index.php

   1 <?php
   2 /**
   3  * Shaarli v0.6.0 - 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 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400 ;
  96
  97
  98 /*
  99  * Plugin configuration
 100  *
 101  * Warning: order matters!
 102  *
 103  * These settings may be be overriden in:
 104  *  - data/config.php
 105  *  - each plugin's configuration file
 106  */
 107 //$GLOBALS['config']['ENABLED_PLUGINS'] = array(
 108 //    'qrcode', 'archiveorg', 'readityourself', 'demo_plugin', 'playvideos',
 109 //    'wallabag', 'markdown', 'addlink_toolbar',
 110 //);
 111 $GLOBALS['config']['ENABLED_PLUGINS'] = array('qrcode');
 112
 113 //$GLOBALS['plugins']['WALLABAG_URL'] = 'https://demo.wallabag.org/';
 114
 115 // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
 116 $GLOBALS['config']['PUBSUBHUB_URL'] = '';
 117
 118 /*
 119  * PHP configuration
 120  */
 121 define('shaarli_version', '0.6.0');
 122
 123 // http://server.com/x/shaarli --> /shaarli/
 124 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
 125
 126 // High execution time in case of problematic imports/exports.
 127 ini_set('max_input_time','60');
 128
 129 // Try to set max upload file size and read
 130 ini_set('memory_limit', '128M');
 131 ini_set('post_max_size', '16M');
 132 ini_set('upload_max_filesize', '16M');
 133
 134 // See all error except warnings
 135 error_reporting(E_ALL^E_WARNING);
 136 // See all errors (for debugging only)
 137 //error_reporting(-1);
 138
 139 /*
 140  * User configuration
 141  */
 142 if (is_file($GLOBALS['config']['CONFIG_FILE'])) {
 143     require_once $GLOBALS['config']['CONFIG_FILE'];
 144 }
 145
 146 // Shaarli library
 147 require_once 'application/ApplicationUtils.php';
 148 require_once 'application/Cache.php';
 149 require_once 'application/CachedPage.php';
 150 require_once 'application/FileUtils.php';
 151 require_once 'application/HttpUtils.php';
 152 require_once 'application/LinkDB.php';
 153 require_once 'application/TimeZone.php';
 154 require_once 'application/Url.php';
 155 require_once 'application/Utils.php';
 156 require_once 'application/Config.php';
 157 require_once 'application/PluginManager.php';
 158 require_once 'application/Router.php';
 159
 160 // Ensure the PHP version is supported
 161 try {
 162     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
 163 } catch(Exception $exc) {
 164     header('Content-Type: text/plain; charset=utf-8');
 165     echo $exc->getMessage();
 166     exit;
 167 }
 168
 169 // Force cookie path (but do not change lifetime)
 170 $cookie = session_get_cookie_params();
 171 $cookiedir = '';
 172 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
 173     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
 174 }
 175 // Set default cookie expiration and path.
 176 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 177 // Set session parameters on server side.
 178 // If the user does not access any page within this time, his/her session is considered expired.
 179 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 180 // Use cookies to store session.
 181 ini_set('session.use_cookies', 1);
 182 // Force cookies for session (phpsessionID forbidden in URL).
 183 ini_set('session.use_only_cookies', 1);
 184 // Prevent PHP form using sessionID in URL if cookies are disabled.
 185 ini_set('session.use_trans_sid', false);
 186
 187 session_name('shaarli');
 188 // Start session if needed (Some server auto-start sessions).
 189 if (session_id() == '') {
 190     session_start();
 191 }
 192
 193 // Regenerate session ID if invalid or not defined in cookie.
 194 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 195     session_regenerate_id(true);
 196     $_COOKIE['shaarli'] = session_id();
 197 }
 198
 199 include "inc/rain.tpl.class.php"; //include Rain TPL
 200 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
 201 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
 202
 203 $pluginManager = PluginManager::getInstance();
 204 $pluginManager->load($GLOBALS['config']['ENABLED_PLUGINS']);
 205
 206 ob_start();  // Output buffering for the page cache.
 207
 208
 209 // In case stupid admin has left magic_quotes enabled in php.ini:
 210 if (get_magic_quotes_gpc())
 211 {
 212     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 213     $_POST = array_map('stripslashes_deep', $_POST);
 214     $_GET = array_map('stripslashes_deep', $_GET);
 215     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 216 }
 217
 218 // Prevent caching on client side or proxy: (yes, it's ugly)
 219 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 220 header("Cache-Control: no-store, no-cache, must-revalidate");
 221 header("Cache-Control: post-check=0, pre-check=0", false);
 222 header("Pragma: no-cache");
 223
 224 // Handling of old config file which do not have the new parameters.
 225 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(index_url($_SERVER));
 226 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 227 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 228 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 229 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 230 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 231 // I really need to rewrite Shaarli with a proper configuation manager.
 232
 233 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 234     // Ensure Shaarli has proper access to its resources
 235     $errors = ApplicationUtils::checkResourcePermissions($GLOBALS['config']);
 236
 237     if ($errors != array()) {
 238         $message = '<p>Insufficient permissions:</p><ul>';
 239
 240         foreach ($errors as $error) {
 241             $message .= '<li>'.$error.'</li>';
 242         }
 243         $message .= '</ul>';
 244
 245         header('Content-Type: text/html; charset=utf-8');
 246         echo $message;
 247         exit;
 248     }
 249
 250     // Display the installation form if no existing config is found
 251     install();
 252 }
 253
 254 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 255 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 256 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 257
 258 // a token depending of deployment salt, user password, and the current ip
 259 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 260
 261 autoLocale(); // Sniff browser language and set date format accordingly.
 262 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 263
 264 //==================================================================================================
 265 // Checking session state (i.e. is the user still logged in)
 266 //==================================================================================================
 267
 268 function setup_login_state() {
 269         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 270             return true;
 271         }
 272         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 273         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 274         if (!isset($GLOBALS['login'])) {
 275             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 276             $loginFailure = true;
 277         }
 278         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 279             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 280             !$loginFailure)
 281         {
 282             fillSessionInfo();
 283             $userIsLoggedIn = true;
 284         }
 285         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 286         if (empty($_SESSION['uid']) ||
 287             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 288             time() >= $_SESSION['expires_on'])
 289         {
 290             logout();
 291             $userIsLoggedIn = false;
 292             $loginFailure = true;
 293         }
 294         if (!empty($_SESSION['longlastingsession'])) {
 295             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 296         }
 297         else {
 298             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 299         }
 300         if (!$loginFailure) {
 301             $userIsLoggedIn = true;
 302         }
 303
 304         return $userIsLoggedIn;
 305 }
 306 $userIsLoggedIn = setup_login_state();
 307
 308 // Checks if an update is available for Shaarli.
 309 // (at most once a day, and only for registered user.)
 310 // Output: '' = no new version.
 311 //         other= the available version.
 312 function checkUpdate()
 313 {
 314     if (!isLoggedIn()) return ''; // Do not check versions for visitors.
 315     if (empty($GLOBALS['config']['ENABLE_UPDATECHECK'])) return ''; // Do not check if the user doesn't want to.
 316
 317     // Get latest version number at most once a day.
 318     if (!is_file($GLOBALS['config']['UPDATECHECK_FILENAME']) || (filemtime($GLOBALS['config']['UPDATECHECK_FILENAME'])<time()-($GLOBALS['config']['UPDATECHECK_INTERVAL'])))
 319     {
 320         $version = shaarli_version;
 321         list($headers, $data) = get_http_url('https://raw.githubusercontent.com/shaarli/Shaarli/master/shaarli_version.php', 2);
 322         if (strpos($headers[0], '200 OK') !== false) {
 323             $version = str_replace(' */ ?>', '', str_replace('<?php /* ', '', $data));
 324         }
 325         // If failed, never mind. We don't want to bother the user with that.
 326         file_put_contents($GLOBALS['config']['UPDATECHECK_FILENAME'],$version); // touch file date
 327     }
 328     // Compare versions:
 329     $newestversion=file_get_contents($GLOBALS['config']['UPDATECHECK_FILENAME']);
 330     if (version_compare($newestversion,shaarli_version)==1) return $newestversion;
 331     return '';
 332 }
 333
 334
 335 // -----------------------------------------------------------------------------------------------
 336 // Log to text file
 337 function logm($message)
 338 {
 339     $t = strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n";
 340     file_put_contents($GLOBAL['config']['LOG_FILE'], $t, FILE_APPEND);
 341 }
 342
 343 // ------------------------------------------------------------------------------------------
 344 // Sniff browser language to display dates in the right format automatically.
 345 // (Note that is may not work on your server if the corresponding local is not installed.)
 346 function autoLocale()
 347 {
 348     $attempts = array('en_US'); // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 349     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 350     {   // (It's a bit crude, but it works very well. Preferred language is always presented first.)
 351         if (preg_match('/([a-z]{2})-?([a-z]{2})?/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) {
 352             $loc = $matches[1] . (!empty($matches[2]) ? '_' . strtoupper($matches[2]) : '');
 353             $attempts = array($loc.'.UTF-8', $loc, str_replace('_', '-', $loc).'.UTF-8', str_replace('_', '-', $loc),
 354                 $loc . '_' . strtoupper($loc).'.UTF-8', $loc . '_' . strtoupper($loc),
 355                 $loc . '_' . $loc.'.UTF-8', $loc . '_' . $loc, $loc . '-' . strtoupper($loc).'.UTF-8',
 356                 $loc . '-' . strtoupper($loc), $loc . '-' . $loc.'.UTF-8', $loc . '-' . $loc);
 357         }
 358     }
 359     setlocale(LC_TIME, $attempts);  // LC_TIME = Set local for date/time format only.
 360 }
 361
 362 // ------------------------------------------------------------------------------------------
 363 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 364 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 365 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 366 function pubsubhub()
 367 {
 368     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 369     {
 370        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 371        $topic_url = array (
 372                        index_url($_SERVER).'?do=atom',
 373                        index_url($_SERVER).'?do=rss'
 374                     );
 375        $p->publish_update($topic_url);
 376     }
 377 }
 378
 379 // ------------------------------------------------------------------------------------------
 380 // Session management
 381
 382 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 383 function allIPs()
 384 {
 385     $ip = $_SERVER["REMOTE_ADDR"];
 386     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 387     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 388     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 389     return $ip;
 390 }
 391
 392 function fillSessionInfo() {
 393         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 394         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 395         $_SESSION['username']=$GLOBALS['login'];
 396         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 397 }
 398
 399 // Check that user/password is correct.
 400 function check_auth($login,$password)
 401 {
 402     $hash = sha1($password.$login.$GLOBALS['salt']);
 403     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 404     {   // Login/password is correct.
 405                 fillSessionInfo();
 406         logm('Login successful');
 407         return True;
 408     }
 409     logm('Login failed for user '.$login);
 410     return False;
 411 }
 412
 413 // Returns true if the user is logged in.
 414 function isLoggedIn()
 415 {
 416     global $userIsLoggedIn;
 417     return $userIsLoggedIn;
 418 }
 419
 420 // Force logout.
 421 function logout() {
 422     if (isset($_SESSION)) {
 423         unset($_SESSION['uid']);
 424         unset($_SESSION['ip']);
 425         unset($_SESSION['username']);
 426         unset($_SESSION['privateonly']);
 427     }
 428     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 429 }
 430
 431
 432 // ------------------------------------------------------------------------------------------
 433 // Brute force protection system
 434 // Several consecutive failed logins will ban the IP address for 30 minutes.
 435 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?>");
 436 include $GLOBALS['config']['IPBANS_FILENAME'];
 437 // Signal a failed login. Will ban the IP if too many failures:
 438 function ban_loginFailed()
 439 {
 440     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 441     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 442     $gb['FAILURES'][$ip]++;
 443     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 444     {
 445         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 446         logm('IP address banned from login');
 447     }
 448     $GLOBALS['IPBANS'] = $gb;
 449     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 450 }
 451
 452 // Signals a successful login. Resets failed login counter.
 453 function ban_loginOk()
 454 {
 455     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 456     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 457     $GLOBALS['IPBANS'] = $gb;
 458     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 459 }
 460
 461 // Checks if the user CAN login. If 'true', the user can try to login.
 462 function ban_canLogin()
 463 {
 464     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 465     if (isset($gb['BANS'][$ip]))
 466     {
 467         // User is banned. Check if the ban has expired:
 468         if ($gb['BANS'][$ip]<=time())
 469         {   // Ban expired, user can try to login again.
 470             logm('Ban lifted.');
 471             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 472             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 473             return true; // Ban has expired, user can login.
 474         }
 475         return false; // User is banned.
 476     }
 477     return true; // User is not banned.
 478 }
 479
 480 // ------------------------------------------------------------------------------------------
 481 // Process login form: Check if login/password is correct.
 482 if (isset($_POST['login']))
 483 {
 484     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 485     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 486     {   // Login/password is OK.
 487         ban_loginOk();
 488         // If user wants to keep the session cookie even after the browser closes:
 489         if (!empty($_POST['longlastingsession']))
 490         {
 491                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 492             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 493             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 494
 495             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 496             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 497             // Note: Never forget the trailing slash on the cookie path!
 498             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 499         }
 500         else // Standard session expiration (=when browser closes)
 501         {
 502             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 503             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 504             session_regenerate_id(true);
 505         }
 506
 507         // Optional redirect after login:
 508         if (isset($_GET['post'])) {
 509             $uri = '?post='. urlencode($_GET['post']);
 510             foreach (array('description', 'source', 'title') as $param) {
 511                 if (!empty($_GET[$param])) {
 512                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 513                 }
 514             }
 515             header('Location: '. $uri);
 516             exit;
 517         }
 518
 519         if (isset($_GET['edit_link'])) {
 520             header('Location: ?edit_link='. escape($_GET['edit_link']));
 521             exit;
 522         }
 523
 524         if (isset($_POST['returnurl'])) {
 525             // Prevent loops over login screen.
 526             if (strpos($_POST['returnurl'], 'do=login') === false) {
 527                 header('Location: '. escape($_POST['returnurl']));
 528                 exit;
 529             }
 530         }
 531         header('Location: ?'); exit;
 532     }
 533     else
 534     {
 535         ban_loginFailed();
 536         $redir = '';
 537         if (isset($_GET['post'])) {
 538             $redir = '?post=' . urlencode($_GET['post']);
 539             foreach (array('description', 'source', 'title') as $param) {
 540                 if (!empty($_GET[$param])) {
 541                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 542                 }
 543             }
 544         }
 545         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 546         exit;
 547     }
 548 }
 549
 550 // ------------------------------------------------------------------------------------------
 551 // Misc utility functions:
 552
 553 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 554 function return_bytes($val)
 555 {
 556     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 557     switch($last)
 558     {
 559         case 'g': $val *= 1024;
 560         case 'm': $val *= 1024;
 561         case 'k': $val *= 1024;
 562     }
 563     return $val;
 564 }
 565
 566 // Try to determine max file size for uploads (POST).
 567 // Returns an integer (in bytes)
 568 function getMaxFileSize()
 569 {
 570     $size1 = return_bytes(ini_get('post_max_size'));
 571     $size2 = return_bytes(ini_get('upload_max_filesize'));
 572     // Return the smaller of two:
 573     $maxsize = min($size1,$size2);
 574     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 575     return $maxsize;
 576 }
 577
 578 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 579     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 580     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 581 function linkdate2timestamp($linkdate)
 582 {
 583     if(strcmp($linkdate, '_000000') !== 0 || !$linkdate){
 584         $Y=$M=$D=$h=$m=$s=0;
 585         $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 586         return mktime($h,$m,$s,$M,$D,$Y);
 587     }
 588     return time();
 589 }
 590
 591 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 592     (used to build the pubDate attribute in RSS feed.)  */
 593 function linkdate2rfc822($linkdate)
 594 {
 595     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 596 }
 597
 598 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 599     (used to build the updated tags in ATOM feed.)  */
 600 function linkdate2iso8601($linkdate)
 601 {
 602     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 603 }
 604
 605 // Extract title from an HTML document.
 606 // (Returns an empty string if not found.)
 607 function html_extract_title($html)
 608 {
 609   return preg_match('!<title>(.*?)</title>!is', $html, $matches) ? trim(str_replace("\n",' ', $matches[1])) : '' ;
 610 }
 611
 612 // ------------------------------------------------------------------------------------------
 613 // Token management for XSRF protection
 614 // Token should be used in any form which acts on data (create,update,delete,import...).
 615 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 616
 617 // Returns a token.
 618 function getToken()
 619 {
 620     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 621     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 622     return $rnd;
 623 }
 624
 625 // Tells if a token is OK. Using this function will destroy the token.
 626 // true=token is OK.
 627 function tokenOk($token)
 628 {
 629     if (isset($_SESSION['tokens'][$token]))
 630     {
 631         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 632         return true; // Token is OK.
 633     }
 634     return false; // Wrong token, or already used.
 635 }
 636
 637 // ------------------------------------------------------------------------------------------
 638 /* This class is in charge of building the final page.
 639    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 640    p = new pageBuilder;
 641    p.assign('myfield','myvalue');
 642    p.renderPage('mytemplate');
 643
 644 */
 645 class pageBuilder
 646 {
 647     private $tpl; // RainTPL template
 648
 649     function __construct()
 650     {
 651         $this->tpl = false;
 652     }
 653
 654     /**
 655      * Initialize all default tpl tags.
 656      */
 657     private function initialize()
 658     {
 659         $this->tpl = new RainTPL;
 660         $this->tpl->assign('newversion', escape(checkUpdate()));
 661         $this->tpl->assign('feedurl', escape(index_url($_SERVER)));
 662         $searchcrits = ''; // Search criteria
 663         if (!empty($_GET['searchtags'])) {
 664             $searchcrits .= '&searchtags=' . urlencode($_GET['searchtags']);
 665         }
 666         elseif (!empty($_GET['searchterm'])) {
 667             $searchcrits .= '&searchterm=' . urlencode($_GET['searchterm']);
 668         }
 669         $this->tpl->assign('searchcrits', $searchcrits);
 670         $this->tpl->assign('source', index_url($_SERVER));
 671         $this->tpl->assign('version', shaarli_version);
 672         $this->tpl->assign('scripturl', index_url($_SERVER));
 673         $this->tpl->assign('pagetitle', 'Shaarli');
 674         $this->tpl->assign('privateonly', !empty($_SESSION['privateonly'])); // Show only private links?
 675         if (!empty($GLOBALS['title'])) {
 676             $this->tpl->assign('pagetitle', $GLOBALS['title']);
 677         }
 678         if (!empty($GLOBALS['titleLink'])) {
 679             $this->tpl->assign('titleLink', $GLOBALS['titleLink']);
 680         }
 681         if (!empty($GLOBALS['pagetitle'])) {
 682             $this->tpl->assign('pagetitle', $GLOBALS['pagetitle']);
 683         }
 684         $this->tpl->assign('shaarlititle', empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title']);
 685         if (!empty($GLOBALS['plugin_errors'])) {
 686             $this->tpl->assign('plugin_errors', $GLOBALS['plugin_errors']);
 687         }
 688     }
 689
 690     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 691     public function assign($what,$where)
 692     {
 693         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 694         $this->tpl->assign($what,$where);
 695     }
 696
 697     // Render a specific page (using a template).
 698     // e.g. pb.renderPage('picwall')
 699     public function renderPage($page)
 700     {
 701         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 702         $this->tpl->draw($page);
 703     }
 704 }
 705
 706 // ------------------------------------------------------------------------------------------
 707 // Output the last N links in RSS 2.0 format.
 708 function showRSS()
 709 {
 710     header('Content-Type: application/rss+xml; charset=utf-8');
 711
 712     // $usepermalink : If true, use permalink instead of final link.
 713     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=rss&permalinks
 714     // Also enabled through a config option
 715     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 716
 717     // Cache system
 718     $query = $_SERVER["QUERY_STRING"];
 719     $cache = new CachedPage(
 720         $GLOBALS['config']['PAGECACHE'],
 721         page_url($_SERVER),
 722         startsWith($query,'do=rss') && !isLoggedIn()
 723     );
 724     $cached = $cache->cachedVersion();
 725     if (! empty($cached)) {
 726         echo $cached;
 727         exit;
 728     }
 729
 730     // If cached was not found (or not usable), then read the database and build the response:
 731     $LINKSDB = new LinkDB(
 732         $GLOBALS['config']['DATASTORE'],
 733         isLoggedIn(),
 734         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 735         $GLOBALS['redirector']
 736     );
 737     // Read links from database (and filter private links if user it not logged in).
 738
 739     // Optionally filter the results:
 740     $linksToDisplay=array();
 741     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 742     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 743     else $linksToDisplay = $LINKSDB;
 744
 745     $nblinksToDisplay = 50;  // Number of links to display.
 746     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 747     {
 748         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 749     }
 750
 751     $pageaddr=escape(index_url($_SERVER));
 752     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 753     echo '<channel><title>'.$GLOBALS['title'].'</title><link>'.$pageaddr.'</link>';
 754     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 755     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 756     {
 757         echo '<!-- PubSubHubbub Discovery -->';
 758         echo '<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 759         echo '<link rel="self" href="'.$pageaddr.'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 760         echo '<!-- End Of PubSubHubbub Discovery -->';
 761     }
 762     $i=0;
 763     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 764     while ($i<$nblinksToDisplay && $i<count($keys))
 765     {
 766         $link = $linksToDisplay[$keys[$i]];
 767         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 768         $rfc822date = linkdate2rfc822($link['linkdate']);
 769         $absurl = $link['url'];
 770         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 771         if ($usepermalinks===true)
 772             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 773         else
 774             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 775         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.escape($rfc822date)."</pubDate>\n";
 776         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 777         {
 778             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.$pageaddr.'">'.$tag.'</category>'."\n"; }
 779         }
 780
 781         // Add permalink in description
 782         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 783         // If user wants permalinks first, put the final link in description
 784         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 785         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 786         echo '<description><![CDATA['.
 787             format_description($link['description'], $GLOBALS['redirector']) .
 788             $descriptionlink . ']]></description>' . "\n</item>\n";
 789         $i++;
 790     }
 791     echo '</channel></rss><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 792
 793     $cache->cache(ob_get_contents());
 794     ob_end_flush();
 795     exit;
 796 }
 797
 798 // ------------------------------------------------------------------------------------------
 799 // Output the last N links in ATOM format.
 800 function showATOM()
 801 {
 802     header('Content-Type: application/atom+xml; charset=utf-8');
 803
 804     // $usepermalink : If true, use permalink instead of final link.
 805     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
 806     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 807
 808     // Cache system
 809     $query = $_SERVER["QUERY_STRING"];
 810     $cache = new CachedPage(
 811         $GLOBALS['config']['PAGECACHE'],
 812         page_url($_SERVER),
 813         startsWith($query,'do=atom') && !isLoggedIn()
 814     );
 815     $cached = $cache->cachedVersion();
 816     if (!empty($cached)) {
 817         echo $cached;
 818         exit;
 819     }
 820
 821     // If cached was not found (or not usable), then read the database and build the response:
 822     // Read links from database (and filter private links if used it not logged in).
 823     $LINKSDB = new LinkDB(
 824         $GLOBALS['config']['DATASTORE'],
 825         isLoggedIn(),
 826         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 827         $GLOBALS['redirector']
 828     );
 829
 830     // Optionally filter the results:
 831     $linksToDisplay=array();
 832     if (!empty($_GET['searchterm'])) $linksToDisplay = $LINKSDB->filterFulltext($_GET['searchterm']);
 833     else if (!empty($_GET['searchtags']))   $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
 834     else $linksToDisplay = $LINKSDB;
 835
 836     $nblinksToDisplay = 50;  // Number of links to display.
 837     if (!empty($_GET['nb']))  // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 838     {
 839         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max($_GET['nb']+0,1) ;
 840     }
 841
 842     $pageaddr=escape(index_url($_SERVER));
 843     $latestDate = '';
 844     $entries='';
 845     $i=0;
 846     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 847     while ($i<$nblinksToDisplay && $i<count($keys))
 848     {
 849         $link = $linksToDisplay[$keys[$i]];
 850         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 851         $iso8601date = linkdate2iso8601($link['linkdate']);
 852         $latestDate = max($latestDate,$iso8601date);
 853         $absurl = $link['url'];
 854         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 855         $entries.='<entry><title>'.$link['title'].'</title>';
 856         if ($usepermalinks===true)
 857             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
 858         else
 859             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
 860         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.escape($iso8601date).'</updated>';
 861
 862         // Add permalink in description
 863         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 864         // If user wants permalinks first, put the final link in description
 865         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 866         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 867
 868         $entries .= '<content type="html"><![CDATA['.
 869             format_description($link['description'], $GLOBALS['redirector']) .
 870             $descriptionlink . "]]></content>\n";
 871         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
 872         {
 873             foreach(explode(' ',$link['tags']) as $tag)
 874                 { $entries.='<category scheme="'.$pageaddr.'" term="'.$tag.'" />'."\n"; }
 875         }
 876         $entries.="</entry>\n";
 877         $i++;
 878     }
 879     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
 880     $feed.='<title>'.$GLOBALS['title'].'</title>';
 881     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.escape($latestDate).'</updated>';
 882     $feed.='<link rel="self" href="'.escape(server_url($_SERVER).$_SERVER["REQUEST_URI"]).'" />';
 883     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 884     {
 885         $feed.='<!-- PubSubHubbub Discovery -->';
 886         $feed.='<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
 887         $feed.='<!-- End Of PubSubHubbub Discovery -->';
 888     }
 889     $feed.='<author><name>'.$pageaddr.'</name><uri>'.$pageaddr.'</uri></author>';
 890     $feed.='<id>'.$pageaddr.'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
 891     $feed.=$entries;
 892     $feed.='</feed><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 893     echo $feed;
 894
 895     $cache->cache(ob_get_contents());
 896     ob_end_flush();
 897     exit;
 898 }
 899
 900 // ------------------------------------------------------------------------------------------
 901 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 902 // Gives the last 7 days (which have links).
 903 // This RSS feed cannot be filtered.
 904 function showDailyRSS() {
 905     // Cache system
 906     $query = $_SERVER["QUERY_STRING"];
 907     $cache = new CachedPage(
 908         $GLOBALS['config']['PAGECACHE'],
 909         page_url($_SERVER),
 910         startsWith($query,'do=dailyrss') && !isLoggedIn()
 911     );
 912     $cached = $cache->cachedVersion();
 913     if (!empty($cached)) {
 914         echo $cached;
 915         exit;
 916     }
 917
 918     // If cached was not found (or not usable), then read the database and build the response:
 919     // Read links from database (and filter private links if used it not logged in).
 920     $LINKSDB = new LinkDB(
 921         $GLOBALS['config']['DATASTORE'],
 922         isLoggedIn(),
 923         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 924         $GLOBALS['redirector']
 925     );
 926
 927     /* Some Shaarlies may have very few links, so we need to look
 928        back in time (rsort()) until we have enough days ($nb_of_days).
 929     */
 930     $linkdates = array();
 931     foreach ($LINKSDB as $linkdate => $value) {
 932         $linkdates[] = $linkdate;
 933     }
 934     rsort($linkdates);
 935     $nb_of_days = 7; // We take 7 days.
 936     $today = Date('Ymd');
 937     $days = array();
 938
 939     foreach ($linkdates as $linkdate) {
 940         $day = substr($linkdate, 0, 8); // Extract day (without time)
 941         if (strcmp($day,$today) < 0) {
 942             if (empty($days[$day])) {
 943                 $days[$day] = array();
 944             }
 945             $days[$day][] = $linkdate;
 946         }
 947
 948         if (count($days) > $nb_of_days) {
 949             break; // Have we collected enough days?
 950         }
 951     }
 952
 953     // Build the RSS feed.
 954     header('Content-Type: application/rss+xml; charset=utf-8');
 955     $pageaddr = escape(index_url($_SERVER));
 956     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 957     echo '<channel>';
 958     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 959     echo '<link>'. $pageaddr .'</link>';
 960     echo '<description>Daily shared links</description>';
 961     echo '<language>en-en</language>';
 962     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 963
 964     // For each day.
 965     foreach ($days as $day => $linkdates) {
 966         $daydate = linkdate2timestamp($day.'_000000'); // Full text date
 967         $rfc822date = linkdate2rfc822($day.'_000000');
 968         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 969
 970         // Build the HTML body of this RSS entry.
 971         $html = '';
 972         $href = '';
 973         $links = array();
 974
 975         // We pre-format some fields for proper output.
 976         foreach ($linkdates as $linkdate) {
 977             $l = $LINKSDB[$linkdate];
 978             $l['formatedDescription'] = format_description($l['description'], $GLOBALS['redirector']);
 979             $l['thumbnail'] = thumbnail($l['url']);
 980             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
 981             if (startsWith($l['url'], '?')) {
 982                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 983             }
 984             $links[$linkdate] = $l;
 985         }
 986
 987         // Then build the HTML for this day:
 988         $tpl = new RainTPL;
 989         $tpl->assign('title', $GLOBALS['title']);
 990         $tpl->assign('daydate', $daydate);
 991         $tpl->assign('absurl', $absurl);
 992         $tpl->assign('links', $links);
 993         $tpl->assign('rfc822date', escape($rfc822date));
 994         $html = $tpl->draw('dailyrss', $return_string=true);
 995
 996         echo $html . PHP_EOL;
 997     }
 998     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
 999
1000     $cache->cache(ob_get_contents());
1001     ob_end_flush();
1002     exit;
1003 }
1004
1005 // "Daily" page.
1006 function showDaily()
1007 {
1008     $LINKSDB = new LinkDB(
1009         $GLOBALS['config']['DATASTORE'],
1010         isLoggedIn(),
1011         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1012         $GLOBALS['redirector']
1013     );
1014
1015     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
1016     if (isset($_GET['day'])) $day=$_GET['day'];
1017
1018     $days = $LINKSDB->days();
1019     $i = array_search($day,$days);
1020     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
1021     $previousday='';
1022     $nextday='';
1023     if ($i!==false)
1024     {
1025         if ($i>=1) $previousday=$days[$i-1];
1026         if ($i<count($days)-1) $nextday=$days[$i+1];
1027     }
1028
1029     try {
1030         $linksToDisplay = $LINKSDB->filterDay($day);
1031     } catch (Exception $exc) {
1032         error_log($exc);
1033         $linksToDisplay = array();
1034     }
1035
1036     // We pre-format some fields for proper output.
1037     foreach($linksToDisplay as $key=>$link)
1038     {
1039
1040         $taglist = explode(' ',$link['tags']);
1041         uasort($taglist, 'strcasecmp');
1042         $linksToDisplay[$key]['taglist']=$taglist;
1043         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $GLOBALS['redirector']);
1044         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
1045         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
1046     }
1047
1048     /* We need to spread the articles on 3 columns.
1049        I did not want to use a JavaScript lib like http://masonry.desandro.com/
1050        so I manually spread entries with a simple method: I roughly evaluate the
1051        height of a div according to title and description length.
1052     */
1053     $columns=array(array(),array(),array()); // Entries to display, for each column.
1054     $fill=array(0,0,0);  // Rough estimate of columns fill.
1055     foreach($linksToDisplay as $key=>$link)
1056     {
1057         // Roughly estimate length of entry (by counting characters)
1058         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
1059         // Description: 836 characters gives roughly 342 pixel height.
1060         // This is not perfect, but it's usually OK.
1061         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
1062         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
1063         // Then put in column which is the less filled:
1064         $smallest=min($fill); // find smallest value in array.
1065         $index=array_search($smallest,$fill); // find index of this smallest value.
1066         array_push($columns[$index],$link); // Put entry in this column.
1067         $fill[$index]+=$length;
1068     }
1069     $PAGE = new pageBuilder;
1070     $data = array(
1071         'linksToDisplay' => $linksToDisplay,
1072         'linkcount' => count($LINKSDB),
1073         'cols' => $columns,
1074         'day' => linkdate2timestamp($day.'_000000'),
1075         'previousday' => $previousday,
1076         'nextday' => $nextday,
1077     );
1078     $pluginManager = PluginManager::getInstance();
1079     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
1080
1081     foreach ($data as $key => $value) {
1082         $PAGE->assign($key, $value);
1083     }
1084
1085     $PAGE->renderPage('daily');
1086     exit;
1087 }
1088
1089 // Renders the linklist
1090 function showLinkList($PAGE, $LINKSDB) {
1091     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1092     $PAGE->renderPage('linklist');
1093 }
1094
1095
1096 // ------------------------------------------------------------------------------------------
1097 // Render HTML page (according to URL parameters and user rights)
1098 function renderPage()
1099 {
1100     $LINKSDB = new LinkDB(
1101         $GLOBALS['config']['DATASTORE'],
1102         isLoggedIn(),
1103         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1104         $GLOBALS['redirector']
1105     );
1106
1107     $PAGE = new pageBuilder;
1108
1109     // Determine which page will be rendered.
1110     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
1111     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
1112
1113     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
1114     // Then assign generated data to RainTPL.
1115     $common_hooks = array(
1116         'header',
1117         'footer',
1118         'includes',
1119     );
1120     $pluginManager = PluginManager::getInstance();
1121     foreach($common_hooks as $name) {
1122         $plugin_data = array();
1123         $pluginManager->executeHooks('render_' . $name, $plugin_data,
1124             array(
1125                 'target' => $targetPage,
1126                 'loggedin' => isLoggedIn()
1127             )
1128         );
1129         $PAGE->assign('plugins_' . $name, $plugin_data);
1130     }
1131
1132     // -------- Display login form.
1133     if ($targetPage == Router::$PAGE_LOGIN)
1134     {
1135         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1136         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1137         $PAGE->assign('token',$token);
1138         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
1139         $PAGE->renderPage('loginform');
1140         exit;
1141     }
1142     // -------- User wants to logout.
1143     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1144     {
1145         invalidateCaches($GLOBALS['config']['PAGECACHE']);
1146         logout();
1147         header('Location: ?');
1148         exit;
1149     }
1150
1151     // -------- Picture wall
1152     if ($targetPage == Router::$PAGE_PICWALL)
1153     {
1154         // Optionally filter the results:
1155         $links=array();
1156         if (!empty($_GET['searchterm'])) $links = $LINKSDB->filterFulltext($_GET['searchterm']);
1157         elseif (!empty($_GET['searchtags']))   $links = $LINKSDB->filterTags(trim($_GET['searchtags']));
1158         else $links = $LINKSDB;
1159
1160         $body='';
1161         $linksToDisplay=array();
1162
1163         // Get only links which have a thumbnail.
1164         foreach($links as $link)
1165         {
1166             $permalink='?'.escape(smallhash($link['linkdate']));
1167             $thumb=lazyThumbnail($link['url'],$permalink);
1168             if ($thumb!='') // Only output links which have a thumbnail.
1169             {
1170                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1171                 $linksToDisplay[]=$link; // Add to array.
1172             }
1173         }
1174
1175         $data = array(
1176             'linkcount' => count($LINKSDB),
1177             'linksToDisplay' => $linksToDisplay,
1178         );
1179         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
1180
1181         foreach ($data as $key => $value) {
1182             $PAGE->assign($key, $value);
1183         }
1184
1185         $PAGE->renderPage('picwall');
1186         exit;
1187     }
1188
1189     // -------- Tag cloud
1190     if ($targetPage == Router::$PAGE_TAGCLOUD)
1191     {
1192         $tags= $LINKSDB->allTags();
1193
1194         // We sort tags alphabetically, then choose a font size according to count.
1195         // First, find max value.
1196         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1197         ksort($tags);
1198         $tagList=array();
1199         foreach($tags as $key=>$value)
1200         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1201         {
1202             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1203         }
1204
1205         $data = array(
1206             'linkcount' => count($LINKSDB),
1207             'tags' => $tagList,
1208         );
1209         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
1210
1211         foreach ($data as $key => $value) {
1212             $PAGE->assign($key, $value);
1213         }
1214
1215         $PAGE->renderPage('tagcloud');
1216         exit;
1217     }
1218
1219     // Display openseach plugin (XML)
1220     if ($targetPage == Router::$PAGE_OPENSEARCH) {
1221         header('Content-Type: application/xml; charset=utf-8');
1222         $PAGE->assign('serverurl', index_url($_SERVER));
1223         $PAGE->renderPage('opensearch');
1224         exit;
1225     }
1226
1227     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1228     if (isset($_GET['addtag']))
1229     {
1230         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1231         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1232         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1233
1234         // Prevent redirection loop
1235         if (isset($params['addtag'])) {
1236             unset($params['addtag']);
1237         }
1238
1239         // Check if this tag is already in the search query and ignore it if it is.
1240         // Each tag is always separated by a space
1241         if (isset($params['searchtags'])) {
1242             $current_tags = explode(' ', $params['searchtags']);
1243         } else {
1244             $current_tags = array();
1245         }
1246         $addtag = true;
1247         foreach ($current_tags as $value) {
1248             if ($value === $_GET['addtag']) {
1249                 $addtag = false;
1250                 break;
1251             }
1252         }
1253         // Append the tag if necessary
1254         if (empty($params['searchtags'])) {
1255             $params['searchtags'] = trim($_GET['addtag']);
1256         }
1257         else if ($addtag) {
1258             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1259         }
1260
1261         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1262         header('Location: ?'.http_build_query($params));
1263         exit;
1264     }
1265
1266     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1267     if (isset($_GET['removetag'])) {
1268         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1269         if (empty($_SERVER['HTTP_REFERER'])) {
1270             header('Location: ?');
1271             exit;
1272         }
1273
1274         // In case browser does not send HTTP_REFERER
1275         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1276
1277         // Prevent redirection loop
1278         if (isset($params['removetag'])) {
1279             unset($params['removetag']);
1280         }
1281
1282         if (isset($params['searchtags'])) {
1283             $tags = explode(' ',$params['searchtags']);
1284             $tags=array_diff($tags, array($_GET['removetag'])); // Remove value from array $tags.
1285             if (count($tags)==0) {
1286                 unset($params['searchtags']);
1287             } else {
1288                 $params['searchtags'] = implode(' ',$tags);
1289             }
1290             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1291         }
1292         header('Location: ?'.http_build_query($params));
1293         exit;
1294     }
1295
1296     // -------- User wants to change the number of links per page (linksperpage=...)
1297     if (isset($_GET['linksperpage'])) {
1298         if (is_numeric($_GET['linksperpage'])) {
1299             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1300         }
1301
1302         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1303         exit;
1304     }
1305
1306     // -------- User wants to see only private links (toggle)
1307     if (isset($_GET['privateonly'])) {
1308         if (empty($_SESSION['privateonly'])) {
1309             $_SESSION['privateonly'] = 1; // See only private links
1310         } else {
1311             unset($_SESSION['privateonly']); // See all links
1312         }
1313
1314         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1315         exit;
1316     }
1317
1318     // -------- Handle other actions allowed for non-logged in users:
1319     if (!isLoggedIn())
1320     {
1321         // User tries to post new link but is not logged in:
1322         // Show login screen, then redirect to ?post=...
1323         if (isset($_GET['post']))
1324         {
1325             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1326             exit;
1327         }
1328
1329                 // Same case as above except that user tried to access ?do=addlink without being logged in
1330                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1331                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1332                         header('Location: ?do=login&post=');
1333                         exit;
1334                 }
1335         showLinkList($PAGE, $LINKSDB);
1336         if (isset($_GET['edit_link'])) {
1337             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1338             exit;
1339         }
1340
1341         exit; // Never remove this one! All operations below are reserved for logged in user.
1342     }
1343
1344     // -------- All other functions are reserved for the registered user:
1345
1346     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1347     if ($targetPage == Router::$PAGE_TOOLS)
1348     {
1349         $data = array(
1350             'linkcount' => count($LINKSDB),
1351             'pageabsaddr' => index_url($_SERVER),
1352         );
1353         $pluginManager->executeHooks('render_tools', $data);
1354
1355         foreach ($data as $key => $value) {
1356             $PAGE->assign($key, $value);
1357         }
1358
1359         $PAGE->renderPage('tools');
1360         exit;
1361     }
1362
1363     // -------- User wants to change his/her password.
1364     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1365     {
1366         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1367         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1368         {
1369             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1370
1371             // Make sure old password is correct.
1372             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1373             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1374             // Save new password
1375             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1376             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1377             try {
1378                 writeConfig($GLOBALS, isLoggedIn());
1379             }
1380             catch(Exception $e) {
1381                 error_log(
1382                     'ERROR while writing config file after changing password.' . PHP_EOL .
1383                     $e->getMessage()
1384                 );
1385
1386                 // TODO: do not handle exceptions/errors in JS.
1387                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1388                 exit;
1389             }
1390             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1391             exit;
1392         }
1393         else // show the change password form.
1394         {
1395             $PAGE->assign('linkcount',count($LINKSDB));
1396             $PAGE->assign('token',getToken());
1397             $PAGE->renderPage('changepassword');
1398             exit;
1399         }
1400     }
1401
1402     // -------- User wants to change configuration
1403     if ($targetPage == Router::$PAGE_CONFIGURE)
1404     {
1405         if (!empty($_POST['title']) )
1406         {
1407             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1408             $tz = 'UTC';
1409             if (!empty($_POST['continent']) && !empty($_POST['city']))
1410                 if (isTimeZoneValid($_POST['continent'],$_POST['city']))
1411                     $tz = $_POST['continent'].'/'.$_POST['city'];
1412             $GLOBALS['timezone'] = $tz;
1413             $GLOBALS['title']=$_POST['title'];
1414             $GLOBALS['titleLink']=$_POST['titleLink'];
1415             $GLOBALS['redirector']=$_POST['redirector'];
1416             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1417             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1418             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1419             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1420             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1421             try {
1422                 writeConfig($GLOBALS, isLoggedIn());
1423             }
1424             catch(Exception $e) {
1425                 error_log(
1426                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1427                     $e->getMessage()
1428                 );
1429
1430                 // TODO: do not handle exceptions/errors in JS.
1431                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1432                 exit;
1433             }
1434             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1435             exit;
1436         }
1437         else // Show the configuration form.
1438         {
1439             $PAGE->assign('linkcount',count($LINKSDB));
1440             $PAGE->assign('token',getToken());
1441             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1442             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1443             list($timezone_form, $timezone_js) = generateTimeZoneForm($GLOBALS['timezone']);
1444             $PAGE->assign('timezone_form', $timezone_form);
1445             $PAGE->assign('timezone_js',$timezone_js);
1446             $PAGE->renderPage('configure');
1447             exit;
1448         }
1449     }
1450
1451     // -------- User wants to rename a tag or delete it
1452     if ($targetPage == Router::$PAGE_CHANGETAG)
1453     {
1454         if (empty($_POST['fromtag']))
1455         {
1456             $PAGE->assign('linkcount',count($LINKSDB));
1457             $PAGE->assign('token',getToken());
1458             $PAGE->assign('tags', $LINKSDB->allTags());
1459             $PAGE->renderPage('changetag');
1460             exit;
1461         }
1462         if (!tokenOk($_POST['token'])) die('Wrong token.');
1463
1464         // Delete a tag:
1465         if (!empty($_POST['deletetag']) && !empty($_POST['fromtag']))
1466         {
1467             $needle=trim($_POST['fromtag']);
1468             $linksToAlter = $LINKSDB->filterTags($needle,true); // True for case-sensitive tag search.
1469             foreach($linksToAlter as $key=>$value)
1470             {
1471                 $tags = explode(' ',trim($value['tags']));
1472                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1473                 $value['tags']=trim(implode(' ',$tags));
1474                 $LINKSDB[$key]=$value;
1475             }
1476             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1477             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1478             exit;
1479         }
1480
1481         // Rename a tag:
1482         if (!empty($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag']))
1483         {
1484             $needle=trim($_POST['fromtag']);
1485             $linksToAlter = $LINKSDB->filterTags($needle,true); // true for case-sensitive tag search.
1486             foreach($linksToAlter as $key=>$value)
1487             {
1488                 $tags = explode(' ',trim($value['tags']));
1489                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1490                 $value['tags']=trim(implode(' ',$tags));
1491                 $LINKSDB[$key]=$value;
1492             }
1493             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1494             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1495             exit;
1496         }
1497     }
1498
1499     // -------- User wants to add a link without using the bookmarklet: Show form.
1500     if ($targetPage == Router::$PAGE_ADDLINK)
1501     {
1502         $PAGE->assign('linkcount',count($LINKSDB));
1503         $PAGE->renderPage('addlink');
1504         exit;
1505     }
1506
1507     // -------- User clicked the "Save" button when editing a link: Save link to database.
1508     if (isset($_POST['save_edit']))
1509     {
1510         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1511         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1512         $tags = implode(' ', array_unique(explode(' ', $tags))); // Remove duplicates.
1513         $linkdate=$_POST['lf_linkdate'];
1514         $url = trim($_POST['lf_url']);
1515         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?') && !startsWith($url,'javascript:'))
1516             $url = 'http://'.$url;
1517         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1518                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1519         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1520
1521         $pluginManager->executeHooks('save_link', $link);
1522
1523         $LINKSDB[$linkdate] = $link;
1524         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1525         pubsubhub();
1526
1527         // If we are called from the bookmarklet, we must close the popup:
1528         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1529             echo '<script>self.close();</script>';
1530             exit;
1531         }
1532
1533         $returnurl = !empty($_POST['returnurl']) ? escape($_POST['returnurl']): '?';
1534         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1535         $location .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1536         header('Location: '. $location); // After saving the link, redirect to the page the user was on.
1537         exit;
1538     }
1539
1540     // -------- User clicked the "Cancel" button when editing a link.
1541     if (isset($_POST['cancel_edit']))
1542     {
1543         // If we are called from the bookmarklet, we must close the popup:
1544         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1545         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1546         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1547         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1548         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1549         exit;
1550     }
1551
1552     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1553     if (isset($_POST['delete_link']))
1554     {
1555         if (!tokenOk($_POST['token'])) die('Wrong token.');
1556         // We do not need to ask for confirmation:
1557         // - confirmation is handled by JavaScript
1558         // - we are protected from XSRF by the token.
1559         $linkdate=$_POST['lf_linkdate'];
1560
1561         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1562
1563         unset($LINKSDB[$linkdate]);
1564         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // save to disk
1565
1566         // If we are called from the bookmarklet, we must close the popup:
1567         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1568         // Pick where we're going to redirect
1569         // =============================================================
1570         // Basically, we can't redirect to where we were previously if it was a permalink
1571         // or an edit_link, because it would 404.
1572         // Cases:
1573         //    - /             : nothing in $_GET, redirect to self
1574         //    - /?page        : redirect to self
1575         //    - /?searchterm  : redirect to self (there might be other links)
1576         //    - /?searchtags  : redirect to self
1577         //    - /permalink    : redirect to / (the link does not exist anymore)
1578         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1579         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1580         // redirect is not satisfied, and only then redirect to /
1581         $location = "?";
1582         // Self redirection
1583         if (count($_GET) == 0
1584             || isset($_GET['page'])
1585             || isset($_GET['searchterm'])
1586             || isset($_GET['searchtags'])
1587         ) {
1588             if (isset($_POST['returnurl'])) {
1589                 $location = $_POST['returnurl']; // Handle redirects given by the form
1590             } else {
1591                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1592             }
1593         }
1594
1595         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1596         exit;
1597     }
1598
1599     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1600     if (isset($_GET['edit_link']))
1601     {
1602         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1603         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1604         $data = array(
1605             'linkcount' => count($LINKSDB),
1606             'link' => $link,
1607             'link_is_new' => false,
1608             'token' => getToken(),
1609             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1610             'tags' => $LINKSDB->allTags(),
1611         );
1612         $pluginManager->executeHooks('render_editlink', $data);
1613
1614         foreach ($data as $key => $value) {
1615             $PAGE->assign($key, $value);
1616         }
1617
1618         $PAGE->renderPage('editlink');
1619         exit;
1620     }
1621
1622     // -------- User want to post a new link: Display link edit form.
1623     if (isset($_GET['post'])) {
1624         $url = cleanup_url($_GET['post']);
1625
1626         $link_is_new = false;
1627         // Check if URL is not already in database (in this case, we will edit the existing link)
1628         $link = $LINKSDB->getLinkFromUrl($url);
1629         if (!$link)
1630         {
1631             $link_is_new = true;
1632             $linkdate = strval(date('Ymd_His'));
1633             // Get title if it was provided in URL (by the bookmarklet).
1634             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1635             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1636             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1637             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1638             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1639             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1640             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1641                 // Short timeout to keep the application responsive
1642                 list($headers, $data) = get_http_url($url, 4);
1643                 // FIXME: Decode charset according to specified in either 1) HTTP response headers or 2) <head> in html
1644                 if (strpos($headers[0], '200 OK') !== false) {
1645                     // Look for charset in html header.
1646                     preg_match('#<meta .*charset=.*>#Usi', $data, $meta);
1647
1648                     // If found, extract encoding.
1649                     if (!empty($meta[0])) {
1650                         // Get encoding specified in header.
1651                         preg_match('#charset="?(.*)"#si', $meta[0], $enc);
1652                         // If charset not found, use utf-8.
1653                         $html_charset = (!empty($enc[1])) ? strtolower($enc[1]) : 'utf-8';
1654                     }
1655                     else {
1656                         $html_charset = 'utf-8';
1657                     }
1658
1659                     // Extract title
1660                     $title = html_extract_title($data);
1661                     if (!empty($title)) {
1662                         // Re-encode title in utf-8 if necessary.
1663                         $title = ($html_charset == 'iso-8859-1') ? utf8_encode($title) : $title;
1664                     }
1665                 }
1666             }
1667             if ($url == '') {
1668                 $url = '?' . smallHash($linkdate);
1669                 $title = 'Note: ';
1670             }
1671             $link = array(
1672                 'linkdate' => $linkdate,
1673                 'title' => $title,
1674                 'url' => $url,
1675                 'description' => $description,
1676                 'tags' => $tags,
1677                 'private' => $private
1678             );
1679         }
1680
1681         $data = array(
1682             'linkcount' => count($LINKSDB),
1683             'link' => $link,
1684             'link_is_new' => $link_is_new,
1685             'token' => getToken(), // XSRF protection.
1686             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1687             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1688             'tags' => $LINKSDB->allTags(),
1689         );
1690         $pluginManager->executeHooks('render_editlink', $data);
1691
1692         foreach ($data as $key => $value) {
1693             $PAGE->assign($key, $value);
1694         }
1695
1696         $PAGE->renderPage('editlink');
1697         exit;
1698     }
1699
1700     // -------- Export as Netscape Bookmarks HTML file.
1701     if ($targetPage == Router::$PAGE_EXPORT)
1702     {
1703         if (empty($_GET['what']))
1704         {
1705             $PAGE->assign('linkcount',count($LINKSDB));
1706             $PAGE->renderPage('export');
1707             exit;
1708         }
1709         $exportWhat=$_GET['what'];
1710         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1711
1712         header('Content-Type: text/html; charset=utf-8');
1713         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1714         $currentdate=date('Y/m/d H:i:s');
1715         echo <<<HTML
1716 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1717 <!-- This is an automatically generated file.
1718      It will be read and overwritten.
1719      DO NOT EDIT! -->
1720 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1721 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1722 <TITLE>Bookmarks</TITLE>
1723 <H1>Bookmarks</H1>
1724 HTML;
1725         foreach($LINKSDB as $link)
1726         {
1727             if ($exportWhat=='all' ||
1728                ($exportWhat=='private' && $link['private']!=0) ||
1729                ($exportWhat=='public' && $link['private']==0))
1730             {
1731                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1732                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1733                 echo '>'.$link['title']."</A>\n";
1734                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1735             }
1736         }
1737                 exit;
1738     }
1739
1740     // -------- User is uploading a file for import
1741     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1742     {
1743         // If file is too big, some form field may be missing.
1744         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1745         {
1746             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1747             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1748             exit;
1749         }
1750         if (!tokenOk($_POST['token'])) die('Wrong token.');
1751         importFile();
1752         exit;
1753     }
1754
1755     // -------- Show upload/import dialog:
1756     if ($targetPage == Router::$PAGE_IMPORT)
1757     {
1758         $PAGE->assign('linkcount',count($LINKSDB));
1759         $PAGE->assign('token',getToken());
1760         $PAGE->assign('maxfilesize',getMaxFileSize());
1761         $PAGE->renderPage('import');
1762         exit;
1763     }
1764
1765     // -------- Otherwise, simply display search form and links:
1766     showLinkList($PAGE, $LINKSDB);
1767     exit;
1768 }
1769
1770 // -----------------------------------------------------------------------------------------------
1771 // Process the import file form.
1772 function importFile()
1773 {
1774     if (!isLoggedIn()) { die('Not allowed.'); }
1775     $LINKSDB = new LinkDB(
1776         $GLOBALS['config']['DATASTORE'],
1777         isLoggedIn(),
1778         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1779         $GLOBALS['redirector']
1780     );
1781     $filename=$_FILES['filetoupload']['name'];
1782     $filesize=$_FILES['filetoupload']['size'];
1783     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1784     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1785     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1786     $import_count=0;
1787
1788     // Sniff file type:
1789     $type='unknown';
1790     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1791
1792     // Then import the bookmarks.
1793     if ($type=='netscape')
1794     {
1795         // This is a standard Netscape-style bookmark file.
1796         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1797         foreach(explode('<DT>',$data) as $html) // explode is very fast
1798         {
1799             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1800             $d = explode('<DD>',$html);
1801             if (startswith($d[0],'<A '))
1802             {
1803                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1804                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1805                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1806                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1807                 $raw_add_date=0;
1808                 foreach($matches as $m)
1809                 {
1810                     $attr=$m[1]; $value=$m[2];
1811                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1812                     elseif ($attr=='ADD_DATE')
1813                     {
1814                         $raw_add_date=intval($value);
1815                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1816                     }
1817                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1818                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1819                 }
1820                 if ($link['url']!='')
1821                 {
1822                     if ($private==1) $link['private']=1;
1823                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1824                     if ($dblink==false)
1825                     {  // Link not in database, let's import it...
1826                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1827
1828                        // Make sure date/time is not already used by another link.
1829                        // (Some bookmark files have several different links with the same ADD_DATE)
1830                        // We increment date by 1 second until we find a date which is not used in DB.
1831                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1832                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1833                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1834                        $LINKSDB[$link['linkdate']] = $link;
1835                        $import_count++;
1836                     }
1837                     else // Link already present in database.
1838                     {
1839                         if ($overwrite)
1840                         {   // If overwrite is required, we import link data, except date/time.
1841                             $link['linkdate']=$dblink['linkdate'];
1842                             $LINKSDB[$link['linkdate']] = $link;
1843                             $import_count++;
1844                         }
1845                     }
1846
1847                 }
1848             }
1849         }
1850         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1851
1852         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1853     }
1854     else
1855     {
1856         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1857     }
1858 }
1859
1860 // -----------------------------------------------------------------------------------------------
1861 // Template for the list of links (<div id="linklist">)
1862 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1863 function buildLinkList($PAGE,$LINKSDB)
1864 {
1865     // ---- Filter link database according to parameters
1866     $linksToDisplay=array();
1867     $search_type='';
1868     $search_crits='';
1869     if (isset($_GET['searchterm'])) // Fulltext search
1870     {
1871         $linksToDisplay = $LINKSDB->filterFulltext(trim($_GET['searchterm']));
1872         $search_crits=escape(trim($_GET['searchterm']));
1873         $search_type='fulltext';
1874     }
1875     elseif (isset($_GET['searchtags'])) // Search by tag
1876     {
1877         $linksToDisplay = $LINKSDB->filterTags(trim($_GET['searchtags']));
1878         $search_crits=explode(' ',escape(trim($_GET['searchtags'])));
1879         $search_type='tags';
1880     }
1881     elseif (isset($_SERVER['QUERY_STRING']) && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/',$_SERVER['QUERY_STRING'])) // Detect smallHashes in URL
1882     {
1883         $linksToDisplay = $LINKSDB->filterSmallHash(substr(trim($_SERVER["QUERY_STRING"], '/'),0,6));
1884         if (count($linksToDisplay)==0)
1885         {
1886             header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
1887             echo '<h1>404 Not found.</h1>Oh crap. The link you are trying to reach does not exist or has been deleted.';
1888             echo '<br>Would you mind <a href="?">clicking here</a>?';
1889             exit;
1890         }
1891         $search_type='permalink';
1892     }
1893     else
1894         $linksToDisplay = $LINKSDB;  // Otherwise, display without filtering.
1895
1896
1897     // Option: Show only private links
1898     if (!empty($_SESSION['privateonly']))
1899     {
1900         $tmp = array();
1901         foreach($linksToDisplay as $linkdate=>$link)
1902         {
1903             if ($link['private']!=0) $tmp[$linkdate]=$link;
1904         }
1905         $linksToDisplay=$tmp;
1906     }
1907
1908     // ---- Handle paging.
1909     /* Can someone explain to me why you get the following error when using array_keys() on an object which implements the interface ArrayAccess???
1910        "Warning: array_keys() expects parameter 1 to be array, object given in ... "
1911        If my class implements ArrayAccess, why won't array_keys() accept it ?  ( $keys=array_keys($linksToDisplay); )
1912     */
1913     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; } // Stupid and ugly. Thanks PHP.
1914
1915     // If there is only a single link, we change on-the-fly the title of the page.
1916     if (count($linksToDisplay)==1) $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1917
1918     // Select articles according to paging.
1919     $pagecount = ceil(count($keys)/$_SESSION['LINKS_PER_PAGE']);
1920     $pagecount = ($pagecount==0 ? 1 : $pagecount);
1921     $page=( empty($_GET['page']) ? 1 : intval($_GET['page']));
1922     $page = ( $page<1 ? 1 : $page );
1923     $page = ( $page>$pagecount ? $pagecount : $page );
1924     $i = ($page-1)*$_SESSION['LINKS_PER_PAGE']; // Start index.
1925     $end = $i+$_SESSION['LINKS_PER_PAGE'];
1926     $linkDisp=array(); // Links to display
1927     while ($i<$end && $i<count($keys))
1928     {
1929         $link = $linksToDisplay[$keys[$i]];
1930         $link['description'] = format_description($link['description'], $GLOBALS['redirector']);
1931         $classLi =  $i%2!=0 ? '' : 'publicLinkHightLight';
1932         $link['class'] = ($link['private']==0 ? $classLi : 'private');
1933         $link['timestamp']=linkdate2timestamp($link['linkdate']);
1934         $taglist = explode(' ',$link['tags']);
1935         uasort($taglist, 'strcasecmp');
1936         $link['taglist']=$taglist;
1937         $link['shorturl'] = smallHash($link['linkdate']);
1938         if ($link["url"][0] === '?' && // Check for both signs of a note: starting with ? and 7 chars long. I doubt that you'll post any links that look like this.
1939             strlen($link["url"]) === 7) {
1940             $link["url"] = index_url($_SERVER) . $link["url"];
1941         }
1942
1943         $linkDisp[$keys[$i]] = $link;
1944         $i++;
1945     }
1946
1947     // Compute paging navigation
1948     $searchterm= ( empty($_GET['searchterm']) ? '' : '&searchterm='.$_GET['searchterm'] );
1949     $searchtags= ( empty($_GET['searchtags']) ? '' : '&searchtags='.$_GET['searchtags'] );
1950     $paging='';
1951     $previous_page_url=''; if ($i!=count($keys)) $previous_page_url='?page='.($page+1).$searchterm.$searchtags;
1952     $next_page_url='';if ($page>1) $next_page_url='?page='.($page-1).$searchterm.$searchtags;
1953
1954     $token = ''; if (isLoggedIn()) $token=getToken();
1955
1956     // Fill all template fields.
1957     $data = array(
1958         'linkcount' => count($LINKSDB),
1959         'previous_page_url' => $previous_page_url,
1960         'next_page_url' => $next_page_url,
1961         'page_current' => $page,
1962         'page_max' => $pagecount,
1963         'result_count' => count($linksToDisplay),
1964         'search_type' => $search_type,
1965         'search_crits' => $search_crits,
1966         'redirector' => empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'],  // Optional redirector URL.
1967         'token' => $token,
1968         'links' => $linkDisp,
1969         'tags' => $LINKSDB->allTags(),
1970     );
1971
1972     $pluginManager = PluginManager::getInstance();
1973     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
1974
1975     foreach ($data as $key => $value) {
1976         $PAGE->assign($key, $value);
1977     }
1978
1979     return;
1980 }
1981
1982 // Compute the thumbnail for a link.
1983 //
1984 // With a link to the original URL.
1985 // Understands various services (youtube.com...)
1986 // Input: $url = URL for which the thumbnail must be found.
1987 //        $href = if provided, this URL will be followed instead of $url
1988 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1989 // Some of them may be missing.
1990 // Return an empty array if no thumbnail available.
1991 function computeThumbnail($url,$href=false)
1992 {
1993     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
1994     if ($href==false) $href=$url;
1995
1996     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1997     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1998     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1999     $domain = parse_url($url,PHP_URL_HOST);
2000     if ($domain=='youtube.com' || $domain=='www.youtube.com')
2001     {
2002         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
2003         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
2004                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2005     }
2006     if ($domain=='youtu.be') // Youtube short links
2007     {
2008         $path = parse_url($url,PHP_URL_PATH);
2009         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
2010                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2011     }
2012     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
2013     {
2014         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
2015         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
2016                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
2017     }
2018
2019     if ($domain=='imgur.com')
2020     {
2021         $path = parse_url($url,PHP_URL_PATH);
2022         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
2023         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
2024                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2025         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
2026                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2027
2028         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
2029                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2030     }
2031     if ($domain=='i.imgur.com')
2032     {
2033         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
2034         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
2035                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2036     }
2037     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
2038     {
2039         if (strpos($url,'dailymotion.com/video/')!==false)
2040         {
2041             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
2042             return array('src'=>$thumburl,
2043                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
2044         }
2045     }
2046     if (endsWith($domain,'.imageshack.us'))
2047     {
2048         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2049         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2050         {
2051             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
2052             return array('src'=>$thumburl,
2053                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
2054         }
2055     }
2056
2057     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
2058     // So we deport the thumbnail generation in order not to slow down page generation
2059     // (and we also cache the thumbnail)
2060
2061     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
2062
2063     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
2064         || $domain=='vimeo.com'
2065         || $domain=='ted.com' || endsWith($domain,'.ted.com')
2066         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
2067     )
2068     {
2069         if ($domain=='vimeo.com')
2070         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
2071             $path = parse_url($url,PHP_URL_PATH);
2072             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
2073         }
2074         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2075         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
2076             $path = parse_url($url,PHP_URL_PATH);
2077             if (!preg_match('!/\d+.+?!',$path)) return array();
2078         }
2079         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2080         {   // Make sure this TED URL points to a video (/talks/...)
2081             $path = parse_url($url,PHP_URL_PATH);
2082             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
2083         }
2084         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2085         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2086                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2087     }
2088
2089     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
2090     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
2091     // But using the extension will do.
2092     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2093     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2094     {
2095         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2096         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2097                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2098     }
2099     return array(); // No thumbnail.
2100
2101 }
2102
2103
2104 // Returns the HTML code to display a thumbnail for a link
2105 // with a link to the original URL.
2106 // Understands various services (youtube.com...)
2107 // Input: $url = URL for which the thumbnail must be found.
2108 //        $href = if provided, this URL will be followed instead of $url
2109 // Returns '' if no thumbnail available.
2110 function thumbnail($url,$href=false)
2111 {
2112     $t = computeThumbnail($url,$href);
2113     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2114
2115     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
2116     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2117     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2118     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2119     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2120     $html.='></a>';
2121     return $html;
2122 }
2123
2124 // Returns the HTML code to display a thumbnail for a link
2125 // for the picture wall (using lazy image loading)
2126 // Understands various services (youtube.com...)
2127 // Input: $url = URL for which the thumbnail must be found.
2128 //        $href = if provided, this URL will be followed instead of $url
2129 // Returns '' if no thumbnail available.
2130 function lazyThumbnail($url,$href=false)
2131 {
2132     $t = computeThumbnail($url,$href);
2133     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2134
2135     $html='<a href="'.escape($t['href']).'">';
2136
2137     // Lazy image
2138     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
2139
2140     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2141     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2142     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2143     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2144     $html.='>';
2145
2146     // No-JavaScript fallback.
2147     $html.='<noscript><img src="'.escape($t['src']).'"';
2148     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2149     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2150     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2151     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2152     $html.='></noscript></a>';
2153
2154     return $html;
2155 }
2156
2157
2158 // -----------------------------------------------------------------------------------------------
2159 // Installation
2160 // This function should NEVER be called if the file data/config.php exists.
2161 function install()
2162 {
2163     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2164     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2165
2166
2167     // This part makes sure sessions works correctly.
2168     // (Because on some hosts, session.save_path may not be set correctly,
2169     // or we may not have write access to it.)
2170     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2171     {   // Step 2: Check if data in session is correct.
2172         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2173         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2174         echo 'It currently points to '.session_save_path().'<br>';
2175         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2176         echo '<br><a href="?">Click to try again.</a></pre>';
2177         die;
2178     }
2179     if (!isset($_SESSION['session_tested']))
2180     {   // Step 1 : Try to store data in session and reload page.
2181         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2182         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
2183     }
2184     if (isset($_GET['test_session']))
2185     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2186         header('Location: '.index_url($_SERVER));
2187     }
2188
2189
2190     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2191     {
2192         $tz = 'UTC';
2193         if (!empty($_POST['continent']) && !empty($_POST['city'])) {
2194             if (isTimeZoneValid($_POST['continent'], $_POST['city'])) {
2195                 $tz = $_POST['continent'].'/'.$_POST['city'];
2196             }
2197         }
2198         $GLOBALS['timezone'] = $tz;
2199         // Everything is ok, let's create config file.
2200         $GLOBALS['login'] = $_POST['setlogin'];
2201         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2202         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2203         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(index_url($_SERVER)) : $_POST['title'] );
2204         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2205         try {
2206             writeConfig($GLOBALS, isLoggedIn());
2207         }
2208         catch(Exception $e) {
2209             error_log(
2210                     'ERROR while writing config file after installation.' . PHP_EOL .
2211                     $e->getMessage()
2212                 );
2213
2214             // TODO: do not handle exceptions/errors in JS.
2215             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2216             exit;
2217         }
2218         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2219         exit;
2220     }
2221
2222     // Display config form:
2223     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2224     $timezone_html = '';
2225     if ($timezone_form != '') {
2226         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2227     }
2228
2229     $PAGE = new pageBuilder;
2230     $PAGE->assign('timezone_html',$timezone_html);
2231     $PAGE->assign('timezone_js',$timezone_js);
2232     $PAGE->renderPage('install');
2233     exit;
2234 }
2235
2236 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2237    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2238    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2239    This function is called by passing the URL:
2240    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2241    [URL] is the URL of the link (e.g. a flickr page)
2242    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2243    The function below will fetch the image from the webservice and store it in the cache.
2244 */
2245 function genThumbnail()
2246 {
2247     // Make sure the parameters in the URL were generated by us.
2248     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2249     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2250
2251     // Let's see if we don't already have the image for this URL in the cache.
2252     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2253     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2254     {   // We have the thumbnail, just serve it:
2255         header('Content-Type: image/jpeg');
2256         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2257         return;
2258     }
2259     // We may also serve a blank image (if service did not respond)
2260     $blankname=hash('sha1',$_GET['url']).'.gif';
2261     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2262     {
2263         header('Content-Type: image/gif');
2264         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2265         return;
2266     }
2267
2268     // Otherwise, generate the thumbnail.
2269     $url = $_GET['url'];
2270     $domain = parse_url($url,PHP_URL_HOST);
2271
2272     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2273     {
2274         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2275         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2276
2277         // Is this a link to an image, or to a flickr page ?
2278         $imageurl='';
2279         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2280         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2281             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2282             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2283         }
2284         else // This is a flickr page (html)
2285         {
2286             // Get the flickr html page.
2287             list($headers, $data) = get_http_url($url, 20);
2288             if (strpos($headers[0], '200 OK') !== false)
2289             {
2290                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2291                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!',$data,$matches);
2292                 if (!empty($matches[1])) $imageurl=$matches[1];
2293
2294                 // In albums (and some other pages), the link rel="image_src" is not provided,
2295                 // but flickr provides:
2296                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2297                 if ($imageurl=='')
2298                 {
2299                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!',$data,$matches);
2300                     if (!empty($matches[1])) $imageurl=$matches[1];
2301                 }
2302             }
2303         }
2304
2305         if ($imageurl!='')
2306         {   // Let's download the image.
2307             // Image is 240x120, so 10 seconds to download should be enough.
2308             list($headers, $data) = get_http_url($imageurl, 10);
2309             if (strpos($headers[0], '200 OK') !== false) {
2310                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2311                 header('Content-Type: image/jpeg');
2312                 echo $data;
2313                 return;
2314             }
2315         }
2316     }
2317
2318     elseif ($domain=='vimeo.com' )
2319     {
2320         // This is more complex: we have to perform a HTTP request, then parse the result.
2321         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2322         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2323         list($headers, $data) = get_http_url('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2324         if (strpos($headers[0], '200 OK') !== false) {
2325             $t = unserialize($data);
2326             $imageurl = $t[0]['thumbnail_medium'];
2327             // Then we download the image and serve it to our client.
2328             list($headers, $data) = get_http_url($imageurl, 10);
2329             if (strpos($headers[0], '200 OK') !== false) {
2330                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname,$data); // Save image to cache.
2331                 header('Content-Type: image/jpeg');
2332                 echo $data;
2333                 return;
2334             }
2335         }
2336     }
2337
2338     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2339     {
2340         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2341         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2342         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2343         list($headers, $data) = get_http_url($url, 5);
2344         if (strpos($headers[0], '200 OK') !== false) {
2345             // Extract the link to the thumbnail
2346             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!',$data,$matches);
2347             if (!empty($matches[1]))
2348             {   // Let's download the image.
2349                 $imageurl=$matches[1];
2350                 // No control on image size, so wait long enough
2351                 list($headers, $data) = get_http_url($imageurl, 20);
2352                 if (strpos($headers[0], '200 OK') !== false) {
2353                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2354                     file_put_contents($filepath,$data); // Save image to cache.
2355                     if (resizeImage($filepath))
2356                     {
2357                         header('Content-Type: image/jpeg');
2358                         echo file_get_contents($filepath);
2359                         return;
2360                     }
2361                 }
2362             }
2363         }
2364     }
2365
2366     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2367     {
2368         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2369         // http://xkcd.com/327/
2370         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2371         list($headers, $data) = get_http_url($url, 5);
2372         if (strpos($headers[0], '200 OK') !== false) {
2373             // Extract the link to the thumbnail
2374             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!',$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($filepath);
2387                         return;
2388                     }
2389                 }
2390             }
2391         }
2392     }
2393
2394     else
2395     {
2396         // For all other domains, we try to download the image and make a thumbnail.
2397         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2398         list($headers, $data) = get_http_url($url, 30);
2399         if (strpos($headers[0], '200 OK') !== false) {
2400             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2401             file_put_contents($filepath,$data); // Save image to cache.
2402             if (resizeImage($filepath))
2403             {
2404                 header('Content-Type: image/jpeg');
2405                 echo file_get_contents($filepath);
2406                 return;
2407             }
2408         }
2409     }
2410
2411
2412     // Otherwise, return an empty image (8x8 transparent gif)
2413     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2414     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2415     header('Content-Type: image/gif');
2416     echo $blankgif;
2417 }
2418
2419 // Make a thumbnail of the image (to width: 120 pixels)
2420 // Returns true if success, false otherwise.
2421 function resizeImage($filepath)
2422 {
2423     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2424
2425     // Trick: some stupid people rename GIF as JPEG... or else.
2426     // So we really try to open each image type whatever the extension is.
2427     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2428     $im=false;
2429     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2430     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2431     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2432     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2433     $w = imagesx($im);
2434     $h = imagesy($im);
2435     $ystart = 0; $yheight=$h;
2436     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2437     $nw = 120;   // Desired width
2438     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2439     // Resize image:
2440     $im2 = imagecreatetruecolor($nw,$nh);
2441     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2442     imageinterlace($im2,true); // For progressive JPEG.
2443     $tempname=$filepath.'_TEMP.jpg';
2444     imagejpeg($im2, $tempname, 90);
2445     imagedestroy($im);
2446     imagedestroy($im2);
2447     unlink($filepath);
2448     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2449     return true;
2450 }
2451
2452 try {
2453     mergeDeprecatedConfig($GLOBALS, isLoggedIn());
2454 } catch(Exception $e) {
2455     error_log(
2456         'ERROR while merging deprecated options.php file.' . PHP_EOL .
2457         $e->getMessage()
2458     );
2459 }
2460
2461 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2462 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2463 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2464 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2465 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=daily')) { showDaily(); exit; }
2466 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2467 renderPage();
2468 ?>