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/TimeZone.php';
 165 require_once 'application/Url.php';
 166 require_once 'application/Utils.php';
 167 require_once 'application/Config.php';
 168 require_once 'application/PluginManager.php';
 169 require_once 'application/Router.php';
 170 require_once 'application/Updater.php';
 171
 172 // Ensure the PHP version is supported
 173 try {
 174     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
 175 } catch(Exception $exc) {
 176     header('Content-Type: text/plain; charset=utf-8');
 177     echo $exc->getMessage();
 178     exit;
 179 }
 180
 181 // Force cookie path (but do not change lifetime)
 182 $cookie = session_get_cookie_params();
 183 $cookiedir = '';
 184 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
 185     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
 186 }
 187 // Set default cookie expiration and path.
 188 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 189 // Set session parameters on server side.
 190 // If the user does not access any page within this time, his/her session is considered expired.
 191 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 192 // Use cookies to store session.
 193 ini_set('session.use_cookies', 1);
 194 // Force cookies for session (phpsessionID forbidden in URL).
 195 ini_set('session.use_only_cookies', 1);
 196 // Prevent PHP form using sessionID in URL if cookies are disabled.
 197 ini_set('session.use_trans_sid', false);
 198
 199 session_name('shaarli');
 200 // Start session if needed (Some server auto-start sessions).
 201 if (session_id() == '') {
 202     session_start();
 203 }
 204
 205 // Regenerate session ID if invalid or not defined in cookie.
 206 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 207     session_regenerate_id(true);
 208     $_COOKIE['shaarli'] = session_id();
 209 }
 210
 211 include "inc/rain.tpl.class.php"; //include Rain TPL
 212 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
 213 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
 214
 215 $pluginManager = PluginManager::getInstance();
 216 $pluginManager->load($GLOBALS['config']['ENABLED_PLUGINS']);
 217
 218 ob_start();  // Output buffering for the page cache.
 219
 220
 221 // In case stupid admin has left magic_quotes enabled in php.ini:
 222 if (get_magic_quotes_gpc())
 223 {
 224     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 225     $_POST = array_map('stripslashes_deep', $_POST);
 226     $_GET = array_map('stripslashes_deep', $_GET);
 227     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 228 }
 229
 230 // Prevent caching on client side or proxy: (yes, it's ugly)
 231 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 232 header("Cache-Control: no-store, no-cache, must-revalidate");
 233 header("Cache-Control: post-check=0, pre-check=0", false);
 234 header("Pragma: no-cache");
 235
 236 // Handling of old config file which do not have the new parameters.
 237 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(index_url($_SERVER));
 238 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 239 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 240 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 241 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 242 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 243 // I really need to rewrite Shaarli with a proper configuation manager.
 244
 245 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 246     // Ensure Shaarli has proper access to its resources
 247     $errors = ApplicationUtils::checkResourcePermissions($GLOBALS['config']);
 248
 249     if ($errors != array()) {
 250         $message = '<p>Insufficient permissions:</p><ul>';
 251
 252         foreach ($errors as $error) {
 253             $message .= '<li>'.$error.'</li>';
 254         }
 255         $message .= '</ul>';
 256
 257         header('Content-Type: text/html; charset=utf-8');
 258         echo $message;
 259         exit;
 260     }
 261
 262     // Display the installation form if no existing config is found
 263     install();
 264 }
 265
 266 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 267 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 268 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 269
 270 // a token depending of deployment salt, user password, and the current ip
 271 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 272
 273 // Sniff browser language and set date format accordingly.
 274 if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
 275     autoLocale($_SERVER['HTTP_ACCEPT_LANGUAGE']);
 276 }
 277 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 278
 279 //==================================================================================================
 280 // Checking session state (i.e. is the user still logged in)
 281 //==================================================================================================
 282
 283 function setup_login_state() {
 284         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 285             return true;
 286         }
 287         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 288         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 289         if (!isset($GLOBALS['login'])) {
 290             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 291             $loginFailure = true;
 292         }
 293         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 294             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 295             !$loginFailure)
 296         {
 297             fillSessionInfo();
 298             $userIsLoggedIn = true;
 299         }
 300         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 301         if (empty($_SESSION['uid']) ||
 302             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 303             time() >= $_SESSION['expires_on'])
 304         {
 305             logout();
 306             $userIsLoggedIn = false;
 307             $loginFailure = true;
 308         }
 309         if (!empty($_SESSION['longlastingsession'])) {
 310             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 311         }
 312         else {
 313             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 314         }
 315         if (!$loginFailure) {
 316             $userIsLoggedIn = true;
 317         }
 318
 319         return $userIsLoggedIn;
 320 }
 321 $userIsLoggedIn = setup_login_state();
 322
 323 // ------------------------------------------------------------------------------------------
 324 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 325 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 326 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 327 function pubsubhub()
 328 {
 329     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 330     {
 331        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 332        $topic_url = array (
 333                        index_url($_SERVER).'?do=atom',
 334                        index_url($_SERVER).'?do=rss'
 335                     );
 336        $p->publish_update($topic_url);
 337     }
 338 }
 339
 340 // ------------------------------------------------------------------------------------------
 341 // Session management
 342
 343 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 344 function allIPs()
 345 {
 346     $ip = $_SERVER["REMOTE_ADDR"];
 347     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 348     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 349     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 350     return $ip;
 351 }
 352
 353 function fillSessionInfo() {
 354         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 355         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 356         $_SESSION['username']=$GLOBALS['login'];
 357         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 358 }
 359
 360 // Check that user/password is correct.
 361 function check_auth($login,$password)
 362 {
 363     $hash = sha1($password.$login.$GLOBALS['salt']);
 364     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 365     {   // Login/password is correct.
 366                 fillSessionInfo();
 367         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login successful');
 368         return True;
 369     }
 370     logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login failed for user '.$login);
 371     return False;
 372 }
 373
 374 // Returns true if the user is logged in.
 375 function isLoggedIn()
 376 {
 377     global $userIsLoggedIn;
 378     return $userIsLoggedIn;
 379 }
 380
 381 // Force logout.
 382 function logout() {
 383     if (isset($_SESSION)) {
 384         unset($_SESSION['uid']);
 385         unset($_SESSION['ip']);
 386         unset($_SESSION['username']);
 387         unset($_SESSION['privateonly']);
 388     }
 389     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 390 }
 391
 392
 393 // ------------------------------------------------------------------------------------------
 394 // Brute force protection system
 395 // Several consecutive failed logins will ban the IP address for 30 minutes.
 396 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?>");
 397 include $GLOBALS['config']['IPBANS_FILENAME'];
 398 // Signal a failed login. Will ban the IP if too many failures:
 399 function ban_loginFailed()
 400 {
 401     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 402     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 403     $gb['FAILURES'][$ip]++;
 404     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 405     {
 406         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 407         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'IP address banned from login');
 408     }
 409     $GLOBALS['IPBANS'] = $gb;
 410     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 411 }
 412
 413 // Signals a successful login. Resets failed login counter.
 414 function ban_loginOk()
 415 {
 416     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 417     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 418     $GLOBALS['IPBANS'] = $gb;
 419     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 420 }
 421
 422 // Checks if the user CAN login. If 'true', the user can try to login.
 423 function ban_canLogin()
 424 {
 425     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 426     if (isset($gb['BANS'][$ip]))
 427     {
 428         // User is banned. Check if the ban has expired:
 429         if ($gb['BANS'][$ip]<=time())
 430         {   // Ban expired, user can try to login again.
 431             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Ban lifted.');
 432             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 433             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 434             return true; // Ban has expired, user can login.
 435         }
 436         return false; // User is banned.
 437     }
 438     return true; // User is not banned.
 439 }
 440
 441 // ------------------------------------------------------------------------------------------
 442 // Process login form: Check if login/password is correct.
 443 if (isset($_POST['login']))
 444 {
 445     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 446     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 447     {   // Login/password is OK.
 448         ban_loginOk();
 449         // If user wants to keep the session cookie even after the browser closes:
 450         if (!empty($_POST['longlastingsession']))
 451         {
 452                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 453             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 454             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 455
 456             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 457             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 458             // Note: Never forget the trailing slash on the cookie path!
 459             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 460         }
 461         else // Standard session expiration (=when browser closes)
 462         {
 463             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 464             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 465             session_regenerate_id(true);
 466         }
 467
 468         // Optional redirect after login:
 469         if (isset($_GET['post'])) {
 470             $uri = '?post='. urlencode($_GET['post']);
 471             foreach (array('description', 'source', 'title') as $param) {
 472                 if (!empty($_GET[$param])) {
 473                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 474                 }
 475             }
 476             header('Location: '. $uri);
 477             exit;
 478         }
 479
 480         if (isset($_GET['edit_link'])) {
 481             header('Location: ?edit_link='. escape($_GET['edit_link']));
 482             exit;
 483         }
 484
 485         if (isset($_POST['returnurl'])) {
 486             // Prevent loops over login screen.
 487             if (strpos($_POST['returnurl'], 'do=login') === false) {
 488                 header('Location: '. generateLocation($_POST['returnurl'], $_SERVER['HTTP_HOST']));
 489                 exit;
 490             }
 491         }
 492         header('Location: ?'); exit;
 493     }
 494     else
 495     {
 496         ban_loginFailed();
 497         $redir = '';
 498         if (isset($_GET['post'])) {
 499             $redir = '?post=' . urlencode($_GET['post']);
 500             foreach (array('description', 'source', 'title') as $param) {
 501                 if (!empty($_GET[$param])) {
 502                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 503                 }
 504             }
 505         }
 506         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 507         exit;
 508     }
 509 }
 510
 511 // ------------------------------------------------------------------------------------------
 512 // Misc utility functions:
 513
 514 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 515 function return_bytes($val)
 516 {
 517     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 518     switch($last)
 519     {
 520         case 'g': $val *= 1024;
 521         case 'm': $val *= 1024;
 522         case 'k': $val *= 1024;
 523     }
 524     return $val;
 525 }
 526
 527 // Try to determine max file size for uploads (POST).
 528 // Returns an integer (in bytes)
 529 function getMaxFileSize()
 530 {
 531     $size1 = return_bytes(ini_get('post_max_size'));
 532     $size2 = return_bytes(ini_get('upload_max_filesize'));
 533     // Return the smaller of two:
 534     $maxsize = min($size1,$size2);
 535     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 536     return $maxsize;
 537 }
 538
 539 // ------------------------------------------------------------------------------------------
 540 // Token management for XSRF protection
 541 // Token should be used in any form which acts on data (create,update,delete,import...).
 542 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 543
 544 // Returns a token.
 545 function getToken()
 546 {
 547     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 548     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 549     return $rnd;
 550 }
 551
 552 // Tells if a token is OK. Using this function will destroy the token.
 553 // true=token is OK.
 554 function tokenOk($token)
 555 {
 556     if (isset($_SESSION['tokens'][$token]))
 557     {
 558         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 559         return true; // Token is OK.
 560     }
 561     return false; // Wrong token, or already used.
 562 }
 563
 564 // ------------------------------------------------------------------------------------------
 565 /* This class is in charge of building the final page.
 566    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 567    p = new pageBuilder;
 568    p.assign('myfield','myvalue');
 569    p.renderPage('mytemplate');
 570
 571 */
 572 class pageBuilder
 573 {
 574     private $tpl; // RainTPL template
 575
 576     function __construct()
 577     {
 578         $this->tpl = false;
 579     }
 580
 581     /**
 582      * Initialize all default tpl tags.
 583      */
 584     private function initialize()
 585     {
 586         $this->tpl = new RainTPL;
 587
 588         try {
 589             $version = ApplicationUtils::checkUpdate(
 590                 shaarli_version,
 591                 $GLOBALS['config']['UPDATECHECK_FILENAME'],
 592                 $GLOBALS['config']['UPDATECHECK_INTERVAL'],
 593                 $GLOBALS['config']['ENABLE_UPDATECHECK'],
 594                 isLoggedIn(),
 595                 $GLOBALS['config']['UPDATECHECK_BRANCH']
 596             );
 597             $this->tpl->assign('newVersion', escape($version));
 598             $this->tpl->assign('versionError', '');
 599
 600         } catch (Exception $exc) {
 601             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], $exc->getMessage());
 602             $this->tpl->assign('newVersion', '');
 603             $this->tpl->assign('versionError', escape($exc->getMessage()));
 604         }
 605
 606         $this->tpl->assign('feedurl', escape(index_url($_SERVER)));
 607         $searchcrits = ''; // Search criteria
 608         if (!empty($_GET['searchtags'])) {
 609             $searchcrits .= '&searchtags=' . urlencode($_GET['searchtags']);
 610         }
 611         if (!empty($_GET['searchterm'])) {
 612             $searchcrits .= '&searchterm=' . urlencode($_GET['searchterm']);
 613         }
 614         $this->tpl->assign('searchcrits', $searchcrits);
 615         $this->tpl->assign('source', index_url($_SERVER));
 616         $this->tpl->assign('version', shaarli_version);
 617         $this->tpl->assign('scripturl', index_url($_SERVER));
 618         $this->tpl->assign('pagetitle', 'Shaarli');
 619         $this->tpl->assign('privateonly', !empty($_SESSION['privateonly'])); // Show only private links?
 620         if (!empty($GLOBALS['title'])) {
 621             $this->tpl->assign('pagetitle', $GLOBALS['title']);
 622         }
 623         if (!empty($GLOBALS['titleLink'])) {
 624             $this->tpl->assign('titleLink', $GLOBALS['titleLink']);
 625         }
 626         if (!empty($GLOBALS['pagetitle'])) {
 627             $this->tpl->assign('pagetitle', $GLOBALS['pagetitle']);
 628         }
 629         $this->tpl->assign('shaarlititle', empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title']);
 630         if (!empty($GLOBALS['plugin_errors'])) {
 631             $this->tpl->assign('plugin_errors', $GLOBALS['plugin_errors']);
 632         }
 633     }
 634
 635     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 636     public function assign($what,$where)
 637     {
 638         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 639         $this->tpl->assign($what,$where);
 640     }
 641
 642     /**
 643      * Assign an array of data to the template builder.
 644      *
 645      * @param array $data Data to assign.
 646      *
 647      * @return false if invalid data.
 648      */
 649     public function assignAll($data)
 650     {
 651         // Lazy initialization
 652         if ($this->tpl === false) {
 653             $this->initialize();
 654         }
 655
 656         if (empty($data) || !is_array($data)){
 657             return false;
 658         }
 659
 660         foreach ($data as $key => $value) {
 661             $this->assign($key, $value);
 662         }
 663     }
 664
 665     // Render a specific page (using a template).
 666     // e.g. pb.renderPage('picwall')
 667     public function renderPage($page)
 668     {
 669         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 670         $this->tpl->draw($page);
 671     }
 672
 673     /**
 674     * Render a 404 page (uses the template : tpl/404.tpl)
 675     *
 676     * usage : $PAGE->render404('The link was deleted')
 677     * @param string $message A messate to display what is not found
 678     */
 679     public function render404($message='The page you are trying to reach does not exist or has been deleted.') {
 680         header($_SERVER['SERVER_PROTOCOL'] . ' 404 Not Found');
 681         $this->tpl->assign('error_message', $message);
 682         $this->renderPage('404');
 683     }
 684 }
 685
 686 // ------------------------------------------------------------------------------------------
 687 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 688 // Gives the last 7 days (which have links).
 689 // This RSS feed cannot be filtered.
 690 function showDailyRSS() {
 691     // Cache system
 692     $query = $_SERVER["QUERY_STRING"];
 693     $cache = new CachedPage(
 694         $GLOBALS['config']['PAGECACHE'],
 695         page_url($_SERVER),
 696         startsWith($query,'do=dailyrss') && !isLoggedIn()
 697     );
 698     $cached = $cache->cachedVersion();
 699     if (!empty($cached)) {
 700         echo $cached;
 701         exit;
 702     }
 703
 704     // If cached was not found (or not usable), then read the database and build the response:
 705     // Read links from database (and filter private links if used it not logged in).
 706     $LINKSDB = new LinkDB(
 707         $GLOBALS['config']['DATASTORE'],
 708         isLoggedIn(),
 709         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 710         $GLOBALS['redirector'],
 711         $GLOBALS['config']['REDIRECTOR_URLENCODE']
 712     );
 713
 714     /* Some Shaarlies may have very few links, so we need to look
 715        back in time (rsort()) until we have enough days ($nb_of_days).
 716     */
 717     $linkdates = array();
 718     foreach ($LINKSDB as $linkdate => $value) {
 719         $linkdates[] = $linkdate;
 720     }
 721     rsort($linkdates);
 722     $nb_of_days = 7; // We take 7 days.
 723     $today = Date('Ymd');
 724     $days = array();
 725
 726     foreach ($linkdates as $linkdate) {
 727         $day = substr($linkdate, 0, 8); // Extract day (without time)
 728         if (strcmp($day,$today) < 0) {
 729             if (empty($days[$day])) {
 730                 $days[$day] = array();
 731             }
 732             $days[$day][] = $linkdate;
 733         }
 734
 735         if (count($days) > $nb_of_days) {
 736             break; // Have we collected enough days?
 737         }
 738     }
 739
 740     // Build the RSS feed.
 741     header('Content-Type: application/rss+xml; charset=utf-8');
 742     $pageaddr = escape(index_url($_SERVER));
 743     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 744     echo '<channel>';
 745     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 746     echo '<link>'. $pageaddr .'</link>';
 747     echo '<description>Daily shared links</description>';
 748     echo '<language>en-en</language>';
 749     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 750
 751     // For each day.
 752     foreach ($days as $day => $linkdates) {
 753         $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 754         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 755
 756         // Build the HTML body of this RSS entry.
 757         $html = '';
 758         $href = '';
 759         $links = array();
 760
 761         // We pre-format some fields for proper output.
 762         foreach ($linkdates as $linkdate) {
 763             $l = $LINKSDB[$linkdate];
 764             $l['formatedDescription'] = format_description($l['description'], $GLOBALS['redirector']);
 765             $l['thumbnail'] = thumbnail($l['url']);
 766             $l_date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $l['linkdate']);
 767             $l['timestamp'] = $l_date->getTimestamp();
 768             if (startsWith($l['url'], '?')) {
 769                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 770             }
 771             $links[$linkdate] = $l;
 772         }
 773
 774         // Then build the HTML for this day:
 775         $tpl = new RainTPL;
 776         $tpl->assign('title', $GLOBALS['title']);
 777         $tpl->assign('daydate', $dayDate->getTimestamp());
 778         $tpl->assign('absurl', $absurl);
 779         $tpl->assign('links', $links);
 780         $tpl->assign('rssdate', escape($dayDate->format(DateTime::RSS)));
 781         $html = $tpl->draw('dailyrss', $return_string=true);
 782
 783         echo $html . PHP_EOL;
 784     }
 785     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
 786
 787     $cache->cache(ob_get_contents());
 788     ob_end_flush();
 789     exit;
 790 }
 791
 792 /**
 793  * Show the 'Daily' page.
 794  *
 795  * @param PageBuilder $pageBuilder Template engine wrapper.
 796  * @param LinkDB $LINKSDB LinkDB instance.
 797  */
 798 function showDaily($pageBuilder, $LINKSDB)
 799 {
 800     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 801     if (isset($_GET['day'])) $day=$_GET['day'];
 802
 803     $days = $LINKSDB->days();
 804     $i = array_search($day,$days);
 805     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
 806     $previousday='';
 807     $nextday='';
 808     if ($i!==false)
 809     {
 810         if ($i>=1) $previousday=$days[$i-1];
 811         if ($i<count($days)-1) $nextday=$days[$i+1];
 812     }
 813
 814     try {
 815         $linksToDisplay = $LINKSDB->filterDay($day);
 816     } catch (Exception $exc) {
 817         error_log($exc);
 818         $linksToDisplay = array();
 819     }
 820
 821     // We pre-format some fields for proper output.
 822     foreach($linksToDisplay as $key=>$link)
 823     {
 824
 825         $taglist = explode(' ',$link['tags']);
 826         uasort($taglist, 'strcasecmp');
 827         $linksToDisplay[$key]['taglist']=$taglist;
 828         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $GLOBALS['redirector']);
 829         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
 830         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
 831         $linksToDisplay[$key]['timestamp'] = $date->getTimestamp();
 832     }
 833
 834     /* We need to spread the articles on 3 columns.
 835        I did not want to use a JavaScript lib like http://masonry.desandro.com/
 836        so I manually spread entries with a simple method: I roughly evaluate the
 837        height of a div according to title and description length.
 838     */
 839     $columns=array(array(),array(),array()); // Entries to display, for each column.
 840     $fill=array(0,0,0);  // Rough estimate of columns fill.
 841     foreach($linksToDisplay as $key=>$link)
 842     {
 843         // Roughly estimate length of entry (by counting characters)
 844         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
 845         // Description: 836 characters gives roughly 342 pixel height.
 846         // This is not perfect, but it's usually OK.
 847         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
 848         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
 849         // Then put in column which is the less filled:
 850         $smallest=min($fill); // find smallest value in array.
 851         $index=array_search($smallest,$fill); // find index of this smallest value.
 852         array_push($columns[$index],$link); // Put entry in this column.
 853         $fill[$index]+=$length;
 854     }
 855
 856     $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 857     $data = array(
 858         'linksToDisplay' => $linksToDisplay,
 859         'linkcount' => count($LINKSDB),
 860         'cols' => $columns,
 861         'day' => $dayDate->getTimestamp(),
 862         'previousday' => $previousday,
 863         'nextday' => $nextday,
 864     );
 865     $pluginManager = PluginManager::getInstance();
 866     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
 867
 868     foreach ($data as $key => $value) {
 869         $pageBuilder->assign($key, $value);
 870     }
 871
 872     $pageBuilder->renderPage('daily');
 873     exit;
 874 }
 875
 876 // Renders the linklist
 877 function showLinkList($PAGE, $LINKSDB) {
 878     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
 879     $PAGE->renderPage('linklist');
 880 }
 881
 882
 883 // ------------------------------------------------------------------------------------------
 884 // Render HTML page (according to URL parameters and user rights)
 885 function renderPage()
 886 {
 887     $LINKSDB = new LinkDB(
 888         $GLOBALS['config']['DATASTORE'],
 889         isLoggedIn(),
 890         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 891         $GLOBALS['redirector'],
 892         $GLOBALS['config']['REDIRECTOR_URLENCODE']
 893     );
 894
 895     $updater = new Updater(
 896         read_updates_file($GLOBALS['config']['UPDATES_FILE']),
 897         $GLOBALS,
 898         $LINKSDB,
 899         isLoggedIn()
 900     );
 901     try {
 902         $newUpdates = $updater->update();
 903         if (! empty($newUpdates)) {
 904             write_updates_file(
 905                 $GLOBALS['config']['UPDATES_FILE'],
 906                 $updater->getDoneUpdates()
 907             );
 908         }
 909     }
 910     catch(Exception $e) {
 911         die($e->getMessage());
 912     }
 913
 914     $PAGE = new pageBuilder;
 915
 916     // Determine which page will be rendered.
 917     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
 918     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
 919
 920     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
 921     // Then assign generated data to RainTPL.
 922     $common_hooks = array(
 923         'includes',
 924         'header',
 925         'footer',
 926     );
 927     $pluginManager = PluginManager::getInstance();
 928     foreach($common_hooks as $name) {
 929         $plugin_data = array();
 930         $pluginManager->executeHooks('render_' . $name, $plugin_data,
 931             array(
 932                 'target' => $targetPage,
 933                 'loggedin' => isLoggedIn()
 934             )
 935         );
 936         $PAGE->assign('plugins_' . $name, $plugin_data);
 937     }
 938
 939     // -------- Display login form.
 940     if ($targetPage == Router::$PAGE_LOGIN)
 941     {
 942         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
 943         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
 944         $PAGE->assign('token',$token);
 945         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
 946         $PAGE->renderPage('loginform');
 947         exit;
 948     }
 949     // -------- User wants to logout.
 950     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
 951     {
 952         invalidateCaches($GLOBALS['config']['PAGECACHE']);
 953         logout();
 954         header('Location: ?');
 955         exit;
 956     }
 957
 958     // -------- Picture wall
 959     if ($targetPage == Router::$PAGE_PICWALL)
 960     {
 961         // Optionally filter the results:
 962         $links = $LINKSDB->filterSearch($_GET);
 963         $linksToDisplay = array();
 964
 965         // Get only links which have a thumbnail.
 966         foreach($links as $link)
 967         {
 968             $permalink='?'.escape(smallhash($link['linkdate']));
 969             $thumb=lazyThumbnail($link['url'],$permalink);
 970             if ($thumb!='') // Only output links which have a thumbnail.
 971             {
 972                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
 973                 $linksToDisplay[]=$link; // Add to array.
 974             }
 975         }
 976
 977         $data = array(
 978             'linkcount' => count($LINKSDB),
 979             'linksToDisplay' => $linksToDisplay,
 980         );
 981         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
 982
 983         foreach ($data as $key => $value) {
 984             $PAGE->assign($key, $value);
 985         }
 986
 987         $PAGE->renderPage('picwall');
 988         exit;
 989     }
 990
 991     // -------- Tag cloud
 992     if ($targetPage == Router::$PAGE_TAGCLOUD)
 993     {
 994         $tags= $LINKSDB->allTags();
 995
 996         // We sort tags alphabetically, then choose a font size according to count.
 997         // First, find max value.
 998         $maxcount = 0;
 999         foreach ($tags as $value) {
1000             $maxcount = max($maxcount, $value);
1001         }
1002
1003         // Sort tags alphabetically: case insensitive, support locale if avalaible.
1004         uksort($tags, function($a, $b) {
1005             // Collator is part of PHP intl.
1006             if (class_exists('Collator')) {
1007                 $c = new Collator(setlocale(LC_COLLATE, 0));
1008                 if (!intl_is_failure(intl_get_error_code())) {
1009                     return $c->compare($a, $b);
1010                 }
1011             }
1012             return strcasecmp($a, $b);
1013         });
1014
1015         $tagList = array();
1016         foreach($tags as $key => $value) {
1017             // Tag font size scaling:
1018             //   default 15 and 30 logarithm bases affect scaling,
1019             //   22 and 6 are arbitrary font sizes for max and min sizes.
1020             $size = log($value, 15) / log($maxcount, 30) * 2.2 + 0.8;
1021             $tagList[$key] = array(
1022                 'count' => $value,
1023                 'size' => number_format($size, 2, '.', ''),
1024             );
1025         }
1026
1027         $data = array(
1028             'linkcount' => count($LINKSDB),
1029             'tags' => $tagList,
1030         );
1031         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
1032
1033         foreach ($data as $key => $value) {
1034             $PAGE->assign($key, $value);
1035         }
1036
1037         $PAGE->renderPage('tagcloud');
1038         exit;
1039     }
1040
1041     // Daily page.
1042     if ($targetPage == Router::$PAGE_DAILY) {
1043         showDaily($PAGE, $LINKSDB);
1044     }
1045
1046     // ATOM and RSS feed.
1047     if ($targetPage == Router::$PAGE_FEED_ATOM || $targetPage == Router::$PAGE_FEED_RSS) {
1048         $feedType = $targetPage == Router::$PAGE_FEED_RSS ? FeedBuilder::$FEED_RSS : FeedBuilder::$FEED_ATOM;
1049         header('Content-Type: application/'. $feedType .'+xml; charset=utf-8');
1050
1051         // Cache system
1052         $query = $_SERVER['QUERY_STRING'];
1053         $cache = new CachedPage(
1054             $GLOBALS['config']['PAGECACHE'],
1055             page_url($_SERVER),
1056             startsWith($query,'do='. $targetPage) && !isLoggedIn()
1057         );
1058         $cached = $cache->cachedVersion();
1059         if (!empty($cached)) {
1060             echo $cached;
1061             exit;
1062         }
1063
1064         // Generate data.
1065         $feedGenerator = new FeedBuilder($LINKSDB, $feedType, $_SERVER, $_GET, isLoggedIn());
1066         $feedGenerator->setLocale(strtolower(setlocale(LC_COLLATE, 0)));
1067         $feedGenerator->setHideDates($GLOBALS['config']['HIDE_TIMESTAMPS'] && !isLoggedIn());
1068         $feedGenerator->setUsePermalinks(isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS']);
1069         if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) {
1070             $feedGenerator->setPubsubhubUrl($GLOBALS['config']['PUBSUBHUB_URL']);
1071         }
1072         $data = $feedGenerator->buildData();
1073
1074         // Process plugin hook.
1075         $pluginManager = PluginManager::getInstance();
1076         $pluginManager->executeHooks('render_feed', $data, array(
1077             'loggedin' => isLoggedIn(),
1078             'target' => $targetPage,
1079         ));
1080
1081         // Render the template.
1082         $PAGE->assignAll($data);
1083         $PAGE->renderPage('feed.'. $feedType);
1084         $cache->cache(ob_get_contents());
1085         ob_end_flush();
1086         exit;
1087     }
1088
1089     // Display openseach plugin (XML)
1090     if ($targetPage == Router::$PAGE_OPENSEARCH) {
1091         header('Content-Type: application/xml; charset=utf-8');
1092         $PAGE->assign('serverurl', index_url($_SERVER));
1093         $PAGE->renderPage('opensearch');
1094         exit;
1095     }
1096
1097     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1098     if (isset($_GET['addtag']))
1099     {
1100         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1101         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1102         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1103
1104         // Prevent redirection loop
1105         if (isset($params['addtag'])) {
1106             unset($params['addtag']);
1107         }
1108
1109         // Check if this tag is already in the search query and ignore it if it is.
1110         // Each tag is always separated by a space
1111         if (isset($params['searchtags'])) {
1112             $current_tags = explode(' ', $params['searchtags']);
1113         } else {
1114             $current_tags = array();
1115         }
1116         $addtag = true;
1117         foreach ($current_tags as $value) {
1118             if ($value === $_GET['addtag']) {
1119                 $addtag = false;
1120                 break;
1121             }
1122         }
1123         // Append the tag if necessary
1124         if (empty($params['searchtags'])) {
1125             $params['searchtags'] = trim($_GET['addtag']);
1126         }
1127         else if ($addtag) {
1128             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1129         }
1130
1131         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1132         header('Location: ?'.http_build_query($params));
1133         exit;
1134     }
1135
1136     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1137     if (isset($_GET['removetag'])) {
1138         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1139         if (empty($_SERVER['HTTP_REFERER'])) {
1140             header('Location: ?');
1141             exit;
1142         }
1143
1144         // In case browser does not send HTTP_REFERER
1145         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1146
1147         // Prevent redirection loop
1148         if (isset($params['removetag'])) {
1149             unset($params['removetag']);
1150         }
1151
1152         if (isset($params['searchtags'])) {
1153             $tags = explode(' ', $params['searchtags']);
1154             // Remove value from array $tags.
1155             $tags = array_diff($tags, array($_GET['removetag']));
1156             $params['searchtags'] = implode(' ',$tags);
1157
1158             if (empty($params['searchtags'])) {
1159                 unset($params['searchtags']);
1160             }
1161
1162             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1163         }
1164         header('Location: ?'.http_build_query($params));
1165         exit;
1166     }
1167
1168     // -------- User wants to change the number of links per page (linksperpage=...)
1169     if (isset($_GET['linksperpage'])) {
1170         if (is_numeric($_GET['linksperpage'])) {
1171             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1172         }
1173
1174         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1175         exit;
1176     }
1177
1178     // -------- User wants to see only private links (toggle)
1179     if (isset($_GET['privateonly'])) {
1180         if (empty($_SESSION['privateonly'])) {
1181             $_SESSION['privateonly'] = 1; // See only private links
1182         } else {
1183             unset($_SESSION['privateonly']); // See all links
1184         }
1185
1186         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1187         exit;
1188     }
1189
1190     // -------- Handle other actions allowed for non-logged in users:
1191     if (!isLoggedIn())
1192     {
1193         // User tries to post new link but is not logged in:
1194         // Show login screen, then redirect to ?post=...
1195         if (isset($_GET['post']))
1196         {
1197             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1198             exit;
1199         }
1200
1201                 // Same case as above except that user tried to access ?do=addlink without being logged in
1202                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1203                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1204                         header('Location: ?do=login&post=');
1205                         exit;
1206                 }
1207         showLinkList($PAGE, $LINKSDB);
1208         if (isset($_GET['edit_link'])) {
1209             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1210             exit;
1211         }
1212
1213         exit; // Never remove this one! All operations below are reserved for logged in user.
1214     }
1215
1216     // -------- All other functions are reserved for the registered user:
1217
1218     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1219     if ($targetPage == Router::$PAGE_TOOLS)
1220     {
1221         $data = array(
1222             'linkcount' => count($LINKSDB),
1223             'pageabsaddr' => index_url($_SERVER),
1224         );
1225         $pluginManager->executeHooks('render_tools', $data);
1226
1227         foreach ($data as $key => $value) {
1228             $PAGE->assign($key, $value);
1229         }
1230
1231         $PAGE->renderPage('tools');
1232         exit;
1233     }
1234
1235     // -------- User wants to change his/her password.
1236     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1237     {
1238         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1239         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1240         {
1241             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1242
1243             // Make sure old password is correct.
1244             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1245             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1246             // Save new password
1247             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1248             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1249             try {
1250                 writeConfig($GLOBALS, isLoggedIn());
1251             }
1252             catch(Exception $e) {
1253                 error_log(
1254                     'ERROR while writing config file after changing password.' . PHP_EOL .
1255                     $e->getMessage()
1256                 );
1257
1258                 // TODO: do not handle exceptions/errors in JS.
1259                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1260                 exit;
1261             }
1262             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1263             exit;
1264         }
1265         else // show the change password form.
1266         {
1267             $PAGE->assign('linkcount',count($LINKSDB));
1268             $PAGE->assign('token',getToken());
1269             $PAGE->renderPage('changepassword');
1270             exit;
1271         }
1272     }
1273
1274     // -------- User wants to change configuration
1275     if ($targetPage == Router::$PAGE_CONFIGURE)
1276     {
1277         if (!empty($_POST['title']) )
1278         {
1279             if (!tokenOk($_POST['token'])) {
1280                 die('Wrong token.'); // Go away!
1281             }
1282             $tz = 'UTC';
1283             if (!empty($_POST['continent']) && !empty($_POST['city'])
1284                 && isTimeZoneValid($_POST['continent'], $_POST['city'])
1285             ) {
1286                 $tz = $_POST['continent'] . '/' . $_POST['city'];
1287             }
1288             $GLOBALS['timezone'] = $tz;
1289             $GLOBALS['title']=$_POST['title'];
1290             $GLOBALS['titleLink']=$_POST['titleLink'];
1291             $GLOBALS['redirector']=$_POST['redirector'];
1292             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1293             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1294             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1295             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1296             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1297             try {
1298                 writeConfig($GLOBALS, isLoggedIn());
1299             }
1300             catch(Exception $e) {
1301                 error_log(
1302                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1303                     $e->getMessage()
1304                 );
1305
1306                 // TODO: do not handle exceptions/errors in JS.
1307                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1308                 exit;
1309             }
1310             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1311             exit;
1312         }
1313         else // Show the configuration form.
1314         {
1315             $PAGE->assign('linkcount',count($LINKSDB));
1316             $PAGE->assign('token',getToken());
1317             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1318             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1319             list($timezone_form, $timezone_js) = generateTimeZoneForm($GLOBALS['timezone']);
1320             $PAGE->assign('timezone_form', $timezone_form);
1321             $PAGE->assign('timezone_js',$timezone_js);
1322             $PAGE->renderPage('configure');
1323             exit;
1324         }
1325     }
1326
1327     // -------- User wants to rename a tag or delete it
1328     if ($targetPage == Router::$PAGE_CHANGETAG)
1329     {
1330         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1331             $PAGE->assign('linkcount', count($LINKSDB));
1332             $PAGE->assign('token', getToken());
1333             $PAGE->assign('tags', $LINKSDB->allTags());
1334             $PAGE->renderPage('changetag');
1335             exit;
1336         }
1337
1338         if (!tokenOk($_POST['token'])) {
1339             die('Wrong token.');
1340         }
1341
1342         // Delete a tag:
1343         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1344             $needle = trim($_POST['fromtag']);
1345             // True for case-sensitive tag search.
1346             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1347             foreach($linksToAlter as $key=>$value)
1348             {
1349                 $tags = explode(' ',trim($value['tags']));
1350                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1351                 $value['tags']=trim(implode(' ',$tags));
1352                 $LINKSDB[$key]=$value;
1353             }
1354             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1355             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1356             exit;
1357         }
1358
1359         // Rename a tag:
1360         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1361             $needle = trim($_POST['fromtag']);
1362             // True for case-sensitive tag search.
1363             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1364             foreach($linksToAlter as $key=>$value)
1365             {
1366                 $tags = explode(' ',trim($value['tags']));
1367                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1368                 $value['tags']=trim(implode(' ',$tags));
1369                 $LINKSDB[$key]=$value;
1370             }
1371             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1372             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1373             exit;
1374         }
1375     }
1376
1377     // -------- User wants to add a link without using the bookmarklet: Show form.
1378     if ($targetPage == Router::$PAGE_ADDLINK)
1379     {
1380         $PAGE->assign('linkcount',count($LINKSDB));
1381         $PAGE->renderPage('addlink');
1382         exit;
1383     }
1384
1385     // -------- User clicked the "Save" button when editing a link: Save link to database.
1386     if (isset($_POST['save_edit']))
1387     {
1388         // Go away!
1389         if (! tokenOk($_POST['token'])) {
1390             die('Wrong token.');
1391         }
1392         // Remove multiple spaces.
1393         $tags = trim(preg_replace('/\s\s+/', ' ', $_POST['lf_tags']));
1394         // Remove first '-' char in tags.
1395         $tags = preg_replace('/(^| )\-/', '$1', $tags);
1396         // Remove duplicates.
1397         $tags = implode(' ', array_unique(explode(' ', $tags)));
1398         $linkdate = $_POST['lf_linkdate'];
1399         $url = trim($_POST['lf_url']);
1400         if (! startsWith($url, 'http:') && ! startsWith($url, 'https:')
1401             && ! startsWith($url, 'ftp:') && ! startsWith($url, 'magnet:')
1402             && ! startsWith($url, '?') && ! startsWith($url, 'javascript:')
1403         ) {
1404             $url = 'http://' . $url;
1405         }
1406
1407         $link = array(
1408             'title' => trim($_POST['lf_title']),
1409             'url' => $url,
1410             'description' => $_POST['lf_description'],
1411             'private' => (isset($_POST['lf_private']) ? 1 : 0),
1412             'linkdate' => $linkdate,
1413             'tags' => str_replace(',', ' ', $tags)
1414         );
1415         // If title is empty, use the URL as title.
1416         if ($link['title'] == '') {
1417             $link['title'] = $link['url'];
1418         }
1419
1420         $pluginManager->executeHooks('save_link', $link);
1421
1422         $LINKSDB[$linkdate] = $link;
1423         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1424         pubsubhub();
1425
1426         // If we are called from the bookmarklet, we must close the popup:
1427         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1428             echo '<script>self.close();</script>';
1429             exit;
1430         }
1431
1432         $returnurl = !empty($_POST['returnurl']) ? $_POST['returnurl'] : '?';
1433         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1434         // Scroll to the link which has been edited.
1435         $location .= '#' . smallHash($_POST['lf_linkdate']);
1436         // After saving the link, redirect to the page the user was on.
1437         header('Location: '. $location);
1438         exit;
1439     }
1440
1441     // -------- User clicked the "Cancel" button when editing a link.
1442     if (isset($_POST['cancel_edit']))
1443     {
1444         // If we are called from the bookmarklet, we must close the popup:
1445         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1446         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1447         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1448         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1449         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1450         exit;
1451     }
1452
1453     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1454     if (isset($_POST['delete_link']))
1455     {
1456         if (!tokenOk($_POST['token'])) die('Wrong token.');
1457         // We do not need to ask for confirmation:
1458         // - confirmation is handled by JavaScript
1459         // - we are protected from XSRF by the token.
1460         $linkdate=$_POST['lf_linkdate'];
1461
1462         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1463
1464         unset($LINKSDB[$linkdate]);
1465         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // save to disk
1466
1467         // If we are called from the bookmarklet, we must close the popup:
1468         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1469         // Pick where we're going to redirect
1470         // =============================================================
1471         // Basically, we can't redirect to where we were previously if it was a permalink
1472         // or an edit_link, because it would 404.
1473         // Cases:
1474         //    - /             : nothing in $_GET, redirect to self
1475         //    - /?page        : redirect to self
1476         //    - /?searchterm  : redirect to self (there might be other links)
1477         //    - /?searchtags  : redirect to self
1478         //    - /permalink    : redirect to / (the link does not exist anymore)
1479         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1480         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1481         // redirect is not satisfied, and only then redirect to /
1482         $location = "?";
1483         // Self redirection
1484         if (count($_GET) == 0
1485             || isset($_GET['page'])
1486             || isset($_GET['searchterm'])
1487             || isset($_GET['searchtags'])
1488         ) {
1489             if (isset($_POST['returnurl'])) {
1490                 $location = $_POST['returnurl']; // Handle redirects given by the form
1491             } else {
1492                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1493             }
1494         }
1495
1496         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1497         exit;
1498     }
1499
1500     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1501     if (isset($_GET['edit_link']))
1502     {
1503         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1504         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1505         $data = array(
1506             'linkcount' => count($LINKSDB),
1507             'link' => $link,
1508             'link_is_new' => false,
1509             'token' => getToken(),
1510             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1511             'tags' => $LINKSDB->allTags(),
1512         );
1513         $pluginManager->executeHooks('render_editlink', $data);
1514
1515         foreach ($data as $key => $value) {
1516             $PAGE->assign($key, $value);
1517         }
1518
1519         $PAGE->renderPage('editlink');
1520         exit;
1521     }
1522
1523     // -------- User want to post a new link: Display link edit form.
1524     if (isset($_GET['post'])) {
1525         $url = cleanup_url(escape($_GET['post']));
1526
1527         $link_is_new = false;
1528         // Check if URL is not already in database (in this case, we will edit the existing link)
1529         $link = $LINKSDB->getLinkFromUrl($url);
1530         if (!$link)
1531         {
1532             $link_is_new = true;
1533             $linkdate = strval(date('Ymd_His'));
1534             // Get title if it was provided in URL (by the bookmarklet).
1535             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1536             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1537             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1538             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1539             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1540             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1541             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1542                 // Short timeout to keep the application responsive
1543                 list($headers, $content) = get_http_response($url, 4);
1544                 if (strpos($headers[0], '200 OK') !== false) {
1545                     // Retrieve charset.
1546                     $charset = get_charset($headers, $content);
1547                     // Extract title.
1548                     $title = html_extract_title($content);
1549                     // Re-encode title in utf-8 if necessary.
1550                     if (! empty($title) && $charset != 'utf-8') {
1551                         $title = mb_convert_encoding($title, $charset, 'utf-8');
1552                     }
1553                 }
1554             }
1555
1556             if ($url == '') {
1557                 $url = '?' . smallHash($linkdate);
1558                 $title = 'Note: ';
1559             }
1560
1561             $link = array(
1562                 'linkdate' => $linkdate,
1563                 'title' => $title,
1564                 'url' => $url,
1565                 'description' => $description,
1566                 'tags' => $tags,
1567                 'private' => $private
1568             );
1569         }
1570
1571         $data = array(
1572             'linkcount' => count($LINKSDB),
1573             'link' => $link,
1574             'link_is_new' => $link_is_new,
1575             'token' => getToken(), // XSRF protection.
1576             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1577             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1578             'tags' => $LINKSDB->allTags(),
1579         );
1580         $pluginManager->executeHooks('render_editlink', $data);
1581
1582         foreach ($data as $key => $value) {
1583             $PAGE->assign($key, $value);
1584         }
1585
1586         $PAGE->renderPage('editlink');
1587         exit;
1588     }
1589
1590     // -------- Export as Netscape Bookmarks HTML file.
1591     if ($targetPage == Router::$PAGE_EXPORT)
1592     {
1593         if (empty($_GET['what']))
1594         {
1595             $PAGE->assign('linkcount',count($LINKSDB));
1596             $PAGE->renderPage('export');
1597             exit;
1598         }
1599         $exportWhat=$_GET['what'];
1600         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1601
1602         header('Content-Type: text/html; charset=utf-8');
1603         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1604         $currentdate=date('Y/m/d H:i:s');
1605         echo <<<HTML
1606 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1607 <!-- This is an automatically generated file.
1608      It will be read and overwritten.
1609      DO NOT EDIT! -->
1610 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1611 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1612 <TITLE>Bookmarks</TITLE>
1613 <H1>Bookmarks</H1>
1614 HTML;
1615         foreach($LINKSDB as $link)
1616         {
1617             if ($exportWhat=='all' ||
1618                ($exportWhat=='private' && $link['private']!=0) ||
1619                ($exportWhat=='public' && $link['private']==0))
1620             {
1621                 $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
1622                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.$date->getTimestamp().'" PRIVATE="'.$link['private'].'"';
1623                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1624                 echo '>'.$link['title']."</A>\n";
1625                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1626             }
1627         }
1628                 exit;
1629     }
1630
1631     // -------- User is uploading a file for import
1632     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1633     {
1634         // If file is too big, some form field may be missing.
1635         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1636         {
1637             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1638             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1639             exit;
1640         }
1641         if (!tokenOk($_POST['token'])) die('Wrong token.');
1642         importFile($LINKSDB);
1643         exit;
1644     }
1645
1646     // -------- Show upload/import dialog:
1647     if ($targetPage == Router::$PAGE_IMPORT)
1648     {
1649         $PAGE->assign('linkcount',count($LINKSDB));
1650         $PAGE->assign('token',getToken());
1651         $PAGE->assign('maxfilesize',getMaxFileSize());
1652         $PAGE->renderPage('import');
1653         exit;
1654     }
1655
1656     // Plugin administration page
1657     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1658         $pluginMeta = $pluginManager->getPluginsMeta();
1659
1660         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1661         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1662         // Load parameters.
1663         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $GLOBALS['plugins']);
1664         uasort(
1665             $enabledPlugins,
1666             function($a, $b) { return $a['order'] - $b['order']; }
1667         );
1668         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1669
1670         $PAGE->assign('enabledPlugins', $enabledPlugins);
1671         $PAGE->assign('disabledPlugins', $disabledPlugins);
1672         $PAGE->renderPage('pluginsadmin');
1673         exit;
1674     }
1675
1676     // Plugin administration form action
1677     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1678         try {
1679             if (isset($_POST['parameters_form'])) {
1680                 unset($_POST['parameters_form']);
1681                 foreach ($_POST as $param => $value) {
1682                     $GLOBALS['plugins'][$param] = escape($value);
1683                 }
1684             }
1685             else {
1686                 $GLOBALS['config']['ENABLED_PLUGINS'] = save_plugin_config($_POST);
1687             }
1688             writeConfig($GLOBALS, isLoggedIn());
1689         }
1690         catch (Exception $e) {
1691             error_log(
1692                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1693                 $e->getMessage()
1694             );
1695
1696             // TODO: do not handle exceptions/errors in JS.
1697             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do='. Router::$PAGE_PLUGINSADMIN .'\';</script>';
1698             exit;
1699         }
1700         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1701         exit;
1702     }
1703
1704     // -------- Otherwise, simply display search form and links:
1705     showLinkList($PAGE, $LINKSDB);
1706     exit;
1707 }
1708
1709 // -----------------------------------------------------------------------------------------------
1710 // Process the import file form.
1711 function importFile($LINKSDB)
1712 {
1713     if (!isLoggedIn()) { die('Not allowed.'); }
1714
1715     $filename=$_FILES['filetoupload']['name'];
1716     $filesize=$_FILES['filetoupload']['size'];
1717     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1718     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1719     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1720     $import_count=0;
1721
1722     // Sniff file type:
1723     $type='unknown';
1724     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1725
1726     // Then import the bookmarks.
1727     if ($type=='netscape')
1728     {
1729         // This is a standard Netscape-style bookmark file.
1730         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1731         foreach(explode('<DT>',$data) as $html) // explode is very fast
1732         {
1733             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1734             $d = explode('<DD>',$html);
1735             if (startswith($d[0],'<A '))
1736             {
1737                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1738                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1739                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1740                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1741                 $raw_add_date=0;
1742                 foreach($matches as $m)
1743                 {
1744                     $attr=$m[1]; $value=$m[2];
1745                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1746                     elseif ($attr=='ADD_DATE')
1747                     {
1748                         $raw_add_date=intval($value);
1749                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1750                     }
1751                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1752                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1753                 }
1754                 if ($link['url']!='')
1755                 {
1756                     if ($private==1) $link['private']=1;
1757                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1758                     if ($dblink==false)
1759                     {  // Link not in database, let's import it...
1760                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1761
1762                        // Make sure date/time is not already used by another link.
1763                        // (Some bookmark files have several different links with the same ADD_DATE)
1764                        // We increment date by 1 second until we find a date which is not used in DB.
1765                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1766                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1767                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1768                        $LINKSDB[$link['linkdate']] = $link;
1769                        $import_count++;
1770                     }
1771                     else // Link already present in database.
1772                     {
1773                         if ($overwrite)
1774                         {   // If overwrite is required, we import link data, except date/time.
1775                             $link['linkdate']=$dblink['linkdate'];
1776                             $LINKSDB[$link['linkdate']] = $link;
1777                             $import_count++;
1778                         }
1779                     }
1780
1781                 }
1782             }
1783         }
1784         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1785
1786         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1787     }
1788     else
1789     {
1790         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1791     }
1792 }
1793
1794 /**
1795  * Template for the list of links (<div id="linklist">)
1796  * This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1797  *
1798  * @param pageBuilder $PAGE    pageBuilder instance.
1799  * @param LinkDB      $LINKSDB LinkDB instance.
1800  */
1801 function buildLinkList($PAGE,$LINKSDB)
1802 {
1803     // Used in templates
1804     $searchtags = !empty($_GET['searchtags']) ? escape($_GET['searchtags']) : '';
1805     $searchterm = !empty($_GET['searchterm']) ? escape($_GET['searchterm']) : '';
1806
1807     // Smallhash filter
1808     if (! empty($_SERVER['QUERY_STRING'])
1809         && preg_match('/^[a-zA-Z0-9-_@]{6}($|&|#)/', $_SERVER['QUERY_STRING'])) {
1810         try {
1811             $linksToDisplay = $LINKSDB->filterHash($_SERVER['QUERY_STRING']);
1812         } catch (LinkNotFoundException $e) {
1813             $PAGE->render404($e->getMessage());
1814             exit;
1815         }
1816     } else {
1817         // Filter links according search parameters.
1818         $privateonly = !empty($_SESSION['privateonly']);
1819         $linksToDisplay = $LINKSDB->filterSearch($_GET, false, $privateonly);
1820     }
1821
1822     // ---- Handle paging.
1823     $keys = array();
1824     foreach ($linksToDisplay as $key => $value) {
1825         $keys[] = $key;
1826     }
1827
1828     // If there is only a single link, we change on-the-fly the title of the page.
1829     if (count($linksToDisplay) == 1) {
1830         $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1831     }
1832
1833     // Select articles according to paging.
1834     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1835     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1836     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1837     $page = $page < 1 ? 1 : $page;
1838     $page = $page > $pagecount ? $pagecount : $page;
1839     // Start index.
1840     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1841     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1842     $linkDisp = array();
1843     while ($i<$end && $i<count($keys))
1844     {
1845         $link = $linksToDisplay[$keys[$i]];
1846         $link['description'] = format_description($link['description'], $GLOBALS['redirector']);
1847         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
1848         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
1849         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
1850         $link['timestamp'] = $date->getTimestamp();
1851         $taglist = explode(' ', $link['tags']);
1852         uasort($taglist, 'strcasecmp');
1853         $link['taglist'] = $taglist;
1854         $link['shorturl'] = smallHash($link['linkdate']);
1855         // Check for both signs of a note: starting with ? and 7 chars long.
1856         if ($link['url'][0] === '?' &&
1857             strlen($link['url']) === 7) {
1858             $link['url'] = index_url($_SERVER) . $link['url'];
1859         }
1860
1861         $linkDisp[$keys[$i]] = $link;
1862         $i++;
1863     }
1864
1865     // Compute paging navigation
1866     $searchtagsUrl = empty($searchtags) ? '' : '&searchtags=' . urlencode($searchtags);
1867     $searchtermUrl = empty($searchterm) ? '' : '&searchterm=' . urlencode($searchterm);
1868     $previous_page_url = '';
1869     if ($i != count($keys)) {
1870         $previous_page_url = '?page=' . ($page+1) . $searchtermUrl . $searchtagsUrl;
1871     }
1872     $next_page_url='';
1873     if ($page>1) {
1874         $next_page_url = '?page=' . ($page-1) . $searchtermUrl . $searchtagsUrl;
1875     }
1876
1877     $token = isLoggedIn() ? getToken() : '';
1878
1879     // Fill all template fields.
1880     $data = array(
1881         'linkcount' => count($LINKSDB),
1882         'previous_page_url' => $previous_page_url,
1883         'next_page_url' => $next_page_url,
1884         'page_current' => $page,
1885         'page_max' => $pagecount,
1886         'result_count' => count($linksToDisplay),
1887         'search_term' => $searchterm,
1888         'search_tags' => $searchtags,
1889         'redirector' => empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'],  // Optional redirector URL.
1890         'token' => $token,
1891         'links' => $linkDisp,
1892         'tags' => $LINKSDB->allTags(),
1893     );
1894     // FIXME! temporary fix - see #399.
1895     if (!empty($GLOBALS['pagetitle']) && count($linkDisp) == 1) {
1896         $data['pagetitle'] = $GLOBALS['pagetitle'];
1897     }
1898
1899     $pluginManager = PluginManager::getInstance();
1900     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
1901
1902     foreach ($data as $key => $value) {
1903         $PAGE->assign($key, $value);
1904     }
1905
1906     return;
1907 }
1908
1909 // Compute the thumbnail for a link.
1910 //
1911 // With a link to the original URL.
1912 // Understands various services (youtube.com...)
1913 // Input: $url = URL for which the thumbnail must be found.
1914 //        $href = if provided, this URL will be followed instead of $url
1915 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1916 // Some of them may be missing.
1917 // Return an empty array if no thumbnail available.
1918 function computeThumbnail($url,$href=false)
1919 {
1920     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
1921     if ($href==false) $href=$url;
1922
1923     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1924     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1925     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1926     $domain = parse_url($url,PHP_URL_HOST);
1927     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1928     {
1929         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1930         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1931                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1932     }
1933     if ($domain=='youtu.be') // Youtube short links
1934     {
1935         $path = parse_url($url,PHP_URL_PATH);
1936         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1937                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1938     }
1939     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1940     {
1941         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1942         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1943                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1944     }
1945
1946     if ($domain=='imgur.com')
1947     {
1948         $path = parse_url($url,PHP_URL_PATH);
1949         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1950         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1951                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1952         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1953                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1954
1955         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1956                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1957     }
1958     if ($domain=='i.imgur.com')
1959     {
1960         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1961         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1962                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1963     }
1964     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1965     {
1966         if (strpos($url,'dailymotion.com/video/')!==false)
1967         {
1968             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1969             return array('src'=>$thumburl,
1970                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1971         }
1972     }
1973     if (endsWith($domain,'.imageshack.us'))
1974     {
1975         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1976         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1977         {
1978             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1979             return array('src'=>$thumburl,
1980                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1981         }
1982     }
1983
1984     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1985     // So we deport the thumbnail generation in order not to slow down page generation
1986     // (and we also cache the thumbnail)
1987
1988     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1989
1990     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1991         || $domain=='vimeo.com'
1992         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1993         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1994     )
1995     {
1996         if ($domain=='vimeo.com')
1997         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1998             $path = parse_url($url,PHP_URL_PATH);
1999             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
2000         }
2001         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2002         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
2003             $path = parse_url($url,PHP_URL_PATH);
2004             if (!preg_match('!/\d+.+?!',$path)) return array();
2005         }
2006         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2007         {   // Make sure this TED URL points to a video (/talks/...)
2008             $path = parse_url($url,PHP_URL_PATH);
2009             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
2010         }
2011         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2012         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2013                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2014     }
2015
2016     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
2017     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
2018     // But using the extension will do.
2019     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2020     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2021     {
2022         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2023         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2024                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2025     }
2026     return array(); // No thumbnail.
2027
2028 }
2029
2030
2031 // Returns the HTML code to display a thumbnail for a link
2032 // with a link to the original URL.
2033 // Understands various services (youtube.com...)
2034 // Input: $url = URL for which the thumbnail must be found.
2035 //        $href = if provided, this URL will be followed instead of $url
2036 // Returns '' if no thumbnail available.
2037 function thumbnail($url,$href=false)
2038 {
2039     $t = computeThumbnail($url,$href);
2040     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2041
2042     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
2043     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2044     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2045     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2046     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2047     $html.='></a>';
2048     return $html;
2049 }
2050
2051 // Returns the HTML code to display a thumbnail for a link
2052 // for the picture wall (using lazy image loading)
2053 // Understands various services (youtube.com...)
2054 // Input: $url = URL for which the thumbnail must be found.
2055 //        $href = if provided, this URL will be followed instead of $url
2056 // Returns '' if no thumbnail available.
2057 function lazyThumbnail($url,$href=false)
2058 {
2059     $t = computeThumbnail($url,$href);
2060     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2061
2062     $html='<a href="'.escape($t['href']).'">';
2063
2064     // Lazy image
2065     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
2066
2067     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2068     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2069     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2070     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2071     $html.='>';
2072
2073     // No-JavaScript fallback.
2074     $html.='<noscript><img src="'.escape($t['src']).'"';
2075     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2076     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2077     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2078     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2079     $html.='></noscript></a>';
2080
2081     return $html;
2082 }
2083
2084
2085 // -----------------------------------------------------------------------------------------------
2086 // Installation
2087 // This function should NEVER be called if the file data/config.php exists.
2088 function install()
2089 {
2090     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2091     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2092
2093
2094     // This part makes sure sessions works correctly.
2095     // (Because on some hosts, session.save_path may not be set correctly,
2096     // or we may not have write access to it.)
2097     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2098     {   // Step 2: Check if data in session is correct.
2099         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2100         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2101         echo 'It currently points to '.session_save_path().'<br>';
2102         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2103         echo '<br><a href="?">Click to try again.</a></pre>';
2104         die;
2105     }
2106     if (!isset($_SESSION['session_tested']))
2107     {   // Step 1 : Try to store data in session and reload page.
2108         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2109         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
2110     }
2111     if (isset($_GET['test_session']))
2112     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2113         header('Location: '.index_url($_SERVER));
2114     }
2115
2116
2117     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2118     {
2119         $tz = 'UTC';
2120         if (!empty($_POST['continent']) && !empty($_POST['city'])
2121             && isTimeZoneValid($_POST['continent'], $_POST['city'])
2122         ) {
2123             $tz = $_POST['continent'].'/'.$_POST['city'];
2124         }
2125         $GLOBALS['timezone'] = $tz;
2126         // Everything is ok, let's create config file.
2127         $GLOBALS['login'] = $_POST['setlogin'];
2128         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2129         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2130         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(index_url($_SERVER)) : $_POST['title'] );
2131         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2132         try {
2133             writeConfig($GLOBALS, isLoggedIn());
2134         }
2135         catch(Exception $e) {
2136             error_log(
2137                     'ERROR while writing config file after installation.' . PHP_EOL .
2138                     $e->getMessage()
2139                 );
2140
2141             // TODO: do not handle exceptions/errors in JS.
2142             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2143             exit;
2144         }
2145         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2146         exit;
2147     }
2148
2149     // Display config form:
2150     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2151     $timezone_html = '';
2152     if ($timezone_form != '') {
2153         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2154     }
2155
2156     $PAGE = new pageBuilder;
2157     $PAGE->assign('timezone_html',$timezone_html);
2158     $PAGE->assign('timezone_js',$timezone_js);
2159     $PAGE->renderPage('install');
2160     exit;
2161 }
2162
2163 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2164    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2165    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2166    This function is called by passing the URL:
2167    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2168    [URL] is the URL of the link (e.g. a flickr page)
2169    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2170    The function below will fetch the image from the webservice and store it in the cache.
2171 */
2172 function genThumbnail()
2173 {
2174     // Make sure the parameters in the URL were generated by us.
2175     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2176     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2177
2178     // Let's see if we don't already have the image for this URL in the cache.
2179     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2180     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2181     {   // We have the thumbnail, just serve it:
2182         header('Content-Type: image/jpeg');
2183         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2184         return;
2185     }
2186     // We may also serve a blank image (if service did not respond)
2187     $blankname=hash('sha1',$_GET['url']).'.gif';
2188     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2189     {
2190         header('Content-Type: image/gif');
2191         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2192         return;
2193     }
2194
2195     // Otherwise, generate the thumbnail.
2196     $url = $_GET['url'];
2197     $domain = parse_url($url,PHP_URL_HOST);
2198
2199     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2200     {
2201         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2202         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2203
2204         // Is this a link to an image, or to a flickr page ?
2205         $imageurl='';
2206         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2207         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2208             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2209             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2210         }
2211         else // This is a flickr page (html)
2212         {
2213             // Get the flickr html page.
2214             list($headers, $content) = get_http_response($url, 20);
2215             if (strpos($headers[0], '200 OK') !== false)
2216             {
2217                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2218                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2219                 if (!empty($matches[1])) $imageurl=$matches[1];
2220
2221                 // In albums (and some other pages), the link rel="image_src" is not provided,
2222                 // but flickr provides:
2223                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2224                 if ($imageurl=='')
2225                 {
2226                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2227                     if (!empty($matches[1])) $imageurl=$matches[1];
2228                 }
2229             }
2230         }
2231
2232         if ($imageurl!='')
2233         {   // Let's download the image.
2234             // Image is 240x120, so 10 seconds to download should be enough.
2235             list($headers, $content) = get_http_response($imageurl, 10);
2236             if (strpos($headers[0], '200 OK') !== false) {
2237                 // Save image to cache.
2238                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/' . $thumbname, $content);
2239                 header('Content-Type: image/jpeg');
2240                 echo $content;
2241                 return;
2242             }
2243         }
2244     }
2245
2246     elseif ($domain=='vimeo.com' )
2247     {
2248         // This is more complex: we have to perform a HTTP request, then parse the result.
2249         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2250         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2251         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2252         if (strpos($headers[0], '200 OK') !== false) {
2253             $t = unserialize($content);
2254             $imageurl = $t[0]['thumbnail_medium'];
2255             // Then we download the image and serve it to our client.
2256             list($headers, $content) = get_http_response($imageurl, 10);
2257             if (strpos($headers[0], '200 OK') !== false) {
2258                 // Save image to cache.
2259                 file_put_contents($GLOBALS['config']['CACHEDIR'] . '/' . $thumbname, $content);
2260                 header('Content-Type: image/jpeg');
2261                 echo $content;
2262                 return;
2263             }
2264         }
2265     }
2266
2267     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2268     {
2269         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2270         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2271         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2272         list($headers, $content) = get_http_response($url, 5);
2273         if (strpos($headers[0], '200 OK') !== false) {
2274             // Extract the link to the thumbnail
2275             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2276             if (!empty($matches[1]))
2277             {   // Let's download the image.
2278                 $imageurl=$matches[1];
2279                 // No control on image size, so wait long enough
2280                 list($headers, $content) = get_http_response($imageurl, 20);
2281                 if (strpos($headers[0], '200 OK') !== false) {
2282                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2283                     file_put_contents($filepath, $content); // Save image to cache.
2284                     if (resizeImage($filepath))
2285                     {
2286                         header('Content-Type: image/jpeg');
2287                         echo file_get_contents($filepath);
2288                         return;
2289                     }
2290                 }
2291             }
2292         }
2293     }
2294
2295     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2296     {
2297         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2298         // http://xkcd.com/327/
2299         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2300         list($headers, $content) = get_http_response($url, 5);
2301         if (strpos($headers[0], '200 OK') !== false) {
2302             // Extract the link to the thumbnail
2303             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2304             if (!empty($matches[1]))
2305             {   // Let's download the image.
2306                 $imageurl=$matches[1];
2307                 // No control on image size, so wait long enough
2308                 list($headers, $content) = get_http_response($imageurl, 20);
2309                 if (strpos($headers[0], '200 OK') !== false) {
2310                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2311                     // Save image to cache.
2312                     file_put_contents($filepath, $content);
2313                     if (resizeImage($filepath))
2314                     {
2315                         header('Content-Type: image/jpeg');
2316                         echo file_get_contents($filepath);
2317                         return;
2318                     }
2319                 }
2320             }
2321         }
2322     }
2323
2324     else
2325     {
2326         // For all other domains, we try to download the image and make a thumbnail.
2327         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2328         list($headers, $content) = get_http_response($url, 30);
2329         if (strpos($headers[0], '200 OK') !== false) {
2330             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2331             // Save image to cache.
2332             file_put_contents($filepath, $content);
2333             if (resizeImage($filepath))
2334             {
2335                 header('Content-Type: image/jpeg');
2336                 echo file_get_contents($filepath);
2337                 return;
2338             }
2339         }
2340     }
2341
2342
2343     // Otherwise, return an empty image (8x8 transparent gif)
2344     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2345     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2346     header('Content-Type: image/gif');
2347     echo $blankgif;
2348 }
2349
2350 // Make a thumbnail of the image (to width: 120 pixels)
2351 // Returns true if success, false otherwise.
2352 function resizeImage($filepath)
2353 {
2354     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2355
2356     // Trick: some stupid people rename GIF as JPEG... or else.
2357     // So we really try to open each image type whatever the extension is.
2358     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2359     $im=false;
2360     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2361     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2362     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2363     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2364     $w = imagesx($im);
2365     $h = imagesy($im);
2366     $ystart = 0; $yheight=$h;
2367     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2368     $nw = 120;   // Desired width
2369     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2370     // Resize image:
2371     $im2 = imagecreatetruecolor($nw,$nh);
2372     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2373     imageinterlace($im2,true); // For progressive JPEG.
2374     $tempname=$filepath.'_TEMP.jpg';
2375     imagejpeg($im2, $tempname, 90);
2376     imagedestroy($im);
2377     imagedestroy($im2);
2378     unlink($filepath);
2379     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2380     return true;
2381 }
2382
2383 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2384 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2385 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2386 renderPage();
2387 ?>