index.php

   1 <?php
   2 /**
   3  * Shaarli v0.6.3 - Shaare your links...
   4  *
   5  * The personal, minimalist, super-fast, no-database Delicious clone.
   6  *
   7  * Friendly fork by the Shaarli community:
   8  *  - https://github.com/shaarli/Shaarli
   9  *
  10  * Original project by sebsauvage.net:
  11  *  - http://sebsauvage.net/wiki/doku.php?id=php:shaarli
  12  *  - https://github.com/sebsauvage/Shaarli
  13  *
  14  * Licence: http://www.opensource.org/licenses/zlib-license.php
  15  *
  16  * Requires: PHP 5.3.x
  17  */
  18
  19 // Set 'UTC' as the default timezone if it is not defined in php.ini
  20 // See http://php.net/manual/en/datetime.configuration.php#ini.date.timezone
  21 if (date_default_timezone_get() == '') {
  22     date_default_timezone_set('UTC');
  23 }
  24
  25 /* -----------------------------------------------------------------------------
  26  * Hardcoded parameters
  27  * You should not touch any code below (or at your own risks!)
  28  * (These parameters can be overwritten by editing the file /data/config.php)
  29  * -----------------------------------------------------------------------------
  30  */
  31
  32 /*
  33  * Shaarli directories & configuration files
  34  */
  35 // Data subdirectory
  36 $GLOBALS['config']['DATADIR'] = 'data';
  37
  38 // Main configuration file
  39 $GLOBALS['config']['CONFIG_FILE'] = $GLOBALS['config']['DATADIR'].'/config.php';
  40
  41 // Link datastore
  42 $GLOBALS['config']['DATASTORE'] = $GLOBALS['config']['DATADIR'].'/datastore.php';
  43
  44 // Banned IPs
  45 $GLOBALS['config']['IPBANS_FILENAME'] = $GLOBALS['config']['DATADIR'].'/ipbans.php';
  46
  47 // Access log
  48 $GLOBALS['config']['LOG_FILE'] = $GLOBALS['config']['DATADIR'].'/log.txt';
  49
  50 // For updates check of Shaarli
  51 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt';
  52
  53 // RainTPL cache directory (keep the trailing slash!)
  54 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp/';
  55 // Raintpl template directory (keep the trailing slash!)
  56 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/';
  57
  58 // Thumbnail cache directory
  59 $GLOBALS['config']['CACHEDIR'] = 'cache';
  60
  61 // Atom & RSS feed cache directory
  62 $GLOBALS['config']['PAGECACHE'] = 'pagecache';
  63
  64
  65 /*
  66  * Global configuration
  67  */
  68 // Ban IP after this many failures
  69 $GLOBALS['config']['BAN_AFTER'] = 4;
  70 // Ban duration for IP address after login failures (in seconds)
  71 $GLOBALS['config']['BAN_DURATION'] = 1800;
  72
  73 // Feed options
  74 // Enable RSS permalinks by default.
  75 // This corresponds to the default behavior of shaarli before this was added as an option.
  76 $GLOBALS['config']['ENABLE_RSS_PERMALINKS'] = true;
  77 // If true, an extra "ATOM feed" button will be displayed in the toolbar
  78 $GLOBALS['config']['SHOW_ATOM'] = false;
  79
  80 // Link display options
  81 $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = false;
  82 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false;
  83 $GLOBALS['config']['LINKS_PER_PAGE'] = 20;
  84
  85 // Open Shaarli (true): anyone can add/edit/delete links without having to login
  86 $GLOBALS['config']['OPEN_SHAARLI'] = false;
  87
  88 // Thumbnails
  89 // Display thumbnails in links
  90 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true;
  91 // Store thumbnails in a local cache
  92 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true;
  93
  94 // Update check frequency for Shaarli. 86400 seconds=24 hours
  95 $GLOBALS['config']['UPDATECHECK_BRANCH'] = 'stable';
  96 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400;
  97
  98
  99 /*
 100  * Plugin configuration
 101  *
 102  * Warning: order matters!
 103  *
 104  * These settings may be be overriden in:
 105  *  - data/config.php
 106  *  - each plugin's configuration file
 107  */
 108 //$GLOBALS['config']['ENABLED_PLUGINS'] = array(
 109 //    'qrcode', 'archiveorg', 'readityourself', 'demo_plugin', 'playvideos',
 110 //    'wallabag', 'markdown', 'addlink_toolbar',
 111 //);
 112 $GLOBALS['config']['ENABLED_PLUGINS'] = array('qrcode');
 113
 114 // Initialize plugin parameters array.
 115 $GLOBALS['plugins'] = array();
 116
 117 // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
 118 $GLOBALS['config']['PUBSUBHUB_URL'] = '';
 119
 120 /*
 121  * PHP configuration
 122  */
 123 define('shaarli_version', '0.6.3');
 124
 125 // http://server.com/x/shaarli --> /shaarli/
 126 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
 127
 128 // High execution time in case of problematic imports/exports.
 129 ini_set('max_input_time','60');
 130
 131 // Try to set max upload file size and read
 132 ini_set('memory_limit', '128M');
 133 ini_set('post_max_size', '16M');
 134 ini_set('upload_max_filesize', '16M');
 135
 136 // See all error except warnings
 137 error_reporting(E_ALL^E_WARNING);
 138 // See all errors (for debugging only)
 139 //error_reporting(-1);
 140
 141 /*
 142  * User configuration
 143  */
 144 if (is_file($GLOBALS['config']['CONFIG_FILE'])) {
 145     require_once $GLOBALS['config']['CONFIG_FILE'];
 146 }
 147
 148 // Shaarli library
 149 require_once 'application/ApplicationUtils.php';
 150 require_once 'application/Cache.php';
 151 require_once 'application/CachedPage.php';
 152 require_once 'application/FileUtils.php';
 153 require_once 'application/HttpUtils.php';
 154 require_once 'application/LinkDB.php';
 155 require_once 'application/LinkFilter.php';
 156 require_once 'application/LinkUtils.php';
 157 require_once 'application/TimeZone.php';
 158 require_once 'application/Url.php';
 159 require_once 'application/Utils.php';
 160 require_once 'application/Config.php';
 161 require_once 'application/PluginManager.php';
 162 require_once 'application/Router.php';
 163
 164 // Ensure the PHP version is supported
 165 try {
 166     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
 167 } catch(Exception $exc) {
 168     header('Content-Type: text/plain; charset=utf-8');
 169     echo $exc->getMessage();
 170     exit;
 171 }
 172
 173 // Force cookie path (but do not change lifetime)
 174 $cookie = session_get_cookie_params();
 175 $cookiedir = '';
 176 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
 177     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
 178 }
 179 // Set default cookie expiration and path.
 180 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 181 // Set session parameters on server side.
 182 // If the user does not access any page within this time, his/her session is considered expired.
 183 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 184 // Use cookies to store session.
 185 ini_set('session.use_cookies', 1);
 186 // Force cookies for session (phpsessionID forbidden in URL).
 187 ini_set('session.use_only_cookies', 1);
 188 // Prevent PHP form using sessionID in URL if cookies are disabled.
 189 ini_set('session.use_trans_sid', false);
 190
 191 session_name('shaarli');
 192 // Start session if needed (Some server auto-start sessions).
 193 if (session_id() == '') {
 194     session_start();
 195 }
 196
 197 // Regenerate session ID if invalid or not defined in cookie.
 198 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 199     session_regenerate_id(true);
 200     $_COOKIE['shaarli'] = session_id();
 201 }
 202
 203 include "inc/rain.tpl.class.php"; //include Rain TPL
 204 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
 205 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
 206
 207 $pluginManager = PluginManager::getInstance();
 208 $pluginManager->load($GLOBALS['config']['ENABLED_PLUGINS']);
 209
 210 ob_start();  // Output buffering for the page cache.
 211
 212
 213 // In case stupid admin has left magic_quotes enabled in php.ini:
 214 if (get_magic_quotes_gpc())
 215 {
 216     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 217     $_POST = array_map('stripslashes_deep', $_POST);
 218     $_GET = array_map('stripslashes_deep', $_GET);
 219     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 220 }
 221
 222 // Prevent caching on client side or proxy: (yes, it's ugly)
 223 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 224 header("Cache-Control: no-store, no-cache, must-revalidate");
 225 header("Cache-Control: post-check=0, pre-check=0", false);
 226 header("Pragma: no-cache");
 227
 228 // Handling of old config file which do not have the new parameters.
 229 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(index_url($_SERVER));
 230 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 231 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 232 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 233 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 234 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 235 // I really need to rewrite Shaarli with a proper configuation manager.
 236
 237 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 238     // Ensure Shaarli has proper access to its resources
 239     $errors = ApplicationUtils::checkResourcePermissions($GLOBALS['config']);
 240
 241     if ($errors != array()) {
 242         $message = '<p>Insufficient permissions:</p><ul>';
 243
 244         foreach ($errors as $error) {
 245             $message .= '<li>'.$error.'</li>';
 246         }
 247         $message .= '</ul>';
 248
 249         header('Content-Type: text/html; charset=utf-8');
 250         echo $message;
 251         exit;
 252     }
 253
 254     // Display the installation form if no existing config is found
 255     install();
 256 }
 257
 258 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 259 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 260 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 261
 262 // a token depending of deployment salt, user password, and the current ip
 263 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 264
 265 autoLocale(); // Sniff browser language and set date format accordingly.
 266 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 267
 268 //==================================================================================================
 269 // Checking session state (i.e. is the user still logged in)
 270 //==================================================================================================
 271
 272 function setup_login_state() {
 273         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 274             return true;
 275         }
 276         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 277         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 278         if (!isset($GLOBALS['login'])) {
 279             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 280             $loginFailure = true;
 281         }
 282         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 283             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 284             !$loginFailure)
 285         {
 286             fillSessionInfo();
 287             $userIsLoggedIn = true;
 288         }
 289         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 290         if (empty($_SESSION['uid']) ||
 291             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 292             time() >= $_SESSION['expires_on'])
 293         {
 294             logout();
 295             $userIsLoggedIn = false;
 296             $loginFailure = true;
 297         }
 298         if (!empty($_SESSION['longlastingsession'])) {
 299             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 300         }
 301         else {
 302             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 303         }
 304         if (!$loginFailure) {
 305             $userIsLoggedIn = true;
 306         }
 307
 308         return $userIsLoggedIn;
 309 }
 310 $userIsLoggedIn = setup_login_state();
 311
 312
 313 // ------------------------------------------------------------------------------------------
 314 // Sniff browser language to display dates in the right format automatically.
 315 // (Note that is may not work on your server if the corresponding local is not installed.)
 316 function autoLocale()
 317 {
 318     $attempts = array('en_US'); // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 319     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 320     {   // (It's a bit crude, but it works very well. Preferred language is always presented first.)
 321         if (preg_match('/([a-z]{2})-?([a-z]{2})?/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) {
 322             $loc = $matches[1] . (!empty($matches[2]) ? '_' . strtoupper($matches[2]) : '');
 323             $attempts = array($loc.'.UTF-8', $loc, str_replace('_', '-', $loc).'.UTF-8', str_replace('_', '-', $loc),
 324                 $loc . '_' . strtoupper($loc).'.UTF-8', $loc . '_' . strtoupper($loc),
 325                 $loc . '_' . $loc.'.UTF-8', $loc . '_' . $loc, $loc . '-' . strtoupper($loc).'.UTF-8',
 326                 $loc . '-' . strtoupper($loc), $loc . '-' . $loc.'.UTF-8', $loc . '-' . $loc);
 327         }
 328     }
 329     setlocale(LC_TIME, $attempts);  // LC_TIME = Set local for date/time format only.
 330 }
 331
 332 // ------------------------------------------------------------------------------------------
 333 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 334 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 335 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 336 function pubsubhub()
 337 {
 338     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 339     {
 340        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 341        $topic_url = array (
 342                        index_url($_SERVER).'?do=atom',
 343                        index_url($_SERVER).'?do=rss'
 344                     );
 345        $p->publish_update($topic_url);
 346     }
 347 }
 348
 349 // ------------------------------------------------------------------------------------------
 350 // Session management
 351
 352 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 353 function allIPs()
 354 {
 355     $ip = $_SERVER["REMOTE_ADDR"];
 356     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 357     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 358     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 359     return $ip;
 360 }
 361
 362 function fillSessionInfo() {
 363         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 364         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 365         $_SESSION['username']=$GLOBALS['login'];
 366         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 367 }
 368
 369 // Check that user/password is correct.
 370 function check_auth($login,$password)
 371 {
 372     $hash = sha1($password.$login.$GLOBALS['salt']);
 373     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 374     {   // Login/password is correct.
 375                 fillSessionInfo();
 376         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login successful');
 377         return True;
 378     }
 379     logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login failed for user '.$login);
 380     return False;
 381 }
 382
 383 // Returns true if the user is logged in.
 384 function isLoggedIn()
 385 {
 386     global $userIsLoggedIn;
 387     return $userIsLoggedIn;
 388 }
 389
 390 // Force logout.
 391 function logout() {
 392     if (isset($_SESSION)) {
 393         unset($_SESSION['uid']);
 394         unset($_SESSION['ip']);
 395         unset($_SESSION['username']);
 396         unset($_SESSION['privateonly']);
 397     }
 398     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 399 }
 400
 401
 402 // ------------------------------------------------------------------------------------------
 403 // Brute force protection system
 404 // Several consecutive failed logins will ban the IP address for 30 minutes.
 405 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?>");
 406 include $GLOBALS['config']['IPBANS_FILENAME'];
 407 // Signal a failed login. Will ban the IP if too many failures:
 408 function ban_loginFailed()
 409 {
 410     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 411     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 412     $gb['FAILURES'][$ip]++;
 413     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 414     {
 415         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 416         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'IP address banned from login');
 417     }
 418     $GLOBALS['IPBANS'] = $gb;
 419     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 420 }
 421
 422 // Signals a successful login. Resets failed login counter.
 423 function ban_loginOk()
 424 {
 425     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 426     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 427     $GLOBALS['IPBANS'] = $gb;
 428     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 429 }
 430
 431 // Checks if the user CAN login. If 'true', the user can try to login.
 432 function ban_canLogin()
 433 {
 434     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 435     if (isset($gb['BANS'][$ip]))
 436     {
 437         // User is banned. Check if the ban has expired:
 438         if ($gb['BANS'][$ip]<=time())
 439         {   // Ban expired, user can try to login again.
 440             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Ban lifted.');
 441             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 442             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 443             return true; // Ban has expired, user can login.
 444         }
 445         return false; // User is banned.
 446     }
 447     return true; // User is not banned.
 448 }
 449
 450 // ------------------------------------------------------------------------------------------
 451 // Process login form: Check if login/password is correct.
 452 if (isset($_POST['login']))
 453 {
 454     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 455     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 456     {   // Login/password is OK.
 457         ban_loginOk();
 458         // If user wants to keep the session cookie even after the browser closes:
 459         if (!empty($_POST['longlastingsession']))
 460         {
 461                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 462             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 463             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 464
 465             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 466             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 467             // Note: Never forget the trailing slash on the cookie path!
 468             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 469         }
 470         else // Standard session expiration (=when browser closes)
 471         {
 472             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 473             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 474             session_regenerate_id(true);
 475         }
 476
 477         // Optional redirect after login:
 478         if (isset($_GET['post'])) {
 479             $uri = '?post='. urlencode($_GET['post']);
 480             foreach (array('description', 'source', 'title') as $param) {
 481                 if (!empty($_GET[$param])) {
 482                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 483                 }
 484             }
 485             header('Location: '. $uri);
 486             exit;
 487         }
 488
 489         if (isset($_GET['edit_link'])) {
 490             header('Location: ?edit_link='. escape($_GET['edit_link']));
 491             exit;
 492         }
 493
 494         if (isset($_POST['returnurl'])) {
 495             // Prevent loops over login screen.
 496             if (strpos($_POST['returnurl'], 'do=login') === false) {
 497                 header('Location: '. escape($_POST['returnurl']));
 498                 exit;
 499             }
 500         }
 501         header('Location: ?'); exit;
 502     }
 503     else
 504     {
 505         ban_loginFailed();
 506         $redir = '';
 507         if (isset($_GET['post'])) {
 508             $redir = '?post=' . urlencode($_GET['post']);
 509             foreach (array('description', 'source', 'title') as $param) {
 510                 if (!empty($_GET[$param])) {
 511                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 512                 }
 513             }
 514         }
 515         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 516         exit;
 517     }
 518 }
 519
 520 // ------------------------------------------------------------------------------------------
 521 // Misc utility functions:
 522
 523 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 524 function return_bytes($val)
 525 {
 526     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 527     switch($last)
 528     {
 529         case 'g': $val *= 1024;
 530         case 'm': $val *= 1024;
 531         case 'k': $val *= 1024;
 532     }
 533     return $val;
 534 }
 535
 536 // Try to determine max file size for uploads (POST).
 537 // Returns an integer (in bytes)
 538 function getMaxFileSize()
 539 {
 540     $size1 = return_bytes(ini_get('post_max_size'));
 541     $size2 = return_bytes(ini_get('upload_max_filesize'));
 542     // Return the smaller of two:
 543     $maxsize = min($size1,$size2);
 544     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 545     return $maxsize;
 546 }
 547
 548 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 549     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 550     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 551 function linkdate2timestamp($linkdate)
 552 {
 553     if(strcmp($linkdate, '_000000') !== 0 || !$linkdate){
 554         $Y=$M=$D=$h=$m=$s=0;
 555         $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 556         return mktime($h,$m,$s,$M,$D,$Y);
 557     }
 558     return time();
 559 }
 560
 561 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 562     (used to build the pubDate attribute in RSS feed.)  */
 563 function linkdate2rfc822($linkdate)
 564 {
 565     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 566 }
 567
 568 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 569     (used to build the updated tags in ATOM feed.)  */
 570 function linkdate2iso8601($linkdate)
 571 {
 572     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 573 }
 574
 575 // ------------------------------------------------------------------------------------------
 576 // Token management for XSRF protection
 577 // Token should be used in any form which acts on data (create,update,delete,import...).
 578 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 579
 580 // Returns a token.
 581 function getToken()
 582 {
 583     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 584     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 585     return $rnd;
 586 }
 587
 588 // Tells if a token is OK. Using this function will destroy the token.
 589 // true=token is OK.
 590 function tokenOk($token)
 591 {
 592     if (isset($_SESSION['tokens'][$token]))
 593     {
 594         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 595         return true; // Token is OK.
 596     }
 597     return false; // Wrong token, or already used.
 598 }
 599
 600 // ------------------------------------------------------------------------------------------
 601 /* This class is in charge of building the final page.
 602    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 603    p = new pageBuilder;
 604    p.assign('myfield','myvalue');
 605    p.renderPage('mytemplate');
 606
 607 */
 608 class pageBuilder
 609 {
 610     private $tpl; // RainTPL template
 611
 612     function __construct()
 613     {
 614         $this->tpl = false;
 615     }
 616
 617     /**
 618      * Initialize all default tpl tags.
 619      */
 620     private function initialize()
 621     {
 622         $this->tpl = new RainTPL;
 623
 624         try {
 625             $version = ApplicationUtils::checkUpdate(
 626                 shaarli_version,
 627                 $GLOBALS['config']['UPDATECHECK_FILENAME'],
 628                 $GLOBALS['config']['UPDATECHECK_INTERVAL'],
 629                 $GLOBALS['config']['ENABLE_UPDATECHECK'],
 630                 isLoggedIn(),
 631                 $GLOBALS['config']['UPDATECHECK_BRANCH']
 632             );
 633             $this->tpl->assign('newVersion', escape($version));
 634             $this->tpl->assign('versionError', '');
 635
 636         } catch (Exception $exc) {
 637             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], $exc->getMessage());
 638             $this->tpl->assign('newVersion', '');
 639             $this->tpl->assign('versionError', escape($exc->getMessage()));
 640         }
 641
 642         $this->tpl->assign('feedurl', escape(index_url($_SERVER)));
 643         $searchcrits = ''; // Search criteria
 644         if (!empty($_GET['searchtags'])) {
 645             $searchcrits .= '&searchtags=' . urlencode($_GET['searchtags']);
 646         }
 647         elseif (!empty($_GET['searchterm'])) {
 648             $searchcrits .= '&searchterm=' . urlencode($_GET['searchterm']);
 649         }
 650         $this->tpl->assign('searchcrits', $searchcrits);
 651         $this->tpl->assign('source', index_url($_SERVER));
 652         $this->tpl->assign('version', shaarli_version);
 653         $this->tpl->assign('scripturl', index_url($_SERVER));
 654         $this->tpl->assign('pagetitle', 'Shaarli');
 655         $this->tpl->assign('privateonly', !empty($_SESSION['privateonly'])); // Show only private links?
 656         if (!empty($GLOBALS['title'])) {
 657             $this->tpl->assign('pagetitle', $GLOBALS['title']);
 658         }
 659         if (!empty($GLOBALS['titleLink'])) {
 660             $this->tpl->assign('titleLink', $GLOBALS['titleLink']);
 661         }
 662         if (!empty($GLOBALS['pagetitle'])) {
 663             $this->tpl->assign('pagetitle', $GLOBALS['pagetitle']);
 664         }
 665         $this->tpl->assign('shaarlititle', empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title']);
 666         if (!empty($GLOBALS['plugin_errors'])) {
 667             $this->tpl->assign('plugin_errors', $GLOBALS['plugin_errors']);
 668         }
 669     }
 670
 671     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 672     public function assign($what,$where)
 673     {
 674         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 675         $this->tpl->assign($what,$where);
 676     }
 677
 678     // Render a specific page (using a template).
 679     // e.g. pb.renderPage('picwall')
 680     public function renderPage($page)
 681     {
 682         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 683         $this->tpl->draw($page);
 684     }
 685
 686     /**
 687     * Render a 404 page (uses the template : tpl/404.tpl)
 688     *
 689     * usage : $PAGE->render404('The link was deleted')
 690     * @param string $message A messate to display what is not found
 691     */
 692     public function render404($message='The page you are trying to reach does not exist or has been deleted.') {
 693         header($_SERVER['SERVER_PROTOCOL'] . ' 404 Not Found');
 694         $this->tpl->assign('error_message', $message);
 695         $this->renderPage('404');
 696     }
 697 }
 698
 699 // ------------------------------------------------------------------------------------------
 700 // Output the last N links in RSS 2.0 format.
 701 function showRSS()
 702 {
 703     header('Content-Type: application/rss+xml; charset=utf-8');
 704
 705     // $usepermalink : If true, use permalink instead of final link.
 706     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=rss&permalinks
 707     // Also enabled through a config option
 708     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 709
 710     // Cache system
 711     $query = $_SERVER["QUERY_STRING"];
 712     $cache = new CachedPage(
 713         $GLOBALS['config']['PAGECACHE'],
 714         page_url($_SERVER),
 715         startsWith($query,'do=rss') && !isLoggedIn()
 716     );
 717     $cached = $cache->cachedVersion();
 718     if (! empty($cached)) {
 719         echo $cached;
 720         exit;
 721     }
 722
 723     // If cached was not found (or not usable), then read the database and build the response:
 724     $LINKSDB = new LinkDB(
 725         $GLOBALS['config']['DATASTORE'],
 726         isLoggedIn(),
 727         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 728         $GLOBALS['redirector']
 729     );
 730     // Read links from database (and filter private links if user it not logged in).
 731
 732     // Optionally filter the results:
 733     if (!empty($_GET['searchterm'])) {
 734         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
 735     }
 736     elseif (!empty($_GET['searchtags'])) {
 737         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
 738     }
 739     else {
 740         $linksToDisplay = $LINKSDB;
 741     }
 742
 743     $nblinksToDisplay = 50;  // Number of links to display.
 744     // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 745     if (!empty($_GET['nb'])) {
 746         $nblinksToDisplay = $_GET['nb'] == 'all' ? count($linksToDisplay) : max(intval($_GET['nb']), 1);
 747     }
 748
 749     $pageaddr = escape(index_url($_SERVER));
 750     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 751     echo '<channel><title>'.$GLOBALS['title'].'</title><link>'.$pageaddr.'</link>';
 752     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 753     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 754     {
 755         echo '<!-- PubSubHubbub Discovery -->';
 756         echo '<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 757         echo '<link rel="self" href="'.$pageaddr.'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 758         echo '<!-- End Of PubSubHubbub Discovery -->';
 759     }
 760     $i=0;
 761     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 762     while ($i<$nblinksToDisplay && $i<count($keys))
 763     {
 764         $link = $linksToDisplay[$keys[$i]];
 765         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 766         $rfc822date = linkdate2rfc822($link['linkdate']);
 767         $absurl = $link['url'];
 768         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 769         if ($usepermalinks===true)
 770             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 771         else
 772             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 773         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.escape($rfc822date)."</pubDate>\n";
 774         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 775         {
 776             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.$pageaddr.'">'.$tag.'</category>'."\n"; }
 777         }
 778
 779         // Add permalink in description
 780         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 781         // If user wants permalinks first, put the final link in description
 782         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 783         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 784         echo '<description><![CDATA['.
 785             format_description($link['description'], $GLOBALS['redirector']) .
 786             $descriptionlink . ']]></description>' . "\n</item>\n";
 787         $i++;
 788     }
 789     echo '</channel></rss><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 790
 791     $cache->cache(ob_get_contents());
 792     ob_end_flush();
 793     exit;
 794 }
 795
 796 // ------------------------------------------------------------------------------------------
 797 // Output the last N links in ATOM format.
 798 function showATOM()
 799 {
 800     header('Content-Type: application/atom+xml; charset=utf-8');
 801
 802     // $usepermalink : If true, use permalink instead of final link.
 803     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
 804     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 805
 806     // Cache system
 807     $query = $_SERVER["QUERY_STRING"];
 808     $cache = new CachedPage(
 809         $GLOBALS['config']['PAGECACHE'],
 810         page_url($_SERVER),
 811         startsWith($query,'do=atom') && !isLoggedIn()
 812     );
 813     $cached = $cache->cachedVersion();
 814     if (!empty($cached)) {
 815         echo $cached;
 816         exit;
 817     }
 818
 819     // If cached was not found (or not usable), then read the database and build the response:
 820     // Read links from database (and filter private links if used it not logged in).
 821     $LINKSDB = new LinkDB(
 822         $GLOBALS['config']['DATASTORE'],
 823         isLoggedIn(),
 824         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 825         $GLOBALS['redirector']
 826     );
 827
 828     // Optionally filter the results:
 829     if (!empty($_GET['searchterm'])) {
 830         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
 831     }
 832     else if (!empty($_GET['searchtags'])) {
 833         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
 834     }
 835     else {
 836         $linksToDisplay = $LINKSDB;
 837     }
 838
 839     $nblinksToDisplay = 50;  // Number of links to display.
 840     // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 841     if (!empty($_GET['nb'])) {
 842         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max(intval($_GET['nb']), 1);
 843     }
 844
 845     $pageaddr=escape(index_url($_SERVER));
 846     $latestDate = '';
 847     $entries='';
 848     $i=0;
 849     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 850     while ($i<$nblinksToDisplay && $i<count($keys))
 851     {
 852         $link = $linksToDisplay[$keys[$i]];
 853         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 854         $iso8601date = linkdate2iso8601($link['linkdate']);
 855         $latestDate = max($latestDate,$iso8601date);
 856         $absurl = $link['url'];
 857         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 858         $entries.='<entry><title>'.$link['title'].'</title>';
 859         if ($usepermalinks===true)
 860             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
 861         else
 862             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
 863         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.escape($iso8601date).'</updated>';
 864
 865         // Add permalink in description
 866         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 867         // If user wants permalinks first, put the final link in description
 868         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 869         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 870
 871         $entries .= '<content type="html"><![CDATA['.
 872             format_description($link['description'], $GLOBALS['redirector']) .
 873             $descriptionlink . "]]></content>\n";
 874         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
 875         {
 876             foreach(explode(' ',$link['tags']) as $tag)
 877                 { $entries.='<category scheme="'.$pageaddr.'" term="'.$tag.'" />'."\n"; }
 878         }
 879         $entries.="</entry>\n";
 880         $i++;
 881     }
 882     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
 883     $feed.='<title>'.$GLOBALS['title'].'</title>';
 884     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.escape($latestDate).'</updated>';
 885     $feed.='<link rel="self" href="'.escape(server_url($_SERVER).$_SERVER["REQUEST_URI"]).'" />';
 886     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 887     {
 888         $feed.='<!-- PubSubHubbub Discovery -->';
 889         $feed.='<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
 890         $feed.='<!-- End Of PubSubHubbub Discovery -->';
 891     }
 892     $feed.='<author><name>'.$pageaddr.'</name><uri>'.$pageaddr.'</uri></author>';
 893     $feed.='<id>'.$pageaddr.'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
 894     $feed.=$entries;
 895     $feed.='</feed><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 896     echo $feed;
 897
 898     $cache->cache(ob_get_contents());
 899     ob_end_flush();
 900     exit;
 901 }
 902
 903 // ------------------------------------------------------------------------------------------
 904 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 905 // Gives the last 7 days (which have links).
 906 // This RSS feed cannot be filtered.
 907 function showDailyRSS() {
 908     // Cache system
 909     $query = $_SERVER["QUERY_STRING"];
 910     $cache = new CachedPage(
 911         $GLOBALS['config']['PAGECACHE'],
 912         page_url($_SERVER),
 913         startsWith($query,'do=dailyrss') && !isLoggedIn()
 914     );
 915     $cached = $cache->cachedVersion();
 916     if (!empty($cached)) {
 917         echo $cached;
 918         exit;
 919     }
 920
 921     // If cached was not found (or not usable), then read the database and build the response:
 922     // Read links from database (and filter private links if used it not logged in).
 923     $LINKSDB = new LinkDB(
 924         $GLOBALS['config']['DATASTORE'],
 925         isLoggedIn(),
 926         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 927         $GLOBALS['redirector']
 928     );
 929
 930     /* Some Shaarlies may have very few links, so we need to look
 931        back in time (rsort()) until we have enough days ($nb_of_days).
 932     */
 933     $linkdates = array();
 934     foreach ($LINKSDB as $linkdate => $value) {
 935         $linkdates[] = $linkdate;
 936     }
 937     rsort($linkdates);
 938     $nb_of_days = 7; // We take 7 days.
 939     $today = Date('Ymd');
 940     $days = array();
 941
 942     foreach ($linkdates as $linkdate) {
 943         $day = substr($linkdate, 0, 8); // Extract day (without time)
 944         if (strcmp($day,$today) < 0) {
 945             if (empty($days[$day])) {
 946                 $days[$day] = array();
 947             }
 948             $days[$day][] = $linkdate;
 949         }
 950
 951         if (count($days) > $nb_of_days) {
 952             break; // Have we collected enough days?
 953         }
 954     }
 955
 956     // Build the RSS feed.
 957     header('Content-Type: application/rss+xml; charset=utf-8');
 958     $pageaddr = escape(index_url($_SERVER));
 959     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 960     echo '<channel>';
 961     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 962     echo '<link>'. $pageaddr .'</link>';
 963     echo '<description>Daily shared links</description>';
 964     echo '<language>en-en</language>';
 965     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 966
 967     // For each day.
 968     foreach ($days as $day => $linkdates) {
 969         $daydate = linkdate2timestamp($day.'_000000'); // Full text date
 970         $rfc822date = linkdate2rfc822($day.'_000000');
 971         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 972
 973         // Build the HTML body of this RSS entry.
 974         $html = '';
 975         $href = '';
 976         $links = array();
 977
 978         // We pre-format some fields for proper output.
 979         foreach ($linkdates as $linkdate) {
 980             $l = $LINKSDB[$linkdate];
 981             $l['formatedDescription'] = format_description($l['description'], $GLOBALS['redirector']);
 982             $l['thumbnail'] = thumbnail($l['url']);
 983             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
 984             if (startsWith($l['url'], '?')) {
 985                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 986             }
 987             $links[$linkdate] = $l;
 988         }
 989
 990         // Then build the HTML for this day:
 991         $tpl = new RainTPL;
 992         $tpl->assign('title', $GLOBALS['title']);
 993         $tpl->assign('daydate', $daydate);
 994         $tpl->assign('absurl', $absurl);
 995         $tpl->assign('links', $links);
 996         $tpl->assign('rfc822date', escape($rfc822date));
 997         $html = $tpl->draw('dailyrss', $return_string=true);
 998
 999         echo $html . PHP_EOL;
1000     }
1001     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
1002
1003     $cache->cache(ob_get_contents());
1004     ob_end_flush();
1005     exit;
1006 }
1007
1008 /**
1009  * Show the 'Daily' page.
1010  *
1011  * @param PageBuilder $pageBuilder Template engine wrapper.
1012  */
1013 function showDaily($pageBuilder)
1014 {
1015     $LINKSDB = new LinkDB(
1016         $GLOBALS['config']['DATASTORE'],
1017         isLoggedIn(),
1018         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1019         $GLOBALS['redirector']
1020     );
1021
1022     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
1023     if (isset($_GET['day'])) $day=$_GET['day'];
1024
1025     $days = $LINKSDB->days();
1026     $i = array_search($day,$days);
1027     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
1028     $previousday='';
1029     $nextday='';
1030     if ($i!==false)
1031     {
1032         if ($i>=1) $previousday=$days[$i-1];
1033         if ($i<count($days)-1) $nextday=$days[$i+1];
1034     }
1035
1036     try {
1037         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_DAY, $day);
1038     } catch (Exception $exc) {
1039         error_log($exc);
1040         $linksToDisplay = array();
1041     }
1042
1043     // We pre-format some fields for proper output.
1044     foreach($linksToDisplay as $key=>$link)
1045     {
1046
1047         $taglist = explode(' ',$link['tags']);
1048         uasort($taglist, 'strcasecmp');
1049         $linksToDisplay[$key]['taglist']=$taglist;
1050         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $GLOBALS['redirector']);
1051         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
1052         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
1053     }
1054
1055     /* We need to spread the articles on 3 columns.
1056        I did not want to use a JavaScript lib like http://masonry.desandro.com/
1057        so I manually spread entries with a simple method: I roughly evaluate the
1058        height of a div according to title and description length.
1059     */
1060     $columns=array(array(),array(),array()); // Entries to display, for each column.
1061     $fill=array(0,0,0);  // Rough estimate of columns fill.
1062     foreach($linksToDisplay as $key=>$link)
1063     {
1064         // Roughly estimate length of entry (by counting characters)
1065         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
1066         // Description: 836 characters gives roughly 342 pixel height.
1067         // This is not perfect, but it's usually OK.
1068         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
1069         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
1070         // Then put in column which is the less filled:
1071         $smallest=min($fill); // find smallest value in array.
1072         $index=array_search($smallest,$fill); // find index of this smallest value.
1073         array_push($columns[$index],$link); // Put entry in this column.
1074         $fill[$index]+=$length;
1075     }
1076
1077     $data = array(
1078         'linksToDisplay' => $linksToDisplay,
1079         'linkcount' => count($LINKSDB),
1080         'cols' => $columns,
1081         'day' => linkdate2timestamp($day.'_000000'),
1082         'previousday' => $previousday,
1083         'nextday' => $nextday,
1084     );
1085     $pluginManager = PluginManager::getInstance();
1086     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
1087
1088     foreach ($data as $key => $value) {
1089         $pageBuilder->assign($key, $value);
1090     }
1091
1092     $pageBuilder->renderPage('daily');
1093     exit;
1094 }
1095
1096 // Renders the linklist
1097 function showLinkList($PAGE, $LINKSDB) {
1098     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1099     $PAGE->renderPage('linklist');
1100 }
1101
1102
1103 // ------------------------------------------------------------------------------------------
1104 // Render HTML page (according to URL parameters and user rights)
1105 function renderPage()
1106 {
1107     $LINKSDB = new LinkDB(
1108         $GLOBALS['config']['DATASTORE'],
1109         isLoggedIn(),
1110         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1111         $GLOBALS['redirector']
1112     );
1113
1114     $PAGE = new pageBuilder;
1115
1116     // Determine which page will be rendered.
1117     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
1118     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
1119
1120     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
1121     // Then assign generated data to RainTPL.
1122     $common_hooks = array(
1123         'header',
1124         'footer',
1125         'includes',
1126     );
1127     $pluginManager = PluginManager::getInstance();
1128     foreach($common_hooks as $name) {
1129         $plugin_data = array();
1130         $pluginManager->executeHooks('render_' . $name, $plugin_data,
1131             array(
1132                 'target' => $targetPage,
1133                 'loggedin' => isLoggedIn()
1134             )
1135         );
1136         $PAGE->assign('plugins_' . $name, $plugin_data);
1137     }
1138
1139     // -------- Display login form.
1140     if ($targetPage == Router::$PAGE_LOGIN)
1141     {
1142         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1143         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1144         $PAGE->assign('token',$token);
1145         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
1146         $PAGE->renderPage('loginform');
1147         exit;
1148     }
1149     // -------- User wants to logout.
1150     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1151     {
1152         invalidateCaches($GLOBALS['config']['PAGECACHE']);
1153         logout();
1154         header('Location: ?');
1155         exit;
1156     }
1157
1158     // -------- Picture wall
1159     if ($targetPage == Router::$PAGE_PICWALL)
1160     {
1161         // Optionally filter the results:
1162         if (!empty($_GET['searchterm'])) {
1163             $links = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
1164         }
1165         elseif (! empty($_GET['searchtags'])) {
1166             $links = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
1167         }
1168         else {
1169             $links = $LINKSDB;
1170         }
1171
1172         $linksToDisplay = array();
1173
1174         // Get only links which have a thumbnail.
1175         foreach($links as $link)
1176         {
1177             $permalink='?'.escape(smallhash($link['linkdate']));
1178             $thumb=lazyThumbnail($link['url'],$permalink);
1179             if ($thumb!='') // Only output links which have a thumbnail.
1180             {
1181                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1182                 $linksToDisplay[]=$link; // Add to array.
1183             }
1184         }
1185
1186         $data = array(
1187             'linkcount' => count($LINKSDB),
1188             'linksToDisplay' => $linksToDisplay,
1189         );
1190         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
1191
1192         foreach ($data as $key => $value) {
1193             $PAGE->assign($key, $value);
1194         }
1195
1196         $PAGE->renderPage('picwall');
1197         exit;
1198     }
1199
1200     // -------- Tag cloud
1201     if ($targetPage == Router::$PAGE_TAGCLOUD)
1202     {
1203         $tags= $LINKSDB->allTags();
1204
1205         // We sort tags alphabetically, then choose a font size according to count.
1206         // First, find max value.
1207         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1208         ksort($tags);
1209         $tagList=array();
1210         foreach($tags as $key=>$value)
1211         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1212         {
1213             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1214         }
1215
1216         $data = array(
1217             'linkcount' => count($LINKSDB),
1218             'tags' => $tagList,
1219         );
1220         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
1221
1222         foreach ($data as $key => $value) {
1223             $PAGE->assign($key, $value);
1224         }
1225
1226         $PAGE->renderPage('tagcloud');
1227         exit;
1228     }
1229
1230     // Daily page.
1231     if ($targetPage == Router::$PAGE_DAILY) {
1232         showDaily($PAGE);
1233     }
1234
1235     // Display openseach plugin (XML)
1236     if ($targetPage == Router::$PAGE_OPENSEARCH) {
1237         header('Content-Type: application/xml; charset=utf-8');
1238         $PAGE->assign('serverurl', index_url($_SERVER));
1239         $PAGE->renderPage('opensearch');
1240         exit;
1241     }
1242
1243     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1244     if (isset($_GET['addtag']))
1245     {
1246         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1247         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1248         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1249
1250         // Prevent redirection loop
1251         if (isset($params['addtag'])) {
1252             unset($params['addtag']);
1253         }
1254
1255         // Check if this tag is already in the search query and ignore it if it is.
1256         // Each tag is always separated by a space
1257         if (isset($params['searchtags'])) {
1258             $current_tags = explode(' ', $params['searchtags']);
1259         } else {
1260             $current_tags = array();
1261         }
1262         $addtag = true;
1263         foreach ($current_tags as $value) {
1264             if ($value === $_GET['addtag']) {
1265                 $addtag = false;
1266                 break;
1267             }
1268         }
1269         // Append the tag if necessary
1270         if (empty($params['searchtags'])) {
1271             $params['searchtags'] = trim($_GET['addtag']);
1272         }
1273         else if ($addtag) {
1274             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1275         }
1276
1277         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1278         header('Location: ?'.http_build_query($params));
1279         exit;
1280     }
1281
1282     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1283     if (isset($_GET['removetag'])) {
1284         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1285         if (empty($_SERVER['HTTP_REFERER'])) {
1286             header('Location: ?');
1287             exit;
1288         }
1289
1290         // In case browser does not send HTTP_REFERER
1291         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1292
1293         // Prevent redirection loop
1294         if (isset($params['removetag'])) {
1295             unset($params['removetag']);
1296         }
1297
1298         if (isset($params['searchtags'])) {
1299             $tags = explode(' ', $params['searchtags']);
1300             // Remove value from array $tags.
1301             $tags = array_diff($tags, array($_GET['removetag']));
1302             $params['searchtags'] = implode(' ',$tags);
1303
1304             if (empty($params['searchtags'])) {
1305                 unset($params['searchtags']);
1306             }
1307
1308             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1309         }
1310         header('Location: ?'.http_build_query($params));
1311         exit;
1312     }
1313
1314     // -------- User wants to change the number of links per page (linksperpage=...)
1315     if (isset($_GET['linksperpage'])) {
1316         if (is_numeric($_GET['linksperpage'])) {
1317             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1318         }
1319
1320         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1321         exit;
1322     }
1323
1324     // -------- User wants to see only private links (toggle)
1325     if (isset($_GET['privateonly'])) {
1326         if (empty($_SESSION['privateonly'])) {
1327             $_SESSION['privateonly'] = 1; // See only private links
1328         } else {
1329             unset($_SESSION['privateonly']); // See all links
1330         }
1331
1332         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1333         exit;
1334     }
1335
1336     // -------- Handle other actions allowed for non-logged in users:
1337     if (!isLoggedIn())
1338     {
1339         // User tries to post new link but is not logged in:
1340         // Show login screen, then redirect to ?post=...
1341         if (isset($_GET['post']))
1342         {
1343             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1344             exit;
1345         }
1346
1347                 // Same case as above except that user tried to access ?do=addlink without being logged in
1348                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1349                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1350                         header('Location: ?do=login&post=');
1351                         exit;
1352                 }
1353         showLinkList($PAGE, $LINKSDB);
1354         if (isset($_GET['edit_link'])) {
1355             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1356             exit;
1357         }
1358
1359         exit; // Never remove this one! All operations below are reserved for logged in user.
1360     }
1361
1362     // -------- All other functions are reserved for the registered user:
1363
1364     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1365     if ($targetPage == Router::$PAGE_TOOLS)
1366     {
1367         $data = array(
1368             'linkcount' => count($LINKSDB),
1369             'pageabsaddr' => index_url($_SERVER),
1370         );
1371         $pluginManager->executeHooks('render_tools', $data);
1372
1373         foreach ($data as $key => $value) {
1374             $PAGE->assign($key, $value);
1375         }
1376
1377         $PAGE->renderPage('tools');
1378         exit;
1379     }
1380
1381     // -------- User wants to change his/her password.
1382     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1383     {
1384         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1385         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1386         {
1387             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1388
1389             // Make sure old password is correct.
1390             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1391             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1392             // Save new password
1393             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1394             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1395             try {
1396                 writeConfig($GLOBALS, isLoggedIn());
1397             }
1398             catch(Exception $e) {
1399                 error_log(
1400                     'ERROR while writing config file after changing password.' . PHP_EOL .
1401                     $e->getMessage()
1402                 );
1403
1404                 // TODO: do not handle exceptions/errors in JS.
1405                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1406                 exit;
1407             }
1408             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1409             exit;
1410         }
1411         else // show the change password form.
1412         {
1413             $PAGE->assign('linkcount',count($LINKSDB));
1414             $PAGE->assign('token',getToken());
1415             $PAGE->renderPage('changepassword');
1416             exit;
1417         }
1418     }
1419
1420     // -------- User wants to change configuration
1421     if ($targetPage == Router::$PAGE_CONFIGURE)
1422     {
1423         if (!empty($_POST['title']) )
1424         {
1425             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1426             $tz = 'UTC';
1427             if (!empty($_POST['continent']) && !empty($_POST['city']))
1428                 if (isTimeZoneValid($_POST['continent'],$_POST['city']))
1429                     $tz = $_POST['continent'].'/'.$_POST['city'];
1430             $GLOBALS['timezone'] = $tz;
1431             $GLOBALS['title']=$_POST['title'];
1432             $GLOBALS['titleLink']=$_POST['titleLink'];
1433             $GLOBALS['redirector']=$_POST['redirector'];
1434             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1435             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1436             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1437             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1438             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1439             try {
1440                 writeConfig($GLOBALS, isLoggedIn());
1441             }
1442             catch(Exception $e) {
1443                 error_log(
1444                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1445                     $e->getMessage()
1446                 );
1447
1448                 // TODO: do not handle exceptions/errors in JS.
1449                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1450                 exit;
1451             }
1452             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1453             exit;
1454         }
1455         else // Show the configuration form.
1456         {
1457             $PAGE->assign('linkcount',count($LINKSDB));
1458             $PAGE->assign('token',getToken());
1459             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1460             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1461             list($timezone_form, $timezone_js) = generateTimeZoneForm($GLOBALS['timezone']);
1462             $PAGE->assign('timezone_form', $timezone_form);
1463             $PAGE->assign('timezone_js',$timezone_js);
1464             $PAGE->renderPage('configure');
1465             exit;
1466         }
1467     }
1468
1469     // -------- User wants to rename a tag or delete it
1470     if ($targetPage == Router::$PAGE_CHANGETAG)
1471     {
1472         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1473             $PAGE->assign('linkcount', count($LINKSDB));
1474             $PAGE->assign('token', getToken());
1475             $PAGE->assign('tags', $LINKSDB->allTags());
1476             $PAGE->renderPage('changetag');
1477             exit;
1478         }
1479
1480         if (!tokenOk($_POST['token'])) {
1481             die('Wrong token.');
1482         }
1483
1484         // Delete a tag:
1485         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1486             $needle=trim($_POST['fromtag']);
1487             // True for case-sensitive tag search.
1488             $linksToAlter = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $needle, true);
1489             foreach($linksToAlter as $key=>$value)
1490             {
1491                 $tags = explode(' ',trim($value['tags']));
1492                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1493                 $value['tags']=trim(implode(' ',$tags));
1494                 $LINKSDB[$key]=$value;
1495             }
1496             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1497             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1498             exit;
1499         }
1500
1501         // Rename a tag:
1502         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1503             $needle=trim($_POST['fromtag']);
1504             // True for case-sensitive tag search.
1505             $linksToAlter = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $needle, true);
1506             foreach($linksToAlter as $key=>$value)
1507             {
1508                 $tags = explode(' ',trim($value['tags']));
1509                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1510                 $value['tags']=trim(implode(' ',$tags));
1511                 $LINKSDB[$key]=$value;
1512             }
1513             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1514             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1515             exit;
1516         }
1517     }
1518
1519     // -------- User wants to add a link without using the bookmarklet: Show form.
1520     if ($targetPage == Router::$PAGE_ADDLINK)
1521     {
1522         $PAGE->assign('linkcount',count($LINKSDB));
1523         $PAGE->renderPage('addlink');
1524         exit;
1525     }
1526
1527     // -------- User clicked the "Save" button when editing a link: Save link to database.
1528     if (isset($_POST['save_edit']))
1529     {
1530         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1531         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1532         $tags = implode(' ', array_unique(explode(' ', $tags))); // Remove duplicates.
1533         $linkdate=$_POST['lf_linkdate'];
1534         $url = trim($_POST['lf_url']);
1535         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?') && !startsWith($url,'javascript:'))
1536             $url = 'http://'.$url;
1537         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1538                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1539         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1540
1541         $pluginManager->executeHooks('save_link', $link);
1542
1543         $LINKSDB[$linkdate] = $link;
1544         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1545         pubsubhub();
1546
1547         // If we are called from the bookmarklet, we must close the popup:
1548         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1549             echo '<script>self.close();</script>';
1550             exit;
1551         }
1552
1553         $returnurl = !empty($_POST['returnurl']) ? escape($_POST['returnurl']): '?';
1554         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1555         $location .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1556         header('Location: '. $location); // After saving the link, redirect to the page the user was on.
1557         exit;
1558     }
1559
1560     // -------- User clicked the "Cancel" button when editing a link.
1561     if (isset($_POST['cancel_edit']))
1562     {
1563         // If we are called from the bookmarklet, we must close the popup:
1564         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1565         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1566         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1567         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1568         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1569         exit;
1570     }
1571
1572     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1573     if (isset($_POST['delete_link']))
1574     {
1575         if (!tokenOk($_POST['token'])) die('Wrong token.');
1576         // We do not need to ask for confirmation:
1577         // - confirmation is handled by JavaScript
1578         // - we are protected from XSRF by the token.
1579         $linkdate=$_POST['lf_linkdate'];
1580
1581         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1582
1583         unset($LINKSDB[$linkdate]);
1584         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // save to disk
1585
1586         // If we are called from the bookmarklet, we must close the popup:
1587         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1588         // Pick where we're going to redirect
1589         // =============================================================
1590         // Basically, we can't redirect to where we were previously if it was a permalink
1591         // or an edit_link, because it would 404.
1592         // Cases:
1593         //    - /             : nothing in $_GET, redirect to self
1594         //    - /?page        : redirect to self
1595         //    - /?searchterm  : redirect to self (there might be other links)
1596         //    - /?searchtags  : redirect to self
1597         //    - /permalink    : redirect to / (the link does not exist anymore)
1598         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1599         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1600         // redirect is not satisfied, and only then redirect to /
1601         $location = "?";
1602         // Self redirection
1603         if (count($_GET) == 0
1604             || isset($_GET['page'])
1605             || isset($_GET['searchterm'])
1606             || isset($_GET['searchtags'])
1607         ) {
1608             if (isset($_POST['returnurl'])) {
1609                 $location = $_POST['returnurl']; // Handle redirects given by the form
1610             } else {
1611                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1612             }
1613         }
1614
1615         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1616         exit;
1617     }
1618
1619     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1620     if (isset($_GET['edit_link']))
1621     {
1622         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1623         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1624         $data = array(
1625             'linkcount' => count($LINKSDB),
1626             'link' => $link,
1627             'link_is_new' => false,
1628             'token' => getToken(),
1629             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1630             'tags' => $LINKSDB->allTags(),
1631         );
1632         $pluginManager->executeHooks('render_editlink', $data);
1633
1634         foreach ($data as $key => $value) {
1635             $PAGE->assign($key, $value);
1636         }
1637
1638         $PAGE->renderPage('editlink');
1639         exit;
1640     }
1641
1642     // -------- User want to post a new link: Display link edit form.
1643     if (isset($_GET['post'])) {
1644         $url = cleanup_url(escape($_GET['post']));
1645
1646         $link_is_new = false;
1647         // Check if URL is not already in database (in this case, we will edit the existing link)
1648         $link = $LINKSDB->getLinkFromUrl($url);
1649         if (!$link)
1650         {
1651             $link_is_new = true;
1652             $linkdate = strval(date('Ymd_His'));
1653             // Get title if it was provided in URL (by the bookmarklet).
1654             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1655             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1656             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1657             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1658             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1659             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1660             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1661                 // Short timeout to keep the application responsive
1662                 list($headers, $content) = get_http_response($url, 4);
1663                 if (strpos($headers[0], '200 OK') !== false) {
1664                     // Retrieve charset.
1665                     $charset = get_charset($headers, $content);
1666                     // Extract title.
1667                     $title = html_extract_title($content);
1668                     // Re-encode title in utf-8 if necessary.
1669                     if (! empty($title) && $charset != 'utf-8') {
1670                         $title = mb_convert_encoding($title, $charset, 'utf-8');
1671                     }
1672                 }
1673             }
1674
1675             if ($url == '') {
1676                 $url = '?' . smallHash($linkdate);
1677                 $title = 'Note: ';
1678             }
1679
1680             $link = array(
1681                 'linkdate' => $linkdate,
1682                 'title' => $title,
1683                 'url' => $url,
1684                 'description' => $description,
1685                 'tags' => $tags,
1686                 'private' => $private
1687             );
1688         }
1689
1690         $data = array(
1691             'linkcount' => count($LINKSDB),
1692             'link' => $link,
1693             'link_is_new' => $link_is_new,
1694             'token' => getToken(), // XSRF protection.
1695             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1696             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1697             'tags' => $LINKSDB->allTags(),
1698         );
1699         $pluginManager->executeHooks('render_editlink', $data);
1700
1701         foreach ($data as $key => $value) {
1702             $PAGE->assign($key, $value);
1703         }
1704
1705         $PAGE->renderPage('editlink');
1706         exit;
1707     }
1708
1709     // -------- Export as Netscape Bookmarks HTML file.
1710     if ($targetPage == Router::$PAGE_EXPORT)
1711     {
1712         if (empty($_GET['what']))
1713         {
1714             $PAGE->assign('linkcount',count($LINKSDB));
1715             $PAGE->renderPage('export');
1716             exit;
1717         }
1718         $exportWhat=$_GET['what'];
1719         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1720
1721         header('Content-Type: text/html; charset=utf-8');
1722         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1723         $currentdate=date('Y/m/d H:i:s');
1724         echo <<<HTML
1725 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1726 <!-- This is an automatically generated file.
1727      It will be read and overwritten.
1728      DO NOT EDIT! -->
1729 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1730 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1731 <TITLE>Bookmarks</TITLE>
1732 <H1>Bookmarks</H1>
1733 HTML;
1734         foreach($LINKSDB as $link)
1735         {
1736             if ($exportWhat=='all' ||
1737                ($exportWhat=='private' && $link['private']!=0) ||
1738                ($exportWhat=='public' && $link['private']==0))
1739             {
1740                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1741                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1742                 echo '>'.$link['title']."</A>\n";
1743                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1744             }
1745         }
1746                 exit;
1747     }
1748
1749     // -------- User is uploading a file for import
1750     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1751     {
1752         // If file is too big, some form field may be missing.
1753         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1754         {
1755             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1756             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1757             exit;
1758         }
1759         if (!tokenOk($_POST['token'])) die('Wrong token.');
1760         importFile();
1761         exit;
1762     }
1763
1764     // -------- Show upload/import dialog:
1765     if ($targetPage == Router::$PAGE_IMPORT)
1766     {
1767         $PAGE->assign('linkcount',count($LINKSDB));
1768         $PAGE->assign('token',getToken());
1769         $PAGE->assign('maxfilesize',getMaxFileSize());
1770         $PAGE->renderPage('import');
1771         exit;
1772     }
1773
1774     // Plugin administration page
1775     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1776         $pluginMeta = $pluginManager->getPluginsMeta();
1777
1778         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1779         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1780         // Load parameters.
1781         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $GLOBALS['plugins']);
1782         uasort(
1783             $enabledPlugins,
1784             function($a, $b) { return $a['order'] - $b['order']; }
1785         );
1786         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1787
1788         $PAGE->assign('enabledPlugins', $enabledPlugins);
1789         $PAGE->assign('disabledPlugins', $disabledPlugins);
1790         $PAGE->renderPage('pluginsadmin');
1791         exit;
1792     }
1793
1794     // Plugin administration form action
1795     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1796         try {
1797             if (isset($_POST['parameters_form'])) {
1798                 unset($_POST['parameters_form']);
1799                 foreach ($_POST as $param => $value) {
1800                     $GLOBALS['plugins'][$param] = escape($value);
1801                 }
1802             }
1803             else {
1804                 $GLOBALS['config']['ENABLED_PLUGINS'] = save_plugin_config($_POST);
1805             }
1806             writeConfig($GLOBALS, isLoggedIn());
1807         }
1808         catch (Exception $e) {
1809             error_log(
1810                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1811                 $e->getMessage()
1812             );
1813
1814             // TODO: do not handle exceptions/errors in JS.
1815             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=pluginsadmin\';</script>';
1816             exit;
1817         }
1818         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1819         exit;
1820     }
1821
1822     // -------- Otherwise, simply display search form and links:
1823     showLinkList($PAGE, $LINKSDB);
1824     exit;
1825 }
1826
1827 // -----------------------------------------------------------------------------------------------
1828 // Process the import file form.
1829 function importFile()
1830 {
1831     if (!isLoggedIn()) { die('Not allowed.'); }
1832     $LINKSDB = new LinkDB(
1833         $GLOBALS['config']['DATASTORE'],
1834         isLoggedIn(),
1835         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1836         $GLOBALS['redirector']
1837     );
1838     $filename=$_FILES['filetoupload']['name'];
1839     $filesize=$_FILES['filetoupload']['size'];
1840     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1841     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1842     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1843     $import_count=0;
1844
1845     // Sniff file type:
1846     $type='unknown';
1847     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1848
1849     // Then import the bookmarks.
1850     if ($type=='netscape')
1851     {
1852         // This is a standard Netscape-style bookmark file.
1853         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1854         foreach(explode('<DT>',$data) as $html) // explode is very fast
1855         {
1856             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1857             $d = explode('<DD>',$html);
1858             if (startswith($d[0],'<A '))
1859             {
1860                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1861                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1862                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1863                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1864                 $raw_add_date=0;
1865                 foreach($matches as $m)
1866                 {
1867                     $attr=$m[1]; $value=$m[2];
1868                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1869                     elseif ($attr=='ADD_DATE')
1870                     {
1871                         $raw_add_date=intval($value);
1872                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1873                     }
1874                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1875                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1876                 }
1877                 if ($link['url']!='')
1878                 {
1879                     if ($private==1) $link['private']=1;
1880                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1881                     if ($dblink==false)
1882                     {  // Link not in database, let's import it...
1883                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1884
1885                        // Make sure date/time is not already used by another link.
1886                        // (Some bookmark files have several different links with the same ADD_DATE)
1887                        // We increment date by 1 second until we find a date which is not used in DB.
1888                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1889                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1890                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1891                        $LINKSDB[$link['linkdate']] = $link;
1892                        $import_count++;
1893                     }
1894                     else // Link already present in database.
1895                     {
1896                         if ($overwrite)
1897                         {   // If overwrite is required, we import link data, except date/time.
1898                             $link['linkdate']=$dblink['linkdate'];
1899                             $LINKSDB[$link['linkdate']] = $link;
1900                             $import_count++;
1901                         }
1902                     }
1903
1904                 }
1905             }
1906         }
1907         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1908
1909         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1910     }
1911     else
1912     {
1913         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1914     }
1915 }
1916
1917 // -----------------------------------------------------------------------------------------------
1918 // Template for the list of links (<div id="linklist">)
1919 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1920 function buildLinkList($PAGE,$LINKSDB)
1921 {
1922     // ---- Filter link database according to parameters
1923     $search_type = '';
1924     $search_crits = '';
1925     $privateonly = !empty($_SESSION['privateonly']) ? true : false;
1926
1927     // Fulltext search
1928     if (isset($_GET['searchterm'])) {
1929         $search_crits = escape(trim($_GET['searchterm']));
1930         $search_type = LinkFilter::$FILTER_TEXT;
1931         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits, false, $privateonly);
1932     }
1933     // Search by tag
1934     elseif (isset($_GET['searchtags'])) {
1935         $search_crits = explode(' ', escape(trim($_GET['searchtags'])));
1936         $search_type = LinkFilter::$FILTER_TAG;
1937         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits, false, $privateonly);
1938     }
1939     // Detect smallHashes in URL.
1940     elseif (isset($_SERVER['QUERY_STRING'])
1941         && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/', $_SERVER['QUERY_STRING'])) {
1942         $search_type = LinkFilter::$FILTER_HASH;
1943         $search_crits = substr(trim($_SERVER["QUERY_STRING"], '/'), 0, 6);
1944         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits);
1945
1946         if (count($linksToDisplay) == 0) {
1947             $PAGE->render404('The link you are trying to reach does not exist or has been deleted.');
1948             exit;
1949         }
1950     }
1951     // Otherwise, display without filtering.
1952     else {
1953         $linksToDisplay = $LINKSDB->filter('', '', false, $privateonly);
1954     }
1955
1956     // ---- Handle paging.
1957     $keys = array();
1958     foreach ($linksToDisplay as $key => $value) {
1959         $keys[] = $key;
1960     }
1961
1962     // If there is only a single link, we change on-the-fly the title of the page.
1963     if (count($linksToDisplay) == 1) {
1964         $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1965     }
1966
1967     // Select articles according to paging.
1968     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1969     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1970     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1971     $page = $page < 1 ? 1 : $page;
1972     $page = $page > $pagecount ? $pagecount : $page;
1973     // Start index.
1974     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1975     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1976     $linkDisp = array();
1977     while ($i<$end && $i<count($keys))
1978     {
1979         $link = $linksToDisplay[$keys[$i]];
1980         $link['description'] = format_description($link['description'], $GLOBALS['redirector']);
1981         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
1982         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
1983         $link['timestamp'] = linkdate2timestamp($link['linkdate']);
1984         $taglist = explode(' ', $link['tags']);
1985         uasort($taglist, 'strcasecmp');
1986         $link['taglist'] = $taglist;
1987         $link['shorturl'] = smallHash($link['linkdate']);
1988         // Check for both signs of a note: starting with ? and 7 chars long.
1989         if ($link['url'][0] === '?' &&
1990             strlen($link['url']) === 7) {
1991             $link['url'] = index_url($_SERVER) . $link['url'];
1992         }
1993
1994         $linkDisp[$keys[$i]] = $link;
1995         $i++;
1996     }
1997
1998     // Compute paging navigation
1999     $searchterm = empty($_GET['searchterm']) ? '' : '&searchterm=' . $_GET['searchterm'];
2000     $searchtags = empty($_GET['searchtags']) ? '' : '&searchtags=' . $_GET['searchtags'];
2001     $previous_page_url = '';
2002     if ($i != count($keys)) {
2003         $previous_page_url = '?page=' . ($page+1) . $searchterm . $searchtags;
2004     }
2005     $next_page_url='';
2006     if ($page>1) {
2007         $next_page_url = '?page=' . ($page-1) . $searchterm . $searchtags;
2008     }
2009
2010     $token = '';
2011     if (isLoggedIn()) {
2012         $token = getToken();
2013     }
2014
2015     // Fill all template fields.
2016     $data = array(
2017         'linkcount' => count($LINKSDB),
2018         'previous_page_url' => $previous_page_url,
2019         'next_page_url' => $next_page_url,
2020         'page_current' => $page,
2021         'page_max' => $pagecount,
2022         'result_count' => count($linksToDisplay),
2023         'search_type' => $search_type,
2024         'search_crits' => $search_crits,
2025         'redirector' => empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'],  // Optional redirector URL.
2026         'token' => $token,
2027         'links' => $linkDisp,
2028         'tags' => $LINKSDB->allTags(),
2029     );
2030     // FIXME! temporary fix - see #399.
2031     if (!empty($GLOBALS['pagetitle']) && count($linkDisp) == 1) {
2032         $data['pagetitle'] = $GLOBALS['pagetitle'];
2033     }
2034
2035     $pluginManager = PluginManager::getInstance();
2036     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
2037
2038     foreach ($data as $key => $value) {
2039         $PAGE->assign($key, $value);
2040     }
2041
2042     return;
2043 }
2044
2045 // Compute the thumbnail for a link.
2046 //
2047 // With a link to the original URL.
2048 // Understands various services (youtube.com...)
2049 // Input: $url = URL for which the thumbnail must be found.
2050 //        $href = if provided, this URL will be followed instead of $url
2051 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
2052 // Some of them may be missing.
2053 // Return an empty array if no thumbnail available.
2054 function computeThumbnail($url,$href=false)
2055 {
2056     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
2057     if ($href==false) $href=$url;
2058
2059     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
2060     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
2061     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
2062     $domain = parse_url($url,PHP_URL_HOST);
2063     if ($domain=='youtube.com' || $domain=='www.youtube.com')
2064     {
2065         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
2066         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
2067                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2068     }
2069     if ($domain=='youtu.be') // Youtube short links
2070     {
2071         $path = parse_url($url,PHP_URL_PATH);
2072         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
2073                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2074     }
2075     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
2076     {
2077         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
2078         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
2079                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
2080     }
2081
2082     if ($domain=='imgur.com')
2083     {
2084         $path = parse_url($url,PHP_URL_PATH);
2085         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
2086         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
2087                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2088         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
2089                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2090
2091         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
2092                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2093     }
2094     if ($domain=='i.imgur.com')
2095     {
2096         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
2097         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
2098                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2099     }
2100     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
2101     {
2102         if (strpos($url,'dailymotion.com/video/')!==false)
2103         {
2104             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
2105             return array('src'=>$thumburl,
2106                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
2107         }
2108     }
2109     if (endsWith($domain,'.imageshack.us'))
2110     {
2111         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2112         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2113         {
2114             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
2115             return array('src'=>$thumburl,
2116                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
2117         }
2118     }
2119
2120     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
2121     // So we deport the thumbnail generation in order not to slow down page generation
2122     // (and we also cache the thumbnail)
2123
2124     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
2125
2126     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
2127         || $domain=='vimeo.com'
2128         || $domain=='ted.com' || endsWith($domain,'.ted.com')
2129         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
2130     )
2131     {
2132         if ($domain=='vimeo.com')
2133         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
2134             $path = parse_url($url,PHP_URL_PATH);
2135             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
2136         }
2137         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2138         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
2139             $path = parse_url($url,PHP_URL_PATH);
2140             if (!preg_match('!/\d+.+?!',$path)) return array();
2141         }
2142         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2143         {   // Make sure this TED URL points to a video (/talks/...)
2144             $path = parse_url($url,PHP_URL_PATH);
2145             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
2146         }
2147         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2148         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2149                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2150     }
2151
2152     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
2153     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
2154     // But using the extension will do.
2155     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2156     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2157     {
2158         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2159         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2160                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2161     }
2162     return array(); // No thumbnail.
2163
2164 }
2165
2166
2167 // Returns the HTML code to display a thumbnail for a link
2168 // with a link to the original URL.
2169 // Understands various services (youtube.com...)
2170 // Input: $url = URL for which the thumbnail must be found.
2171 //        $href = if provided, this URL will be followed instead of $url
2172 // Returns '' if no thumbnail available.
2173 function thumbnail($url,$href=false)
2174 {
2175     $t = computeThumbnail($url,$href);
2176     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2177
2178     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
2179     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2180     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2181     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2182     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2183     $html.='></a>';
2184     return $html;
2185 }
2186
2187 // Returns the HTML code to display a thumbnail for a link
2188 // for the picture wall (using lazy image loading)
2189 // Understands various services (youtube.com...)
2190 // Input: $url = URL for which the thumbnail must be found.
2191 //        $href = if provided, this URL will be followed instead of $url
2192 // Returns '' if no thumbnail available.
2193 function lazyThumbnail($url,$href=false)
2194 {
2195     $t = computeThumbnail($url,$href);
2196     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2197
2198     $html='<a href="'.escape($t['href']).'">';
2199
2200     // Lazy image
2201     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
2202
2203     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2204     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2205     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2206     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2207     $html.='>';
2208
2209     // No-JavaScript fallback.
2210     $html.='<noscript><img src="'.escape($t['src']).'"';
2211     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2212     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2213     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2214     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2215     $html.='></noscript></a>';
2216
2217     return $html;
2218 }
2219
2220
2221 // -----------------------------------------------------------------------------------------------
2222 // Installation
2223 // This function should NEVER be called if the file data/config.php exists.
2224 function install()
2225 {
2226     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2227     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2228
2229
2230     // This part makes sure sessions works correctly.
2231     // (Because on some hosts, session.save_path may not be set correctly,
2232     // or we may not have write access to it.)
2233     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2234     {   // Step 2: Check if data in session is correct.
2235         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2236         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2237         echo 'It currently points to '.session_save_path().'<br>';
2238         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2239         echo '<br><a href="?">Click to try again.</a></pre>';
2240         die;
2241     }
2242     if (!isset($_SESSION['session_tested']))
2243     {   // Step 1 : Try to store data in session and reload page.
2244         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2245         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
2246     }
2247     if (isset($_GET['test_session']))
2248     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2249         header('Location: '.index_url($_SERVER));
2250     }
2251
2252
2253     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2254     {
2255         $tz = 'UTC';
2256         if (!empty($_POST['continent']) && !empty($_POST['city'])) {
2257             if (isTimeZoneValid($_POST['continent'], $_POST['city'])) {
2258                 $tz = $_POST['continent'].'/'.$_POST['city'];
2259             }
2260         }
2261         $GLOBALS['timezone'] = $tz;
2262         // Everything is ok, let's create config file.
2263         $GLOBALS['login'] = $_POST['setlogin'];
2264         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2265         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2266         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(index_url($_SERVER)) : $_POST['title'] );
2267         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2268         try {
2269             writeConfig($GLOBALS, isLoggedIn());
2270         }
2271         catch(Exception $e) {
2272             error_log(
2273                     'ERROR while writing config file after installation.' . PHP_EOL .
2274                     $e->getMessage()
2275                 );
2276
2277             // TODO: do not handle exceptions/errors in JS.
2278             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2279             exit;
2280         }
2281         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2282         exit;
2283     }
2284
2285     // Display config form:
2286     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2287     $timezone_html = '';
2288     if ($timezone_form != '') {
2289         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2290     }
2291
2292     $PAGE = new pageBuilder;
2293     $PAGE->assign('timezone_html',$timezone_html);
2294     $PAGE->assign('timezone_js',$timezone_js);
2295     $PAGE->renderPage('install');
2296     exit;
2297 }
2298
2299 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2300    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2301    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2302    This function is called by passing the URL:
2303    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2304    [URL] is the URL of the link (e.g. a flickr page)
2305    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2306    The function below will fetch the image from the webservice and store it in the cache.
2307 */
2308 function genThumbnail()
2309 {
2310     // Make sure the parameters in the URL were generated by us.
2311     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2312     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2313
2314     // Let's see if we don't already have the image for this URL in the cache.
2315     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2316     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2317     {   // We have the thumbnail, just serve it:
2318         header('Content-Type: image/jpeg');
2319         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2320         return;
2321     }
2322     // We may also serve a blank image (if service did not respond)
2323     $blankname=hash('sha1',$_GET['url']).'.gif';
2324     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2325     {
2326         header('Content-Type: image/gif');
2327         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2328         return;
2329     }
2330
2331     // Otherwise, generate the thumbnail.
2332     $url = $_GET['url'];
2333     $domain = parse_url($url,PHP_URL_HOST);
2334
2335     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2336     {
2337         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2338         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2339
2340         // Is this a link to an image, or to a flickr page ?
2341         $imageurl='';
2342         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2343         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2344             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2345             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2346         }
2347         else // This is a flickr page (html)
2348         {
2349             // Get the flickr html page.
2350             list($headers, $content) = get_http_response($url, 20);
2351             if (strpos($headers[0], '200 OK') !== false)
2352             {
2353                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2354                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2355                 if (!empty($matches[1])) $imageurl=$matches[1];
2356
2357                 // In albums (and some other pages), the link rel="image_src" is not provided,
2358                 // but flickr provides:
2359                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2360                 if ($imageurl=='')
2361                 {
2362                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2363                     if (!empty($matches[1])) $imageurl=$matches[1];
2364                 }
2365             }
2366         }
2367
2368         if ($imageurl!='')
2369         {   // Let's download the image.
2370             // Image is 240x120, so 10 seconds to download should be enough.
2371             list($headers, $content) = get_http_response($imageurl, 10);
2372             if (strpos($headers[0], '200 OK') !== false) {
2373                 // Save image to cache.
2374                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/' . $thumbname, $content);
2375                 header('Content-Type: image/jpeg');
2376                 echo $content;
2377                 return;
2378             }
2379         }
2380     }
2381
2382     elseif ($domain=='vimeo.com' )
2383     {
2384         // This is more complex: we have to perform a HTTP request, then parse the result.
2385         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2386         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2387         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2388         if (strpos($headers[0], '200 OK') !== false) {
2389             $t = unserialize($content);
2390             $imageurl = $t[0]['thumbnail_medium'];
2391             // Then we download the image and serve it to our client.
2392             list($headers, $content) = get_http_response($imageurl, 10);
2393             if (strpos($headers[0], '200 OK') !== false) {
2394                 // Save image to cache.
2395                 file_put_contents($GLOBALS['config']['CACHEDIR'] . '/' . $thumbname, $content);
2396                 header('Content-Type: image/jpeg');
2397                 echo $content;
2398                 return;
2399             }
2400         }
2401     }
2402
2403     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2404     {
2405         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2406         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2407         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2408         list($headers, $content) = get_http_response($url, 5);
2409         if (strpos($headers[0], '200 OK') !== false) {
2410             // Extract the link to the thumbnail
2411             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2412             if (!empty($matches[1]))
2413             {   // Let's download the image.
2414                 $imageurl=$matches[1];
2415                 // No control on image size, so wait long enough
2416                 list($headers, $content) = get_http_response($imageurl, 20);
2417                 if (strpos($headers[0], '200 OK') !== false) {
2418                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2419                     file_put_contents($filepath, $content); // Save image to cache.
2420                     if (resizeImage($filepath))
2421                     {
2422                         header('Content-Type: image/jpeg');
2423                         echo file_get_contents($filepath);
2424                         return;
2425                     }
2426                 }
2427             }
2428         }
2429     }
2430
2431     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2432     {
2433         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2434         // http://xkcd.com/327/
2435         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2436         list($headers, $content) = get_http_response($url, 5);
2437         if (strpos($headers[0], '200 OK') !== false) {
2438             // Extract the link to the thumbnail
2439             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2440             if (!empty($matches[1]))
2441             {   // Let's download the image.
2442                 $imageurl=$matches[1];
2443                 // No control on image size, so wait long enough
2444                 list($headers, $content) = get_http_response($imageurl, 20);
2445                 if (strpos($headers[0], '200 OK') !== false) {
2446                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2447                     // Save image to cache.
2448                     file_put_contents($filepath, $content);
2449                     if (resizeImage($filepath))
2450                     {
2451                         header('Content-Type: image/jpeg');
2452                         echo file_get_contents($filepath);
2453                         return;
2454                     }
2455                 }
2456             }
2457         }
2458     }
2459
2460     else
2461     {
2462         // For all other domains, we try to download the image and make a thumbnail.
2463         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2464         list($headers, $content) = get_http_response($url, 30);
2465         if (strpos($headers[0], '200 OK') !== false) {
2466             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2467             // Save image to cache.
2468             file_put_contents($filepath, $content);
2469             if (resizeImage($filepath))
2470             {
2471                 header('Content-Type: image/jpeg');
2472                 echo file_get_contents($filepath);
2473                 return;
2474             }
2475         }
2476     }
2477
2478
2479     // Otherwise, return an empty image (8x8 transparent gif)
2480     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2481     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2482     header('Content-Type: image/gif');
2483     echo $blankgif;
2484 }
2485
2486 // Make a thumbnail of the image (to width: 120 pixels)
2487 // Returns true if success, false otherwise.
2488 function resizeImage($filepath)
2489 {
2490     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2491
2492     // Trick: some stupid people rename GIF as JPEG... or else.
2493     // So we really try to open each image type whatever the extension is.
2494     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2495     $im=false;
2496     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2497     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2498     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2499     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2500     $w = imagesx($im);
2501     $h = imagesy($im);
2502     $ystart = 0; $yheight=$h;
2503     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2504     $nw = 120;   // Desired width
2505     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2506     // Resize image:
2507     $im2 = imagecreatetruecolor($nw,$nh);
2508     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2509     imageinterlace($im2,true); // For progressive JPEG.
2510     $tempname=$filepath.'_TEMP.jpg';
2511     imagejpeg($im2, $tempname, 90);
2512     imagedestroy($im);
2513     imagedestroy($im2);
2514     unlink($filepath);
2515     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2516     return true;
2517 }
2518
2519 try {
2520     mergeDeprecatedConfig($GLOBALS, isLoggedIn());
2521 } catch(Exception $e) {
2522     error_log(
2523         'ERROR while merging deprecated options.php file.' . PHP_EOL .
2524         $e->getMessage()
2525     );
2526 }
2527
2528 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2529 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2530 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2531 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2532 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2533 renderPage();
2534 ?>