index.php

   1 <?php
   2 /**
   3  * Shaarli v0.6.3 - Shaare your links...
   4  *
   5  * The personal, minimalist, super-fast, no-database Delicious clone.
   6  *
   7  * Friendly fork by the Shaarli community:
   8  *  - https://github.com/shaarli/Shaarli
   9  *
  10  * Original project by sebsauvage.net:
  11  *  - http://sebsauvage.net/wiki/doku.php?id=php:shaarli
  12  *  - https://github.com/sebsauvage/Shaarli
  13  *
  14  * Licence: http://www.opensource.org/licenses/zlib-license.php
  15  *
  16  * Requires: PHP 5.3.x
  17  */
  18
  19 // Set 'UTC' as the default timezone if it is not defined in php.ini
  20 // See http://php.net/manual/en/datetime.configuration.php#ini.date.timezone
  21 if (date_default_timezone_get() == '') {
  22     date_default_timezone_set('UTC');
  23 }
  24
  25 /* -----------------------------------------------------------------------------
  26  * Hardcoded parameters
  27  * You should not touch any code below (or at your own risks!)
  28  * (These parameters can be overwritten by editing the file /data/config.php)
  29  * -----------------------------------------------------------------------------
  30  */
  31
  32 /*
  33  * Shaarli directories & configuration files
  34  */
  35 // Data subdirectory
  36 $GLOBALS['config']['DATADIR'] = 'data';
  37
  38 // Main configuration file
  39 $GLOBALS['config']['CONFIG_FILE'] = $GLOBALS['config']['DATADIR'].'/config.php';
  40
  41 // Link datastore
  42 $GLOBALS['config']['DATASTORE'] = $GLOBALS['config']['DATADIR'].'/datastore.php';
  43
  44 // Banned IPs
  45 $GLOBALS['config']['IPBANS_FILENAME'] = $GLOBALS['config']['DATADIR'].'/ipbans.php';
  46
  47 // Access log
  48 $GLOBALS['config']['LOG_FILE'] = $GLOBALS['config']['DATADIR'].'/log.txt';
  49
  50 // For updates check of Shaarli
  51 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt';
  52
  53 // RainTPL cache directory (keep the trailing slash!)
  54 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp/';
  55 // Raintpl template directory (keep the trailing slash!)
  56 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/';
  57
  58 // Thumbnail cache directory
  59 $GLOBALS['config']['CACHEDIR'] = 'cache';
  60
  61 // Atom & RSS feed cache directory
  62 $GLOBALS['config']['PAGECACHE'] = 'pagecache';
  63
  64
  65 /*
  66  * Global configuration
  67  */
  68 // Ban IP after this many failures
  69 $GLOBALS['config']['BAN_AFTER'] = 4;
  70 // Ban duration for IP address after login failures (in seconds)
  71 $GLOBALS['config']['BAN_DURATION'] = 1800;
  72
  73 // Feed options
  74 // Enable RSS permalinks by default.
  75 // This corresponds to the default behavior of shaarli before this was added as an option.
  76 $GLOBALS['config']['ENABLE_RSS_PERMALINKS'] = true;
  77 // If true, an extra "ATOM feed" button will be displayed in the toolbar
  78 $GLOBALS['config']['SHOW_ATOM'] = false;
  79
  80 // Link display options
  81 $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = false;
  82 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false;
  83 $GLOBALS['config']['LINKS_PER_PAGE'] = 20;
  84
  85 // Open Shaarli (true): anyone can add/edit/delete links without having to login
  86 $GLOBALS['config']['OPEN_SHAARLI'] = false;
  87
  88 // Thumbnails
  89 // Display thumbnails in links
  90 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true;
  91 // Store thumbnails in a local cache
  92 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true;
  93
  94 // Update check frequency for Shaarli. 86400 seconds=24 hours
  95 $GLOBALS['config']['UPDATECHECK_BRANCH'] = 'stable';
  96 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400;
  97
  98
  99 /*
 100  * Plugin configuration
 101  *
 102  * Warning: order matters!
 103  *
 104  * These settings may be be overriden in:
 105  *  - data/config.php
 106  *  - each plugin's configuration file
 107  */
 108 //$GLOBALS['config']['ENABLED_PLUGINS'] = array(
 109 //    'qrcode', 'archiveorg', 'readityourself', 'demo_plugin', 'playvideos',
 110 //    'wallabag', 'markdown', 'addlink_toolbar',
 111 //);
 112 $GLOBALS['config']['ENABLED_PLUGINS'] = array('qrcode');
 113
 114 //$GLOBALS['plugins']['WALLABAG_URL'] = 'https://demo.wallabag.org/';
 115
 116 // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
 117 $GLOBALS['config']['PUBSUBHUB_URL'] = '';
 118
 119 /*
 120  * PHP configuration
 121  */
 122 define('shaarli_version', '0.6.3');
 123
 124 // http://server.com/x/shaarli --> /shaarli/
 125 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
 126
 127 // High execution time in case of problematic imports/exports.
 128 ini_set('max_input_time','60');
 129
 130 // Try to set max upload file size and read
 131 ini_set('memory_limit', '128M');
 132 ini_set('post_max_size', '16M');
 133 ini_set('upload_max_filesize', '16M');
 134
 135 // See all error except warnings
 136 error_reporting(E_ALL^E_WARNING);
 137 // See all errors (for debugging only)
 138 //error_reporting(-1);
 139
 140 /*
 141  * User configuration
 142  */
 143 if (is_file($GLOBALS['config']['CONFIG_FILE'])) {
 144     require_once $GLOBALS['config']['CONFIG_FILE'];
 145 }
 146
 147 // Shaarli library
 148 require_once 'application/ApplicationUtils.php';
 149 require_once 'application/Cache.php';
 150 require_once 'application/CachedPage.php';
 151 require_once 'application/FileUtils.php';
 152 require_once 'application/HttpUtils.php';
 153 require_once 'application/LinkDB.php';
 154 require_once 'application/LinkFilter.php';
 155 require_once 'application/LinkUtils.php';
 156 require_once 'application/TimeZone.php';
 157 require_once 'application/Url.php';
 158 require_once 'application/Utils.php';
 159 require_once 'application/Config.php';
 160 require_once 'application/PluginManager.php';
 161 require_once 'application/Router.php';
 162
 163 // Ensure the PHP version is supported
 164 try {
 165     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
 166 } catch(Exception $exc) {
 167     header('Content-Type: text/plain; charset=utf-8');
 168     echo $exc->getMessage();
 169     exit;
 170 }
 171
 172 // Force cookie path (but do not change lifetime)
 173 $cookie = session_get_cookie_params();
 174 $cookiedir = '';
 175 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
 176     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
 177 }
 178 // Set default cookie expiration and path.
 179 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 180 // Set session parameters on server side.
 181 // If the user does not access any page within this time, his/her session is considered expired.
 182 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 183 // Use cookies to store session.
 184 ini_set('session.use_cookies', 1);
 185 // Force cookies for session (phpsessionID forbidden in URL).
 186 ini_set('session.use_only_cookies', 1);
 187 // Prevent PHP form using sessionID in URL if cookies are disabled.
 188 ini_set('session.use_trans_sid', false);
 189
 190 session_name('shaarli');
 191 // Start session if needed (Some server auto-start sessions).
 192 if (session_id() == '') {
 193     session_start();
 194 }
 195
 196 // Regenerate session ID if invalid or not defined in cookie.
 197 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 198     session_regenerate_id(true);
 199     $_COOKIE['shaarli'] = session_id();
 200 }
 201
 202 include "inc/rain.tpl.class.php"; //include Rain TPL
 203 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
 204 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
 205
 206 $pluginManager = PluginManager::getInstance();
 207 $pluginManager->load($GLOBALS['config']['ENABLED_PLUGINS']);
 208
 209 ob_start();  // Output buffering for the page cache.
 210
 211
 212 // In case stupid admin has left magic_quotes enabled in php.ini:
 213 if (get_magic_quotes_gpc())
 214 {
 215     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 216     $_POST = array_map('stripslashes_deep', $_POST);
 217     $_GET = array_map('stripslashes_deep', $_GET);
 218     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 219 }
 220
 221 // Prevent caching on client side or proxy: (yes, it's ugly)
 222 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 223 header("Cache-Control: no-store, no-cache, must-revalidate");
 224 header("Cache-Control: post-check=0, pre-check=0", false);
 225 header("Pragma: no-cache");
 226
 227 // Handling of old config file which do not have the new parameters.
 228 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(index_url($_SERVER));
 229 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 230 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 231 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 232 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 233 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 234 // I really need to rewrite Shaarli with a proper configuation manager.
 235
 236 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 237     // Ensure Shaarli has proper access to its resources
 238     $errors = ApplicationUtils::checkResourcePermissions($GLOBALS['config']);
 239
 240     if ($errors != array()) {
 241         $message = '<p>Insufficient permissions:</p><ul>';
 242
 243         foreach ($errors as $error) {
 244             $message .= '<li>'.$error.'</li>';
 245         }
 246         $message .= '</ul>';
 247
 248         header('Content-Type: text/html; charset=utf-8');
 249         echo $message;
 250         exit;
 251     }
 252
 253     // Display the installation form if no existing config is found
 254     install();
 255 }
 256
 257 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 258 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 259 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 260
 261 // a token depending of deployment salt, user password, and the current ip
 262 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 263
 264 autoLocale(); // Sniff browser language and set date format accordingly.
 265 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 266
 267 //==================================================================================================
 268 // Checking session state (i.e. is the user still logged in)
 269 //==================================================================================================
 270
 271 function setup_login_state() {
 272         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 273             return true;
 274         }
 275         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 276         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 277         if (!isset($GLOBALS['login'])) {
 278             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 279             $loginFailure = true;
 280         }
 281         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 282             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 283             !$loginFailure)
 284         {
 285             fillSessionInfo();
 286             $userIsLoggedIn = true;
 287         }
 288         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 289         if (empty($_SESSION['uid']) ||
 290             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 291             time() >= $_SESSION['expires_on'])
 292         {
 293             logout();
 294             $userIsLoggedIn = false;
 295             $loginFailure = true;
 296         }
 297         if (!empty($_SESSION['longlastingsession'])) {
 298             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 299         }
 300         else {
 301             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 302         }
 303         if (!$loginFailure) {
 304             $userIsLoggedIn = true;
 305         }
 306
 307         return $userIsLoggedIn;
 308 }
 309 $userIsLoggedIn = setup_login_state();
 310
 311
 312 // ------------------------------------------------------------------------------------------
 313 // Sniff browser language to display dates in the right format automatically.
 314 // (Note that is may not work on your server if the corresponding local is not installed.)
 315 function autoLocale()
 316 {
 317     $attempts = array('en_US'); // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 318     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 319     {   // (It's a bit crude, but it works very well. Preferred language is always presented first.)
 320         if (preg_match('/([a-z]{2})-?([a-z]{2})?/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) {
 321             $loc = $matches[1] . (!empty($matches[2]) ? '_' . strtoupper($matches[2]) : '');
 322             $attempts = array($loc.'.UTF-8', $loc, str_replace('_', '-', $loc).'.UTF-8', str_replace('_', '-', $loc),
 323                 $loc . '_' . strtoupper($loc).'.UTF-8', $loc . '_' . strtoupper($loc),
 324                 $loc . '_' . $loc.'.UTF-8', $loc . '_' . $loc, $loc . '-' . strtoupper($loc).'.UTF-8',
 325                 $loc . '-' . strtoupper($loc), $loc . '-' . $loc.'.UTF-8', $loc . '-' . $loc);
 326         }
 327     }
 328     setlocale(LC_TIME, $attempts);  // LC_TIME = Set local for date/time format only.
 329 }
 330
 331 // ------------------------------------------------------------------------------------------
 332 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 333 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 334 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 335 function pubsubhub()
 336 {
 337     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 338     {
 339        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 340        $topic_url = array (
 341                        index_url($_SERVER).'?do=atom',
 342                        index_url($_SERVER).'?do=rss'
 343                     );
 344        $p->publish_update($topic_url);
 345     }
 346 }
 347
 348 // ------------------------------------------------------------------------------------------
 349 // Session management
 350
 351 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 352 function allIPs()
 353 {
 354     $ip = $_SERVER["REMOTE_ADDR"];
 355     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 356     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 357     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 358     return $ip;
 359 }
 360
 361 function fillSessionInfo() {
 362         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 363         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 364         $_SESSION['username']=$GLOBALS['login'];
 365         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 366 }
 367
 368 // Check that user/password is correct.
 369 function check_auth($login,$password)
 370 {
 371     $hash = sha1($password.$login.$GLOBALS['salt']);
 372     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 373     {   // Login/password is correct.
 374                 fillSessionInfo();
 375         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login successful');
 376         return True;
 377     }
 378     logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login failed for user '.$login);
 379     return False;
 380 }
 381
 382 // Returns true if the user is logged in.
 383 function isLoggedIn()
 384 {
 385     global $userIsLoggedIn;
 386     return $userIsLoggedIn;
 387 }
 388
 389 // Force logout.
 390 function logout() {
 391     if (isset($_SESSION)) {
 392         unset($_SESSION['uid']);
 393         unset($_SESSION['ip']);
 394         unset($_SESSION['username']);
 395         unset($_SESSION['privateonly']);
 396     }
 397     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 398 }
 399
 400
 401 // ------------------------------------------------------------------------------------------
 402 // Brute force protection system
 403 // Several consecutive failed logins will ban the IP address for 30 minutes.
 404 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?>");
 405 include $GLOBALS['config']['IPBANS_FILENAME'];
 406 // Signal a failed login. Will ban the IP if too many failures:
 407 function ban_loginFailed()
 408 {
 409     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 410     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 411     $gb['FAILURES'][$ip]++;
 412     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 413     {
 414         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 415         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'IP address banned from login');
 416     }
 417     $GLOBALS['IPBANS'] = $gb;
 418     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 419 }
 420
 421 // Signals a successful login. Resets failed login counter.
 422 function ban_loginOk()
 423 {
 424     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 425     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 426     $GLOBALS['IPBANS'] = $gb;
 427     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 428 }
 429
 430 // Checks if the user CAN login. If 'true', the user can try to login.
 431 function ban_canLogin()
 432 {
 433     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 434     if (isset($gb['BANS'][$ip]))
 435     {
 436         // User is banned. Check if the ban has expired:
 437         if ($gb['BANS'][$ip]<=time())
 438         {   // Ban expired, user can try to login again.
 439             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Ban lifted.');
 440             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 441             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 442             return true; // Ban has expired, user can login.
 443         }
 444         return false; // User is banned.
 445     }
 446     return true; // User is not banned.
 447 }
 448
 449 // ------------------------------------------------------------------------------------------
 450 // Process login form: Check if login/password is correct.
 451 if (isset($_POST['login']))
 452 {
 453     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 454     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 455     {   // Login/password is OK.
 456         ban_loginOk();
 457         // If user wants to keep the session cookie even after the browser closes:
 458         if (!empty($_POST['longlastingsession']))
 459         {
 460                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 461             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 462             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 463
 464             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 465             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 466             // Note: Never forget the trailing slash on the cookie path!
 467             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 468         }
 469         else // Standard session expiration (=when browser closes)
 470         {
 471             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 472             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 473             session_regenerate_id(true);
 474         }
 475
 476         // Optional redirect after login:
 477         if (isset($_GET['post'])) {
 478             $uri = '?post='. urlencode($_GET['post']);
 479             foreach (array('description', 'source', 'title') as $param) {
 480                 if (!empty($_GET[$param])) {
 481                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 482                 }
 483             }
 484             header('Location: '. $uri);
 485             exit;
 486         }
 487
 488         if (isset($_GET['edit_link'])) {
 489             header('Location: ?edit_link='. escape($_GET['edit_link']));
 490             exit;
 491         }
 492
 493         if (isset($_POST['returnurl'])) {
 494             // Prevent loops over login screen.
 495             if (strpos($_POST['returnurl'], 'do=login') === false) {
 496                 header('Location: '. escape($_POST['returnurl']));
 497                 exit;
 498             }
 499         }
 500         header('Location: ?'); exit;
 501     }
 502     else
 503     {
 504         ban_loginFailed();
 505         $redir = '';
 506         if (isset($_GET['post'])) {
 507             $redir = '?post=' . urlencode($_GET['post']);
 508             foreach (array('description', 'source', 'title') as $param) {
 509                 if (!empty($_GET[$param])) {
 510                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 511                 }
 512             }
 513         }
 514         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 515         exit;
 516     }
 517 }
 518
 519 // ------------------------------------------------------------------------------------------
 520 // Misc utility functions:
 521
 522 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 523 function return_bytes($val)
 524 {
 525     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 526     switch($last)
 527     {
 528         case 'g': $val *= 1024;
 529         case 'm': $val *= 1024;
 530         case 'k': $val *= 1024;
 531     }
 532     return $val;
 533 }
 534
 535 // Try to determine max file size for uploads (POST).
 536 // Returns an integer (in bytes)
 537 function getMaxFileSize()
 538 {
 539     $size1 = return_bytes(ini_get('post_max_size'));
 540     $size2 = return_bytes(ini_get('upload_max_filesize'));
 541     // Return the smaller of two:
 542     $maxsize = min($size1,$size2);
 543     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 544     return $maxsize;
 545 }
 546
 547 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a timestamp (Unix epoch)
 548     (used to build the ADD_DATE attribute in Netscape-bookmarks file)
 549     PS: I could have used strptime(), but it does not exist on Windows. I'm too kind. */
 550 function linkdate2timestamp($linkdate)
 551 {
 552     if(strcmp($linkdate, '_000000') !== 0 || !$linkdate){
 553         $Y=$M=$D=$h=$m=$s=0;
 554         $r = sscanf($linkdate,'%4d%2d%2d_%2d%2d%2d',$Y,$M,$D,$h,$m,$s);
 555         return mktime($h,$m,$s,$M,$D,$Y);
 556     }
 557     return time();
 558 }
 559
 560 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a RFC822 date.
 561     (used to build the pubDate attribute in RSS feed.)  */
 562 function linkdate2rfc822($linkdate)
 563 {
 564     return date('r',linkdate2timestamp($linkdate)); // 'r' is for RFC822 date format.
 565 }
 566
 567 /*  Converts a linkdate time (YYYYMMDD_HHMMSS) of an article to a ISO 8601 date.
 568     (used to build the updated tags in ATOM feed.)  */
 569 function linkdate2iso8601($linkdate)
 570 {
 571     return date('c',linkdate2timestamp($linkdate)); // 'c' is for ISO 8601 date format.
 572 }
 573
 574 // ------------------------------------------------------------------------------------------
 575 // Token management for XSRF protection
 576 // Token should be used in any form which acts on data (create,update,delete,import...).
 577 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 578
 579 // Returns a token.
 580 function getToken()
 581 {
 582     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 583     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 584     return $rnd;
 585 }
 586
 587 // Tells if a token is OK. Using this function will destroy the token.
 588 // true=token is OK.
 589 function tokenOk($token)
 590 {
 591     if (isset($_SESSION['tokens'][$token]))
 592     {
 593         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 594         return true; // Token is OK.
 595     }
 596     return false; // Wrong token, or already used.
 597 }
 598
 599 // ------------------------------------------------------------------------------------------
 600 /* This class is in charge of building the final page.
 601    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 602    p = new pageBuilder;
 603    p.assign('myfield','myvalue');
 604    p.renderPage('mytemplate');
 605
 606 */
 607 class pageBuilder
 608 {
 609     private $tpl; // RainTPL template
 610
 611     function __construct()
 612     {
 613         $this->tpl = false;
 614     }
 615
 616     /**
 617      * Initialize all default tpl tags.
 618      */
 619     private function initialize()
 620     {
 621         $this->tpl = new RainTPL;
 622
 623         try {
 624             $version = ApplicationUtils::checkUpdate(
 625                 shaarli_version,
 626                 $GLOBALS['config']['UPDATECHECK_FILENAME'],
 627                 $GLOBALS['config']['UPDATECHECK_INTERVAL'],
 628                 $GLOBALS['config']['ENABLE_UPDATECHECK'],
 629                 isLoggedIn(),
 630                 $GLOBALS['config']['UPDATECHECK_BRANCH']
 631             );
 632             $this->tpl->assign('newVersion', escape($version));
 633             $this->tpl->assign('versionError', '');
 634
 635         } catch (Exception $exc) {
 636             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], $exc->getMessage());
 637             $this->tpl->assign('newVersion', '');
 638             $this->tpl->assign('versionError', escape($exc->getMessage()));
 639         }
 640
 641         $this->tpl->assign('feedurl', escape(index_url($_SERVER)));
 642         $searchcrits = ''; // Search criteria
 643         if (!empty($_GET['searchtags'])) {
 644             $searchcrits .= '&searchtags=' . urlencode($_GET['searchtags']);
 645         }
 646         elseif (!empty($_GET['searchterm'])) {
 647             $searchcrits .= '&searchterm=' . urlencode($_GET['searchterm']);
 648         }
 649         $this->tpl->assign('searchcrits', $searchcrits);
 650         $this->tpl->assign('source', index_url($_SERVER));
 651         $this->tpl->assign('version', shaarli_version);
 652         $this->tpl->assign('scripturl', index_url($_SERVER));
 653         $this->tpl->assign('pagetitle', 'Shaarli');
 654         $this->tpl->assign('privateonly', !empty($_SESSION['privateonly'])); // Show only private links?
 655         if (!empty($GLOBALS['title'])) {
 656             $this->tpl->assign('pagetitle', $GLOBALS['title']);
 657         }
 658         if (!empty($GLOBALS['titleLink'])) {
 659             $this->tpl->assign('titleLink', $GLOBALS['titleLink']);
 660         }
 661         if (!empty($GLOBALS['pagetitle'])) {
 662             $this->tpl->assign('pagetitle', $GLOBALS['pagetitle']);
 663         }
 664         $this->tpl->assign('shaarlititle', empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title']);
 665         if (!empty($GLOBALS['plugin_errors'])) {
 666             $this->tpl->assign('plugin_errors', $GLOBALS['plugin_errors']);
 667         }
 668     }
 669
 670     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 671     public function assign($what,$where)
 672     {
 673         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 674         $this->tpl->assign($what,$where);
 675     }
 676
 677     // Render a specific page (using a template).
 678     // e.g. pb.renderPage('picwall')
 679     public function renderPage($page)
 680     {
 681         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 682         $this->tpl->draw($page);
 683     }
 684
 685     /**
 686     * Render a 404 page (uses the template : tpl/404.tpl)
 687     *
 688     * usage : $PAGE->render404('The link was deleted')
 689     * @param string $message A messate to display what is not found
 690     */
 691     public function render404($message='The page you are trying to reach does not exist or has been deleted.') {
 692         header($_SERVER['SERVER_PROTOCOL'] . ' 404 Not Found');
 693         $this->tpl->assign('error_message', $message);
 694         $this->renderPage('404');
 695     }
 696 }
 697
 698 // ------------------------------------------------------------------------------------------
 699 // Output the last N links in RSS 2.0 format.
 700 function showRSS()
 701 {
 702     header('Content-Type: application/rss+xml; charset=utf-8');
 703
 704     // $usepermalink : If true, use permalink instead of final link.
 705     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=rss&permalinks
 706     // Also enabled through a config option
 707     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 708
 709     // Cache system
 710     $query = $_SERVER["QUERY_STRING"];
 711     $cache = new CachedPage(
 712         $GLOBALS['config']['PAGECACHE'],
 713         page_url($_SERVER),
 714         startsWith($query,'do=rss') && !isLoggedIn()
 715     );
 716     $cached = $cache->cachedVersion();
 717     if (! empty($cached)) {
 718         echo $cached;
 719         exit;
 720     }
 721
 722     // If cached was not found (or not usable), then read the database and build the response:
 723     $LINKSDB = new LinkDB(
 724         $GLOBALS['config']['DATASTORE'],
 725         isLoggedIn(),
 726         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 727         $GLOBALS['redirector']
 728     );
 729     // Read links from database (and filter private links if user it not logged in).
 730
 731     // Optionally filter the results:
 732     if (!empty($_GET['searchterm'])) {
 733         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
 734     }
 735     elseif (!empty($_GET['searchtags'])) {
 736         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
 737     }
 738     else {
 739         $linksToDisplay = $LINKSDB;
 740     }
 741
 742     $nblinksToDisplay = 50;  // Number of links to display.
 743     // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 744     if (!empty($_GET['nb'])) {
 745         $nblinksToDisplay = $_GET['nb'] == 'all' ? count($linksToDisplay) : max(intval($_GET['nb']), 1);
 746     }
 747
 748     $pageaddr = escape(index_url($_SERVER));
 749     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 750     echo '<channel><title>'.$GLOBALS['title'].'</title><link>'.$pageaddr.'</link>';
 751     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 752     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 753     {
 754         echo '<!-- PubSubHubbub Discovery -->';
 755         echo '<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 756         echo '<link rel="self" href="'.$pageaddr.'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 757         echo '<!-- End Of PubSubHubbub Discovery -->';
 758     }
 759     $i=0;
 760     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 761     while ($i<$nblinksToDisplay && $i<count($keys))
 762     {
 763         $link = $linksToDisplay[$keys[$i]];
 764         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 765         $rfc822date = linkdate2rfc822($link['linkdate']);
 766         $absurl = $link['url'];
 767         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 768         if ($usepermalinks===true)
 769             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 770         else
 771             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 772         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) echo '<pubDate>'.escape($rfc822date)."</pubDate>\n";
 773         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 774         {
 775             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.$pageaddr.'">'.$tag.'</category>'."\n"; }
 776         }
 777
 778         // Add permalink in description
 779         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 780         // If user wants permalinks first, put the final link in description
 781         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 782         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 783         echo '<description><![CDATA['.
 784             format_description($link['description'], $GLOBALS['redirector']) .
 785             $descriptionlink . ']]></description>' . "\n</item>\n";
 786         $i++;
 787     }
 788     echo '</channel></rss><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 789
 790     $cache->cache(ob_get_contents());
 791     ob_end_flush();
 792     exit;
 793 }
 794
 795 // ------------------------------------------------------------------------------------------
 796 // Output the last N links in ATOM format.
 797 function showATOM()
 798 {
 799     header('Content-Type: application/atom+xml; charset=utf-8');
 800
 801     // $usepermalink : If true, use permalink instead of final link.
 802     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
 803     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 804
 805     // Cache system
 806     $query = $_SERVER["QUERY_STRING"];
 807     $cache = new CachedPage(
 808         $GLOBALS['config']['PAGECACHE'],
 809         page_url($_SERVER),
 810         startsWith($query,'do=atom') && !isLoggedIn()
 811     );
 812     $cached = $cache->cachedVersion();
 813     if (!empty($cached)) {
 814         echo $cached;
 815         exit;
 816     }
 817
 818     // If cached was not found (or not usable), then read the database and build the response:
 819     // Read links from database (and filter private links if used it not logged in).
 820     $LINKSDB = new LinkDB(
 821         $GLOBALS['config']['DATASTORE'],
 822         isLoggedIn(),
 823         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 824         $GLOBALS['redirector']
 825     );
 826
 827     // Optionally filter the results:
 828     if (!empty($_GET['searchterm'])) {
 829         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
 830     }
 831     else if (!empty($_GET['searchtags'])) {
 832         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
 833     }
 834     else {
 835         $linksToDisplay = $LINKSDB;
 836     }
 837
 838     $nblinksToDisplay = 50;  // Number of links to display.
 839     // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 840     if (!empty($_GET['nb'])) {
 841         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max(intval($_GET['nb']), 1);
 842     }
 843
 844     $pageaddr=escape(index_url($_SERVER));
 845     $latestDate = '';
 846     $entries='';
 847     $i=0;
 848     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 849     while ($i<$nblinksToDisplay && $i<count($keys))
 850     {
 851         $link = $linksToDisplay[$keys[$i]];
 852         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 853         $iso8601date = linkdate2iso8601($link['linkdate']);
 854         $latestDate = max($latestDate,$iso8601date);
 855         $absurl = $link['url'];
 856         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 857         $entries.='<entry><title>'.$link['title'].'</title>';
 858         if ($usepermalinks===true)
 859             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
 860         else
 861             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
 862         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $entries.='<updated>'.escape($iso8601date).'</updated>';
 863
 864         // Add permalink in description
 865         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 866         // If user wants permalinks first, put the final link in description
 867         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 868         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 869
 870         $entries .= '<content type="html"><![CDATA['.
 871             format_description($link['description'], $GLOBALS['redirector']) .
 872             $descriptionlink . "]]></content>\n";
 873         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
 874         {
 875             foreach(explode(' ',$link['tags']) as $tag)
 876                 { $entries.='<category scheme="'.$pageaddr.'" term="'.$tag.'" />'."\n"; }
 877         }
 878         $entries.="</entry>\n";
 879         $i++;
 880     }
 881     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
 882     $feed.='<title>'.$GLOBALS['title'].'</title>';
 883     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.escape($latestDate).'</updated>';
 884     $feed.='<link rel="self" href="'.escape(server_url($_SERVER).$_SERVER["REQUEST_URI"]).'" />';
 885     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 886     {
 887         $feed.='<!-- PubSubHubbub Discovery -->';
 888         $feed.='<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
 889         $feed.='<!-- End Of PubSubHubbub Discovery -->';
 890     }
 891     $feed.='<author><name>'.$pageaddr.'</name><uri>'.$pageaddr.'</uri></author>';
 892     $feed.='<id>'.$pageaddr.'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
 893     $feed.=$entries;
 894     $feed.='</feed><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 895     echo $feed;
 896
 897     $cache->cache(ob_get_contents());
 898     ob_end_flush();
 899     exit;
 900 }
 901
 902 // ------------------------------------------------------------------------------------------
 903 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 904 // Gives the last 7 days (which have links).
 905 // This RSS feed cannot be filtered.
 906 function showDailyRSS() {
 907     // Cache system
 908     $query = $_SERVER["QUERY_STRING"];
 909     $cache = new CachedPage(
 910         $GLOBALS['config']['PAGECACHE'],
 911         page_url($_SERVER),
 912         startsWith($query,'do=dailyrss') && !isLoggedIn()
 913     );
 914     $cached = $cache->cachedVersion();
 915     if (!empty($cached)) {
 916         echo $cached;
 917         exit;
 918     }
 919
 920     // If cached was not found (or not usable), then read the database and build the response:
 921     // Read links from database (and filter private links if used it not logged in).
 922     $LINKSDB = new LinkDB(
 923         $GLOBALS['config']['DATASTORE'],
 924         isLoggedIn(),
 925         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 926         $GLOBALS['redirector']
 927     );
 928
 929     /* Some Shaarlies may have very few links, so we need to look
 930        back in time (rsort()) until we have enough days ($nb_of_days).
 931     */
 932     $linkdates = array();
 933     foreach ($LINKSDB as $linkdate => $value) {
 934         $linkdates[] = $linkdate;
 935     }
 936     rsort($linkdates);
 937     $nb_of_days = 7; // We take 7 days.
 938     $today = Date('Ymd');
 939     $days = array();
 940
 941     foreach ($linkdates as $linkdate) {
 942         $day = substr($linkdate, 0, 8); // Extract day (without time)
 943         if (strcmp($day,$today) < 0) {
 944             if (empty($days[$day])) {
 945                 $days[$day] = array();
 946             }
 947             $days[$day][] = $linkdate;
 948         }
 949
 950         if (count($days) > $nb_of_days) {
 951             break; // Have we collected enough days?
 952         }
 953     }
 954
 955     // Build the RSS feed.
 956     header('Content-Type: application/rss+xml; charset=utf-8');
 957     $pageaddr = escape(index_url($_SERVER));
 958     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 959     echo '<channel>';
 960     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 961     echo '<link>'. $pageaddr .'</link>';
 962     echo '<description>Daily shared links</description>';
 963     echo '<language>en-en</language>';
 964     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 965
 966     // For each day.
 967     foreach ($days as $day => $linkdates) {
 968         $daydate = linkdate2timestamp($day.'_000000'); // Full text date
 969         $rfc822date = linkdate2rfc822($day.'_000000');
 970         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 971
 972         // Build the HTML body of this RSS entry.
 973         $html = '';
 974         $href = '';
 975         $links = array();
 976
 977         // We pre-format some fields for proper output.
 978         foreach ($linkdates as $linkdate) {
 979             $l = $LINKSDB[$linkdate];
 980             $l['formatedDescription'] = format_description($l['description'], $GLOBALS['redirector']);
 981             $l['thumbnail'] = thumbnail($l['url']);
 982             $l['timestamp'] = linkdate2timestamp($l['linkdate']);
 983             if (startsWith($l['url'], '?')) {
 984                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 985             }
 986             $links[$linkdate] = $l;
 987         }
 988
 989         // Then build the HTML for this day:
 990         $tpl = new RainTPL;
 991         $tpl->assign('title', $GLOBALS['title']);
 992         $tpl->assign('daydate', $daydate);
 993         $tpl->assign('absurl', $absurl);
 994         $tpl->assign('links', $links);
 995         $tpl->assign('rfc822date', escape($rfc822date));
 996         $html = $tpl->draw('dailyrss', $return_string=true);
 997
 998         echo $html . PHP_EOL;
 999     }
1000     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
1001
1002     $cache->cache(ob_get_contents());
1003     ob_end_flush();
1004     exit;
1005 }
1006
1007 /**
1008  * Show the 'Daily' page.
1009  *
1010  * @param PageBuilder $pageBuilder Template engine wrapper.
1011  */
1012 function showDaily($pageBuilder)
1013 {
1014     $LINKSDB = new LinkDB(
1015         $GLOBALS['config']['DATASTORE'],
1016         isLoggedIn(),
1017         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1018         $GLOBALS['redirector']
1019     );
1020
1021     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
1022     if (isset($_GET['day'])) $day=$_GET['day'];
1023
1024     $days = $LINKSDB->days();
1025     $i = array_search($day,$days);
1026     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
1027     $previousday='';
1028     $nextday='';
1029     if ($i!==false)
1030     {
1031         if ($i>=1) $previousday=$days[$i-1];
1032         if ($i<count($days)-1) $nextday=$days[$i+1];
1033     }
1034
1035     try {
1036         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_DAY, $day);
1037     } catch (Exception $exc) {
1038         error_log($exc);
1039         $linksToDisplay = array();
1040     }
1041
1042     // We pre-format some fields for proper output.
1043     foreach($linksToDisplay as $key=>$link)
1044     {
1045
1046         $taglist = explode(' ',$link['tags']);
1047         uasort($taglist, 'strcasecmp');
1048         $linksToDisplay[$key]['taglist']=$taglist;
1049         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $GLOBALS['redirector']);
1050         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
1051         $linksToDisplay[$key]['timestamp'] = linkdate2timestamp($link['linkdate']);
1052     }
1053
1054     /* We need to spread the articles on 3 columns.
1055        I did not want to use a JavaScript lib like http://masonry.desandro.com/
1056        so I manually spread entries with a simple method: I roughly evaluate the
1057        height of a div according to title and description length.
1058     */
1059     $columns=array(array(),array(),array()); // Entries to display, for each column.
1060     $fill=array(0,0,0);  // Rough estimate of columns fill.
1061     foreach($linksToDisplay as $key=>$link)
1062     {
1063         // Roughly estimate length of entry (by counting characters)
1064         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
1065         // Description: 836 characters gives roughly 342 pixel height.
1066         // This is not perfect, but it's usually OK.
1067         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
1068         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
1069         // Then put in column which is the less filled:
1070         $smallest=min($fill); // find smallest value in array.
1071         $index=array_search($smallest,$fill); // find index of this smallest value.
1072         array_push($columns[$index],$link); // Put entry in this column.
1073         $fill[$index]+=$length;
1074     }
1075
1076     $data = array(
1077         'linksToDisplay' => $linksToDisplay,
1078         'linkcount' => count($LINKSDB),
1079         'cols' => $columns,
1080         'day' => linkdate2timestamp($day.'_000000'),
1081         'previousday' => $previousday,
1082         'nextday' => $nextday,
1083     );
1084     $pluginManager = PluginManager::getInstance();
1085     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
1086
1087     foreach ($data as $key => $value) {
1088         $pageBuilder->assign($key, $value);
1089     }
1090
1091     $pageBuilder->renderPage('daily');
1092     exit;
1093 }
1094
1095 // Renders the linklist
1096 function showLinkList($PAGE, $LINKSDB) {
1097     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1098     $PAGE->renderPage('linklist');
1099 }
1100
1101
1102 // ------------------------------------------------------------------------------------------
1103 // Render HTML page (according to URL parameters and user rights)
1104 function renderPage()
1105 {
1106     $LINKSDB = new LinkDB(
1107         $GLOBALS['config']['DATASTORE'],
1108         isLoggedIn(),
1109         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1110         $GLOBALS['redirector']
1111     );
1112
1113     $PAGE = new pageBuilder;
1114
1115     // Determine which page will be rendered.
1116     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
1117     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
1118
1119     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
1120     // Then assign generated data to RainTPL.
1121     $common_hooks = array(
1122         'header',
1123         'footer',
1124         'includes',
1125     );
1126     $pluginManager = PluginManager::getInstance();
1127     foreach($common_hooks as $name) {
1128         $plugin_data = array();
1129         $pluginManager->executeHooks('render_' . $name, $plugin_data,
1130             array(
1131                 'target' => $targetPage,
1132                 'loggedin' => isLoggedIn()
1133             )
1134         );
1135         $PAGE->assign('plugins_' . $name, $plugin_data);
1136     }
1137
1138     // -------- Display login form.
1139     if ($targetPage == Router::$PAGE_LOGIN)
1140     {
1141         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1142         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1143         $PAGE->assign('token',$token);
1144         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
1145         $PAGE->renderPage('loginform');
1146         exit;
1147     }
1148     // -------- User wants to logout.
1149     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1150     {
1151         invalidateCaches($GLOBALS['config']['PAGECACHE']);
1152         logout();
1153         header('Location: ?');
1154         exit;
1155     }
1156
1157     // -------- Picture wall
1158     if ($targetPage == Router::$PAGE_PICWALL)
1159     {
1160         // Optionally filter the results:
1161         if (!empty($_GET['searchterm'])) {
1162             $links = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $_GET['searchterm']);
1163         }
1164         elseif (! empty($_GET['searchtags'])) {
1165             $links = $LINKSDB->filter(LinkFilter::$FILTER_TAG, trim($_GET['searchtags']));
1166         }
1167         else {
1168             $links = $LINKSDB;
1169         }
1170
1171         $linksToDisplay = array();
1172
1173         // Get only links which have a thumbnail.
1174         foreach($links as $link)
1175         {
1176             $permalink='?'.escape(smallhash($link['linkdate']));
1177             $thumb=lazyThumbnail($link['url'],$permalink);
1178             if ($thumb!='') // Only output links which have a thumbnail.
1179             {
1180                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1181                 $linksToDisplay[]=$link; // Add to array.
1182             }
1183         }
1184
1185         $data = array(
1186             'linkcount' => count($LINKSDB),
1187             'linksToDisplay' => $linksToDisplay,
1188         );
1189         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
1190
1191         foreach ($data as $key => $value) {
1192             $PAGE->assign($key, $value);
1193         }
1194
1195         $PAGE->renderPage('picwall');
1196         exit;
1197     }
1198
1199     // -------- Tag cloud
1200     if ($targetPage == Router::$PAGE_TAGCLOUD)
1201     {
1202         $tags= $LINKSDB->allTags();
1203
1204         // We sort tags alphabetically, then choose a font size according to count.
1205         // First, find max value.
1206         $maxcount = 0;
1207         foreach ($tags as $value) {
1208             $maxcount = max($maxcount, $value);
1209         }
1210
1211         // Sort tags alphabetically: case insensitive, support locale if avalaible.
1212         uksort($tags, function($a, $b) {
1213             // Collator is part of PHP intl.
1214             if (class_exists('Collator')) {
1215                 $c = new Collator(setlocale(LC_ALL, 0));
1216                 return $c->compare($a, $b);
1217             } else {
1218                 return strcasecmp($a, $b);
1219             }
1220         });
1221
1222         $tagList=array();
1223         foreach($tags as $key=>$value)
1224         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1225         {
1226             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1227         }
1228
1229         $data = array(
1230             'linkcount' => count($LINKSDB),
1231             'tags' => $tagList,
1232         );
1233         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
1234
1235         foreach ($data as $key => $value) {
1236             $PAGE->assign($key, $value);
1237         }
1238
1239         $PAGE->renderPage('tagcloud');
1240         exit;
1241     }
1242
1243     // Daily page.
1244     if ($targetPage == Router::$PAGE_DAILY) {
1245         showDaily($PAGE);
1246     }
1247
1248     // Display openseach plugin (XML)
1249     if ($targetPage == Router::$PAGE_OPENSEARCH) {
1250         header('Content-Type: application/xml; charset=utf-8');
1251         $PAGE->assign('serverurl', index_url($_SERVER));
1252         $PAGE->renderPage('opensearch');
1253         exit;
1254     }
1255
1256     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1257     if (isset($_GET['addtag']))
1258     {
1259         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1260         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1261         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1262
1263         // Prevent redirection loop
1264         if (isset($params['addtag'])) {
1265             unset($params['addtag']);
1266         }
1267
1268         // Check if this tag is already in the search query and ignore it if it is.
1269         // Each tag is always separated by a space
1270         if (isset($params['searchtags'])) {
1271             $current_tags = explode(' ', $params['searchtags']);
1272         } else {
1273             $current_tags = array();
1274         }
1275         $addtag = true;
1276         foreach ($current_tags as $value) {
1277             if ($value === $_GET['addtag']) {
1278                 $addtag = false;
1279                 break;
1280             }
1281         }
1282         // Append the tag if necessary
1283         if (empty($params['searchtags'])) {
1284             $params['searchtags'] = trim($_GET['addtag']);
1285         }
1286         else if ($addtag) {
1287             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1288         }
1289
1290         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1291         header('Location: ?'.http_build_query($params));
1292         exit;
1293     }
1294
1295     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1296     if (isset($_GET['removetag'])) {
1297         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1298         if (empty($_SERVER['HTTP_REFERER'])) {
1299             header('Location: ?');
1300             exit;
1301         }
1302
1303         // In case browser does not send HTTP_REFERER
1304         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1305
1306         // Prevent redirection loop
1307         if (isset($params['removetag'])) {
1308             unset($params['removetag']);
1309         }
1310
1311         if (isset($params['searchtags'])) {
1312             $tags = explode(' ', $params['searchtags']);
1313             // Remove value from array $tags.
1314             $tags = array_diff($tags, array($_GET['removetag']));
1315             $params['searchtags'] = implode(' ',$tags);
1316
1317             if (empty($params['searchtags'])) {
1318                 unset($params['searchtags']);
1319             }
1320
1321             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1322         }
1323         header('Location: ?'.http_build_query($params));
1324         exit;
1325     }
1326
1327     // -------- User wants to change the number of links per page (linksperpage=...)
1328     if (isset($_GET['linksperpage'])) {
1329         if (is_numeric($_GET['linksperpage'])) {
1330             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1331         }
1332
1333         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1334         exit;
1335     }
1336
1337     // -------- User wants to see only private links (toggle)
1338     if (isset($_GET['privateonly'])) {
1339         if (empty($_SESSION['privateonly'])) {
1340             $_SESSION['privateonly'] = 1; // See only private links
1341         } else {
1342             unset($_SESSION['privateonly']); // See all links
1343         }
1344
1345         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1346         exit;
1347     }
1348
1349     // -------- Handle other actions allowed for non-logged in users:
1350     if (!isLoggedIn())
1351     {
1352         // User tries to post new link but is not logged in:
1353         // Show login screen, then redirect to ?post=...
1354         if (isset($_GET['post']))
1355         {
1356             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1357             exit;
1358         }
1359
1360                 // Same case as above except that user tried to access ?do=addlink without being logged in
1361                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1362                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1363                         header('Location: ?do=login&post=');
1364                         exit;
1365                 }
1366         showLinkList($PAGE, $LINKSDB);
1367         if (isset($_GET['edit_link'])) {
1368             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1369             exit;
1370         }
1371
1372         exit; // Never remove this one! All operations below are reserved for logged in user.
1373     }
1374
1375     // -------- All other functions are reserved for the registered user:
1376
1377     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1378     if ($targetPage == Router::$PAGE_TOOLS)
1379     {
1380         $data = array(
1381             'linkcount' => count($LINKSDB),
1382             'pageabsaddr' => index_url($_SERVER),
1383         );
1384         $pluginManager->executeHooks('render_tools', $data);
1385
1386         foreach ($data as $key => $value) {
1387             $PAGE->assign($key, $value);
1388         }
1389
1390         $PAGE->renderPage('tools');
1391         exit;
1392     }
1393
1394     // -------- User wants to change his/her password.
1395     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1396     {
1397         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1398         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1399         {
1400             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1401
1402             // Make sure old password is correct.
1403             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1404             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1405             // Save new password
1406             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1407             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1408             try {
1409                 writeConfig($GLOBALS, isLoggedIn());
1410             }
1411             catch(Exception $e) {
1412                 error_log(
1413                     'ERROR while writing config file after changing password.' . PHP_EOL .
1414                     $e->getMessage()
1415                 );
1416
1417                 // TODO: do not handle exceptions/errors in JS.
1418                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1419                 exit;
1420             }
1421             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1422             exit;
1423         }
1424         else // show the change password form.
1425         {
1426             $PAGE->assign('linkcount',count($LINKSDB));
1427             $PAGE->assign('token',getToken());
1428             $PAGE->renderPage('changepassword');
1429             exit;
1430         }
1431     }
1432
1433     // -------- User wants to change configuration
1434     if ($targetPage == Router::$PAGE_CONFIGURE)
1435     {
1436         if (!empty($_POST['title']) )
1437         {
1438             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1439             $tz = 'UTC';
1440             if (!empty($_POST['continent']) && !empty($_POST['city']))
1441                 if (isTimeZoneValid($_POST['continent'],$_POST['city']))
1442                     $tz = $_POST['continent'].'/'.$_POST['city'];
1443             $GLOBALS['timezone'] = $tz;
1444             $GLOBALS['title']=$_POST['title'];
1445             $GLOBALS['titleLink']=$_POST['titleLink'];
1446             $GLOBALS['redirector']=$_POST['redirector'];
1447             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1448             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1449             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1450             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1451             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1452             try {
1453                 writeConfig($GLOBALS, isLoggedIn());
1454             }
1455             catch(Exception $e) {
1456                 error_log(
1457                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1458                     $e->getMessage()
1459                 );
1460
1461                 // TODO: do not handle exceptions/errors in JS.
1462                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1463                 exit;
1464             }
1465             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1466             exit;
1467         }
1468         else // Show the configuration form.
1469         {
1470             $PAGE->assign('linkcount',count($LINKSDB));
1471             $PAGE->assign('token',getToken());
1472             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1473             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1474             list($timezone_form, $timezone_js) = generateTimeZoneForm($GLOBALS['timezone']);
1475             $PAGE->assign('timezone_form', $timezone_form);
1476             $PAGE->assign('timezone_js',$timezone_js);
1477             $PAGE->renderPage('configure');
1478             exit;
1479         }
1480     }
1481
1482     // -------- User wants to rename a tag or delete it
1483     if ($targetPage == Router::$PAGE_CHANGETAG)
1484     {
1485         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1486             $PAGE->assign('linkcount', count($LINKSDB));
1487             $PAGE->assign('token', getToken());
1488             $PAGE->assign('tags', $LINKSDB->allTags());
1489             $PAGE->renderPage('changetag');
1490             exit;
1491         }
1492
1493         if (!tokenOk($_POST['token'])) {
1494             die('Wrong token.');
1495         }
1496
1497         // Delete a tag:
1498         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1499             $needle=trim($_POST['fromtag']);
1500             // True for case-sensitive tag search.
1501             $linksToAlter = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $needle, true);
1502             foreach($linksToAlter as $key=>$value)
1503             {
1504                 $tags = explode(' ',trim($value['tags']));
1505                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1506                 $value['tags']=trim(implode(' ',$tags));
1507                 $LINKSDB[$key]=$value;
1508             }
1509             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1510             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1511             exit;
1512         }
1513
1514         // Rename a tag:
1515         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1516             $needle=trim($_POST['fromtag']);
1517             // True for case-sensitive tag search.
1518             $linksToAlter = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $needle, true);
1519             foreach($linksToAlter as $key=>$value)
1520             {
1521                 $tags = explode(' ',trim($value['tags']));
1522                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1523                 $value['tags']=trim(implode(' ',$tags));
1524                 $LINKSDB[$key]=$value;
1525             }
1526             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1527             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1528             exit;
1529         }
1530     }
1531
1532     // -------- User wants to add a link without using the bookmarklet: Show form.
1533     if ($targetPage == Router::$PAGE_ADDLINK)
1534     {
1535         $PAGE->assign('linkcount',count($LINKSDB));
1536         $PAGE->renderPage('addlink');
1537         exit;
1538     }
1539
1540     // -------- User clicked the "Save" button when editing a link: Save link to database.
1541     if (isset($_POST['save_edit']))
1542     {
1543         if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1544         $tags = trim(preg_replace('/\s\s+/',' ', $_POST['lf_tags'])); // Remove multiple spaces.
1545         $tags = implode(' ', array_unique(explode(' ', $tags))); // Remove duplicates.
1546         $linkdate=$_POST['lf_linkdate'];
1547         $url = trim($_POST['lf_url']);
1548         if (!startsWith($url,'http:') && !startsWith($url,'https:') && !startsWith($url,'ftp:') && !startsWith($url,'magnet:') && !startsWith($url,'?') && !startsWith($url,'javascript:'))
1549             $url = 'http://'.$url;
1550         $link = array('title'=>trim($_POST['lf_title']),'url'=>$url,'description'=>trim($_POST['lf_description']),'private'=>(isset($_POST['lf_private']) ? 1 : 0),
1551                       'linkdate'=>$linkdate,'tags'=>str_replace(',',' ',$tags));
1552         if ($link['title']=='') $link['title']=$link['url']; // If title is empty, use the URL as title.
1553
1554         $pluginManager->executeHooks('save_link', $link);
1555
1556         $LINKSDB[$linkdate] = $link;
1557         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1558         pubsubhub();
1559
1560         // If we are called from the bookmarklet, we must close the popup:
1561         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1562             echo '<script>self.close();</script>';
1563             exit;
1564         }
1565
1566         $returnurl = !empty($_POST['returnurl']) ? escape($_POST['returnurl']): '?';
1567         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1568         $location .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1569         header('Location: '. $location); // After saving the link, redirect to the page the user was on.
1570         exit;
1571     }
1572
1573     // -------- User clicked the "Cancel" button when editing a link.
1574     if (isset($_POST['cancel_edit']))
1575     {
1576         // If we are called from the bookmarklet, we must close the popup:
1577         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1578         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1579         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1580         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1581         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1582         exit;
1583     }
1584
1585     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1586     if (isset($_POST['delete_link']))
1587     {
1588         if (!tokenOk($_POST['token'])) die('Wrong token.');
1589         // We do not need to ask for confirmation:
1590         // - confirmation is handled by JavaScript
1591         // - we are protected from XSRF by the token.
1592         $linkdate=$_POST['lf_linkdate'];
1593
1594         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1595
1596         unset($LINKSDB[$linkdate]);
1597         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // save to disk
1598
1599         // If we are called from the bookmarklet, we must close the popup:
1600         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1601         // Pick where we're going to redirect
1602         // =============================================================
1603         // Basically, we can't redirect to where we were previously if it was a permalink
1604         // or an edit_link, because it would 404.
1605         // Cases:
1606         //    - /             : nothing in $_GET, redirect to self
1607         //    - /?page        : redirect to self
1608         //    - /?searchterm  : redirect to self (there might be other links)
1609         //    - /?searchtags  : redirect to self
1610         //    - /permalink    : redirect to / (the link does not exist anymore)
1611         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1612         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1613         // redirect is not satisfied, and only then redirect to /
1614         $location = "?";
1615         // Self redirection
1616         if (count($_GET) == 0
1617             || isset($_GET['page'])
1618             || isset($_GET['searchterm'])
1619             || isset($_GET['searchtags'])
1620         ) {
1621             if (isset($_POST['returnurl'])) {
1622                 $location = $_POST['returnurl']; // Handle redirects given by the form
1623             } else {
1624                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1625             }
1626         }
1627
1628         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1629         exit;
1630     }
1631
1632     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1633     if (isset($_GET['edit_link']))
1634     {
1635         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1636         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1637         $data = array(
1638             'linkcount' => count($LINKSDB),
1639             'link' => $link,
1640             'link_is_new' => false,
1641             'token' => getToken(),
1642             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1643             'tags' => $LINKSDB->allTags(),
1644         );
1645         $pluginManager->executeHooks('render_editlink', $data);
1646
1647         foreach ($data as $key => $value) {
1648             $PAGE->assign($key, $value);
1649         }
1650
1651         $PAGE->renderPage('editlink');
1652         exit;
1653     }
1654
1655     // -------- User want to post a new link: Display link edit form.
1656     if (isset($_GET['post'])) {
1657         $url = cleanup_url(escape($_GET['post']));
1658
1659         $link_is_new = false;
1660         // Check if URL is not already in database (in this case, we will edit the existing link)
1661         $link = $LINKSDB->getLinkFromUrl($url);
1662         if (!$link)
1663         {
1664             $link_is_new = true;
1665             $linkdate = strval(date('Ymd_His'));
1666             // Get title if it was provided in URL (by the bookmarklet).
1667             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1668             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1669             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1670             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1671             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1672             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1673             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1674                 // Short timeout to keep the application responsive
1675                 list($headers, $content) = get_http_response($url, 4);
1676                 if (strpos($headers[0], '200 OK') !== false) {
1677                     // Retrieve charset.
1678                     $charset = get_charset($headers, $content);
1679                     // Extract title.
1680                     $title = html_extract_title($content);
1681                     // Re-encode title in utf-8 if necessary.
1682                     if (! empty($title) && $charset != 'utf-8') {
1683                         $title = mb_convert_encoding($title, $charset, 'utf-8');
1684                     }
1685                 }
1686             }
1687
1688             if ($url == '') {
1689                 $url = '?' . smallHash($linkdate);
1690                 $title = 'Note: ';
1691             }
1692
1693             $link = array(
1694                 'linkdate' => $linkdate,
1695                 'title' => $title,
1696                 'url' => $url,
1697                 'description' => $description,
1698                 'tags' => $tags,
1699                 'private' => $private
1700             );
1701         }
1702
1703         $data = array(
1704             'linkcount' => count($LINKSDB),
1705             'link' => $link,
1706             'link_is_new' => $link_is_new,
1707             'token' => getToken(), // XSRF protection.
1708             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1709             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1710             'tags' => $LINKSDB->allTags(),
1711         );
1712         $pluginManager->executeHooks('render_editlink', $data);
1713
1714         foreach ($data as $key => $value) {
1715             $PAGE->assign($key, $value);
1716         }
1717
1718         $PAGE->renderPage('editlink');
1719         exit;
1720     }
1721
1722     // -------- Export as Netscape Bookmarks HTML file.
1723     if ($targetPage == Router::$PAGE_EXPORT)
1724     {
1725         if (empty($_GET['what']))
1726         {
1727             $PAGE->assign('linkcount',count($LINKSDB));
1728             $PAGE->renderPage('export');
1729             exit;
1730         }
1731         $exportWhat=$_GET['what'];
1732         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1733
1734         header('Content-Type: text/html; charset=utf-8');
1735         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1736         $currentdate=date('Y/m/d H:i:s');
1737         echo <<<HTML
1738 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1739 <!-- This is an automatically generated file.
1740      It will be read and overwritten.
1741      DO NOT EDIT! -->
1742 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1743 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1744 <TITLE>Bookmarks</TITLE>
1745 <H1>Bookmarks</H1>
1746 HTML;
1747         foreach($LINKSDB as $link)
1748         {
1749             if ($exportWhat=='all' ||
1750                ($exportWhat=='private' && $link['private']!=0) ||
1751                ($exportWhat=='public' && $link['private']==0))
1752             {
1753                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.linkdate2timestamp($link['linkdate']).'" PRIVATE="'.$link['private'].'"';
1754                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1755                 echo '>'.$link['title']."</A>\n";
1756                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1757             }
1758         }
1759                 exit;
1760     }
1761
1762     // -------- User is uploading a file for import
1763     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1764     {
1765         // If file is too big, some form field may be missing.
1766         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1767         {
1768             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1769             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1770             exit;
1771         }
1772         if (!tokenOk($_POST['token'])) die('Wrong token.');
1773         importFile();
1774         exit;
1775     }
1776
1777     // -------- Show upload/import dialog:
1778     if ($targetPage == Router::$PAGE_IMPORT)
1779     {
1780         $PAGE->assign('linkcount',count($LINKSDB));
1781         $PAGE->assign('token',getToken());
1782         $PAGE->assign('maxfilesize',getMaxFileSize());
1783         $PAGE->renderPage('import');
1784         exit;
1785     }
1786
1787     // Plugin administration page
1788     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1789         $pluginMeta = $pluginManager->getPluginsMeta();
1790
1791         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1792         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1793         // Load parameters.
1794         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $GLOBALS['plugins']);
1795         uasort(
1796             $enabledPlugins,
1797             function($a, $b) { return $a['order'] - $b['order']; }
1798         );
1799         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1800
1801         $PAGE->assign('enabledPlugins', $enabledPlugins);
1802         $PAGE->assign('disabledPlugins', $disabledPlugins);
1803         $PAGE->renderPage('pluginsadmin');
1804         exit;
1805     }
1806
1807     // Plugin administration form action
1808     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1809         try {
1810             if (isset($_POST['parameters_form'])) {
1811                 unset($_POST['parameters_form']);
1812                 foreach ($_POST as $param => $value) {
1813                     $GLOBALS['plugins'][$param] = escape($value);
1814                 }
1815             }
1816             else {
1817                 $GLOBALS['config']['ENABLED_PLUGINS'] = save_plugin_config($_POST);
1818             }
1819             writeConfig($GLOBALS, isLoggedIn());
1820         }
1821         catch (Exception $e) {
1822             error_log(
1823                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1824                 $e->getMessage()
1825             );
1826
1827             // TODO: do not handle exceptions/errors in JS.
1828             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=pluginsadmin\';</script>';
1829             exit;
1830         }
1831         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1832         exit;
1833     }
1834
1835     // -------- Otherwise, simply display search form and links:
1836     showLinkList($PAGE, $LINKSDB);
1837     exit;
1838 }
1839
1840 // -----------------------------------------------------------------------------------------------
1841 // Process the import file form.
1842 function importFile()
1843 {
1844     if (!isLoggedIn()) { die('Not allowed.'); }
1845     $LINKSDB = new LinkDB(
1846         $GLOBALS['config']['DATASTORE'],
1847         isLoggedIn(),
1848         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1849         $GLOBALS['redirector']
1850     );
1851     $filename=$_FILES['filetoupload']['name'];
1852     $filesize=$_FILES['filetoupload']['size'];
1853     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1854     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1855     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1856     $import_count=0;
1857
1858     // Sniff file type:
1859     $type='unknown';
1860     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1861
1862     // Then import the bookmarks.
1863     if ($type=='netscape')
1864     {
1865         // This is a standard Netscape-style bookmark file.
1866         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1867         foreach(explode('<DT>',$data) as $html) // explode is very fast
1868         {
1869             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1870             $d = explode('<DD>',$html);
1871             if (startswith($d[0],'<A '))
1872             {
1873                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1874                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1875                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1876                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1877                 $raw_add_date=0;
1878                 foreach($matches as $m)
1879                 {
1880                     $attr=$m[1]; $value=$m[2];
1881                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1882                     elseif ($attr=='ADD_DATE')
1883                     {
1884                         $raw_add_date=intval($value);
1885                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1886                     }
1887                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1888                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1889                 }
1890                 if ($link['url']!='')
1891                 {
1892                     if ($private==1) $link['private']=1;
1893                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1894                     if ($dblink==false)
1895                     {  // Link not in database, let's import it...
1896                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1897
1898                        // Make sure date/time is not already used by another link.
1899                        // (Some bookmark files have several different links with the same ADD_DATE)
1900                        // We increment date by 1 second until we find a date which is not used in DB.
1901                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1902                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1903                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1904                        $LINKSDB[$link['linkdate']] = $link;
1905                        $import_count++;
1906                     }
1907                     else // Link already present in database.
1908                     {
1909                         if ($overwrite)
1910                         {   // If overwrite is required, we import link data, except date/time.
1911                             $link['linkdate']=$dblink['linkdate'];
1912                             $LINKSDB[$link['linkdate']] = $link;
1913                             $import_count++;
1914                         }
1915                     }
1916
1917                 }
1918             }
1919         }
1920         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1921
1922         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1923     }
1924     else
1925     {
1926         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1927     }
1928 }
1929
1930 // -----------------------------------------------------------------------------------------------
1931 // Template for the list of links (<div id="linklist">)
1932 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1933 function buildLinkList($PAGE,$LINKSDB)
1934 {
1935     // ---- Filter link database according to parameters
1936     $search_type = '';
1937     $search_crits = '';
1938     $privateonly = !empty($_SESSION['privateonly']) ? true : false;
1939
1940     // Fulltext search
1941     if (isset($_GET['searchterm'])) {
1942         $search_crits = escape(trim($_GET['searchterm']));
1943         $search_type = LinkFilter::$FILTER_TEXT;
1944         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits, false, $privateonly);
1945     }
1946     // Search by tag
1947     elseif (isset($_GET['searchtags'])) {
1948         $search_crits = explode(' ', escape(trim($_GET['searchtags'])));
1949         $search_type = LinkFilter::$FILTER_TAG;
1950         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits, false, $privateonly);
1951     }
1952     // Detect smallHashes in URL.
1953     elseif (isset($_SERVER['QUERY_STRING'])
1954         && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/', $_SERVER['QUERY_STRING'])) {
1955         $search_type = LinkFilter::$FILTER_HASH;
1956         $search_crits = substr(trim($_SERVER["QUERY_STRING"], '/'), 0, 6);
1957         $linksToDisplay = $LINKSDB->filter($search_type, $search_crits);
1958
1959         if (count($linksToDisplay) == 0) {
1960             $PAGE->render404('The link you are trying to reach does not exist or has been deleted.');
1961             exit;
1962         }
1963     }
1964     // Otherwise, display without filtering.
1965     else {
1966         $linksToDisplay = $LINKSDB->filter('', '', false, $privateonly);
1967     }
1968
1969     // ---- Handle paging.
1970     $keys = array();
1971     foreach ($linksToDisplay as $key => $value) {
1972         $keys[] = $key;
1973     }
1974
1975     // If there is only a single link, we change on-the-fly the title of the page.
1976     if (count($linksToDisplay) == 1) {
1977         $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
1978     }
1979
1980     // Select articles according to paging.
1981     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1982     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1983     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1984     $page = $page < 1 ? 1 : $page;
1985     $page = $page > $pagecount ? $pagecount : $page;
1986     // Start index.
1987     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1988     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1989     $linkDisp = array();
1990     while ($i<$end && $i<count($keys))
1991     {
1992         $link = $linksToDisplay[$keys[$i]];
1993         $link['description'] = format_description($link['description'], $GLOBALS['redirector']);
1994         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
1995         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
1996         $link['timestamp'] = linkdate2timestamp($link['linkdate']);
1997         $taglist = explode(' ', $link['tags']);
1998         uasort($taglist, 'strcasecmp');
1999         $link['taglist'] = $taglist;
2000         $link['shorturl'] = smallHash($link['linkdate']);
2001         // Check for both signs of a note: starting with ? and 7 chars long.
2002         if ($link['url'][0] === '?' &&
2003             strlen($link['url']) === 7) {
2004             $link['url'] = index_url($_SERVER) . $link['url'];
2005         }
2006
2007         $linkDisp[$keys[$i]] = $link;
2008         $i++;
2009     }
2010
2011     // Compute paging navigation
2012     $searchterm = empty($_GET['searchterm']) ? '' : '&searchterm=' . $_GET['searchterm'];
2013     $searchtags = empty($_GET['searchtags']) ? '' : '&searchtags=' . $_GET['searchtags'];
2014     $previous_page_url = '';
2015     if ($i != count($keys)) {
2016         $previous_page_url = '?page=' . ($page+1) . $searchterm . $searchtags;
2017     }
2018     $next_page_url='';
2019     if ($page>1) {
2020         $next_page_url = '?page=' . ($page-1) . $searchterm . $searchtags;
2021     }
2022
2023     $token = '';
2024     if (isLoggedIn()) {
2025         $token = getToken();
2026     }
2027
2028     // Fill all template fields.
2029     $data = array(
2030         'linkcount' => count($LINKSDB),
2031         'previous_page_url' => $previous_page_url,
2032         'next_page_url' => $next_page_url,
2033         'page_current' => $page,
2034         'page_max' => $pagecount,
2035         'result_count' => count($linksToDisplay),
2036         'search_type' => $search_type,
2037         'search_crits' => $search_crits,
2038         'redirector' => empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'],  // Optional redirector URL.
2039         'token' => $token,
2040         'links' => $linkDisp,
2041         'tags' => $LINKSDB->allTags(),
2042     );
2043     // FIXME! temporary fix - see #399.
2044     if (!empty($GLOBALS['pagetitle']) && count($linkDisp) == 1) {
2045         $data['pagetitle'] = $GLOBALS['pagetitle'];
2046     }
2047
2048     $pluginManager = PluginManager::getInstance();
2049     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
2050
2051     foreach ($data as $key => $value) {
2052         $PAGE->assign($key, $value);
2053     }
2054
2055     return;
2056 }
2057
2058 // Compute the thumbnail for a link.
2059 //
2060 // With a link to the original URL.
2061 // Understands various services (youtube.com...)
2062 // Input: $url = URL for which the thumbnail must be found.
2063 //        $href = if provided, this URL will be followed instead of $url
2064 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
2065 // Some of them may be missing.
2066 // Return an empty array if no thumbnail available.
2067 function computeThumbnail($url,$href=false)
2068 {
2069     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
2070     if ($href==false) $href=$url;
2071
2072     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
2073     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
2074     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
2075     $domain = parse_url($url,PHP_URL_HOST);
2076     if ($domain=='youtube.com' || $domain=='www.youtube.com')
2077     {
2078         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
2079         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
2080                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2081     }
2082     if ($domain=='youtu.be') // Youtube short links
2083     {
2084         $path = parse_url($url,PHP_URL_PATH);
2085         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
2086                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2087     }
2088     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
2089     {
2090         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
2091         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
2092                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
2093     }
2094
2095     if ($domain=='imgur.com')
2096     {
2097         $path = parse_url($url,PHP_URL_PATH);
2098         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
2099         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
2100                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2101         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
2102                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2103
2104         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
2105                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2106     }
2107     if ($domain=='i.imgur.com')
2108     {
2109         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
2110         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
2111                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2112     }
2113     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
2114     {
2115         if (strpos($url,'dailymotion.com/video/')!==false)
2116         {
2117             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
2118             return array('src'=>$thumburl,
2119                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
2120         }
2121     }
2122     if (endsWith($domain,'.imageshack.us'))
2123     {
2124         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2125         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2126         {
2127             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
2128             return array('src'=>$thumburl,
2129                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
2130         }
2131     }
2132
2133     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
2134     // So we deport the thumbnail generation in order not to slow down page generation
2135     // (and we also cache the thumbnail)
2136
2137     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
2138
2139     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
2140         || $domain=='vimeo.com'
2141         || $domain=='ted.com' || endsWith($domain,'.ted.com')
2142         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
2143     )
2144     {
2145         if ($domain=='vimeo.com')
2146         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
2147             $path = parse_url($url,PHP_URL_PATH);
2148             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
2149         }
2150         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2151         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
2152             $path = parse_url($url,PHP_URL_PATH);
2153             if (!preg_match('!/\d+.+?!',$path)) return array();
2154         }
2155         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2156         {   // Make sure this TED URL points to a video (/talks/...)
2157             $path = parse_url($url,PHP_URL_PATH);
2158             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
2159         }
2160         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2161         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2162                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2163     }
2164
2165     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
2166     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
2167     // But using the extension will do.
2168     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2169     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2170     {
2171         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2172         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2173                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2174     }
2175     return array(); // No thumbnail.
2176
2177 }
2178
2179
2180 // Returns the HTML code to display a thumbnail for a link
2181 // with a link to the original URL.
2182 // Understands various services (youtube.com...)
2183 // Input: $url = URL for which the thumbnail must be found.
2184 //        $href = if provided, this URL will be followed instead of $url
2185 // Returns '' if no thumbnail available.
2186 function thumbnail($url,$href=false)
2187 {
2188     $t = computeThumbnail($url,$href);
2189     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2190
2191     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
2192     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2193     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2194     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2195     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2196     $html.='></a>';
2197     return $html;
2198 }
2199
2200 // Returns the HTML code to display a thumbnail for a link
2201 // for the picture wall (using lazy image loading)
2202 // Understands various services (youtube.com...)
2203 // Input: $url = URL for which the thumbnail must be found.
2204 //        $href = if provided, this URL will be followed instead of $url
2205 // Returns '' if no thumbnail available.
2206 function lazyThumbnail($url,$href=false)
2207 {
2208     $t = computeThumbnail($url,$href);
2209     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2210
2211     $html='<a href="'.escape($t['href']).'">';
2212
2213     // Lazy image
2214     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
2215
2216     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2217     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2218     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2219     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2220     $html.='>';
2221
2222     // No-JavaScript fallback.
2223     $html.='<noscript><img src="'.escape($t['src']).'"';
2224     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2225     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2226     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2227     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2228     $html.='></noscript></a>';
2229
2230     return $html;
2231 }
2232
2233
2234 // -----------------------------------------------------------------------------------------------
2235 // Installation
2236 // This function should NEVER be called if the file data/config.php exists.
2237 function install()
2238 {
2239     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2240     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2241
2242
2243     // This part makes sure sessions works correctly.
2244     // (Because on some hosts, session.save_path may not be set correctly,
2245     // or we may not have write access to it.)
2246     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2247     {   // Step 2: Check if data in session is correct.
2248         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2249         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2250         echo 'It currently points to '.session_save_path().'<br>';
2251         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2252         echo '<br><a href="?">Click to try again.</a></pre>';
2253         die;
2254     }
2255     if (!isset($_SESSION['session_tested']))
2256     {   // Step 1 : Try to store data in session and reload page.
2257         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2258         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
2259     }
2260     if (isset($_GET['test_session']))
2261     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2262         header('Location: '.index_url($_SERVER));
2263     }
2264
2265
2266     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2267     {
2268         $tz = 'UTC';
2269         if (!empty($_POST['continent']) && !empty($_POST['city'])) {
2270             if (isTimeZoneValid($_POST['continent'], $_POST['city'])) {
2271                 $tz = $_POST['continent'].'/'.$_POST['city'];
2272             }
2273         }
2274         $GLOBALS['timezone'] = $tz;
2275         // Everything is ok, let's create config file.
2276         $GLOBALS['login'] = $_POST['setlogin'];
2277         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2278         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2279         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(index_url($_SERVER)) : $_POST['title'] );
2280         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2281         try {
2282             writeConfig($GLOBALS, isLoggedIn());
2283         }
2284         catch(Exception $e) {
2285             error_log(
2286                     'ERROR while writing config file after installation.' . PHP_EOL .
2287                     $e->getMessage()
2288                 );
2289
2290             // TODO: do not handle exceptions/errors in JS.
2291             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2292             exit;
2293         }
2294         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2295         exit;
2296     }
2297
2298     // Display config form:
2299     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2300     $timezone_html = '';
2301     if ($timezone_form != '') {
2302         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2303     }
2304
2305     $PAGE = new pageBuilder;
2306     $PAGE->assign('timezone_html',$timezone_html);
2307     $PAGE->assign('timezone_js',$timezone_js);
2308     $PAGE->renderPage('install');
2309     exit;
2310 }
2311
2312 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2313    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2314    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2315    This function is called by passing the URL:
2316    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2317    [URL] is the URL of the link (e.g. a flickr page)
2318    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2319    The function below will fetch the image from the webservice and store it in the cache.
2320 */
2321 function genThumbnail()
2322 {
2323     // Make sure the parameters in the URL were generated by us.
2324     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2325     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2326
2327     // Let's see if we don't already have the image for this URL in the cache.
2328     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2329     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2330     {   // We have the thumbnail, just serve it:
2331         header('Content-Type: image/jpeg');
2332         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2333         return;
2334     }
2335     // We may also serve a blank image (if service did not respond)
2336     $blankname=hash('sha1',$_GET['url']).'.gif';
2337     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2338     {
2339         header('Content-Type: image/gif');
2340         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2341         return;
2342     }
2343
2344     // Otherwise, generate the thumbnail.
2345     $url = $_GET['url'];
2346     $domain = parse_url($url,PHP_URL_HOST);
2347
2348     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2349     {
2350         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2351         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2352
2353         // Is this a link to an image, or to a flickr page ?
2354         $imageurl='';
2355         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2356         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2357             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2358             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2359         }
2360         else // This is a flickr page (html)
2361         {
2362             // Get the flickr html page.
2363             list($headers, $content) = get_http_response($url, 20);
2364             if (strpos($headers[0], '200 OK') !== false)
2365             {
2366                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2367                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2368                 if (!empty($matches[1])) $imageurl=$matches[1];
2369
2370                 // In albums (and some other pages), the link rel="image_src" is not provided,
2371                 // but flickr provides:
2372                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2373                 if ($imageurl=='')
2374                 {
2375                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2376                     if (!empty($matches[1])) $imageurl=$matches[1];
2377                 }
2378             }
2379         }
2380
2381         if ($imageurl!='')
2382         {   // Let's download the image.
2383             // Image is 240x120, so 10 seconds to download should be enough.
2384             list($headers, $content) = get_http_response($imageurl, 10);
2385             if (strpos($headers[0], '200 OK') !== false) {
2386                 // Save image to cache.
2387                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/' . $thumbname, $content);
2388                 header('Content-Type: image/jpeg');
2389                 echo $content;
2390                 return;
2391             }
2392         }
2393     }
2394
2395     elseif ($domain=='vimeo.com' )
2396     {
2397         // This is more complex: we have to perform a HTTP request, then parse the result.
2398         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2399         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2400         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2401         if (strpos($headers[0], '200 OK') !== false) {
2402             $t = unserialize($content);
2403             $imageurl = $t[0]['thumbnail_medium'];
2404             // Then we download the image and serve it to our client.
2405             list($headers, $content) = get_http_response($imageurl, 10);
2406             if (strpos($headers[0], '200 OK') !== false) {
2407                 // Save image to cache.
2408                 file_put_contents($GLOBALS['config']['CACHEDIR'] . '/' . $thumbname, $content);
2409                 header('Content-Type: image/jpeg');
2410                 echo $content;
2411                 return;
2412             }
2413         }
2414     }
2415
2416     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2417     {
2418         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2419         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2420         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2421         list($headers, $content) = get_http_response($url, 5);
2422         if (strpos($headers[0], '200 OK') !== false) {
2423             // Extract the link to the thumbnail
2424             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2425             if (!empty($matches[1]))
2426             {   // Let's download the image.
2427                 $imageurl=$matches[1];
2428                 // No control on image size, so wait long enough
2429                 list($headers, $content) = get_http_response($imageurl, 20);
2430                 if (strpos($headers[0], '200 OK') !== false) {
2431                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2432                     file_put_contents($filepath, $content); // Save image to cache.
2433                     if (resizeImage($filepath))
2434                     {
2435                         header('Content-Type: image/jpeg');
2436                         echo file_get_contents($filepath);
2437                         return;
2438                     }
2439                 }
2440             }
2441         }
2442     }
2443
2444     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2445     {
2446         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2447         // http://xkcd.com/327/
2448         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2449         list($headers, $content) = get_http_response($url, 5);
2450         if (strpos($headers[0], '200 OK') !== false) {
2451             // Extract the link to the thumbnail
2452             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2453             if (!empty($matches[1]))
2454             {   // Let's download the image.
2455                 $imageurl=$matches[1];
2456                 // No control on image size, so wait long enough
2457                 list($headers, $content) = get_http_response($imageurl, 20);
2458                 if (strpos($headers[0], '200 OK') !== false) {
2459                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2460                     // Save image to cache.
2461                     file_put_contents($filepath, $content);
2462                     if (resizeImage($filepath))
2463                     {
2464                         header('Content-Type: image/jpeg');
2465                         echo file_get_contents($filepath);
2466                         return;
2467                     }
2468                 }
2469             }
2470         }
2471     }
2472
2473     else
2474     {
2475         // For all other domains, we try to download the image and make a thumbnail.
2476         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2477         list($headers, $content) = get_http_response($url, 30);
2478         if (strpos($headers[0], '200 OK') !== false) {
2479             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2480             // Save image to cache.
2481             file_put_contents($filepath, $content);
2482             if (resizeImage($filepath))
2483             {
2484                 header('Content-Type: image/jpeg');
2485                 echo file_get_contents($filepath);
2486                 return;
2487             }
2488         }
2489     }
2490
2491
2492     // Otherwise, return an empty image (8x8 transparent gif)
2493     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2494     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2495     header('Content-Type: image/gif');
2496     echo $blankgif;
2497 }
2498
2499 // Make a thumbnail of the image (to width: 120 pixels)
2500 // Returns true if success, false otherwise.
2501 function resizeImage($filepath)
2502 {
2503     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2504
2505     // Trick: some stupid people rename GIF as JPEG... or else.
2506     // So we really try to open each image type whatever the extension is.
2507     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2508     $im=false;
2509     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2510     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2511     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2512     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2513     $w = imagesx($im);
2514     $h = imagesy($im);
2515     $ystart = 0; $yheight=$h;
2516     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2517     $nw = 120;   // Desired width
2518     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2519     // Resize image:
2520     $im2 = imagecreatetruecolor($nw,$nh);
2521     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2522     imageinterlace($im2,true); // For progressive JPEG.
2523     $tempname=$filepath.'_TEMP.jpg';
2524     imagejpeg($im2, $tempname, 90);
2525     imagedestroy($im);
2526     imagedestroy($im2);
2527     unlink($filepath);
2528     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2529     return true;
2530 }
2531
2532 try {
2533     mergeDeprecatedConfig($GLOBALS, isLoggedIn());
2534 } catch(Exception $e) {
2535     error_log(
2536         'ERROR while merging deprecated options.php file.' . PHP_EOL .
2537         $e->getMessage()
2538     );
2539 }
2540
2541 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2542 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2543 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2544 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2545 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2546 renderPage();
2547 ?>