index.php

   1 <?php
   2 /**
   3  * Shaarli v0.6.3 - Shaare your links...
   4  *
   5  * The personal, minimalist, super-fast, no-database Delicious clone.
   6  *
   7  * Friendly fork by the Shaarli community:
   8  *  - https://github.com/shaarli/Shaarli
   9  *
  10  * Original project by sebsauvage.net:
  11  *  - http://sebsauvage.net/wiki/doku.php?id=php:shaarli
  12  *  - https://github.com/sebsauvage/Shaarli
  13  *
  14  * Licence: http://www.opensource.org/licenses/zlib-license.php
  15  *
  16  * Requires: PHP 5.3.x
  17  */
  18
  19 // Set 'UTC' as the default timezone if it is not defined in php.ini
  20 // See http://php.net/manual/en/datetime.configuration.php#ini.date.timezone
  21 if (date_default_timezone_get() == '') {
  22     date_default_timezone_set('UTC');
  23 }
  24
  25 /* -----------------------------------------------------------------------------
  26  * Hardcoded parameters
  27  * You should not touch any code below (or at your own risks!)
  28  * (These parameters can be overwritten by editing the file /data/config.php)
  29  * -----------------------------------------------------------------------------
  30  */
  31
  32 /*
  33  * Shaarli directories & configuration files
  34  */
  35 // Data subdirectory
  36 $GLOBALS['config']['DATADIR'] = 'data';
  37
  38 // Main configuration file
  39 $GLOBALS['config']['CONFIG_FILE'] = $GLOBALS['config']['DATADIR'].'/config.php';
  40
  41 // Link datastore
  42 $GLOBALS['config']['DATASTORE'] = $GLOBALS['config']['DATADIR'].'/datastore.php';
  43
  44 // Banned IPs
  45 $GLOBALS['config']['IPBANS_FILENAME'] = $GLOBALS['config']['DATADIR'].'/ipbans.php';
  46
  47 // Processed updates file.
  48 $GLOBALS['config']['UPDATES_FILE'] = $GLOBALS['config']['DATADIR'].'/updates.txt';
  49
  50 // Access log
  51 $GLOBALS['config']['LOG_FILE'] = $GLOBALS['config']['DATADIR'].'/log.txt';
  52
  53 // For updates check of Shaarli
  54 $GLOBALS['config']['UPDATECHECK_FILENAME'] = $GLOBALS['config']['DATADIR'].'/lastupdatecheck.txt';
  55
  56 // Set ENABLE_UPDATECHECK to disabled by default.
  57 $GLOBALS['config']['ENABLE_UPDATECHECK'] = false;
  58
  59 // RainTPL cache directory (keep the trailing slash!)
  60 $GLOBALS['config']['RAINTPL_TMP'] = 'tmp/';
  61 // Raintpl template directory (keep the trailing slash!)
  62 $GLOBALS['config']['RAINTPL_TPL'] = 'tpl/';
  63
  64 // Thumbnail cache directory
  65 $GLOBALS['config']['CACHEDIR'] = 'cache';
  66
  67 // Atom & RSS feed cache directory
  68 $GLOBALS['config']['PAGECACHE'] = 'pagecache';
  69
  70 /*
  71  * Global configuration
  72  */
  73 // Ban IP after this many failures
  74 $GLOBALS['config']['BAN_AFTER'] = 4;
  75 // Ban duration for IP address after login failures (in seconds)
  76 $GLOBALS['config']['BAN_DURATION'] = 1800;
  77
  78 // Feed options
  79 // Enable RSS permalinks by default.
  80 // This corresponds to the default behavior of shaarli before this was added as an option.
  81 $GLOBALS['config']['ENABLE_RSS_PERMALINKS'] = true;
  82 // If true, an extra "ATOM feed" button will be displayed in the toolbar
  83 $GLOBALS['config']['SHOW_ATOM'] = false;
  84
  85 // Link display options
  86 $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = false;
  87 $GLOBALS['config']['HIDE_TIMESTAMPS'] = false;
  88 $GLOBALS['config']['LINKS_PER_PAGE'] = 20;
  89
  90 // Open Shaarli (true): anyone can add/edit/delete links without having to login
  91 $GLOBALS['config']['OPEN_SHAARLI'] = false;
  92
  93 // Thumbnails
  94 // Display thumbnails in links
  95 $GLOBALS['config']['ENABLE_THUMBNAILS'] = true;
  96 // Store thumbnails in a local cache
  97 $GLOBALS['config']['ENABLE_LOCALCACHE'] = true;
  98
  99 // Update check frequency for Shaarli. 86400 seconds=24 hours
 100 $GLOBALS['config']['UPDATECHECK_BRANCH'] = 'stable';
 101 $GLOBALS['config']['UPDATECHECK_INTERVAL'] = 86400;
 102
 103
 104 /*
 105  * Plugin configuration
 106  *
 107  * Warning: order matters!
 108  *
 109  * These settings may be be overriden in:
 110  *  - data/config.php
 111  *  - each plugin's configuration file
 112  */
 113 //$GLOBALS['config']['ENABLED_PLUGINS'] = array(
 114 //    'qrcode', 'archiveorg', 'readityourself', 'demo_plugin', 'playvideos',
 115 //    'wallabag', 'markdown', 'addlink_toolbar',
 116 //);
 117 $GLOBALS['config']['ENABLED_PLUGINS'] = array('qrcode');
 118
 119 // Initialize plugin parameters array.
 120 $GLOBALS['plugins'] = array();
 121
 122 // PubSubHubbub support. Put an empty string to disable, or put your hub url here to enable.
 123 $GLOBALS['config']['PUBSUBHUB_URL'] = '';
 124
 125 /*
 126  * PHP configuration
 127  */
 128 define('shaarli_version', '0.6.3');
 129
 130 // http://server.com/x/shaarli --> /shaarli/
 131 define('WEB_PATH', substr($_SERVER["REQUEST_URI"], 0, 1+strrpos($_SERVER["REQUEST_URI"], '/', 0)));
 132
 133 // High execution time in case of problematic imports/exports.
 134 ini_set('max_input_time','60');
 135
 136 // Try to set max upload file size and read
 137 ini_set('memory_limit', '128M');
 138 ini_set('post_max_size', '16M');
 139 ini_set('upload_max_filesize', '16M');
 140
 141 // See all error except warnings
 142 error_reporting(E_ALL^E_WARNING);
 143 // See all errors (for debugging only)
 144 //error_reporting(-1);
 145
 146 /*
 147  * User configuration
 148  */
 149 if (is_file($GLOBALS['config']['CONFIG_FILE'])) {
 150     require_once $GLOBALS['config']['CONFIG_FILE'];
 151 }
 152
 153 // Shaarli library
 154 require_once 'application/ApplicationUtils.php';
 155 require_once 'application/Cache.php';
 156 require_once 'application/CachedPage.php';
 157 require_once 'application/FileUtils.php';
 158 require_once 'application/HttpUtils.php';
 159 require_once 'application/LinkDB.php';
 160 require_once 'application/LinkFilter.php';
 161 require_once 'application/LinkUtils.php';
 162 require_once 'application/TimeZone.php';
 163 require_once 'application/Url.php';
 164 require_once 'application/Utils.php';
 165 require_once 'application/Config.php';
 166 require_once 'application/PluginManager.php';
 167 require_once 'application/Router.php';
 168 require_once 'application/Updater.php';
 169
 170 // Ensure the PHP version is supported
 171 try {
 172     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
 173 } catch(Exception $exc) {
 174     header('Content-Type: text/plain; charset=utf-8');
 175     echo $exc->getMessage();
 176     exit;
 177 }
 178
 179 // Force cookie path (but do not change lifetime)
 180 $cookie = session_get_cookie_params();
 181 $cookiedir = '';
 182 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
 183     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
 184 }
 185 // Set default cookie expiration and path.
 186 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 187 // Set session parameters on server side.
 188 // If the user does not access any page within this time, his/her session is considered expired.
 189 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 190 // Use cookies to store session.
 191 ini_set('session.use_cookies', 1);
 192 // Force cookies for session (phpsessionID forbidden in URL).
 193 ini_set('session.use_only_cookies', 1);
 194 // Prevent PHP form using sessionID in URL if cookies are disabled.
 195 ini_set('session.use_trans_sid', false);
 196
 197 session_name('shaarli');
 198 // Start session if needed (Some server auto-start sessions).
 199 if (session_id() == '') {
 200     session_start();
 201 }
 202
 203 // Regenerate session ID if invalid or not defined in cookie.
 204 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 205     session_regenerate_id(true);
 206     $_COOKIE['shaarli'] = session_id();
 207 }
 208
 209 include "inc/rain.tpl.class.php"; //include Rain TPL
 210 raintpl::$tpl_dir = $GLOBALS['config']['RAINTPL_TPL']; // template directory
 211 raintpl::$cache_dir = $GLOBALS['config']['RAINTPL_TMP']; // cache directory
 212
 213 $pluginManager = PluginManager::getInstance();
 214 $pluginManager->load($GLOBALS['config']['ENABLED_PLUGINS']);
 215
 216 ob_start();  // Output buffering for the page cache.
 217
 218
 219 // In case stupid admin has left magic_quotes enabled in php.ini:
 220 if (get_magic_quotes_gpc())
 221 {
 222     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 223     $_POST = array_map('stripslashes_deep', $_POST);
 224     $_GET = array_map('stripslashes_deep', $_GET);
 225     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 226 }
 227
 228 // Prevent caching on client side or proxy: (yes, it's ugly)
 229 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 230 header("Cache-Control: no-store, no-cache, must-revalidate");
 231 header("Cache-Control: post-check=0, pre-check=0", false);
 232 header("Pragma: no-cache");
 233
 234 // Handling of old config file which do not have the new parameters.
 235 if (empty($GLOBALS['title'])) $GLOBALS['title']='Shared links on '.escape(index_url($_SERVER));
 236 if (empty($GLOBALS['timezone'])) $GLOBALS['timezone']=date_default_timezone_get();
 237 if (empty($GLOBALS['redirector'])) $GLOBALS['redirector']='';
 238 if (empty($GLOBALS['disablesessionprotection'])) $GLOBALS['disablesessionprotection']=false;
 239 if (empty($GLOBALS['privateLinkByDefault'])) $GLOBALS['privateLinkByDefault']=false;
 240 if (empty($GLOBALS['titleLink'])) $GLOBALS['titleLink']='?';
 241 // I really need to rewrite Shaarli with a proper configuation manager.
 242
 243 if (! is_file($GLOBALS['config']['CONFIG_FILE'])) {
 244     // Ensure Shaarli has proper access to its resources
 245     $errors = ApplicationUtils::checkResourcePermissions($GLOBALS['config']);
 246
 247     if ($errors != array()) {
 248         $message = '<p>Insufficient permissions:</p><ul>';
 249
 250         foreach ($errors as $error) {
 251             $message .= '<li>'.$error.'</li>';
 252         }
 253         $message .= '</ul>';
 254
 255         header('Content-Type: text/html; charset=utf-8');
 256         echo $message;
 257         exit;
 258     }
 259
 260     // Display the installation form if no existing config is found
 261     install();
 262 }
 263
 264 $GLOBALS['title'] = !empty($GLOBALS['title']) ? escape($GLOBALS['title']) : '';
 265 $GLOBALS['titleLink'] = !empty($GLOBALS['titleLink']) ? escape($GLOBALS['titleLink']) : '';
 266 $GLOBALS['redirector'] = !empty($GLOBALS['redirector']) ? escape($GLOBALS['redirector']) : '';
 267
 268 // a token depending of deployment salt, user password, and the current ip
 269 define('STAY_SIGNED_IN_TOKEN', sha1($GLOBALS['hash'].$_SERVER["REMOTE_ADDR"].$GLOBALS['salt']));
 270
 271 autoLocale(); // Sniff browser language and set date format accordingly.
 272 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 273
 274 //==================================================================================================
 275 // Checking session state (i.e. is the user still logged in)
 276 //==================================================================================================
 277
 278 function setup_login_state() {
 279         if ($GLOBALS['config']['OPEN_SHAARLI']) {
 280             return true;
 281         }
 282         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 283         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 284         if (!isset($GLOBALS['login'])) {
 285             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 286             $loginFailure = true;
 287         }
 288         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 289             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 290             !$loginFailure)
 291         {
 292             fillSessionInfo();
 293             $userIsLoggedIn = true;
 294         }
 295         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 296         if (empty($_SESSION['uid']) ||
 297             ($GLOBALS['disablesessionprotection']==false && $_SESSION['ip']!=allIPs()) ||
 298             time() >= $_SESSION['expires_on'])
 299         {
 300             logout();
 301             $userIsLoggedIn = false;
 302             $loginFailure = true;
 303         }
 304         if (!empty($_SESSION['longlastingsession'])) {
 305             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 306         }
 307         else {
 308             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 309         }
 310         if (!$loginFailure) {
 311             $userIsLoggedIn = true;
 312         }
 313
 314         return $userIsLoggedIn;
 315 }
 316 $userIsLoggedIn = setup_login_state();
 317
 318
 319 // ------------------------------------------------------------------------------------------
 320 // Sniff browser language to display dates in the right format automatically.
 321 // (Note that is may not work on your server if the corresponding local is not installed.)
 322 function autoLocale()
 323 {
 324     $attempts = array('en_US'); // Default if browser does not send HTTP_ACCEPT_LANGUAGE
 325     if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) // e.g. "fr,fr-fr;q=0.8,en;q=0.5,en-us;q=0.3"
 326     {   // (It's a bit crude, but it works very well. Preferred language is always presented first.)
 327         if (preg_match('/([a-z]{2})-?([a-z]{2})?/i',$_SERVER['HTTP_ACCEPT_LANGUAGE'],$matches)) {
 328             $loc = $matches[1] . (!empty($matches[2]) ? '_' . strtoupper($matches[2]) : '');
 329             $attempts = array($loc.'.UTF-8', $loc, str_replace('_', '-', $loc).'.UTF-8', str_replace('_', '-', $loc),
 330                 $loc . '_' . strtoupper($loc).'.UTF-8', $loc . '_' . strtoupper($loc),
 331                 $loc . '_' . $loc.'.UTF-8', $loc . '_' . $loc, $loc . '-' . strtoupper($loc).'.UTF-8',
 332                 $loc . '-' . strtoupper($loc), $loc . '-' . $loc.'.UTF-8', $loc . '-' . $loc);
 333         }
 334     }
 335     setlocale(LC_TIME, $attempts);  // LC_TIME = Set local for date/time format only.
 336 }
 337
 338 // ------------------------------------------------------------------------------------------
 339 // PubSubHubbub protocol support (if enabled)  [UNTESTED]
 340 // (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 341 if (!empty($GLOBALS['config']['PUBSUBHUB_URL'])) include './publisher.php';
 342 function pubsubhub()
 343 {
 344     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 345     {
 346        $p = new Publisher($GLOBALS['config']['PUBSUBHUB_URL']);
 347        $topic_url = array (
 348                        index_url($_SERVER).'?do=atom',
 349                        index_url($_SERVER).'?do=rss'
 350                     );
 351        $p->publish_update($topic_url);
 352     }
 353 }
 354
 355 // ------------------------------------------------------------------------------------------
 356 // Session management
 357
 358 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 359 function allIPs()
 360 {
 361     $ip = $_SERVER["REMOTE_ADDR"];
 362     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 363     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 364     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 365     return $ip;
 366 }
 367
 368 function fillSessionInfo() {
 369         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 370         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 371         $_SESSION['username']=$GLOBALS['login'];
 372         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 373 }
 374
 375 // Check that user/password is correct.
 376 function check_auth($login,$password)
 377 {
 378     $hash = sha1($password.$login.$GLOBALS['salt']);
 379     if ($login==$GLOBALS['login'] && $hash==$GLOBALS['hash'])
 380     {   // Login/password is correct.
 381                 fillSessionInfo();
 382         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login successful');
 383         return True;
 384     }
 385     logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Login failed for user '.$login);
 386     return False;
 387 }
 388
 389 // Returns true if the user is logged in.
 390 function isLoggedIn()
 391 {
 392     global $userIsLoggedIn;
 393     return $userIsLoggedIn;
 394 }
 395
 396 // Force logout.
 397 function logout() {
 398     if (isset($_SESSION)) {
 399         unset($_SESSION['uid']);
 400         unset($_SESSION['ip']);
 401         unset($_SESSION['username']);
 402         unset($_SESSION['privateonly']);
 403     }
 404     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 405 }
 406
 407
 408 // ------------------------------------------------------------------------------------------
 409 // Brute force protection system
 410 // Several consecutive failed logins will ban the IP address for 30 minutes.
 411 if (!is_file($GLOBALS['config']['IPBANS_FILENAME'])) file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export(array('FAILURES'=>array(),'BANS'=>array()),true).";\n?>");
 412 include $GLOBALS['config']['IPBANS_FILENAME'];
 413 // Signal a failed login. Will ban the IP if too many failures:
 414 function ban_loginFailed()
 415 {
 416     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 417     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 418     $gb['FAILURES'][$ip]++;
 419     if ($gb['FAILURES'][$ip]>($GLOBALS['config']['BAN_AFTER']-1))
 420     {
 421         $gb['BANS'][$ip]=time()+$GLOBALS['config']['BAN_DURATION'];
 422         logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'IP address banned from login');
 423     }
 424     $GLOBALS['IPBANS'] = $gb;
 425     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 426 }
 427
 428 // Signals a successful login. Resets failed login counter.
 429 function ban_loginOk()
 430 {
 431     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 432     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 433     $GLOBALS['IPBANS'] = $gb;
 434     file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 435 }
 436
 437 // Checks if the user CAN login. If 'true', the user can try to login.
 438 function ban_canLogin()
 439 {
 440     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 441     if (isset($gb['BANS'][$ip]))
 442     {
 443         // User is banned. Check if the ban has expired:
 444         if ($gb['BANS'][$ip]<=time())
 445         {   // Ban expired, user can try to login again.
 446             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], 'Ban lifted.');
 447             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 448             file_put_contents($GLOBALS['config']['IPBANS_FILENAME'], "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>");
 449             return true; // Ban has expired, user can login.
 450         }
 451         return false; // User is banned.
 452     }
 453     return true; // User is not banned.
 454 }
 455
 456 // ------------------------------------------------------------------------------------------
 457 // Process login form: Check if login/password is correct.
 458 if (isset($_POST['login']))
 459 {
 460     if (!ban_canLogin()) die('I said: NO. You are banned for the moment. Go away.');
 461     if (isset($_POST['password']) && tokenOk($_POST['token']) && (check_auth($_POST['login'], $_POST['password'])))
 462     {   // Login/password is OK.
 463         ban_loginOk();
 464         // If user wants to keep the session cookie even after the browser closes:
 465         if (!empty($_POST['longlastingsession']))
 466         {
 467                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 468             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 469             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 470
 471             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 472             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 473             // Note: Never forget the trailing slash on the cookie path!
 474             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 475         }
 476         else // Standard session expiration (=when browser closes)
 477         {
 478             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 479             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 480             session_regenerate_id(true);
 481         }
 482
 483         // Optional redirect after login:
 484         if (isset($_GET['post'])) {
 485             $uri = '?post='. urlencode($_GET['post']);
 486             foreach (array('description', 'source', 'title') as $param) {
 487                 if (!empty($_GET[$param])) {
 488                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 489                 }
 490             }
 491             header('Location: '. $uri);
 492             exit;
 493         }
 494
 495         if (isset($_GET['edit_link'])) {
 496             header('Location: ?edit_link='. escape($_GET['edit_link']));
 497             exit;
 498         }
 499
 500         if (isset($_POST['returnurl'])) {
 501             // Prevent loops over login screen.
 502             if (strpos($_POST['returnurl'], 'do=login') === false) {
 503                 header('Location: '. escape($_POST['returnurl']));
 504                 exit;
 505             }
 506         }
 507         header('Location: ?'); exit;
 508     }
 509     else
 510     {
 511         ban_loginFailed();
 512         $redir = '';
 513         if (isset($_GET['post'])) {
 514             $redir = '?post=' . urlencode($_GET['post']);
 515             foreach (array('description', 'source', 'title') as $param) {
 516                 if (!empty($_GET[$param])) {
 517                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 518                 }
 519             }
 520         }
 521         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 522         exit;
 523     }
 524 }
 525
 526 // ------------------------------------------------------------------------------------------
 527 // Misc utility functions:
 528
 529 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 530 function return_bytes($val)
 531 {
 532     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 533     switch($last)
 534     {
 535         case 'g': $val *= 1024;
 536         case 'm': $val *= 1024;
 537         case 'k': $val *= 1024;
 538     }
 539     return $val;
 540 }
 541
 542 // Try to determine max file size for uploads (POST).
 543 // Returns an integer (in bytes)
 544 function getMaxFileSize()
 545 {
 546     $size1 = return_bytes(ini_get('post_max_size'));
 547     $size2 = return_bytes(ini_get('upload_max_filesize'));
 548     // Return the smaller of two:
 549     $maxsize = min($size1,$size2);
 550     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 551     return $maxsize;
 552 }
 553
 554 // ------------------------------------------------------------------------------------------
 555 // Token management for XSRF protection
 556 // Token should be used in any form which acts on data (create,update,delete,import...).
 557 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 558
 559 // Returns a token.
 560 function getToken()
 561 {
 562     $rnd = sha1(uniqid('',true).'_'.mt_rand().$GLOBALS['salt']);  // We generate a random string.
 563     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 564     return $rnd;
 565 }
 566
 567 // Tells if a token is OK. Using this function will destroy the token.
 568 // true=token is OK.
 569 function tokenOk($token)
 570 {
 571     if (isset($_SESSION['tokens'][$token]))
 572     {
 573         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 574         return true; // Token is OK.
 575     }
 576     return false; // Wrong token, or already used.
 577 }
 578
 579 // ------------------------------------------------------------------------------------------
 580 /* This class is in charge of building the final page.
 581    (This is basically a wrapper around RainTPL which pre-fills some fields.)
 582    p = new pageBuilder;
 583    p.assign('myfield','myvalue');
 584    p.renderPage('mytemplate');
 585
 586 */
 587 class pageBuilder
 588 {
 589     private $tpl; // RainTPL template
 590
 591     function __construct()
 592     {
 593         $this->tpl = false;
 594     }
 595
 596     /**
 597      * Initialize all default tpl tags.
 598      */
 599     private function initialize()
 600     {
 601         $this->tpl = new RainTPL;
 602
 603         try {
 604             $version = ApplicationUtils::checkUpdate(
 605                 shaarli_version,
 606                 $GLOBALS['config']['UPDATECHECK_FILENAME'],
 607                 $GLOBALS['config']['UPDATECHECK_INTERVAL'],
 608                 $GLOBALS['config']['ENABLE_UPDATECHECK'],
 609                 isLoggedIn(),
 610                 $GLOBALS['config']['UPDATECHECK_BRANCH']
 611             );
 612             $this->tpl->assign('newVersion', escape($version));
 613             $this->tpl->assign('versionError', '');
 614
 615         } catch (Exception $exc) {
 616             logm($GLOBALS['config']['LOG_FILE'], $_SERVER['REMOTE_ADDR'], $exc->getMessage());
 617             $this->tpl->assign('newVersion', '');
 618             $this->tpl->assign('versionError', escape($exc->getMessage()));
 619         }
 620
 621         $this->tpl->assign('feedurl', escape(index_url($_SERVER)));
 622         $searchcrits = ''; // Search criteria
 623         if (!empty($_GET['searchtags'])) {
 624             $searchcrits .= '&searchtags=' . urlencode($_GET['searchtags']);
 625         }
 626         if (!empty($_GET['searchterm'])) {
 627             $searchcrits .= '&searchterm=' . urlencode($_GET['searchterm']);
 628         }
 629         $this->tpl->assign('searchcrits', $searchcrits);
 630         $this->tpl->assign('source', index_url($_SERVER));
 631         $this->tpl->assign('version', shaarli_version);
 632         $this->tpl->assign('scripturl', index_url($_SERVER));
 633         $this->tpl->assign('pagetitle', 'Shaarli');
 634         $this->tpl->assign('privateonly', !empty($_SESSION['privateonly'])); // Show only private links?
 635         if (!empty($GLOBALS['title'])) {
 636             $this->tpl->assign('pagetitle', $GLOBALS['title']);
 637         }
 638         if (!empty($GLOBALS['titleLink'])) {
 639             $this->tpl->assign('titleLink', $GLOBALS['titleLink']);
 640         }
 641         if (!empty($GLOBALS['pagetitle'])) {
 642             $this->tpl->assign('pagetitle', $GLOBALS['pagetitle']);
 643         }
 644         $this->tpl->assign('shaarlititle', empty($GLOBALS['title']) ? 'Shaarli': $GLOBALS['title']);
 645         if (!empty($GLOBALS['plugin_errors'])) {
 646             $this->tpl->assign('plugin_errors', $GLOBALS['plugin_errors']);
 647         }
 648     }
 649
 650     // The following assign() method is basically the same as RainTPL (except that it's lazy)
 651     public function assign($what,$where)
 652     {
 653         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 654         $this->tpl->assign($what,$where);
 655     }
 656
 657     // Render a specific page (using a template).
 658     // e.g. pb.renderPage('picwall')
 659     public function renderPage($page)
 660     {
 661         if ($this->tpl===false) $this->initialize(); // Lazy initialization
 662         $this->tpl->draw($page);
 663     }
 664
 665     /**
 666     * Render a 404 page (uses the template : tpl/404.tpl)
 667     *
 668     * usage : $PAGE->render404('The link was deleted')
 669     * @param string $message A messate to display what is not found
 670     */
 671     public function render404($message='The page you are trying to reach does not exist or has been deleted.') {
 672         header($_SERVER['SERVER_PROTOCOL'] . ' 404 Not Found');
 673         $this->tpl->assign('error_message', $message);
 674         $this->renderPage('404');
 675     }
 676 }
 677
 678 // ------------------------------------------------------------------------------------------
 679 // Output the last N links in RSS 2.0 format.
 680 function showRSS()
 681 {
 682     header('Content-Type: application/rss+xml; charset=utf-8');
 683
 684     // $usepermalink : If true, use permalink instead of final link.
 685     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=rss&permalinks
 686     // Also enabled through a config option
 687     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 688
 689     // Cache system
 690     $query = $_SERVER["QUERY_STRING"];
 691     $cache = new CachedPage(
 692         $GLOBALS['config']['PAGECACHE'],
 693         page_url($_SERVER),
 694         startsWith($query,'do=rss') && !isLoggedIn()
 695     );
 696     $cached = $cache->cachedVersion();
 697     if (! empty($cached)) {
 698         echo $cached;
 699         exit;
 700     }
 701
 702     // If cached was not found (or not usable), then read the database and build the response:
 703     $LINKSDB = new LinkDB(
 704         $GLOBALS['config']['DATASTORE'],
 705         isLoggedIn(),
 706         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 707         $GLOBALS['redirector']
 708     );
 709     // Read links from database (and filter private links if user it not logged in).
 710
 711     // Optionally filter the results:
 712     $searchtags = !empty($_GET['searchtags']) ? escape($_GET['searchtags']) : '';
 713     $searchterm = !empty($_GET['searchterm']) ? escape($_GET['searchterm']) : '';
 714     if (! empty($searchtags) && ! empty($searchterm)) {
 715         $linksToDisplay = $LINKSDB->filter(
 716             LinkFilter::$FILTER_TAG | LinkFilter::$FILTER_TEXT,
 717             array($searchtags, $searchterm)
 718         );
 719     }
 720     elseif ($searchtags) {
 721         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $searchtags);
 722     }
 723     elseif ($searchterm) {
 724         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $searchterm);
 725     }
 726     else {
 727         $linksToDisplay = $LINKSDB;
 728     }
 729
 730     $nblinksToDisplay = 50;  // Number of links to display.
 731     // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 732     if (!empty($_GET['nb'])) {
 733         $nblinksToDisplay = $_GET['nb'] == 'all' ? count($linksToDisplay) : max(intval($_GET['nb']), 1);
 734     }
 735
 736     $pageaddr = escape(index_url($_SERVER));
 737     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/">';
 738     echo '<channel><title>'.$GLOBALS['title'].'</title><link>'.$pageaddr.'</link>';
 739     echo '<description>Shared links</description><language>en-en</language><copyright>'.$pageaddr.'</copyright>'."\n\n";
 740     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 741     {
 742         echo '<!-- PubSubHubbub Discovery -->';
 743         echo '<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" xmlns="http://www.w3.org/2005/Atom" />';
 744         echo '<link rel="self" href="'.$pageaddr.'?do=rss" xmlns="http://www.w3.org/2005/Atom" />';
 745         echo '<!-- End Of PubSubHubbub Discovery -->';
 746     }
 747     $i=0;
 748     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 749     while ($i<$nblinksToDisplay && $i<count($keys))
 750     {
 751         $link = $linksToDisplay[$keys[$i]];
 752         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 753         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
 754         $absurl = $link['url'];
 755         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 756         if ($usepermalinks===true)
 757             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="true">'.$guid.'</guid><link>'.$guid.'</link>';
 758         else
 759             echo '<item><title>'.$link['title'].'</title><guid isPermaLink="false">'.$guid.'</guid><link>'.$absurl.'</link>';
 760         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) {
 761             echo '<pubDate>'.escape($date->format(DateTime::RSS))."</pubDate>\n";
 762         }
 763         if ($link['tags']!='') // Adding tags to each RSS entry (as mentioned in RSS specification)
 764         {
 765             foreach(explode(' ',$link['tags']) as $tag) { echo '<category domain="'.$pageaddr.'">'.$tag.'</category>'."\n"; }
 766         }
 767
 768         // Add permalink in description
 769         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 770         // If user wants permalinks first, put the final link in description
 771         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 772         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 773         echo '<description><![CDATA['.
 774             format_description($link['description'], $GLOBALS['redirector']) .
 775             $descriptionlink . ']]></description>' . "\n</item>\n";
 776         $i++;
 777     }
 778     echo '</channel></rss><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 779
 780     $cache->cache(ob_get_contents());
 781     ob_end_flush();
 782     exit;
 783 }
 784
 785 // ------------------------------------------------------------------------------------------
 786 // Output the last N links in ATOM format.
 787 function showATOM()
 788 {
 789     header('Content-Type: application/atom+xml; charset=utf-8');
 790
 791     // $usepermalink : If true, use permalink instead of final link.
 792     // User just has to add 'permalink' in URL parameters. e.g. http://mysite.com/shaarli/?do=atom&permalinks
 793     $usepermalinks = isset($_GET['permalinks']) || !$GLOBALS['config']['ENABLE_RSS_PERMALINKS'];
 794
 795     // Cache system
 796     $query = $_SERVER["QUERY_STRING"];
 797     $cache = new CachedPage(
 798         $GLOBALS['config']['PAGECACHE'],
 799         page_url($_SERVER),
 800         startsWith($query,'do=atom') && !isLoggedIn()
 801     );
 802     $cached = $cache->cachedVersion();
 803     if (!empty($cached)) {
 804         echo $cached;
 805         exit;
 806     }
 807
 808     // If cached was not found (or not usable), then read the database and build the response:
 809     // Read links from database (and filter private links if used it not logged in).
 810     $LINKSDB = new LinkDB(
 811         $GLOBALS['config']['DATASTORE'],
 812         isLoggedIn(),
 813         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 814         $GLOBALS['redirector']
 815     );
 816
 817     // Optionally filter the results:
 818     $searchtags = !empty($_GET['searchtags']) ? escape($_GET['searchtags']) : '';
 819     $searchterm = !empty($_GET['searchterm']) ? escape($_GET['searchterm']) : '';
 820     if (! empty($searchtags) && ! empty($searchterm)) {
 821         $linksToDisplay = $LINKSDB->filter(
 822             LinkFilter::$FILTER_TAG | LinkFilter::$FILTER_TEXT,
 823             array($searchtags, $searchterm)
 824         );
 825     }
 826     elseif ($searchtags) {
 827         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $searchtags);
 828     }
 829     elseif ($searchterm) {
 830         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $searchterm);
 831     }
 832     else {
 833         $linksToDisplay = $LINKSDB;
 834     }
 835
 836     $nblinksToDisplay = 50;  // Number of links to display.
 837     // In URL, you can specificy the number of links. Example: nb=200 or nb=all for all links.
 838     if (!empty($_GET['nb'])) {
 839         $nblinksToDisplay = $_GET['nb']=='all' ? count($linksToDisplay) : max(intval($_GET['nb']), 1);
 840     }
 841
 842     $pageaddr=escape(index_url($_SERVER));
 843     $latestDate = '';
 844     $entries='';
 845     $i=0;
 846     $keys=array(); foreach($linksToDisplay as $key=>$value) { $keys[]=$key; }  // No, I can't use array_keys().
 847     while ($i<$nblinksToDisplay && $i<count($keys))
 848     {
 849         $link = $linksToDisplay[$keys[$i]];
 850         $guid = $pageaddr.'?'.smallHash($link['linkdate']);
 851         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
 852         $iso8601date = $date->format(DateTime::ISO8601);
 853         $latestDate = max($latestDate, $iso8601date);
 854         $absurl = $link['url'];
 855         if (startsWith($absurl,'?')) $absurl=$pageaddr.$absurl;  // make permalink URL absolute
 856         $entries.='<entry><title>'.$link['title'].'</title>';
 857         if ($usepermalinks===true)
 858             $entries.='<link href="'.$guid.'" /><id>'.$guid.'</id>';
 859         else
 860             $entries.='<link href="'.$absurl.'" /><id>'.$guid.'</id>';
 861
 862         if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) {
 863             $entries.='<updated>'.escape($iso8601date).'</updated>';
 864         }
 865
 866         // Add permalink in description
 867         $descriptionlink = '(<a href="'.$guid.'">Permalink</a>)';
 868         // If user wants permalinks first, put the final link in description
 869         if ($usepermalinks===true) $descriptionlink = '(<a href="'.$absurl.'">Link</a>)';
 870         if (strlen($link['description'])>0) $descriptionlink = '<br>'.$descriptionlink;
 871
 872         $entries .= '<content type="html"><![CDATA['.
 873             format_description($link['description'], $GLOBALS['redirector']) .
 874             $descriptionlink . "]]></content>\n";
 875         if ($link['tags']!='') // Adding tags to each ATOM entry (as mentioned in ATOM specification)
 876         {
 877             foreach(explode(' ',$link['tags']) as $tag)
 878                 { $entries.='<category scheme="'.$pageaddr.'" term="'.$tag.'" />'."\n"; }
 879         }
 880         $entries.="</entry>\n";
 881         $i++;
 882     }
 883     $feed='<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">';
 884     $feed.='<title>'.$GLOBALS['title'].'</title>';
 885     if (!$GLOBALS['config']['HIDE_TIMESTAMPS'] || isLoggedIn()) $feed.='<updated>'.escape($latestDate).'</updated>';
 886     $feed.='<link rel="self" href="'.escape(server_url($_SERVER).$_SERVER["REQUEST_URI"]).'" />';
 887     if (!empty($GLOBALS['config']['PUBSUBHUB_URL']))
 888     {
 889         $feed.='<!-- PubSubHubbub Discovery -->';
 890         $feed.='<link rel="hub" href="'.escape($GLOBALS['config']['PUBSUBHUB_URL']).'" />';
 891         $feed.='<!-- End Of PubSubHubbub Discovery -->';
 892     }
 893     $feed.='<author><name>'.$pageaddr.'</name><uri>'.$pageaddr.'</uri></author>';
 894     $feed.='<id>'.$pageaddr.'</id>'."\n\n"; // Yes, I know I should use a real IRI (RFC3987), but the site URL will do.
 895     $feed.=$entries;
 896     $feed.='</feed><!-- Cached version of '.escape(page_url($_SERVER)).' -->';
 897     echo $feed;
 898
 899     $cache->cache(ob_get_contents());
 900     ob_end_flush();
 901     exit;
 902 }
 903
 904 // ------------------------------------------------------------------------------------------
 905 // Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 906 // Gives the last 7 days (which have links).
 907 // This RSS feed cannot be filtered.
 908 function showDailyRSS() {
 909     // Cache system
 910     $query = $_SERVER["QUERY_STRING"];
 911     $cache = new CachedPage(
 912         $GLOBALS['config']['PAGECACHE'],
 913         page_url($_SERVER),
 914         startsWith($query,'do=dailyrss') && !isLoggedIn()
 915     );
 916     $cached = $cache->cachedVersion();
 917     if (!empty($cached)) {
 918         echo $cached;
 919         exit;
 920     }
 921
 922     // If cached was not found (or not usable), then read the database and build the response:
 923     // Read links from database (and filter private links if used it not logged in).
 924     $LINKSDB = new LinkDB(
 925         $GLOBALS['config']['DATASTORE'],
 926         isLoggedIn(),
 927         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
 928         $GLOBALS['redirector']
 929     );
 930
 931     /* Some Shaarlies may have very few links, so we need to look
 932        back in time (rsort()) until we have enough days ($nb_of_days).
 933     */
 934     $linkdates = array();
 935     foreach ($LINKSDB as $linkdate => $value) {
 936         $linkdates[] = $linkdate;
 937     }
 938     rsort($linkdates);
 939     $nb_of_days = 7; // We take 7 days.
 940     $today = Date('Ymd');
 941     $days = array();
 942
 943     foreach ($linkdates as $linkdate) {
 944         $day = substr($linkdate, 0, 8); // Extract day (without time)
 945         if (strcmp($day,$today) < 0) {
 946             if (empty($days[$day])) {
 947                 $days[$day] = array();
 948             }
 949             $days[$day][] = $linkdate;
 950         }
 951
 952         if (count($days) > $nb_of_days) {
 953             break; // Have we collected enough days?
 954         }
 955     }
 956
 957     // Build the RSS feed.
 958     header('Content-Type: application/rss+xml; charset=utf-8');
 959     $pageaddr = escape(index_url($_SERVER));
 960     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 961     echo '<channel>';
 962     echo '<title>Daily - '. $GLOBALS['title'] . '</title>';
 963     echo '<link>'. $pageaddr .'</link>';
 964     echo '<description>Daily shared links</description>';
 965     echo '<language>en-en</language>';
 966     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 967
 968     // For each day.
 969     foreach ($days as $day => $linkdates) {
 970         $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 971         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 972
 973         // Build the HTML body of this RSS entry.
 974         $html = '';
 975         $href = '';
 976         $links = array();
 977
 978         // We pre-format some fields for proper output.
 979         foreach ($linkdates as $linkdate) {
 980             $l = $LINKSDB[$linkdate];
 981             $l['formatedDescription'] = format_description($l['description'], $GLOBALS['redirector']);
 982             $l['thumbnail'] = thumbnail($l['url']);
 983             $l_date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $l['linkdate']);
 984             $l['timestamp'] = $l_date->getTimestamp();
 985             if (startsWith($l['url'], '?')) {
 986                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 987             }
 988             $links[$linkdate] = $l;
 989         }
 990
 991         // Then build the HTML for this day:
 992         $tpl = new RainTPL;
 993         $tpl->assign('title', $GLOBALS['title']);
 994         $tpl->assign('daydate', $dayDate->getTimestamp());
 995         $tpl->assign('absurl', $absurl);
 996         $tpl->assign('links', $links);
 997         $tpl->assign('rssdate', escape($dayDate->format(DateTime::RSS)));
 998         $html = $tpl->draw('dailyrss', $return_string=true);
 999
1000         echo $html . PHP_EOL;
1001     }
1002     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
1003
1004     $cache->cache(ob_get_contents());
1005     ob_end_flush();
1006     exit;
1007 }
1008
1009 /**
1010  * Show the 'Daily' page.
1011  *
1012  * @param PageBuilder $pageBuilder Template engine wrapper.
1013  */
1014 function showDaily($pageBuilder)
1015 {
1016     $LINKSDB = new LinkDB(
1017         $GLOBALS['config']['DATASTORE'],
1018         isLoggedIn(),
1019         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1020         $GLOBALS['redirector']
1021     );
1022
1023     $day=Date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
1024     if (isset($_GET['day'])) $day=$_GET['day'];
1025
1026     $days = $LINKSDB->days();
1027     $i = array_search($day,$days);
1028     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
1029     $previousday='';
1030     $nextday='';
1031     if ($i!==false)
1032     {
1033         if ($i>=1) $previousday=$days[$i-1];
1034         if ($i<count($days)-1) $nextday=$days[$i+1];
1035     }
1036
1037     try {
1038         $linksToDisplay = $LINKSDB->filter(LinkFilter::$FILTER_DAY, $day);
1039     } catch (Exception $exc) {
1040         error_log($exc);
1041         $linksToDisplay = array();
1042     }
1043
1044     // We pre-format some fields for proper output.
1045     foreach($linksToDisplay as $key=>$link)
1046     {
1047
1048         $taglist = explode(' ',$link['tags']);
1049         uasort($taglist, 'strcasecmp');
1050         $linksToDisplay[$key]['taglist']=$taglist;
1051         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $GLOBALS['redirector']);
1052         $linksToDisplay[$key]['thumbnail'] = thumbnail($link['url']);
1053         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
1054         $linksToDisplay[$key]['timestamp'] = $date->getTimestamp();
1055     }
1056
1057     /* We need to spread the articles on 3 columns.
1058        I did not want to use a JavaScript lib like http://masonry.desandro.com/
1059        so I manually spread entries with a simple method: I roughly evaluate the
1060        height of a div according to title and description length.
1061     */
1062     $columns=array(array(),array(),array()); // Entries to display, for each column.
1063     $fill=array(0,0,0);  // Rough estimate of columns fill.
1064     foreach($linksToDisplay as $key=>$link)
1065     {
1066         // Roughly estimate length of entry (by counting characters)
1067         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
1068         // Description: 836 characters gives roughly 342 pixel height.
1069         // This is not perfect, but it's usually OK.
1070         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
1071         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
1072         // Then put in column which is the less filled:
1073         $smallest=min($fill); // find smallest value in array.
1074         $index=array_search($smallest,$fill); // find index of this smallest value.
1075         array_push($columns[$index],$link); // Put entry in this column.
1076         $fill[$index]+=$length;
1077     }
1078
1079     $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
1080     $data = array(
1081         'linksToDisplay' => $linksToDisplay,
1082         'linkcount' => count($LINKSDB),
1083         'cols' => $columns,
1084         'day' => $dayDate->getTimestamp(),
1085         'previousday' => $previousday,
1086         'nextday' => $nextday,
1087     );
1088     $pluginManager = PluginManager::getInstance();
1089     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
1090
1091     foreach ($data as $key => $value) {
1092         $pageBuilder->assign($key, $value);
1093     }
1094
1095     $pageBuilder->renderPage('daily');
1096     exit;
1097 }
1098
1099 // Renders the linklist
1100 function showLinkList($PAGE, $LINKSDB) {
1101     buildLinkList($PAGE,$LINKSDB); // Compute list of links to display
1102     $PAGE->renderPage('linklist');
1103 }
1104
1105
1106 // ------------------------------------------------------------------------------------------
1107 // Render HTML page (according to URL parameters and user rights)
1108 function renderPage()
1109 {
1110     $LINKSDB = new LinkDB(
1111         $GLOBALS['config']['DATASTORE'],
1112         isLoggedIn(),
1113         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1114         $GLOBALS['redirector']
1115     );
1116
1117     $updater = new Updater(
1118         read_updates_file($GLOBALS['config']['UPDATES_FILE']),
1119         $GLOBALS,
1120         $LINKSDB,
1121         isLoggedIn()
1122     );
1123     try {
1124         $newUpdates = $updater->update();
1125         if (! empty($newUpdates)) {
1126             write_updates_file(
1127                 $GLOBALS['config']['UPDATES_FILE'],
1128                 $updater->getDoneUpdates()
1129             );
1130         }
1131     }
1132     catch(Exception $e) {
1133         die($e->getMessage());
1134     }
1135
1136     $PAGE = new pageBuilder;
1137
1138     // Determine which page will be rendered.
1139     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
1140     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
1141
1142     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
1143     // Then assign generated data to RainTPL.
1144     $common_hooks = array(
1145         'includes',
1146         'header',
1147         'footer',
1148     );
1149     $pluginManager = PluginManager::getInstance();
1150     foreach($common_hooks as $name) {
1151         $plugin_data = array();
1152         $pluginManager->executeHooks('render_' . $name, $plugin_data,
1153             array(
1154                 'target' => $targetPage,
1155                 'loggedin' => isLoggedIn()
1156             )
1157         );
1158         $PAGE->assign('plugins_' . $name, $plugin_data);
1159     }
1160
1161     // -------- Display login form.
1162     if ($targetPage == Router::$PAGE_LOGIN)
1163     {
1164         if ($GLOBALS['config']['OPEN_SHAARLI']) { header('Location: ?'); exit; }  // No need to login for open Shaarli
1165         $token=''; if (ban_canLogin()) $token=getToken(); // Do not waste token generation if not useful.
1166         $PAGE->assign('token',$token);
1167         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
1168         $PAGE->renderPage('loginform');
1169         exit;
1170     }
1171     // -------- User wants to logout.
1172     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=logout'))
1173     {
1174         invalidateCaches($GLOBALS['config']['PAGECACHE']);
1175         logout();
1176         header('Location: ?');
1177         exit;
1178     }
1179
1180     // -------- Picture wall
1181     if ($targetPage == Router::$PAGE_PICWALL)
1182     {
1183         // Optionally filter the results:
1184         $searchtags = !empty($_GET['searchtags']) ? escape($_GET['searchtags']) : '';
1185         $searchterm = !empty($_GET['searchterm']) ? escape($_GET['searchterm']) : '';
1186         if (! empty($searchtags) && ! empty($searchterm)) {
1187             $links = $LINKSDB->filter(
1188                 LinkFilter::$FILTER_TAG | LinkFilter::$FILTER_TEXT,
1189                 array($searchtags, $searchterm)
1190             );
1191         }
1192         elseif ($searchtags) {
1193             $links = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $searchtags);
1194         }
1195         elseif ($searchterm) {
1196             $links = $LINKSDB->filter(LinkFilter::$FILTER_TEXT, $searchterm);
1197         }
1198         else {
1199             $links = $LINKSDB;
1200         }
1201
1202         $linksToDisplay = array();
1203
1204         // Get only links which have a thumbnail.
1205         foreach($links as $link)
1206         {
1207             $permalink='?'.escape(smallhash($link['linkdate']));
1208             $thumb=lazyThumbnail($link['url'],$permalink);
1209             if ($thumb!='') // Only output links which have a thumbnail.
1210             {
1211                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
1212                 $linksToDisplay[]=$link; // Add to array.
1213             }
1214         }
1215
1216         $data = array(
1217             'linkcount' => count($LINKSDB),
1218             'linksToDisplay' => $linksToDisplay,
1219         );
1220         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
1221
1222         foreach ($data as $key => $value) {
1223             $PAGE->assign($key, $value);
1224         }
1225
1226         $PAGE->renderPage('picwall');
1227         exit;
1228     }
1229
1230     // -------- Tag cloud
1231     if ($targetPage == Router::$PAGE_TAGCLOUD)
1232     {
1233         $tags= $LINKSDB->allTags();
1234
1235         // We sort tags alphabetically, then choose a font size according to count.
1236         // First, find max value.
1237         $maxcount = 0;
1238         foreach ($tags as $value) {
1239             $maxcount = max($maxcount, $value);
1240         }
1241
1242         // Sort tags alphabetically: case insensitive, support locale if avalaible.
1243         uksort($tags, function($a, $b) {
1244             // Collator is part of PHP intl.
1245             if (class_exists('Collator')) {
1246                 $c = new Collator(setlocale(LC_ALL, 0));
1247                 return $c->compare($a, $b);
1248             } else {
1249                 return strcasecmp($a, $b);
1250             }
1251         });
1252
1253         $tagList=array();
1254         foreach($tags as $key=>$value)
1255         // Tag font size scaling: default 15 and 30 logarithm bases affect scaling, 22 and 6 are arbitrary font sizes for max and min sizes.
1256         {
1257             $tagList[$key] = array('count'=>$value,'size'=>log($value, 15) / log($maxcount, 30) * (22-6) + 6);
1258         }
1259
1260         $data = array(
1261             'linkcount' => count($LINKSDB),
1262             'tags' => $tagList,
1263         );
1264         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
1265
1266         foreach ($data as $key => $value) {
1267             $PAGE->assign($key, $value);
1268         }
1269
1270         $PAGE->renderPage('tagcloud');
1271         exit;
1272     }
1273
1274     // Daily page.
1275     if ($targetPage == Router::$PAGE_DAILY) {
1276         showDaily($PAGE);
1277     }
1278
1279     // Display openseach plugin (XML)
1280     if ($targetPage == Router::$PAGE_OPENSEARCH) {
1281         header('Content-Type: application/xml; charset=utf-8');
1282         $PAGE->assign('serverurl', index_url($_SERVER));
1283         $PAGE->renderPage('opensearch');
1284         exit;
1285     }
1286
1287     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
1288     if (isset($_GET['addtag']))
1289     {
1290         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
1291         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
1292         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
1293
1294         // Prevent redirection loop
1295         if (isset($params['addtag'])) {
1296             unset($params['addtag']);
1297         }
1298
1299         // Check if this tag is already in the search query and ignore it if it is.
1300         // Each tag is always separated by a space
1301         if (isset($params['searchtags'])) {
1302             $current_tags = explode(' ', $params['searchtags']);
1303         } else {
1304             $current_tags = array();
1305         }
1306         $addtag = true;
1307         foreach ($current_tags as $value) {
1308             if ($value === $_GET['addtag']) {
1309                 $addtag = false;
1310                 break;
1311             }
1312         }
1313         // Append the tag if necessary
1314         if (empty($params['searchtags'])) {
1315             $params['searchtags'] = trim($_GET['addtag']);
1316         }
1317         else if ($addtag) {
1318             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
1319         }
1320
1321         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1322         header('Location: ?'.http_build_query($params));
1323         exit;
1324     }
1325
1326     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
1327     if (isset($_GET['removetag'])) {
1328         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
1329         if (empty($_SERVER['HTTP_REFERER'])) {
1330             header('Location: ?');
1331             exit;
1332         }
1333
1334         // In case browser does not send HTTP_REFERER
1335         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1336
1337         // Prevent redirection loop
1338         if (isset($params['removetag'])) {
1339             unset($params['removetag']);
1340         }
1341
1342         if (isset($params['searchtags'])) {
1343             $tags = explode(' ', $params['searchtags']);
1344             // Remove value from array $tags.
1345             $tags = array_diff($tags, array($_GET['removetag']));
1346             $params['searchtags'] = implode(' ',$tags);
1347
1348             if (empty($params['searchtags'])) {
1349                 unset($params['searchtags']);
1350             }
1351
1352             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1353         }
1354         header('Location: ?'.http_build_query($params));
1355         exit;
1356     }
1357
1358     // -------- User wants to change the number of links per page (linksperpage=...)
1359     if (isset($_GET['linksperpage'])) {
1360         if (is_numeric($_GET['linksperpage'])) {
1361             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1362         }
1363
1364         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1365         exit;
1366     }
1367
1368     // -------- User wants to see only private links (toggle)
1369     if (isset($_GET['privateonly'])) {
1370         if (empty($_SESSION['privateonly'])) {
1371             $_SESSION['privateonly'] = 1; // See only private links
1372         } else {
1373             unset($_SESSION['privateonly']); // See all links
1374         }
1375
1376         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1377         exit;
1378     }
1379
1380     // -------- Handle other actions allowed for non-logged in users:
1381     if (!isLoggedIn())
1382     {
1383         // User tries to post new link but is not logged in:
1384         // Show login screen, then redirect to ?post=...
1385         if (isset($_GET['post']))
1386         {
1387             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1388             exit;
1389         }
1390
1391                 // Same case as above except that user tried to access ?do=addlink without being logged in
1392                 // Note: passing empty parameters makes Shaarli generate default URLs and descriptions.
1393                 if (isset($_GET['do']) && $_GET['do'] === 'addlink') {
1394                         header('Location: ?do=login&post=');
1395                         exit;
1396                 }
1397         showLinkList($PAGE, $LINKSDB);
1398         if (isset($_GET['edit_link'])) {
1399             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1400             exit;
1401         }
1402
1403         exit; // Never remove this one! All operations below are reserved for logged in user.
1404     }
1405
1406     // -------- All other functions are reserved for the registered user:
1407
1408     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1409     if ($targetPage == Router::$PAGE_TOOLS)
1410     {
1411         $data = array(
1412             'linkcount' => count($LINKSDB),
1413             'pageabsaddr' => index_url($_SERVER),
1414         );
1415         $pluginManager->executeHooks('render_tools', $data);
1416
1417         foreach ($data as $key => $value) {
1418             $PAGE->assign($key, $value);
1419         }
1420
1421         $PAGE->renderPage('tools');
1422         exit;
1423     }
1424
1425     // -------- User wants to change his/her password.
1426     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1427     {
1428         if ($GLOBALS['config']['OPEN_SHAARLI']) die('You are not supposed to change a password on an Open Shaarli.');
1429         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1430         {
1431             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1432
1433             // Make sure old password is correct.
1434             $oldhash = sha1($_POST['oldpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1435             if ($oldhash!=$GLOBALS['hash']) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1436             // Save new password
1437             $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
1438             $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
1439             try {
1440                 writeConfig($GLOBALS, isLoggedIn());
1441             }
1442             catch(Exception $e) {
1443                 error_log(
1444                     'ERROR while writing config file after changing password.' . PHP_EOL .
1445                     $e->getMessage()
1446                 );
1447
1448                 // TODO: do not handle exceptions/errors in JS.
1449                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1450                 exit;
1451             }
1452             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1453             exit;
1454         }
1455         else // show the change password form.
1456         {
1457             $PAGE->assign('linkcount',count($LINKSDB));
1458             $PAGE->assign('token',getToken());
1459             $PAGE->renderPage('changepassword');
1460             exit;
1461         }
1462     }
1463
1464     // -------- User wants to change configuration
1465     if ($targetPage == Router::$PAGE_CONFIGURE)
1466     {
1467         if (!empty($_POST['title']) )
1468         {
1469             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1470             $tz = 'UTC';
1471             if (!empty($_POST['continent']) && !empty($_POST['city']))
1472                 if (isTimeZoneValid($_POST['continent'],$_POST['city']))
1473                     $tz = $_POST['continent'].'/'.$_POST['city'];
1474             $GLOBALS['timezone'] = $tz;
1475             $GLOBALS['title']=$_POST['title'];
1476             $GLOBALS['titleLink']=$_POST['titleLink'];
1477             $GLOBALS['redirector']=$_POST['redirector'];
1478             $GLOBALS['disablesessionprotection']=!empty($_POST['disablesessionprotection']);
1479             $GLOBALS['privateLinkByDefault']=!empty($_POST['privateLinkByDefault']);
1480             $GLOBALS['config']['ENABLE_RSS_PERMALINKS']= !empty($_POST['enableRssPermalinks']);
1481             $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
1482             $GLOBALS['config']['HIDE_PUBLIC_LINKS'] = !empty($_POST['hidePublicLinks']);
1483             try {
1484                 writeConfig($GLOBALS, isLoggedIn());
1485             }
1486             catch(Exception $e) {
1487                 error_log(
1488                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1489                     $e->getMessage()
1490                 );
1491
1492                 // TODO: do not handle exceptions/errors in JS.
1493                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1494                 exit;
1495             }
1496             echo '<script>alert("Configuration was saved.");document.location=\'?do=tools\';</script>';
1497             exit;
1498         }
1499         else // Show the configuration form.
1500         {
1501             $PAGE->assign('linkcount',count($LINKSDB));
1502             $PAGE->assign('token',getToken());
1503             $PAGE->assign('title', empty($GLOBALS['title']) ? '' : $GLOBALS['title'] );
1504             $PAGE->assign('redirector', empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'] );
1505             list($timezone_form, $timezone_js) = generateTimeZoneForm($GLOBALS['timezone']);
1506             $PAGE->assign('timezone_form', $timezone_form);
1507             $PAGE->assign('timezone_js',$timezone_js);
1508             $PAGE->renderPage('configure');
1509             exit;
1510         }
1511     }
1512
1513     // -------- User wants to rename a tag or delete it
1514     if ($targetPage == Router::$PAGE_CHANGETAG)
1515     {
1516         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1517             $PAGE->assign('linkcount', count($LINKSDB));
1518             $PAGE->assign('token', getToken());
1519             $PAGE->assign('tags', $LINKSDB->allTags());
1520             $PAGE->renderPage('changetag');
1521             exit;
1522         }
1523
1524         if (!tokenOk($_POST['token'])) {
1525             die('Wrong token.');
1526         }
1527
1528         // Delete a tag:
1529         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1530             $needle=trim($_POST['fromtag']);
1531             // True for case-sensitive tag search.
1532             $linksToAlter = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $needle, true);
1533             foreach($linksToAlter as $key=>$value)
1534             {
1535                 $tags = explode(' ',trim($value['tags']));
1536                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1537                 $value['tags']=trim(implode(' ',$tags));
1538                 $LINKSDB[$key]=$value;
1539             }
1540             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1541             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1542             exit;
1543         }
1544
1545         // Rename a tag:
1546         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1547             $needle=trim($_POST['fromtag']);
1548             // True for case-sensitive tag search.
1549             $linksToAlter = $LINKSDB->filter(LinkFilter::$FILTER_TAG, $needle, true);
1550             foreach($linksToAlter as $key=>$value)
1551             {
1552                 $tags = explode(' ',trim($value['tags']));
1553                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1554                 $value['tags']=trim(implode(' ',$tags));
1555                 $LINKSDB[$key]=$value;
1556             }
1557             $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // Save to disk.
1558             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1559             exit;
1560         }
1561     }
1562
1563     // -------- User wants to add a link without using the bookmarklet: Show form.
1564     if ($targetPage == Router::$PAGE_ADDLINK)
1565     {
1566         $PAGE->assign('linkcount',count($LINKSDB));
1567         $PAGE->renderPage('addlink');
1568         exit;
1569     }
1570
1571     // -------- User clicked the "Save" button when editing a link: Save link to database.
1572     if (isset($_POST['save_edit']))
1573     {
1574         // Go away!
1575         if (! tokenOk($_POST['token'])) {
1576             die('Wrong token.');
1577         }
1578         // Remove multiple spaces.
1579         $tags = trim(preg_replace('/\s\s+/', ' ', $_POST['lf_tags']));
1580         // Remove first '-' char in tags.
1581         $tags = preg_replace('/(^| )\-/', '$1', $tags);
1582         // Remove duplicates.
1583         $tags = implode(' ', array_unique(explode(' ', $tags)));
1584         $linkdate = $_POST['lf_linkdate'];
1585         $url = trim($_POST['lf_url']);
1586         if (! startsWith($url, 'http:') && ! startsWith($url, 'https:')
1587             && ! startsWith($url, 'ftp:') && ! startsWith($url, 'magnet:')
1588             && ! startsWith($url, '?') && ! startsWith($url, 'javascript:')
1589         ) {
1590             $url = 'http://' . $url;
1591         }
1592
1593         $link = array(
1594             'title' => trim($_POST['lf_title']),
1595             'url' => $url,
1596             'description' => $_POST['lf_description'],
1597             'private' => (isset($_POST['lf_private']) ? 1 : 0),
1598             'linkdate' => $linkdate,
1599             'tags' => str_replace(',', ' ', $tags)
1600         );
1601         // If title is empty, use the URL as title.
1602         if ($link['title'] == '') {
1603             $link['title'] = $link['url'];
1604         }
1605
1606         $pluginManager->executeHooks('save_link', $link);
1607
1608         $LINKSDB[$linkdate] = $link;
1609         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1610         pubsubhub();
1611
1612         // If we are called from the bookmarklet, we must close the popup:
1613         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1614             echo '<script>self.close();</script>';
1615             exit;
1616         }
1617
1618         $returnurl = !empty($_POST['returnurl']) ? $_POST['returnurl'] : '?';
1619         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1620         // Scroll to the link which has been edited.
1621         $location .= '#' . smallHash($_POST['lf_linkdate']);
1622         // After saving the link, redirect to the page the user was on.
1623         header('Location: '. $location);
1624         exit;
1625     }
1626
1627     // -------- User clicked the "Cancel" button when editing a link.
1628     if (isset($_POST['cancel_edit']))
1629     {
1630         // If we are called from the bookmarklet, we must close the popup:
1631         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1632         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1633         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1634         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1635         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1636         exit;
1637     }
1638
1639     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1640     if (isset($_POST['delete_link']))
1641     {
1642         if (!tokenOk($_POST['token'])) die('Wrong token.');
1643         // We do not need to ask for confirmation:
1644         // - confirmation is handled by JavaScript
1645         // - we are protected from XSRF by the token.
1646         $linkdate=$_POST['lf_linkdate'];
1647
1648         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1649
1650         unset($LINKSDB[$linkdate]);
1651         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']); // save to disk
1652
1653         // If we are called from the bookmarklet, we must close the popup:
1654         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1655         // Pick where we're going to redirect
1656         // =============================================================
1657         // Basically, we can't redirect to where we were previously if it was a permalink
1658         // or an edit_link, because it would 404.
1659         // Cases:
1660         //    - /             : nothing in $_GET, redirect to self
1661         //    - /?page        : redirect to self
1662         //    - /?searchterm  : redirect to self (there might be other links)
1663         //    - /?searchtags  : redirect to self
1664         //    - /permalink    : redirect to / (the link does not exist anymore)
1665         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1666         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1667         // redirect is not satisfied, and only then redirect to /
1668         $location = "?";
1669         // Self redirection
1670         if (count($_GET) == 0
1671             || isset($_GET['page'])
1672             || isset($_GET['searchterm'])
1673             || isset($_GET['searchtags'])
1674         ) {
1675             if (isset($_POST['returnurl'])) {
1676                 $location = $_POST['returnurl']; // Handle redirects given by the form
1677             } else {
1678                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1679             }
1680         }
1681
1682         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1683         exit;
1684     }
1685
1686     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1687     if (isset($_GET['edit_link']))
1688     {
1689         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1690         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1691         $data = array(
1692             'linkcount' => count($LINKSDB),
1693             'link' => $link,
1694             'link_is_new' => false,
1695             'token' => getToken(),
1696             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1697             'tags' => $LINKSDB->allTags(),
1698         );
1699         $pluginManager->executeHooks('render_editlink', $data);
1700
1701         foreach ($data as $key => $value) {
1702             $PAGE->assign($key, $value);
1703         }
1704
1705         $PAGE->renderPage('editlink');
1706         exit;
1707     }
1708
1709     // -------- User want to post a new link: Display link edit form.
1710     if (isset($_GET['post'])) {
1711         $url = cleanup_url(escape($_GET['post']));
1712
1713         $link_is_new = false;
1714         // Check if URL is not already in database (in this case, we will edit the existing link)
1715         $link = $LINKSDB->getLinkFromUrl($url);
1716         if (!$link)
1717         {
1718             $link_is_new = true;
1719             $linkdate = strval(date('Ymd_His'));
1720             // Get title if it was provided in URL (by the bookmarklet).
1721             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1722             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1723             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1724             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1725             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1726             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1727             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1728                 // Short timeout to keep the application responsive
1729                 list($headers, $content) = get_http_response($url, 4);
1730                 if (strpos($headers[0], '200 OK') !== false) {
1731                     // Retrieve charset.
1732                     $charset = get_charset($headers, $content);
1733                     // Extract title.
1734                     $title = html_extract_title($content);
1735                     // Re-encode title in utf-8 if necessary.
1736                     if (! empty($title) && $charset != 'utf-8') {
1737                         $title = mb_convert_encoding($title, $charset, 'utf-8');
1738                     }
1739                 }
1740             }
1741
1742             if ($url == '') {
1743                 $url = '?' . smallHash($linkdate);
1744                 $title = 'Note: ';
1745             }
1746
1747             $link = array(
1748                 'linkdate' => $linkdate,
1749                 'title' => $title,
1750                 'url' => $url,
1751                 'description' => $description,
1752                 'tags' => $tags,
1753                 'private' => $private
1754             );
1755         }
1756
1757         $data = array(
1758             'linkcount' => count($LINKSDB),
1759             'link' => $link,
1760             'link_is_new' => $link_is_new,
1761             'token' => getToken(), // XSRF protection.
1762             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1763             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1764             'tags' => $LINKSDB->allTags(),
1765         );
1766         $pluginManager->executeHooks('render_editlink', $data);
1767
1768         foreach ($data as $key => $value) {
1769             $PAGE->assign($key, $value);
1770         }
1771
1772         $PAGE->renderPage('editlink');
1773         exit;
1774     }
1775
1776     // -------- Export as Netscape Bookmarks HTML file.
1777     if ($targetPage == Router::$PAGE_EXPORT)
1778     {
1779         if (empty($_GET['what']))
1780         {
1781             $PAGE->assign('linkcount',count($LINKSDB));
1782             $PAGE->renderPage('export');
1783             exit;
1784         }
1785         $exportWhat=$_GET['what'];
1786         if (!array_intersect(array('all','public','private'),array($exportWhat))) die('What are you trying to export???');
1787
1788         header('Content-Type: text/html; charset=utf-8');
1789         header('Content-disposition: attachment; filename=bookmarks_'.$exportWhat.'_'.strval(date('Ymd_His')).'.html');
1790         $currentdate=date('Y/m/d H:i:s');
1791         echo <<<HTML
1792 <!DOCTYPE NETSCAPE-Bookmark-file-1>
1793 <!-- This is an automatically generated file.
1794      It will be read and overwritten.
1795      DO NOT EDIT! -->
1796 <!-- Shaarli {$exportWhat} bookmarks export on {$currentdate} -->
1797 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
1798 <TITLE>Bookmarks</TITLE>
1799 <H1>Bookmarks</H1>
1800 HTML;
1801         foreach($LINKSDB as $link)
1802         {
1803             if ($exportWhat=='all' ||
1804                ($exportWhat=='private' && $link['private']!=0) ||
1805                ($exportWhat=='public' && $link['private']==0))
1806             {
1807                 $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
1808                 echo '<DT><A HREF="'.$link['url'].'" ADD_DATE="'.$date->getTimestamp().'" PRIVATE="'.$link['private'].'"';
1809                 if ($link['tags']!='') echo ' TAGS="'.str_replace(' ',',',$link['tags']).'"';
1810                 echo '>'.$link['title']."</A>\n";
1811                 if ($link['description']!='') echo '<DD>'.$link['description']."\n";
1812             }
1813         }
1814                 exit;
1815     }
1816
1817     // -------- User is uploading a file for import
1818     if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=upload'))
1819     {
1820         // If file is too big, some form field may be missing.
1821         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1822         {
1823             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1824             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1825             exit;
1826         }
1827         if (!tokenOk($_POST['token'])) die('Wrong token.');
1828         importFile();
1829         exit;
1830     }
1831
1832     // -------- Show upload/import dialog:
1833     if ($targetPage == Router::$PAGE_IMPORT)
1834     {
1835         $PAGE->assign('linkcount',count($LINKSDB));
1836         $PAGE->assign('token',getToken());
1837         $PAGE->assign('maxfilesize',getMaxFileSize());
1838         $PAGE->renderPage('import');
1839         exit;
1840     }
1841
1842     // Plugin administration page
1843     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1844         $pluginMeta = $pluginManager->getPluginsMeta();
1845
1846         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1847         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1848         // Load parameters.
1849         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $GLOBALS['plugins']);
1850         uasort(
1851             $enabledPlugins,
1852             function($a, $b) { return $a['order'] - $b['order']; }
1853         );
1854         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1855
1856         $PAGE->assign('enabledPlugins', $enabledPlugins);
1857         $PAGE->assign('disabledPlugins', $disabledPlugins);
1858         $PAGE->renderPage('pluginsadmin');
1859         exit;
1860     }
1861
1862     // Plugin administration form action
1863     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1864         try {
1865             if (isset($_POST['parameters_form'])) {
1866                 unset($_POST['parameters_form']);
1867                 foreach ($_POST as $param => $value) {
1868                     $GLOBALS['plugins'][$param] = escape($value);
1869                 }
1870             }
1871             else {
1872                 $GLOBALS['config']['ENABLED_PLUGINS'] = save_plugin_config($_POST);
1873             }
1874             writeConfig($GLOBALS, isLoggedIn());
1875         }
1876         catch (Exception $e) {
1877             error_log(
1878                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1879                 $e->getMessage()
1880             );
1881
1882             // TODO: do not handle exceptions/errors in JS.
1883             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do='. Router::$PAGE_PLUGINSADMIN .'\';</script>';
1884             exit;
1885         }
1886         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1887         exit;
1888     }
1889
1890     // -------- Otherwise, simply display search form and links:
1891     showLinkList($PAGE, $LINKSDB);
1892     exit;
1893 }
1894
1895 // -----------------------------------------------------------------------------------------------
1896 // Process the import file form.
1897 function importFile()
1898 {
1899     if (!isLoggedIn()) { die('Not allowed.'); }
1900     $LINKSDB = new LinkDB(
1901         $GLOBALS['config']['DATASTORE'],
1902         isLoggedIn(),
1903         $GLOBALS['config']['HIDE_PUBLIC_LINKS'],
1904         $GLOBALS['redirector']
1905     );
1906     $filename=$_FILES['filetoupload']['name'];
1907     $filesize=$_FILES['filetoupload']['size'];
1908     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1909     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1910     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1911     $import_count=0;
1912
1913     // Sniff file type:
1914     $type='unknown';
1915     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1916
1917     // Then import the bookmarks.
1918     if ($type=='netscape')
1919     {
1920         // This is a standard Netscape-style bookmark file.
1921         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1922         foreach(explode('<DT>',$data) as $html) // explode is very fast
1923         {
1924             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1925             $d = explode('<DD>',$html);
1926             if (startswith($d[0],'<A '))
1927             {
1928                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1929                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1930                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1931                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1932                 $raw_add_date=0;
1933                 foreach($matches as $m)
1934                 {
1935                     $attr=$m[1]; $value=$m[2];
1936                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1937                     elseif ($attr=='ADD_DATE')
1938                     {
1939                         $raw_add_date=intval($value);
1940                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1941                     }
1942                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1943                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1944                 }
1945                 if ($link['url']!='')
1946                 {
1947                     if ($private==1) $link['private']=1;
1948                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1949                     if ($dblink==false)
1950                     {  // Link not in database, let's import it...
1951                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1952
1953                        // Make sure date/time is not already used by another link.
1954                        // (Some bookmark files have several different links with the same ADD_DATE)
1955                        // We increment date by 1 second until we find a date which is not used in DB.
1956                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1957                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1958                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1959                        $LINKSDB[$link['linkdate']] = $link;
1960                        $import_count++;
1961                     }
1962                     else // Link already present in database.
1963                     {
1964                         if ($overwrite)
1965                         {   // If overwrite is required, we import link data, except date/time.
1966                             $link['linkdate']=$dblink['linkdate'];
1967                             $LINKSDB[$link['linkdate']] = $link;
1968                             $import_count++;
1969                         }
1970                     }
1971
1972                 }
1973             }
1974         }
1975         $LINKSDB->savedb($GLOBALS['config']['PAGECACHE']);
1976
1977         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1978     }
1979     else
1980     {
1981         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1982     }
1983 }
1984
1985 // -----------------------------------------------------------------------------------------------
1986 // Template for the list of links (<div id="linklist">)
1987 // This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1988 function buildLinkList($PAGE,$LINKSDB)
1989 {
1990     // Filter link database according to parameters.
1991     $searchtags = !empty($_GET['searchtags']) ? escape($_GET['searchtags']) : '';
1992     $searchterm = !empty($_GET['searchterm']) ? escape(trim($_GET['searchterm'])) : '';
1993     $privateonly = !empty($_SESSION['privateonly']) ? true : false;
1994
1995     // Search tags + fullsearch.
1996     if (! empty($searchtags) && ! empty($searchterm)) {
1997         $linksToDisplay = $LINKSDB->filter(
1998             LinkFilter::$FILTER_TAG | LinkFilter::$FILTER_TEXT,
1999             array($searchtags, $searchterm),
2000             false,
2001             $privateonly
2002         );
2003     }
2004     // Search by tags.
2005     elseif (! empty($searchtags)) {
2006         $linksToDisplay = $LINKSDB->filter(
2007             LinkFilter::$FILTER_TAG,
2008             $searchtags,
2009             false,
2010             $privateonly
2011         );
2012     }
2013     // Fulltext search.
2014     elseif (! empty($searchterm)) {
2015         $linksToDisplay = $LINKSDB->filter(
2016             LinkFilter::$FILTER_TEXT,
2017             $searchterm,
2018             false,
2019             $privateonly
2020         );
2021     }
2022     // Detect smallHashes in URL.
2023     elseif (! empty($_SERVER['QUERY_STRING'])
2024         && preg_match('/[a-zA-Z0-9-_@]{6}(&.+?)?/', $_SERVER['QUERY_STRING'])
2025     ) {
2026         $linksToDisplay = $LINKSDB->filter(
2027             LinkFilter::$FILTER_HASH,
2028             substr(trim($_SERVER["QUERY_STRING"], '/'), 0, 6)
2029         );
2030
2031         if (count($linksToDisplay) == 0) {
2032             $PAGE->render404('The link you are trying to reach does not exist or has been deleted.');
2033             exit;
2034         }
2035     }
2036     // Otherwise, display without filtering.
2037     else {
2038         $linksToDisplay = $LINKSDB->filter('', '', false, $privateonly);
2039     }
2040
2041     // ---- Handle paging.
2042     $keys = array();
2043     foreach ($linksToDisplay as $key => $value) {
2044         $keys[] = $key;
2045     }
2046
2047     // If there is only a single link, we change on-the-fly the title of the page.
2048     if (count($linksToDisplay) == 1) {
2049         $GLOBALS['pagetitle'] = $linksToDisplay[$keys[0]]['title'].' - '.$GLOBALS['title'];
2050     }
2051
2052     // Select articles according to paging.
2053     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
2054     $pagecount = $pagecount == 0 ? 1 : $pagecount;
2055     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
2056     $page = $page < 1 ? 1 : $page;
2057     $page = $page > $pagecount ? $pagecount : $page;
2058     // Start index.
2059     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
2060     $end = $i + $_SESSION['LINKS_PER_PAGE'];
2061     $linkDisp = array();
2062     while ($i<$end && $i<count($keys))
2063     {
2064         $link = $linksToDisplay[$keys[$i]];
2065         $link['description'] = format_description($link['description'], $GLOBALS['redirector']);
2066         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
2067         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
2068         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
2069         $link['timestamp'] = $date->getTimestamp();
2070         $taglist = explode(' ', $link['tags']);
2071         uasort($taglist, 'strcasecmp');
2072         $link['taglist'] = $taglist;
2073         $link['shorturl'] = smallHash($link['linkdate']);
2074         // Check for both signs of a note: starting with ? and 7 chars long.
2075         if ($link['url'][0] === '?' &&
2076             strlen($link['url']) === 7) {
2077             $link['url'] = index_url($_SERVER) . $link['url'];
2078         }
2079
2080         $linkDisp[$keys[$i]] = $link;
2081         $i++;
2082     }
2083
2084     // Compute paging navigation
2085     $searchtagsUrl = empty($searchtags) ? '' : '&searchtags=' . urlencode($searchtags);
2086     $searchtermUrl = empty($searchterm) ? '' : '&searchterm=' . urlencode($searchterm);
2087     $previous_page_url = '';
2088     if ($i != count($keys)) {
2089         $previous_page_url = '?page=' . ($page+1) . $searchtermUrl . $searchtagsUrl;
2090     }
2091     $next_page_url='';
2092     if ($page>1) {
2093         $next_page_url = '?page=' . ($page-1) . $searchtermUrl . $searchtagsUrl;
2094     }
2095
2096     $token = isLoggedIn() ? getToken() : '';
2097
2098     // Fill all template fields.
2099     $data = array(
2100         'linkcount' => count($LINKSDB),
2101         'previous_page_url' => $previous_page_url,
2102         'next_page_url' => $next_page_url,
2103         'page_current' => $page,
2104         'page_max' => $pagecount,
2105         'result_count' => count($linksToDisplay),
2106         'search_term' => $searchterm,
2107         'search_tags' => $searchtags,
2108         'redirector' => empty($GLOBALS['redirector']) ? '' : $GLOBALS['redirector'],  // Optional redirector URL.
2109         'token' => $token,
2110         'links' => $linkDisp,
2111         'tags' => $LINKSDB->allTags(),
2112     );
2113     // FIXME! temporary fix - see #399.
2114     if (!empty($GLOBALS['pagetitle']) && count($linkDisp) == 1) {
2115         $data['pagetitle'] = $GLOBALS['pagetitle'];
2116     }
2117
2118     $pluginManager = PluginManager::getInstance();
2119     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
2120
2121     foreach ($data as $key => $value) {
2122         $PAGE->assign($key, $value);
2123     }
2124
2125     return;
2126 }
2127
2128 // Compute the thumbnail for a link.
2129 //
2130 // With a link to the original URL.
2131 // Understands various services (youtube.com...)
2132 // Input: $url = URL for which the thumbnail must be found.
2133 //        $href = if provided, this URL will be followed instead of $url
2134 // Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
2135 // Some of them may be missing.
2136 // Return an empty array if no thumbnail available.
2137 function computeThumbnail($url,$href=false)
2138 {
2139     if (!$GLOBALS['config']['ENABLE_THUMBNAILS']) return array();
2140     if ($href==false) $href=$url;
2141
2142     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
2143     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
2144     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
2145     $domain = parse_url($url,PHP_URL_HOST);
2146     if ($domain=='youtube.com' || $domain=='www.youtube.com')
2147     {
2148         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
2149         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
2150                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2151     }
2152     if ($domain=='youtu.be') // Youtube short links
2153     {
2154         $path = parse_url($url,PHP_URL_PATH);
2155         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
2156                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
2157     }
2158     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
2159     {
2160         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
2161         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
2162                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
2163     }
2164
2165     if ($domain=='imgur.com')
2166     {
2167         $path = parse_url($url,PHP_URL_PATH);
2168         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
2169         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
2170                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2171         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
2172                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2173
2174         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
2175                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2176     }
2177     if ($domain=='i.imgur.com')
2178     {
2179         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
2180         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
2181                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
2182     }
2183     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
2184     {
2185         if (strpos($url,'dailymotion.com/video/')!==false)
2186         {
2187             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
2188             return array('src'=>$thumburl,
2189                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
2190         }
2191     }
2192     if (endsWith($domain,'.imageshack.us'))
2193     {
2194         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2195         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2196         {
2197             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
2198             return array('src'=>$thumburl,
2199                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
2200         }
2201     }
2202
2203     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
2204     // So we deport the thumbnail generation in order not to slow down page generation
2205     // (and we also cache the thumbnail)
2206
2207     if (!$GLOBALS['config']['ENABLE_LOCALCACHE']) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
2208
2209     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
2210         || $domain=='vimeo.com'
2211         || $domain=='ted.com' || endsWith($domain,'.ted.com')
2212         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
2213     )
2214     {
2215         if ($domain=='vimeo.com')
2216         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
2217             $path = parse_url($url,PHP_URL_PATH);
2218             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
2219         }
2220         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2221         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
2222             $path = parse_url($url,PHP_URL_PATH);
2223             if (!preg_match('!/\d+.+?!',$path)) return array();
2224         }
2225         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2226         {   // Make sure this TED URL points to a video (/talks/...)
2227             $path = parse_url($url,PHP_URL_PATH);
2228             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
2229         }
2230         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2231         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2232                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2233     }
2234
2235     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
2236     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
2237     // But using the extension will do.
2238     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
2239     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
2240     {
2241         $sign = hash_hmac('sha256', $url, $GLOBALS['salt']); // We use the salt to sign data (it's random, secret, and specific to each installation)
2242         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
2243                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
2244     }
2245     return array(); // No thumbnail.
2246
2247 }
2248
2249
2250 // Returns the HTML code to display a thumbnail for a link
2251 // with a link to the original URL.
2252 // Understands various services (youtube.com...)
2253 // Input: $url = URL for which the thumbnail must be found.
2254 //        $href = if provided, this URL will be followed instead of $url
2255 // Returns '' if no thumbnail available.
2256 function thumbnail($url,$href=false)
2257 {
2258     $t = computeThumbnail($url,$href);
2259     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2260
2261     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
2262     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2263     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2264     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2265     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2266     $html.='></a>';
2267     return $html;
2268 }
2269
2270 // Returns the HTML code to display a thumbnail for a link
2271 // for the picture wall (using lazy image loading)
2272 // Understands various services (youtube.com...)
2273 // Input: $url = URL for which the thumbnail must be found.
2274 //        $href = if provided, this URL will be followed instead of $url
2275 // Returns '' if no thumbnail available.
2276 function lazyThumbnail($url,$href=false)
2277 {
2278     $t = computeThumbnail($url,$href);
2279     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
2280
2281     $html='<a href="'.escape($t['href']).'">';
2282
2283     // Lazy image
2284     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
2285
2286     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2287     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2288     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2289     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2290     $html.='>';
2291
2292     // No-JavaScript fallback.
2293     $html.='<noscript><img src="'.escape($t['src']).'"';
2294     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
2295     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
2296     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
2297     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
2298     $html.='></noscript></a>';
2299
2300     return $html;
2301 }
2302
2303
2304 // -----------------------------------------------------------------------------------------------
2305 // Installation
2306 // This function should NEVER be called if the file data/config.php exists.
2307 function install()
2308 {
2309     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
2310     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
2311
2312
2313     // This part makes sure sessions works correctly.
2314     // (Because on some hosts, session.save_path may not be set correctly,
2315     // or we may not have write access to it.)
2316     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
2317     {   // Step 2: Check if data in session is correct.
2318         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
2319         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
2320         echo 'It currently points to '.session_save_path().'<br>';
2321         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
2322         echo '<br><a href="?">Click to try again.</a></pre>';
2323         die;
2324     }
2325     if (!isset($_SESSION['session_tested']))
2326     {   // Step 1 : Try to store data in session and reload page.
2327         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
2328         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
2329     }
2330     if (isset($_GET['test_session']))
2331     {   // Step 3: Sessions are OK. Remove test parameter from URL.
2332         header('Location: '.index_url($_SERVER));
2333     }
2334
2335
2336     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
2337     {
2338         $tz = 'UTC';
2339         if (!empty($_POST['continent']) && !empty($_POST['city'])) {
2340             if (isTimeZoneValid($_POST['continent'], $_POST['city'])) {
2341                 $tz = $_POST['continent'].'/'.$_POST['city'];
2342             }
2343         }
2344         $GLOBALS['timezone'] = $tz;
2345         // Everything is ok, let's create config file.
2346         $GLOBALS['login'] = $_POST['setlogin'];
2347         $GLOBALS['salt'] = sha1(uniqid('',true).'_'.mt_rand()); // Salt renders rainbow-tables attacks useless.
2348         $GLOBALS['hash'] = sha1($_POST['setpassword'].$GLOBALS['login'].$GLOBALS['salt']);
2349         $GLOBALS['title'] = (empty($_POST['title']) ? 'Shared links on '.escape(index_url($_SERVER)) : $_POST['title'] );
2350         $GLOBALS['config']['ENABLE_UPDATECHECK'] = !empty($_POST['updateCheck']);
2351         try {
2352             writeConfig($GLOBALS, isLoggedIn());
2353         }
2354         catch(Exception $e) {
2355             error_log(
2356                     'ERROR while writing config file after installation.' . PHP_EOL .
2357                     $e->getMessage()
2358                 );
2359
2360             // TODO: do not handle exceptions/errors in JS.
2361             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2362             exit;
2363         }
2364         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2365         exit;
2366     }
2367
2368     // Display config form:
2369     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2370     $timezone_html = '';
2371     if ($timezone_form != '') {
2372         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2373     }
2374
2375     $PAGE = new pageBuilder;
2376     $PAGE->assign('timezone_html',$timezone_html);
2377     $PAGE->assign('timezone_js',$timezone_js);
2378     $PAGE->renderPage('install');
2379     exit;
2380 }
2381
2382 /* Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2383    I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2384    The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2385    This function is called by passing the URL:
2386    http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2387    [URL] is the URL of the link (e.g. a flickr page)
2388    [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2389    The function below will fetch the image from the webservice and store it in the cache.
2390 */
2391 function genThumbnail()
2392 {
2393     // Make sure the parameters in the URL were generated by us.
2394     $sign = hash_hmac('sha256', $_GET['url'], $GLOBALS['salt']);
2395     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2396
2397     // Let's see if we don't already have the image for this URL in the cache.
2398     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2399     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$thumbname))
2400     {   // We have the thumbnail, just serve it:
2401         header('Content-Type: image/jpeg');
2402         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$thumbname);
2403         return;
2404     }
2405     // We may also serve a blank image (if service did not respond)
2406     $blankname=hash('sha1',$_GET['url']).'.gif';
2407     if (is_file($GLOBALS['config']['CACHEDIR'].'/'.$blankname))
2408     {
2409         header('Content-Type: image/gif');
2410         echo file_get_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname);
2411         return;
2412     }
2413
2414     // Otherwise, generate the thumbnail.
2415     $url = $_GET['url'];
2416     $domain = parse_url($url,PHP_URL_HOST);
2417
2418     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2419     {
2420         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2421         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2422
2423         // Is this a link to an image, or to a flickr page ?
2424         $imageurl='';
2425         if (endswith(parse_url($url,PHP_URL_PATH),'.jpg'))
2426         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2427             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2428             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2429         }
2430         else // This is a flickr page (html)
2431         {
2432             // Get the flickr html page.
2433             list($headers, $content) = get_http_response($url, 20);
2434             if (strpos($headers[0], '200 OK') !== false)
2435             {
2436                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2437                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2438                 if (!empty($matches[1])) $imageurl=$matches[1];
2439
2440                 // In albums (and some other pages), the link rel="image_src" is not provided,
2441                 // but flickr provides:
2442                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2443                 if ($imageurl=='')
2444                 {
2445                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2446                     if (!empty($matches[1])) $imageurl=$matches[1];
2447                 }
2448             }
2449         }
2450
2451         if ($imageurl!='')
2452         {   // Let's download the image.
2453             // Image is 240x120, so 10 seconds to download should be enough.
2454             list($headers, $content) = get_http_response($imageurl, 10);
2455             if (strpos($headers[0], '200 OK') !== false) {
2456                 // Save image to cache.
2457                 file_put_contents($GLOBALS['config']['CACHEDIR'].'/' . $thumbname, $content);
2458                 header('Content-Type: image/jpeg');
2459                 echo $content;
2460                 return;
2461             }
2462         }
2463     }
2464
2465     elseif ($domain=='vimeo.com' )
2466     {
2467         // This is more complex: we have to perform a HTTP request, then parse the result.
2468         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2469         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2470         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2471         if (strpos($headers[0], '200 OK') !== false) {
2472             $t = unserialize($content);
2473             $imageurl = $t[0]['thumbnail_medium'];
2474             // Then we download the image and serve it to our client.
2475             list($headers, $content) = get_http_response($imageurl, 10);
2476             if (strpos($headers[0], '200 OK') !== false) {
2477                 // Save image to cache.
2478                 file_put_contents($GLOBALS['config']['CACHEDIR'] . '/' . $thumbname, $content);
2479                 header('Content-Type: image/jpeg');
2480                 echo $content;
2481                 return;
2482             }
2483         }
2484     }
2485
2486     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2487     {
2488         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2489         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2490         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2491         list($headers, $content) = get_http_response($url, 5);
2492         if (strpos($headers[0], '200 OK') !== false) {
2493             // Extract the link to the thumbnail
2494             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2495             if (!empty($matches[1]))
2496             {   // Let's download the image.
2497                 $imageurl=$matches[1];
2498                 // No control on image size, so wait long enough
2499                 list($headers, $content) = get_http_response($imageurl, 20);
2500                 if (strpos($headers[0], '200 OK') !== false) {
2501                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2502                     file_put_contents($filepath, $content); // Save image to cache.
2503                     if (resizeImage($filepath))
2504                     {
2505                         header('Content-Type: image/jpeg');
2506                         echo file_get_contents($filepath);
2507                         return;
2508                     }
2509                 }
2510             }
2511         }
2512     }
2513
2514     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2515     {
2516         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2517         // http://xkcd.com/327/
2518         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2519         list($headers, $content) = get_http_response($url, 5);
2520         if (strpos($headers[0], '200 OK') !== false) {
2521             // Extract the link to the thumbnail
2522             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2523             if (!empty($matches[1]))
2524             {   // Let's download the image.
2525                 $imageurl=$matches[1];
2526                 // No control on image size, so wait long enough
2527                 list($headers, $content) = get_http_response($imageurl, 20);
2528                 if (strpos($headers[0], '200 OK') !== false) {
2529                     $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2530                     // Save image to cache.
2531                     file_put_contents($filepath, $content);
2532                     if (resizeImage($filepath))
2533                     {
2534                         header('Content-Type: image/jpeg');
2535                         echo file_get_contents($filepath);
2536                         return;
2537                     }
2538                 }
2539             }
2540         }
2541     }
2542
2543     else
2544     {
2545         // For all other domains, we try to download the image and make a thumbnail.
2546         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2547         list($headers, $content) = get_http_response($url, 30);
2548         if (strpos($headers[0], '200 OK') !== false) {
2549             $filepath=$GLOBALS['config']['CACHEDIR'].'/'.$thumbname;
2550             // Save image to cache.
2551             file_put_contents($filepath, $content);
2552             if (resizeImage($filepath))
2553             {
2554                 header('Content-Type: image/jpeg');
2555                 echo file_get_contents($filepath);
2556                 return;
2557             }
2558         }
2559     }
2560
2561
2562     // Otherwise, return an empty image (8x8 transparent gif)
2563     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2564     file_put_contents($GLOBALS['config']['CACHEDIR'].'/'.$blankname,$blankgif); // Also put something in cache so that this URL is not requested twice.
2565     header('Content-Type: image/gif');
2566     echo $blankgif;
2567 }
2568
2569 // Make a thumbnail of the image (to width: 120 pixels)
2570 // Returns true if success, false otherwise.
2571 function resizeImage($filepath)
2572 {
2573     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2574
2575     // Trick: some stupid people rename GIF as JPEG... or else.
2576     // So we really try to open each image type whatever the extension is.
2577     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2578     $im=false;
2579     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2580     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2581     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2582     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2583     $w = imagesx($im);
2584     $h = imagesy($im);
2585     $ystart = 0; $yheight=$h;
2586     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2587     $nw = 120;   // Desired width
2588     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2589     // Resize image:
2590     $im2 = imagecreatetruecolor($nw,$nh);
2591     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2592     imageinterlace($im2,true); // For progressive JPEG.
2593     $tempname=$filepath.'_TEMP.jpg';
2594     imagejpeg($im2, $tempname, 90);
2595     imagedestroy($im);
2596     imagedestroy($im2);
2597     unlink($filepath);
2598     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2599     return true;
2600 }
2601
2602 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=genthumbnail')) { genThumbnail(); exit; }  // Thumbnail generation/cache does not need the link database.
2603 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=rss')) { showRSS(); exit; }
2604 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=atom')) { showATOM(); exit; }
2605 if (isset($_SERVER["QUERY_STRING"]) && startswith($_SERVER["QUERY_STRING"],'do=dailyrss')) { showDailyRSS(); exit; }
2606 if (!isset($_SESSION['LINKS_PER_PAGE'])) $_SESSION['LINKS_PER_PAGE']=$GLOBALS['config']['LINKS_PER_PAGE'];
2607 renderPage();
2608 ?>