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 // Set ENABLE_UPDATECHECK to disabled by default.
  57 $GLOBALS['config']['ENABLE_UPDATECHECK'] = false;
  58
  59 // RainTPL cache directory (keep the trailing slash!)
  60 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp/';
  61 // Raintpl template directory (keep the trailing slash!)
  62 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/';
  63
  64 // Thumbnail cache directory
  65 $GLOBALS['config']['CACHEDIR'] = 'cache';
  66
  67 // Atom & RSS feed cache directory
  68 $GLOBALS['config']['PAGECACHE'] = 'pagecache';
  69
  70 /*
  71  * Global configuration
  72  */
  73 // Ban IP after this many failures
  74 $GLOBALS['config']['BAN_AFTER'] = 4;
  75 // Ban duration for IP address after login failures (in seconds)
  76 $GLOBALS['config']['BAN_DURATION'] = 1800;
  77
  78 // Feed options
  79 // Enable RSS permalinks by default.
  80 // This corresponds to the default behavior of shaarli before this was added as an option.
  81 $GLOBALS['config']['ENABLE_RSS_PERMALINKS'] = true;
  82 // If true, an extra "ATOM feed" button will be displayed in the toolbar
  83 $GLOBALS['config']['SHOW_ATOM'] = false;
  84
  85 // Link display options
  86 $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = false;
  87 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false;
  88 $GLOBALS['config']['LINKS_PER_PAGE'] = 20;
  89
  90 // Open Shaarli (true): anyone can add/edit/delete links without having to login
  91 $GLOBALS['config']['OPEN_SHAARLI'] = false;
  92
  93 // Thumbnails
  94 // Display thumbnails in links
  95 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true;
  96 // Store thumbnails in a local cache
  97 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true;
  98
  99 // Update check frequency for Shaarli. 86400 seconds=24 hours
 100 $GLOBALS['config']['UPDATECHECK_BRANCH'] = 'stable';
 101 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400;
 102
 103
 104 /*
 105  * Plugin configuration
 106  *
 107  * Warning: order matters!
 108  *
 109  * These settings may be be overriden in:
 110  *  - data/config.php
 111  *  - each plugin's configuration file
 112  */
 113 //$GLOBALS['config']['ENABLED_PLUGINS'] = array(
 114 //    'qrcode', 'archiveorg', 'readityourself', 'demo_plugin', 'playvideos',
 115 //    'wallabag', 'markdown', 'addlink_toolbar',
 116 //);
 117 $GLOBALS['config']['ENABLED_PLUGINS'] = array('qrcode');
 118
 119 // Initialize plugin parameters array.
 120 $GLOBALS['plugins'] = array();
 121
 122 // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
 123 $GLOBALS['config']['PUBSUBHUB_URL'] = '';
 124
 125 /*
 126  * PHP configuration
 127  */
 128 define('shaarli_version', '0.6.3');
 129
 130 // http://server.com/x/shaarli --> /shaarli/
 131 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
 132
 133 // High execution time in case of problematic imports/exports.
 134 ini_set('max_input_time','60');
 135
 136 // Try to set max upload file size and read
 137 ini_set('memory_limit', '128M');
 138 ini_set('post_max_size', '16M');
 139 ini_set('upload_max_filesize', '16M');
 140
 141 // See all error except warnings
 142 error_reporting(E_ALL^E_WARNING);
 143 // See all errors (for debugging only)
 144 //error_reporting(-1);
 145
 146 /*
 147  * User configuration
 148  */
 149 if (is_file($GLOBALS['config']['CONFIG_FILE'])) {
 150     require_once $GLOBALS['config']['CONFIG_FILE'];
 151 }
 152
 153 // Shaarli library
 154 require_once 'application/ApplicationUtils.php';
 155 require_once 'application/Cache.php';
 156 require_once 'application/CachedPage.php';
 157 require_once 'application/FileUtils.php';
 158 require_once 'application/HttpUtils.php';
 159 require_once 'application/LinkDB.php';
 160 require_once 'application/LinkFilter.php';
 161 require_once 'application/LinkUtils.php';
 162 require_once 'application/TimeZone.php';
 163 require_once 'application/Url.php';
 164 require_once 'application/Utils.php';
 165 require_once 'application/Config.php';
 166 require_once 'application/PluginManager.php';
 167 require_once 'application/Router.php';
 168 require_once 'application/Updater.php';
 169
 170 // Ensure the PHP version is supported
 171 try {
 172     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
 173 } catch(Exception $exc) {
 174     header('Content-Type: text/plain; charset=utf-8');
 175     echo $exc->getMessage();
 176     exit;
 177 }
 178
 179 // Force cookie path (but do not change lifetime)
 180 $cookie = session_get_cookie_params();
 181 $cookiedir = '';
 182 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
 183     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
 184 }
 185 // Set default cookie expiration and path.
 186 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 187 // Set session parameters on server side.
 188 // If the user does not access any page within this time, his/her session is considered expired.
 189 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 190 // Use cookies to store session.
 191 ini_set('session.use_cookies', 1);
 192 // Force cookies for session (phpsessionID forbidden in URL).
 193 ini_set('session.use_only_cookies', 1);
 194 // Prevent PHP form using sessionID in URL if cookies are disabled.
 195 ini_set('session.use_trans_sid', false);
 196
 197 session_name('shaarli');
 198 // Start session if needed (Some server auto-start sessions).
 199 if (session_id() == '') {
 200     session_start();
 201 }
 202
 203 // Regenerate session ID if invalid or not defined in cookie.
 204 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 205     session_regenerate_id(true);
 206     $_COOKIE['shaarli'] = session_id();
 207 }
 208
 209 include "inc/rain.tpl.class.php"; //include Rain TPL
 210 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
 211 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
 212
 213 $pluginManager = PluginManager::getInstance();
 214 $pluginManager->load($GLOBALS['config']['ENABLED_PLUGINS']);
 215
 216 ob_start();  // Output buffering for the page cache.
 217
 218
 219 // In case stupid admin has left magic_quotes enabled in php.ini:
 220 if (get_magic_quotes_gpc())
 221 {
 222     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 223     $_POST = array_map('stripslashes_deep', $_POST);
 224     $_GET = array_map('stripslashes_deep', $_GET);
 225     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 226 }
 227
 228 // Prevent caching on client side or proxy: (yes, it's ugly)
 229 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 230 header("Cache-Control: no-store, no-cache, must-revalidate");
 231 header("Cache-Control: post-check=0, pre-check=0", false);
 232 header("Pragma: no-cache");
 233
 234 // Handling of old config file which do not have the new parameters.
 235 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(index_url($_SERVER));
 236 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 237 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 238 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 239 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 240 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 241 // I really need to rewrite Shaarli with a proper configuation manager.
 242
 243 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 244     // Ensure Shaarli has proper access to its resources
 245     $errors = ApplicationUtils::checkResourcePermissions($GLOBALS['config']);
 246
 247     if ($errors != array()) {
 248         $message = '<p>Insufficient permissions:</p><ul>';
 249
 250         foreach ($errors as $error) {
 251             $message .= '<li>'.$error.'</li>';
 252         }
 253         $message .= '</ul>';
 254
 255         header('Content-Type: text/html; charset=utf-8');
 256         echo $message;
 257         exit;
 258     }
 259
 260     // Display the installation form if no existing config is found
 261     install();
 262 }
 263
 264 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 265 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 266 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 267
 268 // a token depending of deployment salt, user password, and the current ip
 269 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 270
 271 autoLocale(); // Sniff browser language and set date format accordingly.
 272 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 273
 274 //==================================================================================================
 275 // Checking session state (i.e. is the user still logged in)
 276 //==================================================================================================
 277
 278 function setup_login_state() {
 279         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 280             return true;
 281         }
 282         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 283         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 284         if (!isset($GLOBALS['login'])) {
 285             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 286             $loginFailure = true;
 287         }
 288         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 289             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 290             !$loginFailure)
 291         {
 292             fillSessionInfo();
 293             $userIsLoggedIn = true;
 294         }
 295         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 296         if (empty($_SESSION['uid']) ||
 297             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 298             time() >= $_SESSION['expires_on'])
 299         {
 300             logout();
 301             $userIsLoggedIn = false;
 302             $loginFailure = true;
 303         }
 304         if (!empty($_SESSION['longlastingsession'])) {
 305             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 306         }
 307         else {
 308             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 309         }
 310         if (!$loginFailure) {
 311             $userIsLoggedIn = true;
 312         }
 313
 314         return $userIsLoggedIn;
 315 }
 316 $userIsLoggedIn = setup_login_state();
 317
 318
 319 // ------------------------------------------------------------------------------------------
 320 // Sniff browser language to display dates in the right format automatically.
 321 // (Note that is may not work on your server if the corresponding local is not installed.)
 322 function autoLocale()
 323 {
 324     $attempts = array('en_US'); // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 325     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 326     {   // (It's a bit crude, but it works very well. Preferred language is always presented first.)
 327         if (preg_match('/([a-z]{2})-?([a-z]{2})?/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) {
 328             $loc = $matches[1] . (!empty($matches[2]) ? '_' . strtoupper($matches[2]) : '');
 329             $attempts = array($loc.'.UTF-8', $loc, str_replace('_', '-', $loc).'.UTF-8', str_replace('_', '-', $loc),
 330                 $loc . '_' . strtoupper($loc).'.UTF-8', $loc . '_' . strtoupper($loc),
 331                 $loc . '_' . $loc.'.UTF-8', $loc . '_' . $loc, $loc . '-' . strtoupper($loc).'.UTF-8',
 332                 $loc . '-' . strtoupper($loc), $loc . '-' . $loc.'.UTF-8', $loc . '-' . $loc);
 333         }
 334     }
 335     setlocale(LC_TIME, $attempts);  // LC_TIME = Set local for date/time format only.
 336 }
 337
 338 // ------------------------------------------------------------------------------------------
 339 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 340 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 341 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 342 function pubsubhub()
 343 {
 344     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 345     {
 346        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 347        $topic_url = array (
 348                        index_url($_SERVER).'?do=atom',
 349                        index_url($_SERVER).'?do=rss'
 350                     );
 351        $p->publish_update($topic_url);
 352     }
 353 }
 354
 355 // ------------------------------------------------------------------------------------------
 356 // Session management
 357
 358 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 359 function allIPs()
 360 {
 361     $ip = $_SERVER["REMOTE_ADDR"];
 362     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 363     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 364     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 365     return $ip;
 366 }
 367
 368 function fillSessionInfo() {
 369         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 370         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 371         $_SESSION['username']=$GLOBALS['login'];
 372         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 373 }
 374
 375 // Check that user/password is correct.
 376 function check_auth($login,$password)
 377 {
 378     $hash = sha1($password.$login.$GLOBALS['salt']);
 379     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 380     {   // Login/password is correct.
 381                 fillSessionInfo();
 382         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login successful');
 383         return True;
 384     }
 385     logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login failed for user '.$login);
 386     return False;
 387 }
 388
 389 // Returns true if the user is logged in.
 390 function isLoggedIn()
 391 {
 392     global $userIsLoggedIn;
 393     return $userIsLoggedIn;
 394 }
 395
 396 // Force logout.
 397 function logout() {
 398     if (isset($_SESSION)) {
 399         unset($_SESSION['uid']);
 400         unset($_SESSION['ip']);
 401         unset($_SESSION['username']);
 402         unset($_SESSION['privateonly']);
 403     }
 404     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 405 }
 406
 407
 408 // ------------------------------------------------------------------------------------------
 409 // Brute force protection system
 410 // Several consecutive failed logins will ban the IP address for 30 minutes.
 411 if (!is_file($GLOBALS['config']['IPBANS_FILENAME'])) file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export(array('FAILURES'=>array(),'BANS'=>array()),true).";\n?>");
 412 include $GLOBALS['config']['IPBANS_FILENAME'];
 413 // Signal a failed login. Will ban the IP if too many failures:
 414 function ban_loginFailed()
 415 {
 416     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 417     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 418     $gb['FAILURES'][$ip]++;
 419     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 420     {
 421         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 422         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'IP address banned from login');
 423     }
 424     $GLOBALS['IPBANS'] = $gb;
 425     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 426 }
 427
 428 // Signals a successful login. Resets failed login counter.
 429 function ban_loginOk()
 430 {
 431     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 432     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 433     $GLOBALS['IPBANS'] = $gb;
 434     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 435 }
 436
 437 // Checks if the user CAN login. If 'true', the user can try to login.
 438 function ban_canLogin()
 439 {
 440     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 441     if (isset($gb['BANS'][$ip]))
 442     {
 443         // User is banned. Check if the ban has expired:
 444         if ($gb['BANS'][$ip]<=time())
 445         {   // Ban expired, user can try to login again.
 446             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Ban lifted.');
 447             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 448             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 449             return true; // Ban has expired, user can login.
 450         }
 451         return false; // User is banned.
 452     }
 453     return true; // User is not banned.
 454 }
 455
 456 // ------------------------------------------------------------------------------------------
 457 // Process login form: Check if login/password is correct.
 458 if (isset($_POST['login']))
 459 {
 460     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 461     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 462     {   // Login/password is OK.
 463         ban_loginOk();
 464         // If user wants to keep the session cookie even after the browser closes:
 465         if (!empty($_POST['longlastingsession']))
 466         {
 467                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 468             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 469             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 470
 471             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 472             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 473             // Note: Never forget the trailing slash on the cookie path!
 474             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 475         }
 476         else // Standard session expiration (=when browser closes)
 477         {
 478             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 479             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 480             session_regenerate_id(true);
 481         }
 482
 483         // Optional redirect after login:
 484         if (isset($_GET['post'])) {
 485             $uri = '?post='. urlencode($_GET['post']);
 486             foreach (array('description', 'source', 'title') as $param) {
 487                 if (!empty($_GET[$param])) {
 488                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 489                 }
 490             }
 491             header('Location: '. $uri);
 492             exit;
 493         }
 494
 495         if (isset($_GET['edit_link'])) {
 496             header('Location: ?edit_link='. escape($_GET['edit_link']));
 497             exit;
 498         }
 499
 500         if (isset($_POST['returnurl'])) {
 501             // Prevent loops over login screen.
 502             if (strpos($_POST['returnurl'], 'do=login') === false) {
 503                 header('Location: '. escape($_POST['returnurl']));
 504                 exit;
 505             }
 506         }
 507         header('Location: ?'); exit;
 508     }
 509     else
 510     {
 511         ban_loginFailed();
 512         $redir = '';
 513         if (isset($_GET['post'])) {
 514             $redir = '?post=' . urlencode($_GET['post']);
 515             foreach (array('description', 'source', 'title') as $param) {
 516                 if (!empty($_GET[$param])) {
 517                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 518                 }
 519             }
 520         }
 521         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 522         exit;
 523     }
 524 }
 525
 526 // ------------------------------------------------------------------------------------------
 527 // Misc utility functions:
 528
 529 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 530 function return_bytes($val)
 531 {
 532     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 533     switch($last)
 534     {
 535         case 'g': $val *= 1024;
 536         case 'm': $val *= 1024;
 537         case 'k': $val *= 1024;
 538     }
 539     return $val;
 540 }
 541
 542 // Try to determine max file size for uploads (POST).
 543 // Returns an integer (in bytes)
 544 function getMaxFileSize()
 545 {
 546     $size1 = return_bytes(ini_get('post_max_size'));
 547     $size2 = return_bytes(ini_get('upload_max_filesize'));
 548     // Return the smaller of two:
 549     $maxsize = min($size1,$size2);
 550     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 551     return $maxsize;
 552 }
 553
 554 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 555     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 556     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 557 function linkdate2timestamp($linkdate)
 558 {
 559     if(strcmp($linkdate, '_000000') !== 0 || !$linkdate){
 560         $Y=$M=$D=$h=$m=$s=0;
 561         $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 562         return mktime($h,$m,$s,$M,$D,$Y);
 563     }
 564     return time();
 565 }
 566
 567 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 568     (used to build the pubDate attribute in RSS feed.)  */
 569 function linkdate2rfc822($linkdate)
 570 {
 571     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 572 }
 573
 574 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 575     (used to build the updated tags in ATOM feed.)  */
 576 function linkdate2iso8601($linkdate)
 577 {
 578     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 579 }
 580
 581 // ------------------------------------------------------------------------------------------
 582 // Token management for XSRF protection
 583 // Token should be used in any form which acts on data (create,update,delete,import...).
 584 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 585
 586 // Returns a token.
 587 function getToken()
 588 {
 589     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 590     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 591     return $rnd;
 592 }
 593
 594 // Tells if a token is OK. Using this function will destroy the token.
 595 // true=token is OK.
 596 function tokenOk($token)
 597 {
 598     if (isset($_SESSION['tokens'][$token]))
 599     {
 600         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 601         return true; // Token is OK.
 602     }
 603     return false; // Wrong token, or already used.
 604 }
 605
 606 // ------------------------------------------------------------------------------------------
 607 /* This class is in charge of building the final page.
 608    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 609    p = new pageBuilder;
 610    p.assign('myfield','myvalue');
 611    p.renderPage('mytemplate');
 612
 613 */
 614 class pageBuilder
 615 {
 616     private $tpl; // RainTPL template
 617
 618     function __construct()
 619     {
 620         $this->tpl = false;
 621     }
 622
 623     /**
 624      * Initialize all default tpl tags.
 625      */
 626     private function initialize()
 627     {
 628         $this->tpl = new RainTPL;
 629
 630         try {
 631             $version = ApplicationUtils::checkUpdate(
 632                 shaarli_version,
 633                 $GLOBALS['config']['UPDATECHECK_FILENAME'],
 634                 $GLOBALS['config']['UPDATECHECK_INTERVAL'],
 635                 $GLOBALS['config']['ENABLE_UPDATECHECK'],
 636                 isLoggedIn(),
 637                 $GLOBALS['config']['UPDATECHECK_BRANCH']
 638             );
 639             $this->tpl->assign('newVersion', escape($version));
 640             $this->tpl->assign('versionError', '');
 641
 642         } catch (Exception $exc) {
 643             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], $exc->getMessage());
 644             $this->tpl->assign('newVersion', '');
 645             $this->tpl->assign('versionError', escape($exc->getMessage()));
 646         }
 647
 648         $this->tpl->assign('feedurl', escape(index_url($_SERVER)));
 649         $searchcrits = ''; // Search criteria
 650         if (!empty($_GET['searchtags'])) {
 651             $searchcrits .= '&searchtags=' . urlencode($_GET['searchtags']);
 652         }
 653         elseif (!empty($_GET['searchterm'])) {
 654             $searchcrits .= '&searchterm=' . urlencode($_GET['searchterm']);
 655         }
 656         $this->tpl->assign('searchcrits', $searchcrits);
 657         $this->tpl->assign('source', index_url($_SERVER));
 658         $this->tpl->assign('version', shaarli_version);
 659         $this->tpl->assign('scripturl', index_url($_SERVER));
 660         $this->tpl->assign('pagetitle', 'Shaarli');
 661         $this->tpl->assign('privateonly', !empty($_SESSION['privateonly'])); // Show only private links?
 662         if (!empty($GLOBALS['title'])) {
 663             $this->tpl->assign('pagetitle', $GLOBALS['title']);
 664         }
 665         if (!empty($GLOBALS['titleLink'])) {
 666             $this->tpl->assign('titleLink', $GLOBALS['titleLink']);
 667         }
 668         if (!empty($GLOBALS['pagetitle'])) {
 669             $this->tpl->assign('pagetitle', $GLOBALS['pagetitle']);
 670         }
 671         $this->tpl->assign('shaarlititle', empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title']);
 672         if (!empty($GLOBALS['plugin_errors'])) {
 673             $this->tpl->assign('plugin_errors', $GLOBALS['plugin_errors']);
 674         }
 675     }
 676
 677     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 678     public function assign($what,$where)
 679     {
 680         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 681         $this->tpl->assign($what,$where);
 682     }
 683
 684     // Render a specific page (using a template).
 685     // e.g. pb.renderPage('picwall')
 686     public function renderPage($page)
 687     {
 688         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 689         $this->tpl->draw($page);
 690     }
 691
 692     /**
 693     * Render a 404 page (uses the template : tpl/404.tpl)
 694     *
 695     * usage : $PAGE->render404('The link was deleted')
 696     * @param string $message A messate to display what is not found
 697     */
 698     public function render404($message='The page you are trying to reach does not exist or has been deleted.') {
 699         header($_SERVER['SERVER_PROTOCOL'] . ' 404 Not Found');
 700         $this->tpl->assign('error_message', $message);
 701         $this->renderPage('404');
 702     }
 703 }
 704
 705 // ------------------------------------------------------------------------------------------
 706 // Output the last N links in RSS 2.0 format.
 707 function showRSS()
 708 {
 709     header('Content-Type: application/rss+xml; charset=utf-8');
 710
 711     // $usepermalink : If true, use permalink instead of final link.
 712     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=rss&permalinks
 713     // Also enabled through a config option
 714     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 715
 716     // Cache system
 717     $query = $_SERVER["QUERY_STRING"];
 718     $cache = new CachedPage(
 719         $GLOBALS['config']['PAGECACHE'],
 720         page_url($_SERVER),
 721         startsWith($query,'do=rss') && !isLoggedIn()
 722     );
 723     $cached = $cache->cachedVersion();
 724     if (! empty($cached)) {
 725         echo $cached;
 726         exit;
 727     }
 728
 729     // If cached was not found (or not usable), then read the database and build the response:
 730     $LINKSDB = new LinkDB(
 731         $GLOBALS['config']['DATASTORE'],
 732         isLoggedIn(),
 733         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 734         $GLOBALS['redirector']
 735     );
 736     // Read links from database (and filter private links if user it not logged in).
 737
 738     // Optionally filter the results:
 739     if (!empty($_GET['searchterm'])) {
 740         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
 741     }
 742     elseif (!empty($_GET['searchtags'])) {
 743         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
 744     }
 745     else {
 746         $linksToDisplay = $LINKSDB;
 747     }
 748
 749     $nblinksToDisplay = 50;  // Number of links to display.
 750     // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 751     if (!empty($_GET['nb'])) {
 752         $nblinksToDisplay = $_GET['nb'] == 'all' ? count($linksToDisplay) : max(intval($_GET['nb']), 1);
 753     }
 754
 755     $pageaddr = escape(index_url($_SERVER));
 756     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 757     echo '<channel><title>'.$GLOBALS['title'].'</title><link>'.$pageaddr.'</link>';
 758     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 759     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 760     {
 761         echo '<!-- PubSubHubbub Discovery -->';
 762         echo '<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 763         echo '<link rel="self" href="'.$pageaddr.'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 764         echo '<!-- End Of PubSubHubbub Discovery -->';
 765     }
 766     $i=0;
 767     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 768     while ($i<$nblinksToDisplay && $i<count($keys))
 769     {
 770         $link = $linksToDisplay[$keys[$i]];
 771         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 772         $rfc822date = linkdate2rfc822($link['linkdate']);
 773         $absurl = $link['url'];
 774         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 775         if ($usepermalinks===true)
 776             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 777         else
 778             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 779         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.escape($rfc822date)."</pubDate>\n";
 780         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 781         {
 782             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.$pageaddr.'">'.$tag.'</category>'."\n"; }
 783         }
 784
 785         // Add permalink in description
 786         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 787         // If user wants permalinks first, put the final link in description
 788         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 789         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 790         echo '<description><![CDATA['.
 791             format_description($link['description'], $GLOBALS['redirector']) .
 792             $descriptionlink . ']]></description>' . "\n</item>\n";
 793         $i++;
 794     }
 795     echo '</channel></rss><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 796
 797     $cache->cache(ob_get_contents());
 798     ob_end_flush();
 799     exit;
 800 }
 801
 802 // ------------------------------------------------------------------------------------------
 803 // Output the last N links in ATOM format.
 804 function showATOM()
 805 {
 806     header('Content-Type: application/atom+xml; charset=utf-8');
 807
 808     // $usepermalink : If true, use permalink instead of final link.
 809     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
 810     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 811
 812     // Cache system
 813     $query = $_SERVER["QUERY_STRING"];
 814     $cache = new CachedPage(
 815         $GLOBALS['config']['PAGECACHE'],
 816         page_url($_SERVER),
 817         startsWith($query,'do=atom') && !isLoggedIn()
 818     );
 819     $cached = $cache->cachedVersion();
 820     if (!empty($cached)) {
 821         echo $cached;
 822         exit;
 823     }
 824
 825     // If cached was not found (or not usable), then read the database and build the response:
 826     // Read links from database (and filter private links if used it not logged in).
 827     $LINKSDB = new LinkDB(
 828         $GLOBALS['config']['DATASTORE'],
 829         isLoggedIn(),
 830         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 831         $GLOBALS['redirector']
 832     );
 833
 834     // Optionally filter the results:
 835     if (!empty($_GET['searchterm'])) {
 836         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
 837     }
 838     else if (!empty($_GET['searchtags'])) {
 839         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
 840     }
 841     else {
 842         $linksToDisplay = $LINKSDB;
 843     }
 844
 845     $nblinksToDisplay = 50;  // Number of links to display.
 846     // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 847     if (!empty($_GET['nb'])) {
 848         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max(intval($_GET['nb']), 1);
 849     }
 850
 851     $pageaddr=escape(index_url($_SERVER));
 852     $latestDate = '';
 853     $entries='';
 854     $i=0;
 855     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 856     while ($i<$nblinksToDisplay && $i<count($keys))
 857     {
 858         $link = $linksToDisplay[$keys[$i]];
 859         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 860         $iso8601date = linkdate2iso8601($link['linkdate']);
 861         $latestDate = max($latestDate,$iso8601date);
 862         $absurl = $link['url'];
 863         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 864         $entries.='<entry><title>'.$link['title'].'</title>';
 865         if ($usepermalinks===true)
 866             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
 867         else
 868             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
 869         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.escape($iso8601date).'</updated>';
 870
 871         // Add permalink in description
 872         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 873         // If user wants permalinks first, put the final link in description
 874         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 875         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 876
 877         $entries .= '<content type="html"><![CDATA['.
 878             format_description($link['description'], $GLOBALS['redirector']) .
 879             $descriptionlink . "]]></content>\n";
 880         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
 881         {
 882             foreach(explode(' ',$link['tags']) as $tag)
 883                 { $entries.='<category scheme="'.$pageaddr.'" term="'.$tag.'" />'."\n"; }
 884         }
 885         $entries.="</entry>\n";
 886         $i++;
 887     }
 888     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
 889     $feed.='<title>'.$GLOBALS['title'].'</title>';
 890     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.escape($latestDate).'</updated>';
 891     $feed.='<link rel="self" href="'.escape(server_url($_SERVER).$_SERVER["REQUEST_URI"]).'" />';
 892     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 893     {
 894         $feed.='<!-- PubSubHubbub Discovery -->';
 895         $feed.='<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
 896         $feed.='<!-- End Of PubSubHubbub Discovery -->';
 897     }
 898     $feed.='<author><name>'.$pageaddr.'</name><uri>'.$pageaddr.'</uri></author>';
 899     $feed.='<id>'.$pageaddr.'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
 900     $feed.=$entries;
 901     $feed.='</feed><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 902     echo $feed;
 903
 904     $cache->cache(ob_get_contents());
 905     ob_end_flush();
 906     exit;
 907 }
 908
 909 // ------------------------------------------------------------------------------------------
 910 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 911 // Gives the last 7 days (which have links).
 912 // This RSS feed cannot be filtered.
 913 function showDailyRSS() {
 914     // Cache system
 915     $query = $_SERVER["QUERY_STRING"];
 916     $cache = new CachedPage(
 917         $GLOBALS['config']['PAGECACHE'],
 918         page_url($_SERVER),
 919         startsWith($query,'do=dailyrss') && !isLoggedIn()
 920     );
 921     $cached = $cache->cachedVersion();
 922     if (!empty($cached)) {
 923         echo $cached;
 924         exit;
 925     }
 926
 927     // If cached was not found (or not usable), then read the database and build the response:
 928     // Read links from database (and filter private links if used it not logged in).
 929     $LINKSDB = new LinkDB(
 930         $GLOBALS['config']['DATASTORE'],
 931         isLoggedIn(),
 932         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 933         $GLOBALS['redirector']
 934     );
 935
 936     /* Some Shaarlies may have very few links, so we need to look
 937        back in time (rsort()) until we have enough days ($nb_of_days).
 938     */
 939     $linkdates = array();
 940     foreach ($LINKSDB as $linkdate => $value) {
 941         $linkdates[] = $linkdate;
 942     }
 943     rsort($linkdates);
 944     $nb_of_days = 7; // We take 7 days.
 945     $today = Date('Ymd');
 946     $days = array();
 947
 948     foreach ($linkdates as $linkdate) {
 949         $day = substr($linkdate, 0, 8); // Extract day (without time)
 950         if (strcmp($day,$today) < 0) {
 951             if (empty($days[$day])) {
 952                 $days[$day] = array();
 953             }
 954             $days[$day][] = $linkdate;
 955         }
 956
 957         if (count($days) > $nb_of_days) {
 958             break; // Have we collected enough days?
 959         }
 960     }
 961
 962     // Build the RSS feed.
 963     header('Content-Type: application/rss+xml; charset=utf-8');
 964     $pageaddr = escape(index_url($_SERVER));
 965     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 966     echo '<channel>';
 967     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 968     echo '<link>'. $pageaddr .'</link>';
 969     echo '<description>Daily shared links</description>';
 970     echo '<language>en-en</language>';
 971     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 972
 973     // For each day.
 974     foreach ($days as $day => $linkdates) {
 975         $daydate = linkdate2timestamp($day.'_000000'); // Full text date
 976         $rfc822date = linkdate2rfc822($day.'_000000');
 977         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 978
 979         // Build the HTML body of this RSS entry.
 980         $html = '';
 981         $href = '';
 982         $links = array();
 983
 984         // We pre-format some fields for proper output.
 985         foreach ($linkdates as $linkdate) {
 986             $l = $LINKSDB[$linkdate];
 987             $l['formatedDescription'] = format_description($l['description'], $GLOBALS['redirector']);
 988             $l['thumbnail'] = thumbnail($l['url']);
 989             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
 990             if (startsWith($l['url'], '?')) {
 991                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 992             }
 993             $links[$linkdate] = $l;
 994         }
 995
 996         // Then build the HTML for this day:
 997         $tpl = new RainTPL;
 998         $tpl->assign('title', $GLOBALS['title']);
 999         $tpl->assign('daydate', $daydate);
1000         $tpl->assign('absurl', $absurl);
1001         $tpl->assign('links', $links);
1002         $tpl->assign('rfc822date', escape($rfc822date));
1003         $html = $tpl->draw('dailyrss', $return_string=true);
1004
1005         echo $html . PHP_EOL;
1006     }
1007     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
1008
1009     $cache->cache(ob_get_contents());
1010     ob_end_flush();
1011     exit;
1012 }
1013
1014 /**
1015  * Show the 'Daily' page.
1016  *
1017  * @param PageBuilder $pageBuilder Template engine wrapper.
1018  */
1019 function showDaily($pageBuilder)
1020 {
1021     $LINKSDB = new LinkDB(
1022         $GLOBALS['config']['DATASTORE'],
1023         isLoggedIn(),
1024         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1025         $GLOBALS['redirector']
1026     );
1027
1028     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
1029     if (isset($_GET['day'])) $day=$_GET['day'];
1030
1031     $days = $LINKSDB->days();
1032     $i = array_search($day,$days);
1033     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
1034     $previousday='';
1035     $nextday='';
1036     if ($i!==false)
1037     {
1038         if ($i>=1) $previousday=$days[$i-1];
1039         if ($i<count($days)-1) $nextday=$days[$i+1];
1040     }
1041
1042     try {
1043         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_DAY, $day);
1044     } catch (Exception $exc) {
1045         error_log($exc);
1046         $linksToDisplay = array();
1047     }
1048
1049     // We pre-format some fields for proper output.
1050     foreach($linksToDisplay as $key=>$link)
1051     {
1052
1053         $taglist = explode(' ',$link['tags']);
1054         uasort($taglist, 'strcasecmp');
1055         $linksToDisplay[$key]['taglist']=$taglist;
1056         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $GLOBALS['redirector']);
1057         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
1058         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
1059     }
1060
1061     /* We need to spread the articles on 3 columns.
1062        I did not want to use a JavaScript lib like http://masonry.desandro.com/
1063        so I manually spread entries with a simple method: I roughly evaluate the
1064        height of a div according to title and description length.
1065     */
1066     $columns=array(array(),array(),array()); // Entries to display, for each column.
1067     $fill=array(0,0,0);  // Rough estimate of columns fill.
1068     foreach($linksToDisplay as $key=>$link)
1069     {
1070         // Roughly estimate length of entry (by counting characters)
1071         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
1072         // Description: 836 characters gives roughly 342 pixel height.
1073         // This is not perfect, but it's usually OK.
1074         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
1075         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
1076         // Then put in column which is the less filled:
1077         $smallest=min($fill); // find smallest value in array.
1078         $index=array_search($smallest,$fill); // find index of this smallest value.
1079         array_push($columns[$index],$link); // Put entry in this column.
1080         $fill[$index]+=$length;
1081     }
1082
1083     $data = array(
1084         'linksToDisplay' => $linksToDisplay,
1085         'linkcount' => count($LINKSDB),
1086         'cols' => $columns,
1087         'day' => linkdate2timestamp($day.'_000000'),
1088         'previousday' => $previousday,
1089         'nextday' => $nextday,
1090     );
1091     $pluginManager = PluginManager::getInstance();
1092     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
1093
1094     foreach ($data as $key => $value) {
1095         $pageBuilder->assign($key, $value);
1096     }
1097
1098     $pageBuilder->renderPage('daily');
1099     exit;
1100 }
1101
1102 // Renders the linklist
1103 function showLinkList($PAGE, $LINKSDB) {
1104     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1105     $PAGE->renderPage('linklist');
1106 }
1107
1108
1109 // ------------------------------------------------------------------------------------------
1110 // Render HTML page (according to URL parameters and user rights)
1111 function renderPage()
1112 {
1113     $LINKSDB = new LinkDB(
1114         $GLOBALS['config']['DATASTORE'],
1115         isLoggedIn(),
1116         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1117         $GLOBALS['redirector']
1118     );
1119
1120     $updater = new Updater(
1121         read_updates_file($GLOBALS['config']['UPDATES_FILE']),
1122         $GLOBALS,
1123         $LINKSDB,
1124         isLoggedIn()
1125     );
1126     try {
1127         $newUpdates = $updater->update();
1128         if (! empty($newUpdates)) {
1129             write_updates_file(
1130                 $GLOBALS['config']['UPDATES_FILE'],
1131                 $updater->getDoneUpdates()
1132             );
1133         }
1134     }
1135     catch(Exception $e) {
1136         die($e->getMessage());
1137     }
1138
1139     $PAGE = new pageBuilder;
1140
1141     // Determine which page will be rendered.
1142     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
1143     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
1144
1145     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
1146     // Then assign generated data to RainTPL.
1147     $common_hooks = array(
1148         'includes',
1149         'header',
1150         'footer',
1151     );
1152     $pluginManager = PluginManager::getInstance();
1153     foreach($common_hooks as $name) {
1154         $plugin_data = array();
1155         $pluginManager->executeHooks('render_' . $name, $plugin_data,
1156             array(
1157                 'target' => $targetPage,
1158                 'loggedin' => isLoggedIn()
1159             )
1160         );
1161         $PAGE->assign('plugins_' . $name, $plugin_data);
1162     }
1163
1164     // -------- Display login form.
1165     if ($targetPage == Router::$PAGE_LOGIN)
1166     {
1167         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1168         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1169         $PAGE->assign('token',$token);
1170         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
1171         $PAGE->renderPage('loginform');
1172         exit;
1173     }
1174     // -------- User wants to logout.
1175     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1176     {
1177         invalidateCaches($GLOBALS['config']['PAGECACHE']);
1178         logout();
1179         header('Location: ?');
1180         exit;
1181     }
1182
1183     // -------- Picture wall
1184     if ($targetPage == Router::$PAGE_PICWALL)
1185     {
1186         // Optionally filter the results:
1187         if (!empty($_GET['searchterm'])) {
1188             $links = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
1189         }
1190         elseif (! empty($_GET['searchtags'])) {
1191             $links = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
1192         }
1193         else {
1194             $links = $LINKSDB;
1195         }
1196
1197         $linksToDisplay = array();
1198
1199         // Get only links which have a thumbnail.
1200         foreach($links as $link)
1201         {
1202             $permalink='?'.escape(smallhash($link['linkdate']));
1203             $thumb=lazyThumbnail($link['url'],$permalink);
1204             if ($thumb!='') // Only output links which have a thumbnail.
1205             {
1206                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1207                 $linksToDisplay[]=$link; // Add to array.
1208             }
1209         }
1210
1211         $data = array(
1212             'linkcount' => count($LINKSDB),
1213             'linksToDisplay' => $linksToDisplay,
1214         );
1215         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
1216
1217         foreach ($data as $key => $value) {
1218             $PAGE->assign($key, $value);
1219         }
1220
1221         $PAGE->renderPage('picwall');
1222         exit;
1223     }
1224
1225     // -------- Tag cloud
1226     if ($targetPage == Router::$PAGE_TAGCLOUD)
1227     {
1228         $tags= $LINKSDB->allTags();
1229
1230         // We sort tags alphabetically, then choose a font size according to count.
1231         // First, find max value.
1232         $maxcount=0; foreach($tags as $key=>$value) $maxcount=max($maxcount,$value);
1233         ksort($tags);
1234         $tagList=array();
1235         foreach($tags as $key=>$value)
1236         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1237         {
1238             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1239         }
1240
1241         $data = array(
1242             'linkcount' => count($LINKSDB),
1243             'tags' => $tagList,
1244         );
1245         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
1246
1247         foreach ($data as $key => $value) {
1248             $PAGE->assign($key, $value);
1249         }
1250
1251         $PAGE->renderPage('tagcloud');
1252         exit;
1253     }
1254
1255     // Daily page.
1256     if ($targetPage == Router::$PAGE_DAILY) {
1257         showDaily($PAGE);
1258     }
1259
1260     // Display openseach plugin (XML)
1261     if ($targetPage == Router::$PAGE_OPENSEARCH) {
1262         header('Content-Type: application/xml; charset=utf-8');
1263         $PAGE->assign('serverurl', index_url($_SERVER));
1264         $PAGE->renderPage('opensearch');
1265         exit;
1266     }
1267
1268     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1269     if (isset($_GET['addtag']))
1270     {
1271         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1272         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1273         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1274
1275         // Prevent redirection loop
1276         if (isset($params['addtag'])) {
1277             unset($params['addtag']);
1278         }
1279
1280         // Check if this tag is already in the search query and ignore it if it is.
1281         // Each tag is always separated by a space
1282         if (isset($params['searchtags'])) {
1283             $current_tags = explode(' ', $params['searchtags']);
1284         } else {
1285             $current_tags = array();
1286         }
1287         $addtag = true;
1288         foreach ($current_tags as $value) {
1289             if ($value === $_GET['addtag']) {
1290                 $addtag = false;
1291                 break;
1292             }
1293         }
1294         // Append the tag if necessary
1295         if (empty($params['searchtags'])) {
1296             $params['searchtags'] = trim($_GET['addtag']);
1297         }
1298         else if ($addtag) {
1299             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1300         }
1301
1302         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1303         header('Location: ?'.http_build_query($params));
1304         exit;
1305     }
1306
1307     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1308     if (isset($_GET['removetag'])) {
1309         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1310         if (empty($_SERVER['HTTP_REFERER'])) {
1311             header('Location: ?');
1312             exit;
1313         }
1314
1315         // In case browser does not send HTTP_REFERER
1316         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1317
1318         // Prevent redirection loop
1319         if (isset($params['removetag'])) {
1320             unset($params['removetag']);
1321         }
1322
1323         if (isset($params['searchtags'])) {
1324             $tags = explode(' ', $params['searchtags']);
1325             // Remove value from array $tags.
1326             $tags = array_diff($tags, array($_GET['removetag']));
1327             $params['searchtags'] = implode(' ',$tags);
1328
1329             if (empty($params['searchtags'])) {
1330                 unset($params['searchtags']);
1331             }
1332
1333             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1334         }
1335         header('Location: ?'.http_build_query($params));
1336         exit;
1337     }
1338
1339     // -------- User wants to change the number of links per page (linksperpage=...)
1340     if (isset($_GET['linksperpage'])) {
1341         if (is_numeric($_GET['linksperpage'])) {
1342             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1343         }
1344
1345         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1346         exit;
1347     }
1348
1349     // -------- User wants to see only private links (toggle)
1350     if (isset($_GET['privateonly'])) {
1351         if (empty($_SESSION['privateonly'])) {
1352             $_SESSION['privateonly'] = 1; // See only private links
1353         } else {
1354             unset($_SESSION['privateonly']); // See all links
1355         }
1356
1357         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1358         exit;
1359     }
1360
1361     // -------- Handle other actions allowed for non-logged in users:
1362     if (!isLoggedIn())
1363     {
1364         // User tries to post new link but is not logged in:
1365         // Show login screen, then redirect to ?post=...
1366         if (isset($_GET['post']))
1367         {
1368             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1369             exit;
1370         }
1371
1372                 // Same case as above except that user tried to access ?do=addlink without being logged in
1373                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1374                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1375                         header('Location: ?do=login&post=');
1376                         exit;
1377                 }
1378         showLinkList($PAGE, $LINKSDB);
1379         if (isset($_GET['edit_link'])) {
1380             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1381             exit;
1382         }
1383
1384         exit; // Never remove this one! All operations below are reserved for logged in user.
1385     }
1386
1387     // -------- All other functions are reserved for the registered user:
1388
1389     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1390     if ($targetPage == Router::$PAGE_TOOLS)
1391     {
1392         $data = array(
1393             'linkcount' => count($LINKSDB),
1394             'pageabsaddr' => index_url($_SERVER),
1395         );
1396         $pluginManager->executeHooks('render_tools', $data);
1397
1398         foreach ($data as $key => $value) {
1399             $PAGE->assign($key, $value);
1400         }
1401
1402         $PAGE->renderPage('tools');
1403         exit;
1404     }
1405
1406     // -------- User wants to change his/her password.
1407     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1408     {
1409         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1410         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1411         {
1412             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1413
1414             // Make sure old password is correct.
1415             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1416             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1417             // Save new password
1418             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1419             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1420             try {
1421                 writeConfig($GLOBALS, isLoggedIn());
1422             }
1423             catch(Exception $e) {
1424                 error_log(
1425                     'ERROR while writing config file after changing password.' . PHP_EOL .
1426                     $e->getMessage()
1427                 );
1428
1429                 // TODO: do not handle exceptions/errors in JS.
1430                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1431                 exit;
1432             }
1433             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1434             exit;
1435         }
1436         else // show the change password form.
1437         {
1438             $PAGE->assign('linkcount',count($LINKSDB));
1439             $PAGE->assign('token',getToken());
1440             $PAGE->renderPage('changepassword');
1441             exit;
1442         }
1443     }
1444
1445     // -------- User wants to change configuration
1446     if ($targetPage == Router::$PAGE_CONFIGURE)
1447     {
1448         if (!empty($_POST['title']) )
1449         {
1450             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1451             $tz = 'UTC';
1452             if (!empty($_POST['continent']) && !empty($_POST['city']))
1453                 if (isTimeZoneValid($_POST['continent'],$_POST['city']))
1454                     $tz = $_POST['continent'].'/'.$_POST['city'];
1455             $GLOBALS['timezone'] = $tz;
1456             $GLOBALS['title']=$_POST['title'];
1457             $GLOBALS['titleLink']=$_POST['titleLink'];
1458             $GLOBALS['redirector']=$_POST['redirector'];
1459             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1460             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1461             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1462             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1463             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1464             try {
1465                 writeConfig($GLOBALS, isLoggedIn());
1466             }
1467             catch(Exception $e) {
1468                 error_log(
1469                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1470                     $e->getMessage()
1471                 );
1472
1473                 // TODO: do not handle exceptions/errors in JS.
1474                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1475                 exit;
1476             }
1477             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1478             exit;
1479         }
1480         else // Show the configuration form.
1481         {
1482             $PAGE->assign('linkcount',count($LINKSDB));
1483             $PAGE->assign('token',getToken());
1484             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1485             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1486             list($timezone_form, $timezone_js) = generateTimeZoneForm($GLOBALS['timezone']);
1487             $PAGE->assign('timezone_form', $timezone_form);
1488             $PAGE->assign('timezone_js',$timezone_js);
1489             $PAGE->renderPage('configure');
1490             exit;
1491         }
1492     }
1493
1494     // -------- User wants to rename a tag or delete it
1495     if ($targetPage == Router::$PAGE_CHANGETAG)
1496     {
1497         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1498             $PAGE->assign('linkcount', count($LINKSDB));
1499             $PAGE->assign('token', getToken());
1500             $PAGE->assign('tags', $LINKSDB->allTags());
1501             $PAGE->renderPage('changetag');
1502             exit;
1503         }
1504
1505         if (!tokenOk($_POST['token'])) {
1506             die('Wrong token.');
1507         }
1508
1509         // Delete a tag:
1510         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1511             $needle=trim($_POST['fromtag']);
1512             // True for case-sensitive tag search.
1513             $linksToAlter = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $needle, true);
1514             foreach($linksToAlter as $key=>$value)
1515             {
1516                 $tags = explode(' ',trim($value['tags']));
1517                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1518                 $value['tags']=trim(implode(' ',$tags));
1519                 $LINKSDB[$key]=$value;
1520             }
1521             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1522             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1523             exit;
1524         }
1525
1526         // Rename a tag:
1527         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1528             $needle=trim($_POST['fromtag']);
1529             // True for case-sensitive tag search.
1530             $linksToAlter = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $needle, true);
1531             foreach($linksToAlter as $key=>$value)
1532             {
1533                 $tags = explode(' ',trim($value['tags']));
1534                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1535                 $value['tags']=trim(implode(' ',$tags));
1536                 $LINKSDB[$key]=$value;
1537             }
1538             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1539             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1540             exit;
1541         }
1542     }
1543
1544     // -------- User wants to add a link without using the bookmarklet: Show form.
1545     if ($targetPage == Router::$PAGE_ADDLINK)
1546     {
1547         $PAGE->assign('linkcount',count($LINKSDB));
1548         $PAGE->renderPage('addlink');
1549         exit;
1550     }
1551
1552     // -------- User clicked the "Save" button when editing a link: Save link to database.
1553     if (isset($_POST['save_edit']))
1554     {
1555         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1556         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1557         $tags = implode(' ', array_unique(explode(' ', $tags))); // Remove duplicates.
1558         $linkdate=$_POST['lf_linkdate'];
1559         $url = trim($_POST['lf_url']);
1560         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?') && !startsWith($url,'javascript:'))
1561             $url = 'http://'.$url;
1562         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1563                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1564         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1565
1566         $pluginManager->executeHooks('save_link', $link);
1567
1568         $LINKSDB[$linkdate] = $link;
1569         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1570         pubsubhub();
1571
1572         // If we are called from the bookmarklet, we must close the popup:
1573         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1574             echo '<script>self.close();</script>';
1575             exit;
1576         }
1577
1578         $returnurl = !empty($_POST['returnurl']) ? escape($_POST['returnurl']): '?';
1579         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1580         $location .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1581         header('Location: '. $location); // After saving the link, redirect to the page the user was on.
1582         exit;
1583     }
1584
1585     // -------- User clicked the "Cancel" button when editing a link.
1586     if (isset($_POST['cancel_edit']))
1587     {
1588         // If we are called from the bookmarklet, we must close the popup:
1589         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1590         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1591         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1592         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1593         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1594         exit;
1595     }
1596
1597     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1598     if (isset($_POST['delete_link']))
1599     {
1600         if (!tokenOk($_POST['token'])) die('Wrong token.');
1601         // We do not need to ask for confirmation:
1602         // - confirmation is handled by JavaScript
1603         // - we are protected from XSRF by the token.
1604         $linkdate=$_POST['lf_linkdate'];
1605
1606         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1607
1608         unset($LINKSDB[$linkdate]);
1609         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // save to disk
1610
1611         // If we are called from the bookmarklet, we must close the popup:
1612         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1613         // Pick where we're going to redirect
1614         // =============================================================
1615         // Basically, we can't redirect to where we were previously if it was a permalink
1616         // or an edit_link, because it would 404.
1617         // Cases:
1618         //    - /             : nothing in $_GET, redirect to self
1619         //    - /?page        : redirect to self
1620         //    - /?searchterm  : redirect to self (there might be other links)
1621         //    - /?searchtags  : redirect to self
1622         //    - /permalink    : redirect to / (the link does not exist anymore)
1623         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1624         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1625         // redirect is not satisfied, and only then redirect to /
1626         $location = "?";
1627         // Self redirection
1628         if (count($_GET) == 0
1629             || isset($_GET['page'])
1630             || isset($_GET['searchterm'])
1631             || isset($_GET['searchtags'])
1632         ) {
1633             if (isset($_POST['returnurl'])) {
1634                 $location = $_POST['returnurl']; // Handle redirects given by the form
1635             } else {
1636                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1637             }
1638         }
1639
1640         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1641         exit;
1642     }
1643
1644     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1645     if (isset($_GET['edit_link']))
1646     {
1647         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1648         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1649         $data = array(
1650             'linkcount' => count($LINKSDB),
1651             'link' => $link,
1652             'link_is_new' => false,
1653             'token' => getToken(),
1654             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1655             'tags' => $LINKSDB->allTags(),
1656         );
1657         $pluginManager->executeHooks('render_editlink', $data);
1658
1659         foreach ($data as $key => $value) {
1660             $PAGE->assign($key, $value);
1661         }
1662
1663         $PAGE->renderPage('editlink');
1664         exit;
1665     }
1666
1667     // -------- User want to post a new link: Display link edit form.
1668     if (isset($_GET['post'])) {
1669         $url = cleanup_url(escape($_GET['post']));
1670
1671         $link_is_new = false;
1672         // Check if URL is not already in database (in this case, we will edit the existing link)
1673         $link = $LINKSDB->getLinkFromUrl($url);
1674         if (!$link)
1675         {
1676             $link_is_new = true;
1677             $linkdate = strval(date('Ymd_His'));
1678             // Get title if it was provided in URL (by the bookmarklet).
1679             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1680             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1681             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1682             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1683             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1684             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1685             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1686                 // Short timeout to keep the application responsive
1687                 list($headers, $content) = get_http_response($url, 4);
1688                 if (strpos($headers[0], '200 OK') !== false) {
1689                     // Retrieve charset.
1690                     $charset = get_charset($headers, $content);
1691                     // Extract title.
1692                     $title = html_extract_title($content);
1693                     // Re-encode title in utf-8 if necessary.
1694                     if (! empty($title) && $charset != 'utf-8') {
1695                         $title = mb_convert_encoding($title, $charset, 'utf-8');
1696                     }
1697                 }
1698             }
1699
1700             if ($url == '') {
1701                 $url = '?' . smallHash($linkdate);
1702                 $title = 'Note: ';
1703             }
1704
1705             $link = array(
1706                 'linkdate' => $linkdate,
1707                 'title' => $title,
1708                 'url' => $url,
1709                 'description' => $description,
1710                 'tags' => $tags,
1711                 'private' => $private
1712             );
1713         }
1714
1715         $data = array(
1716             'linkcount' => count($LINKSDB),
1717             'link' => $link,
1718             'link_is_new' => $link_is_new,
1719             'token' => getToken(), // XSRF protection.
1720             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1721             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1722             'tags' => $LINKSDB->allTags(),
1723         );
1724         $pluginManager->executeHooks('render_editlink', $data);
1725
1726         foreach ($data as $key => $value) {
1727             $PAGE->assign($key, $value);
1728         }
1729
1730         $PAGE->renderPage('editlink');
1731         exit;
1732     }
1733
1734     // -------- Export as Netscape Bookmarks HTML file.
1735     if ($targetPage == Router::$PAGE_EXPORT)
1736     {
1737         if (empty($_GET['what']))
1738         {
1739             $PAGE->assign('linkcount',count($LINKSDB));
1740             $PAGE->renderPage('export');
1741             exit;
1742         }
1743         $exportWhat=$_GET['what'];
1744         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1745
1746         header('Content-Type: text/html; charset=utf-8');
1747         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1748         $currentdate=date('Y/m/d H:i:s');
1749         echo <<<HTML
1750 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1751 <!-- This is an automatically generated file.
1752      It will be read and overwritten.
1753      DO NOT EDIT! -->
1754 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1755 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1756 <TITLE>Bookmarks</TITLE>
1757 <H1>Bookmarks</H1>
1758 HTML;
1759         foreach($LINKSDB as $link)
1760         {
1761             if ($exportWhat=='all' ||
1762                ($exportWhat=='private' && $link['private']!=0) ||
1763                ($exportWhat=='public' && $link['private']==0))
1764             {
1765                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1766                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1767                 echo '>'.$link['title']."</A>\n";
1768                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1769             }
1770         }
1771                 exit;
1772     }
1773
1774     // -------- User is uploading a file for import
1775     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1776     {
1777         // If file is too big, some form field may be missing.
1778         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1779         {
1780             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1781             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1782             exit;
1783         }
1784         if (!tokenOk($_POST['token'])) die('Wrong token.');
1785         importFile();
1786         exit;
1787     }
1788
1789     // -------- Show upload/import dialog:
1790     if ($targetPage == Router::$PAGE_IMPORT)
1791     {
1792         $PAGE->assign('linkcount',count($LINKSDB));
1793         $PAGE->assign('token',getToken());
1794         $PAGE->assign('maxfilesize',getMaxFileSize());
1795         $PAGE->renderPage('import');
1796         exit;
1797     }
1798
1799     // Plugin administration page
1800     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1801         $pluginMeta = $pluginManager->getPluginsMeta();
1802
1803         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1804         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1805         // Load parameters.
1806         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $GLOBALS['plugins']);
1807         uasort(
1808             $enabledPlugins,
1809             function($a, $b) { return $a['order'] - $b['order']; }
1810         );
1811         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1812
1813         $PAGE->assign('enabledPlugins', $enabledPlugins);
1814         $PAGE->assign('disabledPlugins', $disabledPlugins);
1815         $PAGE->renderPage('pluginsadmin');
1816         exit;
1817     }
1818
1819     // Plugin administration form action
1820     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1821         try {
1822             if (isset($_POST['parameters_form'])) {
1823                 unset($_POST['parameters_form']);
1824                 foreach ($_POST as $param => $value) {
1825                     $GLOBALS['plugins'][$param] = escape($value);
1826                 }
1827             }
1828             else {
1829                 $GLOBALS['config']['ENABLED_PLUGINS'] = save_plugin_config($_POST);
1830             }
1831             writeConfig($GLOBALS, isLoggedIn());
1832         }
1833         catch (Exception $e) {
1834             error_log(
1835                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1836                 $e->getMessage()
1837             );
1838
1839             // TODO: do not handle exceptions/errors in JS.
1840             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=pluginsadmin\';</script>';
1841             exit;
1842         }
1843         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1844         exit;
1845     }
1846
1847     // -------- Otherwise, simply display search form and links:
1848     showLinkList($PAGE, $LINKSDB);
1849     exit;
1850 }
1851
1852 // -----------------------------------------------------------------------------------------------
1853 // Process the import file form.
1854 function importFile()
1855 {
1856     if (!isLoggedIn()) { die('Not allowed.'); }
1857     $LINKSDB = new LinkDB(
1858         $GLOBALS['config']['DATASTORE'],
1859         isLoggedIn(),
1860         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1861         $GLOBALS['redirector']
1862     );
1863     $filename=$_FILES['filetoupload']['name'];
1864     $filesize=$_FILES['filetoupload']['size'];
1865     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1866     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1867     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1868     $import_count=0;
1869
1870     // Sniff file type:
1871     $type='unknown';
1872     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1873
1874     // Then import the bookmarks.
1875     if ($type=='netscape')
1876     {
1877         // This is a standard Netscape-style bookmark file.
1878         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1879         foreach(explode('<DT>',$data) as $html) // explode is very fast
1880         {
1881             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1882             $d = explode('<DD>',$html);
1883             if (startswith($d[0],'<A '))
1884             {
1885                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1886                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1887                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1888                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1889                 $raw_add_date=0;
1890                 foreach($matches as $m)
1891                 {
1892                     $attr=$m[1]; $value=$m[2];
1893                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1894                     elseif ($attr=='ADD_DATE')
1895                     {
1896                         $raw_add_date=intval($value);
1897                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1898                     }
1899                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1900                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1901                 }
1902                 if ($link['url']!='')
1903                 {
1904                     if ($private==1) $link['private']=1;
1905                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1906                     if ($dblink==false)
1907                     {  // Link not in database, let's import it...
1908                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1909
1910                        // Make sure date/time is not already used by another link.
1911                        // (Some bookmark files have several different links with the same ADD_DATE)
1912                        // We increment date by 1 second until we find a date which is not used in DB.
1913                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1914                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1915                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1916                        $LINKSDB[$link['linkdate']] = $link;
1917                        $import_count++;
1918                     }
1919                     else // Link already present in database.
1920                     {
1921                         if ($overwrite)
1922                         {   // If overwrite is required, we import link data, except date/time.
1923                             $link['linkdate']=$dblink['linkdate'];
1924                             $LINKSDB[$link['linkdate']] = $link;
1925                             $import_count++;
1926                         }
1927                     }
1928
1929                 }
1930             }
1931         }
1932         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1933
1934         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1935     }
1936     else
1937     {
1938         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1939     }
1940 }
1941
1942 // -----------------------------------------------------------------------------------------------
1943 // Template for the list of links (<div id="linklist">)
1944 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1945 function buildLinkList($PAGE,$LINKSDB)
1946 {
1947     // ---- Filter link database according to parameters
1948     $search_type = '';
1949     $search_crits = '';
1950     $privateonly = !empty($_SESSION['privateonly']) ? true : false;
1951
1952     // Fulltext search
1953     if (isset($_GET['searchterm'])) {
1954         $search_crits = escape(trim($_GET['searchterm']));
1955         $search_type = LinkFilter::$FILTER_TEXT;
1956         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits, false, $privateonly);
1957     }
1958     // Search by tag
1959     elseif (isset($_GET['searchtags'])) {
1960         $search_crits = explode(' ', escape(trim($_GET['searchtags'])));
1961         $search_type = LinkFilter::$FILTER_TAG;
1962         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits, false, $privateonly);
1963     }
1964     // Detect smallHashes in URL.
1965     elseif (isset($_SERVER['QUERY_STRING'])
1966         && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/', $_SERVER['QUERY_STRING'])) {
1967         $search_type = LinkFilter::$FILTER_HASH;
1968         $search_crits = substr(trim($_SERVER["QUERY_STRING"], '/'), 0, 6);
1969         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits);
1970
1971         if (count($linksToDisplay) == 0) {
1972             $PAGE->render404('The link you are trying to reach does not exist or has been deleted.');
1973             exit;
1974         }
1975     }
1976     // Otherwise, display without filtering.
1977     else {
1978         $linksToDisplay = $LINKSDB->filter('', '', false, $privateonly);
1979     }
1980
1981     // ---- Handle paging.
1982     $keys = array();
1983     foreach ($linksToDisplay as $key => $value) {
1984         $keys[] = $key;
1985     }
1986
1987     // If there is only a single link, we change on-the-fly the title of the page.
1988     if (count($linksToDisplay) == 1) {
1989         $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1990     }
1991
1992     // Select articles according to paging.
1993     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1994     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1995     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1996     $page = $page < 1 ? 1 : $page;
1997     $page = $page > $pagecount ? $pagecount : $page;
1998     // Start index.
1999     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
2000     $end = $i + $_SESSION['LINKS_PER_PAGE'];
2001     $linkDisp = array();
2002     while ($i<$end && $i<count($keys))
2003     {
2004         $link = $linksToDisplay[$keys[$i]];
2005         $link['description'] = format_description($link['description'], $GLOBALS['redirector']);
2006         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
2007         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
2008         $link['timestamp'] = linkdate2timestamp($link['linkdate']);
2009         $taglist = explode(' ', $link['tags']);
2010         uasort($taglist, 'strcasecmp');
2011         $link['taglist'] = $taglist;
2012         $link['shorturl'] = smallHash($link['linkdate']);
2013         // Check for both signs of a note: starting with ? and 7 chars long.
2014         if ($link['url'][0] === '?' &&
2015             strlen($link['url']) === 7) {
2016             $link['url'] = index_url($_SERVER) . $link['url'];
2017         }
2018
2019         $linkDisp[$keys[$i]] = $link;
2020         $i++;
2021     }
2022
2023     // Compute paging navigation
2024     $searchterm = empty($_GET['searchterm']) ? '' : '&searchterm=' . $_GET['searchterm'];
2025     $searchtags = empty($_GET['searchtags']) ? '' : '&searchtags=' . $_GET['searchtags'];
2026     $previous_page_url = '';
2027     if ($i != count($keys)) {
2028         $previous_page_url = '?page=' . ($page+1) . $searchterm . $searchtags;
2029     }
2030     $next_page_url='';
2031     if ($page>1) {
2032         $next_page_url = '?page=' . ($page-1) . $searchterm . $searchtags;
2033     }
2034
2035     $token = '';
2036     if (isLoggedIn()) {
2037         $token = getToken();
2038     }
2039
2040     // Fill all template fields.
2041     $data = array(
2042         'linkcount' => count($LINKSDB),
2043         'previous_page_url' => $previous_page_url,
2044         'next_page_url' => $next_page_url,
2045         'page_current' => $page,
2046         'page_max' => $pagecount,
2047         'result_count' => count($linksToDisplay),
2048         'search_type' => $search_type,
2049         'search_crits' => $search_crits,
2050         'redirector' => empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'],  // Optional redirector URL.
2051         'token' => $token,
2052         'links' => $linkDisp,
2053         'tags' => $LINKSDB->allTags(),
2054     );
2055     // FIXME! temporary fix - see #399.
2056     if (!empty($GLOBALS['pagetitle']) && count($linkDisp) == 1) {
2057         $data['pagetitle'] = $GLOBALS['pagetitle'];
2058     }
2059
2060     $pluginManager = PluginManager::getInstance();
2061     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
2062
2063     foreach ($data as $key => $value) {
2064         $PAGE->assign($key, $value);
2065     }
2066
2067     return;
2068 }
2069
2070 // Compute the thumbnail for a link.
2071 //
2072 // With a link to the original URL.
2073 // Understands various services (youtube.com...)
2074 // Input: $url = URL for which the thumbnail must be found.
2075 //        $href = if provided, this URL will be followed instead of $url
2076 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
2077 // Some of them may be missing.
2078 // Return an empty array if no thumbnail available.
2079 function computeThumbnail($url,$href=false)
2080 {
2081     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
2082     if ($href==false) $href=$url;
2083
2084     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
2085     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
2086     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
2087     $domain = parse_url($url,PHP_URL_HOST);
2088     if ($domain=='youtube.com' || $domain=='www.youtube.com')
2089     {
2090         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
2091         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
2092                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2093     }
2094     if ($domain=='youtu.be') // Youtube short links
2095     {
2096         $path = parse_url($url,PHP_URL_PATH);
2097         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
2098                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2099     }
2100     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
2101     {
2102         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
2103         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
2104                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
2105     }
2106
2107     if ($domain=='imgur.com')
2108     {
2109         $path = parse_url($url,PHP_URL_PATH);
2110         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
2111         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
2112                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2113         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
2114                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2115
2116         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
2117                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2118     }
2119     if ($domain=='i.imgur.com')
2120     {
2121         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
2122         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
2123                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2124     }
2125     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
2126     {
2127         if (strpos($url,'dailymotion.com/video/')!==false)
2128         {
2129             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
2130             return array('src'=>$thumburl,
2131                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
2132         }
2133     }
2134     if (endsWith($domain,'.imageshack.us'))
2135     {
2136         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2137         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2138         {
2139             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
2140             return array('src'=>$thumburl,
2141                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
2142         }
2143     }
2144
2145     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
2146     // So we deport the thumbnail generation in order not to slow down page generation
2147     // (and we also cache the thumbnail)
2148
2149     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
2150
2151     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
2152         || $domain=='vimeo.com'
2153         || $domain=='ted.com' || endsWith($domain,'.ted.com')
2154         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
2155     )
2156     {
2157         if ($domain=='vimeo.com')
2158         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
2159             $path = parse_url($url,PHP_URL_PATH);
2160             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
2161         }
2162         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2163         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
2164             $path = parse_url($url,PHP_URL_PATH);
2165             if (!preg_match('!/\d+.+?!',$path)) return array();
2166         }
2167         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2168         {   // Make sure this TED URL points to a video (/talks/...)
2169             $path = parse_url($url,PHP_URL_PATH);
2170             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
2171         }
2172         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2173         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2174                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2175     }
2176
2177     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
2178     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
2179     // But using the extension will do.
2180     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2181     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2182     {
2183         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2184         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2185                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2186     }
2187     return array(); // No thumbnail.
2188
2189 }
2190
2191
2192 // Returns the HTML code to display a thumbnail for a link
2193 // with a link to the original URL.
2194 // Understands various services (youtube.com...)
2195 // Input: $url = URL for which the thumbnail must be found.
2196 //        $href = if provided, this URL will be followed instead of $url
2197 // Returns '' if no thumbnail available.
2198 function thumbnail($url,$href=false)
2199 {
2200     $t = computeThumbnail($url,$href);
2201     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2202
2203     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
2204     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2205     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2206     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2207     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2208     $html.='></a>';
2209     return $html;
2210 }
2211
2212 // Returns the HTML code to display a thumbnail for a link
2213 // for the picture wall (using lazy image loading)
2214 // Understands various services (youtube.com...)
2215 // Input: $url = URL for which the thumbnail must be found.
2216 //        $href = if provided, this URL will be followed instead of $url
2217 // Returns '' if no thumbnail available.
2218 function lazyThumbnail($url,$href=false)
2219 {
2220     $t = computeThumbnail($url,$href);
2221     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2222
2223     $html='<a href="'.escape($t['href']).'">';
2224
2225     // Lazy image
2226     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
2227
2228     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2229     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2230     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2231     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2232     $html.='>';
2233
2234     // No-JavaScript fallback.
2235     $html.='<noscript><img src="'.escape($t['src']).'"';
2236     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2237     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2238     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2239     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2240     $html.='></noscript></a>';
2241
2242     return $html;
2243 }
2244
2245
2246 // -----------------------------------------------------------------------------------------------
2247 // Installation
2248 // This function should NEVER be called if the file data/config.php exists.
2249 function install()
2250 {
2251     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2252     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2253
2254
2255     // This part makes sure sessions works correctly.
2256     // (Because on some hosts, session.save_path may not be set correctly,
2257     // or we may not have write access to it.)
2258     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2259     {   // Step 2: Check if data in session is correct.
2260         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2261         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2262         echo 'It currently points to '.session_save_path().'<br>';
2263         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2264         echo '<br><a href="?">Click to try again.</a></pre>';
2265         die;
2266     }
2267     if (!isset($_SESSION['session_tested']))
2268     {   // Step 1 : Try to store data in session and reload page.
2269         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2270         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
2271     }
2272     if (isset($_GET['test_session']))
2273     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2274         header('Location: '.index_url($_SERVER));
2275     }
2276
2277
2278     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2279     {
2280         $tz = 'UTC';
2281         if (!empty($_POST['continent']) && !empty($_POST['city'])) {
2282             if (isTimeZoneValid($_POST['continent'], $_POST['city'])) {
2283                 $tz = $_POST['continent'].'/'.$_POST['city'];
2284             }
2285         }
2286         $GLOBALS['timezone'] = $tz;
2287         // Everything is ok, let's create config file.
2288         $GLOBALS['login'] = $_POST['setlogin'];
2289         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2290         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2291         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(index_url($_SERVER)) : $_POST['title'] );
2292         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2293         try {
2294             writeConfig($GLOBALS, isLoggedIn());
2295         }
2296         catch(Exception $e) {
2297             error_log(
2298                     'ERROR while writing config file after installation.' . PHP_EOL .
2299                     $e->getMessage()
2300                 );
2301
2302             // TODO: do not handle exceptions/errors in JS.
2303             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2304             exit;
2305         }
2306         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2307         exit;
2308     }
2309
2310     // Display config form:
2311     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2312     $timezone_html = '';
2313     if ($timezone_form != '') {
2314         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2315     }
2316
2317     $PAGE = new pageBuilder;
2318     $PAGE->assign('timezone_html',$timezone_html);
2319     $PAGE->assign('timezone_js',$timezone_js);
2320     $PAGE->renderPage('install');
2321     exit;
2322 }
2323
2324 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2325    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2326    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2327    This function is called by passing the URL:
2328    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2329    [URL] is the URL of the link (e.g. a flickr page)
2330    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2331    The function below will fetch the image from the webservice and store it in the cache.
2332 */
2333 function genThumbnail()
2334 {
2335     // Make sure the parameters in the URL were generated by us.
2336     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2337     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2338
2339     // Let's see if we don't already have the image for this URL in the cache.
2340     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2341     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2342     {   // We have the thumbnail, just serve it:
2343         header('Content-Type: image/jpeg');
2344         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2345         return;
2346     }
2347     // We may also serve a blank image (if service did not respond)
2348     $blankname=hash('sha1',$_GET['url']).'.gif';
2349     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2350     {
2351         header('Content-Type: image/gif');
2352         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2353         return;
2354     }
2355
2356     // Otherwise, generate the thumbnail.
2357     $url = $_GET['url'];
2358     $domain = parse_url($url,PHP_URL_HOST);
2359
2360     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2361     {
2362         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2363         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2364
2365         // Is this a link to an image, or to a flickr page ?
2366         $imageurl='';
2367         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2368         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2369             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2370             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2371         }
2372         else // This is a flickr page (html)
2373         {
2374             // Get the flickr html page.
2375             list($headers, $content) = get_http_response($url, 20);
2376             if (strpos($headers[0], '200 OK') !== false)
2377             {
2378                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2379                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2380                 if (!empty($matches[1])) $imageurl=$matches[1];
2381
2382                 // In albums (and some other pages), the link rel="image_src" is not provided,
2383                 // but flickr provides:
2384                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2385                 if ($imageurl=='')
2386                 {
2387                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2388                     if (!empty($matches[1])) $imageurl=$matches[1];
2389                 }
2390             }
2391         }
2392
2393         if ($imageurl!='')
2394         {   // Let's download the image.
2395             // Image is 240x120, so 10 seconds to download should be enough.
2396             list($headers, $content) = get_http_response($imageurl, 10);
2397             if (strpos($headers[0], '200 OK') !== false) {
2398                 // Save image to cache.
2399                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/' . $thumbname, $content);
2400                 header('Content-Type: image/jpeg');
2401                 echo $content;
2402                 return;
2403             }
2404         }
2405     }
2406
2407     elseif ($domain=='vimeo.com' )
2408     {
2409         // This is more complex: we have to perform a HTTP request, then parse the result.
2410         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2411         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2412         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2413         if (strpos($headers[0], '200 OK') !== false) {
2414             $t = unserialize($content);
2415             $imageurl = $t[0]['thumbnail_medium'];
2416             // Then we download the image and serve it to our client.
2417             list($headers, $content) = get_http_response($imageurl, 10);
2418             if (strpos($headers[0], '200 OK') !== false) {
2419                 // Save image to cache.
2420                 file_put_contents($GLOBALS['config']['CACHEDIR'] . '/' . $thumbname, $content);
2421                 header('Content-Type: image/jpeg');
2422                 echo $content;
2423                 return;
2424             }
2425         }
2426     }
2427
2428     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2429     {
2430         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2431         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2432         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2433         list($headers, $content) = get_http_response($url, 5);
2434         if (strpos($headers[0], '200 OK') !== false) {
2435             // Extract the link to the thumbnail
2436             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2437             if (!empty($matches[1]))
2438             {   // Let's download the image.
2439                 $imageurl=$matches[1];
2440                 // No control on image size, so wait long enough
2441                 list($headers, $content) = get_http_response($imageurl, 20);
2442                 if (strpos($headers[0], '200 OK') !== false) {
2443                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2444                     file_put_contents($filepath, $content); // Save image to cache.
2445                     if (resizeImage($filepath))
2446                     {
2447                         header('Content-Type: image/jpeg');
2448                         echo file_get_contents($filepath);
2449                         return;
2450                     }
2451                 }
2452             }
2453         }
2454     }
2455
2456     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2457     {
2458         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2459         // http://xkcd.com/327/
2460         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2461         list($headers, $content) = get_http_response($url, 5);
2462         if (strpos($headers[0], '200 OK') !== false) {
2463             // Extract the link to the thumbnail
2464             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2465             if (!empty($matches[1]))
2466             {   // Let's download the image.
2467                 $imageurl=$matches[1];
2468                 // No control on image size, so wait long enough
2469                 list($headers, $content) = get_http_response($imageurl, 20);
2470                 if (strpos($headers[0], '200 OK') !== false) {
2471                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2472                     // Save image to cache.
2473                     file_put_contents($filepath, $content);
2474                     if (resizeImage($filepath))
2475                     {
2476                         header('Content-Type: image/jpeg');
2477                         echo file_get_contents($filepath);
2478                         return;
2479                     }
2480                 }
2481             }
2482         }
2483     }
2484
2485     else
2486     {
2487         // For all other domains, we try to download the image and make a thumbnail.
2488         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2489         list($headers, $content) = get_http_response($url, 30);
2490         if (strpos($headers[0], '200 OK') !== false) {
2491             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2492             // Save image to cache.
2493             file_put_contents($filepath, $content);
2494             if (resizeImage($filepath))
2495             {
2496                 header('Content-Type: image/jpeg');
2497                 echo file_get_contents($filepath);
2498                 return;
2499             }
2500         }
2501     }
2502
2503
2504     // Otherwise, return an empty image (8x8 transparent gif)
2505     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2506     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2507     header('Content-Type: image/gif');
2508     echo $blankgif;
2509 }
2510
2511 // Make a thumbnail of the image (to width: 120 pixels)
2512 // Returns true if success, false otherwise.
2513 function resizeImage($filepath)
2514 {
2515     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2516
2517     // Trick: some stupid people rename GIF as JPEG... or else.
2518     // So we really try to open each image type whatever the extension is.
2519     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2520     $im=false;
2521     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2522     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2523     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2524     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2525     $w = imagesx($im);
2526     $h = imagesy($im);
2527     $ystart = 0; $yheight=$h;
2528     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2529     $nw = 120;   // Desired width
2530     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2531     // Resize image:
2532     $im2 = imagecreatetruecolor($nw,$nh);
2533     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2534     imageinterlace($im2,true); // For progressive JPEG.
2535     $tempname=$filepath.'_TEMP.jpg';
2536     imagejpeg($im2, $tempname, 90);
2537     imagedestroy($im);
2538     imagedestroy($im2);
2539     unlink($filepath);
2540     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2541     return true;
2542 }
2543
2544 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2545 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2546 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2547 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2548 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2549 renderPage();
2550 ?>