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 // Shaarli library
  48 require_once 'application/ApplicationUtils.php';
  49 require_once 'application/Cache.php';
  50 require_once 'application/CachedPage.php';
  51 require_once 'application/config/ConfigManager.php';
  52 require_once 'application/config/ConfigPlugin.php';
  53 require_once 'application/FeedBuilder.php';
  54 require_once 'application/FileUtils.php';
  55 require_once 'application/HttpUtils.php';
  56 require_once 'application/LinkDB.php';
  57 require_once 'application/LinkFilter.php';
  58 require_once 'application/LinkUtils.php';
  59 require_once 'application/NetscapeBookmarkUtils.php';
  60 require_once 'application/PageBuilder.php';
  61 require_once 'application/TimeZone.php';
  62 require_once 'application/Url.php';
  63 require_once 'application/Utils.php';
  64 require_once 'application/PluginManager.php';
  65 require_once 'application/Router.php';
  66 require_once 'application/Updater.php';
  67 require_once 'inc/rain.tpl.class.php';
  68
  69 // Ensure the PHP version is supported
  70 try {
  71     ApplicationUtils::checkPHPVersion('5.3', PHP_VERSION);
  72 } catch(Exception $exc) {
  73     header('Content-Type: text/plain; charset=utf-8');
  74     echo $exc->getMessage();
  75     exit;
  76 }
  77
  78 // Force cookie path (but do not change lifetime)
  79 $cookie = session_get_cookie_params();
  80 $cookiedir = '';
  81 if (dirname($_SERVER['SCRIPT_NAME']) != '/') {
  82     $cookiedir = dirname($_SERVER["SCRIPT_NAME"]).'/';
  83 }
  84 // Set default cookie expiration and path.
  85 session_set_cookie_params($cookie['lifetime'], $cookiedir, $_SERVER['SERVER_NAME']);
  86 // Set session parameters on server side.
  87 // If the user does not access any page within this time, his/her session is considered expired.
  88 define('INACTIVITY_TIMEOUT', 3600); // in seconds.
  89 // Use cookies to store session.
  90 ini_set('session.use_cookies', 1);
  91 // Force cookies for session (phpsessionID forbidden in URL).
  92 ini_set('session.use_only_cookies', 1);
  93 // Prevent PHP form using sessionID in URL if cookies are disabled.
  94 ini_set('session.use_trans_sid', false);
  95
  96 session_name('shaarli');
  97 // Start session if needed (Some server auto-start sessions).
  98 if (session_id() == '') {
  99     session_start();
 100 }
 101
 102 // Regenerate session ID if invalid or not defined in cookie.
 103 if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
 104     session_regenerate_id(true);
 105     $_COOKIE['shaarli'] = session_id();
 106 }
 107
 108 $conf = new ConfigManager();
 109 $conf->setEmpty('general.timezone', date_default_timezone_get());
 110 $conf->setEmpty('general.title', 'Shared links on '. escape(index_url($_SERVER)));
 111 RainTPL::$tpl_dir = $conf->get('resource.raintpl_tpl'); // template directory
 112 RainTPL::$cache_dir = $conf->get('resource.raintpl_tmp'); // cache directory
 113
 114 $pluginManager = new PluginManager($conf);
 115 $pluginManager->load($conf->get('general.enabled_plugins'));
 116
 117 date_default_timezone_set($conf->get('general.timezone', 'UTC'));
 118
 119 ob_start();  // Output buffering for the page cache.
 120
 121 // In case stupid admin has left magic_quotes enabled in php.ini:
 122 if (get_magic_quotes_gpc())
 123 {
 124     function stripslashes_deep($value) { $value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value); return $value; }
 125     $_POST = array_map('stripslashes_deep', $_POST);
 126     $_GET = array_map('stripslashes_deep', $_GET);
 127     $_COOKIE = array_map('stripslashes_deep', $_COOKIE);
 128 }
 129
 130 // Prevent caching on client side or proxy: (yes, it's ugly)
 131 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
 132 header("Cache-Control: no-store, no-cache, must-revalidate");
 133 header("Cache-Control: post-check=0, pre-check=0", false);
 134 header("Pragma: no-cache");
 135
 136 if (! is_file($conf->getConfigFileExt())) {
 137     // Ensure Shaarli has proper access to its resources
 138     $errors = ApplicationUtils::checkResourcePermissions($conf);
 139
 140     if ($errors != array()) {
 141         $message = '<p>Insufficient permissions:</p><ul>';
 142
 143         foreach ($errors as $error) {
 144             $message .= '<li>'.$error.'</li>';
 145         }
 146         $message .= '</ul>';
 147
 148         header('Content-Type: text/html; charset=utf-8');
 149         echo $message;
 150         exit;
 151     }
 152
 153     // Display the installation form if no existing config is found
 154     install($conf);
 155 }
 156
 157 // a token depending of deployment salt, user password, and the current ip
 158 define('STAY_SIGNED_IN_TOKEN', sha1($conf->get('credentials.hash') . $_SERVER['REMOTE_ADDR'] . $conf->get('credentials.salt')));
 159
 160 // Sniff browser language and set date format accordingly.
 161 if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
 162     autoLocale($_SERVER['HTTP_ACCEPT_LANGUAGE']);
 163 }
 164 header('Content-Type: text/html; charset=utf-8'); // We use UTF-8 for proper international characters handling.
 165
 166 /**
 167  * Checking session state (i.e. is the user still logged in)
 168  *
 169  * @param ConfigManager $conf The configuration manager.
 170  *
 171  * @return bool: true if the user is logged in, false otherwise.
 172  */
 173 function setup_login_state($conf)
 174 {
 175         if ($conf->get('security.open_shaarli')) {
 176             return true;
 177         }
 178         $userIsLoggedIn = false; // By default, we do not consider the user as logged in;
 179         $loginFailure = false; // If set to true, every attempt to authenticate the user will fail. This indicates that an important condition isn't met.
 180         if (! $conf->exists('credentials.login')) {
 181             $userIsLoggedIn = false;  // Shaarli is not configured yet.
 182             $loginFailure = true;
 183         }
 184         if (isset($_COOKIE['shaarli_staySignedIn']) &&
 185             $_COOKIE['shaarli_staySignedIn']===STAY_SIGNED_IN_TOKEN &&
 186             !$loginFailure)
 187         {
 188             fillSessionInfo($conf);
 189             $userIsLoggedIn = true;
 190         }
 191         // If session does not exist on server side, or IP address has changed, or session has expired, logout.
 192         if (empty($_SESSION['uid'])
 193         || ($conf->get('security.session_protection_disabled') == false && $_SESSION['ip'] != allIPs())
 194         || time() >= $_SESSION['expires_on'])
 195         {
 196             logout();
 197             $userIsLoggedIn = false;
 198             $loginFailure = true;
 199         }
 200         if (!empty($_SESSION['longlastingsession'])) {
 201             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession']; // In case of "Stay signed in" checked.
 202         }
 203         else {
 204             $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT; // Standard session expiration date.
 205         }
 206         if (!$loginFailure) {
 207             $userIsLoggedIn = true;
 208         }
 209
 210         return $userIsLoggedIn;
 211 }
 212 $userIsLoggedIn = setup_login_state($conf);
 213
 214 /**
 215  * PubSubHubbub protocol support (if enabled)  [UNTESTED]
 216  * (Source: http://aldarone.fr/les-flux-rss-shaarli-et-pubsubhubbub/ )
 217  *
 218  * @param ConfigManager $conf Configuration Manager instance.
 219  */
 220 function pubsubhub($conf)
 221 {
 222     $pshUrl = $conf->get('config.PUBSUBHUB_URL');
 223     if (!empty($pshUrl))
 224     {
 225         include_once './publisher.php';
 226         $p = new Publisher($pshUrl);
 227         $topic_url = array (
 228             index_url($_SERVER).'?do=atom',
 229             index_url($_SERVER).'?do=rss'
 230         );
 231         $p->publish_update($topic_url);
 232     }
 233 }
 234
 235 // ------------------------------------------------------------------------------------------
 236 // Session management
 237
 238 // Returns the IP address of the client (Used to prevent session cookie hijacking.)
 239 function allIPs()
 240 {
 241     $ip = $_SERVER['REMOTE_ADDR'];
 242     // Then we use more HTTP headers to prevent session hijacking from users behind the same proxy.
 243     if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip=$ip.'_'.$_SERVER['HTTP_X_FORWARDED_FOR']; }
 244     if (isset($_SERVER['HTTP_CLIENT_IP'])) { $ip=$ip.'_'.$_SERVER['HTTP_CLIENT_IP']; }
 245     return $ip;
 246 }
 247
 248 /**
 249  * Load user session.
 250  *
 251  * @param ConfigManager $conf Configuration Manager instance.
 252  */
 253 function fillSessionInfo($conf)
 254 {
 255         $_SESSION['uid'] = sha1(uniqid('',true).'_'.mt_rand()); // Generate unique random number (different than phpsessionid)
 256         $_SESSION['ip']=allIPs();                // We store IP address(es) of the client to make sure session is not hijacked.
 257         $_SESSION['username']= $conf->get('credentials.login');
 258         $_SESSION['expires_on']=time()+INACTIVITY_TIMEOUT;  // Set session expiration.
 259 }
 260
 261 /**
 262  * Check that user/password is correct.
 263  *
 264  * @param string        $login    Username
 265  * @param string        $password User password
 266  * @param ConfigManager $conf     Configuration Manager instance.
 267  *
 268  * @return bool: authentication successful or not.
 269  */
 270 function check_auth($login, $password, $conf)
 271 {
 272     $hash = sha1($password . $login . $conf->get('credentials.salt'));
 273     if ($login == $conf->get('credentials.login') && $hash == $conf->get('credentials.hash'))
 274     {   // Login/password is correct.
 275                 fillSessionInfo($conf);
 276         logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Login successful');
 277         return true;
 278     }
 279     logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Login failed for user '.$login);
 280     return false;
 281 }
 282
 283 // Returns true if the user is logged in.
 284 function isLoggedIn()
 285 {
 286     global $userIsLoggedIn;
 287     return $userIsLoggedIn;
 288 }
 289
 290 // Force logout.
 291 function logout() {
 292     if (isset($_SESSION)) {
 293         unset($_SESSION['uid']);
 294         unset($_SESSION['ip']);
 295         unset($_SESSION['username']);
 296         unset($_SESSION['privateonly']);
 297     }
 298     setcookie('shaarli_staySignedIn', FALSE, 0, WEB_PATH);
 299 }
 300
 301
 302 // ------------------------------------------------------------------------------------------
 303 // Brute force protection system
 304 // Several consecutive failed logins will ban the IP address for 30 minutes.
 305 if (!is_file($conf->get('resource.ban_file', 'data/ipbans.php'))) {
 306     // FIXME! globals
 307     file_put_contents(
 308         $conf->get('resource.ban_file', 'data/ipbans.php'),
 309         "<?php\n\$GLOBALS['IPBANS']=".var_export(array('FAILURES'=>array(),'BANS'=>array()),true).";\n?>"
 310     );
 311 }
 312 include $conf->get('resource.ban_file', 'data/ipbans.php');
 313 /**
 314  * Signal a failed login. Will ban the IP if too many failures:
 315  *
 316  * @param ConfigManager $conf Configuration Manager instance.
 317  */
 318 function ban_loginFailed($conf)
 319 {
 320     $ip = $_SERVER['REMOTE_ADDR'];
 321     $gb = $GLOBALS['IPBANS'];
 322     if (!isset($gb['FAILURES'][$ip])) $gb['FAILURES'][$ip]=0;
 323     $gb['FAILURES'][$ip]++;
 324     if ($gb['FAILURES'][$ip] > ($conf->get('security.ban_after') - 1))
 325     {
 326         $gb['BANS'][$ip] = time() + $conf->get('security.ban_after', 1800);
 327         logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'IP address banned from login');
 328     }
 329     $GLOBALS['IPBANS'] = $gb;
 330     file_put_contents(
 331         $conf->get('resource.ban_file', 'data/ipbans.php'),
 332         "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 333     );
 334 }
 335
 336 /**
 337  * Signals a successful login. Resets failed login counter.
 338  *
 339  * @param ConfigManager $conf Configuration Manager instance.
 340  */
 341 function ban_loginOk($conf)
 342 {
 343     $ip = $_SERVER['REMOTE_ADDR'];
 344     $gb = $GLOBALS['IPBANS'];
 345     unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 346     $GLOBALS['IPBANS'] = $gb;
 347     file_put_contents(
 348         $conf->get('resource.ban_file', 'data/ipbans.php'),
 349         "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 350     );
 351 }
 352
 353 /**
 354  * Checks if the user CAN login. If 'true', the user can try to login.
 355  *
 356  * @param ConfigManager $conf Configuration Manager instance.
 357  *
 358  * @return bool: true if the user is allowed to login.
 359  */
 360 function ban_canLogin($conf)
 361 {
 362     $ip=$_SERVER["REMOTE_ADDR"]; $gb=$GLOBALS['IPBANS'];
 363     if (isset($gb['BANS'][$ip]))
 364     {
 365         // User is banned. Check if the ban has expired:
 366         if ($gb['BANS'][$ip]<=time())
 367         {   // Ban expired, user can try to login again.
 368             logm($conf->get('resource.log'), $_SERVER['REMOTE_ADDR'], 'Ban lifted.');
 369             unset($gb['FAILURES'][$ip]); unset($gb['BANS'][$ip]);
 370             file_put_contents(
 371                 $conf->get('resource.ban_file', 'data/ipbans.php'),
 372                 "<?php\n\$GLOBALS['IPBANS']=".var_export($gb,true).";\n?>"
 373             );
 374             return true; // Ban has expired, user can login.
 375         }
 376         return false; // User is banned.
 377     }
 378     return true; // User is not banned.
 379 }
 380
 381 // ------------------------------------------------------------------------------------------
 382 // Process login form: Check if login/password is correct.
 383 if (isset($_POST['login']))
 384 {
 385     if (!ban_canLogin($conf)) die('I said: NO. You are banned for the moment. Go away.');
 386     if (isset($_POST['password'])
 387         && tokenOk($_POST['token'])
 388         && (check_auth($_POST['login'], $_POST['password'], $conf))
 389     ) {   // Login/password is OK.
 390         ban_loginOk($conf);
 391         // If user wants to keep the session cookie even after the browser closes:
 392         if (!empty($_POST['longlastingsession']))
 393         {
 394                         setcookie('shaarli_staySignedIn', STAY_SIGNED_IN_TOKEN, time()+31536000, WEB_PATH);
 395             $_SESSION['longlastingsession']=31536000;  // (31536000 seconds = 1 year)
 396             $_SESSION['expires_on']=time()+$_SESSION['longlastingsession'];  // Set session expiration on server-side.
 397
 398             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 399             session_set_cookie_params($_SESSION['longlastingsession'],$cookiedir,$_SERVER['SERVER_NAME']); // Set session cookie expiration on client side
 400             // Note: Never forget the trailing slash on the cookie path!
 401             session_regenerate_id(true);  // Send cookie with new expiration date to browser.
 402         }
 403         else // Standard session expiration (=when browser closes)
 404         {
 405             $cookiedir = ''; if(dirname($_SERVER['SCRIPT_NAME'])!='/') $cookiedir=dirname($_SERVER["SCRIPT_NAME"]).'/';
 406             session_set_cookie_params(0,$cookiedir,$_SERVER['SERVER_NAME']); // 0 means "When browser closes"
 407             session_regenerate_id(true);
 408         }
 409
 410         // Optional redirect after login:
 411         if (isset($_GET['post'])) {
 412             $uri = '?post='. urlencode($_GET['post']);
 413             foreach (array('description', 'source', 'title') as $param) {
 414                 if (!empty($_GET[$param])) {
 415                     $uri .= '&'.$param.'='.urlencode($_GET[$param]);
 416                 }
 417             }
 418             header('Location: '. $uri);
 419             exit;
 420         }
 421
 422         if (isset($_GET['edit_link'])) {
 423             header('Location: ?edit_link='. escape($_GET['edit_link']));
 424             exit;
 425         }
 426
 427         if (isset($_POST['returnurl'])) {
 428             // Prevent loops over login screen.
 429             if (strpos($_POST['returnurl'], 'do=login') === false) {
 430                 header('Location: '. generateLocation($_POST['returnurl'], $_SERVER['HTTP_HOST']));
 431                 exit;
 432             }
 433         }
 434         header('Location: ?'); exit;
 435     }
 436     else
 437     {
 438         ban_loginFailed($conf);
 439         $redir = '&username='. $_POST['login'];
 440         if (isset($_GET['post'])) {
 441             $redir .= '&post=' . urlencode($_GET['post']);
 442             foreach (array('description', 'source', 'title') as $param) {
 443                 if (!empty($_GET[$param])) {
 444                     $redir .= '&' . $param . '=' . urlencode($_GET[$param]);
 445                 }
 446             }
 447         }
 448         echo '<script>alert("Wrong login/password.");document.location=\'?do=login'.$redir.'\';</script>'; // Redirect to login screen.
 449         exit;
 450     }
 451 }
 452
 453 // ------------------------------------------------------------------------------------------
 454 // Misc utility functions:
 455
 456 // Convert post_max_size/upload_max_filesize (e.g. '16M') parameters to bytes.
 457 function return_bytes($val)
 458 {
 459     $val = trim($val); $last=strtolower($val[strlen($val)-1]);
 460     switch($last)
 461     {
 462         case 'g': $val *= 1024;
 463         case 'm': $val *= 1024;
 464         case 'k': $val *= 1024;
 465     }
 466     return $val;
 467 }
 468
 469 // Try to determine max file size for uploads (POST).
 470 // Returns an integer (in bytes)
 471 function getMaxFileSize()
 472 {
 473     $size1 = return_bytes(ini_get('post_max_size'));
 474     $size2 = return_bytes(ini_get('upload_max_filesize'));
 475     // Return the smaller of two:
 476     $maxsize = min($size1,$size2);
 477     // FIXME: Then convert back to readable notations ? (e.g. 2M instead of 2000000)
 478     return $maxsize;
 479 }
 480
 481 // ------------------------------------------------------------------------------------------
 482 // Token management for XSRF protection
 483 // Token should be used in any form which acts on data (create,update,delete,import...).
 484 if (!isset($_SESSION['tokens'])) $_SESSION['tokens']=array();  // Token are attached to the session.
 485
 486 /**
 487  * Returns a token.
 488  *
 489  * @param ConfigManager $conf Configuration Manager instance.
 490  *
 491  * @return string token.
 492  */
 493 function getToken($conf)
 494 {
 495     $rnd = sha1(uniqid('', true) .'_'. mt_rand() . $conf->get('credentials.salt'));  // We generate a random string.
 496     $_SESSION['tokens'][$rnd]=1;  // Store it on the server side.
 497     return $rnd;
 498 }
 499
 500 // Tells if a token is OK. Using this function will destroy the token.
 501 // true=token is OK.
 502 function tokenOk($token)
 503 {
 504     if (isset($_SESSION['tokens'][$token]))
 505     {
 506         unset($_SESSION['tokens'][$token]); // Token is used: destroy it.
 507         return true; // Token is OK.
 508     }
 509     return false; // Wrong token, or already used.
 510 }
 511
 512 /**
 513  * Daily RSS feed: 1 RSS entry per day giving all the links on that day.
 514  * Gives the last 7 days (which have links).
 515  * This RSS feed cannot be filtered.
 516  *
 517  * @param ConfigManager $conf Configuration Manager instance.
 518  */
 519 function showDailyRSS($conf) {
 520     // Cache system
 521     $query = $_SERVER['QUERY_STRING'];
 522     $cache = new CachedPage(
 523         $conf->get('config.PAGE_CACHE'),
 524         page_url($_SERVER),
 525         startsWith($query,'do=dailyrss') && !isLoggedIn()
 526     );
 527     $cached = $cache->cachedVersion();
 528     if (!empty($cached)) {
 529         echo $cached;
 530         exit;
 531     }
 532
 533     // If cached was not found (or not usable), then read the database and build the response:
 534     // Read links from database (and filter private links if used it not logged in).
 535     $LINKSDB = new LinkDB(
 536         $conf->get('resource.datastore'),
 537         isLoggedIn(),
 538         $conf->get('privacy.hide_public_links'),
 539         $conf->get('redirector.url'),
 540         $conf->get('redirector.encode_url')
 541     );
 542
 543     /* Some Shaarlies may have very few links, so we need to look
 544        back in time (rsort()) until we have enough days ($nb_of_days).
 545     */
 546     $linkdates = array();
 547     foreach ($LINKSDB as $linkdate => $value) {
 548         $linkdates[] = $linkdate;
 549     }
 550     rsort($linkdates);
 551     $nb_of_days = 7; // We take 7 days.
 552     $today = date('Ymd');
 553     $days = array();
 554
 555     foreach ($linkdates as $linkdate) {
 556         $day = substr($linkdate, 0, 8); // Extract day (without time)
 557         if (strcmp($day,$today) < 0) {
 558             if (empty($days[$day])) {
 559                 $days[$day] = array();
 560             }
 561             $days[$day][] = $linkdate;
 562         }
 563
 564         if (count($days) > $nb_of_days) {
 565             break; // Have we collected enough days?
 566         }
 567     }
 568
 569     // Build the RSS feed.
 570     header('Content-Type: application/rss+xml; charset=utf-8');
 571     $pageaddr = escape(index_url($_SERVER));
 572     echo '<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">';
 573     echo '<channel>';
 574     echo '<title>Daily - '. $conf->get('general.title') . '</title>';
 575     echo '<link>'. $pageaddr .'</link>';
 576     echo '<description>Daily shared links</description>';
 577     echo '<language>en-en</language>';
 578     echo '<copyright>'. $pageaddr .'</copyright>'. PHP_EOL;
 579
 580     // For each day.
 581     foreach ($days as $day => $linkdates) {
 582         $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 583         $absurl = escape(index_url($_SERVER).'?do=daily&day='.$day);  // Absolute URL of the corresponding "Daily" page.
 584
 585         // Build the HTML body of this RSS entry.
 586         $html = '';
 587         $href = '';
 588         $links = array();
 589
 590         // We pre-format some fields for proper output.
 591         foreach ($linkdates as $linkdate) {
 592             $l = $LINKSDB[$linkdate];
 593             $l['formatedDescription'] = format_description($l['description'], $conf->get('redirector.url'));
 594             $l['thumbnail'] = thumbnail($conf, $l['url']);
 595             $l_date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $l['linkdate']);
 596             $l['timestamp'] = $l_date->getTimestamp();
 597             if (startsWith($l['url'], '?')) {
 598                 $l['url'] = index_url($_SERVER) . $l['url'];  // make permalink URL absolute
 599             }
 600             $links[$linkdate] = $l;
 601         }
 602
 603         // Then build the HTML for this day:
 604         $tpl = new RainTPL;
 605         $tpl->assign('title', $conf->get('general.title'));
 606         $tpl->assign('daydate', $dayDate->getTimestamp());
 607         $tpl->assign('absurl', $absurl);
 608         $tpl->assign('links', $links);
 609         $tpl->assign('rssdate', escape($dayDate->format(DateTime::RSS)));
 610         $tpl->assign('hide_timestamps', $conf->get('privacy.hide_timestamps', false));
 611         $html = $tpl->draw('dailyrss', $return_string=true);
 612
 613         echo $html . PHP_EOL;
 614     }
 615     echo '</channel></rss><!-- Cached version of '. escape(page_url($_SERVER)) .' -->';
 616
 617     $cache->cache(ob_get_contents());
 618     ob_end_flush();
 619     exit;
 620 }
 621
 622 /**
 623  * Show the 'Daily' page.
 624  *
 625  * @param PageBuilder   $pageBuilder   Template engine wrapper.
 626  * @param LinkDB        $LINKSDB       LinkDB instance.
 627  * @param ConfigManager $conf          Configuration Manager instance.
 628  * @param PluginManager $pluginManager Plugin Manager instane.
 629  */
 630 function showDaily($pageBuilder, $LINKSDB, $conf, $pluginManager)
 631 {
 632     $day=date('Ymd',strtotime('-1 day')); // Yesterday, in format YYYYMMDD.
 633     if (isset($_GET['day'])) $day=$_GET['day'];
 634
 635     $days = $LINKSDB->days();
 636     $i = array_search($day,$days);
 637     if ($i===false) { $i=count($days)-1; $day=$days[$i]; }
 638     $previousday='';
 639     $nextday='';
 640     if ($i!==false)
 641     {
 642         if ($i>=1) $previousday=$days[$i-1];
 643         if ($i<count($days)-1) $nextday=$days[$i+1];
 644     }
 645
 646     try {
 647         $linksToDisplay = $LINKSDB->filterDay($day);
 648     } catch (Exception $exc) {
 649         error_log($exc);
 650         $linksToDisplay = array();
 651     }
 652
 653     // We pre-format some fields for proper output.
 654     foreach($linksToDisplay as $key=>$link)
 655     {
 656
 657         $taglist = explode(' ',$link['tags']);
 658         uasort($taglist, 'strcasecmp');
 659         $linksToDisplay[$key]['taglist']=$taglist;
 660         $linksToDisplay[$key]['formatedDescription'] = format_description($link['description'], $conf->get('redirector.url'));
 661         $linksToDisplay[$key]['thumbnail'] = thumbnail($conf, $link['url']);
 662         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
 663         $linksToDisplay[$key]['timestamp'] = $date->getTimestamp();
 664     }
 665
 666     /* We need to spread the articles on 3 columns.
 667        I did not want to use a JavaScript lib like http://masonry.desandro.com/
 668        so I manually spread entries with a simple method: I roughly evaluate the
 669        height of a div according to title and description length.
 670     */
 671     $columns=array(array(),array(),array()); // Entries to display, for each column.
 672     $fill=array(0,0,0);  // Rough estimate of columns fill.
 673     foreach($linksToDisplay as $key=>$link)
 674     {
 675         // Roughly estimate length of entry (by counting characters)
 676         // Title: 30 chars = 1 line. 1 line is 30 pixels height.
 677         // Description: 836 characters gives roughly 342 pixel height.
 678         // This is not perfect, but it's usually OK.
 679         $length=strlen($link['title'])+(342*strlen($link['description']))/836;
 680         if ($link['thumbnail']) $length +=100; // 1 thumbnails roughly takes 100 pixels height.
 681         // Then put in column which is the less filled:
 682         $smallest=min($fill); // find smallest value in array.
 683         $index=array_search($smallest,$fill); // find index of this smallest value.
 684         array_push($columns[$index],$link); // Put entry in this column.
 685         $fill[$index]+=$length;
 686     }
 687
 688     $dayDate = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $day.'_000000');
 689     $data = array(
 690         'linksToDisplay' => $linksToDisplay,
 691         'cols' => $columns,
 692         'day' => $dayDate->getTimestamp(),
 693         'previousday' => $previousday,
 694         'nextday' => $nextday,
 695     );
 696
 697     $pluginManager->executeHooks('render_daily', $data, array('loggedin' => isLoggedIn()));
 698
 699     foreach ($data as $key => $value) {
 700         $pageBuilder->assign($key, $value);
 701     }
 702
 703     $pageBuilder->renderPage('daily');
 704     exit;
 705 }
 706
 707 /**
 708  * Renders the linklist
 709  *
 710  * @param pageBuilder   $PAGE    pageBuilder instance.
 711  * @param LinkDB        $LINKSDB LinkDB instance.
 712  * @param ConfigManager $conf    Configuration Manager instance.
 713  * @param PluginManager $pluginManager Plugin Manager instance.
 714  */
 715 function showLinkList($PAGE, $LINKSDB, $conf, $pluginManager) {
 716     buildLinkList($PAGE,$LINKSDB, $conf, $pluginManager); // Compute list of links to display
 717     $PAGE->renderPage('linklist');
 718 }
 719
 720 /**
 721  * Render HTML page (according to URL parameters and user rights)
 722  *
 723  * @param ConfigManager $conf          Configuration Manager instance.
 724  * @param PluginManager $pluginManager Plugin Manager instance,
 725  */
 726 function renderPage($conf, $pluginManager)
 727 {
 728     $LINKSDB = new LinkDB(
 729         $conf->get('resource.datastore'),
 730         isLoggedIn(),
 731         $conf->get('privacy.hide_public_links'),
 732         $conf->get('redirector.url'),
 733         $conf->get('redirector.encode_url')
 734     );
 735
 736     $updater = new Updater(
 737         read_updates_file($conf->get('resource.updates')),
 738         $LINKSDB,
 739         $conf,
 740         isLoggedIn()
 741     );
 742     try {
 743         $newUpdates = $updater->update();
 744         if (! empty($newUpdates)) {
 745             write_updates_file(
 746                 $conf->get('resource.updates'),
 747                 $updater->getDoneUpdates()
 748             );
 749         }
 750     }
 751     catch(Exception $e) {
 752         die($e->getMessage());
 753     }
 754
 755     $PAGE = new PageBuilder($conf);
 756     $PAGE->assign('linkcount', count($LINKSDB));
 757     $PAGE->assign('privateLinkcount', count_private($LINKSDB));
 758
 759     // Determine which page will be rendered.
 760     $query = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : '';
 761     $targetPage = Router::findPage($query, $_GET, isLoggedIn());
 762
 763     // Call plugin hooks for header, footer and includes, specifying which page will be rendered.
 764     // Then assign generated data to RainTPL.
 765     $common_hooks = array(
 766         'includes',
 767         'header',
 768         'footer',
 769     );
 770
 771     foreach($common_hooks as $name) {
 772         $plugin_data = array();
 773         $pluginManager->executeHooks('render_' . $name, $plugin_data,
 774             array(
 775                 'target' => $targetPage,
 776                 'loggedin' => isLoggedIn()
 777             )
 778         );
 779         $PAGE->assign('plugins_' . $name, $plugin_data);
 780     }
 781
 782     // -------- Display login form.
 783     if ($targetPage == Router::$PAGE_LOGIN)
 784     {
 785         if ($conf->get('security.open_shaarli')) { header('Location: ?'); exit; }  // No need to login for open Shaarli
 786         $token=''; if (ban_canLogin($conf)) $token=getToken($conf); // Do not waste token generation if not useful.
 787         $PAGE->assign('token',$token);
 788         if (isset($_GET['username'])) {
 789             $PAGE->assign('username', escape($_GET['username']));
 790         }
 791         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
 792         $PAGE->renderPage('loginform');
 793         exit;
 794     }
 795     // -------- User wants to logout.
 796     if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=logout'))
 797     {
 798         invalidateCaches($conf->get('resource.page_cache'));
 799         logout();
 800         header('Location: ?');
 801         exit;
 802     }
 803
 804     // -------- Picture wall
 805     if ($targetPage == Router::$PAGE_PICWALL)
 806     {
 807         // Optionally filter the results:
 808         $links = $LINKSDB->filterSearch($_GET);
 809         $linksToDisplay = array();
 810
 811         // Get only links which have a thumbnail.
 812         foreach($links as $link)
 813         {
 814             $permalink='?'.escape(smallhash($link['linkdate']));
 815             $thumb=lazyThumbnail($conf, $link['url'],$permalink);
 816             if ($thumb!='') // Only output links which have a thumbnail.
 817             {
 818                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
 819                 $linksToDisplay[]=$link; // Add to array.
 820             }
 821         }
 822
 823         $data = array(
 824             'linksToDisplay' => $linksToDisplay,
 825         );
 826         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
 827
 828         foreach ($data as $key => $value) {
 829             $PAGE->assign($key, $value);
 830         }
 831
 832         $PAGE->renderPage('picwall');
 833         exit;
 834     }
 835
 836     // -------- Tag cloud
 837     if ($targetPage == Router::$PAGE_TAGCLOUD)
 838     {
 839         $tags= $LINKSDB->allTags();
 840
 841         // We sort tags alphabetically, then choose a font size according to count.
 842         // First, find max value.
 843         $maxcount = 0;
 844         foreach ($tags as $value) {
 845             $maxcount = max($maxcount, $value);
 846         }
 847
 848         // Sort tags alphabetically: case insensitive, support locale if avalaible.
 849         uksort($tags, function($a, $b) {
 850             // Collator is part of PHP intl.
 851             if (class_exists('Collator')) {
 852                 $c = new Collator(setlocale(LC_COLLATE, 0));
 853                 if (!intl_is_failure(intl_get_error_code())) {
 854                     return $c->compare($a, $b);
 855                 }
 856             }
 857             return strcasecmp($a, $b);
 858         });
 859
 860         $tagList = array();
 861         foreach($tags as $key => $value) {
 862             // Tag font size scaling:
 863             //   default 15 and 30 logarithm bases affect scaling,
 864             //   22 and 6 are arbitrary font sizes for max and min sizes.
 865             $size = log($value, 15) / log($maxcount, 30) * 2.2 + 0.8;
 866             $tagList[$key] = array(
 867                 'count' => $value,
 868                 'size' => number_format($size, 2, '.', ''),
 869             );
 870         }
 871
 872         $data = array(
 873             'tags' => $tagList,
 874         );
 875         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
 876
 877         foreach ($data as $key => $value) {
 878             $PAGE->assign($key, $value);
 879         }
 880
 881         $PAGE->renderPage('tagcloud');
 882         exit;
 883     }
 884
 885     // Daily page.
 886     if ($targetPage == Router::$PAGE_DAILY) {
 887         showDaily($PAGE, $LINKSDB, $conf, $pluginManager);
 888     }
 889
 890     // ATOM and RSS feed.
 891     if ($targetPage == Router::$PAGE_FEED_ATOM || $targetPage == Router::$PAGE_FEED_RSS) {
 892         $feedType = $targetPage == Router::$PAGE_FEED_RSS ? FeedBuilder::$FEED_RSS : FeedBuilder::$FEED_ATOM;
 893         header('Content-Type: application/'. $feedType .'+xml; charset=utf-8');
 894
 895         // Cache system
 896         $query = $_SERVER['QUERY_STRING'];
 897         $cache = new CachedPage(
 898             $conf->get('resource.page_cache'),
 899             page_url($_SERVER),
 900             startsWith($query,'do='. $targetPage) && !isLoggedIn()
 901         );
 902         $cached = $cache->cachedVersion();
 903         if (!empty($cached)) {
 904             echo $cached;
 905             exit;
 906         }
 907
 908         // Generate data.
 909         $feedGenerator = new FeedBuilder($LINKSDB, $feedType, $_SERVER, $_GET, isLoggedIn());
 910         $feedGenerator->setLocale(strtolower(setlocale(LC_COLLATE, 0)));
 911         $feedGenerator->setHideDates($conf->get('privacy.hide_timestamps') && !isLoggedIn());
 912         $feedGenerator->setUsePermalinks(isset($_GET['permalinks']) || !$conf->get('feed.rss_permalinks'));
 913         $pshUrl = $conf->get('config.PUBSUBHUB_URL');
 914         if (!empty($pshUrl)) {
 915             $feedGenerator->setPubsubhubUrl($pshUrl);
 916         }
 917         $data = $feedGenerator->buildData();
 918
 919         // Process plugin hook.
 920         $pluginManager->executeHooks('render_feed', $data, array(
 921             'loggedin' => isLoggedIn(),
 922             'target' => $targetPage,
 923         ));
 924
 925         // Render the template.
 926         $PAGE->assignAll($data);
 927         $PAGE->renderPage('feed.'. $feedType);
 928         $cache->cache(ob_get_contents());
 929         ob_end_flush();
 930         exit;
 931     }
 932
 933     // Display openseach plugin (XML)
 934     if ($targetPage == Router::$PAGE_OPENSEARCH) {
 935         header('Content-Type: application/xml; charset=utf-8');
 936         $PAGE->assign('serverurl', index_url($_SERVER));
 937         $PAGE->renderPage('opensearch');
 938         exit;
 939     }
 940
 941     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
 942     if (isset($_GET['addtag']))
 943     {
 944         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
 945         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
 946         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
 947
 948         // Prevent redirection loop
 949         if (isset($params['addtag'])) {
 950             unset($params['addtag']);
 951         }
 952
 953         // Check if this tag is already in the search query and ignore it if it is.
 954         // Each tag is always separated by a space
 955         if (isset($params['searchtags'])) {
 956             $current_tags = explode(' ', $params['searchtags']);
 957         } else {
 958             $current_tags = array();
 959         }
 960         $addtag = true;
 961         foreach ($current_tags as $value) {
 962             if ($value === $_GET['addtag']) {
 963                 $addtag = false;
 964                 break;
 965             }
 966         }
 967         // Append the tag if necessary
 968         if (empty($params['searchtags'])) {
 969             $params['searchtags'] = trim($_GET['addtag']);
 970         }
 971         else if ($addtag) {
 972             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
 973         }
 974
 975         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
 976         header('Location: ?'.http_build_query($params));
 977         exit;
 978     }
 979
 980     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
 981     if (isset($_GET['removetag'])) {
 982         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
 983         if (empty($_SERVER['HTTP_REFERER'])) {
 984             header('Location: ?');
 985             exit;
 986         }
 987
 988         // In case browser does not send HTTP_REFERER
 989         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
 990
 991         // Prevent redirection loop
 992         if (isset($params['removetag'])) {
 993             unset($params['removetag']);
 994         }
 995
 996         if (isset($params['searchtags'])) {
 997             $tags = explode(' ', $params['searchtags']);
 998             // Remove value from array $tags.
 999             $tags = array_diff($tags, array($_GET['removetag']));
1000             $params['searchtags'] = implode(' ',$tags);
1001
1002             if (empty($params['searchtags'])) {
1003                 unset($params['searchtags']);
1004             }
1005
1006             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1007         }
1008         header('Location: ?'.http_build_query($params));
1009         exit;
1010     }
1011
1012     // -------- User wants to change the number of links per page (linksperpage=...)
1013     if (isset($_GET['linksperpage'])) {
1014         if (is_numeric($_GET['linksperpage'])) {
1015             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1016         }
1017
1018         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1019         exit;
1020     }
1021
1022     // -------- User wants to see only private links (toggle)
1023     if (isset($_GET['privateonly'])) {
1024         if (empty($_SESSION['privateonly'])) {
1025             $_SESSION['privateonly'] = 1; // See only private links
1026         } else {
1027             unset($_SESSION['privateonly']); // See all links
1028         }
1029
1030         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1031         exit;
1032     }
1033
1034     // -------- Handle other actions allowed for non-logged in users:
1035     if (!isLoggedIn())
1036     {
1037         // User tries to post new link but is not logged in:
1038         // Show login screen, then redirect to ?post=...
1039         if (isset($_GET['post']))
1040         {
1041             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1042             exit;
1043         }
1044
1045         showLinkList($PAGE, $LINKSDB, $conf, $pluginManager);
1046         if (isset($_GET['edit_link'])) {
1047             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1048             exit;
1049         }
1050
1051         exit; // Never remove this one! All operations below are reserved for logged in user.
1052     }
1053
1054     // -------- All other functions are reserved for the registered user:
1055
1056     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1057     if ($targetPage == Router::$PAGE_TOOLS)
1058     {
1059         $data = array(
1060             'pageabsaddr' => index_url($_SERVER),
1061         );
1062         $pluginManager->executeHooks('render_tools', $data);
1063
1064         foreach ($data as $key => $value) {
1065             $PAGE->assign($key, $value);
1066         }
1067
1068         $PAGE->renderPage('tools');
1069         exit;
1070     }
1071
1072     // -------- User wants to change his/her password.
1073     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1074     {
1075         if ($conf->get('security.open_shaarli')) {
1076             die('You are not supposed to change a password on an Open Shaarli.');
1077         }
1078
1079         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1080         {
1081             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1082
1083             // Make sure old password is correct.
1084             $oldhash = sha1($_POST['oldpassword'].$conf->get('credentials.login').$conf->get('credentials.salt'));
1085             if ($oldhash!= $conf->get('credentials.hash')) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1086             // Save new password
1087             // Salt renders rainbow-tables attacks useless.
1088             $conf->set('credentials.salt', sha1(uniqid('', true) .'_'. mt_rand()));
1089             $conf->set('credentials.hash', sha1($_POST['setpassword'] . $conf->get('credentials.login') . $conf->get('credentials.salt')));
1090             try {
1091                 $conf->write(isLoggedIn());
1092             }
1093             catch(Exception $e) {
1094                 error_log(
1095                     'ERROR while writing config file after changing password.' . PHP_EOL .
1096                     $e->getMessage()
1097                 );
1098
1099                 // TODO: do not handle exceptions/errors in JS.
1100                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1101                 exit;
1102             }
1103             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1104             exit;
1105         }
1106         else // show the change password form.
1107         {
1108             $PAGE->assign('token',getToken($conf));
1109             $PAGE->renderPage('changepassword');
1110             exit;
1111         }
1112     }
1113
1114     // -------- User wants to change configuration
1115     if ($targetPage == Router::$PAGE_CONFIGURE)
1116     {
1117         if (!empty($_POST['title']) )
1118         {
1119             if (!tokenOk($_POST['token'])) {
1120                 die('Wrong token.'); // Go away!
1121             }
1122             $tz = 'UTC';
1123             if (!empty($_POST['continent']) && !empty($_POST['city'])
1124                 && isTimeZoneValid($_POST['continent'], $_POST['city'])
1125             ) {
1126                 $tz = $_POST['continent'] . '/' . $_POST['city'];
1127             }
1128             $conf->set('general.timezone', $tz);
1129             $conf->set('general.title', escape($_POST['title']));
1130             $conf->set('general.header_link', escape($_POST['titleLink']));
1131             $conf->set('redirector.url', escape($_POST['redirector']));
1132             $conf->set('security.session_protection_disabled', !empty($_POST['disablesessionprotection']));
1133             $conf->set('privacy.default_private_links', !empty($_POST['privateLinkByDefault']));
1134             $conf->set('feed.rss_permalinks', !empty($_POST['enableRssPermalinks']));
1135             $conf->set('updates.check_updates', !empty($_POST['updateCheck']));
1136             $conf->set('privacy.hide_public_links', !empty($_POST['hidePublicLinks']));
1137             try {
1138                 $conf->write(isLoggedIn());
1139             }
1140             catch(Exception $e) {
1141                 error_log(
1142                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1143                     $e->getMessage()
1144                 );
1145
1146                 // TODO: do not handle exceptions/errors in JS.
1147                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=configure\';</script>';
1148                 exit;
1149             }
1150             echo '<script>alert("Configuration was saved.");document.location=\'?do=configure\';</script>';
1151             exit;
1152         }
1153         else // Show the configuration form.
1154         {
1155             $PAGE->assign('token',getToken($conf));
1156             $PAGE->assign('title', $conf->get('general.title'));
1157             $PAGE->assign('redirector', $conf->get('redirector.url'));
1158             list($timezone_form, $timezone_js) = generateTimeZoneForm($conf->get('general.timezone'));
1159             $PAGE->assign('timezone_form', $timezone_form);
1160             $PAGE->assign('timezone_js',$timezone_js);
1161             $PAGE->assign('private_links_default', $conf->get('privacy.default_private_links', false));
1162             $PAGE->assign('session_protection_disabled', $conf->get('security.session_protection_disabled', false));
1163             $PAGE->assign('enable_rss_permalinks', $conf->get('feed.rss_permalinks', false));
1164             $PAGE->assign('enable_update_check', $conf->get('updates.check_updates', true));
1165             $PAGE->assign('hide_public_links', $conf->get('privacy.hide_public_links', false));
1166             $PAGE->renderPage('configure');
1167             exit;
1168         }
1169     }
1170
1171     // -------- User wants to rename a tag or delete it
1172     if ($targetPage == Router::$PAGE_CHANGETAG)
1173     {
1174         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1175             $PAGE->assign('token', getToken($conf));
1176             $PAGE->assign('tags', $LINKSDB->allTags());
1177             $PAGE->renderPage('changetag');
1178             exit;
1179         }
1180
1181         if (!tokenOk($_POST['token'])) {
1182             die('Wrong token.');
1183         }
1184
1185         // Delete a tag:
1186         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1187             $needle = trim($_POST['fromtag']);
1188             // True for case-sensitive tag search.
1189             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1190             foreach($linksToAlter as $key=>$value)
1191             {
1192                 $tags = explode(' ',trim($value['tags']));
1193                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1194                 $value['tags']=trim(implode(' ',$tags));
1195                 $LINKSDB[$key]=$value;
1196             }
1197             $LINKSDB->savedb($conf->get('resource.page_cache'));
1198             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1199             exit;
1200         }
1201
1202         // Rename a tag:
1203         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1204             $needle = trim($_POST['fromtag']);
1205             // True for case-sensitive tag search.
1206             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1207             foreach($linksToAlter as $key=>$value)
1208             {
1209                 $tags = explode(' ',trim($value['tags']));
1210                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1211                 $value['tags']=trim(implode(' ',$tags));
1212                 $LINKSDB[$key]=$value;
1213             }
1214             $LINKSDB->savedb($conf->get('resource.page_cache')); // Save to disk.
1215             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1216             exit;
1217         }
1218     }
1219
1220     // -------- User wants to add a link without using the bookmarklet: Show form.
1221     if ($targetPage == Router::$PAGE_ADDLINK)
1222     {
1223         $PAGE->renderPage('addlink');
1224         exit;
1225     }
1226
1227     // -------- User clicked the "Save" button when editing a link: Save link to database.
1228     if (isset($_POST['save_edit']))
1229     {
1230         $linkdate = $_POST['lf_linkdate'];
1231         $updated = isset($LINKSDB[$linkdate]) ? strval(date('Ymd_His')) : false;
1232
1233         // Go away!
1234         if (! tokenOk($_POST['token'])) {
1235             die('Wrong token.');
1236         }
1237         // Remove multiple spaces.
1238         $tags = trim(preg_replace('/\s\s+/', ' ', $_POST['lf_tags']));
1239         // Remove first '-' char in tags.
1240         $tags = preg_replace('/(^| )\-/', '$1', $tags);
1241         // Remove duplicates.
1242         $tags = implode(' ', array_unique(explode(' ', $tags)));
1243
1244         $url = trim($_POST['lf_url']);
1245         if (! startsWith($url, 'http:') && ! startsWith($url, 'https:')
1246             && ! startsWith($url, 'ftp:') && ! startsWith($url, 'magnet:')
1247             && ! startsWith($url, '?') && ! startsWith($url, 'javascript:')
1248         ) {
1249             $url = 'http://' . $url;
1250         }
1251
1252         $link = array(
1253             'title' => trim($_POST['lf_title']),
1254             'url' => $url,
1255             'description' => $_POST['lf_description'],
1256             'private' => (isset($_POST['lf_private']) ? 1 : 0),
1257             'linkdate' => $linkdate,
1258             'updated' => $updated,
1259             'tags' => str_replace(',', ' ', $tags)
1260         );
1261         // If title is empty, use the URL as title.
1262         if ($link['title'] == '') {
1263             $link['title'] = $link['url'];
1264         }
1265
1266         $pluginManager->executeHooks('save_link', $link);
1267
1268         $LINKSDB[$linkdate] = $link;
1269         $LINKSDB->savedb($conf->get('resource.page_cache'));
1270         pubsubhub($conf);
1271
1272         // If we are called from the bookmarklet, we must close the popup:
1273         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1274             echo '<script>self.close();</script>';
1275             exit;
1276         }
1277
1278         $returnurl = !empty($_POST['returnurl']) ? $_POST['returnurl'] : '?';
1279         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1280         // Scroll to the link which has been edited.
1281         $location .= '#' . smallHash($_POST['lf_linkdate']);
1282         // After saving the link, redirect to the page the user was on.
1283         header('Location: '. $location);
1284         exit;
1285     }
1286
1287     // -------- User clicked the "Cancel" button when editing a link.
1288     if (isset($_POST['cancel_edit']))
1289     {
1290         // If we are called from the bookmarklet, we must close the popup:
1291         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1292         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1293         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1294         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1295         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1296         exit;
1297     }
1298
1299     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1300     if (isset($_POST['delete_link']))
1301     {
1302         if (!tokenOk($_POST['token'])) die('Wrong token.');
1303         // We do not need to ask for confirmation:
1304         // - confirmation is handled by JavaScript
1305         // - we are protected from XSRF by the token.
1306         $linkdate=$_POST['lf_linkdate'];
1307
1308         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1309
1310         unset($LINKSDB[$linkdate]);
1311         $LINKSDB->savedb('resource.page_cache'); // save to disk
1312
1313         // If we are called from the bookmarklet, we must close the popup:
1314         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1315         // Pick where we're going to redirect
1316         // =============================================================
1317         // Basically, we can't redirect to where we were previously if it was a permalink
1318         // or an edit_link, because it would 404.
1319         // Cases:
1320         //    - /             : nothing in $_GET, redirect to self
1321         //    - /?page        : redirect to self
1322         //    - /?searchterm  : redirect to self (there might be other links)
1323         //    - /?searchtags  : redirect to self
1324         //    - /permalink    : redirect to / (the link does not exist anymore)
1325         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1326         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1327         // redirect is not satisfied, and only then redirect to /
1328         $location = "?";
1329         // Self redirection
1330         if (count($_GET) == 0
1331             || isset($_GET['page'])
1332             || isset($_GET['searchterm'])
1333             || isset($_GET['searchtags'])
1334         ) {
1335             if (isset($_POST['returnurl'])) {
1336                 $location = $_POST['returnurl']; // Handle redirects given by the form
1337             } else {
1338                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1339             }
1340         }
1341
1342         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1343         exit;
1344     }
1345
1346     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1347     if (isset($_GET['edit_link']))
1348     {
1349         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1350         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1351         $data = array(
1352             'link' => $link,
1353             'link_is_new' => false,
1354             'token' => getToken($conf),
1355             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1356             'tags' => $LINKSDB->allTags(),
1357         );
1358         $pluginManager->executeHooks('render_editlink', $data);
1359
1360         foreach ($data as $key => $value) {
1361             $PAGE->assign($key, $value);
1362         }
1363
1364         $PAGE->renderPage('editlink');
1365         exit;
1366     }
1367
1368     // -------- User want to post a new link: Display link edit form.
1369     if (isset($_GET['post'])) {
1370         $url = cleanup_url($_GET['post']);
1371
1372         $link_is_new = false;
1373         // Check if URL is not already in database (in this case, we will edit the existing link)
1374         $link = $LINKSDB->getLinkFromUrl($url);
1375         if (!$link)
1376         {
1377             $link_is_new = true;
1378             $linkdate = strval(date('Ymd_His'));
1379             // Get title if it was provided in URL (by the bookmarklet).
1380             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1381             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1382             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1383             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1384             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1385             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1386             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1387                 // Short timeout to keep the application responsive
1388                 list($headers, $content) = get_http_response($url, 4);
1389                 if (strpos($headers[0], '200 OK') !== false) {
1390                     // Retrieve charset.
1391                     $charset = get_charset($headers, $content);
1392                     // Extract title.
1393                     $title = html_extract_title($content);
1394                     // Re-encode title in utf-8 if necessary.
1395                     if (! empty($title) && strtolower($charset) != 'utf-8') {
1396                         $title = mb_convert_encoding($title, 'utf-8', $charset);
1397                     }
1398                 }
1399             }
1400
1401             if ($url == '') {
1402                 $url = '?' . smallHash($linkdate);
1403                 $title = 'Note: ';
1404             }
1405             $url = escape($url);
1406             $title = escape($title);
1407
1408             $link = array(
1409                 'linkdate' => $linkdate,
1410                 'title' => $title,
1411                 'url' => $url,
1412                 'description' => $description,
1413                 'tags' => $tags,
1414                 'private' => $private
1415             );
1416         }
1417
1418         $data = array(
1419             'link' => $link,
1420             'link_is_new' => $link_is_new,
1421             'token' => getToken($conf), // XSRF protection.
1422             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1423             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1424             'tags' => $LINKSDB->allTags(),
1425             'default_private_links' => $conf->get('default_private_links', false),
1426         );
1427         $pluginManager->executeHooks('render_editlink', $data);
1428
1429         foreach ($data as $key => $value) {
1430             $PAGE->assign($key, $value);
1431         }
1432
1433         $PAGE->renderPage('editlink');
1434         exit;
1435     }
1436
1437     if ($targetPage == Router::$PAGE_EXPORT) {
1438         // Export links as a Netscape Bookmarks file
1439
1440         if (empty($_GET['selection'])) {
1441             $PAGE->renderPage('export');
1442             exit;
1443         }
1444
1445         // export as bookmarks_(all|private|public)_YYYYmmdd_HHMMSS.html
1446         $selection = $_GET['selection'];
1447         if (isset($_GET['prepend_note_url'])) {
1448             $prependNoteUrl = $_GET['prepend_note_url'];
1449         } else {
1450             $prependNoteUrl = false;
1451         }
1452
1453         try {
1454             $PAGE->assign(
1455                 'links',
1456                 NetscapeBookmarkUtils::filterAndFormat(
1457                     $LINKSDB,
1458                     $selection,
1459                     $prependNoteUrl,
1460                     index_url($_SERVER)
1461                 )
1462             );
1463         } catch (Exception $exc) {
1464             header('Content-Type: text/plain; charset=utf-8');
1465             echo $exc->getMessage();
1466             exit;
1467         }
1468         $now = new DateTime();
1469         header('Content-Type: text/html; charset=utf-8');
1470         header(
1471             'Content-disposition: attachment; filename=bookmarks_'
1472            .$selection.'_'.$now->format(LinkDB::LINK_DATE_FORMAT).'.html'
1473         );
1474         $PAGE->assign('date', $now->format(DateTime::RFC822));
1475         $PAGE->assign('eol', PHP_EOL);
1476         $PAGE->assign('selection', $selection);
1477         $PAGE->renderPage('export.bookmarks');
1478         exit;
1479     }
1480
1481     // -------- User is uploading a file for import
1482     if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=upload'))
1483     {
1484         // If file is too big, some form field may be missing.
1485         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1486         {
1487             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1488             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1489             exit;
1490         }
1491         if (!tokenOk($_POST['token'])) die('Wrong token.');
1492         importFile($LINKSDB);
1493         exit;
1494     }
1495
1496     // -------- Show upload/import dialog:
1497     if ($targetPage == Router::$PAGE_IMPORT)
1498     {
1499         $PAGE->assign('token',getToken($conf));
1500         $PAGE->assign('maxfilesize',getMaxFileSize());
1501         $PAGE->renderPage('import');
1502         exit;
1503     }
1504
1505     // Plugin administration page
1506     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1507         $pluginMeta = $pluginManager->getPluginsMeta();
1508
1509         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1510         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1511         // Load parameters.
1512         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $conf->get('plugins', array()));
1513         uasort(
1514             $enabledPlugins,
1515             function($a, $b) { return $a['order'] - $b['order']; }
1516         );
1517         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1518
1519         $PAGE->assign('enabledPlugins', $enabledPlugins);
1520         $PAGE->assign('disabledPlugins', $disabledPlugins);
1521         $PAGE->renderPage('pluginsadmin');
1522         exit;
1523     }
1524
1525     // Plugin administration form action
1526     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1527         try {
1528             if (isset($_POST['parameters_form'])) {
1529                 unset($_POST['parameters_form']);
1530                 foreach ($_POST as $param => $value) {
1531                     $conf->set('plugins.'. $param, escape($value));
1532                 }
1533             }
1534             else {
1535                 $conf->set('general.enabled_plugins', save_plugin_config($_POST));
1536             }
1537             $conf->write(isLoggedIn());
1538         }
1539         catch (Exception $e) {
1540             error_log(
1541                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1542                 $e->getMessage()
1543             );
1544
1545             // TODO: do not handle exceptions/errors in JS.
1546             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do='. Router::$PAGE_PLUGINSADMIN .'\';</script>';
1547             exit;
1548         }
1549         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1550         exit;
1551     }
1552
1553     // -------- Otherwise, simply display search form and links:
1554     showLinkList($PAGE, $LINKSDB, $conf, $pluginManager);
1555     exit;
1556 }
1557
1558 /**
1559  * Process the import file form.
1560  *
1561  * @param LinkDB        $LINKSDB Loaded LinkDB instance.
1562  * @param ConfigManager $conf    Configuration Manager instance.
1563  */
1564 function importFile($LINKSDB, $conf)
1565 {
1566     if (!isLoggedIn()) { die('Not allowed.'); }
1567
1568     $filename=$_FILES['filetoupload']['name'];
1569     $filesize=$_FILES['filetoupload']['size'];
1570     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1571     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1572     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1573     $import_count=0;
1574
1575     // Sniff file type:
1576     $type='unknown';
1577     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1578
1579     // Then import the bookmarks.
1580     if ($type=='netscape')
1581     {
1582         // This is a standard Netscape-style bookmark file.
1583         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1584         foreach(explode('<DT>',$data) as $html) // explode is very fast
1585         {
1586             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1587             $d = explode('<DD>',$html);
1588             if (startsWith($d[0], '<A '))
1589             {
1590                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1591                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1592                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1593                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1594                 $raw_add_date=0;
1595                 foreach($matches as $m)
1596                 {
1597                     $attr=$m[1]; $value=$m[2];
1598                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1599                     elseif ($attr=='ADD_DATE')
1600                     {
1601                         $raw_add_date=intval($value);
1602                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1603                     }
1604                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1605                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1606                 }
1607                 if ($link['url']!='')
1608                 {
1609                     if ($private==1) $link['private']=1;
1610                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1611                     if ($dblink==false)
1612                     {  // Link not in database, let's import it...
1613                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1614
1615                        // Make sure date/time is not already used by another link.
1616                        // (Some bookmark files have several different links with the same ADD_DATE)
1617                        // We increment date by 1 second until we find a date which is not used in DB.
1618                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1619                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1620                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1621                        $LINKSDB[$link['linkdate']] = $link;
1622                        $import_count++;
1623                     }
1624                     else // Link already present in database.
1625                     {
1626                         if ($overwrite)
1627                         {   // If overwrite is required, we import link data, except date/time.
1628                             $link['linkdate']=$dblink['linkdate'];
1629                             $LINKSDB[$link['linkdate']] = $link;
1630                             $import_count++;
1631                         }
1632                     }
1633
1634                 }
1635             }
1636         }
1637         $LINKSDB->savedb($conf->get('resource.page_cache'));
1638
1639         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1640     }
1641     else
1642     {
1643         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1644     }
1645 }
1646
1647 /**
1648  * Template for the list of links (<div id="linklist">)
1649  * This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1650  *
1651  * @param pageBuilder   $PAGE          pageBuilder instance.
1652  * @param LinkDB        $LINKSDB       LinkDB instance.
1653  * @param ConfigManager $conf          Configuration Manager instance.
1654  * @param PluginManager $pluginManager Plugin Manager instance.
1655  */
1656 function buildLinkList($PAGE,$LINKSDB, $conf, $pluginManager)
1657 {
1658     // Used in templates
1659     $searchtags = !empty($_GET['searchtags']) ? escape($_GET['searchtags']) : '';
1660     $searchterm = !empty($_GET['searchterm']) ? escape($_GET['searchterm']) : '';
1661
1662     // Smallhash filter
1663     if (! empty($_SERVER['QUERY_STRING'])
1664         && preg_match('/^[a-zA-Z0-9-_@]{6}($|&|#)/', $_SERVER['QUERY_STRING'])) {
1665         try {
1666             $linksToDisplay = $LINKSDB->filterHash($_SERVER['QUERY_STRING']);
1667         } catch (LinkNotFoundException $e) {
1668             $PAGE->render404($e->getMessage());
1669             exit;
1670         }
1671     } else {
1672         // Filter links according search parameters.
1673         $privateonly = !empty($_SESSION['privateonly']);
1674         $linksToDisplay = $LINKSDB->filterSearch($_GET, false, $privateonly);
1675     }
1676
1677     // ---- Handle paging.
1678     $keys = array();
1679     foreach ($linksToDisplay as $key => $value) {
1680         $keys[] = $key;
1681     }
1682
1683
1684
1685     // Select articles according to paging.
1686     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1687     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1688     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1689     $page = $page < 1 ? 1 : $page;
1690     $page = $page > $pagecount ? $pagecount : $page;
1691     // Start index.
1692     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1693     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1694     $linkDisp = array();
1695     while ($i<$end && $i<count($keys))
1696     {
1697         $link = $linksToDisplay[$keys[$i]];
1698         $link['description'] = format_description($link['description'], $conf->get('redirector.url'));
1699         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
1700         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
1701         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
1702         $link['timestamp'] = $date->getTimestamp();
1703         if (! empty($link['updated'])) {
1704             $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['updated']);
1705             $link['updated_timestamp'] = $date->getTimestamp();
1706         } else {
1707             $link['updated_timestamp'] = '';
1708         }
1709         $taglist = explode(' ', $link['tags']);
1710         uasort($taglist, 'strcasecmp');
1711         $link['taglist'] = $taglist;
1712         $link['shorturl'] = smallHash($link['linkdate']);
1713         // Check for both signs of a note: starting with ? and 7 chars long.
1714         if ($link['url'][0] === '?' &&
1715             strlen($link['url']) === 7) {
1716             $link['url'] = index_url($_SERVER) . $link['url'];
1717         }
1718
1719         $linkDisp[$keys[$i]] = $link;
1720         $i++;
1721     }
1722
1723     // Compute paging navigation
1724     $searchtagsUrl = empty($searchtags) ? '' : '&searchtags=' . urlencode($searchtags);
1725     $searchtermUrl = empty($searchterm) ? '' : '&searchterm=' . urlencode($searchterm);
1726     $previous_page_url = '';
1727     if ($i != count($keys)) {
1728         $previous_page_url = '?page=' . ($page+1) . $searchtermUrl . $searchtagsUrl;
1729     }
1730     $next_page_url='';
1731     if ($page>1) {
1732         $next_page_url = '?page=' . ($page-1) . $searchtermUrl . $searchtagsUrl;
1733     }
1734
1735     $token = isLoggedIn() ? getToken($conf) : '';
1736
1737     // Fill all template fields.
1738     $data = array(
1739         'previous_page_url' => $previous_page_url,
1740         'next_page_url' => $next_page_url,
1741         'page_current' => $page,
1742         'page_max' => $pagecount,
1743         'result_count' => count($linksToDisplay),
1744         'search_term' => $searchterm,
1745         'search_tags' => $searchtags,
1746         'redirector' => $conf->get('redirector.url'),  // Optional redirector URL.
1747         'token' => $token,
1748         'links' => $linkDisp,
1749         'tags' => $LINKSDB->allTags(),
1750     );
1751
1752     // If there is only a single link, we change on-the-fly the title of the page.
1753     if (count($linksToDisplay) == 1) {
1754         $data['pagetitle'] = $linksToDisplay[$keys[0]]['title'] .' - '. $conf->get('general.title');
1755     }
1756
1757     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
1758
1759     foreach ($data as $key => $value) {
1760         $PAGE->assign($key, $value);
1761     }
1762
1763     return;
1764 }
1765
1766 /**
1767  * Compute the thumbnail for a link.
1768  *
1769  * With a link to the original URL.
1770  * Understands various services (youtube.com...)
1771  * Input: $url = URL for which the thumbnail must be found.
1772  *        $href = if provided, this URL will be followed instead of $url
1773  * Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1774  * Some of them may be missing.
1775  * Return an empty array if no thumbnail available.
1776  *
1777  * @param ConfigManager $conf Configuration Manager instance.
1778  * @param string        $url
1779  * @param string|bool   $href
1780  *
1781  * @return array
1782  */
1783 function computeThumbnail($conf, $url, $href = false)
1784 {
1785     if (!$conf->get('thumbnail.enable_thumbnails')) return array();
1786     if ($href==false) $href=$url;
1787
1788     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1789     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1790     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1791     $domain = parse_url($url,PHP_URL_HOST);
1792     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1793     {
1794         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1795         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1796                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1797     }
1798     if ($domain=='youtu.be') // Youtube short links
1799     {
1800         $path = parse_url($url,PHP_URL_PATH);
1801         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1802                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1803     }
1804     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1805     {
1806         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1807         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1808                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1809     }
1810
1811     if ($domain=='imgur.com')
1812     {
1813         $path = parse_url($url,PHP_URL_PATH);
1814         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1815         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1816                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1817         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1818                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1819
1820         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1821                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1822     }
1823     if ($domain=='i.imgur.com')
1824     {
1825         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1826         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1827                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1828     }
1829     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1830     {
1831         if (strpos($url,'dailymotion.com/video/')!==false)
1832         {
1833             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1834             return array('src'=>$thumburl,
1835                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1836         }
1837     }
1838     if (endsWith($domain,'.imageshack.us'))
1839     {
1840         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1841         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1842         {
1843             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1844             return array('src'=>$thumburl,
1845                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1846         }
1847     }
1848
1849     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1850     // So we deport the thumbnail generation in order not to slow down page generation
1851     // (and we also cache the thumbnail)
1852
1853     if (! $conf->get('thumbnail.enable_localcache')) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1854
1855     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1856         || $domain=='vimeo.com'
1857         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1858         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1859     )
1860     {
1861         if ($domain=='vimeo.com')
1862         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1863             $path = parse_url($url,PHP_URL_PATH);
1864             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1865         }
1866         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
1867         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
1868             $path = parse_url($url,PHP_URL_PATH);
1869             if (!preg_match('!/\d+.+?!',$path)) return array();
1870         }
1871         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
1872         {   // Make sure this TED URL points to a video (/talks/...)
1873             $path = parse_url($url,PHP_URL_PATH);
1874             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
1875         }
1876         $sign = hash_hmac('sha256', $url, $conf->get('credentials.salt')); // We use the salt to sign data (it's random, secret, and specific to each installation)
1877         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1878                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1879     }
1880
1881     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1882     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1883     // But using the extension will do.
1884     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1885     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1886     {
1887         $sign = hash_hmac('sha256', $url, $conf->get('credentials.salt')); // We use the salt to sign data (it's random, secret, and specific to each installation)
1888         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1889                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1890     }
1891     return array(); // No thumbnail.
1892
1893 }
1894
1895
1896 // Returns the HTML code to display a thumbnail for a link
1897 // with a link to the original URL.
1898 // Understands various services (youtube.com...)
1899 // Input: $url = URL for which the thumbnail must be found.
1900 //        $href = if provided, this URL will be followed instead of $url
1901 // Returns '' if no thumbnail available.
1902 function thumbnail($url,$href=false)
1903 {
1904     // FIXME!
1905     global $conf;
1906     $t = computeThumbnail($conf, $url,$href);
1907     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1908
1909     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
1910     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1911     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1912     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1913     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1914     $html.='></a>';
1915     return $html;
1916 }
1917
1918 // Returns the HTML code to display a thumbnail for a link
1919 // for the picture wall (using lazy image loading)
1920 // Understands various services (youtube.com...)
1921 // Input: $url = URL for which the thumbnail must be found.
1922 //        $href = if provided, this URL will be followed instead of $url
1923 // Returns '' if no thumbnail available.
1924 function lazyThumbnail($conf, $url,$href=false)
1925 {
1926     // FIXME!
1927     global $conf;
1928     $t = computeThumbnail($conf, $url,$href);
1929     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1930
1931     $html='<a href="'.escape($t['href']).'">';
1932
1933     // Lazy image
1934     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
1935
1936     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1937     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1938     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1939     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1940     $html.='>';
1941
1942     // No-JavaScript fallback.
1943     $html.='<noscript><img src="'.escape($t['src']).'"';
1944     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1945     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1946     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1947     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1948     $html.='></noscript></a>';
1949
1950     return $html;
1951 }
1952
1953
1954 /**
1955  * Installation
1956  * This function should NEVER be called if the file data/config.php exists.
1957  *
1958  * @param ConfigManager $conf Configuration Manager instance.
1959  */
1960 function install($conf)
1961 {
1962     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
1963     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
1964
1965
1966     // This part makes sure sessions works correctly.
1967     // (Because on some hosts, session.save_path may not be set correctly,
1968     // or we may not have write access to it.)
1969     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
1970     {   // Step 2: Check if data in session is correct.
1971         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
1972         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
1973         echo 'It currently points to '.session_save_path().'<br>';
1974         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
1975         echo '<br><a href="?">Click to try again.</a></pre>';
1976         die;
1977     }
1978     if (!isset($_SESSION['session_tested']))
1979     {   // Step 1 : Try to store data in session and reload page.
1980         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
1981         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
1982     }
1983     if (isset($_GET['test_session']))
1984     {   // Step 3: Sessions are OK. Remove test parameter from URL.
1985         header('Location: '.index_url($_SERVER));
1986     }
1987
1988
1989     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
1990     {
1991         $tz = 'UTC';
1992         if (!empty($_POST['continent']) && !empty($_POST['city'])
1993             && isTimeZoneValid($_POST['continent'], $_POST['city'])
1994         ) {
1995             $tz = $_POST['continent'].'/'.$_POST['city'];
1996         }
1997         $conf->set('general.timezone', $tz);
1998         $login = $_POST['setlogin'];
1999         $conf->set('credentials.login', $login);
2000         $salt = sha1(uniqid('', true) .'_'. mt_rand());
2001         $conf->set('credentials.salt', $salt);
2002         $conf->set('credentials.hash', sha1($_POST['setpassword'] . $login . $salt));
2003         if (!empty($_POST['title'])) {
2004             $conf->set('general.title', escape($_POST['title']));
2005         } else {
2006             $conf->set('general.title', 'Shared links on '.escape(index_url($_SERVER)));
2007         }
2008         $conf->set('updates.check_updates', !empty($_POST['updateCheck']));
2009         try {
2010             // Everything is ok, let's create config file.
2011             $conf->write(isLoggedIn());
2012         }
2013         catch(Exception $e) {
2014             error_log(
2015                     'ERROR while writing config file after installation.' . PHP_EOL .
2016                     $e->getMessage()
2017                 );
2018
2019             // TODO: do not handle exceptions/errors in JS.
2020             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2021             exit;
2022         }
2023         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2024         exit;
2025     }
2026
2027     // Display config form:
2028     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2029     $timezone_html = '';
2030     if ($timezone_form != '') {
2031         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2032     }
2033
2034     $PAGE = new PageBuilder($conf);
2035     $PAGE->assign('timezone_html',$timezone_html);
2036     $PAGE->assign('timezone_js',$timezone_js);
2037     $PAGE->renderPage('install');
2038     exit;
2039 }
2040
2041 /**
2042  * Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2043  * I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2044  * The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2045  * This function is called by passing the URL:
2046  * http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2047  * [URL] is the URL of the link (e.g. a flickr page)
2048  * [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2049  * The function below will fetch the image from the webservice and store it in the cache.
2050  *
2051  * @param ConfigManager $conf Configuration Manager instance,
2052  */
2053 function genThumbnail($conf)
2054 {
2055     // Make sure the parameters in the URL were generated by us.
2056     $sign = hash_hmac('sha256', $_GET['url'], $conf->get('credentials.salt'));
2057     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2058
2059     $cacheDir = $conf->get('resource.thumbnails_cache', 'cache');
2060     // Let's see if we don't already have the image for this URL in the cache.
2061     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2062     if (is_file($cacheDir .'/'. $thumbname))
2063     {   // We have the thumbnail, just serve it:
2064         header('Content-Type: image/jpeg');
2065         echo file_get_contents($cacheDir .'/'. $thumbname);
2066         return;
2067     }
2068     // We may also serve a blank image (if service did not respond)
2069     $blankname=hash('sha1',$_GET['url']).'.gif';
2070     if (is_file($cacheDir .'/'. $blankname))
2071     {
2072         header('Content-Type: image/gif');
2073         echo file_get_contents($cacheDir .'/'. $blankname);
2074         return;
2075     }
2076
2077     // Otherwise, generate the thumbnail.
2078     $url = $_GET['url'];
2079     $domain = parse_url($url,PHP_URL_HOST);
2080
2081     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2082     {
2083         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2084         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2085
2086         // Is this a link to an image, or to a flickr page ?
2087         $imageurl='';
2088         if (endsWith(parse_url($url, PHP_URL_PATH), '.jpg'))
2089         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2090             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2091             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2092         }
2093         else // This is a flickr page (html)
2094         {
2095             // Get the flickr html page.
2096             list($headers, $content) = get_http_response($url, 20);
2097             if (strpos($headers[0], '200 OK') !== false)
2098             {
2099                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2100                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2101                 if (!empty($matches[1])) $imageurl=$matches[1];
2102
2103                 // In albums (and some other pages), the link rel="image_src" is not provided,
2104                 // but flickr provides:
2105                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2106                 if ($imageurl=='')
2107                 {
2108                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2109                     if (!empty($matches[1])) $imageurl=$matches[1];
2110                 }
2111             }
2112         }
2113
2114         if ($imageurl!='')
2115         {   // Let's download the image.
2116             // Image is 240x120, so 10 seconds to download should be enough.
2117             list($headers, $content) = get_http_response($imageurl, 10);
2118             if (strpos($headers[0], '200 OK') !== false) {
2119                 // Save image to cache.
2120                 file_put_contents($cacheDir .'/'. $thumbname, $content);
2121                 header('Content-Type: image/jpeg');
2122                 echo $content;
2123                 return;
2124             }
2125         }
2126     }
2127
2128     elseif ($domain=='vimeo.com' )
2129     {
2130         // This is more complex: we have to perform a HTTP request, then parse the result.
2131         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2132         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2133         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2134         if (strpos($headers[0], '200 OK') !== false) {
2135             $t = unserialize($content);
2136             $imageurl = $t[0]['thumbnail_medium'];
2137             // Then we download the image and serve it to our client.
2138             list($headers, $content) = get_http_response($imageurl, 10);
2139             if (strpos($headers[0], '200 OK') !== false) {
2140                 // Save image to cache.
2141                 file_put_contents($cacheDir .'/'. $thumbname, $content);
2142                 header('Content-Type: image/jpeg');
2143                 echo $content;
2144                 return;
2145             }
2146         }
2147     }
2148
2149     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2150     {
2151         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2152         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2153         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2154         list($headers, $content) = get_http_response($url, 5);
2155         if (strpos($headers[0], '200 OK') !== false) {
2156             // Extract the link to the thumbnail
2157             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2158             if (!empty($matches[1]))
2159             {   // Let's download the image.
2160                 $imageurl=$matches[1];
2161                 // No control on image size, so wait long enough
2162                 list($headers, $content) = get_http_response($imageurl, 20);
2163                 if (strpos($headers[0], '200 OK') !== false) {
2164                     $filepath = $cacheDir .'/'. $thumbname;
2165                     file_put_contents($filepath, $content); // Save image to cache.
2166                     if (resizeImage($filepath))
2167                     {
2168                         header('Content-Type: image/jpeg');
2169                         echo file_get_contents($filepath);
2170                         return;
2171                     }
2172                 }
2173             }
2174         }
2175     }
2176
2177     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2178     {
2179         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2180         // http://xkcd.com/327/
2181         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2182         list($headers, $content) = get_http_response($url, 5);
2183         if (strpos($headers[0], '200 OK') !== false) {
2184             // Extract the link to the thumbnail
2185             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2186             if (!empty($matches[1]))
2187             {   // Let's download the image.
2188                 $imageurl=$matches[1];
2189                 // No control on image size, so wait long enough
2190                 list($headers, $content) = get_http_response($imageurl, 20);
2191                 if (strpos($headers[0], '200 OK') !== false) {
2192                     $filepath = $cacheDir.'/'.$thumbname;
2193                     // Save image to cache.
2194                     file_put_contents($filepath, $content);
2195                     if (resizeImage($filepath))
2196                     {
2197                         header('Content-Type: image/jpeg');
2198                         echo file_get_contents($filepath);
2199                         return;
2200                     }
2201                 }
2202             }
2203         }
2204     }
2205
2206     else
2207     {
2208         // For all other domains, we try to download the image and make a thumbnail.
2209         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2210         list($headers, $content) = get_http_response($url, 30);
2211         if (strpos($headers[0], '200 OK') !== false) {
2212             $filepath = $cacheDir .'/'.$thumbname;
2213             // Save image to cache.
2214             file_put_contents($filepath, $content);
2215             if (resizeImage($filepath))
2216             {
2217                 header('Content-Type: image/jpeg');
2218                 echo file_get_contents($filepath);
2219                 return;
2220             }
2221         }
2222     }
2223
2224
2225     // Otherwise, return an empty image (8x8 transparent gif)
2226     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2227     // Also put something in cache so that this URL is not requested twice.
2228     file_put_contents($cacheDir .'/'. $blankname, $blankgif);
2229     header('Content-Type: image/gif');
2230     echo $blankgif;
2231 }
2232
2233 // Make a thumbnail of the image (to width: 120 pixels)
2234 // Returns true if success, false otherwise.
2235 function resizeImage($filepath)
2236 {
2237     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2238
2239     // Trick: some stupid people rename GIF as JPEG... or else.
2240     // So we really try to open each image type whatever the extension is.
2241     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2242     $im=false;
2243     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2244     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2245     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2246     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2247     $w = imagesx($im);
2248     $h = imagesy($im);
2249     $ystart = 0; $yheight=$h;
2250     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2251     $nw = 120;   // Desired width
2252     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2253     // Resize image:
2254     $im2 = imagecreatetruecolor($nw,$nh);
2255     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2256     imageinterlace($im2,true); // For progressive JPEG.
2257     $tempname=$filepath.'_TEMP.jpg';
2258     imagejpeg($im2, $tempname, 90);
2259     imagedestroy($im);
2260     imagedestroy($im2);
2261     unlink($filepath);
2262     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2263     return true;
2264 }
2265
2266 if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=genthumbnail')) { genThumbnail($conf); exit; }  // Thumbnail generation/cache does not need the link database.
2267 if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=dailyrss')) { showDailyRSS($conf); exit; }
2268 if (!isset($_SESSION['LINKS_PER_PAGE'])) {
2269     $_SESSION['LINKS_PER_PAGE'] = $conf->get('general.links_per_page', 20);
2270 }
2271 renderPage($conf, $pluginManager);