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         if (isset($_GET['username'])) {
 787             $PAGE->assign('username', escape($_GET['username']));
 788         }
 789         $PAGE->assign('returnurl',(isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']):''));
 790         $PAGE->renderPage('loginform');
 791         exit;
 792     }
 793     // -------- User wants to logout.
 794     if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=logout'))
 795     {
 796         invalidateCaches($conf->get('resource.page_cache'));
 797         logout();
 798         header('Location: ?');
 799         exit;
 800     }
 801
 802     // -------- Picture wall
 803     if ($targetPage == Router::$PAGE_PICWALL)
 804     {
 805         // Optionally filter the results:
 806         $links = $LINKSDB->filterSearch($_GET);
 807         $linksToDisplay = array();
 808
 809         // Get only links which have a thumbnail.
 810         foreach($links as $link)
 811         {
 812             $permalink='?'.escape(smallhash($link['linkdate']));
 813             $thumb=lazyThumbnail($conf, $link['url'],$permalink);
 814             if ($thumb!='') // Only output links which have a thumbnail.
 815             {
 816                 $link['thumbnail']=$thumb; // Thumbnail HTML code.
 817                 $linksToDisplay[]=$link; // Add to array.
 818             }
 819         }
 820
 821         $data = array(
 822             'linksToDisplay' => $linksToDisplay,
 823         );
 824         $pluginManager->executeHooks('render_picwall', $data, array('loggedin' => isLoggedIn()));
 825
 826         foreach ($data as $key => $value) {
 827             $PAGE->assign($key, $value);
 828         }
 829
 830         $PAGE->renderPage('picwall');
 831         exit;
 832     }
 833
 834     // -------- Tag cloud
 835     if ($targetPage == Router::$PAGE_TAGCLOUD)
 836     {
 837         $tags= $LINKSDB->allTags();
 838
 839         // We sort tags alphabetically, then choose a font size according to count.
 840         // First, find max value.
 841         $maxcount = 0;
 842         foreach ($tags as $value) {
 843             $maxcount = max($maxcount, $value);
 844         }
 845
 846         // Sort tags alphabetically: case insensitive, support locale if avalaible.
 847         uksort($tags, function($a, $b) {
 848             // Collator is part of PHP intl.
 849             if (class_exists('Collator')) {
 850                 $c = new Collator(setlocale(LC_COLLATE, 0));
 851                 if (!intl_is_failure(intl_get_error_code())) {
 852                     return $c->compare($a, $b);
 853                 }
 854             }
 855             return strcasecmp($a, $b);
 856         });
 857
 858         $tagList = array();
 859         foreach($tags as $key => $value) {
 860             // Tag font size scaling:
 861             //   default 15 and 30 logarithm bases affect scaling,
 862             //   22 and 6 are arbitrary font sizes for max and min sizes.
 863             $size = log($value, 15) / log($maxcount, 30) * 2.2 + 0.8;
 864             $tagList[$key] = array(
 865                 'count' => $value,
 866                 'size' => number_format($size, 2, '.', ''),
 867             );
 868         }
 869
 870         $data = array(
 871             'tags' => $tagList,
 872         );
 873         $pluginManager->executeHooks('render_tagcloud', $data, array('loggedin' => isLoggedIn()));
 874
 875         foreach ($data as $key => $value) {
 876             $PAGE->assign($key, $value);
 877         }
 878
 879         $PAGE->renderPage('tagcloud');
 880         exit;
 881     }
 882
 883     // Daily page.
 884     if ($targetPage == Router::$PAGE_DAILY) {
 885         showDaily($PAGE, $LINKSDB, $conf, $pluginManager);
 886     }
 887
 888     // ATOM and RSS feed.
 889     if ($targetPage == Router::$PAGE_FEED_ATOM || $targetPage == Router::$PAGE_FEED_RSS) {
 890         $feedType = $targetPage == Router::$PAGE_FEED_RSS ? FeedBuilder::$FEED_RSS : FeedBuilder::$FEED_ATOM;
 891         header('Content-Type: application/'. $feedType .'+xml; charset=utf-8');
 892
 893         // Cache system
 894         $query = $_SERVER['QUERY_STRING'];
 895         $cache = new CachedPage(
 896             $conf->get('resource.page_cache'),
 897             page_url($_SERVER),
 898             startsWith($query,'do='. $targetPage) && !isLoggedIn()
 899         );
 900         $cached = $cache->cachedVersion();
 901         if (!empty($cached)) {
 902             echo $cached;
 903             exit;
 904         }
 905
 906         // Generate data.
 907         $feedGenerator = new FeedBuilder($LINKSDB, $feedType, $_SERVER, $_GET, isLoggedIn());
 908         $feedGenerator->setLocale(strtolower(setlocale(LC_COLLATE, 0)));
 909         $feedGenerator->setHideDates($conf->get('privacy.hide_timestamps') && !isLoggedIn());
 910         $feedGenerator->setUsePermalinks(isset($_GET['permalinks']) || !$conf->get('feed.rss_permalinks'));
 911         $pshUrl = $conf->get('config.PUBSUBHUB_URL');
 912         if (!empty($pshUrl)) {
 913             $feedGenerator->setPubsubhubUrl($pshUrl);
 914         }
 915         $data = $feedGenerator->buildData();
 916
 917         // Process plugin hook.
 918         $pluginManager->executeHooks('render_feed', $data, array(
 919             'loggedin' => isLoggedIn(),
 920             'target' => $targetPage,
 921         ));
 922
 923         // Render the template.
 924         $PAGE->assignAll($data);
 925         $PAGE->renderPage('feed.'. $feedType);
 926         $cache->cache(ob_get_contents());
 927         ob_end_flush();
 928         exit;
 929     }
 930
 931     // Display openseach plugin (XML)
 932     if ($targetPage == Router::$PAGE_OPENSEARCH) {
 933         header('Content-Type: application/xml; charset=utf-8');
 934         $PAGE->assign('serverurl', index_url($_SERVER));
 935         $PAGE->renderPage('opensearch');
 936         exit;
 937     }
 938
 939     // -------- User clicks on a tag in a link: The tag is added to the list of searched tags (searchtags=...)
 940     if (isset($_GET['addtag']))
 941     {
 942         // Get previous URL (http_referer) and add the tag to the searchtags parameters in query.
 943         if (empty($_SERVER['HTTP_REFERER'])) { header('Location: ?searchtags='.urlencode($_GET['addtag'])); exit; } // In case browser does not send HTTP_REFERER
 944         parse_str(parse_url($_SERVER['HTTP_REFERER'],PHP_URL_QUERY), $params);
 945
 946         // Prevent redirection loop
 947         if (isset($params['addtag'])) {
 948             unset($params['addtag']);
 949         }
 950
 951         // Check if this tag is already in the search query and ignore it if it is.
 952         // Each tag is always separated by a space
 953         if (isset($params['searchtags'])) {
 954             $current_tags = explode(' ', $params['searchtags']);
 955         } else {
 956             $current_tags = array();
 957         }
 958         $addtag = true;
 959         foreach ($current_tags as $value) {
 960             if ($value === $_GET['addtag']) {
 961                 $addtag = false;
 962                 break;
 963             }
 964         }
 965         // Append the tag if necessary
 966         if (empty($params['searchtags'])) {
 967             $params['searchtags'] = trim($_GET['addtag']);
 968         }
 969         else if ($addtag) {
 970             $params['searchtags'] = trim($params['searchtags']).' '.trim($_GET['addtag']);
 971         }
 972
 973         unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
 974         header('Location: ?'.http_build_query($params));
 975         exit;
 976     }
 977
 978     // -------- User clicks on a tag in result count: Remove the tag from the list of searched tags (searchtags=...)
 979     if (isset($_GET['removetag'])) {
 980         // Get previous URL (http_referer) and remove the tag from the searchtags parameters in query.
 981         if (empty($_SERVER['HTTP_REFERER'])) {
 982             header('Location: ?');
 983             exit;
 984         }
 985
 986         // In case browser does not send HTTP_REFERER
 987         parse_str(parse_url($_SERVER['HTTP_REFERER'], PHP_URL_QUERY), $params);
 988
 989         // Prevent redirection loop
 990         if (isset($params['removetag'])) {
 991             unset($params['removetag']);
 992         }
 993
 994         if (isset($params['searchtags'])) {
 995             $tags = explode(' ', $params['searchtags']);
 996             // Remove value from array $tags.
 997             $tags = array_diff($tags, array($_GET['removetag']));
 998             $params['searchtags'] = implode(' ',$tags);
 999
1000             if (empty($params['searchtags'])) {
1001                 unset($params['searchtags']);
1002             }
1003
1004             unset($params['page']); // We also remove page (keeping the same page has no sense, since the results are different)
1005         }
1006         header('Location: ?'.http_build_query($params));
1007         exit;
1008     }
1009
1010     // -------- User wants to change the number of links per page (linksperpage=...)
1011     if (isset($_GET['linksperpage'])) {
1012         if (is_numeric($_GET['linksperpage'])) {
1013             $_SESSION['LINKS_PER_PAGE']=abs(intval($_GET['linksperpage']));
1014         }
1015
1016         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('linksperpage')));
1017         exit;
1018     }
1019
1020     // -------- User wants to see only private links (toggle)
1021     if (isset($_GET['privateonly'])) {
1022         if (empty($_SESSION['privateonly'])) {
1023             $_SESSION['privateonly'] = 1; // See only private links
1024         } else {
1025             unset($_SESSION['privateonly']); // See all links
1026         }
1027
1028         header('Location: '. generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('privateonly')));
1029         exit;
1030     }
1031
1032     // -------- Handle other actions allowed for non-logged in users:
1033     if (!isLoggedIn())
1034     {
1035         // User tries to post new link but is not logged in:
1036         // Show login screen, then redirect to ?post=...
1037         if (isset($_GET['post']))
1038         {
1039             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($_GET['source']):'')); // Redirect to login page, then back to post link.
1040             exit;
1041         }
1042
1043         showLinkList($PAGE, $LINKSDB, $conf, $pluginManager);
1044         if (isset($_GET['edit_link'])) {
1045             header('Location: ?do=login&edit_link='. escape($_GET['edit_link']));
1046             exit;
1047         }
1048
1049         exit; // Never remove this one! All operations below are reserved for logged in user.
1050     }
1051
1052     // -------- All other functions are reserved for the registered user:
1053
1054     // -------- Display the Tools menu if requested (import/export/bookmarklet...)
1055     if ($targetPage == Router::$PAGE_TOOLS)
1056     {
1057         $data = array(
1058             'pageabsaddr' => index_url($_SERVER),
1059         );
1060         $pluginManager->executeHooks('render_tools', $data);
1061
1062         foreach ($data as $key => $value) {
1063             $PAGE->assign($key, $value);
1064         }
1065
1066         $PAGE->renderPage('tools');
1067         exit;
1068     }
1069
1070     // -------- User wants to change his/her password.
1071     if ($targetPage == Router::$PAGE_CHANGEPASSWORD)
1072     {
1073         if ($conf->get('security.open_shaarli')) {
1074             die('You are not supposed to change a password on an Open Shaarli.');
1075         }
1076
1077         if (!empty($_POST['setpassword']) && !empty($_POST['oldpassword']))
1078         {
1079             if (!tokenOk($_POST['token'])) die('Wrong token.'); // Go away!
1080
1081             // Make sure old password is correct.
1082             $oldhash = sha1($_POST['oldpassword'].$conf->get('credentials.login').$conf->get('credentials.salt'));
1083             if ($oldhash!= $conf->get('credentials.hash')) { echo '<script>alert("The old password is not correct.");document.location=\'?do=changepasswd\';</script>'; exit; }
1084             // Save new password
1085             // Salt renders rainbow-tables attacks useless.
1086             $conf->set('credentials.salt', sha1(uniqid('', true) .'_'. mt_rand()));
1087             $conf->set('credentials.hash', sha1($_POST['setpassword'] . $conf->get('credentials.login') . $conf->get('credentials.salt')));
1088             try {
1089                 $conf->write(isLoggedIn());
1090             }
1091             catch(Exception $e) {
1092                 error_log(
1093                     'ERROR while writing config file after changing password.' . PHP_EOL .
1094                     $e->getMessage()
1095                 );
1096
1097                 // TODO: do not handle exceptions/errors in JS.
1098                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=tools\';</script>';
1099                 exit;
1100             }
1101             echo '<script>alert("Your password has been changed.");document.location=\'?do=tools\';</script>';
1102             exit;
1103         }
1104         else // show the change password form.
1105         {
1106             $PAGE->renderPage('changepassword');
1107             exit;
1108         }
1109     }
1110
1111     // -------- User wants to change configuration
1112     if ($targetPage == Router::$PAGE_CONFIGURE)
1113     {
1114         if (!empty($_POST['title']) )
1115         {
1116             if (!tokenOk($_POST['token'])) {
1117                 die('Wrong token.'); // Go away!
1118             }
1119             $tz = 'UTC';
1120             if (!empty($_POST['continent']) && !empty($_POST['city'])
1121                 && isTimeZoneValid($_POST['continent'], $_POST['city'])
1122             ) {
1123                 $tz = $_POST['continent'] . '/' . $_POST['city'];
1124             }
1125             $conf->set('general.timezone', $tz);
1126             $conf->set('general.title', escape($_POST['title']));
1127             $conf->set('general.header_link', escape($_POST['titleLink']));
1128             $conf->set('redirector.url', escape($_POST['redirector']));
1129             $conf->set('security.session_protection_disabled', !empty($_POST['disablesessionprotection']));
1130             $conf->set('privacy.default_private_links', !empty($_POST['privateLinkByDefault']));
1131             $conf->set('feed.rss_permalinks', !empty($_POST['enableRssPermalinks']));
1132             $conf->set('updates.check_updates', !empty($_POST['updateCheck']));
1133             $conf->set('privacy.hide_public_links', !empty($_POST['hidePublicLinks']));
1134             try {
1135                 $conf->write(isLoggedIn());
1136             }
1137             catch(Exception $e) {
1138                 error_log(
1139                     'ERROR while writing config file after configuration update.' . PHP_EOL .
1140                     $e->getMessage()
1141                 );
1142
1143                 // TODO: do not handle exceptions/errors in JS.
1144                 echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do=configure\';</script>';
1145                 exit;
1146             }
1147             echo '<script>alert("Configuration was saved.");document.location=\'?do=configure\';</script>';
1148             exit;
1149         }
1150         else // Show the configuration form.
1151         {
1152             $PAGE->assign('title', $conf->get('general.title'));
1153             $PAGE->assign('redirector', $conf->get('redirector.url'));
1154             list($timezone_form, $timezone_js) = generateTimeZoneForm($conf->get('general.timezone'));
1155             $PAGE->assign('timezone_form', $timezone_form);
1156             $PAGE->assign('timezone_js',$timezone_js);
1157             $PAGE->assign('private_links_default', $conf->get('privacy.default_private_links', false));
1158             $PAGE->assign('session_protection_disabled', $conf->get('security.session_protection_disabled', false));
1159             $PAGE->assign('enable_rss_permalinks', $conf->get('feed.rss_permalinks', false));
1160             $PAGE->assign('enable_update_check', $conf->get('updates.check_updates', true));
1161             $PAGE->assign('hide_public_links', $conf->get('privacy.hide_public_links', false));
1162             $PAGE->renderPage('configure');
1163             exit;
1164         }
1165     }
1166
1167     // -------- User wants to rename a tag or delete it
1168     if ($targetPage == Router::$PAGE_CHANGETAG)
1169     {
1170         if (empty($_POST['fromtag']) || (empty($_POST['totag']) && isset($_POST['renametag']))) {
1171             $PAGE->assign('tags', $LINKSDB->allTags());
1172             $PAGE->renderPage('changetag');
1173             exit;
1174         }
1175
1176         if (!tokenOk($_POST['token'])) {
1177             die('Wrong token.');
1178         }
1179
1180         // Delete a tag:
1181         if (isset($_POST['deletetag']) && !empty($_POST['fromtag'])) {
1182             $needle = trim($_POST['fromtag']);
1183             // True for case-sensitive tag search.
1184             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1185             foreach($linksToAlter as $key=>$value)
1186             {
1187                 $tags = explode(' ',trim($value['tags']));
1188                 unset($tags[array_search($needle,$tags)]); // Remove tag.
1189                 $value['tags']=trim(implode(' ',$tags));
1190                 $LINKSDB[$key]=$value;
1191             }
1192             $LINKSDB->savedb($conf->get('resource.page_cache'));
1193             echo '<script>alert("Tag was removed from '.count($linksToAlter).' links.");document.location=\'?\';</script>';
1194             exit;
1195         }
1196
1197         // Rename a tag:
1198         if (isset($_POST['renametag']) && !empty($_POST['fromtag']) && !empty($_POST['totag'])) {
1199             $needle = trim($_POST['fromtag']);
1200             // True for case-sensitive tag search.
1201             $linksToAlter = $LINKSDB->filterSearch(array('searchtags' => $needle), true);
1202             foreach($linksToAlter as $key=>$value)
1203             {
1204                 $tags = explode(' ',trim($value['tags']));
1205                 $tags[array_search($needle,$tags)] = trim($_POST['totag']); // Replace tags value.
1206                 $value['tags']=trim(implode(' ',$tags));
1207                 $LINKSDB[$key]=$value;
1208             }
1209             $LINKSDB->savedb($conf->get('resource.page_cache')); // Save to disk.
1210             echo '<script>alert("Tag was renamed in '.count($linksToAlter).' links.");document.location=\'?searchtags='.urlencode($_POST['totag']).'\';</script>';
1211             exit;
1212         }
1213     }
1214
1215     // -------- User wants to add a link without using the bookmarklet: Show form.
1216     if ($targetPage == Router::$PAGE_ADDLINK)
1217     {
1218         $PAGE->renderPage('addlink');
1219         exit;
1220     }
1221
1222     // -------- User clicked the "Save" button when editing a link: Save link to database.
1223     if (isset($_POST['save_edit']))
1224     {
1225         // Go away!
1226         if (! tokenOk($_POST['token'])) {
1227             die('Wrong token.');
1228         }
1229         // Remove multiple spaces.
1230         $tags = trim(preg_replace('/\s\s+/', ' ', $_POST['lf_tags']));
1231         // Remove first '-' char in tags.
1232         $tags = preg_replace('/(^| )\-/', '$1', $tags);
1233         // Remove duplicates.
1234         $tags = implode(' ', array_unique(explode(' ', $tags)));
1235         $linkdate = $_POST['lf_linkdate'];
1236         $url = trim($_POST['lf_url']);
1237         if (! startsWith($url, 'http:') && ! startsWith($url, 'https:')
1238             && ! startsWith($url, 'ftp:') && ! startsWith($url, 'magnet:')
1239             && ! startsWith($url, '?') && ! startsWith($url, 'javascript:')
1240         ) {
1241             $url = 'http://' . $url;
1242         }
1243
1244         $link = array(
1245             'title' => trim($_POST['lf_title']),
1246             'url' => $url,
1247             'description' => $_POST['lf_description'],
1248             'private' => (isset($_POST['lf_private']) ? 1 : 0),
1249             'linkdate' => $linkdate,
1250             'tags' => str_replace(',', ' ', $tags)
1251         );
1252         // If title is empty, use the URL as title.
1253         if ($link['title'] == '') {
1254             $link['title'] = $link['url'];
1255         }
1256
1257         $pluginManager->executeHooks('save_link', $link);
1258
1259         $LINKSDB[$linkdate] = $link;
1260         $LINKSDB->savedb($conf->get('resource.page_cache'));
1261         pubsubhub($conf);
1262
1263         // If we are called from the bookmarklet, we must close the popup:
1264         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) {
1265             echo '<script>self.close();</script>';
1266             exit;
1267         }
1268
1269         $returnurl = !empty($_POST['returnurl']) ? $_POST['returnurl'] : '?';
1270         $location = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1271         // Scroll to the link which has been edited.
1272         $location .= '#' . smallHash($_POST['lf_linkdate']);
1273         // After saving the link, redirect to the page the user was on.
1274         header('Location: '. $location);
1275         exit;
1276     }
1277
1278     // -------- User clicked the "Cancel" button when editing a link.
1279     if (isset($_POST['cancel_edit']))
1280     {
1281         // If we are called from the bookmarklet, we must close the popup:
1282         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1283         $returnurl = ( isset($_POST['returnurl']) ? $_POST['returnurl'] : '?' );
1284         $returnurl .= '#'.smallHash($_POST['lf_linkdate']);  // Scroll to the link which has been edited.
1285         $returnurl = generateLocation($returnurl, $_SERVER['HTTP_HOST'], array('addlink', 'post', 'edit_link'));
1286         header('Location: '.$returnurl); // After canceling, redirect to the page the user was on.
1287         exit;
1288     }
1289
1290     // -------- User clicked the "Delete" button when editing a link: Delete link from database.
1291     if (isset($_POST['delete_link']))
1292     {
1293         if (!tokenOk($_POST['token'])) die('Wrong token.');
1294         // We do not need to ask for confirmation:
1295         // - confirmation is handled by JavaScript
1296         // - we are protected from XSRF by the token.
1297         $linkdate=$_POST['lf_linkdate'];
1298
1299         $pluginManager->executeHooks('delete_link', $LINKSDB[$linkdate]);
1300
1301         unset($LINKSDB[$linkdate]);
1302         $LINKSDB->savedb('resource.page_cache'); // save to disk
1303
1304         // If we are called from the bookmarklet, we must close the popup:
1305         if (isset($_GET['source']) && ($_GET['source']=='bookmarklet' || $_GET['source']=='firefoxsocialapi')) { echo '<script>self.close();</script>'; exit; }
1306         // Pick where we're going to redirect
1307         // =============================================================
1308         // Basically, we can't redirect to where we were previously if it was a permalink
1309         // or an edit_link, because it would 404.
1310         // Cases:
1311         //    - /             : nothing in $_GET, redirect to self
1312         //    - /?page        : redirect to self
1313         //    - /?searchterm  : redirect to self (there might be other links)
1314         //    - /?searchtags  : redirect to self
1315         //    - /permalink    : redirect to / (the link does not exist anymore)
1316         //    - /?edit_link   : redirect to / (the link does not exist anymore)
1317         // PHP treats the permalink as a $_GET variable, so we need to check if every condition for self
1318         // redirect is not satisfied, and only then redirect to /
1319         $location = "?";
1320         // Self redirection
1321         if (count($_GET) == 0
1322             || isset($_GET['page'])
1323             || isset($_GET['searchterm'])
1324             || isset($_GET['searchtags'])
1325         ) {
1326             if (isset($_POST['returnurl'])) {
1327                 $location = $_POST['returnurl']; // Handle redirects given by the form
1328             } else {
1329                 $location = generateLocation($_SERVER['HTTP_REFERER'], $_SERVER['HTTP_HOST'], array('delete_link'));
1330             }
1331         }
1332
1333         header('Location: ' . $location); // After deleting the link, redirect to appropriate location
1334         exit;
1335     }
1336
1337     // -------- User clicked the "EDIT" button on a link: Display link edit form.
1338     if (isset($_GET['edit_link']))
1339     {
1340         $link = $LINKSDB[$_GET['edit_link']];  // Read database
1341         if (!$link) { header('Location: ?'); exit; } // Link not found in database.
1342         $data = array(
1343             'link' => $link,
1344             'link_is_new' => false,
1345             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1346             'tags' => $LINKSDB->allTags(),
1347         );
1348         $pluginManager->executeHooks('render_editlink', $data);
1349
1350         foreach ($data as $key => $value) {
1351             $PAGE->assign($key, $value);
1352         }
1353
1354         $PAGE->renderPage('editlink');
1355         exit;
1356     }
1357
1358     // -------- User want to post a new link: Display link edit form.
1359     if (isset($_GET['post'])) {
1360         $url = cleanup_url($_GET['post']);
1361
1362         $link_is_new = false;
1363         // Check if URL is not already in database (in this case, we will edit the existing link)
1364         $link = $LINKSDB->getLinkFromUrl($url);
1365         if (!$link)
1366         {
1367             $link_is_new = true;
1368             $linkdate = strval(date('Ymd_His'));
1369             // Get title if it was provided in URL (by the bookmarklet).
1370             $title = empty($_GET['title']) ? '' : escape($_GET['title']);
1371             // Get description if it was provided in URL (by the bookmarklet). [Bronco added that]
1372             $description = empty($_GET['description']) ? '' : escape($_GET['description']);
1373             $tags = empty($_GET['tags']) ? '' : escape($_GET['tags']);
1374             $private = !empty($_GET['private']) && $_GET['private'] === "1" ? 1 : 0;
1375             // If this is an HTTP(S) link, we try go get the page to extract the title (otherwise we will to straight to the edit form.)
1376             if (empty($title) && strpos(get_url_scheme($url), 'http') !== false) {
1377                 // Short timeout to keep the application responsive
1378                 list($headers, $content) = get_http_response($url, 4);
1379                 if (strpos($headers[0], '200 OK') !== false) {
1380                     // Retrieve charset.
1381                     $charset = get_charset($headers, $content);
1382                     // Extract title.
1383                     $title = html_extract_title($content);
1384                     // Re-encode title in utf-8 if necessary.
1385                     if (! empty($title) && strtolower($charset) != 'utf-8') {
1386                         $title = mb_convert_encoding($title, 'utf-8', $charset);
1387                     }
1388                 }
1389             }
1390
1391             if ($url == '') {
1392                 $url = '?' . smallHash($linkdate);
1393                 $title = 'Note: ';
1394             }
1395             $url = escape($url);
1396             $title = escape($title);
1397
1398             $link = array(
1399                 'linkdate' => $linkdate,
1400                 'title' => $title,
1401                 'url' => $url,
1402                 'description' => $description,
1403                 'tags' => $tags,
1404                 'private' => $private
1405             );
1406         }
1407
1408         $data = array(
1409             'link' => $link,
1410             'link_is_new' => $link_is_new,
1411             'http_referer' => (isset($_SERVER['HTTP_REFERER']) ? escape($_SERVER['HTTP_REFERER']) : ''),
1412             'source' => (isset($_GET['source']) ? $_GET['source'] : ''),
1413             'tags' => $LINKSDB->allTags(),
1414             'default_private_links' => $conf->get('default_private_links', false),
1415         );
1416         $pluginManager->executeHooks('render_editlink', $data);
1417
1418         foreach ($data as $key => $value) {
1419             $PAGE->assign($key, $value);
1420         }
1421
1422         $PAGE->renderPage('editlink');
1423         exit;
1424     }
1425
1426     if ($targetPage == Router::$PAGE_EXPORT) {
1427         // Export links as a Netscape Bookmarks file
1428
1429         if (empty($_GET['selection'])) {
1430             $PAGE->renderPage('export');
1431             exit;
1432         }
1433
1434         // export as bookmarks_(all|private|public)_YYYYmmdd_HHMMSS.html
1435         $selection = $_GET['selection'];
1436         if (isset($_GET['prepend_note_url'])) {
1437             $prependNoteUrl = $_GET['prepend_note_url'];
1438         } else {
1439             $prependNoteUrl = false;
1440         }
1441
1442         try {
1443             $PAGE->assign(
1444                 'links',
1445                 NetscapeBookmarkUtils::filterAndFormat(
1446                     $LINKSDB,
1447                     $selection,
1448                     $prependNoteUrl,
1449                     index_url($_SERVER)
1450                 )
1451             );
1452         } catch (Exception $exc) {
1453             header('Content-Type: text/plain; charset=utf-8');
1454             echo $exc->getMessage();
1455             exit;
1456         }
1457         $now = new DateTime();
1458         header('Content-Type: text/html; charset=utf-8');
1459         header(
1460             'Content-disposition: attachment; filename=bookmarks_'
1461            .$selection.'_'.$now->format(LinkDB::LINK_DATE_FORMAT).'.html'
1462         );
1463         $PAGE->assign('date', $now->format(DateTime::RFC822));
1464         $PAGE->assign('eol', PHP_EOL);
1465         $PAGE->assign('selection', $selection);
1466         $PAGE->renderPage('export.bookmarks');
1467         exit;
1468     }
1469
1470     // -------- User is uploading a file for import
1471     if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=upload'))
1472     {
1473         // If file is too big, some form field may be missing.
1474         if (!isset($_POST['token']) || (!isset($_FILES)) || (isset($_FILES['filetoupload']['size']) && $_FILES['filetoupload']['size']==0))
1475         {
1476             $returnurl = ( empty($_SERVER['HTTP_REFERER']) ? '?' : $_SERVER['HTTP_REFERER'] );
1477             echo '<script>alert("The file you are trying to upload is probably bigger than what this webserver can accept ('.getMaxFileSize().' bytes). Please upload in smaller chunks.");document.location=\''.escape($returnurl).'\';</script>';
1478             exit;
1479         }
1480         if (!tokenOk($_POST['token'])) die('Wrong token.');
1481         importFile($LINKSDB);
1482         exit;
1483     }
1484
1485     // -------- Show upload/import dialog:
1486     if ($targetPage == Router::$PAGE_IMPORT)
1487     {
1488         $PAGE->assign('maxfilesize',getMaxFileSize());
1489         $PAGE->renderPage('import');
1490         exit;
1491     }
1492
1493     // Plugin administration page
1494     if ($targetPage == Router::$PAGE_PLUGINSADMIN) {
1495         $pluginMeta = $pluginManager->getPluginsMeta();
1496
1497         // Split plugins into 2 arrays: ordered enabled plugins and disabled.
1498         $enabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] !== false; });
1499         // Load parameters.
1500         $enabledPlugins = load_plugin_parameter_values($enabledPlugins, $conf->get('plugins', array()));
1501         uasort(
1502             $enabledPlugins,
1503             function($a, $b) { return $a['order'] - $b['order']; }
1504         );
1505         $disabledPlugins = array_filter($pluginMeta, function($v) { return $v['order'] === false; });
1506
1507         $PAGE->assign('enabledPlugins', $enabledPlugins);
1508         $PAGE->assign('disabledPlugins', $disabledPlugins);
1509         $PAGE->renderPage('pluginsadmin');
1510         exit;
1511     }
1512
1513     // Plugin administration form action
1514     if ($targetPage == Router::$PAGE_SAVE_PLUGINSADMIN) {
1515         try {
1516             if (isset($_POST['parameters_form'])) {
1517                 unset($_POST['parameters_form']);
1518                 foreach ($_POST as $param => $value) {
1519                     $conf->set('plugins.'. $param, escape($value));
1520                 }
1521             }
1522             else {
1523                 $conf->set('general.enabled_plugins', save_plugin_config($_POST));
1524             }
1525             $conf->write(isLoggedIn());
1526         }
1527         catch (Exception $e) {
1528             error_log(
1529                 'ERROR while saving plugin configuration:.' . PHP_EOL .
1530                 $e->getMessage()
1531             );
1532
1533             // TODO: do not handle exceptions/errors in JS.
1534             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?do='. Router::$PAGE_PLUGINSADMIN .'\';</script>';
1535             exit;
1536         }
1537         header('Location: ?do='. Router::$PAGE_PLUGINSADMIN);
1538         exit;
1539     }
1540
1541     // -------- Otherwise, simply display search form and links:
1542     showLinkList($PAGE, $LINKSDB, $conf, $pluginManager);
1543     exit;
1544 }
1545
1546 /**
1547  * Process the import file form.
1548  *
1549  * @param LinkDB        $LINKSDB Loaded LinkDB instance.
1550  * @param ConfigManager $conf    Configuration Manager instance.
1551  */
1552 function importFile($LINKSDB, $conf)
1553 {
1554     if (!isLoggedIn()) { die('Not allowed.'); }
1555
1556     $filename=$_FILES['filetoupload']['name'];
1557     $filesize=$_FILES['filetoupload']['size'];
1558     $data=file_get_contents($_FILES['filetoupload']['tmp_name']);
1559     $private = (empty($_POST['private']) ? 0 : 1); // Should the links be imported as private?
1560     $overwrite = !empty($_POST['overwrite']) ; // Should the imported links overwrite existing ones?
1561     $import_count=0;
1562
1563     // Sniff file type:
1564     $type='unknown';
1565     if (startsWith($data,'<!DOCTYPE NETSCAPE-Bookmark-file-1>')) $type='netscape'; // Netscape bookmark file (aka Firefox).
1566
1567     // Then import the bookmarks.
1568     if ($type=='netscape')
1569     {
1570         // This is a standard Netscape-style bookmark file.
1571         // This format is supported by all browsers (except IE, of course), also Delicious, Diigo and others.
1572         foreach(explode('<DT>',$data) as $html) // explode is very fast
1573         {
1574             $link = array('linkdate'=>'','title'=>'','url'=>'','description'=>'','tags'=>'','private'=>0);
1575             $d = explode('<DD>',$html);
1576             if (startsWith($d[0], '<A '))
1577             {
1578                 $link['description'] = (isset($d[1]) ? html_entity_decode(trim($d[1]),ENT_QUOTES,'UTF-8') : '');  // Get description (optional)
1579                 preg_match('!<A .*?>(.*?)</A>!i',$d[0],$matches); $link['title'] = (isset($matches[1]) ? trim($matches[1]) : '');  // Get title
1580                 $link['title'] = html_entity_decode($link['title'],ENT_QUOTES,'UTF-8');
1581                 preg_match_all('! ([A-Z_]+)=\"(.*?)"!i',$html,$matches,PREG_SET_ORDER);  // Get all other attributes
1582                 $raw_add_date=0;
1583                 foreach($matches as $m)
1584                 {
1585                     $attr=$m[1]; $value=$m[2];
1586                     if ($attr=='HREF') $link['url']=html_entity_decode($value,ENT_QUOTES,'UTF-8');
1587                     elseif ($attr=='ADD_DATE')
1588                     {
1589                         $raw_add_date=intval($value);
1590                         if ($raw_add_date>30000000000) $raw_add_date/=1000;     //If larger than year 2920, then was likely stored in milliseconds instead of seconds
1591                     }
1592                     elseif ($attr=='PRIVATE') $link['private']=($value=='0'?0:1);
1593                     elseif ($attr=='TAGS') $link['tags']=html_entity_decode(str_replace(',',' ',$value),ENT_QUOTES,'UTF-8');
1594                 }
1595                 if ($link['url']!='')
1596                 {
1597                     if ($private==1) $link['private']=1;
1598                     $dblink = $LINKSDB->getLinkFromUrl($link['url']); // See if the link is already in database.
1599                     if ($dblink==false)
1600                     {  // Link not in database, let's import it...
1601                        if (empty($raw_add_date)) $raw_add_date=time(); // In case of shitty bookmark file with no ADD_DATE
1602
1603                        // Make sure date/time is not already used by another link.
1604                        // (Some bookmark files have several different links with the same ADD_DATE)
1605                        // We increment date by 1 second until we find a date which is not used in DB.
1606                        // (so that links that have the same date/time are more or less kept grouped by date, but do not conflict.)
1607                        while (!empty($LINKSDB[date('Ymd_His',$raw_add_date)])) { $raw_add_date++; }// Yes, I know it's ugly.
1608                        $link['linkdate']=date('Ymd_His',$raw_add_date);
1609                        $LINKSDB[$link['linkdate']] = $link;
1610                        $import_count++;
1611                     }
1612                     else // Link already present in database.
1613                     {
1614                         if ($overwrite)
1615                         {   // If overwrite is required, we import link data, except date/time.
1616                             $link['linkdate']=$dblink['linkdate'];
1617                             $LINKSDB[$link['linkdate']] = $link;
1618                             $import_count++;
1619                         }
1620                     }
1621
1622                 }
1623             }
1624         }
1625         $LINKSDB->savedb($conf->get('resource.page_cache'));
1626
1627         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) was successfully processed: '.$import_count.' links imported.");document.location=\'?\';</script>';
1628     }
1629     else
1630     {
1631         echo '<script>alert("File '.json_encode($filename).' ('.$filesize.' bytes) has an unknown file format. Nothing was imported.");document.location=\'?\';</script>';
1632     }
1633 }
1634
1635 /**
1636  * Template for the list of links (<div id="linklist">)
1637  * This function fills all the necessary fields in the $PAGE for the template 'linklist.html'
1638  *
1639  * @param pageBuilder   $PAGE          pageBuilder instance.
1640  * @param LinkDB        $LINKSDB       LinkDB instance.
1641  * @param ConfigManager $conf          Configuration Manager instance.
1642  * @param PluginManager $pluginManager Plugin Manager instance.
1643  */
1644 function buildLinkList($PAGE,$LINKSDB, $conf, $pluginManager)
1645 {
1646     // Used in templates
1647     $searchtags = !empty($_GET['searchtags']) ? escape($_GET['searchtags']) : '';
1648     $searchterm = !empty($_GET['searchterm']) ? escape($_GET['searchterm']) : '';
1649
1650     // Smallhash filter
1651     if (! empty($_SERVER['QUERY_STRING'])
1652         && preg_match('/^[a-zA-Z0-9-_@]{6}($|&|#)/', $_SERVER['QUERY_STRING'])) {
1653         try {
1654             $linksToDisplay = $LINKSDB->filterHash($_SERVER['QUERY_STRING']);
1655         } catch (LinkNotFoundException $e) {
1656             $PAGE->render404($e->getMessage());
1657             exit;
1658         }
1659     } else {
1660         // Filter links according search parameters.
1661         $privateonly = !empty($_SESSION['privateonly']);
1662         $linksToDisplay = $LINKSDB->filterSearch($_GET, false, $privateonly);
1663     }
1664
1665     // ---- Handle paging.
1666     $keys = array();
1667     foreach ($linksToDisplay as $key => $value) {
1668         $keys[] = $key;
1669     }
1670
1671
1672
1673     // Select articles according to paging.
1674     $pagecount = ceil(count($keys) / $_SESSION['LINKS_PER_PAGE']);
1675     $pagecount = $pagecount == 0 ? 1 : $pagecount;
1676     $page= empty($_GET['page']) ? 1 : intval($_GET['page']);
1677     $page = $page < 1 ? 1 : $page;
1678     $page = $page > $pagecount ? $pagecount : $page;
1679     // Start index.
1680     $i = ($page-1) * $_SESSION['LINKS_PER_PAGE'];
1681     $end = $i + $_SESSION['LINKS_PER_PAGE'];
1682     $linkDisp = array();
1683     while ($i<$end && $i<count($keys))
1684     {
1685         $link = $linksToDisplay[$keys[$i]];
1686         $link['description'] = format_description($link['description'], $conf->get('redirector.url'));
1687         $classLi =  ($i % 2) != 0 ? '' : 'publicLinkHightLight';
1688         $link['class'] = $link['private'] == 0 ? $classLi : 'private';
1689         $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
1690         $link['timestamp'] = $date->getTimestamp();
1691         $taglist = explode(' ', $link['tags']);
1692         uasort($taglist, 'strcasecmp');
1693         $link['taglist'] = $taglist;
1694         $link['shorturl'] = smallHash($link['linkdate']);
1695         // Check for both signs of a note: starting with ? and 7 chars long.
1696         if ($link['url'][0] === '?' &&
1697             strlen($link['url']) === 7) {
1698             $link['url'] = index_url($_SERVER) . $link['url'];
1699         }
1700
1701         $linkDisp[$keys[$i]] = $link;
1702         $i++;
1703     }
1704
1705     // Compute paging navigation
1706     $searchtagsUrl = empty($searchtags) ? '' : '&searchtags=' . urlencode($searchtags);
1707     $searchtermUrl = empty($searchterm) ? '' : '&searchterm=' . urlencode($searchterm);
1708     $previous_page_url = '';
1709     if ($i != count($keys)) {
1710         $previous_page_url = '?page=' . ($page+1) . $searchtermUrl . $searchtagsUrl;
1711     }
1712     $next_page_url='';
1713     if ($page>1) {
1714         $next_page_url = '?page=' . ($page-1) . $searchtermUrl . $searchtagsUrl;
1715     }
1716
1717     $token = isLoggedIn() ? getToken($conf) : '';
1718
1719     // Fill all template fields.
1720     $data = array(
1721         'previous_page_url' => $previous_page_url,
1722         'next_page_url' => $next_page_url,
1723         'page_current' => $page,
1724         'page_max' => $pagecount,
1725         'result_count' => count($linksToDisplay),
1726         'search_term' => $searchterm,
1727         'search_tags' => $searchtags,
1728         'redirector' => $conf->get('redirector.url'),  // Optional redirector URL.
1729         'links' => $linkDisp,
1730         'tags' => $LINKSDB->allTags(),
1731     );
1732
1733     // If there is only a single link, we change on-the-fly the title of the page.
1734     if (count($linksToDisplay) == 1) {
1735         $data['pagetitle'] = $linksToDisplay[$keys[0]]['title'] .' - '. $conf->get('general.title');
1736     }
1737
1738     $pluginManager->executeHooks('render_linklist', $data, array('loggedin' => isLoggedIn()));
1739
1740     foreach ($data as $key => $value) {
1741         $PAGE->assign($key, $value);
1742     }
1743
1744     return;
1745 }
1746
1747 /**
1748  * Compute the thumbnail for a link.
1749  *
1750  * With a link to the original URL.
1751  * Understands various services (youtube.com...)
1752  * Input: $url = URL for which the thumbnail must be found.
1753  *        $href = if provided, this URL will be followed instead of $url
1754  * Returns an associative array with thumbnail attributes (src,href,width,height,style,alt)
1755  * Some of them may be missing.
1756  * Return an empty array if no thumbnail available.
1757  *
1758  * @param ConfigManager $conf Configuration Manager instance.
1759  * @param string        $url
1760  * @param string|bool   $href
1761  *
1762  * @return array
1763  */
1764 function computeThumbnail($conf, $url, $href = false)
1765 {
1766     if (!$conf->get('thumbnail.enable_thumbnails')) return array();
1767     if ($href==false) $href=$url;
1768
1769     // For most hosts, the URL of the thumbnail can be easily deduced from the URL of the link.
1770     // (e.g. http://www.youtube.com/watch?v=spVypYk4kto --->  http://img.youtube.com/vi/spVypYk4kto/default.jpg )
1771     //                                     ^^^^^^^^^^^                                 ^^^^^^^^^^^
1772     $domain = parse_url($url,PHP_URL_HOST);
1773     if ($domain=='youtube.com' || $domain=='www.youtube.com')
1774     {
1775         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract video ID and get thumbnail
1776         if (!empty($params['v'])) return array('src'=>'https://img.youtube.com/vi/'.$params['v'].'/default.jpg',
1777                                                'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1778     }
1779     if ($domain=='youtu.be') // Youtube short links
1780     {
1781         $path = parse_url($url,PHP_URL_PATH);
1782         return array('src'=>'https://img.youtube.com/vi'.$path.'/default.jpg',
1783                      'href'=>$href,'width'=>'120','height'=>'90','alt'=>'YouTube thumbnail');
1784     }
1785     if ($domain=='pix.toile-libre.org') // pix.toile-libre.org image hosting
1786     {
1787         parse_str(parse_url($url,PHP_URL_QUERY), $params); // Extract image filename.
1788         if (!empty($params) && !empty($params['img'])) return array('src'=>'http://pix.toile-libre.org/upload/thumb/'.urlencode($params['img']),
1789                                                                     'href'=>$href,'style'=>'max-width:120px; max-height:150px','alt'=>'pix.toile-libre.org thumbnail');
1790     }
1791
1792     if ($domain=='imgur.com')
1793     {
1794         $path = parse_url($url,PHP_URL_PATH);
1795         if (startsWith($path,'/a/')) return array(); // Thumbnails for albums are not available.
1796         if (startsWith($path,'/r/')) return array('src'=>'https://i.imgur.com/'.basename($path).'s.jpg',
1797                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1798         if (startsWith($path,'/gallery/')) return array('src'=>'https://i.imgur.com'.substr($path,8).'s.jpg',
1799                                                         'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1800
1801         if (substr_count($path,'/')==1) return array('src'=>'https://i.imgur.com/'.substr($path,1).'s.jpg',
1802                                                      'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1803     }
1804     if ($domain=='i.imgur.com')
1805     {
1806         $pi = pathinfo(parse_url($url,PHP_URL_PATH));
1807         if (!empty($pi['filename'])) return array('src'=>'https://i.imgur.com/'.$pi['filename'].'s.jpg',
1808                                                   'href'=>$href,'width'=>'90','height'=>'90','alt'=>'imgur.com thumbnail');
1809     }
1810     if ($domain=='dailymotion.com' || $domain=='www.dailymotion.com')
1811     {
1812         if (strpos($url,'dailymotion.com/video/')!==false)
1813         {
1814             $thumburl=str_replace('dailymotion.com/video/','dailymotion.com/thumbnail/video/',$url);
1815             return array('src'=>$thumburl,
1816                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'DailyMotion thumbnail');
1817         }
1818     }
1819     if (endsWith($domain,'.imageshack.us'))
1820     {
1821         $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1822         if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1823         {
1824             $thumburl = substr($url,0,strlen($url)-strlen($ext)).'th.'.$ext;
1825             return array('src'=>$thumburl,
1826                          'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'imageshack.us thumbnail');
1827         }
1828     }
1829
1830     // Some other hosts are SLOW AS HELL and usually require an extra HTTP request to get the thumbnail URL.
1831     // So we deport the thumbnail generation in order not to slow down page generation
1832     // (and we also cache the thumbnail)
1833
1834     if (! $conf->get('thumbnail.enable_localcache')) return array(); // If local cache is disabled, no thumbnails for services which require the use a local cache.
1835
1836     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com')
1837         || $domain=='vimeo.com'
1838         || $domain=='ted.com' || endsWith($domain,'.ted.com')
1839         || $domain=='xkcd.com' || endsWith($domain,'.xkcd.com')
1840     )
1841     {
1842         if ($domain=='vimeo.com')
1843         {   // Make sure this vimeo URL points to a video (/xxx... where xxx is numeric)
1844             $path = parse_url($url,PHP_URL_PATH);
1845             if (!preg_match('!/\d+.+?!',$path)) return array(); // This is not a single video URL.
1846         }
1847         if ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
1848         {   // Make sure this URL points to a single comic (/xxx... where xxx is numeric)
1849             $path = parse_url($url,PHP_URL_PATH);
1850             if (!preg_match('!/\d+.+?!',$path)) return array();
1851         }
1852         if ($domain=='ted.com' || endsWith($domain,'.ted.com'))
1853         {   // Make sure this TED URL points to a video (/talks/...)
1854             $path = parse_url($url,PHP_URL_PATH);
1855             if ("/talks/" !== substr($path,0,7)) return array(); // This is not a single video URL.
1856         }
1857         $sign = hash_hmac('sha256', $url, $conf->get('credentials.salt')); // We use the salt to sign data (it's random, secret, and specific to each installation)
1858         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1859                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1860     }
1861
1862     // For all other, we try to make a thumbnail of links ending with .jpg/jpeg/png/gif
1863     // Technically speaking, we should download ALL links and check their Content-Type to see if they are images.
1864     // But using the extension will do.
1865     $ext=strtolower(pathinfo($url,PATHINFO_EXTENSION));
1866     if ($ext=='jpg' || $ext=='jpeg' || $ext=='png' || $ext=='gif')
1867     {
1868         $sign = hash_hmac('sha256', $url, $conf->get('credentials.salt')); // We use the salt to sign data (it's random, secret, and specific to each installation)
1869         return array('src'=>index_url($_SERVER).'?do=genthumbnail&hmac='.$sign.'&url='.urlencode($url),
1870                      'href'=>$href,'width'=>'120','style'=>'height:auto;','alt'=>'thumbnail');
1871     }
1872     return array(); // No thumbnail.
1873
1874 }
1875
1876
1877 // Returns the HTML code to display a thumbnail for a link
1878 // with a link to the original URL.
1879 // Understands various services (youtube.com...)
1880 // Input: $url = URL for which the thumbnail must be found.
1881 //        $href = if provided, this URL will be followed instead of $url
1882 // Returns '' if no thumbnail available.
1883 function thumbnail($url,$href=false)
1884 {
1885     // FIXME!
1886     global $conf;
1887     $t = computeThumbnail($conf, $url,$href);
1888     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1889
1890     $html='<a href="'.escape($t['href']).'"><img src="'.escape($t['src']).'"';
1891     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1892     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1893     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1894     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1895     $html.='></a>';
1896     return $html;
1897 }
1898
1899 // Returns the HTML code to display a thumbnail for a link
1900 // for the picture wall (using lazy image loading)
1901 // Understands various services (youtube.com...)
1902 // Input: $url = URL for which the thumbnail must be found.
1903 //        $href = if provided, this URL will be followed instead of $url
1904 // Returns '' if no thumbnail available.
1905 function lazyThumbnail($conf, $url,$href=false)
1906 {
1907     // FIXME!
1908     global $conf;
1909     $t = computeThumbnail($conf, $url,$href);
1910     if (count($t)==0) return ''; // Empty array = no thumbnail for this URL.
1911
1912     $html='<a href="'.escape($t['href']).'">';
1913
1914     // Lazy image
1915     $html.='<img class="b-lazy" src="#" data-src="'.escape($t['src']).'"';
1916
1917     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1918     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1919     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1920     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1921     $html.='>';
1922
1923     // No-JavaScript fallback.
1924     $html.='<noscript><img src="'.escape($t['src']).'"';
1925     if (!empty($t['width']))  $html.=' width="'.escape($t['width']).'"';
1926     if (!empty($t['height'])) $html.=' height="'.escape($t['height']).'"';
1927     if (!empty($t['style']))  $html.=' style="'.escape($t['style']).'"';
1928     if (!empty($t['alt']))    $html.=' alt="'.escape($t['alt']).'"';
1929     $html.='></noscript></a>';
1930
1931     return $html;
1932 }
1933
1934
1935 /**
1936  * Installation
1937  * This function should NEVER be called if the file data/config.php exists.
1938  *
1939  * @param ConfigManager $conf Configuration Manager instance.
1940  */
1941 function install($conf)
1942 {
1943     // On free.fr host, make sure the /sessions directory exists, otherwise login will not work.
1944     if (endsWith($_SERVER['HTTP_HOST'],'.free.fr') && !is_dir($_SERVER['DOCUMENT_ROOT'].'/sessions')) mkdir($_SERVER['DOCUMENT_ROOT'].'/sessions',0705);
1945
1946
1947     // This part makes sure sessions works correctly.
1948     // (Because on some hosts, session.save_path may not be set correctly,
1949     // or we may not have write access to it.)
1950     if (isset($_GET['test_session']) && ( !isset($_SESSION) || !isset($_SESSION['session_tested']) || $_SESSION['session_tested']!='Working'))
1951     {   // Step 2: Check if data in session is correct.
1952         echo '<pre>Sessions do not seem to work correctly on your server.<br>';
1953         echo 'Make sure the variable session.save_path is set correctly in your php config, and that you have write access to it.<br>';
1954         echo 'It currently points to '.session_save_path().'<br>';
1955         echo 'Check that the hostname used to access Shaarli contains a dot. On some browsers, accessing your server via a hostname like \'localhost\' or any custom hostname without a dot causes cookie storage to fail. We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.<br>';
1956         echo '<br><a href="?">Click to try again.</a></pre>';
1957         die;
1958     }
1959     if (!isset($_SESSION['session_tested']))
1960     {   // Step 1 : Try to store data in session and reload page.
1961         $_SESSION['session_tested'] = 'Working';  // Try to set a variable in session.
1962         header('Location: '.index_url($_SERVER).'?test_session');  // Redirect to check stored data.
1963     }
1964     if (isset($_GET['test_session']))
1965     {   // Step 3: Sessions are OK. Remove test parameter from URL.
1966         header('Location: '.index_url($_SERVER));
1967     }
1968
1969
1970     if (!empty($_POST['setlogin']) && !empty($_POST['setpassword']))
1971     {
1972         $tz = 'UTC';
1973         if (!empty($_POST['continent']) && !empty($_POST['city'])
1974             && isTimeZoneValid($_POST['continent'], $_POST['city'])
1975         ) {
1976             $tz = $_POST['continent'].'/'.$_POST['city'];
1977         }
1978         $conf->set('general.timezone', $tz);
1979         $login = $_POST['setlogin'];
1980         $conf->set('credentials.login', $login);
1981         $salt = sha1(uniqid('', true) .'_'. mt_rand());
1982         $conf->set('credentials.salt', $salt);
1983         $conf->set('credentials.hash', sha1($_POST['setpassword'] . $login . $salt));
1984         if (!empty($_POST['title'])) {
1985             $conf->set('general.title', escape($_POST['title']));
1986         } else {
1987             $conf->set('general.title', 'Shared links on '.escape(index_url($_SERVER)));
1988         }
1989         $conf->set('updates.check_updates', !empty($_POST['updateCheck']));
1990         try {
1991             // Everything is ok, let's create config file.
1992             $conf->write(isLoggedIn());
1993         }
1994         catch(Exception $e) {
1995             error_log(
1996                     'ERROR while writing config file after installation.' . PHP_EOL .
1997                     $e->getMessage()
1998                 );
1999
2000             // TODO: do not handle exceptions/errors in JS.
2001             echo '<script>alert("'. $e->getMessage() .'");document.location=\'?\';</script>';
2002             exit;
2003         }
2004         echo '<script>alert("Shaarli is now configured. Please enter your login/password and start shaaring your links!");document.location=\'?do=login\';</script>';
2005         exit;
2006     }
2007
2008     // Display config form:
2009     list($timezone_form, $timezone_js) = generateTimeZoneForm();
2010     $timezone_html = '';
2011     if ($timezone_form != '') {
2012         $timezone_html = '<tr><td><b>Timezone:</b></td><td>'.$timezone_form.'</td></tr>';
2013     }
2014
2015     $PAGE = new PageBuilder($conf);
2016     $PAGE->assign('timezone_html',$timezone_html);
2017     $PAGE->assign('timezone_js',$timezone_js);
2018     $PAGE->renderPage('install');
2019     exit;
2020 }
2021
2022 /**
2023  * Because some f*cking services like flickr require an extra HTTP request to get the thumbnail URL,
2024  * I have deported the thumbnail URL code generation here, otherwise this would slow down page generation.
2025  * The following function takes the URL a link (e.g. a flickr page) and return the proper thumbnail.
2026  * This function is called by passing the URL:
2027  * http://mywebsite.com/shaarli/?do=genthumbnail&hmac=[HMAC]&url=[URL]
2028  * [URL] is the URL of the link (e.g. a flickr page)
2029  * [HMAC] is the signature for the [URL] (so that these URL cannot be forged).
2030  * The function below will fetch the image from the webservice and store it in the cache.
2031  *
2032  * @param ConfigManager $conf Configuration Manager instance,
2033  */
2034 function genThumbnail($conf)
2035 {
2036     // Make sure the parameters in the URL were generated by us.
2037     $sign = hash_hmac('sha256', $_GET['url'], $conf->get('credentials.salt'));
2038     if ($sign!=$_GET['hmac']) die('Naughty boy!');
2039
2040     $cacheDir = $conf->get('resource.thumbnails_cache', 'cache');
2041     // Let's see if we don't already have the image for this URL in the cache.
2042     $thumbname=hash('sha1',$_GET['url']).'.jpg';
2043     if (is_file($cacheDir .'/'. $thumbname))
2044     {   // We have the thumbnail, just serve it:
2045         header('Content-Type: image/jpeg');
2046         echo file_get_contents($cacheDir .'/'. $thumbname);
2047         return;
2048     }
2049     // We may also serve a blank image (if service did not respond)
2050     $blankname=hash('sha1',$_GET['url']).'.gif';
2051     if (is_file($cacheDir .'/'. $blankname))
2052     {
2053         header('Content-Type: image/gif');
2054         echo file_get_contents($cacheDir .'/'. $blankname);
2055         return;
2056     }
2057
2058     // Otherwise, generate the thumbnail.
2059     $url = $_GET['url'];
2060     $domain = parse_url($url,PHP_URL_HOST);
2061
2062     if ($domain=='flickr.com' || endsWith($domain,'.flickr.com'))
2063     {
2064         // Crude replacement to handle new flickr domain policy (They prefer www. now)
2065         $url = str_replace('http://flickr.com/','http://www.flickr.com/',$url);
2066
2067         // Is this a link to an image, or to a flickr page ?
2068         $imageurl='';
2069         if (endsWith(parse_url($url, PHP_URL_PATH), '.jpg'))
2070         {  // This is a direct link to an image. e.g. http://farm1.staticflickr.com/5/5921913_ac83ed27bd_o.jpg
2071             preg_match('!(http://farm\d+\.staticflickr\.com/\d+/\d+_\w+_)\w.jpg!',$url,$matches);
2072             if (!empty($matches[1])) $imageurl=$matches[1].'m.jpg';
2073         }
2074         else // This is a flickr page (html)
2075         {
2076             // Get the flickr html page.
2077             list($headers, $content) = get_http_response($url, 20);
2078             if (strpos($headers[0], '200 OK') !== false)
2079             {
2080                 // flickr now nicely provides the URL of the thumbnail in each flickr page.
2081                 preg_match('!<link rel=\"image_src\" href=\"(.+?)\"!', $content, $matches);
2082                 if (!empty($matches[1])) $imageurl=$matches[1];
2083
2084                 // In albums (and some other pages), the link rel="image_src" is not provided,
2085                 // but flickr provides:
2086                 // <meta property="og:image" content="http://farm4.staticflickr.com/3398/3239339068_25d13535ff_z.jpg" />
2087                 if ($imageurl=='')
2088                 {
2089                     preg_match('!<meta property=\"og:image\" content=\"(.+?)\"!', $content, $matches);
2090                     if (!empty($matches[1])) $imageurl=$matches[1];
2091                 }
2092             }
2093         }
2094
2095         if ($imageurl!='')
2096         {   // Let's download the image.
2097             // Image is 240x120, so 10 seconds to download should be enough.
2098             list($headers, $content) = get_http_response($imageurl, 10);
2099             if (strpos($headers[0], '200 OK') !== false) {
2100                 // Save image to cache.
2101                 file_put_contents($cacheDir .'/'. $thumbname, $content);
2102                 header('Content-Type: image/jpeg');
2103                 echo $content;
2104                 return;
2105             }
2106         }
2107     }
2108
2109     elseif ($domain=='vimeo.com' )
2110     {
2111         // This is more complex: we have to perform a HTTP request, then parse the result.
2112         // Maybe we should deport this to JavaScript ? Example: http://stackoverflow.com/questions/1361149/get-img-thumbnails-from-vimeo/4285098#4285098
2113         $vid = substr(parse_url($url,PHP_URL_PATH),1);
2114         list($headers, $content) = get_http_response('https://vimeo.com/api/v2/video/'.escape($vid).'.php', 5);
2115         if (strpos($headers[0], '200 OK') !== false) {
2116             $t = unserialize($content);
2117             $imageurl = $t[0]['thumbnail_medium'];
2118             // Then we download the image and serve it to our client.
2119             list($headers, $content) = get_http_response($imageurl, 10);
2120             if (strpos($headers[0], '200 OK') !== false) {
2121                 // Save image to cache.
2122                 file_put_contents($cacheDir .'/'. $thumbname, $content);
2123                 header('Content-Type: image/jpeg');
2124                 echo $content;
2125                 return;
2126             }
2127         }
2128     }
2129
2130     elseif ($domain=='ted.com' || endsWith($domain,'.ted.com'))
2131     {
2132         // The thumbnail for TED talks is located in the <link rel="image_src" [...]> tag on that page
2133         // http://www.ted.com/talks/mikko_hypponen_fighting_viruses_defending_the_net.html
2134         // <link rel="image_src" href="http://images.ted.com/images/ted/28bced335898ba54d4441809c5b1112ffaf36781_389x292.jpg" />
2135         list($headers, $content) = get_http_response($url, 5);
2136         if (strpos($headers[0], '200 OK') !== false) {
2137             // Extract the link to the thumbnail
2138             preg_match('!link rel="image_src" href="(http://images.ted.com/images/ted/.+_\d+x\d+\.jpg)"!', $content, $matches);
2139             if (!empty($matches[1]))
2140             {   // Let's download the image.
2141                 $imageurl=$matches[1];
2142                 // No control on image size, so wait long enough
2143                 list($headers, $content) = get_http_response($imageurl, 20);
2144                 if (strpos($headers[0], '200 OK') !== false) {
2145                     $filepath = $cacheDir .'/'. $thumbname;
2146                     file_put_contents($filepath, $content); // Save image to cache.
2147                     if (resizeImage($filepath))
2148                     {
2149                         header('Content-Type: image/jpeg');
2150                         echo file_get_contents($filepath);
2151                         return;
2152                     }
2153                 }
2154             }
2155         }
2156     }
2157
2158     elseif ($domain=='xkcd.com' || endsWith($domain,'.xkcd.com'))
2159     {
2160         // There is no thumbnail available for xkcd comics, so download the whole image and resize it.
2161         // http://xkcd.com/327/
2162         // <img src="http://imgs.xkcd.com/comics/exploits_of_a_mom.png" title="<BLABLA>" alt="<BLABLA>" />
2163         list($headers, $content) = get_http_response($url, 5);
2164         if (strpos($headers[0], '200 OK') !== false) {
2165             // Extract the link to the thumbnail
2166             preg_match('!<img src="(http://imgs.xkcd.com/comics/.*)" title="[^s]!', $content, $matches);
2167             if (!empty($matches[1]))
2168             {   // Let's download the image.
2169                 $imageurl=$matches[1];
2170                 // No control on image size, so wait long enough
2171                 list($headers, $content) = get_http_response($imageurl, 20);
2172                 if (strpos($headers[0], '200 OK') !== false) {
2173                     $filepath = $cacheDir.'/'.$thumbname;
2174                     // Save image to cache.
2175                     file_put_contents($filepath, $content);
2176                     if (resizeImage($filepath))
2177                     {
2178                         header('Content-Type: image/jpeg');
2179                         echo file_get_contents($filepath);
2180                         return;
2181                     }
2182                 }
2183             }
2184         }
2185     }
2186
2187     else
2188     {
2189         // For all other domains, we try to download the image and make a thumbnail.
2190         // We allow 30 seconds max to download (and downloads are limited to 4 Mb)
2191         list($headers, $content) = get_http_response($url, 30);
2192         if (strpos($headers[0], '200 OK') !== false) {
2193             $filepath = $cacheDir .'/'.$thumbname;
2194             // Save image to cache.
2195             file_put_contents($filepath, $content);
2196             if (resizeImage($filepath))
2197             {
2198                 header('Content-Type: image/jpeg');
2199                 echo file_get_contents($filepath);
2200                 return;
2201             }
2202         }
2203     }
2204
2205
2206     // Otherwise, return an empty image (8x8 transparent gif)
2207     $blankgif = base64_decode('R0lGODlhCAAIAIAAAP///////yH5BAEKAAEALAAAAAAIAAgAAAIHjI+py+1dAAA7');
2208     // Also put something in cache so that this URL is not requested twice.
2209     file_put_contents($cacheDir .'/'. $blankname, $blankgif);
2210     header('Content-Type: image/gif');
2211     echo $blankgif;
2212 }
2213
2214 // Make a thumbnail of the image (to width: 120 pixels)
2215 // Returns true if success, false otherwise.
2216 function resizeImage($filepath)
2217 {
2218     if (!function_exists('imagecreatefromjpeg')) return false; // GD not present: no thumbnail possible.
2219
2220     // Trick: some stupid people rename GIF as JPEG... or else.
2221     // So we really try to open each image type whatever the extension is.
2222     $header=file_get_contents($filepath,false,NULL,0,256); // Read first 256 bytes and try to sniff file type.
2223     $im=false;
2224     $i=strpos($header,'GIF8'); if (($i!==false) && ($i==0)) $im = imagecreatefromgif($filepath); // Well this is crude, but it should be enough.
2225     $i=strpos($header,'PNG'); if (($i!==false) && ($i==1)) $im = imagecreatefrompng($filepath);
2226     $i=strpos($header,'JFIF'); if ($i!==false) $im = imagecreatefromjpeg($filepath);
2227     if (!$im) return false;  // Unable to open image (corrupted or not an image)
2228     $w = imagesx($im);
2229     $h = imagesy($im);
2230     $ystart = 0; $yheight=$h;
2231     if ($h>$w) { $ystart= ($h/2)-($w/2); $yheight=$w/2; }
2232     $nw = 120;   // Desired width
2233     $nh = min(floor(($h*$nw)/$w),120); // Compute new width/height, but maximum 120 pixels height.
2234     // Resize image:
2235     $im2 = imagecreatetruecolor($nw,$nh);
2236     imagecopyresampled($im2, $im, 0, 0, 0, $ystart, $nw, $nh, $w, $yheight);
2237     imageinterlace($im2,true); // For progressive JPEG.
2238     $tempname=$filepath.'_TEMP.jpg';
2239     imagejpeg($im2, $tempname, 90);
2240     imagedestroy($im);
2241     imagedestroy($im2);
2242     unlink($filepath);
2243     rename($tempname,$filepath);  // Overwrite original picture with thumbnail.
2244     return true;
2245 }
2246
2247 if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=genthumbnail')) { genThumbnail($conf); exit; }  // Thumbnail generation/cache does not need the link database.
2248 if (isset($_SERVER['QUERY_STRING']) && startsWith($_SERVER['QUERY_STRING'], 'do=dailyrss')) { showDailyRSS($conf); exit; }
2249 if (!isset($_SESSION['LINKS_PER_PAGE'])) {
2250     $_SESSION['LINKS_PER_PAGE'] = $conf->get('general.links_per_page', 20);
2251 }
2252 renderPage($conf, $pluginManager);