index.php

   1 <?php
   2 /**
   3  * Shaarli v0.6.2 - 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 // Access log
  48 $GLOBALS['config']['LOG_FILE'] = $GLOBALS['config']['DATADIR'].'/log.txt';
  49
  50 // For updates check of Shaarli
  51 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt';
  52
  53 // RainTPL cache directory (keep the trailing slash!)
  54 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp/';
  55 // Raintpl template directory (keep the trailing slash!)
  56 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/';
  57
  58 // Thumbnail cache directory
  59 $GLOBALS['config']['CACHEDIR'] = 'cache';
  60
  61 // Atom & RSS feed cache directory
  62 $GLOBALS['config']['PAGECACHE'] = 'pagecache';
  63
  64
  65 /*
  66  * Global configuration
  67  */
  68 // Ban IP after this many failures
  69 $GLOBALS['config']['BAN_AFTER'] = 4;
  70 // Ban duration for IP address after login failures (in seconds)
  71 $GLOBALS['config']['BAN_DURATION'] = 1800;
  72
  73 // Feed options
  74 // Enable RSS permalinks by default.
  75 // This corresponds to the default behavior of shaarli before this was added as an option.
  76 $GLOBALS['config']['ENABLE_RSS_PERMALINKS'] = true;
  77 // If true, an extra "ATOM feed" button will be displayed in the toolbar
  78 $GLOBALS['config']['SHOW_ATOM'] = false;
  79
  80 // Link display options
  81 $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = false;
  82 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false;
  83 $GLOBALS['config']['LINKS_PER_PAGE'] = 20;
  84
  85 // Open Shaarli (true): anyone can add/edit/delete links without having to login
  86 $GLOBALS['config']['OPEN_SHAARLI'] = false;
  87
  88 // Thumbnails
  89 // Display thumbnails in links
  90 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true;
  91 // Store thumbnails in a local cache
  92 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true;
  93
  94 // Update check frequency for Shaarli. 86400 seconds=24 hours
  95 $GLOBALS['config']['UPDATECHECK_BRANCH'] = 'stable';
  96 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400;
  97
  98
  99 /*
 100  * Plugin configuration
 101  *
 102  * Warning: order matters!
 103  *
 104  * These settings may be be overriden in:
 105  *  - data/config.php
 106  *  - each plugin's configuration file
 107  */
 108 //$GLOBALS['config']['ENABLED_PLUGINS'] = array(
 109 //    'qrcode', 'archiveorg', 'readityourself', 'demo_plugin', 'playvideos',
 110 //    'wallabag', 'markdown', 'addlink_toolbar',
 111 //);
 112 $GLOBALS['config']['ENABLED_PLUGINS'] = array('qrcode');
 113
 114 //$GLOBALS['plugins']['WALLABAG_URL'] = 'https://demo.wallabag.org/';
 115
 116 // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
 117 $GLOBALS['config']['PUBSUBHUB_URL'] = '';
 118
 119 /*
 120  * PHP configuration
 121  */
 122 define('shaarli_version', '0.6.2');
 123
 124 // http://server.com/x/shaarli --> /shaarli/
 125 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
 126
 127 // High execution time in case of problematic imports/exports.
 128 ini_set('max_input_time','60');
 129
 130 // Try to set max upload file size and read
 131 ini_set('memory_limit', '128M');
 132 ini_set('post_max_size', '16M');
 133 ini_set('upload_max_filesize', '16M');
 134
 135 // See all error except warnings
 136 error_reporting(E_ALL^E_WARNING);
 137 // See all errors (for debugging only)
 138 //error_reporting(-1);
 139
 140 /*
 141  * User configuration
 142  */
 143 if (is_file($GLOBALS['config']['CONFIG_FILE'])) {
 144     require_once $GLOBALS['config']['CONFIG_FILE'];
 145 }
 146
 147 // Shaarli library
 148 require_once 'application/ApplicationUtils.php';
 149 require_once 'application/Cache.php';
 150 require_once 'application/CachedPage.php';
 151 require_once 'application/FileUtils.php';
 152 require_once 'application/HttpUtils.php';
 153 require_once 'application/LinkDB.php';
 154 require_once 'application/LinkFilter.php';
 155 require_once 'application/LinkUtils.php';
 156 require_once 'application/TimeZone.php';
 157 require_once 'application/Url.php';
 158 require_once 'application/Utils.php';
 159 require_once 'application/Config.php';
 160 require_once 'application/PluginManager.php';
 161 require_once 'application/Router.php';
 162
 163 // Ensure the PHP version is supported
 164 try {
 165     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
 166 } catch(Exception $exc) {
 167     header('Content-Type: text/plain; charset=utf-8');
 168     echo $exc->getMessage();
 169     exit;
 170 }
 171
 172 // Force cookie path (but do not change lifetime)
 173 $cookie = session_get_cookie_params();
 174 $cookiedir = '';
 175 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
 176     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
 177 }
 178 // Set default cookie expiration and path.
 179 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 180 // Set session parameters on server side.
 181 // If the user does not access any page within this time, his/her session is considered expired.
 182 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 183 // Use cookies to store session.
 184 ini_set('session.use_cookies', 1);
 185 // Force cookies for session (phpsessionID forbidden in URL).
 186 ini_set('session.use_only_cookies', 1);
 187 // Prevent PHP form using sessionID in URL if cookies are disabled.
 188 ini_set('session.use_trans_sid', false);
 189
 190 session_name('shaarli');
 191 // Start session if needed (Some server auto-start sessions).
 192 if (session_id() == '') {
 193     session_start();
 194 }
 195
 196 // Regenerate session ID if invalid or not defined in cookie.
 197 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 198     session_regenerate_id(true);
 199     $_COOKIE['shaarli'] = session_id();
 200 }
 201
 202 include "inc/rain.tpl.class.php"; //include Rain TPL
 203 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
 204 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
 205
 206 $pluginManager = PluginManager::getInstance();
 207 $pluginManager->load($GLOBALS['config']['ENABLED_PLUGINS']);
 208
 209 ob_start();  // Output buffering for the page cache.
 210
 211
 212 // In case stupid admin has left magic_quotes enabled in php.ini:
 213 if (get_magic_quotes_gpc())
 214 {
 215     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 216     $_POST = array_map('stripslashes_deep', $_POST);
 217     $_GET = array_map('stripslashes_deep', $_GET);
 218     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 219 }
 220
 221 // Prevent caching on client side or proxy: (yes, it's ugly)
 222 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 223 header("Cache-Control: no-store, no-cache, must-revalidate");
 224 header("Cache-Control: post-check=0, pre-check=0", false);
 225 header("Pragma: no-cache");
 226
 227 // Handling of old config file which do not have the new parameters.
 228 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(index_url($_SERVER));
 229 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 230 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 231 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 232 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 233 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 234 // I really need to rewrite Shaarli with a proper configuation manager.
 235
 236 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 237     // Ensure Shaarli has proper access to its resources
 238     $errors = ApplicationUtils::checkResourcePermissions($GLOBALS['config']);
 239
 240     if ($errors != array()) {
 241         $message = '<p>Insufficient permissions:</p><ul>';
 242
 243         foreach ($errors as $error) {
 244             $message .= '<li>'.$error.'</li>';
 245         }
 246         $message .= '</ul>';
 247
 248         header('Content-Type: text/html; charset=utf-8');
 249         echo $message;
 250         exit;
 251     }
 252
 253     // Display the installation form if no existing config is found
 254     install();
 255 }
 256
 257 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 258 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 259 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 260
 261 // a token depending of deployment salt, user password, and the current ip
 262 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 263
 264 autoLocale(); // Sniff browser language and set date format accordingly.
 265 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 266
 267 //==================================================================================================
 268 // Checking session state (i.e. is the user still logged in)
 269 //==================================================================================================
 270
 271 function setup_login_state() {
 272         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 273             return true;
 274         }
 275         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 276         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 277         if (!isset($GLOBALS['login'])) {
 278             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 279             $loginFailure = true;
 280         }
 281         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 282             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 283             !$loginFailure)
 284         {
 285             fillSessionInfo();
 286             $userIsLoggedIn = true;
 287         }
 288         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 289         if (empty($_SESSION['uid']) ||
 290             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 291             time() >= $_SESSION['expires_on'])
 292         {
 293             logout();
 294             $userIsLoggedIn = false;
 295             $loginFailure = true;
 296         }
 297         if (!empty($_SESSION['longlastingsession'])) {
 298             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 299         }
 300         else {
 301             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 302         }
 303         if (!$loginFailure) {
 304             $userIsLoggedIn = true;
 305         }
 306
 307         return $userIsLoggedIn;
 308 }
 309 $userIsLoggedIn = setup_login_state();
 310
 311
 312 // -----------------------------------------------------------------------------------------------
 313 // Log to text file
 314 function logm($message)
 315 {
 316     $t = strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n";
 317     file_put_contents($GLOBALS['config']['LOG_FILE'], $t, FILE_APPEND);
 318 }
 319
 320 // ------------------------------------------------------------------------------------------
 321 // Sniff browser language to display dates in the right format automatically.
 322 // (Note that is may not work on your server if the corresponding local is not installed.)
 323 function autoLocale()
 324 {
 325     $attempts = array('en_US'); // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 326     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 327     {   // (It's a bit crude, but it works very well. Preferred language is always presented first.)
 328         if (preg_match('/([a-z]{2})-?([a-z]{2})?/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) {
 329             $loc = $matches[1] . (!empty($matches[2]) ? '_' . strtoupper($matches[2]) : '');
 330             $attempts = array($loc.'.UTF-8', $loc, str_replace('_', '-', $loc).'.UTF-8', str_replace('_', '-', $loc),
 331                 $loc . '_' . strtoupper($loc).'.UTF-8', $loc . '_' . strtoupper($loc),
 332                 $loc . '_' . $loc.'.UTF-8', $loc . '_' . $loc, $loc . '-' . strtoupper($loc).'.UTF-8',
 333                 $loc . '-' . strtoupper($loc), $loc . '-' . $loc.'.UTF-8', $loc . '-' . $loc);
 334         }
 335     }
 336     setlocale(LC_TIME, $attempts);  // LC_TIME = Set local for date/time format only.
 337 }
 338
 339 // ------------------------------------------------------------------------------------------
 340 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 341 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 342 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 343 function pubsubhub()
 344 {
 345     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 346     {
 347        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 348        $topic_url = array (
 349                        index_url($_SERVER).'?do=atom',
 350                        index_url($_SERVER).'?do=rss'
 351                     );
 352        $p->publish_update($topic_url);
 353     }
 354 }
 355
 356 // ------------------------------------------------------------------------------------------
 357 // Session management
 358
 359 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 360 function allIPs()
 361 {
 362     $ip = $_SERVER["REMOTE_ADDR"];
 363     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 364     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 365     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 366     return $ip;
 367 }
 368
 369 function fillSessionInfo() {
 370         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 371         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 372         $_SESSION['username']=$GLOBALS['login'];
 373         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 374 }
 375
 376 // Check that user/password is correct.
 377 function check_auth($login,$password)
 378 {
 379     $hash = sha1($password.$login.$GLOBALS['salt']);
 380     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 381     {   // Login/password is correct.
 382                 fillSessionInfo();
 383         logm('Login successful');
 384         return True;
 385     }
 386     logm('Login failed for user '.$login);
 387     return False;
 388 }
 389
 390 // Returns true if the user is logged in.
 391 function isLoggedIn()
 392 {
 393     global $userIsLoggedIn;
 394     return $userIsLoggedIn;
 395 }
 396
 397 // Force logout.
 398 function logout() {
 399     if (isset($_SESSION)) {
 400         unset($_SESSION['uid']);
 401         unset($_SESSION['ip']);
 402         unset($_SESSION['username']);
 403         unset($_SESSION['privateonly']);
 404     }
 405     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 406 }
 407
 408
 409 // ------------------------------------------------------------------------------------------
 410 // Brute force protection system
 411 // Several consecutive failed logins will ban the IP address for 30 minutes.
 412 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?>");
 413 include $GLOBALS['config']['IPBANS_FILENAME'];
 414 // Signal a failed login. Will ban the IP if too many failures:
 415 function ban_loginFailed()
 416 {
 417     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 418     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 419     $gb['FAILURES'][$ip]++;
 420     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 421     {
 422         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 423         logm('IP address banned from login');
 424     }
 425     $GLOBALS['IPBANS'] = $gb;
 426     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 427 }
 428
 429 // Signals a successful login. Resets failed login counter.
 430 function ban_loginOk()
 431 {
 432     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 433     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 434     $GLOBALS['IPBANS'] = $gb;
 435     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 436 }
 437
 438 // Checks if the user CAN login. If 'true', the user can try to login.
 439 function ban_canLogin()
 440 {
 441     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 442     if (isset($gb['BANS'][$ip]))
 443     {
 444         // User is banned. Check if the ban has expired:
 445         if ($gb['BANS'][$ip]<=time())
 446         {   // Ban expired, user can try to login again.
 447             logm('Ban lifted.');
 448             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 449             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 450             return true; // Ban has expired, user can login.
 451         }
 452         return false; // User is banned.
 453     }
 454     return true; // User is not banned.
 455 }
 456
 457 // ------------------------------------------------------------------------------------------
 458 // Process login form: Check if login/password is correct.
 459 if (isset($_POST['login']))
 460 {
 461     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 462     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 463     {   // Login/password is OK.
 464         ban_loginOk();
 465         // If user wants to keep the session cookie even after the browser closes:
 466         if (!empty($_POST['longlastingsession']))
 467         {
 468                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 469             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 470             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 471
 472             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 473             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 474             // Note: Never forget the trailing slash on the cookie path!
 475             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 476         }
 477         else // Standard session expiration (=when browser closes)
 478         {
 479             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 480             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 481             session_regenerate_id(true);
 482         }
 483
 484         // Optional redirect after login:
 485         if (isset($_GET['post'])) {
 486             $uri = '?post='. urlencode($_GET['post']);
 487             foreach (array('description', 'source', 'title') as $param) {
 488                 if (!empty($_GET[$param])) {
 489                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 490                 }
 491             }
 492             header('Location: '. $uri);
 493             exit;
 494         }
 495
 496         if (isset($_GET['edit_link'])) {
 497             header('Location: ?edit_link='. escape($_GET['edit_link']));
 498             exit;
 499         }
 500
 501         if (isset($_POST['returnurl'])) {
 502             // Prevent loops over login screen.
 503             if (strpos($_POST['returnurl'], 'do=login') === false) {
 504                 header('Location: '. escape($_POST['returnurl']));
 505                 exit;
 506             }
 507         }
 508         header('Location: ?'); exit;
 509     }
 510     else
 511     {
 512         ban_loginFailed();
 513         $redir = '';
 514         if (isset($_GET['post'])) {
 515             $redir = '?post=' . urlencode($_GET['post']);
 516             foreach (array('description', 'source', 'title') as $param) {
 517                 if (!empty($_GET[$param])) {
 518                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 519                 }
 520             }
 521         }
 522         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 523         exit;
 524     }
 525 }
 526
 527 // ------------------------------------------------------------------------------------------
 528 // Misc utility functions:
 529
 530 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 531 function return_bytes($val)
 532 {
 533     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 534     switch($last)
 535     {
 536         case 'g': $val *= 1024;
 537         case 'm': $val *= 1024;
 538         case 'k': $val *= 1024;
 539     }
 540     return $val;
 541 }
 542
 543 // Try to determine max file size for uploads (POST).
 544 // Returns an integer (in bytes)
 545 function getMaxFileSize()
 546 {
 547     $size1 = return_bytes(ini_get('post_max_size'));
 548     $size2 = return_bytes(ini_get('upload_max_filesize'));
 549     // Return the smaller of two:
 550     $maxsize = min($size1,$size2);
 551     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 552     return $maxsize;
 553 }
 554
 555 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 556     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 557     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 558 function linkdate2timestamp($linkdate)
 559 {
 560     if(strcmp($linkdate, '_000000') !== 0 || !$linkdate){
 561         $Y=$M=$D=$h=$m=$s=0;
 562         $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 563         return mktime($h,$m,$s,$M,$D,$Y);
 564     }
 565     return time();
 566 }
 567
 568 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 569     (used to build the pubDate attribute in RSS feed.)  */
 570 function linkdate2rfc822($linkdate)
 571 {
 572     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 573 }
 574
 575 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 576     (used to build the updated tags in ATOM feed.)  */
 577 function linkdate2iso8601($linkdate)
 578 {
 579     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 580 }
 581
 582 // ------------------------------------------------------------------------------------------
 583 // Token management for XSRF protection
 584 // Token should be used in any form which acts on data (create,update,delete,import...).
 585 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 586
 587 // Returns a token.
 588 function getToken()
 589 {
 590     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 591     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 592     return $rnd;
 593 }
 594
 595 // Tells if a token is OK. Using this function will destroy the token.
 596 // true=token is OK.
 597 function tokenOk($token)
 598 {
 599     if (isset($_SESSION['tokens'][$token]))
 600     {
 601         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 602         return true; // Token is OK.
 603     }
 604     return false; // Wrong token, or already used.
 605 }
 606
 607 // ------------------------------------------------------------------------------------------
 608 /* This class is in charge of building the final page.
 609    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 610    p = new pageBuilder;
 611    p.assign('myfield','myvalue');
 612    p.renderPage('mytemplate');
 613
 614 */
 615 class pageBuilder
 616 {
 617     private $tpl; // RainTPL template
 618
 619     function __construct()
 620     {
 621         $this->tpl = false;
 622     }
 623
 624     /**
 625      * Initialize all default tpl tags.
 626      */
 627     private function initialize()
 628     {
 629         $this->tpl = new RainTPL;
 630
 631         try {
 632             $version = ApplicationUtils::checkUpdate(
 633                 shaarli_version,
 634                 $GLOBALS['config']['UPDATECHECK_FILENAME'],
 635                 $GLOBALS['config']['UPDATECHECK_INTERVAL'],
 636                 $GLOBALS['config']['ENABLE_UPDATECHECK'],
 637                 isLoggedIn(),
 638                 $GLOBALS['config']['UPDATECHECK_BRANCH']
 639             );
 640             $this->tpl->assign('newVersion', escape($version));
 641             $this->tpl->assign('versionError', '');
 642
 643         } catch (Exception $exc) {
 644             logm($exc->getMessage());
 645             $this->tpl->assign('newVersion', '');
 646             $this->tpl->assign('versionError', escape($exc->getMessage()));
 647         }
 648
 649         $this->tpl->assign('feedurl', escape(index_url($_SERVER)));
 650         $searchcrits = ''; // Search criteria
 651         if (!empty($_GET['searchtags'])) {
 652             $searchcrits .= '&searchtags=' . urlencode($_GET['searchtags']);
 653         }
 654         elseif (!empty($_GET['searchterm'])) {
 655             $searchcrits .= '&searchterm=' . urlencode($_GET['searchterm']);
 656         }
 657         $this->tpl->assign('searchcrits', $searchcrits);
 658         $this->tpl->assign('source', index_url($_SERVER));
 659         $this->tpl->assign('version', shaarli_version);
 660         $this->tpl->assign('scripturl', index_url($_SERVER));
 661         $this->tpl->assign('pagetitle', 'Shaarli');
 662         $this->tpl->assign('privateonly', !empty($_SESSION['privateonly'])); // Show only private links?
 663         if (!empty($GLOBALS['title'])) {
 664             $this->tpl->assign('pagetitle', $GLOBALS['title']);
 665         }
 666         if (!empty($GLOBALS['titleLink'])) {
 667             $this->tpl->assign('titleLink', $GLOBALS['titleLink']);
 668         }
 669         if (!empty($GLOBALS['pagetitle'])) {
 670             $this->tpl->assign('pagetitle', $GLOBALS['pagetitle']);
 671         }
 672         $this->tpl->assign('shaarlititle', empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title']);
 673         if (!empty($GLOBALS['plugin_errors'])) {
 674             $this->tpl->assign('plugin_errors', $GLOBALS['plugin_errors']);
 675         }
 676     }
 677
 678     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 679     public function assign($what,$where)
 680     {
 681         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 682         $this->tpl->assign($what,$where);
 683     }
 684
 685     // Render a specific page (using a template).
 686     // e.g. pb.renderPage('picwall')
 687     public function renderPage($page)
 688     {
 689         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 690         $this->tpl->draw($page);
 691     }
 692 }
 693
 694 // ------------------------------------------------------------------------------------------
 695 // Output the last N links in RSS 2.0 format.
 696 function showRSS()
 697 {
 698     header('Content-Type: application/rss+xml; charset=utf-8');
 699
 700     // $usepermalink : If true, use permalink instead of final link.
 701     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=rss&permalinks
 702     // Also enabled through a config option
 703     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 704
 705     // Cache system
 706     $query = $_SERVER["QUERY_STRING"];
 707     $cache = new CachedPage(
 708         $GLOBALS['config']['PAGECACHE'],
 709         page_url($_SERVER),
 710         startsWith($query,'do=rss') && !isLoggedIn()
 711     );
 712     $cached = $cache->cachedVersion();
 713     if (! empty($cached)) {
 714         echo $cached;
 715         exit;
 716     }
 717
 718     // If cached was not found (or not usable), then read the database and build the response:
 719     $LINKSDB = new LinkDB(
 720         $GLOBALS['config']['DATASTORE'],
 721         isLoggedIn(),
 722         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 723         $GLOBALS['redirector']
 724     );
 725     // Read links from database (and filter private links if user it not logged in).
 726
 727     // Optionally filter the results:
 728     if (!empty($_GET['searchterm'])) {
 729         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
 730     }
 731     elseif (!empty($_GET['searchtags'])) {
 732         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
 733     }
 734     else {
 735         $linksToDisplay = $LINKSDB;
 736     }
 737
 738     $nblinksToDisplay = 50;  // Number of links to display.
 739     // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 740     if (!empty($_GET['nb'])) {
 741         $nblinksToDisplay = $_GET['nb'] == 'all' ? count($linksToDisplay) : max(intval($_GET['nb']), 1);
 742     }
 743
 744     $pageaddr = escape(index_url($_SERVER));
 745     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 746     echo '<channel><title>'.$GLOBALS['title'].'</title><link>'.$pageaddr.'</link>';
 747     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 748     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 749     {
 750         echo '<!-- PubSubHubbub Discovery -->';
 751         echo '<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 752         echo '<link rel="self" href="'.$pageaddr.'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 753         echo '<!-- End Of PubSubHubbub Discovery -->';
 754     }
 755     $i=0;
 756     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 757     while ($i<$nblinksToDisplay && $i<count($keys))
 758     {
 759         $link = $linksToDisplay[$keys[$i]];
 760         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 761         $rfc822date = linkdate2rfc822($link['linkdate']);
 762         $absurl = $link['url'];
 763         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 764         if ($usepermalinks===true)
 765             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 766         else
 767             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 768         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.escape($rfc822date)."</pubDate>\n";
 769         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 770         {
 771             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.$pageaddr.'">'.$tag.'</category>'."\n"; }
 772         }
 773
 774         // Add permalink in description
 775         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 776         // If user wants permalinks first, put the final link in description
 777         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 778         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 779         echo '<description><![CDATA['.
 780             format_description($link['description'], $GLOBALS['redirector']) .
 781             $descriptionlink . ']]></description>' . "\n</item>\n";
 782         $i++;
 783     }
 784     echo '</channel></rss><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 785
 786     $cache->cache(ob_get_contents());
 787     ob_end_flush();
 788     exit;
 789 }
 790
 791 // ------------------------------------------------------------------------------------------
 792 // Output the last N links in ATOM format.
 793 function showATOM()
 794 {
 795     header('Content-Type: application/atom+xml; charset=utf-8');
 796
 797     // $usepermalink : If true, use permalink instead of final link.
 798     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
 799     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 800
 801     // Cache system
 802     $query = $_SERVER["QUERY_STRING"];
 803     $cache = new CachedPage(
 804         $GLOBALS['config']['PAGECACHE'],
 805         page_url($_SERVER),
 806         startsWith($query,'do=atom') && !isLoggedIn()
 807     );
 808     $cached = $cache->cachedVersion();
 809     if (!empty($cached)) {
 810         echo $cached;
 811         exit;
 812     }
 813
 814     // If cached was not found (or not usable), then read the database and build the response:
 815     // Read links from database (and filter private links if used it not logged in).
 816     $LINKSDB = new LinkDB(
 817         $GLOBALS['config']['DATASTORE'],
 818         isLoggedIn(),
 819         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 820         $GLOBALS['redirector']
 821     );
 822
 823     // Optionally filter the results:
 824     if (!empty($_GET['searchterm'])) {
 825         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
 826     }
 827     else if (!empty($_GET['searchtags'])) {
 828         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
 829     }
 830     else {
 831         $linksToDisplay = $LINKSDB;
 832     }
 833
 834     $nblinksToDisplay = 50;  // Number of links to display.
 835     // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 836     if (!empty($_GET['nb'])) {
 837         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max(intval($_GET['nb']), 1);
 838     }
 839
 840     $pageaddr=escape(index_url($_SERVER));
 841     $latestDate = '';
 842     $entries='';
 843     $i=0;
 844     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 845     while ($i<$nblinksToDisplay && $i<count($keys))
 846     {
 847         $link = $linksToDisplay[$keys[$i]];
 848         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 849         $iso8601date = linkdate2iso8601($link['linkdate']);
 850         $latestDate = max($latestDate,$iso8601date);
 851         $absurl = $link['url'];
 852         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 853         $entries.='<entry><title>'.$link['title'].'</title>';
 854         if ($usepermalinks===true)
 855             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
 856         else
 857             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
 858         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.escape($iso8601date).'</updated>';
 859
 860         // Add permalink in description
 861         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 862         // If user wants permalinks first, put the final link in description
 863         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 864         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 865
 866         $entries .= '<content type="html"><![CDATA['.
 867             format_description($link['description'], $GLOBALS['redirector']) .
 868             $descriptionlink . "]]></content>\n";
 869         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
 870         {
 871             foreach(explode(' ',$link['tags']) as $tag)
 872                 { $entries.='<category scheme="'.$pageaddr.'" term="'.$tag.'" />'."\n"; }
 873         }
 874         $entries.="</entry>\n";
 875         $i++;
 876     }
 877     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
 878     $feed.='<title>'.$GLOBALS['title'].'</title>';
 879     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.escape($latestDate).'</updated>';
 880     $feed.='<link rel="self" href="'.escape(server_url($_SERVER).$_SERVER["REQUEST_URI"]).'" />';
 881     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 882     {
 883         $feed.='<!-- PubSubHubbub Discovery -->';
 884         $feed.='<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
 885         $feed.='<!-- End Of PubSubHubbub Discovery -->';
 886     }
 887     $feed.='<author><name>'.$pageaddr.'</name><uri>'.$pageaddr.'</uri></author>';
 888     $feed.='<id>'.$pageaddr.'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
 889     $feed.=$entries;
 890     $feed.='</feed><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 891     echo $feed;
 892
 893     $cache->cache(ob_get_contents());
 894     ob_end_flush();
 895     exit;
 896 }
 897
 898 // ------------------------------------------------------------------------------------------
 899 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 900 // Gives the last 7 days (which have links).
 901 // This RSS feed cannot be filtered.
 902 function showDailyRSS() {
 903     // Cache system
 904     $query = $_SERVER["QUERY_STRING"];
 905     $cache = new CachedPage(
 906         $GLOBALS['config']['PAGECACHE'],
 907         page_url($_SERVER),
 908         startsWith($query,'do=dailyrss') && !isLoggedIn()
 909     );
 910     $cached = $cache->cachedVersion();
 911     if (!empty($cached)) {
 912         echo $cached;
 913         exit;
 914     }
 915
 916     // If cached was not found (or not usable), then read the database and build the response:
 917     // Read links from database (and filter private links if used it not logged in).
 918     $LINKSDB = new LinkDB(
 919         $GLOBALS['config']['DATASTORE'],
 920         isLoggedIn(),
 921         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 922         $GLOBALS['redirector']
 923     );
 924
 925     /* Some Shaarlies may have very few links, so we need to look
 926        back in time (rsort()) until we have enough days ($nb_of_days).
 927     */
 928     $linkdates = array();
 929     foreach ($LINKSDB as $linkdate => $value) {
 930         $linkdates[] = $linkdate;
 931     }
 932     rsort($linkdates);
 933     $nb_of_days = 7; // We take 7 days.
 934     $today = Date('Ymd');
 935     $days = array();
 936
 937     foreach ($linkdates as $linkdate) {
 938         $day = substr($linkdate, 0, 8); // Extract day (without time)
 939         if (strcmp($day,$today) < 0) {
 940             if (empty($days[$day])) {
 941                 $days[$day] = array();
 942             }
 943             $days[$day][] = $linkdate;
 944         }
 945
 946         if (count($days) > $nb_of_days) {
 947             break; // Have we collected enough days?
 948         }
 949     }
 950
 951     // Build the RSS feed.
 952     header('Content-Type: application/rss+xml; charset=utf-8');
 953     $pageaddr = escape(index_url($_SERVER));
 954     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 955     echo '<channel>';
 956     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 957     echo '<link>'. $pageaddr .'</link>';
 958     echo '<description>Daily shared links</description>';
 959     echo '<language>en-en</language>';
 960     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 961
 962     // For each day.
 963     foreach ($days as $day => $linkdates) {
 964         $daydate = linkdate2timestamp($day.'_000000'); // Full text date
 965         $rfc822date = linkdate2rfc822($day.'_000000');
 966         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 967
 968         // Build the HTML body of this RSS entry.
 969         $html = '';
 970         $href = '';
 971         $links = array();
 972
 973         // We pre-format some fields for proper output.
 974         foreach ($linkdates as $linkdate) {
 975             $l = $LINKSDB[$linkdate];
 976             $l['formatedDescription'] = format_description($l['description'], $GLOBALS['redirector']);
 977             $l['thumbnail'] = thumbnail($l['url']);
 978             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
 979             if (startsWith($l['url'], '?')) {
 980                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 981             }
 982             $links[$linkdate] = $l;
 983         }
 984
 985         // Then build the HTML for this day:
 986         $tpl = new RainTPL;
 987         $tpl->assign('title', $GLOBALS['title']);
 988         $tpl->assign('daydate', $daydate);
 989         $tpl->assign('absurl', $absurl);
 990         $tpl->assign('links', $links);
 991         $tpl->assign('rfc822date', escape($rfc822date));
 992         $html = $tpl->draw('dailyrss', $return_string=true);
 993
 994         echo $html . PHP_EOL;
 995     }
 996     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
 997
 998     $cache->cache(ob_get_contents());
 999     ob_end_flush();
1000     exit;
1001 }
1002
1003 /**
1004  * Show the 'Daily' page.
1005  *
1006  * @param PageBuilder $pageBuilder Template engine wrapper.
1007  */
1008 function showDaily($pageBuilder)
1009 {
1010     $LINKSDB = new LinkDB(
1011         $GLOBALS['config']['DATASTORE'],
1012         isLoggedIn(),
1013         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1014         $GLOBALS['redirector']
1015     );
1016
1017     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
1018     if (isset($_GET['day'])) $day=$_GET['day'];
1019
1020     $days = $LINKSDB->days();
1021     $i = array_search($day,$days);
1022     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
1023     $previousday='';
1024     $nextday='';
1025     if ($i!==false)
1026     {
1027         if ($i>=1) $previousday=$days[$i-1];
1028         if ($i<count($days)-1) $nextday=$days[$i+1];
1029     }
1030
1031     try {
1032         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_DAY, $day);
1033     } catch (Exception $exc) {
1034         error_log($exc);
1035         $linksToDisplay = array();
1036     }
1037
1038     // We pre-format some fields for proper output.
1039     foreach($linksToDisplay as $key=>$link)
1040     {
1041
1042         $taglist = explode(' ',$link['tags']);
1043         uasort($taglist, 'strcasecmp');
1044         $linksToDisplay[$key]['taglist']=$taglist;
1045         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $GLOBALS['redirector']);
1046         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
1047         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
1048     }
1049
1050     /* We need to spread the articles on 3 columns.
1051        I did not want to use a JavaScript lib like http://masonry.desandro.com/
1052        so I manually spread entries with a simple method: I roughly evaluate the
1053        height of a div according to title and description length.
1054     */
1055     $columns=array(array(),array(),array()); // Entries to display, for each column.
1056     $fill=array(0,0,0);  // Rough estimate of columns fill.
1057     foreach($linksToDisplay as $key=>$link)
1058     {
1059         // Roughly estimate length of entry (by counting characters)
1060         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
1061         // Description: 836 characters gives roughly 342 pixel height.
1062         // This is not perfect, but it's usually OK.
1063         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
1064         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
1065         // Then put in column which is the less filled:
1066         $smallest=min($fill); // find smallest value in array.
1067         $index=array_search($smallest,$fill); // find index of this smallest value.
1068         array_push($columns[$index],$link); // Put entry in this column.
1069         $fill[$index]+=$length;
1070     }
1071
1072     $data = array(
1073         'linksToDisplay' => $linksToDisplay,
1074         'linkcount' => count($LINKSDB),
1075         'cols' => $columns,
1076         'day' => linkdate2timestamp($day.'_000000'),
1077         'previousday' => $previousday,
1078         'nextday' => $nextday,
1079     );
1080     $pluginManager = PluginManager::getInstance();
1081     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
1082
1083     foreach ($data as $key => $value) {
1084         $pageBuilder->assign($key, $value);
1085     }
1086
1087     $pageBuilder->renderPage('daily');
1088     exit;
1089 }
1090
1091 // Renders the linklist
1092 function showLinkList($PAGE, $LINKSDB) {
1093     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1094     $PAGE->renderPage('linklist');
1095 }
1096
1097
1098 // ------------------------------------------------------------------------------------------
1099 // Render HTML page (according to URL parameters and user rights)
1100 function renderPage()
1101 {
1102     $LINKSDB = new LinkDB(
1103         $GLOBALS['config']['DATASTORE'],
1104         isLoggedIn(),
1105         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1106         $GLOBALS['redirector']
1107     );
1108
1109     $PAGE = new pageBuilder;
1110
1111     // Determine which page will be rendered.
1112     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
1113     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
1114
1115     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
1116     // Then assign generated data to RainTPL.
1117     $common_hooks = array(
1118         'header',
1119         'footer',
1120         'includes',
1121     );
1122     $pluginManager = PluginManager::getInstance();
1123     foreach($common_hooks as $name) {
1124         $plugin_data = array();
1125         $pluginManager->executeHooks('render_' . $name, $plugin_data,
1126             array(
1127                 'target' => $targetPage,
1128                 'loggedin' => isLoggedIn()
1129             )
1130         );
1131         $PAGE->assign('plugins_' . $name, $plugin_data);
1132     }
1133
1134     // -------- Display login form.
1135     if ($targetPage == Router::$PAGE_LOGIN)
1136     {
1137         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1138         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1139         $PAGE->assign('token',$token);
1140         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
1141         $PAGE->renderPage('loginform');
1142         exit;
1143     }
1144     // -------- User wants to logout.
1145     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1146     {
1147         invalidateCaches($GLOBALS['config']['PAGECACHE']);
1148         logout();
1149         header('Location: ?');
1150         exit;
1151     }
1152
1153     // -------- Picture wall
1154     if ($targetPage == Router::$PAGE_PICWALL)
1155     {
1156         // Optionally filter the results:
1157         if (!empty($_GET['searchterm'])) {
1158             $links = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
1159         }
1160         elseif (! empty($_GET['searchtags'])) {
1161             $links = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
1162         }
1163         else {
1164             $links = $LINKSDB;
1165         }
1166
1167         $linksToDisplay = array();
1168
1169         // Get only links which have a thumbnail.
1170         foreach($links as $link)
1171         {
1172             $permalink='?'.escape(smallhash($link['linkdate']));
1173             $thumb=lazyThumbnail($link['url'],$permalink);
1174             if ($thumb!='') // Only output links which have a thumbnail.
1175             {
1176                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1177                 $linksToDisplay[]=$link; // Add to array.
1178             }
1179         }
1180
1181         $data = array(
1182             'linkcount' => count($LINKSDB),
1183             'linksToDisplay' => $linksToDisplay,
1184         );
1185         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
1186
1187         foreach ($data as $key => $value) {
1188             $PAGE->assign($key, $value);
1189         }
1190
1191         $PAGE->renderPage('picwall');
1192         exit;
1193     }
1194
1195     // -------- Tag cloud
1196     if ($targetPage == Router::$PAGE_TAGCLOUD)
1197     {
1198         $tags= $LINKSDB->allTags();
1199
1200         // We sort tags alphabetically, then choose a font size according to count.
1201         // First, find max value.
1202         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1203         ksort($tags);
1204         $tagList=array();
1205         foreach($tags as $key=>$value)
1206         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1207         {
1208             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1209         }
1210
1211         $data = array(
1212             'linkcount' => count($LINKSDB),
1213             'tags' => $tagList,
1214         );
1215         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
1216
1217         foreach ($data as $key => $value) {
1218             $PAGE->assign($key, $value);
1219         }
1220
1221         $PAGE->renderPage('tagcloud');
1222         exit;
1223     }
1224
1225     // Daily page.
1226     if ($targetPage == Router::$PAGE_DAILY) {
1227         showDaily($PAGE);
1228     }
1229
1230     // Display openseach plugin (XML)
1231     if ($targetPage == Router::$PAGE_OPENSEARCH) {
1232         header('Content-Type: application/xml; charset=utf-8');
1233         $PAGE->assign('serverurl', index_url($_SERVER));
1234         $PAGE->renderPage('opensearch');
1235         exit;
1236     }
1237
1238     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1239     if (isset($_GET['addtag']))
1240     {
1241         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1242         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1243         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1244
1245         // Prevent redirection loop
1246         if (isset($params['addtag'])) {
1247             unset($params['addtag']);
1248         }
1249
1250         // Check if this tag is already in the search query and ignore it if it is.
1251         // Each tag is always separated by a space
1252         if (isset($params['searchtags'])) {
1253             $current_tags = explode(' ', $params['searchtags']);
1254         } else {
1255             $current_tags = array();
1256         }
1257         $addtag = true;
1258         foreach ($current_tags as $value) {
1259             if ($value === $_GET['addtag']) {
1260                 $addtag = false;
1261                 break;
1262             }
1263         }
1264         // Append the tag if necessary
1265         if (empty($params['searchtags'])) {
1266             $params['searchtags'] = trim($_GET['addtag']);
1267         }
1268         else if ($addtag) {
1269             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1270         }
1271
1272         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1273         header('Location: ?'.http_build_query($params));
1274         exit;
1275     }
1276
1277     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1278     if (isset($_GET['removetag'])) {
1279         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1280         if (empty($_SERVER['HTTP_REFERER'])) {
1281             header('Location: ?');
1282             exit;
1283         }
1284
1285         // In case browser does not send HTTP_REFERER
1286         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1287
1288         // Prevent redirection loop
1289         if (isset($params['removetag'])) {
1290             unset($params['removetag']);
1291         }
1292
1293         if (isset($params['searchtags'])) {
1294             $tags = explode(' ', $params['searchtags']);
1295             // Remove value from array $tags.
1296             $tags = array_diff($tags, array($_GET['removetag']));
1297             $params['searchtags'] = implode(' ',$tags);
1298
1299             if (empty($params['searchtags'])) {
1300                 unset($params['searchtags']);
1301             }
1302
1303             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1304         }
1305         header('Location: ?'.http_build_query($params));
1306         exit;
1307     }
1308
1309     // -------- User wants to change the number of links per page (linksperpage=...)
1310     if (isset($_GET['linksperpage'])) {
1311         if (is_numeric($_GET['linksperpage'])) {
1312             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1313         }
1314
1315         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1316         exit;
1317     }
1318
1319     // -------- User wants to see only private links (toggle)
1320     if (isset($_GET['privateonly'])) {
1321         if (empty($_SESSION['privateonly'])) {
1322             $_SESSION['privateonly'] = 1; // See only private links
1323         } else {
1324             unset($_SESSION['privateonly']); // See all links
1325         }
1326
1327         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1328         exit;
1329     }
1330
1331     // -------- Handle other actions allowed for non-logged in users:
1332     if (!isLoggedIn())
1333     {
1334         // User tries to post new link but is not logged in:
1335         // Show login screen, then redirect to ?post=...
1336         if (isset($_GET['post']))
1337         {
1338             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1339             exit;
1340         }
1341
1342                 // Same case as above except that user tried to access ?do=addlink without being logged in
1343                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1344                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1345                         header('Location: ?do=login&post=');
1346                         exit;
1347                 }
1348         showLinkList($PAGE, $LINKSDB);
1349         if (isset($_GET['edit_link'])) {
1350             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1351             exit;
1352         }
1353
1354         exit; // Never remove this one! All operations below are reserved for logged in user.
1355     }
1356
1357     // -------- All other functions are reserved for the registered user:
1358
1359     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1360     if ($targetPage == Router::$PAGE_TOOLS)
1361     {
1362         $data = array(
1363             'linkcount' => count($LINKSDB),
1364             'pageabsaddr' => index_url($_SERVER),
1365         );
1366         $pluginManager->executeHooks('render_tools', $data);
1367
1368         foreach ($data as $key => $value) {
1369             $PAGE->assign($key, $value);
1370         }
1371
1372         $PAGE->renderPage('tools');
1373         exit;
1374     }
1375
1376     // -------- User wants to change his/her password.
1377     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1378     {
1379         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1380         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1381         {
1382             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1383
1384             // Make sure old password is correct.
1385             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1386             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1387             // Save new password
1388             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1389             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1390             try {
1391                 writeConfig($GLOBALS, isLoggedIn());
1392             }
1393             catch(Exception $e) {
1394                 error_log(
1395                     'ERROR while writing config file after changing password.' . PHP_EOL .
1396                     $e->getMessage()
1397                 );
1398
1399                 // TODO: do not handle exceptions/errors in JS.
1400                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1401                 exit;
1402             }
1403             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1404             exit;
1405         }
1406         else // show the change password form.
1407         {
1408             $PAGE->assign('linkcount',count($LINKSDB));
1409             $PAGE->assign('token',getToken());
1410             $PAGE->renderPage('changepassword');
1411             exit;
1412         }
1413     }
1414
1415     // -------- User wants to change configuration
1416     if ($targetPage == Router::$PAGE_CONFIGURE)
1417     {
1418         if (!empty($_POST['title']) )
1419         {
1420             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1421             $tz = 'UTC';
1422             if (!empty($_POST['continent']) && !empty($_POST['city']))
1423                 if (isTimeZoneValid($_POST['continent'],$_POST['city']))
1424                     $tz = $_POST['continent'].'/'.$_POST['city'];
1425             $GLOBALS['timezone'] = $tz;
1426             $GLOBALS['title']=$_POST['title'];
1427             $GLOBALS['titleLink']=$_POST['titleLink'];
1428             $GLOBALS['redirector']=$_POST['redirector'];
1429             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1430             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1431             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1432             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1433             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1434             try {
1435                 writeConfig($GLOBALS, isLoggedIn());
1436             }
1437             catch(Exception $e) {
1438                 error_log(
1439                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1440                     $e->getMessage()
1441                 );
1442
1443                 // TODO: do not handle exceptions/errors in JS.
1444                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1445                 exit;
1446             }
1447             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1448             exit;
1449         }
1450         else // Show the configuration form.
1451         {
1452             $PAGE->assign('linkcount',count($LINKSDB));
1453             $PAGE->assign('token',getToken());
1454             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1455             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1456             list($timezone_form, $timezone_js) = generateTimeZoneForm($GLOBALS['timezone']);
1457             $PAGE->assign('timezone_form', $timezone_form);
1458             $PAGE->assign('timezone_js',$timezone_js);
1459             $PAGE->renderPage('configure');
1460             exit;
1461         }
1462     }
1463
1464     // -------- User wants to rename a tag or delete it
1465     if ($targetPage == Router::$PAGE_CHANGETAG)
1466     {
1467         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1468             $PAGE->assign('linkcount', count($LINKSDB));
1469             $PAGE->assign('token', getToken());
1470             $PAGE->assign('tags', $LINKSDB->allTags());
1471             $PAGE->renderPage('changetag');
1472             exit;
1473         }
1474
1475         if (!tokenOk($_POST['token'])) {
1476             die('Wrong token.');
1477         }
1478
1479         // Delete a tag:
1480         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1481             $needle=trim($_POST['fromtag']);
1482             // True for case-sensitive tag search.
1483             $linksToAlter = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $needle, true);
1484             foreach($linksToAlter as $key=>$value)
1485             {
1486                 $tags = explode(' ',trim($value['tags']));
1487                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1488                 $value['tags']=trim(implode(' ',$tags));
1489                 $LINKSDB[$key]=$value;
1490             }
1491             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1492             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1493             exit;
1494         }
1495
1496         // Rename a tag:
1497         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1498             $needle=trim($_POST['fromtag']);
1499             // True for case-sensitive tag search.
1500             $linksToAlter = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $needle, true);
1501             foreach($linksToAlter as $key=>$value)
1502             {
1503                 $tags = explode(' ',trim($value['tags']));
1504                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1505                 $value['tags']=trim(implode(' ',$tags));
1506                 $LINKSDB[$key]=$value;
1507             }
1508             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1509             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1510             exit;
1511         }
1512     }
1513
1514     // -------- User wants to add a link without using the bookmarklet: Show form.
1515     if ($targetPage == Router::$PAGE_ADDLINK)
1516     {
1517         $PAGE->assign('linkcount',count($LINKSDB));
1518         $PAGE->renderPage('addlink');
1519         exit;
1520     }
1521
1522     // -------- User clicked the "Save" button when editing a link: Save link to database.
1523     if (isset($_POST['save_edit']))
1524     {
1525         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1526         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1527         $tags = implode(' ', array_unique(explode(' ', $tags))); // Remove duplicates.
1528         $linkdate=$_POST['lf_linkdate'];
1529         $url = trim($_POST['lf_url']);
1530         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?') && !startsWith($url,'javascript:'))
1531             $url = 'http://'.$url;
1532         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1533                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1534         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1535
1536         $pluginManager->executeHooks('save_link', $link);
1537
1538         $LINKSDB[$linkdate] = $link;
1539         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1540         pubsubhub();
1541
1542         // If we are called from the bookmarklet, we must close the popup:
1543         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1544             echo '<script>self.close();</script>';
1545             exit;
1546         }
1547
1548         $returnurl = !empty($_POST['returnurl']) ? escape($_POST['returnurl']): '?';
1549         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1550         $location .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1551         header('Location: '. $location); // After saving the link, redirect to the page the user was on.
1552         exit;
1553     }
1554
1555     // -------- User clicked the "Cancel" button when editing a link.
1556     if (isset($_POST['cancel_edit']))
1557     {
1558         // If we are called from the bookmarklet, we must close the popup:
1559         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1560         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1561         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1562         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1563         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1564         exit;
1565     }
1566
1567     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1568     if (isset($_POST['delete_link']))
1569     {
1570         if (!tokenOk($_POST['token'])) die('Wrong token.');
1571         // We do not need to ask for confirmation:
1572         // - confirmation is handled by JavaScript
1573         // - we are protected from XSRF by the token.
1574         $linkdate=$_POST['lf_linkdate'];
1575
1576         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1577
1578         unset($LINKSDB[$linkdate]);
1579         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // save to disk
1580
1581         // If we are called from the bookmarklet, we must close the popup:
1582         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1583         // Pick where we're going to redirect
1584         // =============================================================
1585         // Basically, we can't redirect to where we were previously if it was a permalink
1586         // or an edit_link, because it would 404.
1587         // Cases:
1588         //    - /             : nothing in $_GET, redirect to self
1589         //    - /?page        : redirect to self
1590         //    - /?searchterm  : redirect to self (there might be other links)
1591         //    - /?searchtags  : redirect to self
1592         //    - /permalink    : redirect to / (the link does not exist anymore)
1593         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1594         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1595         // redirect is not satisfied, and only then redirect to /
1596         $location = "?";
1597         // Self redirection
1598         if (count($_GET) == 0
1599             || isset($_GET['page'])
1600             || isset($_GET['searchterm'])
1601             || isset($_GET['searchtags'])
1602         ) {
1603             if (isset($_POST['returnurl'])) {
1604                 $location = $_POST['returnurl']; // Handle redirects given by the form
1605             } else {
1606                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1607             }
1608         }
1609
1610         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1611         exit;
1612     }
1613
1614     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1615     if (isset($_GET['edit_link']))
1616     {
1617         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1618         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1619         $data = array(
1620             'linkcount' => count($LINKSDB),
1621             'link' => $link,
1622             'link_is_new' => false,
1623             'token' => getToken(),
1624             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1625             'tags' => $LINKSDB->allTags(),
1626         );
1627         $pluginManager->executeHooks('render_editlink', $data);
1628
1629         foreach ($data as $key => $value) {
1630             $PAGE->assign($key, $value);
1631         }
1632
1633         $PAGE->renderPage('editlink');
1634         exit;
1635     }
1636
1637     // -------- User want to post a new link: Display link edit form.
1638     if (isset($_GET['post'])) {
1639         $url = cleanup_url(escape($_GET['post']));
1640
1641         $link_is_new = false;
1642         // Check if URL is not already in database (in this case, we will edit the existing link)
1643         $link = $LINKSDB->getLinkFromUrl($url);
1644         if (!$link)
1645         {
1646             $link_is_new = true;
1647             $linkdate = strval(date('Ymd_His'));
1648             // Get title if it was provided in URL (by the bookmarklet).
1649             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1650             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1651             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1652             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1653             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1654             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1655             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1656                 // Short timeout to keep the application responsive
1657                 list($headers, $content) = get_http_response($url, 4);
1658                 if (strpos($headers[0], '200 OK') !== false) {
1659                     // Retrieve charset.
1660                     $charset = get_charset($headers, $content);
1661                     // Extract title.
1662                     $title = html_extract_title($content);
1663                     // Re-encode title in utf-8 if necessary.
1664                     if (! empty($title) && $charset != 'utf-8') {
1665                         $title = mb_convert_encoding($title, $charset, 'utf-8');
1666                     }
1667                 }
1668             }
1669
1670             if ($url == '') {
1671                 $url = '?' . smallHash($linkdate);
1672                 $title = 'Note: ';
1673             }
1674
1675             $link = array(
1676                 'linkdate' => $linkdate,
1677                 'title' => $title,
1678                 'url' => $url,
1679                 'description' => $description,
1680                 'tags' => $tags,
1681                 'private' => $private
1682             );
1683         }
1684
1685         $data = array(
1686             'linkcount' => count($LINKSDB),
1687             'link' => $link,
1688             'link_is_new' => $link_is_new,
1689             'token' => getToken(), // XSRF protection.
1690             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1691             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1692             'tags' => $LINKSDB->allTags(),
1693         );
1694         $pluginManager->executeHooks('render_editlink', $data);
1695
1696         foreach ($data as $key => $value) {
1697             $PAGE->assign($key, $value);
1698         }
1699
1700         $PAGE->renderPage('editlink');
1701         exit;
1702     }
1703
1704     // -------- Export as Netscape Bookmarks HTML file.
1705     if ($targetPage == Router::$PAGE_EXPORT)
1706     {
1707         if (empty($_GET['what']))
1708         {
1709             $PAGE->assign('linkcount',count($LINKSDB));
1710             $PAGE->renderPage('export');
1711             exit;
1712         }
1713         $exportWhat=$_GET['what'];
1714         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1715
1716         header('Content-Type: text/html; charset=utf-8');
1717         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1718         $currentdate=date('Y/m/d H:i:s');
1719         echo <<<HTML
1720 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1721 <!-- This is an automatically generated file.
1722      It will be read and overwritten.
1723      DO NOT EDIT! -->
1724 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1725 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1726 <TITLE>Bookmarks</TITLE>
1727 <H1>Bookmarks</H1>
1728 HTML;
1729         foreach($LINKSDB as $link)
1730         {
1731             if ($exportWhat=='all' ||
1732                ($exportWhat=='private' && $link['private']!=0) ||
1733                ($exportWhat=='public' && $link['private']==0))
1734             {
1735                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1736                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1737                 echo '>'.$link['title']."</A>\n";
1738                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1739             }
1740         }
1741                 exit;
1742     }
1743
1744     // -------- User is uploading a file for import
1745     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1746     {
1747         // If file is too big, some form field may be missing.
1748         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1749         {
1750             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1751             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1752             exit;
1753         }
1754         if (!tokenOk($_POST['token'])) die('Wrong token.');
1755         importFile();
1756         exit;
1757     }
1758
1759     // -------- Show upload/import dialog:
1760     if ($targetPage == Router::$PAGE_IMPORT)
1761     {
1762         $PAGE->assign('linkcount',count($LINKSDB));
1763         $PAGE->assign('token',getToken());
1764         $PAGE->assign('maxfilesize',getMaxFileSize());
1765         $PAGE->renderPage('import');
1766         exit;
1767     }
1768
1769     // -------- Otherwise, simply display search form and links:
1770     showLinkList($PAGE, $LINKSDB);
1771     exit;
1772 }
1773
1774 // -----------------------------------------------------------------------------------------------
1775 // Process the import file form.
1776 function importFile()
1777 {
1778     if (!isLoggedIn()) { die('Not allowed.'); }
1779     $LINKSDB = new LinkDB(
1780         $GLOBALS['config']['DATASTORE'],
1781         isLoggedIn(),
1782         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1783         $GLOBALS['redirector']
1784     );
1785     $filename=$_FILES['filetoupload']['name'];
1786     $filesize=$_FILES['filetoupload']['size'];
1787     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1788     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1789     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1790     $import_count=0;
1791
1792     // Sniff file type:
1793     $type='unknown';
1794     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1795
1796     // Then import the bookmarks.
1797     if ($type=='netscape')
1798     {
1799         // This is a standard Netscape-style bookmark file.
1800         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1801         foreach(explode('<DT>',$data) as $html) // explode is very fast
1802         {
1803             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1804             $d = explode('<DD>',$html);
1805             if (startswith($d[0],'<A '))
1806             {
1807                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1808                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1809                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1810                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1811                 $raw_add_date=0;
1812                 foreach($matches as $m)
1813                 {
1814                     $attr=$m[1]; $value=$m[2];
1815                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1816                     elseif ($attr=='ADD_DATE')
1817                     {
1818                         $raw_add_date=intval($value);
1819                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1820                     }
1821                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1822                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1823                 }
1824                 if ($link['url']!='')
1825                 {
1826                     if ($private==1) $link['private']=1;
1827                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1828                     if ($dblink==false)
1829                     {  // Link not in database, let's import it...
1830                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1831
1832                        // Make sure date/time is not already used by another link.
1833                        // (Some bookmark files have several different links with the same ADD_DATE)
1834                        // We increment date by 1 second until we find a date which is not used in DB.
1835                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1836                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1837                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1838                        $LINKSDB[$link['linkdate']] = $link;
1839                        $import_count++;
1840                     }
1841                     else // Link already present in database.
1842                     {
1843                         if ($overwrite)
1844                         {   // If overwrite is required, we import link data, except date/time.
1845                             $link['linkdate']=$dblink['linkdate'];
1846                             $LINKSDB[$link['linkdate']] = $link;
1847                             $import_count++;
1848                         }
1849                     }
1850
1851                 }
1852             }
1853         }
1854         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1855
1856         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1857     }
1858     else
1859     {
1860         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1861     }
1862 }
1863
1864 // -----------------------------------------------------------------------------------------------
1865 // Template for the list of links (<div id="linklist">)
1866 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1867 function buildLinkList($PAGE,$LINKSDB)
1868 {
1869     // ---- Filter link database according to parameters
1870     $search_type = '';
1871     $search_crits = '';
1872     $privateonly = !empty($_SESSION['privateonly']) ? true : false;
1873
1874     // Fulltext search
1875     if (isset($_GET['searchterm'])) {
1876         $search_crits = escape(trim($_GET['searchterm']));
1877         $search_type = LinkFilter::$FILTER_TEXT;
1878         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits, false, $privateonly);
1879     }
1880     // Search by tag
1881     elseif (isset($_GET['searchtags'])) {
1882         $search_crits = explode(' ', escape(trim($_GET['searchtags'])));
1883         $search_type = LinkFilter::$FILTER_TAG;
1884         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits, false, $privateonly);
1885     }
1886     // Detect smallHashes in URL.
1887     elseif (isset($_SERVER['QUERY_STRING'])
1888         && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/', $_SERVER['QUERY_STRING'])) {
1889         $search_type = LinkFilter::$FILTER_HASH;
1890         $search_crits = substr(trim($_SERVER["QUERY_STRING"], '/'), 0, 6);
1891         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits);
1892
1893         if (count($linksToDisplay) == 0) {
1894             header($_SERVER['SERVER_PROTOCOL'] . ' 404 Not Found');
1895             echo '<h1>404 Not found.</h1>Oh crap.
1896                   The link you are trying to reach does not exist or has been deleted.';
1897             echo '<br>Would you mind <a href="?">clicking here</a>?';
1898             exit;
1899         }
1900     }
1901     // Otherwise, display without filtering.
1902     else {
1903         $linksToDisplay = $LINKSDB->filter('', '', false, $privateonly);
1904     }
1905
1906     // ---- Handle paging.
1907     $keys = array();
1908     foreach ($linksToDisplay as $key => $value) {
1909         $keys[] = $key;
1910     }
1911
1912     // If there is only a single link, we change on-the-fly the title of the page.
1913     if (count($linksToDisplay) == 1) {
1914         $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1915     }
1916
1917     // Select articles according to paging.
1918     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1919     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1920     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1921     $page = $page < 1 ? 1 : $page;
1922     $page = $page > $pagecount ? $pagecount : $page;
1923     // Start index.
1924     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1925     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1926     $linkDisp = array();
1927     while ($i<$end && $i<count($keys))
1928     {
1929         $link = $linksToDisplay[$keys[$i]];
1930         $link['description'] = format_description($link['description'], $GLOBALS['redirector']);
1931         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
1932         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
1933         $link['timestamp'] = linkdate2timestamp($link['linkdate']);
1934         $taglist = explode(' ', $link['tags']);
1935         uasort($taglist, 'strcasecmp');
1936         $link['taglist'] = $taglist;
1937         $link['shorturl'] = smallHash($link['linkdate']);
1938         // Check for both signs of a note: starting with ? and 7 chars long.
1939         if ($link['url'][0] === '?' &&
1940             strlen($link['url']) === 7) {
1941             $link['url'] = index_url($_SERVER) . $link['url'];
1942         }
1943
1944         $linkDisp[$keys[$i]] = $link;
1945         $i++;
1946     }
1947
1948     // Compute paging navigation
1949     $searchterm = empty($_GET['searchterm']) ? '' : '&searchterm=' . $_GET['searchterm'];
1950     $searchtags = empty($_GET['searchtags']) ? '' : '&searchtags=' . $_GET['searchtags'];
1951     $previous_page_url = '';
1952     if ($i != count($keys)) {
1953         $previous_page_url = '?page=' . ($page+1) . $searchterm . $searchtags;
1954     }
1955     $next_page_url='';
1956     if ($page>1) {
1957         $next_page_url = '?page=' . ($page-1) . $searchterm . $searchtags;
1958     }
1959
1960     $token = '';
1961     if (isLoggedIn()) {
1962         $token = getToken();
1963     }
1964
1965     // Fill all template fields.
1966     $data = array(
1967         'linkcount' => count($LINKSDB),
1968         'previous_page_url' => $previous_page_url,
1969         'next_page_url' => $next_page_url,
1970         'page_current' => $page,
1971         'page_max' => $pagecount,
1972         'result_count' => count($linksToDisplay),
1973         'search_type' => $search_type,
1974         'search_crits' => $search_crits,
1975         'redirector' => empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'],  // Optional redirector URL.
1976         'token' => $token,
1977         'links' => $linkDisp,
1978         'tags' => $LINKSDB->allTags(),
1979     );
1980     // FIXME! temporary fix - see #399.
1981     if (!empty($GLOBALS['pagetitle']) && count($linkDisp) == 1) {
1982         $data['pagetitle'] = $GLOBALS['pagetitle'];
1983     }
1984
1985     $pluginManager = PluginManager::getInstance();
1986     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
1987
1988     foreach ($data as $key => $value) {
1989         $PAGE->assign($key, $value);
1990     }
1991
1992     return;
1993 }
1994
1995 // Compute the thumbnail for a link.
1996 //
1997 // With a link to the original URL.
1998 // Understands various services (youtube.com...)
1999 // Input: $url = URL for which the thumbnail must be found.
2000 //        $href = if provided, this URL will be followed instead of $url
2001 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
2002 // Some of them may be missing.
2003 // Return an empty array if no thumbnail available.
2004 function computeThumbnail($url,$href=false)
2005 {
2006     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
2007     if ($href==false) $href=$url;
2008
2009     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
2010     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
2011     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
2012     $domain = parse_url($url,PHP_URL_HOST);
2013     if ($domain=='youtube.com' || $domain=='www.youtube.com')
2014     {
2015         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
2016         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
2017                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2018     }
2019     if ($domain=='youtu.be') // Youtube short links
2020     {
2021         $path = parse_url($url,PHP_URL_PATH);
2022         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
2023                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2024     }
2025     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
2026     {
2027         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
2028         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
2029                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
2030     }
2031
2032     if ($domain=='imgur.com')
2033     {
2034         $path = parse_url($url,PHP_URL_PATH);
2035         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
2036         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
2037                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2038         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
2039                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2040
2041         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
2042                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2043     }
2044     if ($domain=='i.imgur.com')
2045     {
2046         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
2047         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
2048                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2049     }
2050     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
2051     {
2052         if (strpos($url,'dailymotion.com/video/')!==false)
2053         {
2054             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
2055             return array('src'=>$thumburl,
2056                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
2057         }
2058     }
2059     if (endsWith($domain,'.imageshack.us'))
2060     {
2061         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2062         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2063         {
2064             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
2065             return array('src'=>$thumburl,
2066                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
2067         }
2068     }
2069
2070     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
2071     // So we deport the thumbnail generation in order not to slow down page generation
2072     // (and we also cache the thumbnail)
2073
2074     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
2075
2076     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
2077         || $domain=='vimeo.com'
2078         || $domain=='ted.com' || endsWith($domain,'.ted.com')
2079         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
2080     )
2081     {
2082         if ($domain=='vimeo.com')
2083         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
2084             $path = parse_url($url,PHP_URL_PATH);
2085             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
2086         }
2087         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2088         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
2089             $path = parse_url($url,PHP_URL_PATH);
2090             if (!preg_match('!/\d+.+?!',$path)) return array();
2091         }
2092         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2093         {   // Make sure this TED URL points to a video (/talks/...)
2094             $path = parse_url($url,PHP_URL_PATH);
2095             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
2096         }
2097         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2098         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2099                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2100     }
2101
2102     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
2103     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
2104     // But using the extension will do.
2105     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2106     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2107     {
2108         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2109         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2110                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2111     }
2112     return array(); // No thumbnail.
2113
2114 }
2115
2116
2117 // Returns the HTML code to display a thumbnail for a link
2118 // with a link to the original URL.
2119 // Understands various services (youtube.com...)
2120 // Input: $url = URL for which the thumbnail must be found.
2121 //        $href = if provided, this URL will be followed instead of $url
2122 // Returns '' if no thumbnail available.
2123 function thumbnail($url,$href=false)
2124 {
2125     $t = computeThumbnail($url,$href);
2126     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2127
2128     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
2129     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2130     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2131     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2132     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2133     $html.='></a>';
2134     return $html;
2135 }
2136
2137 // Returns the HTML code to display a thumbnail for a link
2138 // for the picture wall (using lazy image loading)
2139 // Understands various services (youtube.com...)
2140 // Input: $url = URL for which the thumbnail must be found.
2141 //        $href = if provided, this URL will be followed instead of $url
2142 // Returns '' if no thumbnail available.
2143 function lazyThumbnail($url,$href=false)
2144 {
2145     $t = computeThumbnail($url,$href);
2146     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2147
2148     $html='<a href="'.escape($t['href']).'">';
2149
2150     // Lazy image
2151     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
2152
2153     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2154     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2155     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2156     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2157     $html.='>';
2158
2159     // No-JavaScript fallback.
2160     $html.='<noscript><img src="'.escape($t['src']).'"';
2161     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2162     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2163     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2164     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2165     $html.='></noscript></a>';
2166
2167     return $html;
2168 }
2169
2170
2171 // -----------------------------------------------------------------------------------------------
2172 // Installation
2173 // This function should NEVER be called if the file data/config.php exists.
2174 function install()
2175 {
2176     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2177     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2178
2179
2180     // This part makes sure sessions works correctly.
2181     // (Because on some hosts, session.save_path may not be set correctly,
2182     // or we may not have write access to it.)
2183     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2184     {   // Step 2: Check if data in session is correct.
2185         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2186         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2187         echo 'It currently points to '.session_save_path().'<br>';
2188         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2189         echo '<br><a href="?">Click to try again.</a></pre>';
2190         die;
2191     }
2192     if (!isset($_SESSION['session_tested']))
2193     {   // Step 1 : Try to store data in session and reload page.
2194         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2195         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
2196     }
2197     if (isset($_GET['test_session']))
2198     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2199         header('Location: '.index_url($_SERVER));
2200     }
2201
2202
2203     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2204     {
2205         $tz = 'UTC';
2206         if (!empty($_POST['continent']) && !empty($_POST['city'])) {
2207             if (isTimeZoneValid($_POST['continent'], $_POST['city'])) {
2208                 $tz = $_POST['continent'].'/'.$_POST['city'];
2209             }
2210         }
2211         $GLOBALS['timezone'] = $tz;
2212         // Everything is ok, let's create config file.
2213         $GLOBALS['login'] = $_POST['setlogin'];
2214         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2215         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2216         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(index_url($_SERVER)) : $_POST['title'] );
2217         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2218         try {
2219             writeConfig($GLOBALS, isLoggedIn());
2220         }
2221         catch(Exception $e) {
2222             error_log(
2223                     'ERROR while writing config file after installation.' . PHP_EOL .
2224                     $e->getMessage()
2225                 );
2226
2227             // TODO: do not handle exceptions/errors in JS.
2228             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2229             exit;
2230         }
2231         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2232         exit;
2233     }
2234
2235     // Display config form:
2236     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2237     $timezone_html = '';
2238     if ($timezone_form != '') {
2239         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2240     }
2241
2242     $PAGE = new pageBuilder;
2243     $PAGE->assign('timezone_html',$timezone_html);
2244     $PAGE->assign('timezone_js',$timezone_js);
2245     $PAGE->renderPage('install');
2246     exit;
2247 }
2248
2249 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2250    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2251    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2252    This function is called by passing the URL:
2253    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2254    [URL] is the URL of the link (e.g. a flickr page)
2255    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2256    The function below will fetch the image from the webservice and store it in the cache.
2257 */
2258 function genThumbnail()
2259 {
2260     // Make sure the parameters in the URL were generated by us.
2261     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2262     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2263
2264     // Let's see if we don't already have the image for this URL in the cache.
2265     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2266     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2267     {   // We have the thumbnail, just serve it:
2268         header('Content-Type: image/jpeg');
2269         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2270         return;
2271     }
2272     // We may also serve a blank image (if service did not respond)
2273     $blankname=hash('sha1',$_GET['url']).'.gif';
2274     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2275     {
2276         header('Content-Type: image/gif');
2277         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2278         return;
2279     }
2280
2281     // Otherwise, generate the thumbnail.
2282     $url = $_GET['url'];
2283     $domain = parse_url($url,PHP_URL_HOST);
2284
2285     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2286     {
2287         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2288         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2289
2290         // Is this a link to an image, or to a flickr page ?
2291         $imageurl='';
2292         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2293         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2294             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2295             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2296         }
2297         else // This is a flickr page (html)
2298         {
2299             // Get the flickr html page.
2300             list($headers, $content) = get_http_response($url, 20);
2301             if (strpos($headers[0], '200 OK') !== false)
2302             {
2303                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2304                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2305                 if (!empty($matches[1])) $imageurl=$matches[1];
2306
2307                 // In albums (and some other pages), the link rel="image_src" is not provided,
2308                 // but flickr provides:
2309                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2310                 if ($imageurl=='')
2311                 {
2312                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2313                     if (!empty($matches[1])) $imageurl=$matches[1];
2314                 }
2315             }
2316         }
2317
2318         if ($imageurl!='')
2319         {   // Let's download the image.
2320             // Image is 240x120, so 10 seconds to download should be enough.
2321             list($headers, $content) = get_http_response($imageurl, 10);
2322             if (strpos($headers[0], '200 OK') !== false) {
2323                 // Save image to cache.
2324                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/' . $thumbname, $content);
2325                 header('Content-Type: image/jpeg');
2326                 echo $content;
2327                 return;
2328             }
2329         }
2330     }
2331
2332     elseif ($domain=='vimeo.com' )
2333     {
2334         // This is more complex: we have to perform a HTTP request, then parse the result.
2335         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2336         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2337         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2338         if (strpos($headers[0], '200 OK') !== false) {
2339             $t = unserialize($content);
2340             $imageurl = $t[0]['thumbnail_medium'];
2341             // Then we download the image and serve it to our client.
2342             list($headers, $content) = get_http_response($imageurl, 10);
2343             if (strpos($headers[0], '200 OK') !== false) {
2344                 // Save image to cache.
2345                 file_put_contents($GLOBALS['config']['CACHEDIR'] . '/' . $thumbname, $content);
2346                 header('Content-Type: image/jpeg');
2347                 echo $content;
2348                 return;
2349             }
2350         }
2351     }
2352
2353     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2354     {
2355         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2356         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2357         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2358         list($headers, $content) = get_http_response($url, 5);
2359         if (strpos($headers[0], '200 OK') !== false) {
2360             // Extract the link to the thumbnail
2361             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2362             if (!empty($matches[1]))
2363             {   // Let's download the image.
2364                 $imageurl=$matches[1];
2365                 // No control on image size, so wait long enough
2366                 list($headers, $content) = get_http_response($imageurl, 20);
2367                 if (strpos($headers[0], '200 OK') !== false) {
2368                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2369                     file_put_contents($filepath, $content); // Save image to cache.
2370                     if (resizeImage($filepath))
2371                     {
2372                         header('Content-Type: image/jpeg');
2373                         echo file_get_contents($filepath);
2374                         return;
2375                     }
2376                 }
2377             }
2378         }
2379     }
2380
2381     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2382     {
2383         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2384         // http://xkcd.com/327/
2385         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2386         list($headers, $content) = get_http_response($url, 5);
2387         if (strpos($headers[0], '200 OK') !== false) {
2388             // Extract the link to the thumbnail
2389             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2390             if (!empty($matches[1]))
2391             {   // Let's download the image.
2392                 $imageurl=$matches[1];
2393                 // No control on image size, so wait long enough
2394                 list($headers, $content) = get_http_response($imageurl, 20);
2395                 if (strpos($headers[0], '200 OK') !== false) {
2396                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2397                     // Save image to cache.
2398                     file_put_contents($filepath, $content);
2399                     if (resizeImage($filepath))
2400                     {
2401                         header('Content-Type: image/jpeg');
2402                         echo file_get_contents($filepath);
2403                         return;
2404                     }
2405                 }
2406             }
2407         }
2408     }
2409
2410     else
2411     {
2412         // For all other domains, we try to download the image and make a thumbnail.
2413         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2414         list($headers, $content) = get_http_response($url, 30);
2415         if (strpos($headers[0], '200 OK') !== false) {
2416             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2417             // Save image to cache.
2418             file_put_contents($filepath, $content);
2419             if (resizeImage($filepath))
2420             {
2421                 header('Content-Type: image/jpeg');
2422                 echo file_get_contents($filepath);
2423                 return;
2424             }
2425         }
2426     }
2427
2428
2429     // Otherwise, return an empty image (8x8 transparent gif)
2430     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2431     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2432     header('Content-Type: image/gif');
2433     echo $blankgif;
2434 }
2435
2436 // Make a thumbnail of the image (to width: 120 pixels)
2437 // Returns true if success, false otherwise.
2438 function resizeImage($filepath)
2439 {
2440     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2441
2442     // Trick: some stupid people rename GIF as JPEG... or else.
2443     // So we really try to open each image type whatever the extension is.
2444     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2445     $im=false;
2446     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2447     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2448     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2449     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2450     $w = imagesx($im);
2451     $h = imagesy($im);
2452     $ystart = 0; $yheight=$h;
2453     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2454     $nw = 120;   // Desired width
2455     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2456     // Resize image:
2457     $im2 = imagecreatetruecolor($nw,$nh);
2458     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2459     imageinterlace($im2,true); // For progressive JPEG.
2460     $tempname=$filepath.'_TEMP.jpg';
2461     imagejpeg($im2, $tempname, 90);
2462     imagedestroy($im);
2463     imagedestroy($im2);
2464     unlink($filepath);
2465     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2466     return true;
2467 }
2468
2469 try {
2470     mergeDeprecatedConfig($GLOBALS, isLoggedIn());
2471 } catch(Exception $e) {
2472     error_log(
2473         'ERROR while merging deprecated options.php file.' . PHP_EOL .
2474         $e->getMessage()
2475     );
2476 }
2477
2478 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2479 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2480 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2481 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2482 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2483 renderPage();
2484 ?>