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/TimeZone.php';
 156 require_once 'application/Url.php';
 157 require_once 'application/Utils.php';
 158 require_once 'application/Config.php';
 159 require_once 'application/PluginManager.php';
 160 require_once 'application/Router.php';
 161
 162 // Ensure the PHP version is supported
 163 try {
 164     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
 165 } catch(Exception $exc) {
 166     header('Content-Type: text/plain; charset=utf-8');
 167     echo $exc->getMessage();
 168     exit;
 169 }
 170
 171 // Force cookie path (but do not change lifetime)
 172 $cookie = session_get_cookie_params();
 173 $cookiedir = '';
 174 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
 175     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
 176 }
 177 // Set default cookie expiration and path.
 178 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 179 // Set session parameters on server side.
 180 // If the user does not access any page within this time, his/her session is considered expired.
 181 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 182 // Use cookies to store session.
 183 ini_set('session.use_cookies', 1);
 184 // Force cookies for session (phpsessionID forbidden in URL).
 185 ini_set('session.use_only_cookies', 1);
 186 // Prevent PHP form using sessionID in URL if cookies are disabled.
 187 ini_set('session.use_trans_sid', false);
 188
 189 session_name('shaarli');
 190 // Start session if needed (Some server auto-start sessions).
 191 if (session_id() == '') {
 192     session_start();
 193 }
 194
 195 // Regenerate session ID if invalid or not defined in cookie.
 196 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 197     session_regenerate_id(true);
 198     $_COOKIE['shaarli'] = session_id();
 199 }
 200
 201 include "inc/rain.tpl.class.php"; //include Rain TPL
 202 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
 203 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
 204
 205 $pluginManager = PluginManager::getInstance();
 206 $pluginManager->load($GLOBALS['config']['ENABLED_PLUGINS']);
 207
 208 ob_start();  // Output buffering for the page cache.
 209
 210
 211 // In case stupid admin has left magic_quotes enabled in php.ini:
 212 if (get_magic_quotes_gpc())
 213 {
 214     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 215     $_POST = array_map('stripslashes_deep', $_POST);
 216     $_GET = array_map('stripslashes_deep', $_GET);
 217     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 218 }
 219
 220 // Prevent caching on client side or proxy: (yes, it's ugly)
 221 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 222 header("Cache-Control: no-store, no-cache, must-revalidate");
 223 header("Cache-Control: post-check=0, pre-check=0", false);
 224 header("Pragma: no-cache");
 225
 226 // Handling of old config file which do not have the new parameters.
 227 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(index_url($_SERVER));
 228 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 229 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 230 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 231 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 232 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 233 // I really need to rewrite Shaarli with a proper configuation manager.
 234
 235 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 236     // Ensure Shaarli has proper access to its resources
 237     $errors = ApplicationUtils::checkResourcePermissions($GLOBALS['config']);
 238
 239     if ($errors != array()) {
 240         $message = '<p>Insufficient permissions:</p><ul>';
 241
 242         foreach ($errors as $error) {
 243             $message .= '<li>'.$error.'</li>';
 244         }
 245         $message .= '</ul>';
 246
 247         header('Content-Type: text/html; charset=utf-8');
 248         echo $message;
 249         exit;
 250     }
 251
 252     // Display the installation form if no existing config is found
 253     install();
 254 }
 255
 256 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 257 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 258 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 259
 260 // a token depending of deployment salt, user password, and the current ip
 261 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 262
 263 autoLocale(); // Sniff browser language and set date format accordingly.
 264 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 265
 266 //==================================================================================================
 267 // Checking session state (i.e. is the user still logged in)
 268 //==================================================================================================
 269
 270 function setup_login_state() {
 271         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 272             return true;
 273         }
 274         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 275         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 276         if (!isset($GLOBALS['login'])) {
 277             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 278             $loginFailure = true;
 279         }
 280         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 281             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 282             !$loginFailure)
 283         {
 284             fillSessionInfo();
 285             $userIsLoggedIn = true;
 286         }
 287         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 288         if (empty($_SESSION['uid']) ||
 289             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 290             time() >= $_SESSION['expires_on'])
 291         {
 292             logout();
 293             $userIsLoggedIn = false;
 294             $loginFailure = true;
 295         }
 296         if (!empty($_SESSION['longlastingsession'])) {
 297             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 298         }
 299         else {
 300             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 301         }
 302         if (!$loginFailure) {
 303             $userIsLoggedIn = true;
 304         }
 305
 306         return $userIsLoggedIn;
 307 }
 308 $userIsLoggedIn = setup_login_state();
 309
 310
 311 // -----------------------------------------------------------------------------------------------
 312 // Log to text file
 313 function logm($message)
 314 {
 315     $t = strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n";
 316     file_put_contents($GLOBALS['config']['LOG_FILE'], $t, FILE_APPEND);
 317 }
 318
 319 // ------------------------------------------------------------------------------------------
 320 // Sniff browser language to display dates in the right format automatically.
 321 // (Note that is may not work on your server if the corresponding local is not installed.)
 322 function autoLocale()
 323 {
 324     $attempts = array('en_US'); // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 325     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 326     {   // (It's a bit crude, but it works very well. Preferred language is always presented first.)
 327         if (preg_match('/([a-z]{2})-?([a-z]{2})?/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) {
 328             $loc = $matches[1] . (!empty($matches[2]) ? '_' . strtoupper($matches[2]) : '');
 329             $attempts = array($loc.'.UTF-8', $loc, str_replace('_', '-', $loc).'.UTF-8', str_replace('_', '-', $loc),
 330                 $loc . '_' . strtoupper($loc).'.UTF-8', $loc . '_' . strtoupper($loc),
 331                 $loc . '_' . $loc.'.UTF-8', $loc . '_' . $loc, $loc . '-' . strtoupper($loc).'.UTF-8',
 332                 $loc . '-' . strtoupper($loc), $loc . '-' . $loc.'.UTF-8', $loc . '-' . $loc);
 333         }
 334     }
 335     setlocale(LC_TIME, $attempts);  // LC_TIME = Set local for date/time format only.
 336 }
 337
 338 // ------------------------------------------------------------------------------------------
 339 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 340 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 341 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 342 function pubsubhub()
 343 {
 344     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 345     {
 346        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 347        $topic_url = array (
 348                        index_url($_SERVER).'?do=atom',
 349                        index_url($_SERVER).'?do=rss'
 350                     );
 351        $p->publish_update($topic_url);
 352     }
 353 }
 354
 355 // ------------------------------------------------------------------------------------------
 356 // Session management
 357
 358 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 359 function allIPs()
 360 {
 361     $ip = $_SERVER["REMOTE_ADDR"];
 362     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 363     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 364     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 365     return $ip;
 366 }
 367
 368 function fillSessionInfo() {
 369         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 370         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 371         $_SESSION['username']=$GLOBALS['login'];
 372         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 373 }
 374
 375 // Check that user/password is correct.
 376 function check_auth($login,$password)
 377 {
 378     $hash = sha1($password.$login.$GLOBALS['salt']);
 379     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 380     {   // Login/password is correct.
 381                 fillSessionInfo();
 382         logm('Login successful');
 383         return True;
 384     }
 385     logm('Login failed for user '.$login);
 386     return False;
 387 }
 388
 389 // Returns true if the user is logged in.
 390 function isLoggedIn()
 391 {
 392     global $userIsLoggedIn;
 393     return $userIsLoggedIn;
 394 }
 395
 396 // Force logout.
 397 function logout() {
 398     if (isset($_SESSION)) {
 399         unset($_SESSION['uid']);
 400         unset($_SESSION['ip']);
 401         unset($_SESSION['username']);
 402         unset($_SESSION['privateonly']);
 403     }
 404     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 405 }
 406
 407
 408 // ------------------------------------------------------------------------------------------
 409 // Brute force protection system
 410 // Several consecutive failed logins will ban the IP address for 30 minutes.
 411 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?>");
 412 include $GLOBALS['config']['IPBANS_FILENAME'];
 413 // Signal a failed login. Will ban the IP if too many failures:
 414 function ban_loginFailed()
 415 {
 416     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 417     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 418     $gb['FAILURES'][$ip]++;
 419     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 420     {
 421         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 422         logm('IP address banned from login');
 423     }
 424     $GLOBALS['IPBANS'] = $gb;
 425     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 426 }
 427
 428 // Signals a successful login. Resets failed login counter.
 429 function ban_loginOk()
 430 {
 431     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 432     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 433     $GLOBALS['IPBANS'] = $gb;
 434     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 435 }
 436
 437 // Checks if the user CAN login. If 'true', the user can try to login.
 438 function ban_canLogin()
 439 {
 440     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 441     if (isset($gb['BANS'][$ip]))
 442     {
 443         // User is banned. Check if the ban has expired:
 444         if ($gb['BANS'][$ip]<=time())
 445         {   // Ban expired, user can try to login again.
 446             logm('Ban lifted.');
 447             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 448             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 449             return true; // Ban has expired, user can login.
 450         }
 451         return false; // User is banned.
 452     }
 453     return true; // User is not banned.
 454 }
 455
 456 // ------------------------------------------------------------------------------------------
 457 // Process login form: Check if login/password is correct.
 458 if (isset($_POST['login']))
 459 {
 460     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 461     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 462     {   // Login/password is OK.
 463         ban_loginOk();
 464         // If user wants to keep the session cookie even after the browser closes:
 465         if (!empty($_POST['longlastingsession']))
 466         {
 467                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 468             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 469             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 470
 471             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 472             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 473             // Note: Never forget the trailing slash on the cookie path!
 474             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 475         }
 476         else // Standard session expiration (=when browser closes)
 477         {
 478             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 479             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 480             session_regenerate_id(true);
 481         }
 482
 483         // Optional redirect after login:
 484         if (isset($_GET['post'])) {
 485             $uri = '?post='. urlencode($_GET['post']);
 486             foreach (array('description', 'source', 'title') as $param) {
 487                 if (!empty($_GET[$param])) {
 488                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 489                 }
 490             }
 491             header('Location: '. $uri);
 492             exit;
 493         }
 494
 495         if (isset($_GET['edit_link'])) {
 496             header('Location: ?edit_link='. escape($_GET['edit_link']));
 497             exit;
 498         }
 499
 500         if (isset($_POST['returnurl'])) {
 501             // Prevent loops over login screen.
 502             if (strpos($_POST['returnurl'], 'do=login') === false) {
 503                 header('Location: '. escape($_POST['returnurl']));
 504                 exit;
 505             }
 506         }
 507         header('Location: ?'); exit;
 508     }
 509     else
 510     {
 511         ban_loginFailed();
 512         $redir = '';
 513         if (isset($_GET['post'])) {
 514             $redir = '?post=' . urlencode($_GET['post']);
 515             foreach (array('description', 'source', 'title') as $param) {
 516                 if (!empty($_GET[$param])) {
 517                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 518                 }
 519             }
 520         }
 521         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 522         exit;
 523     }
 524 }
 525
 526 // ------------------------------------------------------------------------------------------
 527 // Misc utility functions:
 528
 529 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 530 function return_bytes($val)
 531 {
 532     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 533     switch($last)
 534     {
 535         case 'g': $val *= 1024;
 536         case 'm': $val *= 1024;
 537         case 'k': $val *= 1024;
 538     }
 539     return $val;
 540 }
 541
 542 // Try to determine max file size for uploads (POST).
 543 // Returns an integer (in bytes)
 544 function getMaxFileSize()
 545 {
 546     $size1 = return_bytes(ini_get('post_max_size'));
 547     $size2 = return_bytes(ini_get('upload_max_filesize'));
 548     // Return the smaller of two:
 549     $maxsize = min($size1,$size2);
 550     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 551     return $maxsize;
 552 }
 553
 554 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 555     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 556     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 557 function linkdate2timestamp($linkdate)
 558 {
 559     if(strcmp($linkdate, '_000000') !== 0 || !$linkdate){
 560         $Y=$M=$D=$h=$m=$s=0;
 561         $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 562         return mktime($h,$m,$s,$M,$D,$Y);
 563     }
 564     return time();
 565 }
 566
 567 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 568     (used to build the pubDate attribute in RSS feed.)  */
 569 function linkdate2rfc822($linkdate)
 570 {
 571     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 572 }
 573
 574 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 575     (used to build the updated tags in ATOM feed.)  */
 576 function linkdate2iso8601($linkdate)
 577 {
 578     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 579 }
 580
 581 // Extract title from an HTML document.
 582 // (Returns an empty string if not found.)
 583 function html_extract_title($html)
 584 {
 585   return preg_match('!<title>(.*?)</title>!is', $html, $matches) ? trim(str_replace("\n",' ', $matches[1])) : '' ;
 586 }
 587
 588 // ------------------------------------------------------------------------------------------
 589 // Token management for XSRF protection
 590 // Token should be used in any form which acts on data (create,update,delete,import...).
 591 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 592
 593 // Returns a token.
 594 function getToken()
 595 {
 596     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 597     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 598     return $rnd;
 599 }
 600
 601 // Tells if a token is OK. Using this function will destroy the token.
 602 // true=token is OK.
 603 function tokenOk($token)
 604 {
 605     if (isset($_SESSION['tokens'][$token]))
 606     {
 607         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 608         return true; // Token is OK.
 609     }
 610     return false; // Wrong token, or already used.
 611 }
 612
 613 // ------------------------------------------------------------------------------------------
 614 /* This class is in charge of building the final page.
 615    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 616    p = new pageBuilder;
 617    p.assign('myfield','myvalue');
 618    p.renderPage('mytemplate');
 619
 620 */
 621 class pageBuilder
 622 {
 623     private $tpl; // RainTPL template
 624
 625     function __construct()
 626     {
 627         $this->tpl = false;
 628     }
 629
 630     /**
 631      * Initialize all default tpl tags.
 632      */
 633     private function initialize()
 634     {
 635         $this->tpl = new RainTPL;
 636
 637         try {
 638             $version = ApplicationUtils::checkUpdate(
 639                 shaarli_version,
 640                 $GLOBALS['config']['UPDATECHECK_FILENAME'],
 641                 $GLOBALS['config']['UPDATECHECK_INTERVAL'],
 642                 $GLOBALS['config']['ENABLE_UPDATECHECK'],
 643                 isLoggedIn(),
 644                 $GLOBALS['config']['UPDATECHECK_BRANCH']
 645             );
 646             $this->tpl->assign('newVersion', escape($version));
 647             $this->tpl->assign('versionError', '');
 648
 649         } catch (Exception $exc) {
 650             logm($exc->getMessage());
 651             $this->tpl->assign('newVersion', '');
 652             $this->tpl->assign('versionError', escape($exc->getMessage()));
 653         }
 654
 655         $this->tpl->assign('feedurl', escape(index_url($_SERVER)));
 656         $searchcrits = ''; // Search criteria
 657         if (!empty($_GET['searchtags'])) {
 658             $searchcrits .= '&searchtags=' . urlencode($_GET['searchtags']);
 659         }
 660         elseif (!empty($_GET['searchterm'])) {
 661             $searchcrits .= '&searchterm=' . urlencode($_GET['searchterm']);
 662         }
 663         $this->tpl->assign('searchcrits', $searchcrits);
 664         $this->tpl->assign('source', index_url($_SERVER));
 665         $this->tpl->assign('version', shaarli_version);
 666         $this->tpl->assign('scripturl', index_url($_SERVER));
 667         $this->tpl->assign('pagetitle', 'Shaarli');
 668         $this->tpl->assign('privateonly', !empty($_SESSION['privateonly'])); // Show only private links?
 669         if (!empty($GLOBALS['title'])) {
 670             $this->tpl->assign('pagetitle', $GLOBALS['title']);
 671         }
 672         if (!empty($GLOBALS['titleLink'])) {
 673             $this->tpl->assign('titleLink', $GLOBALS['titleLink']);
 674         }
 675         if (!empty($GLOBALS['pagetitle'])) {
 676             $this->tpl->assign('pagetitle', $GLOBALS['pagetitle']);
 677         }
 678         $this->tpl->assign('shaarlititle', empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title']);
 679         if (!empty($GLOBALS['plugin_errors'])) {
 680             $this->tpl->assign('plugin_errors', $GLOBALS['plugin_errors']);
 681         }
 682     }
 683
 684     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 685     public function assign($what,$where)
 686     {
 687         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 688         $this->tpl->assign($what,$where);
 689     }
 690
 691     // Render a specific page (using a template).
 692     // e.g. pb.renderPage('picwall')
 693     public function renderPage($page)
 694     {
 695         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 696         $this->tpl->draw($page);
 697     }
 698 }
 699
 700 // ------------------------------------------------------------------------------------------
 701 // Output the last N links in RSS 2.0 format.
 702 function showRSS()
 703 {
 704     header('Content-Type: application/rss+xml; charset=utf-8');
 705
 706     // $usepermalink : If true, use permalink instead of final link.
 707     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=rss&permalinks
 708     // Also enabled through a config option
 709     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 710
 711     // Cache system
 712     $query = $_SERVER["QUERY_STRING"];
 713     $cache = new CachedPage(
 714         $GLOBALS['config']['PAGECACHE'],
 715         page_url($_SERVER),
 716         startsWith($query,'do=rss') && !isLoggedIn()
 717     );
 718     $cached = $cache->cachedVersion();
 719     if (! empty($cached)) {
 720         echo $cached;
 721         exit;
 722     }
 723
 724     // If cached was not found (or not usable), then read the database and build the response:
 725     $LINKSDB = new LinkDB(
 726         $GLOBALS['config']['DATASTORE'],
 727         isLoggedIn(),
 728         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 729         $GLOBALS['redirector']
 730     );
 731     // Read links from database (and filter private links if user it not logged in).
 732
 733     // Optionally filter the results:
 734     if (!empty($_GET['searchterm'])) {
 735         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
 736     }
 737     elseif (!empty($_GET['searchtags'])) {
 738         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
 739     }
 740     else {
 741         $linksToDisplay = $LINKSDB;
 742     }
 743
 744     $nblinksToDisplay = 50;  // Number of links to display.
 745     // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 746     if (!empty($_GET['nb'])) {
 747         $nblinksToDisplay = $_GET['nb'] == 'all' ? count($linksToDisplay) : max(intval($_GET['nb']), 1);
 748     }
 749
 750     $pageaddr = escape(index_url($_SERVER));
 751     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 752     echo '<channel><title>'.$GLOBALS['title'].'</title><link>'.$pageaddr.'</link>';
 753     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 754     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 755     {
 756         echo '<!-- PubSubHubbub Discovery -->';
 757         echo '<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 758         echo '<link rel="self" href="'.$pageaddr.'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 759         echo '<!-- End Of PubSubHubbub Discovery -->';
 760     }
 761     $i=0;
 762     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 763     while ($i<$nblinksToDisplay && $i<count($keys))
 764     {
 765         $link = $linksToDisplay[$keys[$i]];
 766         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 767         $rfc822date = linkdate2rfc822($link['linkdate']);
 768         $absurl = $link['url'];
 769         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 770         if ($usepermalinks===true)
 771             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 772         else
 773             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 774         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.escape($rfc822date)."</pubDate>\n";
 775         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 776         {
 777             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.$pageaddr.'">'.$tag.'</category>'."\n"; }
 778         }
 779
 780         // Add permalink in description
 781         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 782         // If user wants permalinks first, put the final link in description
 783         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 784         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 785         echo '<description><![CDATA['.
 786             format_description($link['description'], $GLOBALS['redirector']) .
 787             $descriptionlink . ']]></description>' . "\n</item>\n";
 788         $i++;
 789     }
 790     echo '</channel></rss><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 791
 792     $cache->cache(ob_get_contents());
 793     ob_end_flush();
 794     exit;
 795 }
 796
 797 // ------------------------------------------------------------------------------------------
 798 // Output the last N links in ATOM format.
 799 function showATOM()
 800 {
 801     header('Content-Type: application/atom+xml; charset=utf-8');
 802
 803     // $usepermalink : If true, use permalink instead of final link.
 804     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
 805     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 806
 807     // Cache system
 808     $query = $_SERVER["QUERY_STRING"];
 809     $cache = new CachedPage(
 810         $GLOBALS['config']['PAGECACHE'],
 811         page_url($_SERVER),
 812         startsWith($query,'do=atom') && !isLoggedIn()
 813     );
 814     $cached = $cache->cachedVersion();
 815     if (!empty($cached)) {
 816         echo $cached;
 817         exit;
 818     }
 819
 820     // If cached was not found (or not usable), then read the database and build the response:
 821     // Read links from database (and filter private links if used it not logged in).
 822     $LINKSDB = new LinkDB(
 823         $GLOBALS['config']['DATASTORE'],
 824         isLoggedIn(),
 825         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 826         $GLOBALS['redirector']
 827     );
 828
 829     // Optionally filter the results:
 830     if (!empty($_GET['searchterm'])) {
 831         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
 832     }
 833     else if (!empty($_GET['searchtags'])) {
 834         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
 835     }
 836     else {
 837         $linksToDisplay = $LINKSDB;
 838     }
 839
 840     $nblinksToDisplay = 50;  // Number of links to display.
 841     // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 842     if (!empty($_GET['nb'])) {
 843         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max(intval($_GET['nb']), 1);
 844     }
 845
 846     $pageaddr=escape(index_url($_SERVER));
 847     $latestDate = '';
 848     $entries='';
 849     $i=0;
 850     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 851     while ($i<$nblinksToDisplay && $i<count($keys))
 852     {
 853         $link = $linksToDisplay[$keys[$i]];
 854         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 855         $iso8601date = linkdate2iso8601($link['linkdate']);
 856         $latestDate = max($latestDate,$iso8601date);
 857         $absurl = $link['url'];
 858         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 859         $entries.='<entry><title>'.$link['title'].'</title>';
 860         if ($usepermalinks===true)
 861             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
 862         else
 863             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
 864         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.escape($iso8601date).'</updated>';
 865
 866         // Add permalink in description
 867         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 868         // If user wants permalinks first, put the final link in description
 869         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 870         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 871
 872         $entries .= '<content type="html"><![CDATA['.
 873             format_description($link['description'], $GLOBALS['redirector']) .
 874             $descriptionlink . "]]></content>\n";
 875         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
 876         {
 877             foreach(explode(' ',$link['tags']) as $tag)
 878                 { $entries.='<category scheme="'.$pageaddr.'" term="'.$tag.'" />'."\n"; }
 879         }
 880         $entries.="</entry>\n";
 881         $i++;
 882     }
 883     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
 884     $feed.='<title>'.$GLOBALS['title'].'</title>';
 885     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.escape($latestDate).'</updated>';
 886     $feed.='<link rel="self" href="'.escape(server_url($_SERVER).$_SERVER["REQUEST_URI"]).'" />';
 887     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 888     {
 889         $feed.='<!-- PubSubHubbub Discovery -->';
 890         $feed.='<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
 891         $feed.='<!-- End Of PubSubHubbub Discovery -->';
 892     }
 893     $feed.='<author><name>'.$pageaddr.'</name><uri>'.$pageaddr.'</uri></author>';
 894     $feed.='<id>'.$pageaddr.'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
 895     $feed.=$entries;
 896     $feed.='</feed><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 897     echo $feed;
 898
 899     $cache->cache(ob_get_contents());
 900     ob_end_flush();
 901     exit;
 902 }
 903
 904 // ------------------------------------------------------------------------------------------
 905 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 906 // Gives the last 7 days (which have links).
 907 // This RSS feed cannot be filtered.
 908 function showDailyRSS() {
 909     // Cache system
 910     $query = $_SERVER["QUERY_STRING"];
 911     $cache = new CachedPage(
 912         $GLOBALS['config']['PAGECACHE'],
 913         page_url($_SERVER),
 914         startsWith($query,'do=dailyrss') && !isLoggedIn()
 915     );
 916     $cached = $cache->cachedVersion();
 917     if (!empty($cached)) {
 918         echo $cached;
 919         exit;
 920     }
 921
 922     // If cached was not found (or not usable), then read the database and build the response:
 923     // Read links from database (and filter private links if used it not logged in).
 924     $LINKSDB = new LinkDB(
 925         $GLOBALS['config']['DATASTORE'],
 926         isLoggedIn(),
 927         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 928         $GLOBALS['redirector']
 929     );
 930
 931     /* Some Shaarlies may have very few links, so we need to look
 932        back in time (rsort()) until we have enough days ($nb_of_days).
 933     */
 934     $linkdates = array();
 935     foreach ($LINKSDB as $linkdate => $value) {
 936         $linkdates[] = $linkdate;
 937     }
 938     rsort($linkdates);
 939     $nb_of_days = 7; // We take 7 days.
 940     $today = Date('Ymd');
 941     $days = array();
 942
 943     foreach ($linkdates as $linkdate) {
 944         $day = substr($linkdate, 0, 8); // Extract day (without time)
 945         if (strcmp($day,$today) < 0) {
 946             if (empty($days[$day])) {
 947                 $days[$day] = array();
 948             }
 949             $days[$day][] = $linkdate;
 950         }
 951
 952         if (count($days) > $nb_of_days) {
 953             break; // Have we collected enough days?
 954         }
 955     }
 956
 957     // Build the RSS feed.
 958     header('Content-Type: application/rss+xml; charset=utf-8');
 959     $pageaddr = escape(index_url($_SERVER));
 960     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 961     echo '<channel>';
 962     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 963     echo '<link>'. $pageaddr .'</link>';
 964     echo '<description>Daily shared links</description>';
 965     echo '<language>en-en</language>';
 966     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 967
 968     // For each day.
 969     foreach ($days as $day => $linkdates) {
 970         $daydate = linkdate2timestamp($day.'_000000'); // Full text date
 971         $rfc822date = linkdate2rfc822($day.'_000000');
 972         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 973
 974         // Build the HTML body of this RSS entry.
 975         $html = '';
 976         $href = '';
 977         $links = array();
 978
 979         // We pre-format some fields for proper output.
 980         foreach ($linkdates as $linkdate) {
 981             $l = $LINKSDB[$linkdate];
 982             $l['formatedDescription'] = format_description($l['description'], $GLOBALS['redirector']);
 983             $l['thumbnail'] = thumbnail($l['url']);
 984             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
 985             if (startsWith($l['url'], '?')) {
 986                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 987             }
 988             $links[$linkdate] = $l;
 989         }
 990
 991         // Then build the HTML for this day:
 992         $tpl = new RainTPL;
 993         $tpl->assign('title', $GLOBALS['title']);
 994         $tpl->assign('daydate', $daydate);
 995         $tpl->assign('absurl', $absurl);
 996         $tpl->assign('links', $links);
 997         $tpl->assign('rfc822date', escape($rfc822date));
 998         $html = $tpl->draw('dailyrss', $return_string=true);
 999
1000         echo $html . PHP_EOL;
1001     }
1002     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
1003
1004     $cache->cache(ob_get_contents());
1005     ob_end_flush();
1006     exit;
1007 }
1008
1009 /**
1010  * Show the 'Daily' page.
1011  *
1012  * @param PageBuilder $pageBuilder Template engine wrapper.
1013  */
1014 function showDaily($pageBuilder)
1015 {
1016     $LINKSDB = new LinkDB(
1017         $GLOBALS['config']['DATASTORE'],
1018         isLoggedIn(),
1019         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1020         $GLOBALS['redirector']
1021     );
1022
1023     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
1024     if (isset($_GET['day'])) $day=$_GET['day'];
1025
1026     $days = $LINKSDB->days();
1027     $i = array_search($day,$days);
1028     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
1029     $previousday='';
1030     $nextday='';
1031     if ($i!==false)
1032     {
1033         if ($i>=1) $previousday=$days[$i-1];
1034         if ($i<count($days)-1) $nextday=$days[$i+1];
1035     }
1036
1037     try {
1038         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_DAY, $day);
1039     } catch (Exception $exc) {
1040         error_log($exc);
1041         $linksToDisplay = array();
1042     }
1043
1044     // We pre-format some fields for proper output.
1045     foreach($linksToDisplay as $key=>$link)
1046     {
1047
1048         $taglist = explode(' ',$link['tags']);
1049         uasort($taglist, 'strcasecmp');
1050         $linksToDisplay[$key]['taglist']=$taglist;
1051         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $GLOBALS['redirector']);
1052         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
1053         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
1054     }
1055
1056     /* We need to spread the articles on 3 columns.
1057        I did not want to use a JavaScript lib like http://masonry.desandro.com/
1058        so I manually spread entries with a simple method: I roughly evaluate the
1059        height of a div according to title and description length.
1060     */
1061     $columns=array(array(),array(),array()); // Entries to display, for each column.
1062     $fill=array(0,0,0);  // Rough estimate of columns fill.
1063     foreach($linksToDisplay as $key=>$link)
1064     {
1065         // Roughly estimate length of entry (by counting characters)
1066         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
1067         // Description: 836 characters gives roughly 342 pixel height.
1068         // This is not perfect, but it's usually OK.
1069         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
1070         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
1071         // Then put in column which is the less filled:
1072         $smallest=min($fill); // find smallest value in array.
1073         $index=array_search($smallest,$fill); // find index of this smallest value.
1074         array_push($columns[$index],$link); // Put entry in this column.
1075         $fill[$index]+=$length;
1076     }
1077
1078     $data = array(
1079         'linksToDisplay' => $linksToDisplay,
1080         'linkcount' => count($LINKSDB),
1081         'cols' => $columns,
1082         'day' => linkdate2timestamp($day.'_000000'),
1083         'previousday' => $previousday,
1084         'nextday' => $nextday,
1085     );
1086     $pluginManager = PluginManager::getInstance();
1087     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
1088
1089     foreach ($data as $key => $value) {
1090         $pageBuilder->assign($key, $value);
1091     }
1092
1093     $pageBuilder->renderPage('daily');
1094     exit;
1095 }
1096
1097 // Renders the linklist
1098 function showLinkList($PAGE, $LINKSDB) {
1099     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1100     $PAGE->renderPage('linklist');
1101 }
1102
1103
1104 // ------------------------------------------------------------------------------------------
1105 // Render HTML page (according to URL parameters and user rights)
1106 function renderPage()
1107 {
1108     $LINKSDB = new LinkDB(
1109         $GLOBALS['config']['DATASTORE'],
1110         isLoggedIn(),
1111         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1112         $GLOBALS['redirector']
1113     );
1114
1115     $PAGE = new pageBuilder;
1116
1117     // Determine which page will be rendered.
1118     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
1119     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
1120
1121     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
1122     // Then assign generated data to RainTPL.
1123     $common_hooks = array(
1124         'header',
1125         'footer',
1126         'includes',
1127     );
1128     $pluginManager = PluginManager::getInstance();
1129     foreach($common_hooks as $name) {
1130         $plugin_data = array();
1131         $pluginManager->executeHooks('render_' . $name, $plugin_data,
1132             array(
1133                 'target' => $targetPage,
1134                 'loggedin' => isLoggedIn()
1135             )
1136         );
1137         $PAGE->assign('plugins_' . $name, $plugin_data);
1138     }
1139
1140     // -------- Display login form.
1141     if ($targetPage == Router::$PAGE_LOGIN)
1142     {
1143         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1144         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1145         $PAGE->assign('token',$token);
1146         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
1147         $PAGE->renderPage('loginform');
1148         exit;
1149     }
1150     // -------- User wants to logout.
1151     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1152     {
1153         invalidateCaches($GLOBALS['config']['PAGECACHE']);
1154         logout();
1155         header('Location: ?');
1156         exit;
1157     }
1158
1159     // -------- Picture wall
1160     if ($targetPage == Router::$PAGE_PICWALL)
1161     {
1162         // Optionally filter the results:
1163         if (!empty($_GET['searchterm'])) {
1164             $links = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
1165         }
1166         elseif (! empty($_GET['searchtags'])) {
1167             $links = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
1168         }
1169         else {
1170             $links = $LINKSDB;
1171         }
1172
1173         $linksToDisplay = array();
1174
1175         // Get only links which have a thumbnail.
1176         foreach($links as $link)
1177         {
1178             $permalink='?'.escape(smallhash($link['linkdate']));
1179             $thumb=lazyThumbnail($link['url'],$permalink);
1180             if ($thumb!='') // Only output links which have a thumbnail.
1181             {
1182                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1183                 $linksToDisplay[]=$link; // Add to array.
1184             }
1185         }
1186
1187         $data = array(
1188             'linkcount' => count($LINKSDB),
1189             'linksToDisplay' => $linksToDisplay,
1190         );
1191         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
1192
1193         foreach ($data as $key => $value) {
1194             $PAGE->assign($key, $value);
1195         }
1196
1197         $PAGE->renderPage('picwall');
1198         exit;
1199     }
1200
1201     // -------- Tag cloud
1202     if ($targetPage == Router::$PAGE_TAGCLOUD)
1203     {
1204         $tags= $LINKSDB->allTags();
1205
1206         // We sort tags alphabetically, then choose a font size according to count.
1207         // First, find max value.
1208         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1209         ksort($tags);
1210         $tagList=array();
1211         foreach($tags as $key=>$value)
1212         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1213         {
1214             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1215         }
1216
1217         $data = array(
1218             'linkcount' => count($LINKSDB),
1219             'tags' => $tagList,
1220         );
1221         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
1222
1223         foreach ($data as $key => $value) {
1224             $PAGE->assign($key, $value);
1225         }
1226
1227         $PAGE->renderPage('tagcloud');
1228         exit;
1229     }
1230
1231     // Daily page.
1232     if ($targetPage == Router::$PAGE_DAILY) {
1233         showDaily($PAGE);
1234     }
1235
1236     // Display openseach plugin (XML)
1237     if ($targetPage == Router::$PAGE_OPENSEARCH) {
1238         header('Content-Type: application/xml; charset=utf-8');
1239         $PAGE->assign('serverurl', index_url($_SERVER));
1240         $PAGE->renderPage('opensearch');
1241         exit;
1242     }
1243
1244     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1245     if (isset($_GET['addtag']))
1246     {
1247         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1248         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1249         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1250
1251         // Prevent redirection loop
1252         if (isset($params['addtag'])) {
1253             unset($params['addtag']);
1254         }
1255
1256         // Check if this tag is already in the search query and ignore it if it is.
1257         // Each tag is always separated by a space
1258         if (isset($params['searchtags'])) {
1259             $current_tags = explode(' ', $params['searchtags']);
1260         } else {
1261             $current_tags = array();
1262         }
1263         $addtag = true;
1264         foreach ($current_tags as $value) {
1265             if ($value === $_GET['addtag']) {
1266                 $addtag = false;
1267                 break;
1268             }
1269         }
1270         // Append the tag if necessary
1271         if (empty($params['searchtags'])) {
1272             $params['searchtags'] = trim($_GET['addtag']);
1273         }
1274         else if ($addtag) {
1275             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1276         }
1277
1278         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1279         header('Location: ?'.http_build_query($params));
1280         exit;
1281     }
1282
1283     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1284     if (isset($_GET['removetag'])) {
1285         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1286         if (empty($_SERVER['HTTP_REFERER'])) {
1287             header('Location: ?');
1288             exit;
1289         }
1290
1291         // In case browser does not send HTTP_REFERER
1292         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1293
1294         // Prevent redirection loop
1295         if (isset($params['removetag'])) {
1296             unset($params['removetag']);
1297         }
1298
1299         if (isset($params['searchtags'])) {
1300             $tags = explode(' ', $params['searchtags']);
1301             $tags=array_diff($tags, array($_GET['removetag'])); // Remove value from array $tags.
1302             if (count($tags)==0) {
1303                 unset($params['searchtags']);
1304             } else {
1305                 $params['searchtags'] = implode(' ',$tags);
1306             }
1307             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1308         }
1309         header('Location: ?'.http_build_query($params));
1310         exit;
1311     }
1312
1313     // -------- User wants to change the number of links per page (linksperpage=...)
1314     if (isset($_GET['linksperpage'])) {
1315         if (is_numeric($_GET['linksperpage'])) {
1316             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1317         }
1318
1319         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1320         exit;
1321     }
1322
1323     // -------- User wants to see only private links (toggle)
1324     if (isset($_GET['privateonly'])) {
1325         if (empty($_SESSION['privateonly'])) {
1326             $_SESSION['privateonly'] = 1; // See only private links
1327         } else {
1328             unset($_SESSION['privateonly']); // See all links
1329         }
1330
1331         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1332         exit;
1333     }
1334
1335     // -------- Handle other actions allowed for non-logged in users:
1336     if (!isLoggedIn())
1337     {
1338         // User tries to post new link but is not logged in:
1339         // Show login screen, then redirect to ?post=...
1340         if (isset($_GET['post']))
1341         {
1342             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1343             exit;
1344         }
1345
1346                 // Same case as above except that user tried to access ?do=addlink without being logged in
1347                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1348                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1349                         header('Location: ?do=login&post=');
1350                         exit;
1351                 }
1352         showLinkList($PAGE, $LINKSDB);
1353         if (isset($_GET['edit_link'])) {
1354             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1355             exit;
1356         }
1357
1358         exit; // Never remove this one! All operations below are reserved for logged in user.
1359     }
1360
1361     // -------- All other functions are reserved for the registered user:
1362
1363     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1364     if ($targetPage == Router::$PAGE_TOOLS)
1365     {
1366         $data = array(
1367             'linkcount' => count($LINKSDB),
1368             'pageabsaddr' => index_url($_SERVER),
1369         );
1370         $pluginManager->executeHooks('render_tools', $data);
1371
1372         foreach ($data as $key => $value) {
1373             $PAGE->assign($key, $value);
1374         }
1375
1376         $PAGE->renderPage('tools');
1377         exit;
1378     }
1379
1380     // -------- User wants to change his/her password.
1381     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1382     {
1383         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1384         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1385         {
1386             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1387
1388             // Make sure old password is correct.
1389             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1390             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1391             // Save new password
1392             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1393             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1394             try {
1395                 writeConfig($GLOBALS, isLoggedIn());
1396             }
1397             catch(Exception $e) {
1398                 error_log(
1399                     'ERROR while writing config file after changing password.' . PHP_EOL .
1400                     $e->getMessage()
1401                 );
1402
1403                 // TODO: do not handle exceptions/errors in JS.
1404                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1405                 exit;
1406             }
1407             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1408             exit;
1409         }
1410         else // show the change password form.
1411         {
1412             $PAGE->assign('linkcount',count($LINKSDB));
1413             $PAGE->assign('token',getToken());
1414             $PAGE->renderPage('changepassword');
1415             exit;
1416         }
1417     }
1418
1419     // -------- User wants to change configuration
1420     if ($targetPage == Router::$PAGE_CONFIGURE)
1421     {
1422         if (!empty($_POST['title']) )
1423         {
1424             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1425             $tz = 'UTC';
1426             if (!empty($_POST['continent']) && !empty($_POST['city']))
1427                 if (isTimeZoneValid($_POST['continent'],$_POST['city']))
1428                     $tz = $_POST['continent'].'/'.$_POST['city'];
1429             $GLOBALS['timezone'] = $tz;
1430             $GLOBALS['title']=$_POST['title'];
1431             $GLOBALS['titleLink']=$_POST['titleLink'];
1432             $GLOBALS['redirector']=$_POST['redirector'];
1433             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1434             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1435             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1436             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1437             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1438             try {
1439                 writeConfig($GLOBALS, isLoggedIn());
1440             }
1441             catch(Exception $e) {
1442                 error_log(
1443                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1444                     $e->getMessage()
1445                 );
1446
1447                 // TODO: do not handle exceptions/errors in JS.
1448                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1449                 exit;
1450             }
1451             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1452             exit;
1453         }
1454         else // Show the configuration form.
1455         {
1456             $PAGE->assign('linkcount',count($LINKSDB));
1457             $PAGE->assign('token',getToken());
1458             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1459             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1460             list($timezone_form, $timezone_js) = generateTimeZoneForm($GLOBALS['timezone']);
1461             $PAGE->assign('timezone_form', $timezone_form);
1462             $PAGE->assign('timezone_js',$timezone_js);
1463             $PAGE->renderPage('configure');
1464             exit;
1465         }
1466     }
1467
1468     // -------- User wants to rename a tag or delete it
1469     if ($targetPage == Router::$PAGE_CHANGETAG)
1470     {
1471         if (empty($_POST['fromtag']))
1472         {
1473             $PAGE->assign('linkcount',count($LINKSDB));
1474             $PAGE->assign('token',getToken());
1475             $PAGE->assign('tags', $LINKSDB->allTags());
1476             $PAGE->renderPage('changetag');
1477             exit;
1478         }
1479         if (!tokenOk($_POST['token'])) die('Wrong token.');
1480
1481         // Delete a tag:
1482         if (!empty($_POST['deletetag']) && !empty($_POST['fromtag']))
1483         {
1484             $needle=trim($_POST['fromtag']);
1485             // True for case-sensitive tag search.
1486             $linksToAlter = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $needle, true);
1487             foreach($linksToAlter as $key=>$value)
1488             {
1489                 $tags = explode(' ',trim($value['tags']));
1490                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1491                 $value['tags']=trim(implode(' ',$tags));
1492                 $LINKSDB[$key]=$value;
1493             }
1494             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1495             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1496             exit;
1497         }
1498
1499         // Rename a tag:
1500         if (!empty($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag']))
1501         {
1502             $needle=trim($_POST['fromtag']);
1503             // True for case-sensitive tag search.
1504             $linksToAlter = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $needle, true);
1505             foreach($linksToAlter as $key=>$value)
1506             {
1507                 $tags = explode(' ',trim($value['tags']));
1508                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1509                 $value['tags']=trim(implode(' ',$tags));
1510                 $LINKSDB[$key]=$value;
1511             }
1512             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1513             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1514             exit;
1515         }
1516     }
1517
1518     // -------- User wants to add a link without using the bookmarklet: Show form.
1519     if ($targetPage == Router::$PAGE_ADDLINK)
1520     {
1521         $PAGE->assign('linkcount',count($LINKSDB));
1522         $PAGE->renderPage('addlink');
1523         exit;
1524     }
1525
1526     // -------- User clicked the "Save" button when editing a link: Save link to database.
1527     if (isset($_POST['save_edit']))
1528     {
1529         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1530         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1531         $tags = implode(' ', array_unique(explode(' ', $tags))); // Remove duplicates.
1532         $linkdate=$_POST['lf_linkdate'];
1533         $url = trim($_POST['lf_url']);
1534         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?') && !startsWith($url,'javascript:'))
1535             $url = 'http://'.$url;
1536         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1537                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1538         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1539
1540         $pluginManager->executeHooks('save_link', $link);
1541
1542         $LINKSDB[$linkdate] = $link;
1543         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1544         pubsubhub();
1545
1546         // If we are called from the bookmarklet, we must close the popup:
1547         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1548             echo '<script>self.close();</script>';
1549             exit;
1550         }
1551
1552         $returnurl = !empty($_POST['returnurl']) ? escape($_POST['returnurl']): '?';
1553         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1554         $location .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1555         header('Location: '. $location); // After saving the link, redirect to the page the user was on.
1556         exit;
1557     }
1558
1559     // -------- User clicked the "Cancel" button when editing a link.
1560     if (isset($_POST['cancel_edit']))
1561     {
1562         // If we are called from the bookmarklet, we must close the popup:
1563         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1564         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1565         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1566         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1567         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1568         exit;
1569     }
1570
1571     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1572     if (isset($_POST['delete_link']))
1573     {
1574         if (!tokenOk($_POST['token'])) die('Wrong token.');
1575         // We do not need to ask for confirmation:
1576         // - confirmation is handled by JavaScript
1577         // - we are protected from XSRF by the token.
1578         $linkdate=$_POST['lf_linkdate'];
1579
1580         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1581
1582         unset($LINKSDB[$linkdate]);
1583         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // save to disk
1584
1585         // If we are called from the bookmarklet, we must close the popup:
1586         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1587         // Pick where we're going to redirect
1588         // =============================================================
1589         // Basically, we can't redirect to where we were previously if it was a permalink
1590         // or an edit_link, because it would 404.
1591         // Cases:
1592         //    - /             : nothing in $_GET, redirect to self
1593         //    - /?page        : redirect to self
1594         //    - /?searchterm  : redirect to self (there might be other links)
1595         //    - /?searchtags  : redirect to self
1596         //    - /permalink    : redirect to / (the link does not exist anymore)
1597         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1598         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1599         // redirect is not satisfied, and only then redirect to /
1600         $location = "?";
1601         // Self redirection
1602         if (count($_GET) == 0
1603             || isset($_GET['page'])
1604             || isset($_GET['searchterm'])
1605             || isset($_GET['searchtags'])
1606         ) {
1607             if (isset($_POST['returnurl'])) {
1608                 $location = $_POST['returnurl']; // Handle redirects given by the form
1609             } else {
1610                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1611             }
1612         }
1613
1614         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1615         exit;
1616     }
1617
1618     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1619     if (isset($_GET['edit_link']))
1620     {
1621         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1622         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1623         $data = array(
1624             'linkcount' => count($LINKSDB),
1625             'link' => $link,
1626             'link_is_new' => false,
1627             'token' => getToken(),
1628             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1629             'tags' => $LINKSDB->allTags(),
1630         );
1631         $pluginManager->executeHooks('render_editlink', $data);
1632
1633         foreach ($data as $key => $value) {
1634             $PAGE->assign($key, $value);
1635         }
1636
1637         $PAGE->renderPage('editlink');
1638         exit;
1639     }
1640
1641     // -------- User want to post a new link: Display link edit form.
1642     if (isset($_GET['post'])) {
1643         $url = cleanup_url($_GET['post']);
1644
1645         $link_is_new = false;
1646         // Check if URL is not already in database (in this case, we will edit the existing link)
1647         $link = $LINKSDB->getLinkFromUrl($url);
1648         if (!$link)
1649         {
1650             $link_is_new = true;
1651             $linkdate = strval(date('Ymd_His'));
1652             // Get title if it was provided in URL (by the bookmarklet).
1653             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1654             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1655             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1656             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1657             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1658             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1659             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1660                 // Short timeout to keep the application responsive
1661                 list($headers, $data) = get_http_url($url, 4);
1662                 // FIXME: Decode charset according to specified in either 1) HTTP response headers or 2) <head> in html
1663                 if (strpos($headers[0], '200 OK') !== false) {
1664                     // Look for charset in html header.
1665                     preg_match('#<meta .*charset=.*>#Usi', $data, $meta);
1666
1667                     // If found, extract encoding.
1668                     if (!empty($meta[0])) {
1669                         // Get encoding specified in header.
1670                         preg_match('#charset="?(.*)"#si', $meta[0], $enc);
1671                         // If charset not found, use utf-8.
1672                         $html_charset = (!empty($enc[1])) ? strtolower($enc[1]) : 'utf-8';
1673                     }
1674                     else {
1675                         $html_charset = 'utf-8';
1676                     }
1677
1678                     // Extract title
1679                     $title = html_extract_title($data);
1680                     if (!empty($title)) {
1681                         // Re-encode title in utf-8 if necessary.
1682                         $title = ($html_charset == 'iso-8859-1') ? utf8_encode($title) : $title;
1683                     }
1684                 }
1685             }
1686             if ($url == '') {
1687                 $url = '?' . smallHash($linkdate);
1688                 $title = 'Note: ';
1689             }
1690             $link = array(
1691                 'linkdate' => $linkdate,
1692                 'title' => $title,
1693                 'url' => $url,
1694                 'description' => $description,
1695                 'tags' => $tags,
1696                 'private' => $private
1697             );
1698         }
1699
1700         $data = array(
1701             'linkcount' => count($LINKSDB),
1702             'link' => $link,
1703             'link_is_new' => $link_is_new,
1704             'token' => getToken(), // XSRF protection.
1705             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1706             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1707             'tags' => $LINKSDB->allTags(),
1708         );
1709         $pluginManager->executeHooks('render_editlink', $data);
1710
1711         foreach ($data as $key => $value) {
1712             $PAGE->assign($key, $value);
1713         }
1714
1715         $PAGE->renderPage('editlink');
1716         exit;
1717     }
1718
1719     // -------- Export as Netscape Bookmarks HTML file.
1720     if ($targetPage == Router::$PAGE_EXPORT)
1721     {
1722         if (empty($_GET['what']))
1723         {
1724             $PAGE->assign('linkcount',count($LINKSDB));
1725             $PAGE->renderPage('export');
1726             exit;
1727         }
1728         $exportWhat=$_GET['what'];
1729         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1730
1731         header('Content-Type: text/html; charset=utf-8');
1732         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1733         $currentdate=date('Y/m/d H:i:s');
1734         echo <<<HTML
1735 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1736 <!-- This is an automatically generated file.
1737      It will be read and overwritten.
1738      DO NOT EDIT! -->
1739 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1740 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1741 <TITLE>Bookmarks</TITLE>
1742 <H1>Bookmarks</H1>
1743 HTML;
1744         foreach($LINKSDB as $link)
1745         {
1746             if ($exportWhat=='all' ||
1747                ($exportWhat=='private' && $link['private']!=0) ||
1748                ($exportWhat=='public' && $link['private']==0))
1749             {
1750                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1751                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1752                 echo '>'.$link['title']."</A>\n";
1753                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1754             }
1755         }
1756                 exit;
1757     }
1758
1759     // -------- User is uploading a file for import
1760     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1761     {
1762         // If file is too big, some form field may be missing.
1763         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1764         {
1765             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1766             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1767             exit;
1768         }
1769         if (!tokenOk($_POST['token'])) die('Wrong token.');
1770         importFile();
1771         exit;
1772     }
1773
1774     // -------- Show upload/import dialog:
1775     if ($targetPage == Router::$PAGE_IMPORT)
1776     {
1777         $PAGE->assign('linkcount',count($LINKSDB));
1778         $PAGE->assign('token',getToken());
1779         $PAGE->assign('maxfilesize',getMaxFileSize());
1780         $PAGE->renderPage('import');
1781         exit;
1782     }
1783
1784     // -------- Otherwise, simply display search form and links:
1785     showLinkList($PAGE, $LINKSDB);
1786     exit;
1787 }
1788
1789 // -----------------------------------------------------------------------------------------------
1790 // Process the import file form.
1791 function importFile()
1792 {
1793     if (!isLoggedIn()) { die('Not allowed.'); }
1794     $LINKSDB = new LinkDB(
1795         $GLOBALS['config']['DATASTORE'],
1796         isLoggedIn(),
1797         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1798         $GLOBALS['redirector']
1799     );
1800     $filename=$_FILES['filetoupload']['name'];
1801     $filesize=$_FILES['filetoupload']['size'];
1802     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1803     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1804     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1805     $import_count=0;
1806
1807     // Sniff file type:
1808     $type='unknown';
1809     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1810
1811     // Then import the bookmarks.
1812     if ($type=='netscape')
1813     {
1814         // This is a standard Netscape-style bookmark file.
1815         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1816         foreach(explode('<DT>',$data) as $html) // explode is very fast
1817         {
1818             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1819             $d = explode('<DD>',$html);
1820             if (startswith($d[0],'<A '))
1821             {
1822                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1823                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1824                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1825                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1826                 $raw_add_date=0;
1827                 foreach($matches as $m)
1828                 {
1829                     $attr=$m[1]; $value=$m[2];
1830                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1831                     elseif ($attr=='ADD_DATE')
1832                     {
1833                         $raw_add_date=intval($value);
1834                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1835                     }
1836                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1837                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1838                 }
1839                 if ($link['url']!='')
1840                 {
1841                     if ($private==1) $link['private']=1;
1842                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1843                     if ($dblink==false)
1844                     {  // Link not in database, let's import it...
1845                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1846
1847                        // Make sure date/time is not already used by another link.
1848                        // (Some bookmark files have several different links with the same ADD_DATE)
1849                        // We increment date by 1 second until we find a date which is not used in DB.
1850                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1851                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1852                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1853                        $LINKSDB[$link['linkdate']] = $link;
1854                        $import_count++;
1855                     }
1856                     else // Link already present in database.
1857                     {
1858                         if ($overwrite)
1859                         {   // If overwrite is required, we import link data, except date/time.
1860                             $link['linkdate']=$dblink['linkdate'];
1861                             $LINKSDB[$link['linkdate']] = $link;
1862                             $import_count++;
1863                         }
1864                     }
1865
1866                 }
1867             }
1868         }
1869         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1870
1871         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1872     }
1873     else
1874     {
1875         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1876     }
1877 }
1878
1879 // -----------------------------------------------------------------------------------------------
1880 // Template for the list of links (<div id="linklist">)
1881 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1882 function buildLinkList($PAGE,$LINKSDB)
1883 {
1884     // ---- Filter link database according to parameters
1885     $search_type = '';
1886     $search_crits = '';
1887     $privateonly = !empty($_SESSION['privateonly']) ? true : false;
1888
1889     // Fulltext search
1890     if (isset($_GET['searchterm'])) {
1891         $search_crits = escape(trim($_GET['searchterm']));
1892         $search_type = LinkFilter::$FILTER_TEXT;
1893         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits, false, $privateonly);
1894     }
1895     // Search by tag
1896     elseif (isset($_GET['searchtags'])) {
1897         $search_crits = explode(' ', escape(trim($_GET['searchtags'])));
1898         $search_type = LinkFilter::$FILTER_TAG;
1899         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits, false, $privateonly);
1900     }
1901     // Detect smallHashes in URL.
1902     elseif (isset($_SERVER['QUERY_STRING'])
1903         && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/', $_SERVER['QUERY_STRING'])) {
1904         $search_type = LinkFilter::$FILTER_HASH;
1905         $search_crits = substr(trim($_SERVER["QUERY_STRING"], '/'), 0, 6);
1906         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits);
1907
1908         if (count($linksToDisplay) == 0) {
1909             header($_SERVER['SERVER_PROTOCOL'] . ' 404 Not Found');
1910             echo '<h1>404 Not found.</h1>Oh crap.
1911                   The link you are trying to reach does not exist or has been deleted.';
1912             echo '<br>Would you mind <a href="?">clicking here</a>?';
1913             exit;
1914         }
1915     }
1916     // Otherwise, display without filtering.
1917     else {
1918         $linksToDisplay = $LINKSDB->filter('', '', false, $privateonly);
1919     }
1920
1921     // ---- Handle paging.
1922     $keys = array();
1923     foreach ($linksToDisplay as $key => $value) {
1924         $keys[] = $key;
1925     }
1926
1927     // If there is only a single link, we change on-the-fly the title of the page.
1928     if (count($linksToDisplay) == 1) {
1929         $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1930     }
1931
1932     // Select articles according to paging.
1933     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1934     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1935     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1936     $page = $page < 1 ? 1 : $page;
1937     $page = $page > $pagecount ? $pagecount : $page;
1938     // Start index.
1939     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1940     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1941     $linkDisp = array();
1942     while ($i<$end && $i<count($keys))
1943     {
1944         $link = $linksToDisplay[$keys[$i]];
1945         $link['description'] = format_description($link['description'], $GLOBALS['redirector']);
1946         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
1947         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
1948         $link['timestamp'] = linkdate2timestamp($link['linkdate']);
1949         $taglist = explode(' ', $link['tags']);
1950         uasort($taglist, 'strcasecmp');
1951         $link['taglist'] = $taglist;
1952         $link['shorturl'] = smallHash($link['linkdate']);
1953         // Check for both signs of a note: starting with ? and 7 chars long.
1954         if ($link['url'][0] === '?' &&
1955             strlen($link['url']) === 7) {
1956             $link['url'] = index_url($_SERVER) . $link['url'];
1957         }
1958
1959         $linkDisp[$keys[$i]] = $link;
1960         $i++;
1961     }
1962
1963     // Compute paging navigation
1964     $searchterm = empty($_GET['searchterm']) ? '' : '&searchterm=' . $_GET['searchterm'];
1965     $searchtags = empty($_GET['searchtags']) ? '' : '&searchtags=' . $_GET['searchtags'];
1966     $previous_page_url = '';
1967     if ($i != count($keys)) {
1968         $previous_page_url = '?page=' . ($page+1) . $searchterm . $searchtags;
1969     }
1970     $next_page_url='';
1971     if ($page>1) {
1972         $next_page_url = '?page=' . ($page-1) . $searchterm . $searchtags;
1973     }
1974
1975     $token = '';
1976     if (isLoggedIn()) {
1977         $token = getToken();
1978     }
1979
1980     // Fill all template fields.
1981     $data = array(
1982         'linkcount' => count($LINKSDB),
1983         'previous_page_url' => $previous_page_url,
1984         'next_page_url' => $next_page_url,
1985         'page_current' => $page,
1986         'page_max' => $pagecount,
1987         'result_count' => count($linksToDisplay),
1988         'search_type' => $search_type,
1989         'search_crits' => $search_crits,
1990         'redirector' => empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'],  // Optional redirector URL.
1991         'token' => $token,
1992         'links' => $linkDisp,
1993         'tags' => $LINKSDB->allTags(),
1994     );
1995     // FIXME! temporary fix - see #399.
1996     if (!empty($GLOBALS['pagetitle']) && count($linkDisp) == 1) {
1997         $data['pagetitle'] = $GLOBALS['pagetitle'];
1998     }
1999
2000     $pluginManager = PluginManager::getInstance();
2001     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
2002
2003     foreach ($data as $key => $value) {
2004         $PAGE->assign($key, $value);
2005     }
2006
2007     return;
2008 }
2009
2010 // Compute the thumbnail for a link.
2011 //
2012 // With a link to the original URL.
2013 // Understands various services (youtube.com...)
2014 // Input: $url = URL for which the thumbnail must be found.
2015 //        $href = if provided, this URL will be followed instead of $url
2016 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
2017 // Some of them may be missing.
2018 // Return an empty array if no thumbnail available.
2019 function computeThumbnail($url,$href=false)
2020 {
2021     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
2022     if ($href==false) $href=$url;
2023
2024     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
2025     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
2026     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
2027     $domain = parse_url($url,PHP_URL_HOST);
2028     if ($domain=='youtube.com' || $domain=='www.youtube.com')
2029     {
2030         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
2031         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
2032                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2033     }
2034     if ($domain=='youtu.be') // Youtube short links
2035     {
2036         $path = parse_url($url,PHP_URL_PATH);
2037         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
2038                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2039     }
2040     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
2041     {
2042         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
2043         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
2044                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
2045     }
2046
2047     if ($domain=='imgur.com')
2048     {
2049         $path = parse_url($url,PHP_URL_PATH);
2050         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
2051         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
2052                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2053         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
2054                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2055
2056         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
2057                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2058     }
2059     if ($domain=='i.imgur.com')
2060     {
2061         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
2062         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
2063                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2064     }
2065     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
2066     {
2067         if (strpos($url,'dailymotion.com/video/')!==false)
2068         {
2069             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
2070             return array('src'=>$thumburl,
2071                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
2072         }
2073     }
2074     if (endsWith($domain,'.imageshack.us'))
2075     {
2076         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2077         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2078         {
2079             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
2080             return array('src'=>$thumburl,
2081                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
2082         }
2083     }
2084
2085     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
2086     // So we deport the thumbnail generation in order not to slow down page generation
2087     // (and we also cache the thumbnail)
2088
2089     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
2090
2091     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
2092         || $domain=='vimeo.com'
2093         || $domain=='ted.com' || endsWith($domain,'.ted.com')
2094         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
2095     )
2096     {
2097         if ($domain=='vimeo.com')
2098         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
2099             $path = parse_url($url,PHP_URL_PATH);
2100             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
2101         }
2102         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2103         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
2104             $path = parse_url($url,PHP_URL_PATH);
2105             if (!preg_match('!/\d+.+?!',$path)) return array();
2106         }
2107         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2108         {   // Make sure this TED URL points to a video (/talks/...)
2109             $path = parse_url($url,PHP_URL_PATH);
2110             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
2111         }
2112         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2113         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2114                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2115     }
2116
2117     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
2118     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
2119     // But using the extension will do.
2120     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2121     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2122     {
2123         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2124         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2125                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2126     }
2127     return array(); // No thumbnail.
2128
2129 }
2130
2131
2132 // Returns the HTML code to display a thumbnail for a link
2133 // with a link to the original URL.
2134 // Understands various services (youtube.com...)
2135 // Input: $url = URL for which the thumbnail must be found.
2136 //        $href = if provided, this URL will be followed instead of $url
2137 // Returns '' if no thumbnail available.
2138 function thumbnail($url,$href=false)
2139 {
2140     $t = computeThumbnail($url,$href);
2141     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2142
2143     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
2144     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2145     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2146     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2147     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2148     $html.='></a>';
2149     return $html;
2150 }
2151
2152 // Returns the HTML code to display a thumbnail for a link
2153 // for the picture wall (using lazy image loading)
2154 // Understands various services (youtube.com...)
2155 // Input: $url = URL for which the thumbnail must be found.
2156 //        $href = if provided, this URL will be followed instead of $url
2157 // Returns '' if no thumbnail available.
2158 function lazyThumbnail($url,$href=false)
2159 {
2160     $t = computeThumbnail($url,$href);
2161     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2162
2163     $html='<a href="'.escape($t['href']).'">';
2164
2165     // Lazy image
2166     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
2167
2168     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2169     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2170     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2171     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2172     $html.='>';
2173
2174     // No-JavaScript fallback.
2175     $html.='<noscript><img src="'.escape($t['src']).'"';
2176     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2177     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2178     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2179     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2180     $html.='></noscript></a>';
2181
2182     return $html;
2183 }
2184
2185
2186 // -----------------------------------------------------------------------------------------------
2187 // Installation
2188 // This function should NEVER be called if the file data/config.php exists.
2189 function install()
2190 {
2191     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2192     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2193
2194
2195     // This part makes sure sessions works correctly.
2196     // (Because on some hosts, session.save_path may not be set correctly,
2197     // or we may not have write access to it.)
2198     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2199     {   // Step 2: Check if data in session is correct.
2200         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2201         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2202         echo 'It currently points to '.session_save_path().'<br>';
2203         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2204         echo '<br><a href="?">Click to try again.</a></pre>';
2205         die;
2206     }
2207     if (!isset($_SESSION['session_tested']))
2208     {   // Step 1 : Try to store data in session and reload page.
2209         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2210         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
2211     }
2212     if (isset($_GET['test_session']))
2213     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2214         header('Location: '.index_url($_SERVER));
2215     }
2216
2217
2218     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2219     {
2220         $tz = 'UTC';
2221         if (!empty($_POST['continent']) && !empty($_POST['city'])) {
2222             if (isTimeZoneValid($_POST['continent'], $_POST['city'])) {
2223                 $tz = $_POST['continent'].'/'.$_POST['city'];
2224             }
2225         }
2226         $GLOBALS['timezone'] = $tz;
2227         // Everything is ok, let's create config file.
2228         $GLOBALS['login'] = $_POST['setlogin'];
2229         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2230         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2231         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(index_url($_SERVER)) : $_POST['title'] );
2232         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2233         try {
2234             writeConfig($GLOBALS, isLoggedIn());
2235         }
2236         catch(Exception $e) {
2237             error_log(
2238                     'ERROR while writing config file after installation.' . PHP_EOL .
2239                     $e->getMessage()
2240                 );
2241
2242             // TODO: do not handle exceptions/errors in JS.
2243             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2244             exit;
2245         }
2246         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2247         exit;
2248     }
2249
2250     // Display config form:
2251     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2252     $timezone_html = '';
2253     if ($timezone_form != '') {
2254         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2255     }
2256
2257     $PAGE = new pageBuilder;
2258     $PAGE->assign('timezone_html',$timezone_html);
2259     $PAGE->assign('timezone_js',$timezone_js);
2260     $PAGE->renderPage('install');
2261     exit;
2262 }
2263
2264 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2265    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2266    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2267    This function is called by passing the URL:
2268    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2269    [URL] is the URL of the link (e.g. a flickr page)
2270    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2271    The function below will fetch the image from the webservice and store it in the cache.
2272 */
2273 function genThumbnail()
2274 {
2275     // Make sure the parameters in the URL were generated by us.
2276     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2277     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2278
2279     // Let's see if we don't already have the image for this URL in the cache.
2280     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2281     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2282     {   // We have the thumbnail, just serve it:
2283         header('Content-Type: image/jpeg');
2284         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2285         return;
2286     }
2287     // We may also serve a blank image (if service did not respond)
2288     $blankname=hash('sha1',$_GET['url']).'.gif';
2289     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2290     {
2291         header('Content-Type: image/gif');
2292         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2293         return;
2294     }
2295
2296     // Otherwise, generate the thumbnail.
2297     $url = $_GET['url'];
2298     $domain = parse_url($url,PHP_URL_HOST);
2299
2300     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2301     {
2302         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2303         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2304
2305         // Is this a link to an image, or to a flickr page ?
2306         $imageurl='';
2307         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2308         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2309             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2310             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2311         }
2312         else // This is a flickr page (html)
2313         {
2314             // Get the flickr html page.
2315             list($headers, $data) = get_http_url($url, 20);
2316             if (strpos($headers[0], '200 OK') !== false)
2317             {
2318                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2319                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!',$data,$matches);
2320                 if (!empty($matches[1])) $imageurl=$matches[1];
2321
2322                 // In albums (and some other pages), the link rel="image_src" is not provided,
2323                 // but flickr provides:
2324                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2325                 if ($imageurl=='')
2326                 {
2327                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!',$data,$matches);
2328                     if (!empty($matches[1])) $imageurl=$matches[1];
2329                 }
2330             }
2331         }
2332
2333         if ($imageurl!='')
2334         {   // Let's download the image.
2335             // Image is 240x120, so 10 seconds to download should be enough.
2336             list($headers, $data) = get_http_url($imageurl, 10);
2337             if (strpos($headers[0], '200 OK') !== false) {
2338                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2339                 header('Content-Type: image/jpeg');
2340                 echo $data;
2341                 return;
2342             }
2343         }
2344     }
2345
2346     elseif ($domain=='vimeo.com' )
2347     {
2348         // This is more complex: we have to perform a HTTP request, then parse the result.
2349         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2350         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2351         list($headers, $data) = get_http_url('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2352         if (strpos($headers[0], '200 OK') !== false) {
2353             $t = unserialize($data);
2354             $imageurl = $t[0]['thumbnail_medium'];
2355             // Then we download the image and serve it to our client.
2356             list($headers, $data) = get_http_url($imageurl, 10);
2357             if (strpos($headers[0], '200 OK') !== false) {
2358                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2359                 header('Content-Type: image/jpeg');
2360                 echo $data;
2361                 return;
2362             }
2363         }
2364     }
2365
2366     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2367     {
2368         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2369         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2370         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2371         list($headers, $data) = get_http_url($url, 5);
2372         if (strpos($headers[0], '200 OK') !== false) {
2373             // Extract the link to the thumbnail
2374             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!',$data,$matches);
2375             if (!empty($matches[1]))
2376             {   // Let's download the image.
2377                 $imageurl=$matches[1];
2378                 // No control on image size, so wait long enough
2379                 list($headers, $data) = get_http_url($imageurl, 20);
2380                 if (strpos($headers[0], '200 OK') !== false) {
2381                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2382                     file_put_contents($filepath,$data); // Save image to cache.
2383                     if (resizeImage($filepath))
2384                     {
2385                         header('Content-Type: image/jpeg');
2386                         echo file_get_contents($filepath);
2387                         return;
2388                     }
2389                 }
2390             }
2391         }
2392     }
2393
2394     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2395     {
2396         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2397         // http://xkcd.com/327/
2398         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2399         list($headers, $data) = get_http_url($url, 5);
2400         if (strpos($headers[0], '200 OK') !== false) {
2401             // Extract the link to the thumbnail
2402             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!',$data,$matches);
2403             if (!empty($matches[1]))
2404             {   // Let's download the image.
2405                 $imageurl=$matches[1];
2406                 // No control on image size, so wait long enough
2407                 list($headers, $data) = get_http_url($imageurl, 20);
2408                 if (strpos($headers[0], '200 OK') !== false) {
2409                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2410                     file_put_contents($filepath,$data); // Save image to cache.
2411                     if (resizeImage($filepath))
2412                     {
2413                         header('Content-Type: image/jpeg');
2414                         echo file_get_contents($filepath);
2415                         return;
2416                     }
2417                 }
2418             }
2419         }
2420     }
2421
2422     else
2423     {
2424         // For all other domains, we try to download the image and make a thumbnail.
2425         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2426         list($headers, $data) = get_http_url($url, 30);
2427         if (strpos($headers[0], '200 OK') !== false) {
2428             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2429             file_put_contents($filepath,$data); // Save image to cache.
2430             if (resizeImage($filepath))
2431             {
2432                 header('Content-Type: image/jpeg');
2433                 echo file_get_contents($filepath);
2434                 return;
2435             }
2436         }
2437     }
2438
2439
2440     // Otherwise, return an empty image (8x8 transparent gif)
2441     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2442     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2443     header('Content-Type: image/gif');
2444     echo $blankgif;
2445 }
2446
2447 // Make a thumbnail of the image (to width: 120 pixels)
2448 // Returns true if success, false otherwise.
2449 function resizeImage($filepath)
2450 {
2451     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2452
2453     // Trick: some stupid people rename GIF as JPEG... or else.
2454     // So we really try to open each image type whatever the extension is.
2455     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2456     $im=false;
2457     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2458     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2459     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2460     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2461     $w = imagesx($im);
2462     $h = imagesy($im);
2463     $ystart = 0; $yheight=$h;
2464     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2465     $nw = 120;   // Desired width
2466     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2467     // Resize image:
2468     $im2 = imagecreatetruecolor($nw,$nh);
2469     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2470     imageinterlace($im2,true); // For progressive JPEG.
2471     $tempname=$filepath.'_TEMP.jpg';
2472     imagejpeg($im2, $tempname, 90);
2473     imagedestroy($im);
2474     imagedestroy($im2);
2475     unlink($filepath);
2476     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2477     return true;
2478 }
2479
2480 try {
2481     mergeDeprecatedConfig($GLOBALS, isLoggedIn());
2482 } catch(Exception $e) {
2483     error_log(
2484         'ERROR while merging deprecated options.php file.' . PHP_EOL .
2485         $e->getMessage()
2486     );
2487 }
2488
2489 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2490 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2491 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2492 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2493 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2494 renderPage();
2495 ?>