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 // Processed updates file.
  48 $GLOBALS['config']['UPDATES_FILE'] = $GLOBALS['config']['DATADIR'].'/updates.txt';
  49
  50 // Access log
  51 $GLOBALS['config']['LOG_FILE'] = $GLOBALS['config']['DATADIR'].'/log.txt';
  52
  53 // For updates check of Shaarli
  54 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt';
  55
  56 // RainTPL cache directory (keep the trailing slash!)
  57 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp/';
  58 // Raintpl template directory (keep the trailing slash!)
  59 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/';
  60
  61 // Thumbnail cache directory
  62 $GLOBALS['config']['CACHEDIR'] = 'cache';
  63
  64 // Atom & RSS feed cache directory
  65 $GLOBALS['config']['PAGECACHE'] = 'pagecache';
  66
  67 /*
  68  * Global configuration
  69  */
  70 // Ban IP after this many failures
  71 $GLOBALS['config']['BAN_AFTER'] = 4;
  72 // Ban duration for IP address after login failures (in seconds)
  73 $GLOBALS['config']['BAN_DURATION'] = 1800;
  74
  75 // Feed options
  76 // Enable RSS permalinks by default.
  77 // This corresponds to the default behavior of shaarli before this was added as an option.
  78 $GLOBALS['config']['ENABLE_RSS_PERMALINKS'] = true;
  79 // If true, an extra "ATOM feed" button will be displayed in the toolbar
  80 $GLOBALS['config']['SHOW_ATOM'] = false;
  81
  82 // Link display options
  83 $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = false;
  84 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false;
  85 $GLOBALS['config']['LINKS_PER_PAGE'] = 20;
  86
  87 // Open Shaarli (true): anyone can add/edit/delete links without having to login
  88 $GLOBALS['config']['OPEN_SHAARLI'] = false;
  89
  90 // Thumbnails
  91 // Display thumbnails in links
  92 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true;
  93 // Store thumbnails in a local cache
  94 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true;
  95
  96 // Update check frequency for Shaarli. 86400 seconds=24 hours
  97 $GLOBALS['config']['UPDATECHECK_BRANCH'] = 'stable';
  98 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400;
  99
 100
 101 /*
 102  * Plugin configuration
 103  *
 104  * Warning: order matters!
 105  *
 106  * These settings may be be overriden in:
 107  *  - data/config.php
 108  *  - each plugin's configuration file
 109  */
 110 //$GLOBALS['config']['ENABLED_PLUGINS'] = array(
 111 //    'qrcode', 'archiveorg', 'readityourself', 'demo_plugin', 'playvideos',
 112 //    'wallabag', 'markdown', 'addlink_toolbar',
 113 //);
 114 $GLOBALS['config']['ENABLED_PLUGINS'] = array('qrcode');
 115
 116 //$GLOBALS['plugins']['WALLABAG_URL'] = 'https://demo.wallabag.org/';
 117
 118 // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
 119 $GLOBALS['config']['PUBSUBHUB_URL'] = '';
 120
 121 /*
 122  * PHP configuration
 123  */
 124 define('shaarli_version', '0.6.3');
 125
 126 // http://server.com/x/shaarli --> /shaarli/
 127 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
 128
 129 // High execution time in case of problematic imports/exports.
 130 ini_set('max_input_time','60');
 131
 132 // Try to set max upload file size and read
 133 ini_set('memory_limit', '128M');
 134 ini_set('post_max_size', '16M');
 135 ini_set('upload_max_filesize', '16M');
 136
 137 // See all error except warnings
 138 error_reporting(E_ALL^E_WARNING);
 139 // See all errors (for debugging only)
 140 //error_reporting(-1);
 141
 142 /*
 143  * User configuration
 144  */
 145 if (is_file($GLOBALS['config']['CONFIG_FILE'])) {
 146     require_once $GLOBALS['config']['CONFIG_FILE'];
 147 }
 148
 149 // Shaarli library
 150 require_once 'application/ApplicationUtils.php';
 151 require_once 'application/Cache.php';
 152 require_once 'application/CachedPage.php';
 153 require_once 'application/FileUtils.php';
 154 require_once 'application/HttpUtils.php';
 155 require_once 'application/LinkDB.php';
 156 require_once 'application/LinkFilter.php';
 157 require_once 'application/LinkUtils.php';
 158 require_once 'application/TimeZone.php';
 159 require_once 'application/Url.php';
 160 require_once 'application/Utils.php';
 161 require_once 'application/Config.php';
 162 require_once 'application/PluginManager.php';
 163 require_once 'application/Router.php';
 164 require_once 'application/Updater.php';
 165
 166 // Ensure the PHP version is supported
 167 try {
 168     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
 169 } catch(Exception $exc) {
 170     header('Content-Type: text/plain; charset=utf-8');
 171     echo $exc->getMessage();
 172     exit;
 173 }
 174
 175 // Force cookie path (but do not change lifetime)
 176 $cookie = session_get_cookie_params();
 177 $cookiedir = '';
 178 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
 179     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
 180 }
 181 // Set default cookie expiration and path.
 182 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 183 // Set session parameters on server side.
 184 // If the user does not access any page within this time, his/her session is considered expired.
 185 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 186 // Use cookies to store session.
 187 ini_set('session.use_cookies', 1);
 188 // Force cookies for session (phpsessionID forbidden in URL).
 189 ini_set('session.use_only_cookies', 1);
 190 // Prevent PHP form using sessionID in URL if cookies are disabled.
 191 ini_set('session.use_trans_sid', false);
 192
 193 session_name('shaarli');
 194 // Start session if needed (Some server auto-start sessions).
 195 if (session_id() == '') {
 196     session_start();
 197 }
 198
 199 // Regenerate session ID if invalid or not defined in cookie.
 200 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 201     session_regenerate_id(true);
 202     $_COOKIE['shaarli'] = session_id();
 203 }
 204
 205 include "inc/rain.tpl.class.php"; //include Rain TPL
 206 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
 207 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
 208
 209 $pluginManager = PluginManager::getInstance();
 210 $pluginManager->load($GLOBALS['config']['ENABLED_PLUGINS']);
 211
 212 ob_start();  // Output buffering for the page cache.
 213
 214
 215 // In case stupid admin has left magic_quotes enabled in php.ini:
 216 if (get_magic_quotes_gpc())
 217 {
 218     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 219     $_POST = array_map('stripslashes_deep', $_POST);
 220     $_GET = array_map('stripslashes_deep', $_GET);
 221     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 222 }
 223
 224 // Prevent caching on client side or proxy: (yes, it's ugly)
 225 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 226 header("Cache-Control: no-store, no-cache, must-revalidate");
 227 header("Cache-Control: post-check=0, pre-check=0", false);
 228 header("Pragma: no-cache");
 229
 230 // Handling of old config file which do not have the new parameters.
 231 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(index_url($_SERVER));
 232 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 233 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 234 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 235 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 236 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 237 // I really need to rewrite Shaarli with a proper configuation manager.
 238
 239 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 240     // Ensure Shaarli has proper access to its resources
 241     $errors = ApplicationUtils::checkResourcePermissions($GLOBALS['config']);
 242
 243     if ($errors != array()) {
 244         $message = '<p>Insufficient permissions:</p><ul>';
 245
 246         foreach ($errors as $error) {
 247             $message .= '<li>'.$error.'</li>';
 248         }
 249         $message .= '</ul>';
 250
 251         header('Content-Type: text/html; charset=utf-8');
 252         echo $message;
 253         exit;
 254     }
 255
 256     // Display the installation form if no existing config is found
 257     install();
 258 }
 259
 260 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 261 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 262 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 263
 264 // a token depending of deployment salt, user password, and the current ip
 265 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 266
 267 autoLocale(); // Sniff browser language and set date format accordingly.
 268 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 269
 270 //==================================================================================================
 271 // Checking session state (i.e. is the user still logged in)
 272 //==================================================================================================
 273
 274 function setup_login_state() {
 275         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 276             return true;
 277         }
 278         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 279         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 280         if (!isset($GLOBALS['login'])) {
 281             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 282             $loginFailure = true;
 283         }
 284         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 285             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 286             !$loginFailure)
 287         {
 288             fillSessionInfo();
 289             $userIsLoggedIn = true;
 290         }
 291         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 292         if (empty($_SESSION['uid']) ||
 293             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 294             time() >= $_SESSION['expires_on'])
 295         {
 296             logout();
 297             $userIsLoggedIn = false;
 298             $loginFailure = true;
 299         }
 300         if (!empty($_SESSION['longlastingsession'])) {
 301             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 302         }
 303         else {
 304             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 305         }
 306         if (!$loginFailure) {
 307             $userIsLoggedIn = true;
 308         }
 309
 310         return $userIsLoggedIn;
 311 }
 312 $userIsLoggedIn = setup_login_state();
 313
 314
 315 // ------------------------------------------------------------------------------------------
 316 // Sniff browser language to display dates in the right format automatically.
 317 // (Note that is may not work on your server if the corresponding local is not installed.)
 318 function autoLocale()
 319 {
 320     $attempts = array('en_US'); // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 321     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 322     {   // (It's a bit crude, but it works very well. Preferred language is always presented first.)
 323         if (preg_match('/([a-z]{2})-?([a-z]{2})?/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) {
 324             $loc = $matches[1] . (!empty($matches[2]) ? '_' . strtoupper($matches[2]) : '');
 325             $attempts = array($loc.'.UTF-8', $loc, str_replace('_', '-', $loc).'.UTF-8', str_replace('_', '-', $loc),
 326                 $loc . '_' . strtoupper($loc).'.UTF-8', $loc . '_' . strtoupper($loc),
 327                 $loc . '_' . $loc.'.UTF-8', $loc . '_' . $loc, $loc . '-' . strtoupper($loc).'.UTF-8',
 328                 $loc . '-' . strtoupper($loc), $loc . '-' . $loc.'.UTF-8', $loc . '-' . $loc);
 329         }
 330     }
 331     setlocale(LC_TIME, $attempts);  // LC_TIME = Set local for date/time format only.
 332 }
 333
 334 // ------------------------------------------------------------------------------------------
 335 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 336 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 337 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 338 function pubsubhub()
 339 {
 340     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 341     {
 342        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 343        $topic_url = array (
 344                        index_url($_SERVER).'?do=atom',
 345                        index_url($_SERVER).'?do=rss'
 346                     );
 347        $p->publish_update($topic_url);
 348     }
 349 }
 350
 351 // ------------------------------------------------------------------------------------------
 352 // Session management
 353
 354 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 355 function allIPs()
 356 {
 357     $ip = $_SERVER["REMOTE_ADDR"];
 358     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 359     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 360     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 361     return $ip;
 362 }
 363
 364 function fillSessionInfo() {
 365         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 366         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 367         $_SESSION['username']=$GLOBALS['login'];
 368         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 369 }
 370
 371 // Check that user/password is correct.
 372 function check_auth($login,$password)
 373 {
 374     $hash = sha1($password.$login.$GLOBALS['salt']);
 375     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 376     {   // Login/password is correct.
 377                 fillSessionInfo();
 378         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login successful');
 379         return True;
 380     }
 381     logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login failed for user '.$login);
 382     return False;
 383 }
 384
 385 // Returns true if the user is logged in.
 386 function isLoggedIn()
 387 {
 388     global $userIsLoggedIn;
 389     return $userIsLoggedIn;
 390 }
 391
 392 // Force logout.
 393 function logout() {
 394     if (isset($_SESSION)) {
 395         unset($_SESSION['uid']);
 396         unset($_SESSION['ip']);
 397         unset($_SESSION['username']);
 398         unset($_SESSION['privateonly']);
 399     }
 400     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 401 }
 402
 403
 404 // ------------------------------------------------------------------------------------------
 405 // Brute force protection system
 406 // Several consecutive failed logins will ban the IP address for 30 minutes.
 407 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?>");
 408 include $GLOBALS['config']['IPBANS_FILENAME'];
 409 // Signal a failed login. Will ban the IP if too many failures:
 410 function ban_loginFailed()
 411 {
 412     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 413     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 414     $gb['FAILURES'][$ip]++;
 415     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 416     {
 417         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 418         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'IP address banned from login');
 419     }
 420     $GLOBALS['IPBANS'] = $gb;
 421     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 422 }
 423
 424 // Signals a successful login. Resets failed login counter.
 425 function ban_loginOk()
 426 {
 427     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 428     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 429     $GLOBALS['IPBANS'] = $gb;
 430     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 431 }
 432
 433 // Checks if the user CAN login. If 'true', the user can try to login.
 434 function ban_canLogin()
 435 {
 436     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 437     if (isset($gb['BANS'][$ip]))
 438     {
 439         // User is banned. Check if the ban has expired:
 440         if ($gb['BANS'][$ip]<=time())
 441         {   // Ban expired, user can try to login again.
 442             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Ban lifted.');
 443             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 444             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 445             return true; // Ban has expired, user can login.
 446         }
 447         return false; // User is banned.
 448     }
 449     return true; // User is not banned.
 450 }
 451
 452 // ------------------------------------------------------------------------------------------
 453 // Process login form: Check if login/password is correct.
 454 if (isset($_POST['login']))
 455 {
 456     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 457     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 458     {   // Login/password is OK.
 459         ban_loginOk();
 460         // If user wants to keep the session cookie even after the browser closes:
 461         if (!empty($_POST['longlastingsession']))
 462         {
 463                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 464             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 465             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 466
 467             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 468             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 469             // Note: Never forget the trailing slash on the cookie path!
 470             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 471         }
 472         else // Standard session expiration (=when browser closes)
 473         {
 474             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 475             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 476             session_regenerate_id(true);
 477         }
 478
 479         // Optional redirect after login:
 480         if (isset($_GET['post'])) {
 481             $uri = '?post='. urlencode($_GET['post']);
 482             foreach (array('description', 'source', 'title') as $param) {
 483                 if (!empty($_GET[$param])) {
 484                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 485                 }
 486             }
 487             header('Location: '. $uri);
 488             exit;
 489         }
 490
 491         if (isset($_GET['edit_link'])) {
 492             header('Location: ?edit_link='. escape($_GET['edit_link']));
 493             exit;
 494         }
 495
 496         if (isset($_POST['returnurl'])) {
 497             // Prevent loops over login screen.
 498             if (strpos($_POST['returnurl'], 'do=login') === false) {
 499                 header('Location: '. escape($_POST['returnurl']));
 500                 exit;
 501             }
 502         }
 503         header('Location: ?'); exit;
 504     }
 505     else
 506     {
 507         ban_loginFailed();
 508         $redir = '';
 509         if (isset($_GET['post'])) {
 510             $redir = '?post=' . urlencode($_GET['post']);
 511             foreach (array('description', 'source', 'title') as $param) {
 512                 if (!empty($_GET[$param])) {
 513                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 514                 }
 515             }
 516         }
 517         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 518         exit;
 519     }
 520 }
 521
 522 // ------------------------------------------------------------------------------------------
 523 // Misc utility functions:
 524
 525 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 526 function return_bytes($val)
 527 {
 528     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 529     switch($last)
 530     {
 531         case 'g': $val *= 1024;
 532         case 'm': $val *= 1024;
 533         case 'k': $val *= 1024;
 534     }
 535     return $val;
 536 }
 537
 538 // Try to determine max file size for uploads (POST).
 539 // Returns an integer (in bytes)
 540 function getMaxFileSize()
 541 {
 542     $size1 = return_bytes(ini_get('post_max_size'));
 543     $size2 = return_bytes(ini_get('upload_max_filesize'));
 544     // Return the smaller of two:
 545     $maxsize = min($size1,$size2);
 546     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 547     return $maxsize;
 548 }
 549
 550 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 551     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 552     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 553 function linkdate2timestamp($linkdate)
 554 {
 555     if(strcmp($linkdate, '_000000') !== 0 || !$linkdate){
 556         $Y=$M=$D=$h=$m=$s=0;
 557         $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 558         return mktime($h,$m,$s,$M,$D,$Y);
 559     }
 560     return time();
 561 }
 562
 563 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 564     (used to build the pubDate attribute in RSS feed.)  */
 565 function linkdate2rfc822($linkdate)
 566 {
 567     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 568 }
 569
 570 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 571     (used to build the updated tags in ATOM feed.)  */
 572 function linkdate2iso8601($linkdate)
 573 {
 574     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 575 }
 576
 577 // ------------------------------------------------------------------------------------------
 578 // Token management for XSRF protection
 579 // Token should be used in any form which acts on data (create,update,delete,import...).
 580 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 581
 582 // Returns a token.
 583 function getToken()
 584 {
 585     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 586     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 587     return $rnd;
 588 }
 589
 590 // Tells if a token is OK. Using this function will destroy the token.
 591 // true=token is OK.
 592 function tokenOk($token)
 593 {
 594     if (isset($_SESSION['tokens'][$token]))
 595     {
 596         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 597         return true; // Token is OK.
 598     }
 599     return false; // Wrong token, or already used.
 600 }
 601
 602 // ------------------------------------------------------------------------------------------
 603 /* This class is in charge of building the final page.
 604    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 605    p = new pageBuilder;
 606    p.assign('myfield','myvalue');
 607    p.renderPage('mytemplate');
 608
 609 */
 610 class pageBuilder
 611 {
 612     private $tpl; // RainTPL template
 613
 614     function __construct()
 615     {
 616         $this->tpl = false;
 617     }
 618
 619     /**
 620      * Initialize all default tpl tags.
 621      */
 622     private function initialize()
 623     {
 624         $this->tpl = new RainTPL;
 625
 626         try {
 627             $version = ApplicationUtils::checkUpdate(
 628                 shaarli_version,
 629                 $GLOBALS['config']['UPDATECHECK_FILENAME'],
 630                 $GLOBALS['config']['UPDATECHECK_INTERVAL'],
 631                 $GLOBALS['config']['ENABLE_UPDATECHECK'],
 632                 isLoggedIn(),
 633                 $GLOBALS['config']['UPDATECHECK_BRANCH']
 634             );
 635             $this->tpl->assign('newVersion', escape($version));
 636             $this->tpl->assign('versionError', '');
 637
 638         } catch (Exception $exc) {
 639             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], $exc->getMessage());
 640             $this->tpl->assign('newVersion', '');
 641             $this->tpl->assign('versionError', escape($exc->getMessage()));
 642         }
 643
 644         $this->tpl->assign('feedurl', escape(index_url($_SERVER)));
 645         $searchcrits = ''; // Search criteria
 646         if (!empty($_GET['searchtags'])) {
 647             $searchcrits .= '&searchtags=' . urlencode($_GET['searchtags']);
 648         }
 649         elseif (!empty($_GET['searchterm'])) {
 650             $searchcrits .= '&searchterm=' . urlencode($_GET['searchterm']);
 651         }
 652         $this->tpl->assign('searchcrits', $searchcrits);
 653         $this->tpl->assign('source', index_url($_SERVER));
 654         $this->tpl->assign('version', shaarli_version);
 655         $this->tpl->assign('scripturl', index_url($_SERVER));
 656         $this->tpl->assign('pagetitle', 'Shaarli');
 657         $this->tpl->assign('privateonly', !empty($_SESSION['privateonly'])); // Show only private links?
 658         if (!empty($GLOBALS['title'])) {
 659             $this->tpl->assign('pagetitle', $GLOBALS['title']);
 660         }
 661         if (!empty($GLOBALS['titleLink'])) {
 662             $this->tpl->assign('titleLink', $GLOBALS['titleLink']);
 663         }
 664         if (!empty($GLOBALS['pagetitle'])) {
 665             $this->tpl->assign('pagetitle', $GLOBALS['pagetitle']);
 666         }
 667         $this->tpl->assign('shaarlititle', empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title']);
 668         if (!empty($GLOBALS['plugin_errors'])) {
 669             $this->tpl->assign('plugin_errors', $GLOBALS['plugin_errors']);
 670         }
 671     }
 672
 673     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 674     public function assign($what,$where)
 675     {
 676         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 677         $this->tpl->assign($what,$where);
 678     }
 679
 680     // Render a specific page (using a template).
 681     // e.g. pb.renderPage('picwall')
 682     public function renderPage($page)
 683     {
 684         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 685         $this->tpl->draw($page);
 686     }
 687
 688     /**
 689     * Render a 404 page (uses the template : tpl/404.tpl)
 690     *
 691     * usage : $PAGE->render404('The link was deleted')
 692     * @param string $message A messate to display what is not found
 693     */
 694     public function render404($message='The page you are trying to reach does not exist or has been deleted.') {
 695         header($_SERVER['SERVER_PROTOCOL'] . ' 404 Not Found');
 696         $this->tpl->assign('error_message', $message);
 697         $this->renderPage('404');
 698     }
 699 }
 700
 701 // ------------------------------------------------------------------------------------------
 702 // Output the last N links in RSS 2.0 format.
 703 function showRSS()
 704 {
 705     header('Content-Type: application/rss+xml; charset=utf-8');
 706
 707     // $usepermalink : If true, use permalink instead of final link.
 708     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=rss&permalinks
 709     // Also enabled through a config option
 710     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 711
 712     // Cache system
 713     $query = $_SERVER["QUERY_STRING"];
 714     $cache = new CachedPage(
 715         $GLOBALS['config']['PAGECACHE'],
 716         page_url($_SERVER),
 717         startsWith($query,'do=rss') && !isLoggedIn()
 718     );
 719     $cached = $cache->cachedVersion();
 720     if (! empty($cached)) {
 721         echo $cached;
 722         exit;
 723     }
 724
 725     // If cached was not found (or not usable), then read the database and build the response:
 726     $LINKSDB = new LinkDB(
 727         $GLOBALS['config']['DATASTORE'],
 728         isLoggedIn(),
 729         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 730         $GLOBALS['redirector']
 731     );
 732     // Read links from database (and filter private links if user it not logged in).
 733
 734     // Optionally filter the results:
 735     if (!empty($_GET['searchterm'])) {
 736         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
 737     }
 738     elseif (!empty($_GET['searchtags'])) {
 739         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
 740     }
 741     else {
 742         $linksToDisplay = $LINKSDB;
 743     }
 744
 745     $nblinksToDisplay = 50;  // Number of links to display.
 746     // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 747     if (!empty($_GET['nb'])) {
 748         $nblinksToDisplay = $_GET['nb'] == 'all' ? count($linksToDisplay) : max(intval($_GET['nb']), 1);
 749     }
 750
 751     $pageaddr = escape(index_url($_SERVER));
 752     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 753     echo '<channel><title>'.$GLOBALS['title'].'</title><link>'.$pageaddr.'</link>';
 754     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 755     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 756     {
 757         echo '<!-- PubSubHubbub Discovery -->';
 758         echo '<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 759         echo '<link rel="self" href="'.$pageaddr.'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 760         echo '<!-- End Of PubSubHubbub Discovery -->';
 761     }
 762     $i=0;
 763     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 764     while ($i<$nblinksToDisplay && $i<count($keys))
 765     {
 766         $link = $linksToDisplay[$keys[$i]];
 767         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 768         $rfc822date = linkdate2rfc822($link['linkdate']);
 769         $absurl = $link['url'];
 770         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 771         if ($usepermalinks===true)
 772             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 773         else
 774             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 775         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.escape($rfc822date)."</pubDate>\n";
 776         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 777         {
 778             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.$pageaddr.'">'.$tag.'</category>'."\n"; }
 779         }
 780
 781         // Add permalink in description
 782         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 783         // If user wants permalinks first, put the final link in description
 784         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 785         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 786         echo '<description><![CDATA['.
 787             format_description($link['description'], $GLOBALS['redirector']) .
 788             $descriptionlink . ']]></description>' . "\n</item>\n";
 789         $i++;
 790     }
 791     echo '</channel></rss><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 792
 793     $cache->cache(ob_get_contents());
 794     ob_end_flush();
 795     exit;
 796 }
 797
 798 // ------------------------------------------------------------------------------------------
 799 // Output the last N links in ATOM format.
 800 function showATOM()
 801 {
 802     header('Content-Type: application/atom+xml; charset=utf-8');
 803
 804     // $usepermalink : If true, use permalink instead of final link.
 805     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
 806     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 807
 808     // Cache system
 809     $query = $_SERVER["QUERY_STRING"];
 810     $cache = new CachedPage(
 811         $GLOBALS['config']['PAGECACHE'],
 812         page_url($_SERVER),
 813         startsWith($query,'do=atom') && !isLoggedIn()
 814     );
 815     $cached = $cache->cachedVersion();
 816     if (!empty($cached)) {
 817         echo $cached;
 818         exit;
 819     }
 820
 821     // If cached was not found (or not usable), then read the database and build the response:
 822     // Read links from database (and filter private links if used it not logged in).
 823     $LINKSDB = new LinkDB(
 824         $GLOBALS['config']['DATASTORE'],
 825         isLoggedIn(),
 826         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 827         $GLOBALS['redirector']
 828     );
 829
 830     // Optionally filter the results:
 831     if (!empty($_GET['searchterm'])) {
 832         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
 833     }
 834     else if (!empty($_GET['searchtags'])) {
 835         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
 836     }
 837     else {
 838         $linksToDisplay = $LINKSDB;
 839     }
 840
 841     $nblinksToDisplay = 50;  // Number of links to display.
 842     // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 843     if (!empty($_GET['nb'])) {
 844         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max(intval($_GET['nb']), 1);
 845     }
 846
 847     $pageaddr=escape(index_url($_SERVER));
 848     $latestDate = '';
 849     $entries='';
 850     $i=0;
 851     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 852     while ($i<$nblinksToDisplay && $i<count($keys))
 853     {
 854         $link = $linksToDisplay[$keys[$i]];
 855         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 856         $iso8601date = linkdate2iso8601($link['linkdate']);
 857         $latestDate = max($latestDate,$iso8601date);
 858         $absurl = $link['url'];
 859         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 860         $entries.='<entry><title>'.$link['title'].'</title>';
 861         if ($usepermalinks===true)
 862             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
 863         else
 864             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
 865         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.escape($iso8601date).'</updated>';
 866
 867         // Add permalink in description
 868         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 869         // If user wants permalinks first, put the final link in description
 870         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 871         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 872
 873         $entries .= '<content type="html"><![CDATA['.
 874             format_description($link['description'], $GLOBALS['redirector']) .
 875             $descriptionlink . "]]></content>\n";
 876         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
 877         {
 878             foreach(explode(' ',$link['tags']) as $tag)
 879                 { $entries.='<category scheme="'.$pageaddr.'" term="'.$tag.'" />'."\n"; }
 880         }
 881         $entries.="</entry>\n";
 882         $i++;
 883     }
 884     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
 885     $feed.='<title>'.$GLOBALS['title'].'</title>';
 886     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.escape($latestDate).'</updated>';
 887     $feed.='<link rel="self" href="'.escape(server_url($_SERVER).$_SERVER["REQUEST_URI"]).'" />';
 888     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 889     {
 890         $feed.='<!-- PubSubHubbub Discovery -->';
 891         $feed.='<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
 892         $feed.='<!-- End Of PubSubHubbub Discovery -->';
 893     }
 894     $feed.='<author><name>'.$pageaddr.'</name><uri>'.$pageaddr.'</uri></author>';
 895     $feed.='<id>'.$pageaddr.'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
 896     $feed.=$entries;
 897     $feed.='</feed><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 898     echo $feed;
 899
 900     $cache->cache(ob_get_contents());
 901     ob_end_flush();
 902     exit;
 903 }
 904
 905 // ------------------------------------------------------------------------------------------
 906 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 907 // Gives the last 7 days (which have links).
 908 // This RSS feed cannot be filtered.
 909 function showDailyRSS() {
 910     // Cache system
 911     $query = $_SERVER["QUERY_STRING"];
 912     $cache = new CachedPage(
 913         $GLOBALS['config']['PAGECACHE'],
 914         page_url($_SERVER),
 915         startsWith($query,'do=dailyrss') && !isLoggedIn()
 916     );
 917     $cached = $cache->cachedVersion();
 918     if (!empty($cached)) {
 919         echo $cached;
 920         exit;
 921     }
 922
 923     // If cached was not found (or not usable), then read the database and build the response:
 924     // Read links from database (and filter private links if used it not logged in).
 925     $LINKSDB = new LinkDB(
 926         $GLOBALS['config']['DATASTORE'],
 927         isLoggedIn(),
 928         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 929         $GLOBALS['redirector']
 930     );
 931
 932     /* Some Shaarlies may have very few links, so we need to look
 933        back in time (rsort()) until we have enough days ($nb_of_days).
 934     */
 935     $linkdates = array();
 936     foreach ($LINKSDB as $linkdate => $value) {
 937         $linkdates[] = $linkdate;
 938     }
 939     rsort($linkdates);
 940     $nb_of_days = 7; // We take 7 days.
 941     $today = Date('Ymd');
 942     $days = array();
 943
 944     foreach ($linkdates as $linkdate) {
 945         $day = substr($linkdate, 0, 8); // Extract day (without time)
 946         if (strcmp($day,$today) < 0) {
 947             if (empty($days[$day])) {
 948                 $days[$day] = array();
 949             }
 950             $days[$day][] = $linkdate;
 951         }
 952
 953         if (count($days) > $nb_of_days) {
 954             break; // Have we collected enough days?
 955         }
 956     }
 957
 958     // Build the RSS feed.
 959     header('Content-Type: application/rss+xml; charset=utf-8');
 960     $pageaddr = escape(index_url($_SERVER));
 961     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 962     echo '<channel>';
 963     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 964     echo '<link>'. $pageaddr .'</link>';
 965     echo '<description>Daily shared links</description>';
 966     echo '<language>en-en</language>';
 967     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 968
 969     // For each day.
 970     foreach ($days as $day => $linkdates) {
 971         $daydate = linkdate2timestamp($day.'_000000'); // Full text date
 972         $rfc822date = linkdate2rfc822($day.'_000000');
 973         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 974
 975         // Build the HTML body of this RSS entry.
 976         $html = '';
 977         $href = '';
 978         $links = array();
 979
 980         // We pre-format some fields for proper output.
 981         foreach ($linkdates as $linkdate) {
 982             $l = $LINKSDB[$linkdate];
 983             $l['formatedDescription'] = format_description($l['description'], $GLOBALS['redirector']);
 984             $l['thumbnail'] = thumbnail($l['url']);
 985             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
 986             if (startsWith($l['url'], '?')) {
 987                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 988             }
 989             $links[$linkdate] = $l;
 990         }
 991
 992         // Then build the HTML for this day:
 993         $tpl = new RainTPL;
 994         $tpl->assign('title', $GLOBALS['title']);
 995         $tpl->assign('daydate', $daydate);
 996         $tpl->assign('absurl', $absurl);
 997         $tpl->assign('links', $links);
 998         $tpl->assign('rfc822date', escape($rfc822date));
 999         $html = $tpl->draw('dailyrss', $return_string=true);
1000
1001         echo $html . PHP_EOL;
1002     }
1003     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
1004
1005     $cache->cache(ob_get_contents());
1006     ob_end_flush();
1007     exit;
1008 }
1009
1010 /**
1011  * Show the 'Daily' page.
1012  *
1013  * @param PageBuilder $pageBuilder Template engine wrapper.
1014  */
1015 function showDaily($pageBuilder)
1016 {
1017     $LINKSDB = new LinkDB(
1018         $GLOBALS['config']['DATASTORE'],
1019         isLoggedIn(),
1020         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1021         $GLOBALS['redirector']
1022     );
1023
1024     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
1025     if (isset($_GET['day'])) $day=$_GET['day'];
1026
1027     $days = $LINKSDB->days();
1028     $i = array_search($day,$days);
1029     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
1030     $previousday='';
1031     $nextday='';
1032     if ($i!==false)
1033     {
1034         if ($i>=1) $previousday=$days[$i-1];
1035         if ($i<count($days)-1) $nextday=$days[$i+1];
1036     }
1037
1038     try {
1039         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_DAY, $day);
1040     } catch (Exception $exc) {
1041         error_log($exc);
1042         $linksToDisplay = array();
1043     }
1044
1045     // We pre-format some fields for proper output.
1046     foreach($linksToDisplay as $key=>$link)
1047     {
1048
1049         $taglist = explode(' ',$link['tags']);
1050         uasort($taglist, 'strcasecmp');
1051         $linksToDisplay[$key]['taglist']=$taglist;
1052         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $GLOBALS['redirector']);
1053         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
1054         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
1055     }
1056
1057     /* We need to spread the articles on 3 columns.
1058        I did not want to use a JavaScript lib like http://masonry.desandro.com/
1059        so I manually spread entries with a simple method: I roughly evaluate the
1060        height of a div according to title and description length.
1061     */
1062     $columns=array(array(),array(),array()); // Entries to display, for each column.
1063     $fill=array(0,0,0);  // Rough estimate of columns fill.
1064     foreach($linksToDisplay as $key=>$link)
1065     {
1066         // Roughly estimate length of entry (by counting characters)
1067         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
1068         // Description: 836 characters gives roughly 342 pixel height.
1069         // This is not perfect, but it's usually OK.
1070         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
1071         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
1072         // Then put in column which is the less filled:
1073         $smallest=min($fill); // find smallest value in array.
1074         $index=array_search($smallest,$fill); // find index of this smallest value.
1075         array_push($columns[$index],$link); // Put entry in this column.
1076         $fill[$index]+=$length;
1077     }
1078
1079     $data = array(
1080         'linksToDisplay' => $linksToDisplay,
1081         'linkcount' => count($LINKSDB),
1082         'cols' => $columns,
1083         'day' => linkdate2timestamp($day.'_000000'),
1084         'previousday' => $previousday,
1085         'nextday' => $nextday,
1086     );
1087     $pluginManager = PluginManager::getInstance();
1088     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
1089
1090     foreach ($data as $key => $value) {
1091         $pageBuilder->assign($key, $value);
1092     }
1093
1094     $pageBuilder->renderPage('daily');
1095     exit;
1096 }
1097
1098 // Renders the linklist
1099 function showLinkList($PAGE, $LINKSDB) {
1100     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1101     $PAGE->renderPage('linklist');
1102 }
1103
1104
1105 // ------------------------------------------------------------------------------------------
1106 // Render HTML page (according to URL parameters and user rights)
1107 function renderPage()
1108 {
1109     $LINKSDB = new LinkDB(
1110         $GLOBALS['config']['DATASTORE'],
1111         isLoggedIn(),
1112         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1113         $GLOBALS['redirector']
1114     );
1115
1116     $updater = new Updater(
1117         read_updates_file($GLOBALS['config']['UPDATES_FILE']),
1118         $GLOBALS,
1119         $LINKSDB,
1120         isLoggedIn()
1121     );
1122     try {
1123         $newUpdates = $updater->update();
1124         if (! empty($newUpdates)) {
1125             write_updates_file(
1126                 $GLOBALS['config']['UPDATES_FILE'],
1127                 $updater->getDoneUpdates()
1128             );
1129         }
1130     }
1131     catch(Exception $e) {
1132         die($e->getMessage());
1133     }
1134
1135     $PAGE = new pageBuilder;
1136
1137     // Determine which page will be rendered.
1138     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
1139     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
1140
1141     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
1142     // Then assign generated data to RainTPL.
1143     $common_hooks = array(
1144         'header',
1145         'footer',
1146         'includes',
1147     );
1148     $pluginManager = PluginManager::getInstance();
1149     foreach($common_hooks as $name) {
1150         $plugin_data = array();
1151         $pluginManager->executeHooks('render_' . $name, $plugin_data,
1152             array(
1153                 'target' => $targetPage,
1154                 'loggedin' => isLoggedIn()
1155             )
1156         );
1157         $PAGE->assign('plugins_' . $name, $plugin_data);
1158     }
1159
1160     // -------- Display login form.
1161     if ($targetPage == Router::$PAGE_LOGIN)
1162     {
1163         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1164         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1165         $PAGE->assign('token',$token);
1166         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
1167         $PAGE->renderPage('loginform');
1168         exit;
1169     }
1170     // -------- User wants to logout.
1171     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1172     {
1173         invalidateCaches($GLOBALS['config']['PAGECACHE']);
1174         logout();
1175         header('Location: ?');
1176         exit;
1177     }
1178
1179     // -------- Picture wall
1180     if ($targetPage == Router::$PAGE_PICWALL)
1181     {
1182         // Optionally filter the results:
1183         if (!empty($_GET['searchterm'])) {
1184             $links = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
1185         }
1186         elseif (! empty($_GET['searchtags'])) {
1187             $links = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
1188         }
1189         else {
1190             $links = $LINKSDB;
1191         }
1192
1193         $linksToDisplay = array();
1194
1195         // Get only links which have a thumbnail.
1196         foreach($links as $link)
1197         {
1198             $permalink='?'.escape(smallhash($link['linkdate']));
1199             $thumb=lazyThumbnail($link['url'],$permalink);
1200             if ($thumb!='') // Only output links which have a thumbnail.
1201             {
1202                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1203                 $linksToDisplay[]=$link; // Add to array.
1204             }
1205         }
1206
1207         $data = array(
1208             'linkcount' => count($LINKSDB),
1209             'linksToDisplay' => $linksToDisplay,
1210         );
1211         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
1212
1213         foreach ($data as $key => $value) {
1214             $PAGE->assign($key, $value);
1215         }
1216
1217         $PAGE->renderPage('picwall');
1218         exit;
1219     }
1220
1221     // -------- Tag cloud
1222     if ($targetPage == Router::$PAGE_TAGCLOUD)
1223     {
1224         $tags= $LINKSDB->allTags();
1225
1226         // We sort tags alphabetically, then choose a font size according to count.
1227         // First, find max value.
1228         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1229         ksort($tags);
1230         $tagList=array();
1231         foreach($tags as $key=>$value)
1232         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1233         {
1234             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1235         }
1236
1237         $data = array(
1238             'linkcount' => count($LINKSDB),
1239             'tags' => $tagList,
1240         );
1241         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
1242
1243         foreach ($data as $key => $value) {
1244             $PAGE->assign($key, $value);
1245         }
1246
1247         $PAGE->renderPage('tagcloud');
1248         exit;
1249     }
1250
1251     // Daily page.
1252     if ($targetPage == Router::$PAGE_DAILY) {
1253         showDaily($PAGE);
1254     }
1255
1256     // Display openseach plugin (XML)
1257     if ($targetPage == Router::$PAGE_OPENSEARCH) {
1258         header('Content-Type: application/xml; charset=utf-8');
1259         $PAGE->assign('serverurl', index_url($_SERVER));
1260         $PAGE->renderPage('opensearch');
1261         exit;
1262     }
1263
1264     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1265     if (isset($_GET['addtag']))
1266     {
1267         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1268         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1269         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1270
1271         // Prevent redirection loop
1272         if (isset($params['addtag'])) {
1273             unset($params['addtag']);
1274         }
1275
1276         // Check if this tag is already in the search query and ignore it if it is.
1277         // Each tag is always separated by a space
1278         if (isset($params['searchtags'])) {
1279             $current_tags = explode(' ', $params['searchtags']);
1280         } else {
1281             $current_tags = array();
1282         }
1283         $addtag = true;
1284         foreach ($current_tags as $value) {
1285             if ($value === $_GET['addtag']) {
1286                 $addtag = false;
1287                 break;
1288             }
1289         }
1290         // Append the tag if necessary
1291         if (empty($params['searchtags'])) {
1292             $params['searchtags'] = trim($_GET['addtag']);
1293         }
1294         else if ($addtag) {
1295             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1296         }
1297
1298         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1299         header('Location: ?'.http_build_query($params));
1300         exit;
1301     }
1302
1303     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1304     if (isset($_GET['removetag'])) {
1305         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1306         if (empty($_SERVER['HTTP_REFERER'])) {
1307             header('Location: ?');
1308             exit;
1309         }
1310
1311         // In case browser does not send HTTP_REFERER
1312         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1313
1314         // Prevent redirection loop
1315         if (isset($params['removetag'])) {
1316             unset($params['removetag']);
1317         }
1318
1319         if (isset($params['searchtags'])) {
1320             $tags = explode(' ', $params['searchtags']);
1321             // Remove value from array $tags.
1322             $tags = array_diff($tags, array($_GET['removetag']));
1323             $params['searchtags'] = implode(' ',$tags);
1324
1325             if (empty($params['searchtags'])) {
1326                 unset($params['searchtags']);
1327             }
1328
1329             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1330         }
1331         header('Location: ?'.http_build_query($params));
1332         exit;
1333     }
1334
1335     // -------- User wants to change the number of links per page (linksperpage=...)
1336     if (isset($_GET['linksperpage'])) {
1337         if (is_numeric($_GET['linksperpage'])) {
1338             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1339         }
1340
1341         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1342         exit;
1343     }
1344
1345     // -------- User wants to see only private links (toggle)
1346     if (isset($_GET['privateonly'])) {
1347         if (empty($_SESSION['privateonly'])) {
1348             $_SESSION['privateonly'] = 1; // See only private links
1349         } else {
1350             unset($_SESSION['privateonly']); // See all links
1351         }
1352
1353         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1354         exit;
1355     }
1356
1357     // -------- Handle other actions allowed for non-logged in users:
1358     if (!isLoggedIn())
1359     {
1360         // User tries to post new link but is not logged in:
1361         // Show login screen, then redirect to ?post=...
1362         if (isset($_GET['post']))
1363         {
1364             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1365             exit;
1366         }
1367
1368                 // Same case as above except that user tried to access ?do=addlink without being logged in
1369                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1370                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1371                         header('Location: ?do=login&post=');
1372                         exit;
1373                 }
1374         showLinkList($PAGE, $LINKSDB);
1375         if (isset($_GET['edit_link'])) {
1376             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1377             exit;
1378         }
1379
1380         exit; // Never remove this one! All operations below are reserved for logged in user.
1381     }
1382
1383     // -------- All other functions are reserved for the registered user:
1384
1385     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1386     if ($targetPage == Router::$PAGE_TOOLS)
1387     {
1388         $data = array(
1389             'linkcount' => count($LINKSDB),
1390             'pageabsaddr' => index_url($_SERVER),
1391         );
1392         $pluginManager->executeHooks('render_tools', $data);
1393
1394         foreach ($data as $key => $value) {
1395             $PAGE->assign($key, $value);
1396         }
1397
1398         $PAGE->renderPage('tools');
1399         exit;
1400     }
1401
1402     // -------- User wants to change his/her password.
1403     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1404     {
1405         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1406         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1407         {
1408             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1409
1410             // Make sure old password is correct.
1411             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1412             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1413             // Save new password
1414             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1415             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1416             try {
1417                 writeConfig($GLOBALS, isLoggedIn());
1418             }
1419             catch(Exception $e) {
1420                 error_log(
1421                     'ERROR while writing config file after changing password.' . PHP_EOL .
1422                     $e->getMessage()
1423                 );
1424
1425                 // TODO: do not handle exceptions/errors in JS.
1426                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1427                 exit;
1428             }
1429             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1430             exit;
1431         }
1432         else // show the change password form.
1433         {
1434             $PAGE->assign('linkcount',count($LINKSDB));
1435             $PAGE->assign('token',getToken());
1436             $PAGE->renderPage('changepassword');
1437             exit;
1438         }
1439     }
1440
1441     // -------- User wants to change configuration
1442     if ($targetPage == Router::$PAGE_CONFIGURE)
1443     {
1444         if (!empty($_POST['title']) )
1445         {
1446             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1447             $tz = 'UTC';
1448             if (!empty($_POST['continent']) && !empty($_POST['city']))
1449                 if (isTimeZoneValid($_POST['continent'],$_POST['city']))
1450                     $tz = $_POST['continent'].'/'.$_POST['city'];
1451             $GLOBALS['timezone'] = $tz;
1452             $GLOBALS['title']=$_POST['title'];
1453             $GLOBALS['titleLink']=$_POST['titleLink'];
1454             $GLOBALS['redirector']=$_POST['redirector'];
1455             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1456             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1457             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1458             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1459             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1460             try {
1461                 writeConfig($GLOBALS, isLoggedIn());
1462             }
1463             catch(Exception $e) {
1464                 error_log(
1465                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1466                     $e->getMessage()
1467                 );
1468
1469                 // TODO: do not handle exceptions/errors in JS.
1470                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1471                 exit;
1472             }
1473             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1474             exit;
1475         }
1476         else // Show the configuration form.
1477         {
1478             $PAGE->assign('linkcount',count($LINKSDB));
1479             $PAGE->assign('token',getToken());
1480             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1481             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1482             list($timezone_form, $timezone_js) = generateTimeZoneForm($GLOBALS['timezone']);
1483             $PAGE->assign('timezone_form', $timezone_form);
1484             $PAGE->assign('timezone_js',$timezone_js);
1485             $PAGE->renderPage('configure');
1486             exit;
1487         }
1488     }
1489
1490     // -------- User wants to rename a tag or delete it
1491     if ($targetPage == Router::$PAGE_CHANGETAG)
1492     {
1493         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1494             $PAGE->assign('linkcount', count($LINKSDB));
1495             $PAGE->assign('token', getToken());
1496             $PAGE->assign('tags', $LINKSDB->allTags());
1497             $PAGE->renderPage('changetag');
1498             exit;
1499         }
1500
1501         if (!tokenOk($_POST['token'])) {
1502             die('Wrong token.');
1503         }
1504
1505         // Delete a tag:
1506         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1507             $needle=trim($_POST['fromtag']);
1508             // True for case-sensitive tag search.
1509             $linksToAlter = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $needle, true);
1510             foreach($linksToAlter as $key=>$value)
1511             {
1512                 $tags = explode(' ',trim($value['tags']));
1513                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1514                 $value['tags']=trim(implode(' ',$tags));
1515                 $LINKSDB[$key]=$value;
1516             }
1517             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1518             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1519             exit;
1520         }
1521
1522         // Rename a tag:
1523         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1524             $needle=trim($_POST['fromtag']);
1525             // True for case-sensitive tag search.
1526             $linksToAlter = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $needle, true);
1527             foreach($linksToAlter as $key=>$value)
1528             {
1529                 $tags = explode(' ',trim($value['tags']));
1530                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1531                 $value['tags']=trim(implode(' ',$tags));
1532                 $LINKSDB[$key]=$value;
1533             }
1534             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1535             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1536             exit;
1537         }
1538     }
1539
1540     // -------- User wants to add a link without using the bookmarklet: Show form.
1541     if ($targetPage == Router::$PAGE_ADDLINK)
1542     {
1543         $PAGE->assign('linkcount',count($LINKSDB));
1544         $PAGE->renderPage('addlink');
1545         exit;
1546     }
1547
1548     // -------- User clicked the "Save" button when editing a link: Save link to database.
1549     if (isset($_POST['save_edit']))
1550     {
1551         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1552         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1553         $tags = implode(' ', array_unique(explode(' ', $tags))); // Remove duplicates.
1554         $linkdate=$_POST['lf_linkdate'];
1555         $url = trim($_POST['lf_url']);
1556         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?') && !startsWith($url,'javascript:'))
1557             $url = 'http://'.$url;
1558         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1559                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1560         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1561
1562         $pluginManager->executeHooks('save_link', $link);
1563
1564         $LINKSDB[$linkdate] = $link;
1565         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1566         pubsubhub();
1567
1568         // If we are called from the bookmarklet, we must close the popup:
1569         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1570             echo '<script>self.close();</script>';
1571             exit;
1572         }
1573
1574         $returnurl = !empty($_POST['returnurl']) ? escape($_POST['returnurl']): '?';
1575         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1576         $location .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1577         header('Location: '. $location); // After saving the link, redirect to the page the user was on.
1578         exit;
1579     }
1580
1581     // -------- User clicked the "Cancel" button when editing a link.
1582     if (isset($_POST['cancel_edit']))
1583     {
1584         // If we are called from the bookmarklet, we must close the popup:
1585         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1586         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1587         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1588         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1589         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1590         exit;
1591     }
1592
1593     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1594     if (isset($_POST['delete_link']))
1595     {
1596         if (!tokenOk($_POST['token'])) die('Wrong token.');
1597         // We do not need to ask for confirmation:
1598         // - confirmation is handled by JavaScript
1599         // - we are protected from XSRF by the token.
1600         $linkdate=$_POST['lf_linkdate'];
1601
1602         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1603
1604         unset($LINKSDB[$linkdate]);
1605         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // save to disk
1606
1607         // If we are called from the bookmarklet, we must close the popup:
1608         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1609         // Pick where we're going to redirect
1610         // =============================================================
1611         // Basically, we can't redirect to where we were previously if it was a permalink
1612         // or an edit_link, because it would 404.
1613         // Cases:
1614         //    - /             : nothing in $_GET, redirect to self
1615         //    - /?page        : redirect to self
1616         //    - /?searchterm  : redirect to self (there might be other links)
1617         //    - /?searchtags  : redirect to self
1618         //    - /permalink    : redirect to / (the link does not exist anymore)
1619         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1620         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1621         // redirect is not satisfied, and only then redirect to /
1622         $location = "?";
1623         // Self redirection
1624         if (count($_GET) == 0
1625             || isset($_GET['page'])
1626             || isset($_GET['searchterm'])
1627             || isset($_GET['searchtags'])
1628         ) {
1629             if (isset($_POST['returnurl'])) {
1630                 $location = $_POST['returnurl']; // Handle redirects given by the form
1631             } else {
1632                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1633             }
1634         }
1635
1636         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1637         exit;
1638     }
1639
1640     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1641     if (isset($_GET['edit_link']))
1642     {
1643         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1644         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1645         $data = array(
1646             'linkcount' => count($LINKSDB),
1647             'link' => $link,
1648             'link_is_new' => false,
1649             'token' => getToken(),
1650             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1651             'tags' => $LINKSDB->allTags(),
1652         );
1653         $pluginManager->executeHooks('render_editlink', $data);
1654
1655         foreach ($data as $key => $value) {
1656             $PAGE->assign($key, $value);
1657         }
1658
1659         $PAGE->renderPage('editlink');
1660         exit;
1661     }
1662
1663     // -------- User want to post a new link: Display link edit form.
1664     if (isset($_GET['post'])) {
1665         $url = cleanup_url(escape($_GET['post']));
1666
1667         $link_is_new = false;
1668         // Check if URL is not already in database (in this case, we will edit the existing link)
1669         $link = $LINKSDB->getLinkFromUrl($url);
1670         if (!$link)
1671         {
1672             $link_is_new = true;
1673             $linkdate = strval(date('Ymd_His'));
1674             // Get title if it was provided in URL (by the bookmarklet).
1675             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1676             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1677             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1678             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1679             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1680             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1681             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1682                 // Short timeout to keep the application responsive
1683                 list($headers, $content) = get_http_response($url, 4);
1684                 if (strpos($headers[0], '200 OK') !== false) {
1685                     // Retrieve charset.
1686                     $charset = get_charset($headers, $content);
1687                     // Extract title.
1688                     $title = html_extract_title($content);
1689                     // Re-encode title in utf-8 if necessary.
1690                     if (! empty($title) && $charset != 'utf-8') {
1691                         $title = mb_convert_encoding($title, $charset, 'utf-8');
1692                     }
1693                 }
1694             }
1695
1696             if ($url == '') {
1697                 $url = '?' . smallHash($linkdate);
1698                 $title = 'Note: ';
1699             }
1700
1701             $link = array(
1702                 'linkdate' => $linkdate,
1703                 'title' => $title,
1704                 'url' => $url,
1705                 'description' => $description,
1706                 'tags' => $tags,
1707                 'private' => $private
1708             );
1709         }
1710
1711         $data = array(
1712             'linkcount' => count($LINKSDB),
1713             'link' => $link,
1714             'link_is_new' => $link_is_new,
1715             'token' => getToken(), // XSRF protection.
1716             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1717             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1718             'tags' => $LINKSDB->allTags(),
1719         );
1720         $pluginManager->executeHooks('render_editlink', $data);
1721
1722         foreach ($data as $key => $value) {
1723             $PAGE->assign($key, $value);
1724         }
1725
1726         $PAGE->renderPage('editlink');
1727         exit;
1728     }
1729
1730     // -------- Export as Netscape Bookmarks HTML file.
1731     if ($targetPage == Router::$PAGE_EXPORT)
1732     {
1733         if (empty($_GET['what']))
1734         {
1735             $PAGE->assign('linkcount',count($LINKSDB));
1736             $PAGE->renderPage('export');
1737             exit;
1738         }
1739         $exportWhat=$_GET['what'];
1740         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1741
1742         header('Content-Type: text/html; charset=utf-8');
1743         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1744         $currentdate=date('Y/m/d H:i:s');
1745         echo <<<HTML
1746 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1747 <!-- This is an automatically generated file.
1748      It will be read and overwritten.
1749      DO NOT EDIT! -->
1750 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1751 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1752 <TITLE>Bookmarks</TITLE>
1753 <H1>Bookmarks</H1>
1754 HTML;
1755         foreach($LINKSDB as $link)
1756         {
1757             if ($exportWhat=='all' ||
1758                ($exportWhat=='private' && $link['private']!=0) ||
1759                ($exportWhat=='public' && $link['private']==0))
1760             {
1761                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1762                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1763                 echo '>'.$link['title']."</A>\n";
1764                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1765             }
1766         }
1767                 exit;
1768     }
1769
1770     // -------- User is uploading a file for import
1771     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1772     {
1773         // If file is too big, some form field may be missing.
1774         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1775         {
1776             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1777             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1778             exit;
1779         }
1780         if (!tokenOk($_POST['token'])) die('Wrong token.');
1781         importFile();
1782         exit;
1783     }
1784
1785     // -------- Show upload/import dialog:
1786     if ($targetPage == Router::$PAGE_IMPORT)
1787     {
1788         $PAGE->assign('linkcount',count($LINKSDB));
1789         $PAGE->assign('token',getToken());
1790         $PAGE->assign('maxfilesize',getMaxFileSize());
1791         $PAGE->renderPage('import');
1792         exit;
1793     }
1794
1795     // Plugin administration page
1796     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1797         $pluginMeta = $pluginManager->getPluginsMeta();
1798
1799         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1800         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1801         // Load parameters.
1802         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $GLOBALS['plugins']);
1803         uasort(
1804             $enabledPlugins,
1805             function($a, $b) { return $a['order'] - $b['order']; }
1806         );
1807         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1808
1809         $PAGE->assign('enabledPlugins', $enabledPlugins);
1810         $PAGE->assign('disabledPlugins', $disabledPlugins);
1811         $PAGE->renderPage('pluginsadmin');
1812         exit;
1813     }
1814
1815     // Plugin administration form action
1816     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1817         try {
1818             if (isset($_POST['parameters_form'])) {
1819                 unset($_POST['parameters_form']);
1820                 foreach ($_POST as $param => $value) {
1821                     $GLOBALS['plugins'][$param] = escape($value);
1822                 }
1823             }
1824             else {
1825                 $GLOBALS['config']['ENABLED_PLUGINS'] = save_plugin_config($_POST);
1826             }
1827             writeConfig($GLOBALS, isLoggedIn());
1828         }
1829         catch (Exception $e) {
1830             error_log(
1831                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1832                 $e->getMessage()
1833             );
1834
1835             // TODO: do not handle exceptions/errors in JS.
1836             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=pluginsadmin\';</script>';
1837             exit;
1838         }
1839         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1840         exit;
1841     }
1842
1843     // -------- Otherwise, simply display search form and links:
1844     showLinkList($PAGE, $LINKSDB);
1845     exit;
1846 }
1847
1848 // -----------------------------------------------------------------------------------------------
1849 // Process the import file form.
1850 function importFile()
1851 {
1852     if (!isLoggedIn()) { die('Not allowed.'); }
1853     $LINKSDB = new LinkDB(
1854         $GLOBALS['config']['DATASTORE'],
1855         isLoggedIn(),
1856         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1857         $GLOBALS['redirector']
1858     );
1859     $filename=$_FILES['filetoupload']['name'];
1860     $filesize=$_FILES['filetoupload']['size'];
1861     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1862     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1863     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1864     $import_count=0;
1865
1866     // Sniff file type:
1867     $type='unknown';
1868     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1869
1870     // Then import the bookmarks.
1871     if ($type=='netscape')
1872     {
1873         // This is a standard Netscape-style bookmark file.
1874         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1875         foreach(explode('<DT>',$data) as $html) // explode is very fast
1876         {
1877             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1878             $d = explode('<DD>',$html);
1879             if (startswith($d[0],'<A '))
1880             {
1881                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1882                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1883                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1884                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1885                 $raw_add_date=0;
1886                 foreach($matches as $m)
1887                 {
1888                     $attr=$m[1]; $value=$m[2];
1889                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1890                     elseif ($attr=='ADD_DATE')
1891                     {
1892                         $raw_add_date=intval($value);
1893                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1894                     }
1895                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1896                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1897                 }
1898                 if ($link['url']!='')
1899                 {
1900                     if ($private==1) $link['private']=1;
1901                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1902                     if ($dblink==false)
1903                     {  // Link not in database, let's import it...
1904                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1905
1906                        // Make sure date/time is not already used by another link.
1907                        // (Some bookmark files have several different links with the same ADD_DATE)
1908                        // We increment date by 1 second until we find a date which is not used in DB.
1909                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1910                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1911                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1912                        $LINKSDB[$link['linkdate']] = $link;
1913                        $import_count++;
1914                     }
1915                     else // Link already present in database.
1916                     {
1917                         if ($overwrite)
1918                         {   // If overwrite is required, we import link data, except date/time.
1919                             $link['linkdate']=$dblink['linkdate'];
1920                             $LINKSDB[$link['linkdate']] = $link;
1921                             $import_count++;
1922                         }
1923                     }
1924
1925                 }
1926             }
1927         }
1928         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1929
1930         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1931     }
1932     else
1933     {
1934         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1935     }
1936 }
1937
1938 // -----------------------------------------------------------------------------------------------
1939 // Template for the list of links (<div id="linklist">)
1940 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1941 function buildLinkList($PAGE,$LINKSDB)
1942 {
1943     // ---- Filter link database according to parameters
1944     $search_type = '';
1945     $search_crits = '';
1946     $privateonly = !empty($_SESSION['privateonly']) ? true : false;
1947
1948     // Fulltext search
1949     if (isset($_GET['searchterm'])) {
1950         $search_crits = escape(trim($_GET['searchterm']));
1951         $search_type = LinkFilter::$FILTER_TEXT;
1952         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits, false, $privateonly);
1953     }
1954     // Search by tag
1955     elseif (isset($_GET['searchtags'])) {
1956         $search_crits = explode(' ', escape(trim($_GET['searchtags'])));
1957         $search_type = LinkFilter::$FILTER_TAG;
1958         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits, false, $privateonly);
1959     }
1960     // Detect smallHashes in URL.
1961     elseif (isset($_SERVER['QUERY_STRING'])
1962         && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/', $_SERVER['QUERY_STRING'])) {
1963         $search_type = LinkFilter::$FILTER_HASH;
1964         $search_crits = substr(trim($_SERVER["QUERY_STRING"], '/'), 0, 6);
1965         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits);
1966
1967         if (count($linksToDisplay) == 0) {
1968             $PAGE->render404('The link you are trying to reach does not exist or has been deleted.');
1969             exit;
1970         }
1971     }
1972     // Otherwise, display without filtering.
1973     else {
1974         $linksToDisplay = $LINKSDB->filter('', '', false, $privateonly);
1975     }
1976
1977     // ---- Handle paging.
1978     $keys = array();
1979     foreach ($linksToDisplay as $key => $value) {
1980         $keys[] = $key;
1981     }
1982
1983     // If there is only a single link, we change on-the-fly the title of the page.
1984     if (count($linksToDisplay) == 1) {
1985         $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1986     }
1987
1988     // Select articles according to paging.
1989     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1990     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1991     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1992     $page = $page < 1 ? 1 : $page;
1993     $page = $page > $pagecount ? $pagecount : $page;
1994     // Start index.
1995     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1996     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1997     $linkDisp = array();
1998     while ($i<$end && $i<count($keys))
1999     {
2000         $link = $linksToDisplay[$keys[$i]];
2001         $link['description'] = format_description($link['description'], $GLOBALS['redirector']);
2002         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
2003         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
2004         $link['timestamp'] = linkdate2timestamp($link['linkdate']);
2005         $taglist = explode(' ', $link['tags']);
2006         uasort($taglist, 'strcasecmp');
2007         $link['taglist'] = $taglist;
2008         $link['shorturl'] = smallHash($link['linkdate']);
2009         // Check for both signs of a note: starting with ? and 7 chars long.
2010         if ($link['url'][0] === '?' &&
2011             strlen($link['url']) === 7) {
2012             $link['url'] = index_url($_SERVER) . $link['url'];
2013         }
2014
2015         $linkDisp[$keys[$i]] = $link;
2016         $i++;
2017     }
2018
2019     // Compute paging navigation
2020     $searchterm = empty($_GET['searchterm']) ? '' : '&searchterm=' . $_GET['searchterm'];
2021     $searchtags = empty($_GET['searchtags']) ? '' : '&searchtags=' . $_GET['searchtags'];
2022     $previous_page_url = '';
2023     if ($i != count($keys)) {
2024         $previous_page_url = '?page=' . ($page+1) . $searchterm . $searchtags;
2025     }
2026     $next_page_url='';
2027     if ($page>1) {
2028         $next_page_url = '?page=' . ($page-1) . $searchterm . $searchtags;
2029     }
2030
2031     $token = '';
2032     if (isLoggedIn()) {
2033         $token = getToken();
2034     }
2035
2036     // Fill all template fields.
2037     $data = array(
2038         'linkcount' => count($LINKSDB),
2039         'previous_page_url' => $previous_page_url,
2040         'next_page_url' => $next_page_url,
2041         'page_current' => $page,
2042         'page_max' => $pagecount,
2043         'result_count' => count($linksToDisplay),
2044         'search_type' => $search_type,
2045         'search_crits' => $search_crits,
2046         'redirector' => empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'],  // Optional redirector URL.
2047         'token' => $token,
2048         'links' => $linkDisp,
2049         'tags' => $LINKSDB->allTags(),
2050     );
2051     // FIXME! temporary fix - see #399.
2052     if (!empty($GLOBALS['pagetitle']) && count($linkDisp) == 1) {
2053         $data['pagetitle'] = $GLOBALS['pagetitle'];
2054     }
2055
2056     $pluginManager = PluginManager::getInstance();
2057     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
2058
2059     foreach ($data as $key => $value) {
2060         $PAGE->assign($key, $value);
2061     }
2062
2063     return;
2064 }
2065
2066 // Compute the thumbnail for a link.
2067 //
2068 // With a link to the original URL.
2069 // Understands various services (youtube.com...)
2070 // Input: $url = URL for which the thumbnail must be found.
2071 //        $href = if provided, this URL will be followed instead of $url
2072 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
2073 // Some of them may be missing.
2074 // Return an empty array if no thumbnail available.
2075 function computeThumbnail($url,$href=false)
2076 {
2077     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
2078     if ($href==false) $href=$url;
2079
2080     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
2081     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
2082     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
2083     $domain = parse_url($url,PHP_URL_HOST);
2084     if ($domain=='youtube.com' || $domain=='www.youtube.com')
2085     {
2086         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
2087         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
2088                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2089     }
2090     if ($domain=='youtu.be') // Youtube short links
2091     {
2092         $path = parse_url($url,PHP_URL_PATH);
2093         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
2094                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2095     }
2096     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
2097     {
2098         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
2099         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
2100                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
2101     }
2102
2103     if ($domain=='imgur.com')
2104     {
2105         $path = parse_url($url,PHP_URL_PATH);
2106         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
2107         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
2108                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2109         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
2110                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2111
2112         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
2113                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2114     }
2115     if ($domain=='i.imgur.com')
2116     {
2117         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
2118         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
2119                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2120     }
2121     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
2122     {
2123         if (strpos($url,'dailymotion.com/video/')!==false)
2124         {
2125             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
2126             return array('src'=>$thumburl,
2127                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
2128         }
2129     }
2130     if (endsWith($domain,'.imageshack.us'))
2131     {
2132         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2133         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2134         {
2135             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
2136             return array('src'=>$thumburl,
2137                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
2138         }
2139     }
2140
2141     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
2142     // So we deport the thumbnail generation in order not to slow down page generation
2143     // (and we also cache the thumbnail)
2144
2145     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
2146
2147     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
2148         || $domain=='vimeo.com'
2149         || $domain=='ted.com' || endsWith($domain,'.ted.com')
2150         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
2151     )
2152     {
2153         if ($domain=='vimeo.com')
2154         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
2155             $path = parse_url($url,PHP_URL_PATH);
2156             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
2157         }
2158         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2159         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
2160             $path = parse_url($url,PHP_URL_PATH);
2161             if (!preg_match('!/\d+.+?!',$path)) return array();
2162         }
2163         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2164         {   // Make sure this TED URL points to a video (/talks/...)
2165             $path = parse_url($url,PHP_URL_PATH);
2166             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
2167         }
2168         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2169         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2170                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2171     }
2172
2173     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
2174     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
2175     // But using the extension will do.
2176     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2177     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2178     {
2179         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2180         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2181                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2182     }
2183     return array(); // No thumbnail.
2184
2185 }
2186
2187
2188 // Returns the HTML code to display a thumbnail for a link
2189 // with a link to the original URL.
2190 // Understands various services (youtube.com...)
2191 // Input: $url = URL for which the thumbnail must be found.
2192 //        $href = if provided, this URL will be followed instead of $url
2193 // Returns '' if no thumbnail available.
2194 function thumbnail($url,$href=false)
2195 {
2196     $t = computeThumbnail($url,$href);
2197     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2198
2199     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
2200     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2201     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2202     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2203     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2204     $html.='></a>';
2205     return $html;
2206 }
2207
2208 // Returns the HTML code to display a thumbnail for a link
2209 // for the picture wall (using lazy image loading)
2210 // Understands various services (youtube.com...)
2211 // Input: $url = URL for which the thumbnail must be found.
2212 //        $href = if provided, this URL will be followed instead of $url
2213 // Returns '' if no thumbnail available.
2214 function lazyThumbnail($url,$href=false)
2215 {
2216     $t = computeThumbnail($url,$href);
2217     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2218
2219     $html='<a href="'.escape($t['href']).'">';
2220
2221     // Lazy image
2222     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
2223
2224     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2225     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2226     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2227     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2228     $html.='>';
2229
2230     // No-JavaScript fallback.
2231     $html.='<noscript><img src="'.escape($t['src']).'"';
2232     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2233     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2234     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2235     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2236     $html.='></noscript></a>';
2237
2238     return $html;
2239 }
2240
2241
2242 // -----------------------------------------------------------------------------------------------
2243 // Installation
2244 // This function should NEVER be called if the file data/config.php exists.
2245 function install()
2246 {
2247     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2248     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2249
2250
2251     // This part makes sure sessions works correctly.
2252     // (Because on some hosts, session.save_path may not be set correctly,
2253     // or we may not have write access to it.)
2254     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2255     {   // Step 2: Check if data in session is correct.
2256         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2257         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2258         echo 'It currently points to '.session_save_path().'<br>';
2259         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2260         echo '<br><a href="?">Click to try again.</a></pre>';
2261         die;
2262     }
2263     if (!isset($_SESSION['session_tested']))
2264     {   // Step 1 : Try to store data in session and reload page.
2265         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2266         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
2267     }
2268     if (isset($_GET['test_session']))
2269     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2270         header('Location: '.index_url($_SERVER));
2271     }
2272
2273
2274     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2275     {
2276         $tz = 'UTC';
2277         if (!empty($_POST['continent']) && !empty($_POST['city'])) {
2278             if (isTimeZoneValid($_POST['continent'], $_POST['city'])) {
2279                 $tz = $_POST['continent'].'/'.$_POST['city'];
2280             }
2281         }
2282         $GLOBALS['timezone'] = $tz;
2283         // Everything is ok, let's create config file.
2284         $GLOBALS['login'] = $_POST['setlogin'];
2285         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2286         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2287         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(index_url($_SERVER)) : $_POST['title'] );
2288         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2289         try {
2290             writeConfig($GLOBALS, isLoggedIn());
2291         }
2292         catch(Exception $e) {
2293             error_log(
2294                     'ERROR while writing config file after installation.' . PHP_EOL .
2295                     $e->getMessage()
2296                 );
2297
2298             // TODO: do not handle exceptions/errors in JS.
2299             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2300             exit;
2301         }
2302         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2303         exit;
2304     }
2305
2306     // Display config form:
2307     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2308     $timezone_html = '';
2309     if ($timezone_form != '') {
2310         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2311     }
2312
2313     $PAGE = new pageBuilder;
2314     $PAGE->assign('timezone_html',$timezone_html);
2315     $PAGE->assign('timezone_js',$timezone_js);
2316     $PAGE->renderPage('install');
2317     exit;
2318 }
2319
2320 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2321    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2322    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2323    This function is called by passing the URL:
2324    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2325    [URL] is the URL of the link (e.g. a flickr page)
2326    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2327    The function below will fetch the image from the webservice and store it in the cache.
2328 */
2329 function genThumbnail()
2330 {
2331     // Make sure the parameters in the URL were generated by us.
2332     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2333     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2334
2335     // Let's see if we don't already have the image for this URL in the cache.
2336     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2337     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2338     {   // We have the thumbnail, just serve it:
2339         header('Content-Type: image/jpeg');
2340         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2341         return;
2342     }
2343     // We may also serve a blank image (if service did not respond)
2344     $blankname=hash('sha1',$_GET['url']).'.gif';
2345     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2346     {
2347         header('Content-Type: image/gif');
2348         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2349         return;
2350     }
2351
2352     // Otherwise, generate the thumbnail.
2353     $url = $_GET['url'];
2354     $domain = parse_url($url,PHP_URL_HOST);
2355
2356     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2357     {
2358         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2359         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2360
2361         // Is this a link to an image, or to a flickr page ?
2362         $imageurl='';
2363         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2364         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2365             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2366             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2367         }
2368         else // This is a flickr page (html)
2369         {
2370             // Get the flickr html page.
2371             list($headers, $content) = get_http_response($url, 20);
2372             if (strpos($headers[0], '200 OK') !== false)
2373             {
2374                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2375                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2376                 if (!empty($matches[1])) $imageurl=$matches[1];
2377
2378                 // In albums (and some other pages), the link rel="image_src" is not provided,
2379                 // but flickr provides:
2380                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2381                 if ($imageurl=='')
2382                 {
2383                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2384                     if (!empty($matches[1])) $imageurl=$matches[1];
2385                 }
2386             }
2387         }
2388
2389         if ($imageurl!='')
2390         {   // Let's download the image.
2391             // Image is 240x120, so 10 seconds to download should be enough.
2392             list($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=='vimeo.com' )
2404     {
2405         // This is more complex: we have to perform a HTTP request, then parse the result.
2406         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2407         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2408         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2409         if (strpos($headers[0], '200 OK') !== false) {
2410             $t = unserialize($content);
2411             $imageurl = $t[0]['thumbnail_medium'];
2412             // Then we download the image and serve it to our client.
2413             list($headers, $content) = get_http_response($imageurl, 10);
2414             if (strpos($headers[0], '200 OK') !== false) {
2415                 // Save image to cache.
2416                 file_put_contents($GLOBALS['config']['CACHEDIR'] . '/' . $thumbname, $content);
2417                 header('Content-Type: image/jpeg');
2418                 echo $content;
2419                 return;
2420             }
2421         }
2422     }
2423
2424     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2425     {
2426         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2427         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2428         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2429         list($headers, $content) = get_http_response($url, 5);
2430         if (strpos($headers[0], '200 OK') !== false) {
2431             // Extract the link to the thumbnail
2432             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2433             if (!empty($matches[1]))
2434             {   // Let's download the image.
2435                 $imageurl=$matches[1];
2436                 // No control on image size, so wait long enough
2437                 list($headers, $content) = get_http_response($imageurl, 20);
2438                 if (strpos($headers[0], '200 OK') !== false) {
2439                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2440                     file_put_contents($filepath, $content); // Save image to cache.
2441                     if (resizeImage($filepath))
2442                     {
2443                         header('Content-Type: image/jpeg');
2444                         echo file_get_contents($filepath);
2445                         return;
2446                     }
2447                 }
2448             }
2449         }
2450     }
2451
2452     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2453     {
2454         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2455         // http://xkcd.com/327/
2456         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2457         list($headers, $content) = get_http_response($url, 5);
2458         if (strpos($headers[0], '200 OK') !== false) {
2459             // Extract the link to the thumbnail
2460             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2461             if (!empty($matches[1]))
2462             {   // Let's download the image.
2463                 $imageurl=$matches[1];
2464                 // No control on image size, so wait long enough
2465                 list($headers, $content) = get_http_response($imageurl, 20);
2466                 if (strpos($headers[0], '200 OK') !== false) {
2467                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2468                     // Save image to cache.
2469                     file_put_contents($filepath, $content);
2470                     if (resizeImage($filepath))
2471                     {
2472                         header('Content-Type: image/jpeg');
2473                         echo file_get_contents($filepath);
2474                         return;
2475                     }
2476                 }
2477             }
2478         }
2479     }
2480
2481     else
2482     {
2483         // For all other domains, we try to download the image and make a thumbnail.
2484         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2485         list($headers, $content) = get_http_response($url, 30);
2486         if (strpos($headers[0], '200 OK') !== false) {
2487             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2488             // Save image to cache.
2489             file_put_contents($filepath, $content);
2490             if (resizeImage($filepath))
2491             {
2492                 header('Content-Type: image/jpeg');
2493                 echo file_get_contents($filepath);
2494                 return;
2495             }
2496         }
2497     }
2498
2499
2500     // Otherwise, return an empty image (8x8 transparent gif)
2501     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2502     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2503     header('Content-Type: image/gif');
2504     echo $blankgif;
2505 }
2506
2507 // Make a thumbnail of the image (to width: 120 pixels)
2508 // Returns true if success, false otherwise.
2509 function resizeImage($filepath)
2510 {
2511     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2512
2513     // Trick: some stupid people rename GIF as JPEG... or else.
2514     // So we really try to open each image type whatever the extension is.
2515     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2516     $im=false;
2517     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2518     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2519     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2520     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2521     $w = imagesx($im);
2522     $h = imagesy($im);
2523     $ystart = 0; $yheight=$h;
2524     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2525     $nw = 120;   // Desired width
2526     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2527     // Resize image:
2528     $im2 = imagecreatetruecolor($nw,$nh);
2529     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2530     imageinterlace($im2,true); // For progressive JPEG.
2531     $tempname=$filepath.'_TEMP.jpg';
2532     imagejpeg($im2, $tempname, 90);
2533     imagedestroy($im);
2534     imagedestroy($im2);
2535     unlink($filepath);
2536     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2537     return true;
2538 }
2539
2540 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2541 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2542 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2543 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2544 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2545 renderPage();
2546 ?>