index.php

   1 <?php
   2 /**
   3  * Shaarli v0.7.0 - Shaare your links...
   4  *
   5  * The personal, minimalist, super-fast, database free, bookmarking service.
   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  * PHP configuration
  27  */
  28 define('shaarli_version', '0.7.0');
  29
  30 // http://server.com/x/shaarli --> /shaarli/
  31 define('WEB_PATH', substr($_SERVER['REQUEST_URI'], 0, 1+strrpos($_SERVER['REQUEST_URI'], '/', 0)));
  32
  33 // High execution time in case of problematic imports/exports.
  34 ini_set('max_input_time','60');
  35
  36 // Try to set max upload file size and read
  37 ini_set('memory_limit', '128M');
  38 ini_set('post_max_size', '16M');
  39 ini_set('upload_max_filesize', '16M');
  40
  41 // See all error except warnings
  42 error_reporting(E_ALL^E_WARNING);
  43 // See all errors (for debugging only)
  44 //error_reporting(-1);
  45
  46
  47 // 3rd-party libraries
  48 if (! file_exists(__DIR__ . '/vendor/autoload.php')) {
  49     header('Content-Type: text/plain; charset=utf-8');
  50     echo "Error: missing Composer configuration\n\n"
  51         ."If you installed Shaarli through Git or using the development branch,\n"
  52         ."please refer to the installation documentation to install PHP"
  53         ." dependencies using Composer:\n"
  54         ."- https://github.com/shaarli/Shaarli/wiki/Server-requirements\n"
  55         ."- https://github.com/shaarli/Shaarli/wiki/Download-and-Installation";
  56     exit;
  57 }
  58 require_once 'inc/rain.tpl.class.php';
  59 require_once __DIR__ . '/vendor/autoload.php';
  60
  61 // Shaarli library
  62 require_once 'application/ApplicationUtils.php';
  63 require_once 'application/Cache.php';
  64 require_once 'application/CachedPage.php';
  65 require_once 'application/config/ConfigManager.php';
  66 require_once 'application/config/ConfigPlugin.php';
  67 require_once 'application/FeedBuilder.php';
  68 require_once 'application/FileUtils.php';
  69 require_once 'application/HttpUtils.php';
  70 require_once 'application/Languages.php';
  71 require_once 'application/LinkDB.php';
  72 require_once 'application/LinkFilter.php';
  73 require_once 'application/LinkUtils.php';
  74 require_once 'application/NetscapeBookmarkUtils.php';
  75 require_once 'application/PageBuilder.php';
  76 require_once 'application/TimeZone.php';
  77 require_once 'application/Url.php';
  78 require_once 'application/Utils.php';
  79 require_once 'application/PluginManager.php';
  80 require_once 'application/Router.php';
  81 require_once 'application/Updater.php';
  82
  83 // Ensure the PHP version is supported
  84 try {
  85     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
  86 } catch(Exception $exc) {
  87     header('Content-Type: text/plain; charset=utf-8');
  88     echo $exc->getMessage();
  89     exit;
  90 }
  91
  92 // Force cookie path (but do not change lifetime)
  93 $cookie = session_get_cookie_params();
  94 $cookiedir = '';
  95 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
  96     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
  97 }
  98 // Set default cookie expiration and path.
  99 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
 100 // Set session parameters on server side.
 101 // If the user does not access any page within this time, his/her session is considered expired.
 102 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
 103 // Use cookies to store session.
 104 ini_set('session.use_cookies', 1);
 105 // Force cookies for session (phpsessionID forbidden in URL).
 106 ini_set('session.use_only_cookies', 1);
 107 // Prevent PHP form using sessionID in URL if cookies are disabled.
 108 ini_set('session.use_trans_sid', false);
 109
 110 session_name('shaarli');
 111 // Start session if needed (Some server auto-start sessions).
 112 if (session_id() == '') {
 113     session_start();
 114 }
 115
 116 // Regenerate session ID if invalid or not defined in cookie.
 117 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 118     session_regenerate_id(true);
 119     $_COOKIE['shaarli'] = session_id();
 120 }
 121
 122 $conf = new ConfigManager();
 123 $conf->setEmpty('general.timezone', date_default_timezone_get());
 124 $conf->setEmpty('general.title', 'Shared links on '. escape(index_url($_SERVER)));
 125 RainTPL::$tpl_dir = $conf->get('resource.raintpl_tpl'); // template directory
 126 RainTPL::$cache_dir = $conf->get('resource.raintpl_tmp'); // cache directory
 127
 128 $pluginManager = new PluginManager($conf);
 129 $pluginManager->load($conf->get('general.enabled_plugins'));
 130
 131 date_default_timezone_set($conf->get('general.timezone', 'UTC'));
 132
 133 ob_start();  // Output buffering for the page cache.
 134
 135 // In case stupid admin has left magic_quotes enabled in php.ini:
 136 if (get_magic_quotes_gpc())
 137 {
 138     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 139     $_POST = array_map('stripslashes_deep', $_POST);
 140     $_GET = array_map('stripslashes_deep', $_GET);
 141     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 142 }
 143
 144 // Prevent caching on client side or proxy: (yes, it's ugly)
 145 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 146 header("Cache-Control: no-store, no-cache, must-revalidate");
 147 header("Cache-Control: post-check=0, pre-check=0", false);
 148 header("Pragma: no-cache");
 149
 150 if (! is_file($conf->getConfigFileExt())) {
 151     // Ensure Shaarli has proper access to its resources
 152     $errors = ApplicationUtils::checkResourcePermissions($conf);
 153
 154     if ($errors != array()) {
 155         $message = '<p>Insufficient permissions:</p><ul>';
 156
 157         foreach ($errors as $error) {
 158             $message .= '<li>'.$error.'</li>';
 159         }
 160         $message .= '</ul>';
 161
 162         header('Content-Type: text/html; charset=utf-8');
 163         echo $message;
 164         exit;
 165     }
 166
 167     // Display the installation form if no existing config is found
 168     install($conf);
 169 }
 170
 171 // a token depending of deployment salt, user password, and the current ip
 172 define('STAY_SIGNED_IN_TOKEN', sha1($conf->get('credentials.hash') . $_SERVER['REMOTE_ADDR'] . $conf->get('credentials.salt')));
 173
 174 // Sniff browser language and set date format accordingly.
 175 if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
 176     autoLocale($_SERVER['HTTP_ACCEPT_LANGUAGE']);
 177 }
 178 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 179
 180 /**
 181  * Checking session state (i.e. is the user still logged in)
 182  *
 183  * @param ConfigManager $conf The configuration manager.
 184  *
 185  * @return bool: true if the user is logged in, false otherwise.
 186  */
 187 function setup_login_state($conf)
 188 {
 189         if ($conf->get('security.open_shaarli')) {
 190             return true;
 191         }
 192         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 193         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 194         if (! $conf->exists('credentials.login')) {
 195             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 196             $loginFailure = true;
 197         }
 198         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 199             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 200             !$loginFailure)
 201         {
 202             fillSessionInfo($conf);
 203             $userIsLoggedIn = true;
 204         }
 205         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 206         if (empty($_SESSION['uid'])
 207         || ($conf->get('security.session_protection_disabled') == false && $_SESSION['ip'] != allIPs())
 208         || time() >= $_SESSION['expires_on'])
 209         {
 210             logout();
 211             $userIsLoggedIn = false;
 212             $loginFailure = true;
 213         }
 214         if (!empty($_SESSION['longlastingsession'])) {
 215             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 216         }
 217         else {
 218             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 219         }
 220         if (!$loginFailure) {
 221             $userIsLoggedIn = true;
 222         }
 223
 224         return $userIsLoggedIn;
 225 }
 226 $userIsLoggedIn = setup_login_state($conf);
 227
 228 /**
 229  * PubSubHubbub protocol support (if enabled)  [UNTESTED]
 230  * (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 231  *
 232  * @param ConfigManager $conf Configuration Manager instance.
 233  */
 234 function pubsubhub($conf)
 235 {
 236     $pshUrl = $conf->get('config.PUBSUBHUB_URL');
 237     if (!empty($pshUrl))
 238     {
 239         include_once './publisher.php';
 240         $p = new Publisher($pshUrl);
 241         $topic_url = array (
 242             index_url($_SERVER).'?do=atom',
 243             index_url($_SERVER).'?do=rss'
 244         );
 245         $p->publish_update($topic_url);
 246     }
 247 }
 248
 249 // ------------------------------------------------------------------------------------------
 250 // Session management
 251
 252 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 253 function allIPs()
 254 {
 255     $ip = $_SERVER['REMOTE_ADDR'];
 256     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 257     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 258     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 259     return $ip;
 260 }
 261
 262 /**
 263  * Load user session.
 264  *
 265  * @param ConfigManager $conf Configuration Manager instance.
 266  */
 267 function fillSessionInfo($conf)
 268 {
 269         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 270         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 271         $_SESSION['username']= $conf->get('credentials.login');
 272         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 273 }
 274
 275 /**
 276  * Check that user/password is correct.
 277  *
 278  * @param string        $login    Username
 279  * @param string        $password User password
 280  * @param ConfigManager $conf     Configuration Manager instance.
 281  *
 282  * @return bool: authentication successful or not.
 283  */
 284 function check_auth($login, $password, $conf)
 285 {
 286     $hash = sha1($password . $login . $conf->get('credentials.salt'));
 287     if ($login == $conf->get('credentials.login') && $hash == $conf->get('credentials.hash'))
 288     {   // Login/password is correct.
 289                 fillSessionInfo($conf);
 290         logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Login successful');
 291         return true;
 292     }
 293     logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Login failed for user '.$login);
 294     return false;
 295 }
 296
 297 // Returns true if the user is logged in.
 298 function isLoggedIn()
 299 {
 300     global $userIsLoggedIn;
 301     return $userIsLoggedIn;
 302 }
 303
 304 // Force logout.
 305 function logout() {
 306     if (isset($_SESSION)) {
 307         unset($_SESSION['uid']);
 308         unset($_SESSION['ip']);
 309         unset($_SESSION['username']);
 310         unset($_SESSION['privateonly']);
 311     }
 312     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 313 }
 314
 315
 316 // ------------------------------------------------------------------------------------------
 317 // Brute force protection system
 318 // Several consecutive failed logins will ban the IP address for 30 minutes.
 319 if (!is_file($conf->get('resource.ban_file', 'data/ipbans.php'))) {
 320     // FIXME! globals
 321     file_put_contents(
 322         $conf->get('resource.ban_file', 'data/ipbans.php'),
 323         "<?php\n\$GLOBALS['IPBANS']=".var_export(array('FAILURES'=>array(),'BANS'=>array()),true).";\n?>"
 324     );
 325 }
 326 include $conf->get('resource.ban_file', 'data/ipbans.php');
 327 /**
 328  * Signal a failed login. Will ban the IP if too many failures:
 329  *
 330  * @param ConfigManager $conf Configuration Manager instance.
 331  */
 332 function ban_loginFailed($conf)
 333 {
 334     $ip = $_SERVER['REMOTE_ADDR'];
 335     $gb = $GLOBALS['IPBANS'];
 336     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 337     $gb['FAILURES'][$ip]++;
 338     if ($gb['FAILURES'][$ip] > ($conf->get('security.ban_after') - 1))
 339     {
 340         $gb['BANS'][$ip] = time() + $conf->get('security.ban_after', 1800);
 341         logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'IP address banned from login');
 342     }
 343     $GLOBALS['IPBANS'] = $gb;
 344     file_put_contents(
 345         $conf->get('resource.ban_file', 'data/ipbans.php'),
 346         "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 347     );
 348 }
 349
 350 /**
 351  * Signals a successful login. Resets failed login counter.
 352  *
 353  * @param ConfigManager $conf Configuration Manager instance.
 354  */
 355 function ban_loginOk($conf)
 356 {
 357     $ip = $_SERVER['REMOTE_ADDR'];
 358     $gb = $GLOBALS['IPBANS'];
 359     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 360     $GLOBALS['IPBANS'] = $gb;
 361     file_put_contents(
 362         $conf->get('resource.ban_file', 'data/ipbans.php'),
 363         "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 364     );
 365 }
 366
 367 /**
 368  * Checks if the user CAN login. If 'true', the user can try to login.
 369  *
 370  * @param ConfigManager $conf Configuration Manager instance.
 371  *
 372  * @return bool: true if the user is allowed to login.
 373  */
 374 function ban_canLogin($conf)
 375 {
 376     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 377     if (isset($gb['BANS'][$ip]))
 378     {
 379         // User is banned. Check if the ban has expired:
 380         if ($gb['BANS'][$ip]<=time())
 381         {   // Ban expired, user can try to login again.
 382             logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Ban lifted.');
 383             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 384             file_put_contents(
 385                 $conf->get('resource.ban_file', 'data/ipbans.php'),
 386                 "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 387             );
 388             return true; // Ban has expired, user can login.
 389         }
 390         return false; // User is banned.
 391     }
 392     return true; // User is not banned.
 393 }
 394
 395 // ------------------------------------------------------------------------------------------
 396 // Process login form: Check if login/password is correct.
 397 if (isset($_POST['login']))
 398 {
 399     if (!ban_canLogin($conf)) die('I said: NO. You are banned for the moment. Go away.');
 400     if (isset($_POST['password'])
 401         && tokenOk($_POST['token'])
 402         && (check_auth($_POST['login'], $_POST['password'], $conf))
 403     ) {   // Login/password is OK.
 404         ban_loginOk($conf);
 405         // If user wants to keep the session cookie even after the browser closes:
 406         if (!empty($_POST['longlastingsession']))
 407         {
 408                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 409             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 410             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 411
 412             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 413             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 414             // Note: Never forget the trailing slash on the cookie path!
 415             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 416         }
 417         else // Standard session expiration (=when browser closes)
 418         {
 419             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 420             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 421             session_regenerate_id(true);
 422         }
 423
 424         // Optional redirect after login:
 425         if (isset($_GET['post'])) {
 426             $uri = '?post='. urlencode($_GET['post']);
 427             foreach (array('description', 'source', 'title') as $param) {
 428                 if (!empty($_GET[$param])) {
 429                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 430                 }
 431             }
 432             header('Location: '. $uri);
 433             exit;
 434         }
 435
 436         if (isset($_GET['edit_link'])) {
 437             header('Location: ?edit_link='. escape($_GET['edit_link']));
 438             exit;
 439         }
 440
 441         if (isset($_POST['returnurl'])) {
 442             // Prevent loops over login screen.
 443             if (strpos($_POST['returnurl'], 'do=login') === false) {
 444                 header('Location: '. generateLocation($_POST['returnurl'], $_SERVER['HTTP_HOST']));
 445                 exit;
 446             }
 447         }
 448         header('Location: ?'); exit;
 449     }
 450     else
 451     {
 452         ban_loginFailed($conf);
 453         $redir = '&username='. $_POST['login'];
 454         if (isset($_GET['post'])) {
 455             $redir .= '&post=' . urlencode($_GET['post']);
 456             foreach (array('description', 'source', 'title') as $param) {
 457                 if (!empty($_GET[$param])) {
 458                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 459                 }
 460             }
 461         }
 462         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 463         exit;
 464     }
 465 }
 466
 467 // ------------------------------------------------------------------------------------------
 468 // Misc utility functions:
 469
 470 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 471 function return_bytes($val)
 472 {
 473     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 474     switch($last)
 475     {
 476         case 'g': $val *= 1024;
 477         case 'm': $val *= 1024;
 478         case 'k': $val *= 1024;
 479     }
 480     return $val;
 481 }
 482
 483 // Try to determine max file size for uploads (POST).
 484 // Returns an integer (in bytes)
 485 function getMaxFileSize()
 486 {
 487     $size1 = return_bytes(ini_get('post_max_size'));
 488     $size2 = return_bytes(ini_get('upload_max_filesize'));
 489     // Return the smaller of two:
 490     $maxsize = min($size1,$size2);
 491     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 492     return $maxsize;
 493 }
 494
 495 // ------------------------------------------------------------------------------------------
 496 // Token management for XSRF protection
 497 // Token should be used in any form which acts on data (create,update,delete,import...).
 498 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 499
 500 /**
 501  * Returns a token.
 502  *
 503  * @param ConfigManager $conf Configuration Manager instance.
 504  *
 505  * @return string token.
 506  */
 507 function getToken($conf)
 508 {
 509     $rnd = sha1(uniqid('', true) .'_'. mt_rand() . $conf->get('credentials.salt'));  // We generate a random string.
 510     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 511     return $rnd;
 512 }
 513
 514 // Tells if a token is OK. Using this function will destroy the token.
 515 // true=token is OK.
 516 function tokenOk($token)
 517 {
 518     if (isset($_SESSION['tokens'][$token]))
 519     {
 520         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 521         return true; // Token is OK.
 522     }
 523     return false; // Wrong token, or already used.
 524 }
 525
 526 /**
 527  * Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 528  * Gives the last 7 days (which have links).
 529  * This RSS feed cannot be filtered.
 530  *
 531  * @param ConfigManager $conf Configuration Manager instance.
 532  */
 533 function showDailyRSS($conf) {
 534     // Cache system
 535     $query = $_SERVER['QUERY_STRING'];
 536     $cache = new CachedPage(
 537         $conf->get('config.PAGE_CACHE'),
 538         page_url($_SERVER),
 539         startsWith($query,'do=dailyrss') && !isLoggedIn()
 540     );
 541     $cached = $cache->cachedVersion();
 542     if (!empty($cached)) {
 543         echo $cached;
 544         exit;
 545     }
 546
 547     // If cached was not found (or not usable), then read the database and build the response:
 548     // Read links from database (and filter private links if used it not logged in).
 549     $LINKSDB = new LinkDB(
 550         $conf->get('resource.datastore'),
 551         isLoggedIn(),
 552         $conf->get('privacy.hide_public_links'),
 553         $conf->get('redirector.url'),
 554         $conf->get('redirector.encode_url')
 555     );
 556
 557     /* Some Shaarlies may have very few links, so we need to look
 558        back in time (rsort()) until we have enough days ($nb_of_days).
 559     */
 560     $linkdates = array();
 561     foreach ($LINKSDB as $linkdate => $value) {
 562         $linkdates[] = $linkdate;
 563     }
 564     rsort($linkdates);
 565     $nb_of_days = 7; // We take 7 days.
 566     $today = date('Ymd');
 567     $days = array();
 568
 569     foreach ($linkdates as $linkdate) {
 570         $day = substr($linkdate, 0, 8); // Extract day (without time)
 571         if (strcmp($day,$today) < 0) {
 572             if (empty($days[$day])) {
 573                 $days[$day] = array();
 574             }
 575             $days[$day][] = $linkdate;
 576         }
 577
 578         if (count($days) > $nb_of_days) {
 579             break; // Have we collected enough days?
 580         }
 581     }
 582
 583     // Build the RSS feed.
 584     header('Content-Type: application/rss+xml; charset=utf-8');
 585     $pageaddr = escape(index_url($_SERVER));
 586     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 587     echo '<channel>';
 588     echo '<title>Daily - '. $conf->get('general.title') . '</title>';
 589     echo '<link>'. $pageaddr .'</link>';
 590     echo '<description>Daily shared links</description>';
 591     echo '<language>en-en</language>';
 592     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 593
 594     // For each day.
 595     foreach ($days as $day => $linkdates) {
 596         $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 597         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 598
 599         // Build the HTML body of this RSS entry.
 600         $html = '';
 601         $href = '';
 602         $links = array();
 603
 604         // We pre-format some fields for proper output.
 605         foreach ($linkdates as $linkdate) {
 606             $l = $LINKSDB[$linkdate];
 607             $l['formatedDescription'] = format_description($l['description'], $conf->get('redirector.url'));
 608             $l['thumbnail'] = thumbnail($conf, $l['url']);
 609             $l_date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $l['linkdate']);
 610             $l['timestamp'] = $l_date->getTimestamp();
 611             if (startsWith($l['url'], '?')) {
 612                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 613             }
 614             $links[$linkdate] = $l;
 615         }
 616
 617         // Then build the HTML for this day:
 618         $tpl = new RainTPL;
 619         $tpl->assign('title', $conf->get('general.title'));
 620         $tpl->assign('daydate', $dayDate->getTimestamp());
 621         $tpl->assign('absurl', $absurl);
 622         $tpl->assign('links', $links);
 623         $tpl->assign('rssdate', escape($dayDate->format(DateTime::RSS)));
 624         $tpl->assign('hide_timestamps', $conf->get('privacy.hide_timestamps', false));
 625         $html = $tpl->draw('dailyrss', $return_string=true);
 626
 627         echo $html . PHP_EOL;
 628     }
 629     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
 630
 631     $cache->cache(ob_get_contents());
 632     ob_end_flush();
 633     exit;
 634 }
 635
 636 /**
 637  * Show the 'Daily' page.
 638  *
 639  * @param PageBuilder   $pageBuilder   Template engine wrapper.
 640  * @param LinkDB        $LINKSDB       LinkDB instance.
 641  * @param ConfigManager $conf          Configuration Manager instance.
 642  * @param PluginManager $pluginManager Plugin Manager instane.
 643  */
 644 function showDaily($pageBuilder, $LINKSDB, $conf, $pluginManager)
 645 {
 646     $day=date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 647     if (isset($_GET['day'])) $day=$_GET['day'];
 648
 649     $days = $LINKSDB->days();
 650     $i = array_search($day,$days);
 651     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
 652     $previousday='';
 653     $nextday='';
 654     if ($i!==false)
 655     {
 656         if ($i>=1) $previousday=$days[$i-1];
 657         if ($i<count($days)-1) $nextday=$days[$i+1];
 658     }
 659
 660     try {
 661         $linksToDisplay = $LINKSDB->filterDay($day);
 662     } catch (Exception $exc) {
 663         error_log($exc);
 664         $linksToDisplay = array();
 665     }
 666
 667     // We pre-format some fields for proper output.
 668     foreach($linksToDisplay as $key=>$link)
 669     {
 670
 671         $taglist = explode(' ',$link['tags']);
 672         uasort($taglist, 'strcasecmp');
 673         $linksToDisplay[$key]['taglist']=$taglist;
 674         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $conf->get('redirector.url'));
 675         $linksToDisplay[$key]['thumbnail'] = thumbnail($conf, $link['url']);
 676         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
 677         $linksToDisplay[$key]['timestamp'] = $date->getTimestamp();
 678     }
 679
 680     /* We need to spread the articles on 3 columns.
 681        I did not want to use a JavaScript lib like http://masonry.desandro.com/
 682        so I manually spread entries with a simple method: I roughly evaluate the
 683        height of a div according to title and description length.
 684     */
 685     $columns=array(array(),array(),array()); // Entries to display, for each column.
 686     $fill=array(0,0,0);  // Rough estimate of columns fill.
 687     foreach($linksToDisplay as $key=>$link)
 688     {
 689         // Roughly estimate length of entry (by counting characters)
 690         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
 691         // Description: 836 characters gives roughly 342 pixel height.
 692         // This is not perfect, but it's usually OK.
 693         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
 694         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
 695         // Then put in column which is the less filled:
 696         $smallest=min($fill); // find smallest value in array.
 697         $index=array_search($smallest,$fill); // find index of this smallest value.
 698         array_push($columns[$index],$link); // Put entry in this column.
 699         $fill[$index]+=$length;
 700     }
 701
 702     $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 703     $data = array(
 704         'linksToDisplay' => $linksToDisplay,
 705         'cols' => $columns,
 706         'day' => $dayDate->getTimestamp(),
 707         'previousday' => $previousday,
 708         'nextday' => $nextday,
 709     );
 710
 711     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
 712
 713     foreach ($data as $key => $value) {
 714         $pageBuilder->assign($key, $value);
 715     }
 716
 717     $pageBuilder->renderPage('daily');
 718     exit;
 719 }
 720
 721 /**
 722  * Renders the linklist
 723  *
 724  * @param pageBuilder   $PAGE    pageBuilder instance.
 725  * @param LinkDB        $LINKSDB LinkDB instance.
 726  * @param ConfigManager $conf    Configuration Manager instance.
 727  * @param PluginManager $pluginManager Plugin Manager instance.
 728  */
 729 function showLinkList($PAGE, $LINKSDB, $conf, $pluginManager) {
 730     buildLinkList($PAGE,$LINKSDB, $conf, $pluginManager); // Compute list of links to display
 731     $PAGE->renderPage('linklist');
 732 }
 733
 734 /**
 735  * Render HTML page (according to URL parameters and user rights)
 736  *
 737  * @param ConfigManager $conf          Configuration Manager instance.
 738  * @param PluginManager $pluginManager Plugin Manager instance,
 739  */
 740 function renderPage($conf, $pluginManager)
 741 {
 742     $LINKSDB = new LinkDB(
 743         $conf->get('resource.datastore'),
 744         isLoggedIn(),
 745         $conf->get('privacy.hide_public_links'),
 746         $conf->get('redirector.url'),
 747         $conf->get('redirector.encode_url')
 748     );
 749
 750     $updater = new Updater(
 751         read_updates_file($conf->get('resource.updates')),
 752         $LINKSDB,
 753         $conf,
 754         isLoggedIn()
 755     );
 756     try {
 757         $newUpdates = $updater->update();
 758         if (! empty($newUpdates)) {
 759             write_updates_file(
 760                 $conf->get('resource.updates'),
 761                 $updater->getDoneUpdates()
 762             );
 763         }
 764     }
 765     catch(Exception $e) {
 766         die($e->getMessage());
 767     }
 768
 769     $PAGE = new PageBuilder($conf);
 770     $PAGE->assign('linkcount', count($LINKSDB));
 771     $PAGE->assign('privateLinkcount', count_private($LINKSDB));
 772
 773     // Determine which page will be rendered.
 774     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
 775     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
 776
 777     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
 778     // Then assign generated data to RainTPL.
 779     $common_hooks = array(
 780         'includes',
 781         'header',
 782         'footer',
 783     );
 784
 785     foreach($common_hooks as $name) {
 786         $plugin_data = array();
 787         $pluginManager->executeHooks('render_' . $name, $plugin_data,
 788             array(
 789                 'target' => $targetPage,
 790                 'loggedin' => isLoggedIn()
 791             )
 792         );
 793         $PAGE->assign('plugins_' . $name, $plugin_data);
 794     }
 795
 796     // -------- Display login form.
 797     if ($targetPage == Router::$PAGE_LOGIN)
 798     {
 799         if ($conf->get('security.open_shaarli')) { header('Location: ?'); exit; }  // No need to login for open Shaarli
 800         if (isset($_GET['username'])) {
 801             $PAGE->assign('username', escape($_GET['username']));
 802         }
 803         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
 804         $PAGE->renderPage('loginform');
 805         exit;
 806     }
 807     // -------- User wants to logout.
 808     if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=logout'))
 809     {
 810         invalidateCaches($conf->get('resource.page_cache'));
 811         logout();
 812         header('Location: ?');
 813         exit;
 814     }
 815
 816     // -------- Picture wall
 817     if ($targetPage == Router::$PAGE_PICWALL)
 818     {
 819         // Optionally filter the results:
 820         $links = $LINKSDB->filterSearch($_GET);
 821         $linksToDisplay = array();
 822
 823         // Get only links which have a thumbnail.
 824         foreach($links as $link)
 825         {
 826             $permalink='?'.escape(smallhash($link['linkdate']));
 827             $thumb=lazyThumbnail($conf, $link['url'],$permalink);
 828             if ($thumb!='') // Only output links which have a thumbnail.
 829             {
 830                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
 831                 $linksToDisplay[]=$link; // Add to array.
 832             }
 833         }
 834
 835         $data = array(
 836             'linksToDisplay' => $linksToDisplay,
 837         );
 838         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
 839
 840         foreach ($data as $key => $value) {
 841             $PAGE->assign($key, $value);
 842         }
 843
 844         $PAGE->renderPage('picwall');
 845         exit;
 846     }
 847
 848     // -------- Tag cloud
 849     if ($targetPage == Router::$PAGE_TAGCLOUD)
 850     {
 851         $tags= $LINKSDB->allTags();
 852
 853         // We sort tags alphabetically, then choose a font size according to count.
 854         // First, find max value.
 855         $maxcount = 0;
 856         foreach ($tags as $value) {
 857             $maxcount = max($maxcount, $value);
 858         }
 859
 860         // Sort tags alphabetically: case insensitive, support locale if avalaible.
 861         uksort($tags, function($a, $b) {
 862             // Collator is part of PHP intl.
 863             if (class_exists('Collator')) {
 864                 $c = new Collator(setlocale(LC_COLLATE, 0));
 865                 if (!intl_is_failure(intl_get_error_code())) {
 866                     return $c->compare($a, $b);
 867                 }
 868             }
 869             return strcasecmp($a, $b);
 870         });
 871
 872         $tagList = array();
 873         foreach($tags as $key => $value) {
 874             // Tag font size scaling:
 875             //   default 15 and 30 logarithm bases affect scaling,
 876             //   22 and 6 are arbitrary font sizes for max and min sizes.
 877             $size = log($value, 15) / log($maxcount, 30) * 2.2 + 0.8;
 878             $tagList[$key] = array(
 879                 'count' => $value,
 880                 'size' => number_format($size, 2, '.', ''),
 881             );
 882         }
 883
 884         $data = array(
 885             'tags' => $tagList,
 886         );
 887         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
 888
 889         foreach ($data as $key => $value) {
 890             $PAGE->assign($key, $value);
 891         }
 892
 893         $PAGE->renderPage('tagcloud');
 894         exit;
 895     }
 896
 897     // Daily page.
 898     if ($targetPage == Router::$PAGE_DAILY) {
 899         showDaily($PAGE, $LINKSDB, $conf, $pluginManager);
 900     }
 901
 902     // ATOM and RSS feed.
 903     if ($targetPage == Router::$PAGE_FEED_ATOM || $targetPage == Router::$PAGE_FEED_RSS) {
 904         $feedType = $targetPage == Router::$PAGE_FEED_RSS ? FeedBuilder::$FEED_RSS : FeedBuilder::$FEED_ATOM;
 905         header('Content-Type: application/'. $feedType .'+xml; charset=utf-8');
 906
 907         // Cache system
 908         $query = $_SERVER['QUERY_STRING'];
 909         $cache = new CachedPage(
 910             $conf->get('resource.page_cache'),
 911             page_url($_SERVER),
 912             startsWith($query,'do='. $targetPage) && !isLoggedIn()
 913         );
 914         $cached = $cache->cachedVersion();
 915         if (!empty($cached)) {
 916             echo $cached;
 917             exit;
 918         }
 919
 920         // Generate data.
 921         $feedGenerator = new FeedBuilder($LINKSDB, $feedType, $_SERVER, $_GET, isLoggedIn());
 922         $feedGenerator->setLocale(strtolower(setlocale(LC_COLLATE, 0)));
 923         $feedGenerator->setHideDates($conf->get('privacy.hide_timestamps') && !isLoggedIn());
 924         $feedGenerator->setUsePermalinks(isset($_GET['permalinks']) || !$conf->get('feed.rss_permalinks'));
 925         $pshUrl = $conf->get('config.PUBSUBHUB_URL');
 926         if (!empty($pshUrl)) {
 927             $feedGenerator->setPubsubhubUrl($pshUrl);
 928         }
 929         $data = $feedGenerator->buildData();
 930
 931         // Process plugin hook.
 932         $pluginManager->executeHooks('render_feed', $data, array(
 933             'loggedin' => isLoggedIn(),
 934             'target' => $targetPage,
 935         ));
 936
 937         // Render the template.
 938         $PAGE->assignAll($data);
 939         $PAGE->renderPage('feed.'. $feedType);
 940         $cache->cache(ob_get_contents());
 941         ob_end_flush();
 942         exit;
 943     }
 944
 945     // Display openseach plugin (XML)
 946     if ($targetPage == Router::$PAGE_OPENSEARCH) {
 947         header('Content-Type: application/xml; charset=utf-8');
 948         $PAGE->assign('serverurl', index_url($_SERVER));
 949         $PAGE->renderPage('opensearch');
 950         exit;
 951     }
 952
 953     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
 954     if (isset($_GET['addtag']))
 955     {
 956         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
 957         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
 958         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
 959
 960         // Prevent redirection loop
 961         if (isset($params['addtag'])) {
 962             unset($params['addtag']);
 963         }
 964
 965         // Check if this tag is already in the search query and ignore it if it is.
 966         // Each tag is always separated by a space
 967         if (isset($params['searchtags'])) {
 968             $current_tags = explode(' ', $params['searchtags']);
 969         } else {
 970             $current_tags = array();
 971         }
 972         $addtag = true;
 973         foreach ($current_tags as $value) {
 974             if ($value === $_GET['addtag']) {
 975                 $addtag = false;
 976                 break;
 977             }
 978         }
 979         // Append the tag if necessary
 980         if (empty($params['searchtags'])) {
 981             $params['searchtags'] = trim($_GET['addtag']);
 982         }
 983         else if ($addtag) {
 984             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
 985         }
 986
 987         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
 988         header('Location: ?'.http_build_query($params));
 989         exit;
 990     }
 991
 992     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
 993     if (isset($_GET['removetag'])) {
 994         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
 995         if (empty($_SERVER['HTTP_REFERER'])) {
 996             header('Location: ?');
 997             exit;
 998         }
 999
1000         // In case browser does not send HTTP_REFERER
1001         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
1002
1003         // Prevent redirection loop
1004         if (isset($params['removetag'])) {
1005             unset($params['removetag']);
1006         }
1007
1008         if (isset($params['searchtags'])) {
1009             $tags = explode(' ', $params['searchtags']);
1010             // Remove value from array $tags.
1011             $tags = array_diff($tags, array($_GET['removetag']));
1012             $params['searchtags'] = implode(' ',$tags);
1013
1014             if (empty($params['searchtags'])) {
1015                 unset($params['searchtags']);
1016             }
1017
1018             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1019         }
1020         header('Location: ?'.http_build_query($params));
1021         exit;
1022     }
1023
1024     // -------- User wants to change the number of links per page (linksperpage=...)
1025     if (isset($_GET['linksperpage'])) {
1026         if (is_numeric($_GET['linksperpage'])) {
1027             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1028         }
1029
1030         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1031         exit;
1032     }
1033
1034     // -------- User wants to see only private links (toggle)
1035     if (isset($_GET['privateonly'])) {
1036         if (empty($_SESSION['privateonly'])) {
1037             $_SESSION['privateonly'] = 1; // See only private links
1038         } else {
1039             unset($_SESSION['privateonly']); // See all links
1040         }
1041
1042         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1043         exit;
1044     }
1045
1046     // -------- Handle other actions allowed for non-logged in users:
1047     if (!isLoggedIn())
1048     {
1049         // User tries to post new link but is not logged in:
1050         // Show login screen, then redirect to ?post=...
1051         if (isset($_GET['post']))
1052         {
1053             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1054             exit;
1055         }
1056
1057         showLinkList($PAGE, $LINKSDB, $conf, $pluginManager);
1058         if (isset($_GET['edit_link'])) {
1059             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1060             exit;
1061         }
1062
1063         exit; // Never remove this one! All operations below are reserved for logged in user.
1064     }
1065
1066     // -------- All other functions are reserved for the registered user:
1067
1068     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1069     if ($targetPage == Router::$PAGE_TOOLS)
1070     {
1071         $data = array(
1072             'pageabsaddr' => index_url($_SERVER),
1073         );
1074         $pluginManager->executeHooks('render_tools', $data);
1075
1076         foreach ($data as $key => $value) {
1077             $PAGE->assign($key, $value);
1078         }
1079
1080         $PAGE->renderPage('tools');
1081         exit;
1082     }
1083
1084     // -------- User wants to change his/her password.
1085     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1086     {
1087         if ($conf->get('security.open_shaarli')) {
1088             die('You are not supposed to change a password on an Open Shaarli.');
1089         }
1090
1091         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1092         {
1093             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1094
1095             // Make sure old password is correct.
1096             $oldhash = sha1($_POST['oldpassword'].$conf->get('credentials.login').$conf->get('credentials.salt'));
1097             if ($oldhash!= $conf->get('credentials.hash')) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1098             // Save new password
1099             // Salt renders rainbow-tables attacks useless.
1100             $conf->set('credentials.salt', sha1(uniqid('', true) .'_'. mt_rand()));
1101             $conf->set('credentials.hash', sha1($_POST['setpassword'] . $conf->get('credentials.login') . $conf->get('credentials.salt')));
1102             try {
1103                 $conf->write(isLoggedIn());
1104             }
1105             catch(Exception $e) {
1106                 error_log(
1107                     'ERROR while writing config file after changing password.' . PHP_EOL .
1108                     $e->getMessage()
1109                 );
1110
1111                 // TODO: do not handle exceptions/errors in JS.
1112                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1113                 exit;
1114             }
1115             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1116             exit;
1117         }
1118         else // show the change password form.
1119         {
1120             $PAGE->renderPage('changepassword');
1121             exit;
1122         }
1123     }
1124
1125     // -------- User wants to change configuration
1126     if ($targetPage == Router::$PAGE_CONFIGURE)
1127     {
1128         if (!empty($_POST['title']) )
1129         {
1130             if (!tokenOk($_POST['token'])) {
1131                 die('Wrong token.'); // Go away!
1132             }
1133             $tz = 'UTC';
1134             if (!empty($_POST['continent']) && !empty($_POST['city'])
1135                 && isTimeZoneValid($_POST['continent'], $_POST['city'])
1136             ) {
1137                 $tz = $_POST['continent'] . '/' . $_POST['city'];
1138             }
1139             $conf->set('general.timezone', $tz);
1140             $conf->set('general.title', escape($_POST['title']));
1141             $conf->set('general.header_link', escape($_POST['titleLink']));
1142             $conf->set('redirector.url', escape($_POST['redirector']));
1143             $conf->set('security.session_protection_disabled', !empty($_POST['disablesessionprotection']));
1144             $conf->set('privacy.default_private_links', !empty($_POST['privateLinkByDefault']));
1145             $conf->set('feed.rss_permalinks', !empty($_POST['enableRssPermalinks']));
1146             $conf->set('updates.check_updates', !empty($_POST['updateCheck']));
1147             $conf->set('privacy.hide_public_links', !empty($_POST['hidePublicLinks']));
1148             try {
1149                 $conf->write(isLoggedIn());
1150             }
1151             catch(Exception $e) {
1152                 error_log(
1153                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1154                     $e->getMessage()
1155                 );
1156
1157                 // TODO: do not handle exceptions/errors in JS.
1158                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=configure\';</script>';
1159                 exit;
1160             }
1161             echo '<script>alert("Configuration was saved.");document.location=\'?do=configure\';</script>';
1162             exit;
1163         }
1164         else // Show the configuration form.
1165         {
1166             $PAGE->assign('title', $conf->get('general.title'));
1167             $PAGE->assign('redirector', $conf->get('redirector.url'));
1168             list($timezone_form, $timezone_js) = generateTimeZoneForm($conf->get('general.timezone'));
1169             $PAGE->assign('timezone_form', $timezone_form);
1170             $PAGE->assign('timezone_js',$timezone_js);
1171             $PAGE->assign('private_links_default', $conf->get('privacy.default_private_links', false));
1172             $PAGE->assign('session_protection_disabled', $conf->get('security.session_protection_disabled', false));
1173             $PAGE->assign('enable_rss_permalinks', $conf->get('feed.rss_permalinks', false));
1174             $PAGE->assign('enable_update_check', $conf->get('updates.check_updates', true));
1175             $PAGE->assign('hide_public_links', $conf->get('privacy.hide_public_links', false));
1176             $PAGE->renderPage('configure');
1177             exit;
1178         }
1179     }
1180
1181     // -------- User wants to rename a tag or delete it
1182     if ($targetPage == Router::$PAGE_CHANGETAG)
1183     {
1184         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1185             $PAGE->assign('tags', $LINKSDB->allTags());
1186             $PAGE->renderPage('changetag');
1187             exit;
1188         }
1189
1190         if (!tokenOk($_POST['token'])) {
1191             die('Wrong token.');
1192         }
1193
1194         // Delete a tag:
1195         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1196             $needle = trim($_POST['fromtag']);
1197             // True for case-sensitive tag search.
1198             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1199             foreach($linksToAlter as $key=>$value)
1200             {
1201                 $tags = explode(' ',trim($value['tags']));
1202                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1203                 $value['tags']=trim(implode(' ',$tags));
1204                 $LINKSDB[$key]=$value;
1205             }
1206             $LINKSDB->savedb($conf->get('resource.page_cache'));
1207             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1208             exit;
1209         }
1210
1211         // Rename a tag:
1212         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1213             $needle = trim($_POST['fromtag']);
1214             // True for case-sensitive tag search.
1215             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1216             foreach($linksToAlter as $key=>$value)
1217             {
1218                 $tags = explode(' ',trim($value['tags']));
1219                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1220                 $value['tags']=trim(implode(' ',$tags));
1221                 $LINKSDB[$key]=$value;
1222             }
1223             $LINKSDB->savedb($conf->get('resource.page_cache')); // Save to disk.
1224             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1225             exit;
1226         }
1227     }
1228
1229     // -------- User wants to add a link without using the bookmarklet: Show form.
1230     if ($targetPage == Router::$PAGE_ADDLINK)
1231     {
1232         $PAGE->renderPage('addlink');
1233         exit;
1234     }
1235
1236     // -------- User clicked the "Save" button when editing a link: Save link to database.
1237     if (isset($_POST['save_edit']))
1238     {
1239         // Go away!
1240         if (! tokenOk($_POST['token'])) {
1241             die('Wrong token.');
1242         }
1243         // Remove multiple spaces.
1244         $tags = trim(preg_replace('/\s\s+/', ' ', $_POST['lf_tags']));
1245         // Remove first '-' char in tags.
1246         $tags = preg_replace('/(^| )\-/', '$1', $tags);
1247         // Remove duplicates.
1248         $tags = implode(' ', array_unique(explode(' ', $tags)));
1249         $linkdate = $_POST['lf_linkdate'];
1250         $url = trim($_POST['lf_url']);
1251         if (! startsWith($url, 'http:') && ! startsWith($url, 'https:')
1252             && ! startsWith($url, 'ftp:') && ! startsWith($url, 'magnet:')
1253             && ! startsWith($url, '?') && ! startsWith($url, 'javascript:')
1254         ) {
1255             $url = 'http://' . $url;
1256         }
1257
1258         $link = array(
1259             'title' => trim($_POST['lf_title']),
1260             'url' => $url,
1261             'description' => $_POST['lf_description'],
1262             'private' => (isset($_POST['lf_private']) ? 1 : 0),
1263             'linkdate' => $linkdate,
1264             'tags' => str_replace(',', ' ', $tags)
1265         );
1266         // If title is empty, use the URL as title.
1267         if ($link['title'] == '') {
1268             $link['title'] = $link['url'];
1269         }
1270
1271         $pluginManager->executeHooks('save_link', $link);
1272
1273         $LINKSDB[$linkdate] = $link;
1274         $LINKSDB->savedb($conf->get('resource.page_cache'));
1275         pubsubhub($conf);
1276
1277         // If we are called from the bookmarklet, we must close the popup:
1278         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1279             echo '<script>self.close();</script>';
1280             exit;
1281         }
1282
1283         $returnurl = !empty($_POST['returnurl']) ? $_POST['returnurl'] : '?';
1284         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1285         // Scroll to the link which has been edited.
1286         $location .= '#' . smallHash($_POST['lf_linkdate']);
1287         // After saving the link, redirect to the page the user was on.
1288         header('Location: '. $location);
1289         exit;
1290     }
1291
1292     // -------- User clicked the "Cancel" button when editing a link.
1293     if (isset($_POST['cancel_edit']))
1294     {
1295         // If we are called from the bookmarklet, we must close the popup:
1296         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1297         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1298         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1299         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1300         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1301         exit;
1302     }
1303
1304     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1305     if (isset($_POST['delete_link']))
1306     {
1307         if (!tokenOk($_POST['token'])) die('Wrong token.');
1308         // We do not need to ask for confirmation:
1309         // - confirmation is handled by JavaScript
1310         // - we are protected from XSRF by the token.
1311         $linkdate=$_POST['lf_linkdate'];
1312
1313         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1314
1315         unset($LINKSDB[$linkdate]);
1316         $LINKSDB->savedb('resource.page_cache'); // save to disk
1317
1318         // If we are called from the bookmarklet, we must close the popup:
1319         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1320         // Pick where we're going to redirect
1321         // =============================================================
1322         // Basically, we can't redirect to where we were previously if it was a permalink
1323         // or an edit_link, because it would 404.
1324         // Cases:
1325         //    - /             : nothing in $_GET, redirect to self
1326         //    - /?page        : redirect to self
1327         //    - /?searchterm  : redirect to self (there might be other links)
1328         //    - /?searchtags  : redirect to self
1329         //    - /permalink    : redirect to / (the link does not exist anymore)
1330         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1331         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1332         // redirect is not satisfied, and only then redirect to /
1333         $location = "?";
1334         // Self redirection
1335         if (count($_GET) == 0
1336             || isset($_GET['page'])
1337             || isset($_GET['searchterm'])
1338             || isset($_GET['searchtags'])
1339         ) {
1340             if (isset($_POST['returnurl'])) {
1341                 $location = $_POST['returnurl']; // Handle redirects given by the form
1342             } else {
1343                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1344             }
1345         }
1346
1347         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1348         exit;
1349     }
1350
1351     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1352     if (isset($_GET['edit_link']))
1353     {
1354         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1355         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1356         $data = array(
1357             'link' => $link,
1358             'link_is_new' => false,
1359             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1360             'tags' => $LINKSDB->allTags(),
1361         );
1362         $pluginManager->executeHooks('render_editlink', $data);
1363
1364         foreach ($data as $key => $value) {
1365             $PAGE->assign($key, $value);
1366         }
1367
1368         $PAGE->renderPage('editlink');
1369         exit;
1370     }
1371
1372     // -------- User want to post a new link: Display link edit form.
1373     if (isset($_GET['post'])) {
1374         $url = cleanup_url($_GET['post']);
1375
1376         $link_is_new = false;
1377         // Check if URL is not already in database (in this case, we will edit the existing link)
1378         $link = $LINKSDB->getLinkFromUrl($url);
1379         if (!$link)
1380         {
1381             $link_is_new = true;
1382             $linkdate = strval(date('Ymd_His'));
1383             // Get title if it was provided in URL (by the bookmarklet).
1384             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1385             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1386             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1387             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1388             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1389             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1390             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1391                 // Short timeout to keep the application responsive
1392                 list($headers, $content) = get_http_response($url, 4);
1393                 if (strpos($headers[0], '200 OK') !== false) {
1394                     // Retrieve charset.
1395                     $charset = get_charset($headers, $content);
1396                     // Extract title.
1397                     $title = html_extract_title($content);
1398                     // Re-encode title in utf-8 if necessary.
1399                     if (! empty($title) && strtolower($charset) != 'utf-8') {
1400                         $title = mb_convert_encoding($title, 'utf-8', $charset);
1401                     }
1402                 }
1403             }
1404
1405             if ($url == '') {
1406                 $url = '?' . smallHash($linkdate);
1407                 $title = 'Note: ';
1408             }
1409             $url = escape($url);
1410             $title = escape($title);
1411
1412             $link = array(
1413                 'linkdate' => $linkdate,
1414                 'title' => $title,
1415                 'url' => $url,
1416                 'description' => $description,
1417                 'tags' => $tags,
1418                 'private' => $private
1419             );
1420         }
1421
1422         $data = array(
1423             'link' => $link,
1424             'link_is_new' => $link_is_new,
1425             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1426             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1427             'tags' => $LINKSDB->allTags(),
1428             'default_private_links' => $conf->get('privacy.default_private_links', false),
1429         );
1430         $pluginManager->executeHooks('render_editlink', $data);
1431
1432         foreach ($data as $key => $value) {
1433             $PAGE->assign($key, $value);
1434         }
1435
1436         $PAGE->renderPage('editlink');
1437         exit;
1438     }
1439
1440     if ($targetPage == Router::$PAGE_EXPORT) {
1441         // Export links as a Netscape Bookmarks file
1442
1443         if (empty($_GET['selection'])) {
1444             $PAGE->renderPage('export');
1445             exit;
1446         }
1447
1448         // export as bookmarks_(all|private|public)_YYYYmmdd_HHMMSS.html
1449         $selection = $_GET['selection'];
1450         if (isset($_GET['prepend_note_url'])) {
1451             $prependNoteUrl = $_GET['prepend_note_url'];
1452         } else {
1453             $prependNoteUrl = false;
1454         }
1455
1456         try {
1457             $PAGE->assign(
1458                 'links',
1459                 NetscapeBookmarkUtils::filterAndFormat(
1460                     $LINKSDB,
1461                     $selection,
1462                     $prependNoteUrl,
1463                     index_url($_SERVER)
1464                 )
1465             );
1466         } catch (Exception $exc) {
1467             header('Content-Type: text/plain; charset=utf-8');
1468             echo $exc->getMessage();
1469             exit;
1470         }
1471         $now = new DateTime();
1472         header('Content-Type: text/html; charset=utf-8');
1473         header(
1474             'Content-disposition: attachment; filename=bookmarks_'
1475            .$selection.'_'.$now->format(LinkDB::LINK_DATE_FORMAT).'.html'
1476         );
1477         $PAGE->assign('date', $now->format(DateTime::RFC822));
1478         $PAGE->assign('eol', PHP_EOL);
1479         $PAGE->assign('selection', $selection);
1480         $PAGE->renderPage('export.bookmarks');
1481         exit;
1482     }
1483
1484     if ($targetPage == Router::$PAGE_IMPORT) {
1485         // Upload a Netscape bookmark dump to import its contents
1486
1487         if (! isset($_POST['token']) || ! isset($_FILES['filetoupload'])) {
1488             // Show import dialog
1489             $PAGE->assign('maxfilesize', getMaxFileSize());
1490             $PAGE->renderPage('import');
1491             exit;
1492         }
1493
1494         // Import bookmarks from an uploaded file
1495         if (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size'] == 0) {
1496             // The file is too big or some form field may be missing.
1497             echo '<script>alert("The file you are trying to upload is probably'
1498                 .' bigger than what this webserver can accept ('
1499                 .getMaxFileSize().' bytes).'
1500                 .' Please upload in smaller chunks.");document.location=\'?do='
1501                 .Router::$PAGE_IMPORT .'\';</script>';
1502             exit;
1503         }
1504         if (! tokenOk($_POST['token'])) {
1505             die('Wrong token.');
1506         }
1507         $status = NetscapeBookmarkUtils::import(
1508             $_POST,
1509             $_FILES,
1510             $LINKSDB,
1511             $conf->get('resource.page_cache')
1512         );
1513         echo '<script>alert("'.$status.'");document.location=\'?do='
1514              .Router::$PAGE_IMPORT .'\';</script>';
1515         exit;
1516     }
1517
1518     // Plugin administration page
1519     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1520         $pluginMeta = $pluginManager->getPluginsMeta();
1521
1522         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1523         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1524         // Load parameters.
1525         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $conf->get('plugins', array()));
1526         uasort(
1527             $enabledPlugins,
1528             function($a, $b) { return $a['order'] - $b['order']; }
1529         );
1530         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1531
1532         $PAGE->assign('enabledPlugins', $enabledPlugins);
1533         $PAGE->assign('disabledPlugins', $disabledPlugins);
1534         $PAGE->renderPage('pluginsadmin');
1535         exit;
1536     }
1537
1538     // Plugin administration form action
1539     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1540         try {
1541             if (isset($_POST['parameters_form'])) {
1542                 unset($_POST['parameters_form']);
1543                 foreach ($_POST as $param => $value) {
1544                     $conf->set('plugins.'. $param, escape($value));
1545                 }
1546             }
1547             else {
1548                 $conf->set('general.enabled_plugins', save_plugin_config($_POST));
1549             }
1550             $conf->write(isLoggedIn());
1551         }
1552         catch (Exception $e) {
1553             error_log(
1554                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1555                 $e->getMessage()
1556             );
1557
1558             // TODO: do not handle exceptions/errors in JS.
1559             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do='. Router::$PAGE_PLUGINSADMIN .'\';</script>';
1560             exit;
1561         }
1562         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1563         exit;
1564     }
1565
1566     // -------- Otherwise, simply display search form and links:
1567     showLinkList($PAGE, $LINKSDB, $conf, $pluginManager);
1568     exit;
1569 }
1570
1571 /**
1572  * Template for the list of links (<div id="linklist">)
1573  * This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1574  *
1575  * @param pageBuilder   $PAGE          pageBuilder instance.
1576  * @param LinkDB        $LINKSDB       LinkDB instance.
1577  * @param ConfigManager $conf          Configuration Manager instance.
1578  * @param PluginManager $pluginManager Plugin Manager instance.
1579  */
1580 function buildLinkList($PAGE,$LINKSDB, $conf, $pluginManager)
1581 {
1582     // Used in templates
1583     $searchtags = !empty($_GET['searchtags']) ? escape($_GET['searchtags']) : '';
1584     $searchterm = !empty($_GET['searchterm']) ? escape($_GET['searchterm']) : '';
1585
1586     // Smallhash filter
1587     if (! empty($_SERVER['QUERY_STRING'])
1588         && preg_match('/^[a-zA-Z0-9-_@]{6}($|&|#)/', $_SERVER['QUERY_STRING'])) {
1589         try {
1590             $linksToDisplay = $LINKSDB->filterHash($_SERVER['QUERY_STRING']);
1591         } catch (LinkNotFoundException $e) {
1592             $PAGE->render404($e->getMessage());
1593             exit;
1594         }
1595     } else {
1596         // Filter links according search parameters.
1597         $privateonly = !empty($_SESSION['privateonly']);
1598         $linksToDisplay = $LINKSDB->filterSearch($_GET, false, $privateonly);
1599     }
1600
1601     // ---- Handle paging.
1602     $keys = array();
1603     foreach ($linksToDisplay as $key => $value) {
1604         $keys[] = $key;
1605     }
1606
1607
1608
1609     // Select articles according to paging.
1610     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1611     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1612     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1613     $page = $page < 1 ? 1 : $page;
1614     $page = $page > $pagecount ? $pagecount : $page;
1615     // Start index.
1616     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1617     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1618     $linkDisp = array();
1619     while ($i<$end && $i<count($keys))
1620     {
1621         $link = $linksToDisplay[$keys[$i]];
1622         $link['description'] = format_description($link['description'], $conf->get('redirector.url'));
1623         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
1624         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
1625         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
1626         $link['timestamp'] = $date->getTimestamp();
1627         $taglist = explode(' ', $link['tags']);
1628         uasort($taglist, 'strcasecmp');
1629         $link['taglist'] = $taglist;
1630         $link['shorturl'] = smallHash($link['linkdate']);
1631         // Check for both signs of a note: starting with ? and 7 chars long.
1632         if ($link['url'][0] === '?' &&
1633             strlen($link['url']) === 7) {
1634             $link['url'] = index_url($_SERVER) . $link['url'];
1635         }
1636
1637         $linkDisp[$keys[$i]] = $link;
1638         $i++;
1639     }
1640
1641     // Compute paging navigation
1642     $searchtagsUrl = empty($searchtags) ? '' : '&searchtags=' . urlencode($searchtags);
1643     $searchtermUrl = empty($searchterm) ? '' : '&searchterm=' . urlencode($searchterm);
1644     $previous_page_url = '';
1645     if ($i != count($keys)) {
1646         $previous_page_url = '?page=' . ($page+1) . $searchtermUrl . $searchtagsUrl;
1647     }
1648     $next_page_url='';
1649     if ($page>1) {
1650         $next_page_url = '?page=' . ($page-1) . $searchtermUrl . $searchtagsUrl;
1651     }
1652
1653     $token = isLoggedIn() ? getToken($conf) : '';
1654
1655     // Fill all template fields.
1656     $data = array(
1657         'previous_page_url' => $previous_page_url,
1658         'next_page_url' => $next_page_url,
1659         'page_current' => $page,
1660         'page_max' => $pagecount,
1661         'result_count' => count($linksToDisplay),
1662         'search_term' => $searchterm,
1663         'search_tags' => $searchtags,
1664         'redirector' => $conf->get('redirector.url'),  // Optional redirector URL.
1665         'links' => $linkDisp,
1666         'tags' => $LINKSDB->allTags(),
1667     );
1668
1669     // If there is only a single link, we change on-the-fly the title of the page.
1670     if (count($linksToDisplay) == 1) {
1671         $data['pagetitle'] = $linksToDisplay[$keys[0]]['title'] .' - '. $conf->get('general.title');
1672     }
1673
1674     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
1675
1676     foreach ($data as $key => $value) {
1677         $PAGE->assign($key, $value);
1678     }
1679
1680     return;
1681 }
1682
1683 /**
1684  * Compute the thumbnail for a link.
1685  *
1686  * With a link to the original URL.
1687  * Understands various services (youtube.com...)
1688  * Input: $url = URL for which the thumbnail must be found.
1689  *        $href = if provided, this URL will be followed instead of $url
1690  * Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1691  * Some of them may be missing.
1692  * Return an empty array if no thumbnail available.
1693  *
1694  * @param ConfigManager $conf Configuration Manager instance.
1695  * @param string        $url
1696  * @param string|bool   $href
1697  *
1698  * @return array
1699  */
1700 function computeThumbnail($conf, $url, $href = false)
1701 {
1702     if (!$conf->get('thumbnail.enable_thumbnails')) return array();
1703     if ($href==false) $href=$url;
1704
1705     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1706     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1707     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1708     $domain = parse_url($url,PHP_URL_HOST);
1709     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1710     {
1711         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1712         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1713                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1714     }
1715     if ($domain=='youtu.be') // Youtube short links
1716     {
1717         $path = parse_url($url,PHP_URL_PATH);
1718         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1719                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1720     }
1721     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1722     {
1723         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1724         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1725                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1726     }
1727
1728     if ($domain=='imgur.com')
1729     {
1730         $path = parse_url($url,PHP_URL_PATH);
1731         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1732         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1733                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1734         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1735                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1736
1737         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1738                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1739     }
1740     if ($domain=='i.imgur.com')
1741     {
1742         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1743         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1744                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1745     }
1746     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1747     {
1748         if (strpos($url,'dailymotion.com/video/')!==false)
1749         {
1750             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1751             return array('src'=>$thumburl,
1752                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1753         }
1754     }
1755     if (endsWith($domain,'.imageshack.us'))
1756     {
1757         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1758         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1759         {
1760             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1761             return array('src'=>$thumburl,
1762                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1763         }
1764     }
1765
1766     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1767     // So we deport the thumbnail generation in order not to slow down page generation
1768     // (and we also cache the thumbnail)
1769
1770     if (! $conf->get('thumbnail.enable_localcache')) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1771
1772     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1773         || $domain=='vimeo.com'
1774         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1775         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1776     )
1777     {
1778         if ($domain=='vimeo.com')
1779         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1780             $path = parse_url($url,PHP_URL_PATH);
1781             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1782         }
1783         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
1784         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
1785             $path = parse_url($url,PHP_URL_PATH);
1786             if (!preg_match('!/\d+.+?!',$path)) return array();
1787         }
1788         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
1789         {   // Make sure this TED URL points to a video (/talks/...)
1790             $path = parse_url($url,PHP_URL_PATH);
1791             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
1792         }
1793         $sign = hash_hmac('sha256', $url, $conf->get('credentials.salt')); // We use the salt to sign data (it's random, secret, and specific to each installation)
1794         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1795                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1796     }
1797
1798     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1799     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1800     // But using the extension will do.
1801     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1802     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1803     {
1804         $sign = hash_hmac('sha256', $url, $conf->get('credentials.salt')); // We use the salt to sign data (it's random, secret, and specific to each installation)
1805         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1806                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1807     }
1808     return array(); // No thumbnail.
1809
1810 }
1811
1812
1813 // Returns the HTML code to display a thumbnail for a link
1814 // with a link to the original URL.
1815 // Understands various services (youtube.com...)
1816 // Input: $url = URL for which the thumbnail must be found.
1817 //        $href = if provided, this URL will be followed instead of $url
1818 // Returns '' if no thumbnail available.
1819 function thumbnail($url,$href=false)
1820 {
1821     // FIXME!
1822     global $conf;
1823     $t = computeThumbnail($conf, $url,$href);
1824     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1825
1826     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
1827     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1828     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1829     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1830     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1831     $html.='></a>';
1832     return $html;
1833 }
1834
1835 // Returns the HTML code to display a thumbnail for a link
1836 // for the picture wall (using lazy image loading)
1837 // Understands various services (youtube.com...)
1838 // Input: $url = URL for which the thumbnail must be found.
1839 //        $href = if provided, this URL will be followed instead of $url
1840 // Returns '' if no thumbnail available.
1841 function lazyThumbnail($conf, $url,$href=false)
1842 {
1843     // FIXME!
1844     global $conf;
1845     $t = computeThumbnail($conf, $url,$href);
1846     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1847
1848     $html='<a href="'.escape($t['href']).'">';
1849
1850     // Lazy image
1851     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
1852
1853     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1854     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1855     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1856     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1857     $html.='>';
1858
1859     // No-JavaScript fallback.
1860     $html.='<noscript><img src="'.escape($t['src']).'"';
1861     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1862     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1863     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1864     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1865     $html.='></noscript></a>';
1866
1867     return $html;
1868 }
1869
1870
1871 /**
1872  * Installation
1873  * This function should NEVER be called if the file data/config.php exists.
1874  *
1875  * @param ConfigManager $conf Configuration Manager instance.
1876  */
1877 function install($conf)
1878 {
1879     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
1880     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
1881
1882
1883     // This part makes sure sessions works correctly.
1884     // (Because on some hosts, session.save_path may not be set correctly,
1885     // or we may not have write access to it.)
1886     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
1887     {   // Step 2: Check if data in session is correct.
1888         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
1889         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
1890         echo 'It currently points to '.session_save_path().'<br>';
1891         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
1892         echo '<br><a href="?">Click to try again.</a></pre>';
1893         die;
1894     }
1895     if (!isset($_SESSION['session_tested']))
1896     {   // Step 1 : Try to store data in session and reload page.
1897         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
1898         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
1899     }
1900     if (isset($_GET['test_session']))
1901     {   // Step 3: Sessions are OK. Remove test parameter from URL.
1902         header('Location: '.index_url($_SERVER));
1903     }
1904
1905
1906     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
1907     {
1908         $tz = 'UTC';
1909         if (!empty($_POST['continent']) && !empty($_POST['city'])
1910             && isTimeZoneValid($_POST['continent'], $_POST['city'])
1911         ) {
1912             $tz = $_POST['continent'].'/'.$_POST['city'];
1913         }
1914         $conf->set('general.timezone', $tz);
1915         $login = $_POST['setlogin'];
1916         $conf->set('credentials.login', $login);
1917         $salt = sha1(uniqid('', true) .'_'. mt_rand());
1918         $conf->set('credentials.salt', $salt);
1919         $conf->set('credentials.hash', sha1($_POST['setpassword'] . $login . $salt));
1920         if (!empty($_POST['title'])) {
1921             $conf->set('general.title', escape($_POST['title']));
1922         } else {
1923             $conf->set('general.title', 'Shared links on '.escape(index_url($_SERVER)));
1924         }
1925         $conf->set('updates.check_updates', !empty($_POST['updateCheck']));
1926         try {
1927             // Everything is ok, let's create config file.
1928             $conf->write(isLoggedIn());
1929         }
1930         catch(Exception $e) {
1931             error_log(
1932                     'ERROR while writing config file after installation.' . PHP_EOL .
1933                     $e->getMessage()
1934                 );
1935
1936             // TODO: do not handle exceptions/errors in JS.
1937             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
1938             exit;
1939         }
1940         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
1941         exit;
1942     }
1943
1944     // Display config form:
1945     list($timezone_form, $timezone_js) = generateTimeZoneForm();
1946     $timezone_html = '';
1947     if ($timezone_form != '') {
1948         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
1949     }
1950
1951     $PAGE = new PageBuilder($conf);
1952     $PAGE->assign('timezone_html',$timezone_html);
1953     $PAGE->assign('timezone_js',$timezone_js);
1954     $PAGE->renderPage('install');
1955     exit;
1956 }
1957
1958 /**
1959  * Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
1960  * I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
1961  * The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
1962  * This function is called by passing the URL:
1963  * http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
1964  * [URL] is the URL of the link (e.g. a flickr page)
1965  * [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
1966  * The function below will fetch the image from the webservice and store it in the cache.
1967  *
1968  * @param ConfigManager $conf Configuration Manager instance,
1969  */
1970 function genThumbnail($conf)
1971 {
1972     // Make sure the parameters in the URL were generated by us.
1973     $sign = hash_hmac('sha256', $_GET['url'], $conf->get('credentials.salt'));
1974     if ($sign!=$_GET['hmac']) die('Naughty boy!');
1975
1976     $cacheDir = $conf->get('resource.thumbnails_cache', 'cache');
1977     // Let's see if we don't already have the image for this URL in the cache.
1978     $thumbname=hash('sha1',$_GET['url']).'.jpg';
1979     if (is_file($cacheDir .'/'. $thumbname))
1980     {   // We have the thumbnail, just serve it:
1981         header('Content-Type: image/jpeg');
1982         echo file_get_contents($cacheDir .'/'. $thumbname);
1983         return;
1984     }
1985     // We may also serve a blank image (if service did not respond)
1986     $blankname=hash('sha1',$_GET['url']).'.gif';
1987     if (is_file($cacheDir .'/'. $blankname))
1988     {
1989         header('Content-Type: image/gif');
1990         echo file_get_contents($cacheDir .'/'. $blankname);
1991         return;
1992     }
1993
1994     // Otherwise, generate the thumbnail.
1995     $url = $_GET['url'];
1996     $domain = parse_url($url,PHP_URL_HOST);
1997
1998     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
1999     {
2000         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2001         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2002
2003         // Is this a link to an image, or to a flickr page ?
2004         $imageurl='';
2005         if (endsWith(parse_url($url, PHP_URL_PATH), '.jpg'))
2006         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2007             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2008             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2009         }
2010         else // This is a flickr page (html)
2011         {
2012             // Get the flickr html page.
2013             list($headers, $content) = get_http_response($url, 20);
2014             if (strpos($headers[0], '200 OK') !== false)
2015             {
2016                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2017                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2018                 if (!empty($matches[1])) $imageurl=$matches[1];
2019
2020                 // In albums (and some other pages), the link rel="image_src" is not provided,
2021                 // but flickr provides:
2022                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2023                 if ($imageurl=='')
2024                 {
2025                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2026                     if (!empty($matches[1])) $imageurl=$matches[1];
2027                 }
2028             }
2029         }
2030
2031         if ($imageurl!='')
2032         {   // Let's download the image.
2033             // Image is 240x120, so 10 seconds to download should be enough.
2034             list($headers, $content) = get_http_response($imageurl, 10);
2035             if (strpos($headers[0], '200 OK') !== false) {
2036                 // Save image to cache.
2037                 file_put_contents($cacheDir .'/'. $thumbname, $content);
2038                 header('Content-Type: image/jpeg');
2039                 echo $content;
2040                 return;
2041             }
2042         }
2043     }
2044
2045     elseif ($domain=='vimeo.com' )
2046     {
2047         // This is more complex: we have to perform a HTTP request, then parse the result.
2048         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2049         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2050         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2051         if (strpos($headers[0], '200 OK') !== false) {
2052             $t = unserialize($content);
2053             $imageurl = $t[0]['thumbnail_medium'];
2054             // Then we download the image and serve it to our client.
2055             list($headers, $content) = get_http_response($imageurl, 10);
2056             if (strpos($headers[0], '200 OK') !== false) {
2057                 // Save image to cache.
2058                 file_put_contents($cacheDir .'/'. $thumbname, $content);
2059                 header('Content-Type: image/jpeg');
2060                 echo $content;
2061                 return;
2062             }
2063         }
2064     }
2065
2066     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2067     {
2068         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2069         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2070         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2071         list($headers, $content) = get_http_response($url, 5);
2072         if (strpos($headers[0], '200 OK') !== false) {
2073             // Extract the link to the thumbnail
2074             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2075             if (!empty($matches[1]))
2076             {   // Let's download the image.
2077                 $imageurl=$matches[1];
2078                 // No control on image size, so wait long enough
2079                 list($headers, $content) = get_http_response($imageurl, 20);
2080                 if (strpos($headers[0], '200 OK') !== false) {
2081                     $filepath = $cacheDir .'/'. $thumbname;
2082                     file_put_contents($filepath, $content); // Save image to cache.
2083                     if (resizeImage($filepath))
2084                     {
2085                         header('Content-Type: image/jpeg');
2086                         echo file_get_contents($filepath);
2087                         return;
2088                     }
2089                 }
2090             }
2091         }
2092     }
2093
2094     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2095     {
2096         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2097         // http://xkcd.com/327/
2098         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2099         list($headers, $content) = get_http_response($url, 5);
2100         if (strpos($headers[0], '200 OK') !== false) {
2101             // Extract the link to the thumbnail
2102             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2103             if (!empty($matches[1]))
2104             {   // Let's download the image.
2105                 $imageurl=$matches[1];
2106                 // No control on image size, so wait long enough
2107                 list($headers, $content) = get_http_response($imageurl, 20);
2108                 if (strpos($headers[0], '200 OK') !== false) {
2109                     $filepath = $cacheDir.'/'.$thumbname;
2110                     // Save image to cache.
2111                     file_put_contents($filepath, $content);
2112                     if (resizeImage($filepath))
2113                     {
2114                         header('Content-Type: image/jpeg');
2115                         echo file_get_contents($filepath);
2116                         return;
2117                     }
2118                 }
2119             }
2120         }
2121     }
2122
2123     else
2124     {
2125         // For all other domains, we try to download the image and make a thumbnail.
2126         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2127         list($headers, $content) = get_http_response($url, 30);
2128         if (strpos($headers[0], '200 OK') !== false) {
2129             $filepath = $cacheDir .'/'.$thumbname;
2130             // Save image to cache.
2131             file_put_contents($filepath, $content);
2132             if (resizeImage($filepath))
2133             {
2134                 header('Content-Type: image/jpeg');
2135                 echo file_get_contents($filepath);
2136                 return;
2137             }
2138         }
2139     }
2140
2141
2142     // Otherwise, return an empty image (8x8 transparent gif)
2143     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2144     // Also put something in cache so that this URL is not requested twice.
2145     file_put_contents($cacheDir .'/'. $blankname, $blankgif);
2146     header('Content-Type: image/gif');
2147     echo $blankgif;
2148 }
2149
2150 // Make a thumbnail of the image (to width: 120 pixels)
2151 // Returns true if success, false otherwise.
2152 function resizeImage($filepath)
2153 {
2154     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2155
2156     // Trick: some stupid people rename GIF as JPEG... or else.
2157     // So we really try to open each image type whatever the extension is.
2158     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2159     $im=false;
2160     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2161     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2162     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2163     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2164     $w = imagesx($im);
2165     $h = imagesy($im);
2166     $ystart = 0; $yheight=$h;
2167     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2168     $nw = 120;   // Desired width
2169     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2170     // Resize image:
2171     $im2 = imagecreatetruecolor($nw,$nh);
2172     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2173     imageinterlace($im2,true); // For progressive JPEG.
2174     $tempname=$filepath.'_TEMP.jpg';
2175     imagejpeg($im2, $tempname, 90);
2176     imagedestroy($im);
2177     imagedestroy($im2);
2178     unlink($filepath);
2179     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2180     return true;
2181 }
2182
2183 if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=genthumbnail')) { genThumbnail($conf); exit; }  // Thumbnail generation/cache does not need the link database.
2184 if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=dailyrss')) { showDailyRSS($conf); exit; }
2185 if (!isset($_SESSION['LINKS_PER_PAGE'])) {
2186     $_SESSION['LINKS_PER_PAGE'] = $conf->get('general.links_per_page', 20);
2187 }
2188 renderPage($conf, $pluginManager);