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