_URLENCODE'] = true;
 104
 105 /*
 106  * Plugin configuration
 107  *
 108  * Warning: order matters!
 109  *
 110  * These settings may be be overriden in:
 111  *  - data/config.php
 112  *  - each plugin's configuration file
 113  */
 114 //$GLOBALS['config']['ENABLED_PLUGINS'] = array(
 115 //    'qrcode', 'archiveorg', 'readityourself', 'demo_plugin', 'playvideos',
 116 //    'wallabag', 'markdown', 'addlink_toolbar',
 117 //);
 118 $GLOBALS['config']['ENABLED_PLUGINS'] = array('qrcode');
 119
 120 // Initialize plugin parameters array.
 121 $GLOBALS['plugins'] = array();
 122
 123 // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
 124 $GLOBALS['config']['PUBSUBHUB_URL'] = '';
 125
 126 /*
 127  * PHP configuration
 128  */
 129 define('shaarli_version', '0.6.5');
 130
 131 // http://server.com/x/shaarli --> /shaarli/
 132 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
 133
 134 // High execution time in case of problematic imports/exports.
 135 ini_set('max_input_time','60');
 136
 137 // Try to set max upload file size and read
 138 ini_set('memory_limit', '128M');
 139 ini_set('post_max_size', '16M');
 140 ini_set('upload_max_filesize', '16M');
 141
 142 // See all error except warnings
 143 error_reporting(E_ALL^E_WARNING);
 144 // See all errors (for debugging only)
 145 //error_reporting(-1);
 146
 147 /*
 148  * User configuration
 149  */
 150 if (is_file($GLOBALS['config']['CONFIG_FILE'])) {
 151     require_once $GLOBALS['config']['CONFIG_FILE'];
 152 }
 153
 154 // Shaarli library
 155 require_once 'application/ApplicationUtils.php';
 156 require_once 'application/Cache.php';
 157 require_once 'application/CachedPage.php';
 158 require_once 'application/FeedBuilder.php';
 159 require_once 'application/FileUtils.php';
 160 require_once 'application/HttpUtils.php';
 161 require_once 'application/LinkDB.php';
 162 require_once 'application/LinkFilter.php';
 163 require_once 'application/LinkUtils.php';
 164 require_once 'application/NetscapeBookmarkUtils.php';
 165 require_once 'application/TimeZone.php';
 166 require_once 'application/Url.php';
 167 require_once 'application/Utils.php';
 168 require_once 'application/Config.php';
 169 require_once 'application/PluginManager.php';
 170 require_once 'application/Router.php';
 171 require_once 'application/Updater.php';
 172
 173 // Ensure the PHP version is supported
 174 try {
 175     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
 176 } catch(Exception $exc) {
 177     header('Content-Type: text/plain; charset=utf-8');
 178     echo $exc->getMessage();
 179     exit;
 180 }
 181
 182 // Force cookie path (but do not change lifetime)
 183 $cookie = session_get_cookie_params();
 184 $cookiedir = '';
 185 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
 186     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
 187 }
 188 // Set default cookie expiration and path.
 189 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 190 // Set session parameters on server side.
 191 // If the user does not access any page within this time, his/her session is considered expired.
 192 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 193 // Use cookies to store session.
 194 ini_set('session.use_cookies', 1);
 195 // Force cookies for session (phpsessionID forbidden in URL).
 196 ini_set('session.use_only_cookies', 1);
 197 // Prevent PHP form using sessionID in URL if cookies are disabled.
 198 ini_set('session.use_trans_sid', false);
 199
 200 session_name('shaarli');
 201 // Start session if needed (Some server auto-start sessions).
 202 if (session_id() == '') {
 203     session_start();
 204 }
 205
 206 // Regenerate session ID if invalid or not defined in cookie.
 207 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 208     session_regenerate_id(true);
 209     $_COOKIE['shaarli'] = session_id();
 210 }
 211
 212 include "inc/rain.tpl.class.php"; //include Rain TPL
 213 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
 214 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
 215
 216 $pluginManager = PluginManager::getInstance();
 217 $pluginManager->load($GLOBALS['config']['ENABLED_PLUGINS']);
 218
 219 ob_start();  // Output buffering for the page cache.
 220
 221
 222 // In case stupid admin has left magic_quotes enabled in php.ini:
 223 if (get_magic_quotes_gpc())
 224 {
 225     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 226     $_POST = array_map('stripslashes_deep', $_POST);
 227     $_GET = array_map('stripslashes_deep', $_GET);
 228     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 229 }
 230
 231 // Prevent caching on client side or proxy: (yes, it's ugly)
 232 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 233 header("Cache-Control: no-store, no-cache, must-revalidate");
 234 header("Cache-Control: post-check=0, pre-check=0", false);
 235 header("Pragma: no-cache");
 236
 237 // Handling of old config file which do not have the new parameters.
 238 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(index_url($_SERVER));
 239 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 240 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 241 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 242 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 243 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 244 // I really need to rewrite Shaarli with a proper configuation manager.
 245
 246 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 247     // Ensure Shaarli has proper access to its resources
 248     $errors = ApplicationUtils::checkResourcePermissions($GLOBALS['config']);
 249
 250     if ($errors != array()) {
 251         $message = '<p>Insufficient permissions:</p><ul>';
 252
 253         foreach ($errors as $error) {
 254             $message .= '<li>'.$error.'</li>';
 255         }
 256         $message .= '</ul>';
 257
 258         header('Content-Type: text/html; charset=utf-8');
 259         echo $message;
 260         exit;
 261     }
 262
 263     // Display the installation form if no existing config is found
 264     install();
 265 }
 266
 267 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 268 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 269 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 270
 271 // a token depending of deployment salt, user password, and the current ip
 272 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 273
 274 // Sniff browser language and set date format accordingly.
 275 if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
 276     autoLocale($_SERVER['HTTP_ACCEPT_LANGUAGE']);
 277 }
 278 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 279
 280 //==================================================================================================
 281 // Checking session state (i.e. is the user still logged in)
 282 //==================================================================================================
 283
 284 function setup_login_state() {
 285         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 286             return true;
 287         }
 288         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 289         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 290         if (!isset($GLOBALS['login'])) {
 291             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 292             $loginFailure = true;
 293         }
 294         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 295             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 296             !$loginFailure)
 297         {
 298             fillSessionInfo();
 299             $userIsLoggedIn = true;
 300         }
 301         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 302         if (empty($_SESSION['uid']) ||
 303             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 304             time() >= $_SESSION['expires_on'])
 305         {
 306             logout();
 307             $userIsLoggedIn = false;
 308             $loginFailure = true;
 309         }
 310         if (!empty($_SESSION['longlastingsession'])) {
 311             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 312         }
 313         else {
 314             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 315         }
 316         if (!$loginFailure) {
 317             $userIsLoggedIn = true;
 318         }
 319
 320         return $userIsLoggedIn;
 321 }
 322 $userIsLoggedIn = setup_login_state();
 323
 324 // ------------------------------------------------------------------------------------------
 325 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 326 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 327 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 328 function pubsubhub()
 329 {
 330     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 331     {
 332        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 333        $topic_url = array (
 334                        index_url($_SERVER).'?do=atom',
 335                        index_url($_SERVER).'?do=rss'
 336                     );
 337        $p->publish_update($topic_url);
 338     }
 339 }
 340
 341 // ------------------------------------------------------------------------------------------
 342 // Session management
 343
 344 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 345 function allIPs()
 346 {
 347     $ip = $_SERVER["REMOTE_ADDR"];
 348     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 349     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 350     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 351     return $ip;
 352 }
 353
 354 function fillSessionInfo() {
 355         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 356         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 357         $_SESSION['username']=$GLOBALS['login'];
 358         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 359 }
 360
 361 // Check that user/password is correct.
 362 function check_auth($login,$password)
 363 {
 364     $hash = sha1($password.$login.$GLOBALS['salt']);
 365     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 366     {   // Login/password is correct.
 367                 fillSessionInfo();
 368         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login successful');
 369         return True;
 370     }
 371     logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login failed for user '.$login);
 372     return False;
 373 }
 374
 375 // Returns true if the user is logged in.
 376 function isLoggedIn()
 377 {
 378     global $userIsLoggedIn;
 379     return $userIsLoggedIn;
 380 }
 381
 382 // Force logout.
 383 function logout() {
 384     if (isset($_SESSION)) {
 385         unset($_SESSION['uid']);
 386         unset($_SESSION['ip']);
 387         unset($_SESSION['username']);
 388         unset($_SESSION['privateonly']);
 389     }
 390     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 391 }
 392
 393
 394 // ------------------------------------------------------------------------------------------
 395 // Brute force protection system
 396 // Several consecutive failed logins will ban the IP address for 30 minutes.
 397 if (!is_file($GLOBALS['config']['IPBANS_FILENAME'])) file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export(array('FAILURES'=>array(),'BANS'=>array()),true).";\n?>");
 398 include $GLOBALS['config']['IPBANS_FILENAME'];
 399 // Signal a failed login. Will ban the IP if too many failures:
 400 function ban_loginFailed()
 401 {
 402     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 403     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 404     $gb['FAILURES'][$ip]++;
 405     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 406     {
 407         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 408         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'IP address banned from login');
 409     }
 410     $GLOBALS['IPBANS'] = $gb;
 411     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 412 }
 413
 414 // Signals a successful login. Resets failed login counter.
 415 function ban_loginOk()
 416 {
 417     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 418     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 419     $GLOBALS['IPBANS'] = $gb;
 420     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 421 }
 422
 423 // Checks if the user CAN login. If 'true', the user can try to login.
 424 function ban_canLogin()
 425 {
 426     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 427     if (isset($gb['BANS'][$ip]))
 428     {
 429         // User is banned. Check if the ban has expired:
 430         if ($gb['BANS'][$ip]<=time())
 431         {   // Ban expired, user can try to login again.
 432             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Ban lifted.');
 433             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 434             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 435             return true; // Ban has expired, user can login.
 436         }
 437         return false; // User is banned.
 438     }
 439     return true; // User is not banned.
 440 }
 441
 442 // ------------------------------------------------------------------------------------------
 443 // Process login form: Check if login/password is correct.
 444 if (isset($_POST['login']))
 445 {
 446     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 447     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 448     {   // Login/password is OK.
 449         ban_loginOk();
 450         // If user wants to keep the session cookie even after the browser closes:
 451         if (!empty($_POST['longlastingsession']))
 452         {
 453                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 454             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 455             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 456
 457             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 458             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 459             // Note: Never forget the trailing slash on the cookie path!
 460             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 461         }
 462         else // Standard session expiration (=when browser closes)
 463         {
 464             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 465             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 466             session_regenerate_id(true);
 467         }
 468
 469         // Optional redirect after login:
 470         if (isset($_GET['post'])) {
 471             $uri = '?post='. urlencode($_GET['post']);
 472             foreach (array('description', 'source', 'title') as $param) {
 473                 if (!empty($_GET[$param])) {
 474                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 475                 }
 476             }
 477             header('Location: '. $uri);
 478             exit;
 479         }
 480
 481         if (isset($_GET['edit_link'])) {
 482             header('Location: ?edit_link='. escape($_GET['edit_link']));
 483             exit;
 484         }
 485
 486         if (isset($_POST['returnurl'])) {
 487             // Prevent loops over login screen.
 488             if (strpos($_POST['returnurl'], 'do=login') === false) {
 489                 header('Location: '. generateLocation($_POST['returnurl'], $_SERVER['HTTP_HOST']));
 490                 exit;
 491             }
 492         }
 493         header('Location: ?'); exit;
 494     }
 495     else
 496     {
 497         ban_loginFailed();
 498         $redir = '&username='. $_POST['login'];
 499         if (isset($_GET['post'])) {
 500             $redir .= '&post=' . urlencode($_GET['post']);
 501             foreach (array('description', 'source', 'title') as $param) {
 502                 if (!empty($_GET[$param])) {
 503                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 504                 }
 505             }
 506         }
 507         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 508         exit;
 509     }
 510 }
 511
 512 // ------------------------------------------------------------------------------------------
 513 // Misc utility functions:
 514
 515 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 516 function return_bytes($val)
 517 {
 518     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 519     switch($last)
 520     {
 521         case 'g': $val *= 1024;
 522         case 'm': $val *= 1024;
 523         case 'k': $val *= 1024;
 524     }
 525     return $val;
 526 }
 527
 528 // Try to determine max file size for uploads (POST).
 529 // Returns an integer (in bytes)
 530 function getMaxFileSize()
 531 {
 532     $size1 = return_bytes(ini_get('post_max_size'));
 533     $size2 = return_bytes(ini_get('upload_max_filesize'));
 534     // Return the smaller of two:
 535     $maxsize = min($size1,$size2);
 536     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 537     return $maxsize;
 538 }
 539
 540 // ------------------------------------------------------------------------------------------
 541 // Token management for XSRF protection
 542 // Token should be used in any form which acts on data (create,update,delete,import...).
 543 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 544
 545 // Returns a token.
 546 function getToken()
 547 {
 548     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 549     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 550     return $rnd;
 551 }
 552
 553 // Tells if a token is OK. Using this function will destroy the token.
 554 // true=token is OK.
 555 function tokenOk($token)
 556 {
 557     if (isset($_SESSION['tokens'][$token]))
 558     {
 559         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 560         return true; // Token is OK.
 561     }
 562     return false; // Wrong token, or already used.
 563 }
 564
 565 // ------------------------------------------------------------------------------------------
 566 /* This class is in charge of building the final page.
 567    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 568    p = new pageBuilder;
 569    p.assign('myfield','myvalue');
 570    p.renderPage('mytemplate');
 571
 572 */
 573 class pageBuilder
 574 {
 575     private $tpl; // RainTPL template
 576
 577     function __construct()
 578     {
 579         $this->tpl = false;
 580     }
 581
 582     /**
 583      * Initialize all default tpl tags.
 584      */
 585     private function initialize()
 586     {
 587         $this->tpl = new RainTPL;
 588
 589         try {
 590             $version = ApplicationUtils::checkUpdate(
 591                 shaarli_version,
 592                 $GLOBALS['config']['UPDATECHECK_FILENAME'],
 593                 $GLOBALS['config']['UPDATECHECK_INTERVAL'],
 594                 $GLOBALS['config']['ENABLE_UPDATECHECK'],
 595                 isLoggedIn(),
 596                 $GLOBALS['config']['UPDATECHECK_BRANCH']
 597             );
 598             $this->tpl->assign('newVersion', escape($version));
 599             $this->tpl->assign('versionError', '');
 600
 601         } catch (Exception $exc) {
 602             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], $exc->getMessage());
 603             $this->tpl->assign('newVersion', '');
 604             $this->tpl->assign('versionError', escape($exc->getMessage()));
 605         }
 606
 607         $this->tpl->assign('feedurl', escape(index_url($_SERVER)));
 608         $searchcrits = ''; // Search criteria
 609         if (!empty($_GET['searchtags'])) {
 610             $searchcrits .= '&searchtags=' . urlencode($_GET['searchtags']);
 611         }
 612         if (!empty($_GET['searchterm'])) {
 613             $searchcrits .= '&searchterm=' . urlencode($_GET['searchterm']);
 614         }
 615         $this->tpl->assign('searchcrits', $searchcrits);
 616         $this->tpl->assign('source', index_url($_SERVER));
 617         $this->tpl->assign('version', shaarli_version);
 618         $this->tpl->assign('scripturl', index_url($_SERVER));
 619         $this->tpl->assign('pagetitle', 'Shaarli');
 620         $this->tpl->assign('privateonly', !empty($_SESSION['privateonly'])); // Show only private links?
 621         if (!empty($GLOBALS['title'])) {
 622             $this->tpl->assign('pagetitle', $GLOBALS['title']);
 623         }
 624         if (!empty($GLOBALS['titleLink'])) {
 625             $this->tpl->assign('titleLink', $GLOBALS['titleLink']);
 626         }
 627         if (!empty($GLOBALS['pagetitle'])) {
 628             $this->tpl->assign('pagetitle', $GLOBALS['pagetitle']);
 629         }
 630         $this->tpl->assign('shaarlititle', empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title']);
 631         if (!empty($GLOBALS['plugin_errors'])) {
 632             $this->tpl->assign('plugin_errors', $GLOBALS['plugin_errors']);
 633         }
 634     }
 635
 636     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 637     public function assign($what,$where)
 638     {
 639         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 640         $this->tpl->assign($what,$where);
 641     }
 642
 643     /**
 644      * Assign an array of data to the template builder.
 645      *
 646      * @param array $data Data to assign.
 647      *
 648      * @return false if invalid data.
 649      */
 650     public function assignAll($data)
 651     {
 652         // Lazy initialization
 653         if ($this->tpl === false) {
 654             $this->initialize();
 655         }
 656
 657         if (empty($data) || !is_array($data)){
 658             return false;
 659         }
 660
 661         foreach ($data as $key => $value) {
 662             $this->assign($key, $value);
 663         }
 664     }
 665
 666     // Render a specific page (using a template).
 667     // e.g. pb.renderPage('picwall')
 668     public function renderPage($page)
 669     {
 670         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 671         $this->tpl->draw($page);
 672     }
 673
 674     /**
 675     * Render a 404 page (uses the template : tpl/404.tpl)
 676     *
 677     * usage : $PAGE->render404('The link was deleted')
 678     * @param string $message A messate to display what is not found
 679     */
 680     public function render404($message='The page you are trying to reach does not exist or has been deleted.') {
 681         header($_SERVER['SERVER_PROTOCOL'] . ' 404 Not Found');
 682         $this->tpl->assign('error_message', $message);
 683         $this->renderPage('404');
 684     }
 685 }
 686
 687 // ------------------------------------------------------------------------------------------
 688 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 689 // Gives the last 7 days (which have links).
 690 // This RSS feed cannot be filtered.
 691 function showDailyRSS() {
 692     // Cache system
 693     $query = $_SERVER["QUERY_STRING"];
 694     $cache = new CachedPage(
 695         $GLOBALS['config']['PAGECACHE'],
 696         page_url($_SERVER),
 697         startsWith($query,'do=dailyrss') && !isLoggedIn()
 698     );
 699     $cached = $cache->cachedVersion();
 700     if (!empty($cached)) {
 701         echo $cached;
 702         exit;
 703     }
 704
 705     // If cached was not found (or not usable), then read the database and build the response:
 706     // Read links from database (and filter private links if used it not logged in).
 707     $LINKSDB = new LinkDB(
 708         $GLOBALS['config']['DATASTORE'],
 709         isLoggedIn(),
 710         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 711         $GLOBALS['redirector'],
 712         $GLOBALS['config']['REDIRECTOR_URLENCODE']
 713     );
 714
 715     /* Some Shaarlies may have very few links, so we need to look
 716        back in time (rsort()) until we have enough days ($nb_of_days).
 717     */
 718     $linkdates = array();
 719     foreach ($LINKSDB as $linkdate => $value) {
 720         $linkdates[] = $linkdate;
 721     }
 722     rsort($linkdates);
 723     $nb_of_days = 7; // We take 7 days.
 724     $today = Date('Ymd');
 725     $days = array();
 726
 727     foreach ($linkdates as $linkdate) {
 728         $day = substr($linkdate, 0, 8); // Extract day (without time)
 729         if (strcmp($day,$today) < 0) {
 730             if (empty($days[$day])) {
 731                 $days[$day] = array();
 732             }
 733             $days[$day][] = $linkdate;
 734         }
 735
 736         if (count($days) > $nb_of_days) {
 737             break; // Have we collected enough days?
 738         }
 739     }
 740
 741     // Build the RSS feed.
 742     header('Content-Type: application/rss+xml; charset=utf-8');
 743     $pageaddr = escape(index_url($_SERVER));
 744     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 745     echo '<channel>';
 746     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 747     echo '<link>'. $pageaddr .'</link>';
 748     echo '<description>Daily shared links</description>';
 749     echo '<language>en-en</language>';
 750     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 751
 752     // For each day.
 753     foreach ($days as $day => $linkdates) {
 754         $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 755         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 756
 757         // Build the HTML body of this RSS entry.
 758         $html = '';
 759         $href = '';
 760         $links = array();
 761
 762         // We pre-format some fields for proper output.
 763         foreach ($linkdates as $linkdate) {
 764             $l = $LINKSDB[$linkdate];
 765             $l['formatedDescription'] = format_description($l['description'], $GLOBALS['redirector']);
 766             $l['thumbnail'] = thumbnail($l['url']);
 767             $l_date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $l['linkdate']);
 768             $l['timestamp'] = $l_date->getTimestamp();
 769             if (startsWith($l['url'], '?')) {
 770                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 771             }
 772             $links[$linkdate] = $l;
 773         }
 774
 775         // Then build the HTML for this day:
 776         $tpl = new RainTPL;
 777         $tpl->assign('title', $GLOBALS['title']);
 778         $tpl->assign('daydate', $dayDate->getTimestamp());
 779         $tpl->assign('absurl', $absurl);
 780         $tpl->assign('links', $links);
 781         $tpl->assign('rssdate', escape($dayDate->format(DateTime::RSS)));
 782         $html = $tpl->draw('dailyrss', $return_string=true);
 783
 784         echo $html . PHP_EOL;
 785     }
 786     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
 787
 788     $cache->cache(ob_get_contents());
 789     ob_end_flush();
 790     exit;
 791 }
 792
 793 /**
 794  * Show the 'Daily' page.
 795  *
 796  * @param PageBuilder $pageBuilder Template engine wrapper.
 797  * @param LinkDB $LINKSDB LinkDB instance.
 798  */
 799 function showDaily($pageBuilder, $LINKSDB)
 800 {
 801     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 802     if (isset($_GET['day'])) $day=$_GET['day'];
 803
 804     $days = $LINKSDB->days();
 805     $i = array_search($day,$days);
 806     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
 807     $previousday='';
 808     $nextday='';
 809     if ($i!==false)
 810     {
 811         if ($i>=1) $previousday=$days[$i-1];
 812         if ($i<count($days)-1) $nextday=$days[$i+1];
 813     }
 814
 815     try {
 816         $linksToDisplay = $LINKSDB->filterDay($day);
 817     } catch (Exception $exc) {
 818         error_log($exc);
 819         $linksToDisplay = array();
 820     }
 821
 822     // We pre-format some fields for proper output.
 823     foreach($linksToDisplay as $key=>$link)
 824     {
 825
 826         $taglist = explode(' ',$link['tags']);
 827         uasort($taglist, 'strcasecmp');
 828         $linksToDisplay[$key]['taglist']=$taglist;
 829         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $GLOBALS['redirector']);
 830         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
 831         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
 832         $linksToDisplay[$key]['timestamp'] = $date->getTimestamp();
 833     }
 834
 835     /* We need to spread the articles on 3 columns.
 836        I did not want to use a JavaScript lib like http://masonry.desandro.com/
 837        so I manually spread entries with a simple method: I roughly evaluate the
 838        height of a div according to title and description length.
 839     */
 840     $columns=array(array(),array(),array()); // Entries to display, for each column.
 841     $fill=array(0,0,0);  // Rough estimate of columns fill.
 842     foreach($linksToDisplay as $key=>$link)
 843     {
 844         // Roughly estimate length of entry (by counting characters)
 845         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
 846         // Description: 836 characters gives roughly 342 pixel height.
 847         // This is not perfect, but it's usually OK.
 848         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
 849         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
 850         // Then put in column which is the less filled:
 851         $smallest=min($fill); // find smallest value in array.
 852         $index=array_search($smallest,$fill); // find index of this smallest value.
 853         array_push($columns[$index],$link); // Put entry in this column.
 854         $fill[$index]+=$length;
 855     }
 856
 857     $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 858     $data = array(
 859         'linksToDisplay' => $linksToDisplay,
 860         'linkcount' => count($LINKSDB),
 861         'cols' => $columns,
 862         'day' => $dayDate->getTimestamp(),
 863         'previousday' => $previousday,
 864         'nextday' => $nextday,
 865     );
 866     $pluginManager = PluginManager::getInstance();
 867     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
 868
 869     foreach ($data as $key => $value) {
 870         $pageBuilder->assign($key, $value);
 871     }
 872
 873     $pageBuilder->renderPage('daily');
 874     exit;
 875 }
 876
 877 // Renders the linklist
 878 function showLinkList($PAGE, $LINKSDB) {
 879     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
 880     $PAGE->renderPage('linklist');
 881 }
 882
 883
 884 // ------------------------------------------------------------------------------------------
 885 // Render HTML page (according to URL parameters and user rights)
 886 function renderPage()
 887 {
 888     $LINKSDB = new LinkDB(
 889         $GLOBALS['config']['DATASTORE'],
 890         isLoggedIn(),
 891         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 892         $GLOBALS['redirector'],
 893         $GLOBALS['config']['REDIRECTOR_URLENCODE']
 894     );
 895
 896     $updater = new Updater(
 897         read_updates_file($GLOBALS['config']['UPDATES_FILE']),
 898         $GLOBALS,
 899         $LINKSDB,
 900         isLoggedIn()
 901     );
 902     try {
 903         $newUpdates = $updater->update();
 904         if (! empty($newUpdates)) {
 905             write_updates_file(
 906                 $GLOBALS['config']['UPDATES_FILE'],
 907                 $updater->getDoneUpdates()
 908             );
 909         }
 910     }
 911     catch(Exception $e) {
 912         die($e->getMessage());
 913     }
 914
 915     $PAGE = new pageBuilder;
 916
 917     // Determine which page will be rendered.
 918     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
 919     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
 920
 921     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
 922     // Then assign generated data to RainTPL.
 923     $common_hooks = array(
 924         'includes',
 925         'header',
 926         'footer',
 927     );
 928     $pluginManager = PluginManager::getInstance();
 929     foreach($common_hooks as $name) {
 930         $plugin_data = array();
 931         $pluginManager->executeHooks('render_' . $name, $plugin_data,
 932             array(
 933                 'target' => $targetPage,
 934                 'loggedin' => isLoggedIn()
 935             )
 936         );
 937         $PAGE->assign('plugins_' . $name, $plugin_data);
 938     }
 939
 940     // -------- Display login form.
 941     if ($targetPage == Router::$PAGE_LOGIN)
 942     {
 943         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
 944         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
 945         $PAGE->assign('token',$token);
 946         if (isset($_GET['username'])) {
 947             $PAGE->assign('username', escape($_GET['username']));
 948         }
 949         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
 950         $PAGE->renderPage('loginform');
 951         exit;
 952     }
 953     // -------- User wants to logout.
 954     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
 955     {
 956         invalidateCaches($GLOBALS['config']['PAGECACHE']);
 957         logout();
 958         header('Location: ?');
 959         exit;
 960     }
 961
 962     // -------- Picture wall
 963     if ($targetPage == Router::$PAGE_PICWALL)
 964     {
 965         // Optionally filter the results:
 966         $links = $LINKSDB->filterSearch($_GET);
 967         $linksToDisplay = array();
 968
 969         // Get only links which have a thumbnail.
 970         foreach($links as $link)
 971         {
 972             $permalink='?'.escape(smallhash($link['linkdate']));
 973             $thumb=lazyThumbnail($link['url'],$permalink);
 974             if ($thumb!='') // Only output links which have a thumbnail.
 975             {
 976                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
 977                 $linksToDisplay[]=$link; // Add to array.
 978             }
 979         }
 980
 981         $data = array(
 982             'linkcount' => count($LINKSDB),
 983             'linksToDisplay' => $linksToDisplay,
 984         );
 985         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
 986
 987         foreach ($data as $key => $value) {
 988             $PAGE->assign($key, $value);
 989         }
 990
 991         $PAGE->renderPage('picwall');
 992         exit;
 993     }
 994
 995     // -------- Tag cloud
 996     if ($targetPage == Router::$PAGE_TAGCLOUD)
 997     {
 998         $tags= $LINKSDB->allTags();
 999
1000         // We sort tags alphabetically, then choose a font size according to count.
1001         // First, find max value.
1002         $maxcount = 0;
1003         foreach ($tags as $value) {
1004             $maxcount = max($maxcount, $value);
1005         }
1006
1007         // Sort tags alphabetically: case insensitive, support locale if avalaible.
1008         uksort($tags, function($a, $b) {
1009             // Collator is part of PHP intl.
1010             if (class_exists('Collator')) {
1011                 $c = new Collator(setlocale(LC_COLLATE, 0));
1012                 if (!intl_is_failure(intl_get_error_code())) {
1013                     return $c->compare($a, $b);
1014                 }
1015             }
1016             return strcasecmp($a, $b);
1017         });
1018
1019         $tagList = array();
1020         foreach($tags as $key => $value) {
1021             // Tag font size scaling:
1022             //   default 15 and 30 logarithm bases affect scaling,
1023             //   22 and 6 are arbitrary font sizes for max and min sizes.
1024             $size = log($value, 15) / log($maxcount, 30) * 2.2 + 0.8;
1025             $tagList[$key] = array(
1026                 'count' => $value,
1027                 'size' => number_format($size, 2, '.', ''),
1028             );
1029         }
1030
1031         $data = array(
1032             'linkcount' => count($LINKSDB),
1033             'tags' => $tagList,
1034         );
1035         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
1036
1037         foreach ($data as $key => $value) {
1038             $PAGE->assign($key, $value);
1039         }
1040
1041         $PAGE->renderPage('tagcloud');
1042         exit;
1043     }
1044
1045     // Daily page.
1046     if ($targetPage == Router::$PAGE_DAILY) {
1047         showDaily($PAGE, $LINKSDB);
1048     }
1049
1050     // ATOM and RSS feed.
1051     if ($targetPage == Router::$PAGE_FEED_ATOM || $targetPage == Router::$PAGE_FEED_RSS) {
1052         $feedType = $targetPage == Router::$PAGE_FEED_RSS ? FeedBuilder::$FEED_RSS : FeedBuilder::$FEED_ATOM;
1053         header('Content-Type: application/'. $feedType .'+xml; charset=utf-8');
1054
1055         // Cache system
1056         $query = $_SERVER['QUERY_STRING'];
1057         $cache = new CachedPage(
1058             $GLOBALS['config']['PAGECACHE'],
1059             page_url($_SERVER),
1060             startsWith($query,'do='. $targetPage) && !isLoggedIn()
1061         );
1062         $cached = $cache->cachedVersion();
1063         if (!empty($cached)) {
1064             echo $cached;
1065             exit;
1066         }
1067
1068         // Generate data.
1069         $feedGenerator = new FeedBuilder($LINKSDB, $feedType, $_SERVER, $_GET, isLoggedIn());
1070         $feedGenerator->setLocale(strtolower(setlocale(LC_COLLATE, 0)));
1071         $feedGenerator->setHideDates($GLOBALS['config']['HIDE_TIMESTAMPS'] && !isLoggedIn());
1072         $feedGenerator->setUsePermalinks(isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS']);
1073         if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) {
1074             $feedGenerator->setPubsubhubUrl($GLOBALS['config']['PUBSUBHUB_URL']);
1075         }
1076         $data = $feedGenerator->buildData();
1077
1078         // Process plugin hook.
1079         $pluginManager = PluginManager::getInstance();
1080         $pluginManager->executeHooks('render_feed', $data, array(
1081             'loggedin' => isLoggedIn(),
1082             'target' => $targetPage,
1083         ));
1084
1085         // Render the template.
1086         $PAGE->assignAll($data);
1087         $PAGE->renderPage('feed.'. $feedType);
1088         $cache->cache(ob_get_contents());
1089         ob_end_flush();
1090         exit;
1091     }
1092
1093     // Display openseach plugin (XML)
1094     if ($targetPage == Router::$PAGE_OPENSEARCH) {
1095         header('Content-Type: application/xml; charset=utf-8');
1096         $PAGE->assign('serverurl', index_url($_SERVER));
1097         $PAGE->renderPage('opensearch');
1098         exit;
1099     }
1100
1101     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1102     if (isset($_GET['addtag']))
1103     {
1104         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1105         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1106         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1107
1108         // Prevent redirection loop
1109         if (isset($params['addtag'])) {
1110             unset($params['addtag']);
1111         }
1112
1113         // Check if this tag is already in the search query and ignore it if it is.
1114         // Each tag is always separated by a space
1115         if (isset($params['searchtags'])) {
1116             $current_tags = explode(' ', $params['searchtags']);
1117         } else {
1118             $current_tags = array();
1119         }
1120         $addtag = true;
1121         foreach ($current_tags as $value) {
1122             if ($value === $_GET['addtag']) {
1123                 $addtag = false;
1124                 break;
1125             }
1126         }
1127         // Append the tag if necessary
1128         if (empty($params['searchtags'])) {
1129             $params['searchtags'] = trim($_GET['addtag']);
1130         }
1131         else if ($addtag) {
1132             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1133         }
1134
1135         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1136         header('Location: ?'.http_build_query($params));
1137         exit;
1138     }
1139
1140     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1141     if (isset($_GET['removetag'])) {
1142         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1143         if (empty($_SERVER['HTTP_REFERER'])) {
1144             header('Location: ?');
1145             exit;
1146         }
1147
1148         // In case browser does not send HTTP_REFERER
1149         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1150
1151         // Prevent redirection loop
1152         if (isset($params['removetag'])) {
1153             unset($params['removetag']);
1154         }
1155
1156         if (isset($params['searchtags'])) {
1157             $tags = explode(' ', $params['searchtags']);
1158             // Remove value from array $tags.
1159             $tags = array_diff($tags, array($_GET['removetag']));
1160             $params['searchtags'] = implode(' ',$tags);
1161
1162             if (empty($params['searchtags'])) {
1163                 unset($params['searchtags']);
1164             }
1165
1166             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1167         }
1168         header('Location: ?'.http_build_query($params));
1169         exit;
1170     }
1171
1172     // -------- User wants to change the number of links per page (linksperpage=...)
1173     if (isset($_GET['linksperpage'])) {
1174         if (is_numeric($_GET['linksperpage'])) {
1175             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1176         }
1177
1178         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1179         exit;
1180     }
1181
1182     // -------- User wants to see only private links (toggle)
1183     if (isset($_GET['privateonly'])) {
1184         if (empty($_SESSION['privateonly'])) {
1185             $_SESSION['privateonly'] = 1; // See only private links
1186         } else {
1187             unset($_SESSION['privateonly']); // See all links
1188         }
1189
1190         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1191         exit;
1192     }
1193
1194     // -------- Handle other actions allowed for non-logged in users:
1195     if (!isLoggedIn())
1196     {
1197         // User tries to post new link but is not logged in:
1198         // Show login screen, then redirect to ?post=...
1199         if (isset($_GET['post']))
1200         {
1201             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1202             exit;
1203         }
1204
1205                 // Same case as above except that user tried to access ?do=addlink without being logged in
1206                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1207                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1208                         header('Location: ?do=login&post=');
1209                         exit;
1210                 }
1211         showLinkList($PAGE, $LINKSDB);
1212         if (isset($_GET['edit_link'])) {
1213             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1214             exit;
1215         }
1216
1217         exit; // Never remove this one! All operations below are reserved for logged in user.
1218     }
1219
1220     // -------- All other functions are reserved for the registered user:
1221
1222     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1223     if ($targetPage == Router::$PAGE_TOOLS)
1224     {
1225         $data = array(
1226             'linkcount' => count($LINKSDB),
1227             'pageabsaddr' => index_url($_SERVER),
1228         );
1229         $pluginManager->executeHooks('render_tools', $data);
1230
1231         foreach ($data as $key => $value) {
1232             $PAGE->assign($key, $value);
1233         }
1234
1235         $PAGE->renderPage('tools');
1236         exit;
1237     }
1238
1239     // -------- User wants to change his/her password.
1240     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1241     {
1242         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1243         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1244         {
1245             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1246
1247             // Make sure old password is correct.
1248             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1249             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1250             // Save new password
1251             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1252             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1253             try {
1254                 writeConfig($GLOBALS, isLoggedIn());
1255             }
1256             catch(Exception $e) {
1257                 error_log(
1258                     'ERROR while writing config file after changing password.' . PHP_EOL .
1259                     $e->getMessage()
1260                 );
1261
1262                 // TODO: do not handle exceptions/errors in JS.
1263                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1264                 exit;
1265             }
1266             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1267             exit;
1268         }
1269         else // show the change password form.
1270         {
1271             $PAGE->assign('linkcount',count($LINKSDB));
1272             $PAGE->assign('token',getToken());
1273             $PAGE->renderPage('changepassword');
1274             exit;
1275         }
1276     }
1277
1278     // -------- User wants to change configuration
1279     if ($targetPage == Router::$PAGE_CONFIGURE)
1280     {
1281         if (!empty($_POST['title']) )
1282         {
1283             if (!tokenOk($_POST['token'])) {
1284                 die('Wrong token.'); // Go away!
1285             }
1286             $tz = 'UTC';
1287             if (!empty($_POST['continent']) && !empty($_POST['city'])
1288                 && isTimeZoneValid($_POST['continent'], $_POST['city'])
1289             ) {
1290                 $tz = $_POST['continent'] . '/' . $_POST['city'];
1291             }
1292             $GLOBALS['timezone'] = $tz;
1293             $GLOBALS['title']=$_POST['title'];
1294             $GLOBALS['titleLink']=$_POST['titleLink'];
1295             $GLOBALS['redirector']=$_POST['redirector'];
1296             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1297             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1298             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1299             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1300             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1301             try {
1302                 writeConfig($GLOBALS, isLoggedIn());
1303             }
1304             catch(Exception $e) {
1305                 error_log(
1306                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1307                     $e->getMessage()
1308                 );
1309
1310                 // TODO: do not handle exceptions/errors in JS.
1311                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1312                 exit;
1313             }
1314             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1315             exit;
1316         }
1317         else // Show the configuration form.
1318         {
1319             $PAGE->assign('linkcount',count($LINKSDB));
1320             $PAGE->assign('token',getToken());
1321             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1322             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1323             list($timezone_form, $timezone_js) = generateTimeZoneForm($GLOBALS['timezone']);
1324             $PAGE->assign('timezone_form', $timezone_form);
1325             $PAGE->assign('timezone_js',$timezone_js);
1326             $PAGE->renderPage('configure');
1327             exit;
1328         }
1329     }
1330
1331     // -------- User wants to rename a tag or delete it
1332     if ($targetPage == Router::$PAGE_CHANGETAG)
1333     {
1334         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1335             $PAGE->assign('linkcount', count($LINKSDB));
1336             $PAGE->assign('token', getToken());
1337             $PAGE->assign('tags', $LINKSDB->allTags());
1338             $PAGE->renderPage('changetag');
1339             exit;
1340         }
1341
1342         if (!tokenOk($_POST['token'])) {
1343             die('Wrong token.');
1344         }
1345
1346         // Delete a tag:
1347         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1348             $needle = trim($_POST['fromtag']);
1349             // True for case-sensitive tag search.
1350             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1351             foreach($linksToAlter as $key=>$value)
1352             {
1353                 $tags = explode(' ',trim($value['tags']));
1354                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1355                 $value['tags']=trim(implode(' ',$tags));
1356                 $LINKSDB[$key]=$value;
1357             }
1358             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1359             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1360             exit;
1361         }
1362
1363         // Rename a tag:
1364         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1365             $needle = trim($_POST['fromtag']);
1366             // True for case-sensitive tag search.
1367             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1368             foreach($linksToAlter as $key=>$value)
1369             {
1370                 $tags = explode(' ',trim($value['tags']));
1371                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1372                 $value['tags']=trim(implode(' ',$tags));
1373                 $LINKSDB[$key]=$value;
1374             }
1375             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1376             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1377             exit;
1378         }
1379     }
1380
1381     // -------- User wants to add a link without using the bookmarklet: Show form.
1382     if ($targetPage == Router::$PAGE_ADDLINK)
1383     {
1384         $PAGE->assign('linkcount',count($LINKSDB));
1385         $PAGE->renderPage('addlink');
1386         exit;
1387     }
1388
1389     // -------- User clicked the "Save" button when editing a link: Save link to database.
1390     if (isset($_POST['save_edit']))
1391     {
1392         // Go away!
1393         if (! tokenOk($_POST['token'])) {
1394             die('Wrong token.');
1395         }
1396         // Remove multiple spaces.
1397         $tags = trim(preg_replace('/\s\s+/', ' ', $_POST['lf_tags']));
1398         // Remove first '-' char in tags.
1399         $tags = preg_replace('/(^| )\-/', '$1', $tags);
1400         // Remove duplicates.
1401         $tags = implode(' ', array_unique(explode(' ', $tags)));
1402         $linkdate = $_POST['lf_linkdate'];
1403         $url = trim($_POST['lf_url']);
1404         if (! startsWith($url, 'http:') && ! startsWith($url, 'https:')
1405             && ! startsWith($url, 'ftp:') && ! startsWith($url, 'magnet:')
1406             && ! startsWith($url, '?') && ! startsWith($url, 'javascript:')
1407         ) {
1408             $url = 'http://' . $url;
1409         }
1410
1411         $link = array(
1412             'title' => trim($_POST['lf_title']),
1413             'url' => $url,
1414             'description' => $_POST['lf_description'],
1415             'private' => (isset($_POST['lf_private']) ? 1 : 0),
1416             'linkdate' => $linkdate,
1417             'tags' => str_replace(',', ' ', $tags)
1418         );
1419         // If title is empty, use the URL as title.
1420         if ($link['title'] == '') {
1421             $link['title'] = $link['url'];
1422         }
1423
1424         $pluginManager->executeHooks('save_link', $link);
1425
1426         $LINKSDB[$linkdate] = $link;
1427         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1428         pubsubhub();
1429
1430         // If we are called from the bookmarklet, we must close the popup:
1431         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1432             echo '<script>self.close();</script>';
1433             exit;
1434         }
1435
1436         $returnurl = !empty($_POST['returnurl']) ? $_POST['returnurl'] : '?';
1437         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1438         // Scroll to the link which has been edited.
1439         $location .= '#' . smallHash($_POST['lf_linkdate']);
1440         // After saving the link, redirect to the page the user was on.
1441         header('Location: '. $location);
1442         exit;
1443     }
1444
1445     // -------- User clicked the "Cancel" button when editing a link.
1446     if (isset($_POST['cancel_edit']))
1447     {
1448         // If we are called from the bookmarklet, we must close the popup:
1449         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1450         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1451         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1452         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1453         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1454         exit;
1455     }
1456
1457     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1458     if (isset($_POST['delete_link']))
1459     {
1460         if (!tokenOk($_POST['token'])) die('Wrong token.');
1461         // We do not need to ask for confirmation:
1462         // - confirmation is handled by JavaScript
1463         // - we are protected from XSRF by the token.
1464         $linkdate=$_POST['lf_linkdate'];
1465
1466         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1467
1468         unset($LINKSDB[$linkdate]);
1469         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // save to disk
1470
1471         // If we are called from the bookmarklet, we must close the popup:
1472         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1473         // Pick where we're going to redirect
1474         // =============================================================
1475         // Basically, we can't redirect to where we were previously if it was a permalink
1476         // or an edit_link, because it would 404.
1477         // Cases:
1478         //    - /             : nothing in $_GET, redirect to self
1479         //    - /?page        : redirect to self
1480         //    - /?searchterm  : redirect to self (there might be other links)
1481         //    - /?searchtags  : redirect to self
1482         //    - /permalink    : redirect to / (the link does not exist anymore)
1483         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1484         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1485         // redirect is not satisfied, and only then redirect to /
1486         $location = "?";
1487         // Self redirection
1488         if (count($_GET) == 0
1489             || isset($_GET['page'])
1490             || isset($_GET['searchterm'])
1491             || isset($_GET['searchtags'])
1492         ) {
1493             if (isset($_POST['returnurl'])) {
1494                 $location = $_POST['returnurl']; // Handle redirects given by the form
1495             } else {
1496                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1497             }
1498         }
1499
1500         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1501         exit;
1502     }
1503
1504     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1505     if (isset($_GET['edit_link']))
1506     {
1507         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1508         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1509         $data = array(
1510             'linkcount' => count($LINKSDB),
1511             'link' => $link,
1512             'link_is_new' => false,
1513             'token' => getToken(),
1514             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1515             'tags' => $LINKSDB->allTags(),
1516         );
1517         $pluginManager->executeHooks('render_editlink', $data);
1518
1519         foreach ($data as $key => $value) {
1520             $PAGE->assign($key, $value);
1521         }
1522
1523         $PAGE->renderPage('editlink');
1524         exit;
1525     }
1526
1527     // -------- User want to post a new link: Display link edit form.
1528     if (isset($_GET['post'])) {
1529         $url = cleanup_url($_GET['post']);
1530
1531         $link_is_new = false;
1532         // Check if URL is not already in database (in this case, we will edit the existing link)
1533         $link = $LINKSDB->getLinkFromUrl($url);
1534         if (!$link)
1535         {
1536             $link_is_new = true;
1537             $linkdate = strval(date('Ymd_His'));
1538             // Get title if it was provided in URL (by the bookmarklet).
1539             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1540             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1541             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1542             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1543             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1544             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1545             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1546                 // Short timeout to keep the application responsive
1547                 list($headers, $content) = get_http_response($url, 4);
1548                 if (strpos($headers[0], '200 OK') !== false) {
1549                     // Retrieve charset.
1550                     $charset = get_charset($headers, $content);
1551                     // Extract title.
1552                     $title = html_extract_title($content);
1553                     // Re-encode title in utf-8 if necessary.
1554                     if (! empty($title) && strtolower($charset) != 'utf-8') {
1555                         $title = mb_convert_encoding($title, 'utf-8', $charset);
1556                     }
1557                 }
1558             }
1559
1560             if ($url == '') {
1561                 $url = '?' . smallHash($linkdate);
1562                 $title = 'Note: ';
1563             }
1564             $url = escape($url);
1565             $title = escape($title);
1566
1567             $link = array(
1568                 'linkdate' => $linkdate,
1569                 'title' => $title,
1570                 'url' => $url,
1571                 'description' => $description,
1572                 'tags' => $tags,
1573                 'private' => $private
1574             );
1575         }
1576
1577         $data = array(
1578             'linkcount' => count($LINKSDB),
1579             'link' => $link,
1580             'link_is_new' => $link_is_new,
1581             'token' => getToken(), // XSRF protection.
1582             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1583             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1584             'tags' => $LINKSDB->allTags(),
1585         );
1586         $pluginManager->executeHooks('render_editlink', $data);
1587
1588         foreach ($data as $key => $value) {
1589             $PAGE->assign($key, $value);
1590         }
1591
1592         $PAGE->renderPage('editlink');
1593         exit;
1594     }
1595
1596     // -------- Export as Netscape Bookmarks HTML file.
1597     if ($targetPage == Router::$PAGE_EXPORT) {
1598         if (empty($_GET['selection'])) {
1599             $PAGE->assign('linkcount',count($LINKSDB));
1600             $PAGE->renderPage('export');
1601             exit;
1602         }
1603
1604         // export as bookmarks_(all|private|public)_YYYYmmdd_HHMMSS.html
1605         $selection = $_GET['selection'];
1606         try {
1607             $PAGE->assign(
1608                 'links',
1609                 NetscapeBookmarkUtils::filterAndFormat($LINKSDB, $selection)
1610             );
1611         } catch (Exception $exc) {
1612             header('Content-Type: text/plain; charset=utf-8');
1613             echo $exc->getMessage();
1614             exit;
1615         }
1616         $now = new DateTime();
1617         header('Content-Type: text/html; charset=utf-8');
1618         header(
1619             'Content-disposition: attachment; filename=bookmarks_'
1620            .$selection.'_'.$now->format(LinkDB::LINK_DATE_FORMAT).'.html'
1621         );
1622         $PAGE->assign('date', $now->format(DateTime::RFC822));
1623         $PAGE->assign('eol', PHP_EOL);
1624         $PAGE->assign('selection', $selection);
1625         $PAGE->renderPage('export.bookmarks');
1626         exit;
1627     }
1628
1629     // -------- User is uploading a file for import
1630     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1631     {
1632         // If file is too big, some form field may be missing.
1633         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1634         {
1635             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1636             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1637             exit;
1638         }
1639         if (!tokenOk($_POST['token'])) die('Wrong token.');
1640         importFile($LINKSDB);
1641         exit;
1642     }
1643
1644     // -------- Show upload/import dialog:
1645     if ($targetPage == Router::$PAGE_IMPORT)
1646     {
1647         $PAGE->assign('linkcount',count($LINKSDB));
1648         $PAGE->assign('token',getToken());
1649         $PAGE->assign('maxfilesize',getMaxFileSize());
1650         $PAGE->renderPage('import');
1651         exit;
1652     }
1653
1654     // Plugin administration page
1655     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1656         $pluginMeta = $pluginManager->getPluginsMeta();
1657
1658         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1659         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1660         // Load parameters.
1661         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $GLOBALS['plugins']);
1662         uasort(
1663             $enabledPlugins,
1664             function($a, $b) { return $a['order'] - $b['order']; }
1665         );
1666         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1667
1668         $PAGE->assign('enabledPlugins', $enabledPlugins);
1669         $PAGE->assign('disabledPlugins', $disabledPlugins);
1670         $PAGE->renderPage('pluginsadmin');
1671         exit;
1672     }
1673
1674     // Plugin administration form action
1675     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1676         try {
1677             if (isset($_POST['parameters_form'])) {
1678                 unset($_POST['parameters_form']);
1679                 foreach ($_POST as $param => $value) {
1680                     $GLOBALS['plugins'][$param] = escape($value);
1681                 }
1682             }
1683             else {
1684                 $GLOBALS['config']['ENABLED_PLUGINS'] = save_plugin_config($_POST);
1685             }
1686             writeConfig($GLOBALS, isLoggedIn());
1687         }
1688         catch (Exception $e) {
1689             error_log(
1690                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1691                 $e->getMessage()
1692             );
1693
1694             // TODO: do not handle exceptions/errors in JS.
1695             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do='. Router::$PAGE_PLUGINSADMIN .'\';</script>';
1696             exit;
1697         }
1698         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1699         exit;
1700     }
1701
1702     // -------- Otherwise, simply display search form and links:
1703     showLinkList($PAGE, $LINKSDB);
1704     exit;
1705 }
1706
1707 // -----------------------------------------------------------------------------------------------
1708 // Process the import file form.
1709 function importFile($LINKSDB)
1710 {
1711     if (!isLoggedIn()) { die('Not allowed.'); }
1712
1713     $filename=$_FILES['filetoupload']['name'];
1714     $filesize=$_FILES['filetoupload']['size'];
1715     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1716     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1717     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1718     $import_count=0;
1719
1720     // Sniff file type:
1721     $type='unknown';
1722     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1723
1724     // Then import the bookmarks.
1725     if ($type=='netscape')
1726     {
1727         // This is a standard Netscape-style bookmark file.
1728         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1729         foreach(explode('<DT>',$data) as $html) // explode is very fast
1730         {
1731             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1732             $d = explode('<DD>',$html);
1733             if (startswith($d[0],'<A '))
1734             {
1735                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1736                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1737                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1738                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1739                 $raw_add_date=0;
1740                 foreach($matches as $m)
1741                 {
1742                     $attr=$m[1]; $value=$m[2];
1743                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1744                     elseif ($attr=='ADD_DATE')
1745                     {
1746                         $raw_add_date=intval($value);
1747                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1748                     }
1749                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1750                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1751                 }
1752                 if ($link['url']!='')
1753                 {
1754                     if ($private==1) $link['private']=1;
1755                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1756                     if ($dblink==false)
1757                     {  // Link not in database, let's import it...
1758                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1759
1760                        // Make sure date/time is not already used by another link.
1761                        // (Some bookmark files have several different links with the same ADD_DATE)
1762                        // We increment date by 1 second until we find a date which is not used in DB.
1763                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1764                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1765                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1766                        $LINKSDB[$link['linkdate']] = $link;
1767                        $import_count++;
1768                     }
1769                     else // Link already present in database.
1770                     {
1771                         if ($overwrite)
1772                         {   // If overwrite is required, we import link data, except date/time.
1773                             $link['linkdate']=$dblink['linkdate'];
1774                             $LINKSDB[$link['linkdate']] = $link;
1775                             $import_count++;
1776                         }
1777                     }
1778
1779                 }
1780             }
1781         }
1782         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1783
1784         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1785     }
1786     else
1787     {
1788         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1789     }
1790 }
1791
1792 /**
1793  * Template for the list of links (<div id="linklist">)
1794  * This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1795  *
1796  * @param pageBuilder $PAGE    pageBuilder instance.
1797  * @param LinkDB      $LINKSDB LinkDB instance.
1798  */
1799 function buildLinkList($PAGE,$LINKSDB)
1800 {
1801     // Used in templates
1802     $searchtags = !empty($_GET['searchtags']) ? escape($_GET['searchtags']) : '';
1803     $searchterm = !empty($_GET['searchterm']) ? escape($_GET['searchterm']) : '';
1804
1805     // Smallhash filter
1806     if (! empty($_SERVER['QUERY_STRING'])
1807         && preg_match('/^[a-zA-Z0-9-_@]{6}($|&|#)/', $_SERVER['QUERY_STRING'])) {
1808         try {
1809             $linksToDisplay = $LINKSDB->filterHash($_SERVER['QUERY_STRING']);
1810         } catch (LinkNotFoundException $e) {
1811             $PAGE->render404($e->getMessage());
1812             exit;
1813         }
1814     } else {
1815         // Filter links according search parameters.
1816         $privateonly = !empty($_SESSION['privateonly']);
1817         $linksToDisplay = $LINKSDB->filterSearch($_GET, false, $privateonly);
1818     }
1819
1820     // ---- Handle paging.
1821     $keys = array();
1822     foreach ($linksToDisplay as $key => $value) {
1823         $keys[] = $key;
1824     }
1825
1826     // If there is only a single link, we change on-the-fly the title of the page.
1827     if (count($linksToDisplay) == 1) {
1828         $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1829     }
1830
1831     // Select articles according to paging.
1832     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1833     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1834     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1835     $page = $page < 1 ? 1 : $page;
1836     $page = $page > $pagecount ? $pagecount : $page;
1837     // Start index.
1838     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1839     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1840     $linkDisp = array();
1841     while ($i<$end && $i<count($keys))
1842     {
1843         $link = $linksToDisplay[$keys[$i]];
1844         $link['description'] = format_description($link['description'], $GLOBALS['redirector']);
1845         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
1846         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
1847         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
1848         $link['timestamp'] = $date->getTimestamp();
1849         $taglist = explode(' ', $link['tags']);
1850         uasort($taglist, 'strcasecmp');
1851         $link['taglist'] = $taglist;
1852         $link['shorturl'] = smallHash($link['linkdate']);
1853         // Check for both signs of a note: starting with ? and 7 chars long.
1854         if ($link['url'][0] === '?' &&
1855             strlen($link['url']) === 7) {
1856             $link['url'] = index_url($_SERVER) . $link['url'];
1857         }
1858
1859         $linkDisp[$keys[$i]] = $link;
1860         $i++;
1861     }
1862
1863     // Compute paging navigation
1864     $searchtagsUrl = empty($searchtags) ? '' : '&searchtags=' . urlencode($searchtags);
1865     $searchtermUrl = empty($searchterm) ? '' : '&searchterm=' . urlencode($searchterm);
1866     $previous_page_url = '';
1867     if ($i != count($keys)) {
1868         $previous_page_url = '?page=' . ($page+1) . $searchtermUrl . $searchtagsUrl;
1869     }
1870     $next_page_url='';
1871     if ($page>1) {
1872         $next_page_url = '?page=' . ($page-1) . $searchtermUrl . $searchtagsUrl;
1873     }
1874
1875     $token = isLoggedIn() ? getToken() : '';
1876
1877     // Fill all template fields.
1878     $data = array(
1879         'linkcount' => count($LINKSDB),
1880         'previous_page_url' => $previous_page_url,
1881         'next_page_url' => $next_page_url,
1882         'page_current' => $page,
1883         'page_max' => $pagecount,
1884         'result_count' => count($linksToDisplay),
1885         'search_term' => $searchterm,
1886         'search_tags' => $searchtags,
1887         'redirector' => empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'],  // Optional redirector URL.
1888         'token' => $token,
1889         'links' => $linkDisp,
1890         'tags' => $LINKSDB->allTags(),
1891     );
1892     // FIXME! temporary fix - see #399.
1893     if (!empty($GLOBALS['pagetitle']) && count($linkDisp) == 1) {
1894         $data['pagetitle'] = $GLOBALS['pagetitle'];
1895     }
1896
1897     $pluginManager = PluginManager::getInstance();
1898     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
1899
1900     foreach ($data as $key => $value) {
1901         $PAGE->assign($key, $value);
1902     }
1903
1904     return;
1905 }
1906
1907 // Compute the thumbnail for a link.
1908 //
1909 // With a link to the original URL.
1910 // Understands various services (youtube.com...)
1911 // Input: $url = URL for which the thumbnail must be found.
1912 //        $href = if provided, this URL will be followed instead of $url
1913 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1914 // Some of them may be missing.
1915 // Return an empty array if no thumbnail available.
1916 function computeThumbnail($url,$href=false)
1917 {
1918     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
1919     if ($href==false) $href=$url;
1920
1921     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1922     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1923     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1924     $domain = parse_url($url,PHP_URL_HOST);
1925     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1926     {
1927         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1928         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1929                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1930     }
1931     if ($domain=='youtu.be') // Youtube short links
1932     {
1933         $path = parse_url($url,PHP_URL_PATH);
1934         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1935                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1936     }
1937     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1938     {
1939         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1940         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1941                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1942     }
1943
1944     if ($domain=='imgur.com')
1945     {
1946         $path = parse_url($url,PHP_URL_PATH);
1947         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1948         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1949                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1950         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1951                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1952
1953         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1954                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1955     }
1956     if ($domain=='i.imgur.com')
1957     {
1958         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1959         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1960                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1961     }
1962     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1963     {
1964         if (strpos($url,'dailymotion.com/video/')!==false)
1965         {
1966             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1967             return array('src'=>$thumburl,
1968                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1969         }
1970     }
1971     if (endsWith($domain,'.imageshack.us'))
1972     {
1973         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1974         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1975         {
1976             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1977             return array('src'=>$thumburl,
1978                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1979         }
1980     }
1981
1982     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1983     // So we deport the thumbnail generation in order not to slow down page generation
1984     // (and we also cache the thumbnail)
1985
1986     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1987
1988     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1989         || $domain=='vimeo.com'
1990         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1991         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1992     )
1993     {
1994         if ($domain=='vimeo.com')
1995         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1996             $path = parse_url($url,PHP_URL_PATH);
1997             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1998         }
1999         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2000         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
2001             $path = parse_url($url,PHP_URL_PATH);
2002             if (!preg_match('!/\d+.+?!',$path)) return array();
2003         }
2004         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2005         {   // Make sure this TED URL points to a video (/talks/...)
2006             $path = parse_url($url,PHP_URL_PATH);
2007             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
2008         }
2009         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2010         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2011                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2012     }
2013
2014     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
2015     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
2016     // But using the extension will do.
2017     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2018     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2019     {
2020         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2021         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2022                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2023     }
2024     return array(); // No thumbnail.
2025
2026 }
2027
2028
2029 // Returns the HTML code to display a thumbnail for a link
2030 // with a link to the original URL.
2031 // Understands various services (youtube.com...)
2032 // Input: $url = URL for which the thumbnail must be found.
2033 //        $href = if provided, this URL will be followed instead of $url
2034 // Returns '' if no thumbnail available.
2035 function thumbnail($url,$href=false)
2036 {
2037     $t = computeThumbnail($url,$href);
2038     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2039
2040     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
2041     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2042     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2043     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2044     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2045     $html.='></a>';
2046     return $html;
2047 }
2048
2049 // Returns the HTML code to display a thumbnail for a link
2050 // for the picture wall (using lazy image loading)
2051 // Understands various services (youtube.com...)
2052 // Input: $url = URL for which the thumbnail must be found.
2053 //        $href = if provided, this URL will be followed instead of $url
2054 // Returns '' if no thumbnail available.
2055 function lazyThumbnail($url,$href=false)
2056 {
2057     $t = computeThumbnail($url,$href);
2058     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2059
2060     $html='<a href="'.escape($t['href']).'">';
2061
2062     // Lazy image
2063     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
2064
2065     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2066     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2067     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2068     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2069     $html.='>';
2070
2071     // No-JavaScript fallback.
2072     $html.='<noscript><img src="'.escape($t['src']).'"';
2073     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2074     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2075     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2076     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2077     $html.='></noscript></a>';
2078
2079     return $html;
2080 }
2081
2082
2083 // -----------------------------------------------------------------------------------------------
2084 // Installation
2085 // This function should NEVER be called if the file data/config.php exists.
2086 function install()
2087 {
2088     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2089     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2090
2091
2092     // This part makes sure sessions works correctly.
2093     // (Because on some hosts, session.save_path may not be set correctly,
2094     // or we may not have write access to it.)
2095     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2096     {   // Step 2: Check if data in session is correct.
2097         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2098         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2099         echo 'It currently points to '.session_save_path().'<br>';
2100         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2101         echo '<br><a href="?">Click to try again.</a></pre>';
2102         die;
2103     }
2104     if (!isset($_SESSION['session_tested']))
2105     {   // Step 1 : Try to store data in session and reload page.
2106         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2107         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
2108     }
2109     if (isset($_GET['test_session']))
2110     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2111         header('Location: '.index_url($_SERVER));
2112     }
2113
2114
2115     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2116     {
2117         $tz = 'UTC';
2118         if (!empty($_POST['continent']) && !empty($_POST['city'])
2119             && isTimeZoneValid($_POST['continent'], $_POST['city'])
2120         ) {
2121             $tz = $_POST['continent'].'/'.$_POST['city'];
2122         }
2123         $GLOBALS['timezone'] = $tz;
2124         // Everything is ok, let's create config file.
2125         $GLOBALS['login'] = $_POST['setlogin'];
2126         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2127         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2128         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(index_url($_SERVER)) : $_POST['title'] );
2129         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2130         try {
2131             writeConfig($GLOBALS, isLoggedIn());
2132         }
2133         catch(Exception $e) {
2134             error_log(
2135                     'ERROR while writing config file after installation.' . PHP_EOL .
2136                     $e->getMessage()
2137                 );
2138
2139             // TODO: do not handle exceptions/errors in JS.
2140             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2141             exit;
2142         }
2143         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2144         exit;
2145     }
2146
2147     // Display config form:
2148     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2149     $timezone_html = '';
2150     if ($timezone_form != '') {
2151         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2152     }
2153
2154     $PAGE = new pageBuilder;
2155     $PAGE->assign('timezone_html',$timezone_html);
2156     $PAGE->assign('timezone_js',$timezone_js);
2157     $PAGE->renderPage('install');
2158     exit;
2159 }
2160
2161 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2162    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2163    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2164    This function is called by passing the URL:
2165    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2166    [URL] is the URL of the link (e.g. a flickr page)
2167    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2168    The function below will fetch the image from the webservice and store it in the cache.
2169 */
2170 function genThumbnail()
2171 {
2172     // Make sure the parameters in the URL were generated by us.
2173     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2174     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2175
2176     // Let's see if we don't already have the image for this URL in the cache.
2177     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2178     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2179     {   // We have the thumbnail, just serve it:
2180         header('Content-Type: image/jpeg');
2181         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2182         return;
2183     }
2184     // We may also serve a blank image (if service did not respond)
2185     $blankname=hash('sha1',$_GET['url']).'.gif';
2186     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2187     {
2188         header('Content-Type: image/gif');
2189         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2190         return;
2191     }
2192
2193     // Otherwise, generate the thumbnail.
2194     $url = $_GET['url'];
2195     $domain = parse_url($url,PHP_URL_HOST);
2196
2197     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2198     {
2199         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2200         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2201
2202         // Is this a link to an image, or to a flickr page ?
2203         $imageurl='';
2204         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2205         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2206             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2207             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2208         }
2209         else // This is a flickr page (html)
2210         {
2211             // Get the flickr html page.
2212             list($headers, $content) = get_http_response($url, 20);
2213             if (strpos($headers[0], '200 OK') !== false)
2214             {
2215                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2216                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2217                 if (!empty($matches[1])) $imageurl=$matches[1];
2218
2219                 // In albums (and some other pages), the link rel="image_src" is not provided,
2220                 // but flickr provides:
2221                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2222                 if ($imageurl=='')
2223                 {
2224                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2225                     if (!empty($matches[1])) $imageurl=$matches[1];
2226                 }
2227             }
2228         }
2229
2230         if ($imageurl!='')
2231         {   // Let's download the image.
2232             // Image is 240x120, so 10 seconds to download should be enough.
2233             list($headers, $content) = get_http_response($imageurl, 10);
2234             if (strpos($headers[0], '200 OK') !== false) {
2235                 // Save image to cache.
2236                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/' . $thumbname, $content);
2237                 header('Content-Type: image/jpeg');
2238                 echo $content;
2239                 return;
2240             }
2241         }
2242     }
2243
2244     elseif ($domain=='vimeo.com' )
2245     {
2246         // This is more complex: we have to perform a HTTP request, then parse the result.
2247         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2248         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2249         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2250         if (strpos($headers[0], '200 OK') !== false) {
2251             $t = unserialize($content);
2252             $imageurl = $t[0]['thumbnail_medium'];
2253             // Then we download the image and serve it to our client.
2254             list($headers, $content) = get_http_response($imageurl, 10);
2255             if (strpos($headers[0], '200 OK') !== false) {
2256                 // Save image to cache.
2257                 file_put_contents($GLOBALS['config']['CACHEDIR'] . '/' . $thumbname, $content);
2258                 header('Content-Type: image/jpeg');
2259                 echo $content;
2260                 return;
2261             }
2262         }
2263     }
2264
2265     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2266     {
2267         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2268         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2269         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2270         list($headers, $content) = get_http_response($url, 5);
2271         if (strpos($headers[0], '200 OK') !== false) {
2272             // Extract the link to the thumbnail
2273             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2274             if (!empty($matches[1]))
2275             {   // Let's download the image.
2276                 $imageurl=$matches[1];
2277                 // No control on image size, so wait long enough
2278                 list($headers, $content) = get_http_response($imageurl, 20);
2279                 if (strpos($headers[0], '200 OK') !== false) {
2280                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2281                     file_put_contents($filepath, $content); // Save image to cache.
2282                     if (resizeImage($filepath))
2283                     {
2284                         header('Content-Type: image/jpeg');
2285                         echo file_get_contents($filepath);
2286                         return;
2287                     }
2288                 }
2289             }
2290         }
2291     }
2292
2293     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2294     {
2295         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2296         // http://xkcd.com/327/
2297         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2298         list($headers, $content) = get_http_response($url, 5);
2299         if (strpos($headers[0], '200 OK') !== false) {
2300             // Extract the link to the thumbnail
2301             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2302             if (!empty($matches[1]))
2303             {   // Let's download the image.
2304                 $imageurl=$matches[1];
2305                 // No control on image size, so wait long enough
2306                 list($headers, $content) = get_http_response($imageurl, 20);
2307                 if (strpos($headers[0], '200 OK') !== false) {
2308                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2309                     // Save image to cache.
2310                     file_put_contents($filepath, $content);
2311                     if (resizeImage($filepath))
2312                     {
2313                         header('Content-Type: image/jpeg');
2314                         echo file_get_contents($filepath);
2315                         return;
2316                     }
2317                 }
2318             }
2319         }
2320     }
2321
2322     else
2323     {
2324         // For all other domains, we try to download the image and make a thumbnail.
2325         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2326         list($headers, $content) = get_http_response($url, 30);
2327         if (strpos($headers[0], '200 OK') !== false) {
2328             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2329             // Save image to cache.
2330             file_put_contents($filepath, $content);
2331             if (resizeImage($filepath))
2332             {
2333                 header('Content-Type: image/jpeg');
2334                 echo file_get_contents($filepath);
2335                 return;
2336             }
2337         }
2338     }
2339
2340
2341     // Otherwise, return an empty image (8x8 transparent gif)
2342     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2343     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2344     header('Content-Type: image/gif');
2345     echo $blankgif;
2346 }
2347
2348 // Make a thumbnail of the image (to width: 120 pixels)
2349 // Returns true if success, false otherwise.
2350 function resizeImage($filepath)
2351 {
2352     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2353
2354     // Trick: some stupid people rename GIF as JPEG... or else.
2355     // So we really try to open each image type whatever the extension is.
2356     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2357     $im=false;
2358     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2359     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2360     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2361     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2362     $w = imagesx($im);
2363     $h = imagesy($im);
2364     $ystart = 0; $yheight=$h;
2365     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2366     $nw = 120;   // Desired width
2367     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2368     // Resize image:
2369     $im2 = imagecreatetruecolor($nw,$nh);
2370     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2371     imageinterlace($im2,true); // For progressive JPEG.
2372     $tempname=$filepath.'_TEMP.jpg';
2373     imagejpeg($im2, $tempname, 90);
2374     imagedestroy($im);
2375     imagedestroy($im2);
2376     unlink($filepath);
2377     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2378     return true;
2379 }
2380
2381 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2382 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2383 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2384 renderPage();
2385 ?>